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Diffstat (limited to 'src/gui/painting/qpainter.cpp')
| -rw-r--r-- | src/gui/painting/qpainter.cpp | 8526 |
1 files changed, 8526 insertions, 0 deletions
diff --git a/src/gui/painting/qpainter.cpp b/src/gui/painting/qpainter.cpp new file mode 100644 index 0000000..1f61e2f --- /dev/null +++ b/src/gui/painting/qpainter.cpp @@ -0,0 +1,8526 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (qt-info@nokia.com) +** +** This file is part of the QtGui module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain +** additional rights. These rights are described in the Nokia Qt LGPL +** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this +** package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ +// QtCore +#include <qdebug.h> +#include <qmath.h> +#include <qmutex.h> + +// QtGui +#include "qbitmap.h" +#include "qimage.h" +#include "qpaintdevice.h" +#include "qpaintengine.h" +#include "qpainter.h" +#include "qpainter_p.h" +#include "qpainterpath.h" +#include "qpicture.h" +#include "qpixmapcache.h" +#include "qpolygon.h" +#include "qtextlayout.h" +#include "qwidget.h" +#include "qapplication.h" +#include "qstyle.h" +#include "qthread.h" +#include "qvarlengtharray.h" + +#include <private/qfontengine_p.h> +#include <private/qpaintengine_p.h> +#include <private/qemulationpaintengine_p.h> +#include <private/qpainterpath_p.h> +#include <private/qtextengine_p.h> +#include <private/qwidget_p.h> +#include <private/qpaintengine_raster_p.h> +#include <private/qmath_p.h> + +QT_BEGIN_NAMESPACE + +#define QGradient_StretchToDevice 0x10000000 +#define QPaintEngine_OpaqueBackground 0x40000000 + +// use the same rounding as in qrasterizer.cpp (6 bit fixed point) +static const qreal aliasedCoordinateDelta = 0.5 - 0.015625; + +// #define QT_DEBUG_DRAW +#ifdef QT_DEBUG_DRAW +bool qt_show_painter_debug_output = true; +#endif + +extern QPixmap qt_pixmapForBrush(int style, bool invert); + +void qt_format_text(const QFont &font, + const QRectF &_r, int tf, const QTextOption *option, const QString& str, QRectF *brect, + int tabstops, int* tabarray, int tabarraylen, + QPainter *painter); + +static inline QGradient::CoordinateMode coordinateMode(const QBrush &brush) +{ + switch (brush.style()) { + case Qt::LinearGradientPattern: + case Qt::RadialGradientPattern: + case Qt::ConicalGradientPattern: + return brush.gradient()->coordinateMode(); + default: + ; + } + return QGradient::LogicalMode; +} + +/* Returns true if the gradient requires stretch to device...*/ +static inline bool check_gradient(const QBrush &brush) +{ + return coordinateMode(brush) == QGradient::StretchToDeviceMode; +} + +extern bool qHasPixmapTexture(const QBrush &); + +static inline bool is_brush_transparent(const QBrush &brush) { + Qt::BrushStyle s = brush.style(); + bool brushBitmap = qHasPixmapTexture(brush) + ? brush.texture().isQBitmap() + : (brush.textureImage().depth() == 1); + return ((s >= Qt::Dense1Pattern && s <= Qt::DiagCrossPattern) + || (s == Qt::TexturePattern && brushBitmap)); +} + +static inline bool is_pen_transparent(const QPen &pen) { + return pen.style() > Qt::SolidLine || is_brush_transparent(pen.brush()); +} + +/* Discards the emulation flags that are not relevant for line drawing + and returns the result +*/ +static inline uint line_emulation(uint emulation) +{ + return emulation & (QPaintEngine::PrimitiveTransform + | QPaintEngine::AlphaBlend + | QPaintEngine::Antialiasing + | QPaintEngine::BrushStroke + | QPaintEngine::ConstantOpacity + | QGradient_StretchToDevice + | QPaintEngine::ObjectBoundingModeGradients + | QPaintEngine_OpaqueBackground); +} + +#ifndef QT_NO_DEBUG +static bool qt_painter_thread_test(int devType, const char *what, bool extraCondition = false) +{ + switch (devType) { + case QInternal::Image: + case QInternal::Printer: + case QInternal::Picture: + // can be drawn onto these devices safely from any thread +#ifndef Q_WS_WIN + if (extraCondition) +#endif + break; + default: + if (!extraCondition && QThread::currentThread() != qApp->thread()) { + qWarning("QPainter: It is not safe to use %s outside the GUI thread", what); + return false; + } + break; + } + return true; +} +#endif + +void QPainterPrivate::checkEmulation() +{ + Q_ASSERT(extended); + bool doEmulation = false; + if (state->bgMode == Qt::OpaqueMode) + doEmulation = true; + + const QGradient *bg = state->brush.gradient(); + if (bg && bg->coordinateMode() > QGradient::LogicalMode) + doEmulation = true; + + const QGradient *pg = qpen_brush(state->pen).gradient(); + if (pg && pg->coordinateMode() > QGradient::LogicalMode) + doEmulation = true; + + if (doEmulation) { + if (extended != emulationEngine) { + if (!emulationEngine) + emulationEngine = new QEmulationPaintEngine(extended); + extended = emulationEngine; + extended->setState(state); + } + } else if (emulationEngine && emulationEngine != extended) { + extended = emulationEngine->real_engine; + } +} + + +QPainterPrivate::~QPainterPrivate() +{ + delete emulationEngine; + for (int i=0; i<states.size(); ++i) + delete states.at(i); + + if (dummyState) + delete dummyState; +} + + +QTransform QPainterPrivate::viewTransform() const +{ + if (state->VxF) { + qreal scaleW = qreal(state->vw)/qreal(state->ww); + qreal scaleH = qreal(state->vh)/qreal(state->wh); + return QTransform(scaleW, 0, 0, scaleH, + state->vx - state->wx*scaleW, state->vy - state->wy*scaleH); + } + return QTransform(); +} + + +/* + \internal + Returns true if using a shared painter; otherwise false. +*/ +bool QPainterPrivate::attachPainterPrivate(QPainter *q, QPaintDevice *pdev) +{ + Q_ASSERT(q); + Q_ASSERT(pdev); + + if (pdev->devType() != QInternal::Widget) + return false; + + QWidget *widget = static_cast<QWidget *>(pdev); + Q_ASSERT(widget); + + // Someone either called QPainter::setRedirected in the widget's paint event + // right before this painter was created (or begin was called) or + // sent a paint event directly to the widget. + if (!widget->d_func()->redirectDev) + return false; + + QPainter *sp = widget->d_func()->sharedPainter(); + if (!sp || !sp->isActive()) + return false; + + if (sp->paintEngine()->paintDevice() != widget->d_func()->redirectDev) + return false; + + // Check if we're attempting to paint outside a paint event. + if (!sp->d_ptr->engine->hasFeature(QPaintEngine::PaintOutsidePaintEvent) + && !widget->testAttribute(Qt::WA_PaintOutsidePaintEvent) + && !widget->testAttribute(Qt::WA_WState_InPaintEvent)) { + + qWarning("QPainter::begin: Widget painting can only begin as a result of a paintEvent"); + return false; + } + + // Save the current state of the shared painter and assign + // the current d_ptr to the shared painter's d_ptr. + sp->save(); + if (!sp->d_ptr->d_ptrs) { + // Allocate space for 4 d-pointers (enough for up to 4 sub-sequent + // redirections within the same paintEvent(), which should be enough + // in 99% of all cases). E.g: A renders B which renders C which renders D. + sp->d_ptr->d_ptrs_size = 4; + sp->d_ptr->d_ptrs = (QPainterPrivate **)malloc(4 * sizeof(QPainterPrivate *)); + } else if (sp->d_ptr->refcount - 1 == sp->d_ptr->d_ptrs_size) { + // However, to support corner cases we grow the array dynamically if needed. + sp->d_ptr->d_ptrs_size <<= 1; + const int newSize = sp->d_ptr->d_ptrs_size * sizeof(QPainterPrivate *); + sp->d_ptr->d_ptrs = (QPainterPrivate **)realloc(sp->d_ptr->d_ptrs, newSize); + } + sp->d_ptr->d_ptrs[++sp->d_ptr->refcount - 2] = q->d_ptr; + q->d_ptr = sp->d_ptr; + + Q_ASSERT(q->d_ptr->state); + + // Now initialize the painter with correct widget properties. + q->initFrom(widget); + QPoint offset; + widget->d_func()->redirected(&offset); + offset += q->d_ptr->engine->coordinateOffset(); + + // Update system rect. + q->d_ptr->state->ww = q->d_ptr->state->vw = widget->width(); + q->d_ptr->state->wh = q->d_ptr->state->vh = widget->height(); + + // Update matrix. + if (q->d_ptr->state->WxF) + q->d_ptr->state->worldMatrix.translate(-offset.x(), -offset.y()); + else + q->d_ptr->state->redirection_offset = offset; + q->d_ptr->updateMatrix(); + + QPaintEnginePrivate *enginePrivate = q->d_ptr->engine->d_func(); + if (enginePrivate->currentClipWidget == widget) { + enginePrivate->systemStateChanged(); + return true; + } + + // Update system transform and clip. + enginePrivate->currentClipWidget = widget; + enginePrivate->setSystemTransform(q->d_ptr->state->matrix); + return true; +} + +void QPainterPrivate::detachPainterPrivate(QPainter *q) +{ + Q_ASSERT(refcount > 1); + Q_ASSERT(q); + + QPainterPrivate *original = d_ptrs[--refcount - 1]; + if (inDestructor) { + inDestructor = false; + if (original) + original->inDestructor = true; + } else if (!original) { + original = new QPainterPrivate(q); + } + + d_ptrs[refcount - 1] = 0; + q->restore(); + q->d_ptr = original; + + if (emulationEngine) { + extended = emulationEngine->real_engine; + delete emulationEngine; + emulationEngine = 0; + } +} + + +void QPainterPrivate::draw_helper(const QPainterPath &originalPath, DrawOperation op) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) { + printf("QPainter::drawHelper\n"); + } +#endif + + if (originalPath.isEmpty()) + return; + + QPaintEngine::PaintEngineFeatures gradientStretch = + QPaintEngine::PaintEngineFeatures(QGradient_StretchToDevice + | QPaintEngine::ObjectBoundingModeGradients); + + const bool mustEmulateObjectBoundingModeGradients = extended + || ((state->emulationSpecifier & QPaintEngine::ObjectBoundingModeGradients) + && !engine->hasFeature(QPaintEngine::PatternTransform)); + + if (!(state->emulationSpecifier & ~gradientStretch) + && !mustEmulateObjectBoundingModeGradients) { + drawStretchedGradient(originalPath, op); + return; + } else if (state->emulationSpecifier & QPaintEngine_OpaqueBackground) { + drawOpaqueBackground(originalPath, op); + return; + } + + Q_Q(QPainter); + + qreal strokeOffsetX = 0, strokeOffsetY = 0; + + QPainterPath path = originalPath * state->matrix; + QRectF pathBounds = path.boundingRect(); + QRectF strokeBounds; + bool doStroke = (op & StrokeDraw) && (state->pen.style() != Qt::NoPen); + if (doStroke) { + qreal penWidth = state->pen.widthF(); + if (penWidth == 0) { + strokeOffsetX = 1; + strokeOffsetY = 1; + } else { + // In case of complex xform + if (state->matrix.type() > QTransform::TxScale) { + QPainterPathStroker stroker; + stroker.setWidth(penWidth); + stroker.setJoinStyle(state->pen.joinStyle()); + stroker.setCapStyle(state->pen.capStyle()); + QPainterPath stroke = stroker.createStroke(originalPath); + strokeBounds = (stroke * state->matrix).boundingRect(); + } else { + strokeOffsetX = qAbs(penWidth * state->matrix.m11() / 2.0); + strokeOffsetY = qAbs(penWidth * state->matrix.m22() / 2.0); + } + } + } + + QRect absPathRect; + if (!strokeBounds.isEmpty()) { + absPathRect = strokeBounds.intersected(QRectF(0, 0, device->width(), device->height())).toAlignedRect(); + } else { + absPathRect = pathBounds.adjusted(-strokeOffsetX, -strokeOffsetY, strokeOffsetX, strokeOffsetY) + .intersected(QRectF(0, 0, device->width(), device->height())).toAlignedRect(); + } + + if (q->hasClipping()) { + bool hasPerspectiveTransform = false; + for (int i = 0; i < state->clipInfo.size(); ++i) { + const QPainterClipInfo &info = state->clipInfo.at(i); + if (info.matrix.type() == QTransform::TxProject) { + hasPerspectiveTransform = true; + break; + } + } + // avoid mapping QRegions with perspective transforms + if (!hasPerspectiveTransform) { + // The trick with txinv and invMatrix is done in order to + // avoid transforming the clip to logical coordinates, and + // then back to device coordinates. This is a problem with + // QRegion/QRect based clips, since they use integer + // coordinates and converting to/from logical coordinates will + // lose precision. + bool old_txinv = txinv; + QTransform old_invMatrix = invMatrix; + txinv = true; + invMatrix = QTransform().translate(-state->redirection_offset.x(), -state->redirection_offset.y()); + QPainterPath clipPath = q->clipPath(); + QRectF r = clipPath.boundingRect().intersected(absPathRect); + absPathRect = r.toAlignedRect(); + txinv = old_txinv; + invMatrix = old_invMatrix; + } + } + +// qDebug("\nQPainterPrivate::draw_helper(), x=%d, y=%d, w=%d, h=%d", +// devMinX, devMinY, device->width(), device->height()); +// qDebug() << " - matrix" << state->matrix; +// qDebug() << " - originalPath.bounds" << originalPath.boundingRect(); +// qDebug() << " - path.bounds" << path.boundingRect(); + + if (absPathRect.width() <= 0 || absPathRect.height() <= 0) + return; + + QImage image(absPathRect.width(), absPathRect.height(), QImage::Format_ARGB32_Premultiplied); + image.fill(0); + + QPainter p(&image); + + p.d_ptr->helper_device = helper_device; + + p.setOpacity(state->opacity); + p.translate(-absPathRect.x(), -absPathRect.y()); + p.setTransform(state->matrix, true); + p.setPen(doStroke ? state->pen : QPen(Qt::NoPen)); + p.setBrush((op & FillDraw) ? state->brush : QBrush(Qt::NoBrush)); + p.setBackground(state->bgBrush); + p.setBackgroundMode(state->bgMode); + p.setBrushOrigin(state->brushOrigin); + + p.setRenderHint(QPainter::Antialiasing, state->renderHints & QPainter::Antialiasing); + p.setRenderHint(QPainter::SmoothPixmapTransform, + state->renderHints & QPainter::SmoothPixmapTransform); + + p.drawPath(originalPath); + +#ifndef QT_NO_DEBUG + static bool do_fallback_overlay = qgetenv("QT_PAINT_FALLBACK_OVERLAY").size() > 0; + if (do_fallback_overlay) { + QImage block(8, 8, QImage::Format_ARGB32_Premultiplied); + QPainter pt(&block); + pt.fillRect(0, 0, 8, 8, QColor(196, 0, 196)); + pt.drawLine(0, 0, 8, 8); + pt.end(); + p.resetTransform(); + p.setCompositionMode(QPainter::CompositionMode_SourceAtop); + p.setOpacity(0.5); + p.fillRect(0, 0, image.width(), image.height(), QBrush(block)); + } +#endif + + p.end(); + + q->save(); + q->resetMatrix(); + updateState(state); + engine->drawImage(absPathRect, + image, + QRectF(0, 0, absPathRect.width(), absPathRect.height()), + Qt::OrderedDither | Qt::OrderedAlphaDither); + q->restore(); +} + +void QPainterPrivate::drawOpaqueBackground(const QPainterPath &path, DrawOperation op) +{ + Q_Q(QPainter); + + q->setBackgroundMode(Qt::TransparentMode); + + if (op & FillDraw && state->brush.style() != Qt::NoBrush) { + q->fillPath(path, state->bgBrush.color()); + q->fillPath(path, state->brush); + } + + if (op & StrokeDraw && state->pen.style() != Qt::NoPen) { + q->strokePath(path, QPen(state->bgBrush.color(), state->pen.width())); + q->strokePath(path, state->pen); + } + + q->setBackgroundMode(Qt::OpaqueMode); +} + +static inline QBrush stretchGradientToUserSpace(const QBrush &brush, const QRectF &boundingRect) +{ + Q_ASSERT(brush.style() >= Qt::LinearGradientPattern + && brush.style() <= Qt::ConicalGradientPattern); + + QTransform gradientToUser(boundingRect.width(), 0, 0, boundingRect.height(), + boundingRect.x(), boundingRect.y()); + + QGradient g = *brush.gradient(); + g.setCoordinateMode(QGradient::LogicalMode); + + QBrush b(g); + b.setTransform(gradientToUser * b.transform()); + return b; +} + +void QPainterPrivate::drawStretchedGradient(const QPainterPath &path, DrawOperation op) +{ + Q_Q(QPainter); + + const qreal sw = helper_device->width(); + const qreal sh = helper_device->height(); + + bool changedPen = false; + bool changedBrush = false; + bool needsFill = false; + + const QPen pen = state->pen; + const QBrush brush = state->brush; + + const QGradient::CoordinateMode penMode = coordinateMode(pen.brush()); + const QGradient::CoordinateMode brushMode = coordinateMode(brush); + + QRectF boundingRect; + + // Draw the xformed fill if the brush is a stretch gradient. + if ((op & FillDraw) && brush.style() != Qt::NoBrush) { + if (brushMode == QGradient::StretchToDeviceMode) { + q->setPen(Qt::NoPen); + changedPen = pen.style() != Qt::NoPen; + q->scale(sw, sh); + updateState(state); + + const qreal isw = 1.0 / sw; + const qreal ish = 1.0 / sh; + QTransform inv(isw, 0, 0, ish, 0, 0); + engine->drawPath(path * inv); + q->scale(isw, ish); + } else { + needsFill = true; + + if (brushMode == QGradient::ObjectBoundingMode) { + Q_ASSERT(engine->hasFeature(QPaintEngine::PatternTransform)); + boundingRect = path.boundingRect(); + q->setBrush(stretchGradientToUserSpace(brush, boundingRect)); + changedBrush = true; + } + } + } + + if ((op & StrokeDraw) && pen.style() != Qt::NoPen) { + // Draw the xformed outline if the pen is a stretch gradient. + if (penMode == QGradient::StretchToDeviceMode) { + q->setPen(Qt::NoPen); + changedPen = true; + + if (needsFill) { + updateState(state); + engine->drawPath(path); + } + + q->scale(sw, sh); + q->setBrush(pen.brush()); + changedBrush = true; + updateState(state); + + QPainterPathStroker stroker; + stroker.setDashPattern(pen.style()); + stroker.setWidth(pen.widthF()); + stroker.setJoinStyle(pen.joinStyle()); + stroker.setCapStyle(pen.capStyle()); + stroker.setMiterLimit(pen.miterLimit()); + QPainterPath stroke = stroker.createStroke(path); + + const qreal isw = 1.0 / sw; + const qreal ish = 1.0 / sh; + QTransform inv(isw, 0, 0, ish, 0, 0); + engine->drawPath(stroke * inv); + q->scale(isw, ish); + } else { + if (!needsFill && brush.style() != Qt::NoBrush) { + q->setBrush(Qt::NoBrush); + changedBrush = true; + } + + if (penMode == QGradient::ObjectBoundingMode) { + Q_ASSERT(engine->hasFeature(QPaintEngine::PatternTransform)); + + // avoid computing the bounding rect twice + if (!needsFill || brushMode != QGradient::ObjectBoundingMode) + boundingRect = path.boundingRect(); + + QPen p = pen; + p.setBrush(stretchGradientToUserSpace(pen.brush(), boundingRect)); + q->setPen(p); + changedPen = true; + } else if (changedPen) { + q->setPen(pen); + changedPen = false; + } + + updateState(state); + engine->drawPath(path); + } + } else if (needsFill) { + if (pen.style() != Qt::NoPen) { + q->setPen(Qt::NoPen); + changedPen = true; + } + + updateState(state); + engine->drawPath(path); + } + + if (changedPen) + q->setPen(pen); + if (changedBrush) + q->setBrush(brush); +} + + +void QPainterPrivate::updateMatrix() +{ + state->matrix = state->WxF ? state->worldMatrix : QTransform(); + if (state->VxF) + state->matrix *= viewTransform(); + + txinv = false; // no inverted matrix + if (!state->redirection_offset.isNull()) { + // We want to translate in dev space so we do the adding of the redirection + // offset manually. + if (state->matrix.isAffine()) { + state->matrix = QTransform(state->matrix.m11(), state->matrix.m12(), + state->matrix.m21(), state->matrix.m22(), + state->matrix.dx()-state->redirection_offset.x(), + state->matrix.dy()-state->redirection_offset.y()); + } else { + QTransform temp; + temp.translate(-state->redirection_offset.x(), -state->redirection_offset.y()); + state->matrix *= temp; + } + } + if (extended) + extended->transformChanged(); + else + state->dirtyFlags |= QPaintEngine::DirtyTransform; + +// printf("VxF=%d, WxF=%d\n", state->VxF, state->WxF); +// qDebug() << " --- using matrix" << state->matrix << redirection_offset; +} + +/*! \internal */ +void QPainterPrivate::updateInvMatrix() +{ + Q_ASSERT(txinv == false); + txinv = true; // creating inverted matrix + QTransform m; + + if (state->VxF) + m = viewTransform(); + + if (state->WxF) { + if (state->VxF) + m = state->worldMatrix * m; + else + m = state->worldMatrix; + } + invMatrix = m.inverted(); // invert matrix +} + +void QPainterPrivate::updateEmulationSpecifier(QPainterState *s) +{ + bool alpha = false; + bool linearGradient = false; + bool radialGradient = false; + bool conicalGradient = false; + bool patternBrush = false; + bool xform = false; + bool complexXform = false; + + bool skip = true; + + // Pen and brush properties (we have to check both if one changes because the + // one that's unchanged can still be in a state which requires emulation) + if (s->state() & (QPaintEngine::DirtyPen | QPaintEngine::DirtyBrush | QPaintEngine::DirtyHints)) { + // Check Brush stroke emulation + if (!s->pen.isSolid() && !engine->hasFeature(QPaintEngine::BrushStroke)) + s->emulationSpecifier |= QPaintEngine::BrushStroke; + else + s->emulationSpecifier &= ~QPaintEngine::BrushStroke; + + skip = false; + + QBrush penBrush = s->pen.brush(); + Qt::BrushStyle brushStyle = s->brush.style(); + Qt::BrushStyle penBrushStyle = penBrush.style(); + alpha = (penBrushStyle != Qt::NoBrush + && (penBrushStyle < Qt::LinearGradientPattern && penBrush.color().alpha() != 255) + && !penBrush.isOpaque()) + || (brushStyle != Qt::NoBrush + && (brushStyle < Qt::LinearGradientPattern && s->brush.color().alpha() != 255) + && !s->brush.isOpaque()); + linearGradient = ((penBrushStyle == Qt::LinearGradientPattern) || + (brushStyle == Qt::LinearGradientPattern)); + radialGradient = ((penBrushStyle == Qt::RadialGradientPattern) || + (brushStyle == Qt::RadialGradientPattern)); + conicalGradient = ((penBrushStyle == Qt::ConicalGradientPattern) || + (brushStyle == Qt::ConicalGradientPattern)); + patternBrush = (((penBrushStyle > Qt::SolidPattern + && penBrushStyle < Qt::LinearGradientPattern) + || penBrushStyle == Qt::TexturePattern) || + ((brushStyle > Qt::SolidPattern + && brushStyle < Qt::LinearGradientPattern) + || brushStyle == Qt::TexturePattern)); + + bool penTextureAlpha = false; + if (penBrush.style() == Qt::TexturePattern) + penTextureAlpha = qHasPixmapTexture(penBrush) + ? penBrush.texture().hasAlpha() + : penBrush.textureImage().hasAlphaChannel(); + bool brushTextureAlpha = false; + if (s->brush.style() == Qt::TexturePattern) + brushTextureAlpha = qHasPixmapTexture(s->brush) + ? s->brush.texture().hasAlpha() + : s->brush.textureImage().hasAlphaChannel(); + if (((penBrush.style() == Qt::TexturePattern && penTextureAlpha) + || (s->brush.style() == Qt::TexturePattern && brushTextureAlpha)) + && !engine->hasFeature(QPaintEngine::MaskedBrush)) + s->emulationSpecifier |= QPaintEngine::MaskedBrush; + else + s->emulationSpecifier &= ~QPaintEngine::MaskedBrush; + } + + if (s->state() & (QPaintEngine::DirtyHints + | QPaintEngine::DirtyOpacity + | QPaintEngine::DirtyBackgroundMode)) { + skip = false; + } + + if (skip) + return; + +#if 0 + qDebug("QPainterPrivate::updateEmulationSpecifier, state=%p\n" + " - alpha: %d\n" + " - linearGradient: %d\n" + " - radialGradient: %d\n" + " - conicalGradient: %d\n" + " - patternBrush: %d\n" + " - hints: %x\n" + " - xform: %d\n", + s, + alpha, + linearGradient, + radialGradient, + conicalGradient, + patternBrush, + uint(s->renderHints), + xform); +#endif + + // XForm properties + if (s->state() & QPaintEngine::DirtyTransform) { + xform = !s->matrix.isIdentity(); + complexXform = !s->matrix.isAffine(); + } else if (s->matrix.type() >= QTransform::TxTranslate) { + xform = true; + complexXform = !s->matrix.isAffine(); + } + + const bool brushXform = (!s->brush.transform().type() == QTransform::TxNone); + const bool penXform = (!s->pen.brush().transform().type() == QTransform::TxNone); + + const bool patternXform = patternBrush && (xform || brushXform || penXform); + + // Check alphablending + if (alpha && !engine->hasFeature(QPaintEngine::AlphaBlend)) + s->emulationSpecifier |= QPaintEngine::AlphaBlend; + else + s->emulationSpecifier &= ~QPaintEngine::AlphaBlend; + + // Linear gradient emulation + if (linearGradient && !engine->hasFeature(QPaintEngine::LinearGradientFill)) + s->emulationSpecifier |= QPaintEngine::LinearGradientFill; + else + s->emulationSpecifier &= ~QPaintEngine::LinearGradientFill; + + // Radial gradient emulation + if (radialGradient && !engine->hasFeature(QPaintEngine::RadialGradientFill)) + s->emulationSpecifier |= QPaintEngine::RadialGradientFill; + else + s->emulationSpecifier &= ~QPaintEngine::RadialGradientFill; + + // Conical gradient emulation + if (conicalGradient && !engine->hasFeature(QPaintEngine::ConicalGradientFill)) + s->emulationSpecifier |= QPaintEngine::ConicalGradientFill; + else + s->emulationSpecifier &= ~QPaintEngine::ConicalGradientFill; + + // Pattern brushes + if (patternBrush && !engine->hasFeature(QPaintEngine::PatternBrush)) + s->emulationSpecifier |= QPaintEngine::PatternBrush; + else + s->emulationSpecifier &= ~QPaintEngine::PatternBrush; + + // Pattern XForms + if (patternXform && !engine->hasFeature(QPaintEngine::PatternTransform)) + s->emulationSpecifier |= QPaintEngine::PatternTransform; + else + s->emulationSpecifier &= ~QPaintEngine::PatternTransform; + + // Primitive XForms + if (xform && !engine->hasFeature(QPaintEngine::PrimitiveTransform)) + s->emulationSpecifier |= QPaintEngine::PrimitiveTransform; + else + s->emulationSpecifier &= ~QPaintEngine::PrimitiveTransform; + + // Perspective XForms + if (complexXform && !engine->hasFeature(QPaintEngine::PerspectiveTransform)) + s->emulationSpecifier |= QPaintEngine::PerspectiveTransform; + else + s->emulationSpecifier &= ~QPaintEngine::PerspectiveTransform; + + // Constant opacity + if (state->opacity != 1 && !engine->hasFeature(QPaintEngine::ConstantOpacity)) + s->emulationSpecifier |= QPaintEngine::ConstantOpacity; + else + s->emulationSpecifier &= ~QPaintEngine::ConstantOpacity; + + bool gradientStretch = false; + bool objectBoundingMode = false; + if (linearGradient || conicalGradient || radialGradient) { + QGradient::CoordinateMode brushMode = coordinateMode(s->brush); + QGradient::CoordinateMode penMode = coordinateMode(s->pen.brush()); + + gradientStretch |= (brushMode == QGradient::StretchToDeviceMode); + gradientStretch |= (penMode == QGradient::StretchToDeviceMode); + + objectBoundingMode |= (brushMode == QGradient::ObjectBoundingMode); + objectBoundingMode |= (penMode == QGradient::ObjectBoundingMode); + } + if (gradientStretch) + s->emulationSpecifier |= QGradient_StretchToDevice; + else + s->emulationSpecifier &= ~QGradient_StretchToDevice; + + if (objectBoundingMode && !engine->hasFeature(QPaintEngine::ObjectBoundingModeGradients)) + s->emulationSpecifier |= QPaintEngine::ObjectBoundingModeGradients; + else + s->emulationSpecifier &= ~QPaintEngine::ObjectBoundingModeGradients; + + // Opaque backgrounds... + if (s->bgMode == Qt::OpaqueMode && + (is_pen_transparent(s->pen) || is_brush_transparent(s->brush))) + s->emulationSpecifier |= QPaintEngine_OpaqueBackground; + else + s->emulationSpecifier &= ~QPaintEngine_OpaqueBackground; + +#if 0 + //won't be correct either way because the device can already have + // something rendered to it in which case subsequent emulation + // on a fully transparent qimage and then blitting the results + // won't produce correct results + // Blend modes + if (state->composition_mode > QPainter::CompositionMode_Xor && + !engine->hasFeature(QPaintEngine::BlendModes)) + s->emulationSpecifier |= QPaintEngine::BlendModes; + else + s->emulationSpecifier &= ~QPaintEngine::BlendModes; +#endif +} + +void QPainterPrivate::updateStateImpl(QPainterState *newState) +{ + // ### we might have to call QPainter::begin() here... + if (!engine->state) { + engine->state = newState; + engine->setDirty(QPaintEngine::AllDirty); + } + + if (engine->state->painter() != newState->painter) + // ### this could break with clip regions vs paths. + engine->setDirty(QPaintEngine::AllDirty); + + // Upon restore, revert all changes since last save + else if (engine->state != newState) + newState->dirtyFlags |= QPaintEngine::DirtyFlags(static_cast<QPainterState *>(engine->state)->changeFlags); + + // We need to store all changes made so that restore can deal with them + else + newState->changeFlags |= newState->dirtyFlags; + + updateEmulationSpecifier(newState); + + // Unset potential dirty background mode + newState->dirtyFlags &= ~(QPaintEngine::DirtyBackgroundMode + | QPaintEngine::DirtyBackground); + + engine->state = newState; + engine->updateState(*newState); + engine->clearDirty(QPaintEngine::AllDirty); + +} + +void QPainterPrivate::updateState(QPainterState *newState) +{ + + if (!newState) { + engine->state = newState; + + } else if (newState->state() || engine->state!=newState) { + bool setNonCosmeticPen = (newState->renderHints & QPainter::NonCosmeticDefaultPen) + && newState->pen.widthF() == 0; + if (setNonCosmeticPen) { + // Override the default pen's cosmetic state if the + // NonCosmeticDefaultPen render hint is used. + QPen oldPen = newState->pen; + newState->pen.setWidth(1); + newState->pen.setCosmetic(false); + newState->dirtyFlags |= QPaintEngine::DirtyPen; + + updateStateImpl(newState); + + // Restore the state pen back to its default to preserve visible + // state. + newState->pen = oldPen; + } else { + updateStateImpl(newState); + } + } +} + + +/*! + \class QPainter + \brief The QPainter class performs low-level painting on widgets and + other paint devices. + + \ingroup multimedia + \mainclass + \reentrant + + QPainter provides highly optimized functions to do most of the + drawing GUI programs require. It can draw everything from simple + lines to complex shapes like pies and chords. It can also draw + aligned text and pixmaps. Normally, it draws in a "natural" + coordinate system, but it can also do view and world + transformation. QPainter can operate on any object that inherits + the QPaintDevice class. + + The common use of QPainter is inside a widget's paint event: + Construct and customize (e.g. set the pen or the brush) the + painter. Then draw. Remember to destroy the QPainter object after + drawing. For example: + + \snippet doc/src/snippets/code/src_gui_painting_qpainter.cpp 0 + + The core functionality of QPainter is drawing, but the class also + provide several functions that allows you to customize QPainter's + settings and its rendering quality, and others that enable + clipping. In addition you can control how different shapes are + merged together by specifying the painter's composition mode. + + The isActive() function indicates whether the painter is active. A + painter is activated by the begin() function and the constructor + that takes a QPaintDevice argument. The end() function, and the + destructor, deactivates it. + + Together with the QPaintDevice and QPaintEngine classes, QPainter + form the basis for Qt's paint system. QPainter is the class used + to perform drawing operations. QPaintDevice represents a device + that can be painted on using a QPainter. QPaintEngine provides the + interface that the painter uses to draw onto different types of + devices. If the painter is active, device() returns the paint + device on which the painter paints, and paintEngine() returns the + paint engine that the painter is currently operating on. For more + information, see \l {The Paint System} documentation. + + Sometimes it is desirable to make someone else paint on an unusual + QPaintDevice. QPainter supports a static function to do this, + setRedirected(). + + \warning When the paintdevice is a widget, QPainter can only be + used inside a paintEvent() function or in a function called by + paintEvent(); that is unless the Qt::WA_PaintOutsidePaintEvent + widget attribute is set. On Mac OS X and Windows, you can only + paint in a paintEvent() function regardless of this attribute's + setting. + + \tableofcontents + + \section1 Settings + + There are several settings that you can customize to make QPainter + draw according to your preferences: + + \list + + \o font() is the font used for drawing text. If the painter + isActive(), you can retrieve information about the currently set + font, and its metrics, using the fontInfo() and fontMetrics() + functions respectively. + + \o brush() defines the color or pattern that is used for filling + shapes. + + \o pen() defines the color or stipple that is used for drawing + lines or boundaries. + + \o backgroundMode() defines whether there is a background() or + not, i.e it is either Qt::OpaqueMode or Qt::TransparentMode. + + \o background() only applies when backgroundMode() is \l + Qt::OpaqueMode and pen() is a stipple. In that case, it + describes the color of the background pixels in the stipple. + + \o brushOrigin() defines the origin of the tiled brushes, normally + the origin of widget's background. + + \o viewport(), window(), worldMatrix() make up the painter's coordinate + transformation system. For more information, see the \l + {Coordinate Transformations} section and the \l {The Coordinate + System} documentation. + + \o hasClipping() tells whether the painter clips at all. (The paint + device clips, too.) If the painter clips, it clips to clipRegion(). + + \o layoutDirection() defines the layout direction used by the + painter when drawing text. + + \o matrixEnabled() tells whether world transformation is enabled. + + \o viewTransformEnabled() tells whether view transformation is + enabled. + + \endlist + + Note that some of these settings mirror settings in some paint + devices, e.g. QWidget::font(). The QPainter::begin() function (or + equivalently the QPainter constructor) copies these attributes + from the paint device. + + You can at any time save the QPainter's state by calling the + save() function which saves all the available settings on an + internal stack. The restore() function pops them back. + + \section1 Drawing + + QPainter provides functions to draw most primitives: drawPoint(), + drawPoints(), drawLine(), drawRect(), drawRoundedRect(), + drawEllipse(), drawArc(), drawPie(), drawChord(), drawPolyline(), + drawPolygon(), drawConvexPolygon() and drawCubicBezier(). The two + convenience functions, drawRects() and drawLines(), draw the given + number of rectangles or lines in the given array of \l + {QRect}{QRects} or \l {QLine}{QLines} using the current pen and + brush. + + The QPainter class also provides the fillRect() function which + fills the given QRect, with the given QBrush, and the eraseRect() + function that erases the area inside the given rectangle. + + All of these functions have both integer and floating point + versions. + + \table 100% + \row + \o \inlineimage qpainter-basicdrawing.png + \o + \bold {Basic Drawing Example} + + The \l {painting/basicdrawing}{Basic Drawing} example shows how to + display basic graphics primitives in a variety of styles using the + QPainter class. + + \endtable + + If you need to draw a complex shape, especially if you need to do + so repeatedly, consider creating a QPainterPath and drawing it + using drawPath(). + + \table 100% + \row + \o + \bold {Painter Paths example} + + The QPainterPath class provides a container for painting + operations, enabling graphical shapes to be constructed and + reused. + + The \l {painting/painterpaths}{Painter Paths} example shows how + painter paths can be used to build complex shapes for rendering. + + \o \inlineimage qpainter-painterpaths.png + \endtable + + QPainter also provides the fillPath() function which fills the + given QPainterPath with the given QBrush, and the strokePath() + function that draws the outline of the given path (i.e. strokes + the path). + + See also the \l {demos/deform}{Vector Deformation} demo which + shows how to use advanced vector techniques to draw text using a + QPainterPath, the \l {demos/gradients}{Gradients} demo which shows + the different types of gradients that are available in Qt, and the \l + {demos/pathstroke}{Path Stroking} demo which shows Qt's built-in + dash patterns and shows how custom patterns can be used to extend + the range of available patterns. + + \table + \row + \o \inlineimage qpainter-vectordeformation.png + \o \inlineimage qpainter-gradients.png + \o \inlineimage qpainter-pathstroking.png + \header + \o \l {demos/deform}{Vector Deformation} + \o \l {demos/gradients}{Gradients} + \o \l {demos/pathstroke}{Path Stroking} + \endtable + + + There are functions to draw pixmaps/images, namely drawPixmap(), + drawImage() and drawTiledPixmap(). Both drawPixmap() and drawImage() + produce the same result, except that drawPixmap() is faster + on-screen while drawImage() may be faster on a QPrinter or other + devices. + + Text drawing is done using drawText(). When you need + fine-grained positioning, boundingRect() tells you where a given + drawText() command will draw. + + There is a drawPicture() function that draws the contents of an + entire QPicture. The drawPicture() function is the only function + that disregards all the painter's settings as QPicture has its own + settings. + + \section1 Rendering Quality + + To get the optimal rendering result using QPainter, you should use + the platform independent QImage as paint device; i.e. using QImage + will ensure that the result has an identical pixel representation + on any platform. + + The QPainter class also provides a means of controlling the + rendering quality through its RenderHint enum and the support for + floating point precision: All the functions for drawing primitives + has a floating point version. These are often used in combination + with the \l {RenderHint}{QPainter::Antialiasing} render hint. + + \table 100% + \row + \o \inlineimage qpainter-concentriccircles.png + \o + \bold {Concentric Circles Example} + + The \l {painting/concentriccircles}{Concentric Circles} example + shows the improved rendering quality that can be obtained using + floating point precision and anti-aliasing when drawing custom + widgets. + + The application's main window displays several widgets which are + drawn using the various combinations of precision and + anti-aliasing. + + \endtable + + The RenderHint enum specifies flags to QPainter that may or may + not be respected by any given engine. \l + {RenderHint}{QPainter::Antialiasing} indicates that the engine + should antialias edges of primitives if possible, \l + {RenderHint}{QPainter::TextAntialiasing} indicates that the engine + should antialias text if possible, and the \l + {RenderHint}{QPainter::SmoothPixmapTransform} indicates that the + engine should use a smooth pixmap transformation algorithm. + \l {RenderHint}{HighQualityAntialiasing} is an OpenGL-specific rendering hint + indicating that the engine should use fragment programs and offscreen + rendering for antialiasing. + + The renderHints() function returns a flag that specifies the + rendering hints that are set for this painter. Use the + setRenderHint() function to set or clear the currently set + RenderHints. + + \section1 Coordinate Transformations + + Normally, the QPainter operates on the device's own coordinate + system (usually pixels), but QPainter has good support for + coordinate transformations. + + \table + \row + \o \inlineimage qpainter-clock.png + \o \inlineimage qpainter-rotation.png + \o \inlineimage qpainter-scale.png + \o \inlineimage qpainter-translation.png + \header + \o nop \o rotate() \o scale() \o translate() + \endtable + + The most commonly used transformations are scaling, rotation, + translation and shearing. Use the scale() function to scale the + coordinate system by a given offset, the rotate() function to + rotate it clockwise and translate() to translate it (i.e. adding a + given offset to the points). You can also twist the coordinate + system around the origin using the shear() function. See the \l + {demos/affine}{Affine Transformations} demo for a visualization of + a sheared coordinate system. + + See also the \l {painting/transformations}{Transformations} + example which shows how transformations influence the way that + QPainter renders graphics primitives. In particular it shows how + the order of transformations affects the result. + + \table 100% + \row + \o + \bold {Affine Transformations Demo} + + The \l {demos/affine}{Affine Transformations} demo show Qt's + ability to perform affine transformations on painting + operations. The demo also allows the user to experiment with the + transformation operations and see the results immediately. + + \o \inlineimage qpainter-affinetransformations.png + \endtable + + All the tranformation operations operate on the transformation + worldMatrix(). A matrix transforms a point in the plane to another + point. For more information about the transformation matrix, see + the \l {The Coordinate System} and QMatrix documentation. + + The setWorldMatrix() function can replace or add to the currently + set worldMatrix(). The resetMatrix() function resets any + transformations that were made using translate(), scale(), + shear(), rotate(), setWorldMatrix(), setViewport() and setWindow() + functions. The deviceMatrix() returns the matrix that transforms + from logical coordinates to device coordinates of the platform + dependent paint device. The latter function is only needed when + using platform painting commands on the platform dependent handle, + and the platform does not do transformations nativly. + + When drawing with QPainter, we specify points using logical + coordinates which then are converted into the physical coordinates + of the paint device. The mapping of the logical coordinates to the + physical coordinates are handled by QPainter's combinedMatrix(), a + combination of viewport() and window() and worldMatrix(). The + viewport() represents the physical coordinates specifying an + arbitrary rectangle, the window() describes the same rectangle in + logical coordinates, and the worldMatrix() is identical with the + transformation matrix. + + See also \l {The Coordinate System} documentation. + + \section1 Clipping + + QPainter can clip any drawing operation to a rectangle, a region, + or a vector path. The current clip is available using the + functions clipRegion() and clipPath(). Whether paths or regions are + preferred (faster) depends on the underlying paintEngine(). For + example, the QImage paint engine prefers paths while the X11 paint + engine prefers regions. Setting a clip is done in the painters + logical coordinates. + + After QPainter's clipping, the paint device may also clip. For + example, most widgets clip away the pixels used by child widgets, + and most printers clip away an area near the edges of the paper. + This additional clipping is not reflected by the return value of + clipRegion() or hasClipping(). + + \section1 Composition Modes + \target Composition Modes + + QPainter provides the CompositionMode enum which defines the + Porter-Duff rules for digital image compositing; it describes a + model for combining the pixels in one image, the source, with the + pixels in another image, the destination. + + The two most common forms of composition are \l + {QPainter::CompositionMode}{Source} and \l + {QPainter::CompositionMode}{SourceOver}. \l + {QPainter::CompositionMode}{Source} is used to draw opaque objects + onto a paint device. In this mode, each pixel in the source + replaces the corresponding pixel in the destination. In \l + {QPainter::CompositionMode}{SourceOver} composition mode, the + source object is transparent and is drawn on top of the + destination. + + Note that composition transformation operates pixelwise. For that + reason, there is a difference between using the grahic primitive + itself and its bounding rectangle: The bounding rect contains + pixels with alpha == 0 (i.e the pixels surrounding the + primitive). These pixels will overwrite the other image's pixels, + affectively clearing those, while the primitive only overwrites + its own area. + + \table 100% + \row + \o \inlineimage qpainter-compositiondemo.png + + \o + \bold {Composition Modes Demo} + + The \l {demos/composition}{Composition Modes} demo, available in + Qt's demo directory, allows you to experiment with the various + composition modes and see the results immediately. + + \endtable + + \section1 Limitations + \target Limitations + + If you are using coordinates with Qt's raster-based paint engine, it is + important to note that, while coordinates greater than +/- 2\sup 15 can + be used, any painting performed with coordinates outside this range is not + guaranteed to be shown; the drawing may be clipped. This is due to the + use of \c{short int} in the implementation. + + The outlines generated by Qt's stroker are only an approximation when dealing + with curved shapes. It is in most cases impossible to represent the outline of + a bezier curve segment using another bezier curve segment, and so Qt approximates + the curve outlines by using several smaller curves. For performance reasons there + is a limit to how many curves Qt uses for these outlines, and thus when using + large pen widths or scales the outline error increases. To generate outlines with + smaller errors it is possible to use the QPainterPathStroker class, which has the + setCurveThreshold member function which let's the user specify the error tolerance. + Another workaround is to convert the paths to polygons first and then draw the + polygons instead. + + \sa QPaintDevice, QPaintEngine, {QtSvg Module}, {Basic Drawing Example} +*/ + +/*! + \enum QPainter::RenderHint + + Renderhints are used to specify flags to QPainter that may or + may not be respected by any given engine. + + \value Antialiasing Indicates that the engine should antialias + edges of primitives if possible. + + \value TextAntialiasing Indicates that the engine should antialias + text if possible. To forcibly disable antialiasing for text, do not + use this hint. Instead, set QFont::NoAntialias on your font's style + strategy. + + \value SmoothPixmapTransform Indicates that the engine should use + a smooth pixmap transformation algorithm (such as bilinear) rather + than nearest neighbor. + + \value HighQualityAntialiasing An OpenGL-specific rendering hint + indicating that the engine should use fragment programs and offscreen + rendering for antialiasing. + + \value NonCosmeticDefaultPen The engine should interpret pens with a width + of 0 (which otherwise enables QPen::isCosmetic()) as being a non-cosmetic + pen with a width of 1. + + \sa renderHints(), setRenderHint(), {QPainter#Rendering + Quality}{Rendering Quality}, {Concentric Circles Example} + +*/ + +/*! + Constructs a painter. + + \sa begin(), end() +*/ + +QPainter::QPainter() +{ + d_ptr = new QPainterPrivate(this); +} + +/*! + \fn QPainter::QPainter(QPaintDevice *device) + + Constructs a painter that begins painting the paint \a device + immediately. + + This constructor is convenient for short-lived painters, e.g. in a + QWidget::paintEvent() and should be used only once. The + constructor calls begin() for you and the QPainter destructor + automatically calls end(). + + Here's an example using begin() and end(): + \snippet doc/src/snippets/code/src_gui_painting_qpainter.cpp 1 + + The same example using this constructor: + \snippet doc/src/snippets/code/src_gui_painting_qpainter.cpp 2 + + Since the constructor cannot provide feedback when the initialization + of the painter failed you should rather use begin() and end() to paint + on external devices, e.g. printers. + + \sa begin(), end() +*/ + +QPainter::QPainter(QPaintDevice *pd) + : d_ptr(0) +{ + Q_ASSERT(pd != 0); + if (!QPainterPrivate::attachPainterPrivate(this, pd)) { + d_ptr = new QPainterPrivate(this); + begin(pd); + } + Q_ASSERT(d_ptr); +} + +/*! + Destroys the painter. +*/ +QPainter::~QPainter() +{ + d_ptr->inDestructor = true; + if (isActive()) + end(); + else if (d_ptr->refcount > 1) + d_ptr->detachPainterPrivate(this); + + if (d_ptr) { + // Make sure we haven't messed things up. + Q_ASSERT(d_ptr->inDestructor); + d_ptr->inDestructor = false; + Q_ASSERT(d_ptr->refcount == 1); + if (d_ptr->d_ptrs) + free(d_ptr->d_ptrs); + delete d_ptr; + } +} + +/*! + Returns the paint device on which this painter is currently + painting, or 0 if the painter is not active. + + \sa isActive() +*/ + +QPaintDevice *QPainter::device() const +{ + Q_D(const QPainter); + if (isActive() && d->engine->d_func()->currentClipWidget) + return d->engine->d_func()->currentClipWidget; + return d->original_device; +} + +/*! + Returns true if begin() has been called and end() has not yet been + called; otherwise returns false. + + \sa begin(), QPaintDevice::paintingActive() +*/ + +bool QPainter::isActive() const +{ + Q_D(const QPainter); + return d->engine; +} + +/*! + Initializes the painters pen, background and font to the same as + the given \a widget. Call this function after begin() while the + painter is active. + + \sa begin(), {QPainter#Settings}{Settings} +*/ +void QPainter::initFrom(const QWidget *widget) +{ + Q_ASSERT_X(widget, "QPainter::initFrom(const QWidget *widget)", "Widget cannot be 0"); + Q_D(QPainter); + if (!d->engine) { + qWarning("QPainter::initFrom: Painter not active, aborted"); + return; + } + + const QPalette &pal = widget->palette(); + d->state->pen = QPen(pal.brush(widget->foregroundRole()), 0); + d->state->bgBrush = pal.brush(widget->backgroundRole()); + d->state->deviceFont = QFont(widget->font(), const_cast<QWidget*> (widget)); + d->state->font = d->state->deviceFont; + if (d->engine) { + d->engine->setDirty(QPaintEngine::DirtyPen); + d->engine->setDirty(QPaintEngine::DirtyBrush); + d->engine->setDirty(QPaintEngine::DirtyFont); + } + d->state->layoutDirection = widget->layoutDirection(); +} + + +/*! + Saves the current painter state (pushes the state onto a stack). A + save() must be followed by a corresponding restore(); the end() + function unwinds the stack. + + \sa restore() +*/ + +void QPainter::save() +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::save()\n"); +#endif + Q_D(QPainter); + if (!d->engine) { + qWarning("QPainter::save: Painter not active"); + return; + } + + if (d->extended) { + d->state = d->extended->createState(d->states.back()); + d->extended->setState(d->state); + } else { + d->updateState(d->state); + d->state = new QPainterState(d->states.back()); + d->engine->state = d->state; + } + d->states.push_back(d->state); +} + +/*! + Restores the current painter state (pops a saved state off the + stack). + + \sa save() +*/ + +void QPainter::restore() +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::restore()\n"); +#endif + Q_D(QPainter); + if (d->states.size()<=1) { + qWarning("QPainter::restore: Unbalanced save/restore"); + return; + } else if (!d->engine) { + qWarning("QPainter::restore: Painter not active"); + return; + } + + QPainterState *tmp = d->state; + d->states.pop_back(); + d->state = d->states.back(); + d->txinv = false; + + if (d->extended) { + d->checkEmulation(); + d->extended->setState(d->state); + delete tmp; + return; + } + + // trigger clip update if the clip path/region has changed since + // last save + if (!d->state->clipInfo.isEmpty() + && (tmp->changeFlags & (QPaintEngine::DirtyClipRegion | QPaintEngine::DirtyClipPath))) { + // reuse the tmp state to avoid any extra allocs... + tmp->dirtyFlags = QPaintEngine::DirtyClipPath; + tmp->clipOperation = Qt::NoClip; + tmp->clipPath = QPainterPath(); + d->engine->updateState(*tmp); + // replay the list of clip states, + for (int i=0; i<d->state->clipInfo.size(); ++i) { + const QPainterClipInfo &info = d->state->clipInfo.at(i); + tmp->matrix.setMatrix(info.matrix.m11(), info.matrix.m12(), info.matrix.m13(), + info.matrix.m21(), info.matrix.m22(), info.matrix.m23(), + info.matrix.dx() - d->state->redirection_offset.x(), + info.matrix.dy() - d->state->redirection_offset.y(), info.matrix.m33()); + tmp->clipOperation = info.operation; + if (info.clipType == QPainterClipInfo::RectClip) { + tmp->dirtyFlags = QPaintEngine::DirtyClipRegion | QPaintEngine::DirtyTransform; + tmp->clipRegion = info.rect; + } else if (info.clipType == QPainterClipInfo::RegionClip) { + tmp->dirtyFlags = QPaintEngine::DirtyClipRegion | QPaintEngine::DirtyTransform; + tmp->clipRegion = info.region; + } else { // clipType == QPainterClipInfo::PathClip + tmp->dirtyFlags = QPaintEngine::DirtyClipPath | QPaintEngine::DirtyTransform; + tmp->clipPath = info.path; + } + d->engine->updateState(*tmp); + } + + + //Since we've updated the clip region anyway, pretend that the clip path hasn't changed: + d->state->dirtyFlags &= ~(QPaintEngine::DirtyClipPath | QPaintEngine::DirtyClipRegion); + tmp->changeFlags &= ~(QPaintEngine::DirtyClipPath | QPaintEngine::DirtyClipRegion); + tmp->changeFlags |= QPaintEngine::DirtyTransform; + } + + d->updateState(d->state); + delete tmp; +} + + +/*! + + \fn bool QPainter::begin(QPaintDevice *device) + + Begins painting the paint \a device and returns true if + successful; otherwise returns false. + + Notice that all painter settings (setPen(), setBrush() etc.) are reset + to default values when begin() is called. + + The errors that can occur are serious problems, such as these: + + \snippet doc/src/snippets/code/src_gui_painting_qpainter.cpp 3 + + Note that most of the time, you can use one of the constructors + instead of begin(), and that end() is automatically done at + destruction. + + \warning A paint device can only be painted by one painter at a + time. + + \sa end(), QPainter() +*/ + +bool QPainter::begin(QPaintDevice *pd) +{ + Q_ASSERT(pd); + + if (pd->painters > 0) { + qWarning("QPainter::begin: A paint device can only be painted by one painter at a time."); + return false; + } + + if (d_ptr->engine) { + qWarning("QPainter::begin: Painter already active"); + return false; + } + + if (QPainterPrivate::attachPainterPrivate(this, pd)) + return true; + + Q_D(QPainter); + + d->helper_device = pd; + d->original_device = pd; + QPaintDevice *rpd = 0; + + QPoint redirectionOffset; + // We know for sure that redirection is broken when the widget is inside + // its paint event, so it's safe to use our hard-coded redirection. However, + // there IS one particular case we still need to support, and that's + // when people call QPainter::setRedirected in the widget's paint event right + // before any painter is created (or QPainter::begin is called). In that + // particular case our hard-coded redirection is restored and the redirection + // is retrieved from QPainter::redirected (as before). + if (pd->devType() == QInternal::Widget) + rpd = static_cast<QWidget *>(pd)->d_func()->redirected(&redirectionOffset); + + if (!rpd) + rpd = redirected(pd, &redirectionOffset); + + if (rpd) + pd = rpd; + +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::begin(), device=%p, type=%d\n", pd, pd->devType()); +#endif + + + d->device = pd; + if (pd->devType() == QInternal::Pixmap) + static_cast<QPixmap *>(pd)->detach(); + else if (pd->devType() == QInternal::Image) + static_cast<QImage *>(pd)->detach(); + + d->engine = pd->paintEngine(); + d->extended = d->engine && d->engine->isExtended() ? static_cast<QPaintEngineEx *>(d->engine) : 0; + if (d->emulationEngine) + d->emulationEngine->real_engine = d->extended; + + // Setup new state... + Q_ASSERT(!d->state); + d->state = d->extended ? d->extended->createState(0) : new QPainterState; + d->state->painter = this; + d->states.push_back(d->state); + + d->state->redirection_offset = redirectionOffset; + d->state->brushOrigin = QPointF(); + + if (!d->engine) { + qWarning("QPainter::begin: Paint device returned engine == 0, type: %d", pd->devType()); + return true; + } + + // Slip a painter state into the engine before we do any other operations + if (d->extended) + d->extended->setState(d->state); + else + d->engine->state = d->state; + + switch (pd->devType()) { + case QInternal::Widget: + { + const QWidget *widget = static_cast<const QWidget *>(pd); + Q_ASSERT(widget); + + const bool paintOutsidePaintEvent = widget->testAttribute(Qt::WA_PaintOutsidePaintEvent); + const bool inPaintEvent = widget->testAttribute(Qt::WA_WState_InPaintEvent); + if(!d->engine->hasFeature(QPaintEngine::PaintOutsidePaintEvent) + && !paintOutsidePaintEvent && !inPaintEvent) { + qWarning("QPainter::begin: Widget painting can only begin as a " + "result of a paintEvent"); + d->engine = 0; + d->device = 0; + return false; + } + + // Adjust offset for alien widgets painting outside the paint event. + if (!inPaintEvent && paintOutsidePaintEvent && !widget->internalWinId() + && widget->testAttribute(Qt::WA_WState_Created)) { + d->state->redirection_offset -= widget->mapTo(widget->nativeParentWidget(), QPoint()); + } + break; + } + case QInternal::Pixmap: + { + QPixmap *pm = static_cast<QPixmap *>(pd); + Q_ASSERT(pm); + if (pm->isNull()) { + qWarning("QPainter::begin: Cannot paint on a null pixmap"); + d->engine = 0; + d->device = 0; + return false; + } + + if (pm->depth() == 1) { + d->state->pen = QPen(Qt::color1); + d->state->brush = QBrush(Qt::color0); + } + break; + } + case QInternal::Image: + { + QImage *img = static_cast<QImage *>(pd); + Q_ASSERT(img); + if (img->isNull()) { + qWarning("QPainter::begin: Cannot paint on a null image"); + d->engine = 0; + d->device = 0; + return false; + } + if (img->depth() == 1) { + d->state->pen = QPen(Qt::color1); + d->state->brush = QBrush(Qt::color0); + } + break; + } + default: + break; + } + if (d->state->ww == 0) // For compat with 3.x painter defaults + d->state->ww = d->state->wh = d->state->vw = d->state->vh = 1024; + + d->engine->setPaintDevice(pd); + + bool begun = d->engine->begin(pd); + if (!begun) { + qWarning("QPainter::begin(): Returned false"); + if (d->engine->isActive()) { + end(); + } else { + d->states.clear(); + delete d->state; + d->state = 0; + } + d->engine = 0; + d->device = 0; + return false; + } else { + d->engine->setActive(begun); + } + + // Copy painter properties from original paint device, + // required for QPixmap::grabWidget() + if (d->original_device->devType() == QInternal::Widget) { + QWidget *widget = static_cast<QWidget *>(d->original_device); + initFrom(widget); + } else { + d->state->layoutDirection = QApplication::layoutDirection(); + // make sure we have a font compatible with the paintdevice + d->state->deviceFont = d->state->font = QFont(d->state->deviceFont, device()); + } + + QRect systemRect = d->engine->systemRect(); + if (!systemRect.isEmpty()) { + d->state->ww = d->state->vw = systemRect.width(); + d->state->wh = d->state->vh = systemRect.height(); + } else { + d->state->ww = d->state->vw = pd->metric(QPaintDevice::PdmWidth); + d->state->wh = d->state->vh = pd->metric(QPaintDevice::PdmHeight); + } + + d->state->redirection_offset += d->engine->coordinateOffset(); + + Q_ASSERT(d->engine->isActive()); + + if (!d->state->redirection_offset.isNull()) + d->updateMatrix(); + + Q_ASSERT(d->engine->isActive()); + d->state->renderHints = QPainter::TextAntialiasing; + ++d->device->painters; + + d->state->emulationSpecifier = 0; + + return true; +} + +/*! + Ends painting. Any resources used while painting are released. You + don't normally need to call this since it is called by the + destructor. + + Returns true if the painter is no longer active; otherwise returns false. + + \sa begin(), isActive() +*/ + +bool QPainter::end() +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::end()\n"); +#endif + Q_D(QPainter); + + if (!d->engine) { + qWarning("QPainter::end: Painter not active, aborted"); + d->states.clear(); + delete d->state; + d->state = 0; + d->device = 0; + return false; + } + + if (d->refcount > 1) { + d->detachPainterPrivate(this); + return true; + } + + if (d->states.size() > 1) { + qWarning("QPainter::end: Painter ended with %d saved states", + d->states.size()); + } + + bool ended = true; + + if (d->engine->isActive()) { + ended = d->engine->end(); + d->updateState(0); + + --d->device->painters; + if (d->device->painters == 0) { + d->engine->setPaintDevice(0); + d->engine->setActive(false); + } + } + + if (d->engine->autoDestruct()) { + delete d->engine; + } + + d->engine = 0; + + if (d->emulationEngine) { + delete d->emulationEngine; + d->emulationEngine = 0; + } + + if (d->extended) { + d->extended = 0; + } + + d->states.clear(); + delete d->state; + d->state = 0; + + d->device = 0; + return ended; +} + + +/*! + Returns the paint engine that the painter is currently operating + on if the painter is active; otherwise 0. + + \sa isActive() +*/ +QPaintEngine *QPainter::paintEngine() const +{ + Q_D(const QPainter); + return d->engine; +} + + +/*! + Returns the font metrics for the painter if the painter is + active. Otherwise, the return value is undefined. + + \sa font(), isActive(), {QPainter#Settings}{Settings} +*/ + +QFontMetrics QPainter::fontMetrics() const +{ + Q_D(const QPainter); + if (!d->engine) { + qWarning("QPainter::fontMetrics: Painter not active"); + return QFontMetrics(QFont()); + } + return QFontMetrics(d->state->font); +} + + +/*! + Returns the font info for the painter if the painter is + active. Otherwise, the return value is undefined. + + \sa font(), isActive(), {QPainter#Settings}{Settings} +*/ + +QFontInfo QPainter::fontInfo() const +{ + Q_D(const QPainter); + if (!d->engine) { + qWarning("QPainter::fontInfo: Painter not active"); + return QFontInfo(QFont()); + } + return QFontInfo(d->state->font); +} + +/*! + \since 4.2 + + Returns the opacity of the painter. The default value is + 1. +*/ + +qreal QPainter::opacity() const +{ + Q_D(const QPainter); + if (!d->engine) { + qWarning("QPainter::opacity: Painter not active"); + return 1.0; + } + return d->state->opacity; +} + +/*! + \since 4.2 + + Sets the opacity of the painter to \a opacity. The value should + be in the range 0.0 to 1.0, where 0.0 is fully transparent and + 1.0 is fully opaque. + + Opacity set on the painter will apply to all drawing operations + individually. +*/ + +void QPainter::setOpacity(qreal opacity) +{ + Q_D(QPainter); + + if (!d->engine) { + qWarning("QPainter::setOpacity: Painter not active"); + return; + } + + opacity = qMin(qreal(1), qMax(qreal(0), opacity)); + + if (opacity == d->state->opacity) + return; + + d->state->opacity = opacity; + + if (d->extended) + d->extended->opacityChanged(); + else + d->state->dirtyFlags |= QPaintEngine::DirtyOpacity; +} + + +/*! + Returns the currently set brush origin. + + \sa setBrushOrigin(), {QPainter#Settings}{Settings} +*/ + +QPoint QPainter::brushOrigin() const +{ + Q_D(const QPainter); + if (!d->engine) { + qWarning("QPainter::brushOrigin: Painter not active"); + return QPoint(); + } + return QPointF(d->state->brushOrigin).toPoint(); +} + +/*! + \fn void QPainter::setBrushOrigin(const QPointF &position) + + Sets the brush origin to \a position. + + The brush origin specifies the (0, 0) coordinate of the painter's + brush. This setting only applies to pattern brushes and pixmap + brushes. + + Note that while the brushOrigin() was necessary to adopt the + parent's background for a widget in Qt 3, this is no longer the + case since the Qt 4 painter doesn't paint the background unless + you explicitly tell it to do so by setting the widget's \l + {QWidget::autoFillBackground}{autoFillBackground} property to + true. + + \sa brushOrigin(), {QPainter#Settings}{Settings} +*/ + +void QPainter::setBrushOrigin(const QPointF &p) +{ + Q_D(QPainter); +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::setBrushOrigin(), (%.2f,%.2f)\n", p.x(), p.y()); +#endif + + if (!d->engine) { + qWarning("QPainter::setBrushOrigin: Painter not active"); + return; + } + + d->state->brushOrigin = p; + + if (d->extended) { + d->extended->brushOriginChanged(); + return; + } + + d->state->dirtyFlags |= QPaintEngine::DirtyBrushOrigin; +} + +/*! + \fn void QPainter::setBrushOrigin(const QPoint &position) + \overload + + Sets the brush's origin to the given \a position. +*/ + +/*! + \fn void QPainter::setBrushOrigin(int x, int y) + + \overload + + Sets the brush's origin to point (\a x, \a y). +*/ + +/*! + \enum QPainter::CompositionMode + + Defines the modes supported for digital image compositing. + Composition modes are used to specify how the pixels in one image, + the source, are merged with the pixel in another image, the + destination. + + Please note that the bitwise raster operation modes, denoted with + a RasterOp prefix, are only natively supported in the X11 and + raster paint engines. This means that the only way to utilize + these modes on the Mac is via a QImage. The RasterOp denoted blend + modes are \e not supported for pens and brushes with alpha + components. Also, turning on the QPainter::Antialiasing render + hint will effectively disable the RasterOp modes. + + + \image qpainter-compositionmode1.png + \image qpainter-compositionmode2.png + + The most common type is SourceOver (often referred to as just + alpha blending) where the source pixel is blended on top of the + destination pixel in such a way that the alpha component of the + source defines the translucency of the pixel. + + When the paint device is a QImage, the image format must be set to + \l {QImage::Format}{Format_ARGB32Premultiplied} or + \l {QImage::Format}{Format_ARGB32} for the composition modes to have + any effect. For performance the premultiplied version is the preferred + format. + + When a composition mode is set it applies to all painting + operator, pens, brushes, gradients and pixmap/image drawing. + + \value CompositionMode_SourceOver This is the default mode. The + alpha of the source is used to blend the pixel on top of the + destination. + + \value CompositionMode_DestinationOver The alpha of the + destination is used to blend it on top of the source pixels. This + mode is the inverse of CompositionMode_SourceOver. + + \value CompositionMode_Clear The pixels in the destination are + cleared (set to fully transparent) independent of the source. + + \value CompositionMode_Source The output is the source + pixel. (This means a basic copy operation and is identical to + SourceOver when the source pixel is opaque). + + \value CompositionMode_Destination The output is the destination + pixel. This means that the blending has no effect. This mode is + the inverse of CompositionMode_Source. + + \value CompositionMode_SourceIn The output is the source, where + the alpha is reduced by that of the destination. + + \value CompositionMode_DestinationIn The output is the + destination, where the alpha is reduced by that of the + source. This mode is the inverse of CompositionMode_SourceIn. + + \value CompositionMode_SourceOut The output is the source, where + the alpha is reduced by the inverse of destination. + + \value CompositionMode_DestinationOut The output is the + destination, where the alpha is reduced by the inverse of the + source. This mode is the inverse of CompositionMode_SourceOut. + + \value CompositionMode_SourceAtop The source pixel is blended on + top of the destination, with the alpha of the source pixel reduced + by the alpha of the destination pixel. + + \value CompositionMode_DestinationAtop The destination pixel is + blended on top of the source, with the alpha of the destination + pixel is reduced by the alpha of the destination pixel. This mode + is the inverse of CompositionMode_SourceAtop. + + \value CompositionMode_Xor The source, whose alpha is reduced with + the inverse of the destination alpha, is merged with the + destination, whose alpha is reduced by the inverse of the source + alpha. CompositionMode_Xor is not the same as the bitwise Xor. + + \value CompositionMode_Plus Both the alpha and color of the source + and destination pixels are added together. + + \value CompositionMode_Multiply The output is the source color + multiplied by the destination. Multiplying a color with white + leaves the color unchanged, while multiplying a color + with black produces black. + + \value CompositionMode_Screen The source and destination colors + are inverted and then multiplied. Screening a color with white + produces white, whereas screening a color with black leaves the + color unchanged. + + \value CompositionMode_Overlay Multiplies or screens the colors + depending on the destination color. The destination color is mixed + with the source color to reflect the lightness or darkness of the + destination. + + \value CompositionMode_Darken The darker of the source and + destination colors is selected. + + \value CompositionMode_Lighten The lighter of the source and + destination colors is selected. + + \value CompositionMode_ColorDodge The destination color is + brightened to reflect the source color. A black source color + leaves the destination color unchanged. + + \value CompositionMode_ColorBurn The destination color is darkened + to reflect the source color. A white source color leaves the + destination color unchanged. + + \value CompositionMode_HardLight Multiplies or screens the colors + depending on the source color. A light source color will lighten + the destination color, whereas a dark source color will darken the + destination color. + + \value CompositionMode_SoftLight Darkens or lightens the colors + depending on the source color. Similar to + CompositionMode_HardLight. + + \value CompositionMode_Difference Subtracts the darker of the + colors from the lighter. Painting with white inverts the + destination color, whereas painting with black leaves the + destination color unchanged. + + \value CompositionMode_Exclusion Similar to + CompositionMode_Difference, but with a lower contrast. Painting + with white inverts the destination color, whereas painting with + black leaves the destination color unchanged. + + \value RasterOp_SourceOrDestination Does a bitwise OR operation on + the source and destination pixels (src OR dst). + + \value RasterOp_SourceAndDestination Does a bitwise AND operation + on the source and destination pixels (src AND dst). + + \value RasterOp_SourceXorDestination Does a bitwise XOR operation + on the source and destination pixels (src XOR dst). + + \value RasterOp_NotSourceAndNotDestination Does a bitwise NOR + operation on the source and destination pixels ((NOT src) AND (NOT + dst)). + + \value RasterOp_NotSourceOrNotDestination Does a bitwise NAND + operation on the source and destination pixels ((NOT src) OR (NOT + dst)). + + \value RasterOp_NotSourceXorDestination Does a bitwise operation + where the source pixels are inverted and then XOR'ed with the + destination ((NOT src) XOR dst). + + \value RasterOp_NotSource Does a bitwise operation where the + source pixels are inverted (NOT src). + + \value RasterOp_NotSourceAndDestination Does a bitwise operation + where the source is inverted and then AND'ed with the destination + ((NOT src) AND dst). + + \value RasterOp_SourceAndNotDestination Does a bitwise operation + where the source is AND'ed with the inverted destination pixels + (src AND (NOT dst)). + + \sa compositionMode(), setCompositionMode(), {QPainter#Composition + Modes}{Composition Modes}, {Image Composition Example} +*/ + +/*! + Sets the composition mode to the given \a mode. + + \warning You can only set the composition mode for QPainter + objects that operates on a QImage. + + \sa compositionMode() +*/ +void QPainter::setCompositionMode(CompositionMode mode) +{ + Q_D(QPainter); + if (!d->engine) { + qWarning("QPainter::setCompositionMode: Painter not active"); + return; + } + if (d->extended) { + d->state->composition_mode = mode; + d->extended->compositionModeChanged(); + return; + } + + if (mode >= QPainter::RasterOp_SourceOrDestination) { + if (!d->engine->hasFeature(QPaintEngine::RasterOpModes)) { + qWarning("QPainter::setCompositionMode: " + "Raster operation modes not supported on device"); + return; + } + } else if (mode >= QPainter::CompositionMode_Plus) { + if (!d->engine->hasFeature(QPaintEngine::BlendModes)) { + qWarning("QPainter::setCompositionMode: " + "Blend modes not supported on device"); + return; + } + } else if (!d->engine->hasFeature(QPaintEngine::PorterDuff)) { + if (mode != CompositionMode_Source && mode != CompositionMode_SourceOver) { + qWarning("QPainter::setCompositionMode: " + "PorterDuff modes not supported on device"); + return; + } + } + + d->state->composition_mode = mode; + d->state->dirtyFlags |= QPaintEngine::DirtyCompositionMode; +} + +/*! + Returns the current composition mode. + + \sa CompositionMode, setCompositionMode() +*/ +QPainter::CompositionMode QPainter::compositionMode() const +{ + Q_D(const QPainter); + if (!d->engine) { + qWarning("QPainter::compositionMode: Painter not active"); + return QPainter::CompositionMode_SourceOver; + } + return d->state->composition_mode; +} + +/*! + Returns the current background brush. + + \sa setBackground(), {QPainter#Settings}{Settings} +*/ + +const QBrush &QPainter::background() const +{ + Q_D(const QPainter); + if (!d->engine) { + qWarning("QPainter::background: Painter not active"); + return d->fakeState()->brush; + } + return d->state->bgBrush; +} + + +/*! + Returns true if clipping has been set; otherwise returns false. + + \sa setClipping(), {QPainter#Clipping}{Clipping} +*/ + +bool QPainter::hasClipping() const +{ + Q_D(const QPainter); + if (!d->engine) { + qWarning("QPainter::hasClipping: Painter not active"); + return false; + } + return d->state->clipEnabled && d->state->clipOperation != Qt::NoClip; +} + + +/*! + Enables clipping if \a enable is true, or disables clipping if \a + enable is false. + + \sa hasClipping(), {QPainter#Clipping}{Clipping} +*/ + +void QPainter::setClipping(bool enable) +{ + Q_D(QPainter); +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::setClipping(), enable=%s, was=%s\n", + enable ? "on" : "off", + hasClipping() ? "on" : "off"); +#endif + if (!d->engine) { + qWarning("QPainter::setClipping: Painter not active, state will be reset by begin"); + return; + } + + if (hasClipping() == enable) + return; + + // we can't enable clipping if we don't have a clip + if (enable + && (d->state->clipInfo.isEmpty() || d->state->clipInfo.last().operation == Qt::NoClip)) + return; + d->state->clipEnabled = enable; + + if (d->extended) { + d->extended->clipEnabledChanged(); + return; + } + + d->state->dirtyFlags |= QPaintEngine::DirtyClipEnabled; + d->updateState(d->state); +} + + +/*! + Returns the currently set clip region. Note that the clip region + is given in logical coordinates. + + \sa setClipRegion(), clipPath(), setClipping() +*/ + +QRegion QPainter::clipRegion() const +{ + Q_D(const QPainter); + if (!d->engine) { + qWarning("QPainter::clipRegion: Painter not active"); + return QRegion(); + } + + QRegion region; + bool lastWasNothing = true; + + if (!d->txinv) + const_cast<QPainter *>(this)->d_ptr->updateInvMatrix(); + + // ### Falcon: Use QPainterPath + for (int i=0; i<d->state->clipInfo.size(); ++i) { + const QPainterClipInfo &info = d->state->clipInfo.at(i); + QRegion other; + switch (info.clipType) { + + case QPainterClipInfo::RegionClip: { + QTransform matrix = (info.matrix * d->invMatrix); + if (lastWasNothing) { + region = info.region * matrix; + lastWasNothing = false; + continue; + } + if (info.operation == Qt::IntersectClip) + region &= info.region * matrix; + else if (info.operation == Qt::UniteClip) + region |= info.region * matrix; + else if (info.operation == Qt::NoClip) { + lastWasNothing = true; + region = QRegion(); + } else + region = info.region * matrix; + break; + } + + case QPainterClipInfo::PathClip: { + QTransform matrix = (info.matrix * d->invMatrix); + if (lastWasNothing) { + region = QRegion((info.path * matrix).toFillPolygon().toPolygon(), + info.path.fillRule()); + lastWasNothing = false; + continue; + } + if (info.operation == Qt::IntersectClip) { + region &= QRegion((info.path * matrix).toFillPolygon().toPolygon(), + info.path.fillRule()); + } else if (info.operation == Qt::UniteClip) { + region |= QRegion((info.path * matrix).toFillPolygon().toPolygon(), + info.path.fillRule()); + } else if (info.operation == Qt::NoClip) { + lastWasNothing = true; + region = QRegion(); + } else { + region = QRegion((info.path * matrix).toFillPolygon().toPolygon(), + info.path.fillRule()); + } + break; + } + + case QPainterClipInfo::RectClip: { + QTransform matrix = (info.matrix * d->invMatrix); + if (lastWasNothing) { + region = QRegion(info.rect) * matrix; + lastWasNothing = false; + continue; + } + if (info.operation == Qt::IntersectClip) + region &= QRegion(info.rect) * matrix; + else if (info.operation == Qt::UniteClip) + region |= QRegion(info.rect) * matrix; + else if (info.operation == Qt::NoClip) { + lastWasNothing = true; + region = QRegion(); + } else + region = QRegion(info.rect) * matrix; + break; + } + + case QPainterClipInfo::RectFClip: { + QTransform matrix = (info.matrix * d->invMatrix); + if (lastWasNothing) { + region = QRegion(info.rectf.toRect()) * matrix; + lastWasNothing = false; + continue; + } + if (info.operation == Qt::IntersectClip) + region &= QRegion(info.rectf.toRect()) * matrix; + else if (info.operation == Qt::UniteClip) + region |= QRegion(info.rectf.toRect()) * matrix; + else if (info.operation == Qt::NoClip) { + lastWasNothing = true; + region = QRegion(); + } else + region = QRegion(info.rectf.toRect()) * matrix; + break; + } + } + } + + return region; +} + +/*! + Returns the currently clip as a path. Note that the clip path is + given in logical coordinates. + + \sa setClipPath(), clipRegion(), setClipping() +*/ +QPainterPath QPainter::clipPath() const +{ + Q_D(const QPainter); + + // ### Since we do not support path intersections and path unions yet, + // we just use clipRegion() here... + if (!d->engine) { + qWarning("QPainter::clipPath: Painter not active"); + return QPainterPath(); + } + + // No clip, return empty + if (d->state->clipInfo.size() == 0) { + return QPainterPath(); + } else { + + // Update inverse matrix, used below. + if (!d->txinv) + const_cast<QPainter *>(this)->d_ptr->updateInvMatrix(); + + // For the simple case avoid conversion. + if (d->state->clipInfo.size() == 1 + && d->state->clipInfo.at(0).clipType == QPainterClipInfo::PathClip) { + QTransform matrix = (d->state->clipInfo.at(0).matrix * d->invMatrix); + return d->state->clipInfo.at(0).path * matrix; + + } else if (d->state->clipInfo.size() == 1 + && d->state->clipInfo.at(0).clipType == QPainterClipInfo::RectClip) { + QTransform matrix = (d->state->clipInfo.at(0).matrix * d->invMatrix); + QPainterPath path; + path.addRect(d->state->clipInfo.at(0).rect); + return path * matrix; + } else { + // Fallback to clipRegion() for now, since we don't have isect/unite for paths + extern QPainterPath qt_regionToPath(const QRegion ®ion); + return qt_regionToPath(clipRegion()); + } + } +} + +/*! + \fn void QPainter::setClipRect(const QRectF &rectangle, Qt::ClipOperation operation) + + Enables clipping, and sets the clip region to the given \a + rectangle using the given clip \a operation. The default operation + is to replace the current clip rectangle. + + Note that the clip rectangle is specified in logical (painter) + coordinates. + + \sa clipRegion(), setClipping(), {QPainter#Clipping}{Clipping} +*/ +void QPainter::setClipRect(const QRectF &rect, Qt::ClipOperation op) +{ + Q_D(QPainter); + + if (d->extended) { + if (!d->engine) { + qWarning("QPainter::setClipRect: Painter not active"); + return; + } + qreal right = rect.x() + rect.width(); + qreal bottom = rect.y() + rect.height(); + qreal pts[] = { rect.x(), rect.y(), + right, rect.y(), + right, bottom, + rect.x(), bottom }; + QVectorPath vp(pts, 4, 0, QVectorPath::RectangleHint); + d->state->clipEnabled = true; + d->extended->clip(vp, op); + d->state->clipInfo << QPainterClipInfo(rect, op, combinedTransform()); + d->state->clipOperation = op; + return; + } + + if (qreal(int(rect.top())) == rect.top() + && qreal(int(rect.bottom())) == rect.bottom() + && qreal(int(rect.left())) == rect.left() + && qreal(int(rect.right())) == rect.right()) + { + setClipRect(rect.toRect(), op); + return; + } + + if (rect.isEmpty()) { + setClipRegion(QRegion(), op); + return; + } + + QPainterPath path; + path.addRect(rect); + setClipPath(path, op); +} + +/*! + \fn void QPainter::setClipRect(const QRect &rectangle, Qt::ClipOperation operation) + \overload + + Enables clipping, and sets the clip region to the given \a rectangle using the given + clip \a operation. +*/ +void QPainter::setClipRect(const QRect &rect, Qt::ClipOperation op) +{ + Q_D(QPainter); + + if (!d->engine) { + qWarning("QPainter::setClipRect: Painter not active"); + return; + } + + if (d->extended) { + d->state->clipEnabled = true; + d->extended->clip(rect, op); + d->state->clipInfo << QPainterClipInfo(rect, op, combinedTransform()); + d->state->clipOperation = op; + return; + } + + if (!hasClipping() && (op == Qt::IntersectClip || op == Qt::UniteClip)) + op = Qt::ReplaceClip; + + d->state->clipRegion = rect; + d->state->clipOperation = op; + if (op == Qt::NoClip || op == Qt::ReplaceClip) + d->state->clipInfo.clear(); + d->state->clipInfo << QPainterClipInfo(rect, op, combinedTransform()); + d->state->clipEnabled = true; + d->state->dirtyFlags |= QPaintEngine::DirtyClipRegion | QPaintEngine::DirtyClipEnabled; + d->updateState(d->state); +} + +/*! + \fn void QPainter::setClipRect(int x, int y, int width, int height, Qt::ClipOperation operation) + + Enables clipping, and sets the clip region to the rectangle beginning at (\a x, \a y) + with the given \a width and \a height. +*/ + +/*! + \fn void QPainter::setClipRegion(const QRegion ®ion, Qt::ClipOperation operation) + + Sets the clip region to the given \a region using the specified clip + \a operation. The default clip operation is to replace the current + clip region. + + Note that the clip region is given in logical coordinates. + + \sa clipRegion(), setClipRect(), {QPainter#Clipping}{Clipping} +*/ +void QPainter::setClipRegion(const QRegion &r, Qt::ClipOperation op) +{ + Q_D(QPainter); +#ifdef QT_DEBUG_DRAW + QRect rect = r.boundingRect(); + if (qt_show_painter_debug_output) + printf("QPainter::setClipRegion(), size=%d, [%d,%d,%d,%d]\n", + r.rects().size(), rect.x(), rect.y(), rect.width(), rect.height()); +#endif + if (!d->engine) { + qWarning("QPainter::setClipRegion: Painter not active"); + return; + } + + if (d->extended) { + d->state->clipEnabled = true; + d->extended->clip(r, op); + d->state->clipInfo << QPainterClipInfo(r, op, combinedTransform()); + d->state->clipOperation = op; + return; + } + + if (!hasClipping() && (op == Qt::IntersectClip || op == Qt::UniteClip)) + op = Qt::ReplaceClip; + + d->state->clipRegion = r; + d->state->clipOperation = op; + if (op == Qt::NoClip || op == Qt::ReplaceClip) + d->state->clipInfo.clear(); + d->state->clipInfo << QPainterClipInfo(r, op, combinedTransform()); + d->state->clipEnabled = true; + d->state->dirtyFlags |= QPaintEngine::DirtyClipRegion | QPaintEngine::DirtyClipEnabled; + d->updateState(d->state); +} + +/*! + \since 4.2 + + Sets the transformation matrix to \a matrix and enables transformations. + + \note It is advisable to use setWorldTransform() instead of this function to + preserve the properties of perspective transformations. + + If \a combine is true, then \a matrix is combined with the current + transformation matrix; otherwise \a matrix replaces the current + transformation matrix. + + If \a matrix is the identity matrix and \a combine is false, this + function calls setWorldMatrixEnabled(false). (The identity matrix is the + matrix where QMatrix::m11() and QMatrix::m22() are 1.0 and the + rest are 0.0.) + + The following functions can transform the coordinate system without using + a QMatrix: + \list + \i translate() + \i scale() + \i shear() + \i rotate() + \endlist + + They operate on the painter's worldMatrix() and are implemented like this: + + \snippet doc/src/snippets/code/src_gui_painting_qpainter.cpp 4 + + Note that when using setWorldMatrix() function you should always have + \a combine be true when you are drawing into a QPicture. Otherwise + it may not be possible to replay the picture with additional + transformations; using the translate(), scale(), etc. convenience + functions is safe. + + For more information about the coordinate system, transformations + and window-viewport conversion, see \l {The Coordinate System} + documentation. + + \sa worldMatrixEnabled(), QMatrix +*/ + +void QPainter::setWorldMatrix(const QMatrix &matrix, bool combine) +{ + setWorldTransform(QTransform(matrix), combine); +} + +/*! + \since 4.2 + + Returns the world transformation matrix. + + It is advisable to use worldTransform() because worldMatrix() does not + preserve the properties of perspective transformations. + + \sa {QPainter#Coordinate Transformations}{Coordinate Transformations}, + {The Coordinate System} +*/ + +const QMatrix &QPainter::worldMatrix() const +{ + Q_D(const QPainter); + if (!d->engine) { + qWarning("QPainter::worldMatrix: Painter not active"); + return d->fakeState()->transform.toAffine(); + } + return d->state->worldMatrix.toAffine(); +} + +/*! + \obsolete + + Use setWorldTransform() instead. + + \sa setWorldTransform() +*/ + +void QPainter::setMatrix(const QMatrix &matrix, bool combine) +{ + setWorldTransform(QTransform(matrix), combine); +} + +/*! + \obsolete + + Use worldTransform() instead. + + \sa worldTransform() +*/ + +const QMatrix &QPainter::matrix() const +{ + return worldMatrix(); +} + + +/*! + \since 4.2 + + Returns the transformation matrix combining the current + window/viewport and world transformation. + + It is advisable to use combinedTransform() instead of this + function to preserve the properties of perspective transformations. + + \sa setWorldMatrix(), setWindow(), setViewport() +*/ +QMatrix QPainter::combinedMatrix() const +{ + return combinedTransform().toAffine(); +} + + +/*! + Returns the matrix that transforms from logical coordinates to + device coordinates of the platform dependent paint device. + + \note It is advisable to use deviceTransform() instead of this + function to preserve the properties of perspective transformations. + + This function is \e only needed when using platform painting + commands on the platform dependent handle (Qt::HANDLE), and the + platform does not do transformations nativly. + + The QPaintEngine::PaintEngineFeature enum can be queried to + determine whether the platform performs the transformations or + not. + + \sa worldMatrix(), QPaintEngine::hasFeature(), +*/ +const QMatrix &QPainter::deviceMatrix() const +{ + Q_D(const QPainter); + if (!d->engine) { + qWarning("QPainter::deviceMatrix: Painter not active"); + return d->fakeState()->transform.toAffine(); + } + return d->state->matrix.toAffine(); +} + +/*! + Resets any transformations that were made using translate(), scale(), + shear(), rotate(), setWorldMatrix(), setViewport() and + setWindow(). + + It is advisable to use resetTransform() instead of this function + to preserve the properties of perspective transformations. + + \sa {QPainter#Coordinate Transformations}{Coordinate + Transformations} +*/ + +void QPainter::resetMatrix() +{ + resetTransform(); +} + + +/*! + \since 4.2 + + Enables transformations if \a enable is true, or disables + transformations if \a enable is false. The world transformation + matrix is not changed. + + \sa worldMatrixEnabled(), worldMatrix(), {QPainter#Coordinate + Transformations}{Coordinate Transformations} +*/ + +void QPainter::setWorldMatrixEnabled(bool enable) +{ + Q_D(QPainter); +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::setMatrixEnabled(), enable=%d\n", enable); +#endif + + if (!d->engine) { + qWarning("QPainter::setMatrixEnabled: Painter not active"); + return; + } + if (enable == d->state->WxF) + return; + + d->state->WxF = enable; + d->updateMatrix(); +} + +/*! + \since 4.2 + + Returns true if world transformation is enabled; otherwise returns + false. + + \sa setWorldMatrixEnabled(), worldMatrix(), {The Coordinate System} +*/ + +bool QPainter::worldMatrixEnabled() const +{ + Q_D(const QPainter); + if (!d->engine) { + qWarning("QPainter::worldMatrixEnabled: Painter not active"); + return false; + } + return d->state->WxF; +} + +/*! + \obsolete + + Use setWorldMatrixEnabled() instead. + + \sa setWorldMatrixEnabled() +*/ + +void QPainter::setMatrixEnabled(bool enable) +{ + setWorldMatrixEnabled(enable); +} + +/*! + \obsolete + + Use worldMatrixEnabled() instead + + \sa worldMatrixEnabled() +*/ + +bool QPainter::matrixEnabled() const +{ + return worldMatrixEnabled(); +} + +/*! + Scales the coordinate system by (\a{sx}, \a{sy}). + + \sa setWorldMatrix() {QPainter#Coordinate Transformations}{Coordinate + Transformations} +*/ + +void QPainter::scale(qreal sx, qreal sy) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::scale(), sx=%f, sy=%f\n", sx, sy); +#endif + Q_D(QPainter); + if (!d->engine) { + qWarning("QPainter::scale: Painter not active"); + return; + } + + d->state->worldMatrix.scale(sx,sy); + d->state->WxF = true; + d->updateMatrix(); +} + +/*! + Shears the coordinate system by (\a{sh}, \a{sv}). + + \sa setWorldMatrix(), {QPainter#Coordinate Transformations}{Coordinate + Transformations} +*/ + +void QPainter::shear(qreal sh, qreal sv) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::shear(), sh=%f, sv=%f\n", sh, sv); +#endif + Q_D(QPainter); + if (!d->engine) { + qWarning("QPainter::shear: Painter not active"); + return; + } + + d->state->worldMatrix.shear(sh, sv); + d->state->WxF = true; + d->updateMatrix(); +} + +/*! + \fn void QPainter::rotate(qreal angle) + + Rotates the coordinate system the given \a angle clockwise. + + \sa setWorldMatrix(), {QPainter#Coordinate Transformations}{Coordinate + Transformations} +*/ + +void QPainter::rotate(qreal a) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::rotate(), angle=%f\n", a); +#endif + Q_D(QPainter); + if (!d->engine) { + qWarning("QPainter::rotate: Painter not active"); + return; + } + + d->state->worldMatrix.rotate(a); + d->state->WxF = true; + d->updateMatrix(); +} + +/*! + Translates the coordinate system by the given \a offset; i.e. the + given \a offset is added to points. + + \sa setWorldMatrix(), {QPainter#Coordinate Transformations}{Coordinate + Transformations} +*/ +void QPainter::translate(const QPointF &offset) +{ + qreal dx = offset.x(); + qreal dy = offset.y(); +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::translate(), dx=%f, dy=%f\n", dx, dy); +#endif + Q_D(QPainter); + if (!d->engine) { + qWarning("QPainter::translate: Painter not active"); + return; + } + + d->state->worldMatrix.translate(dx, dy); + d->state->WxF = true; + d->updateMatrix(); +} + +/*! + \fn void QPainter::translate(const QPoint &offset) + \overload + + Translates the coordinate system by the given \a offset. +*/ + +/*! + \fn void QPainter::translate(qreal dx, qreal dy) + \overload + + Translates the coordinate system by the vector (\a dx, \a dy). +*/ + +/*! + \fn void QPainter::setClipPath(const QPainterPath &path, Qt::ClipOperation operation) + + Enables clipping, and sets the clip path for the painter to the + given \a path, with the clip \a operation. + + Note that the clip path is specified in logical (painter) + coordinates. + + \sa clipPath(), clipRegion(), {QPainter#Clipping}{Clipping} + +*/ +void QPainter::setClipPath(const QPainterPath &path, Qt::ClipOperation op) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) { + QRectF b = path.boundingRect(); + printf("QPainter::setClipPath(), size=%d, op=%d, bounds=[%.2f,%.2f,%.2f,%.2f]\n", + path.elementCount(), op, b.x(), b.y(), b.width(), b.height()); + } +#endif + Q_D(QPainter); + + if (!d->engine) { + qWarning("QPainter::setClipPath: Painter not active"); + return; + } + + if (d->extended) { + d->state->clipEnabled = true; + d->extended->clip(path, op); + d->state->clipInfo << QPainterClipInfo(path, op, combinedTransform()); + d->state->clipOperation = op; + return; + } + + + + if (!hasClipping() && (op == Qt::IntersectClip || op == Qt::UniteClip)) + op = Qt::ReplaceClip; + + d->state->clipPath = path; + d->state->clipOperation = op; + if (op == Qt::NoClip || op == Qt::ReplaceClip) + d->state->clipInfo.clear(); + d->state->clipInfo << QPainterClipInfo(path, op, combinedTransform()); + d->state->clipEnabled = true; + d->state->dirtyFlags |= QPaintEngine::DirtyClipPath | QPaintEngine::DirtyClipEnabled; + d->updateState(d->state); +} + +/*! + Draws the outline (strokes) the path \a path with the pen specified + by \a pen + + \sa fillPath(), {QPainter#Drawing}{Drawing} +*/ +void QPainter::strokePath(const QPainterPath &path, const QPen &pen) +{ + Q_D(QPainter); + + if (!d->engine) { + qWarning("QPainter::strokePath: Painter not active"); + return; + } + + if (d->extended) { + const QGradient *g = qpen_brush(pen).gradient(); + if (!g || g->coordinateMode() == QGradient::LogicalMode) { + d->extended->stroke(qtVectorPathForPath(path), pen); + return; + } + } + + QBrush oldBrush = d->state->brush; + QPen oldPen = d->state->pen; + + setPen(pen); + setBrush(Qt::NoBrush); + + drawPath(path); + + // Reset old state + setPen(oldPen); + setBrush(oldBrush); +} + +/*! + Fills the given \a path using the given \a brush. The outline is + not drawn. + + Alternatively, you can specify a QColor instead of a QBrush; the + QBrush constructor (taking a QColor argument) will automatically + create a solid pattern brush. + + \sa drawPath() +*/ +void QPainter::fillPath(const QPainterPath &path, const QBrush &brush) +{ + Q_D(QPainter); + + if (!d->engine) { + qWarning("QPainter::fillPath: Painter not active"); + return; + } + + if (d->extended) { + const QGradient *g = brush.gradient(); + if (!g || g->coordinateMode() == QGradient::LogicalMode) { + d->extended->fill(qtVectorPathForPath(path), brush); + return; + } + } + + QBrush oldBrush = d->state->brush; + QPen oldPen = d->state->pen; + + setPen(Qt::NoPen); + setBrush(brush); + + drawPath(path); + + // Reset old state + setPen(oldPen); + setBrush(oldBrush); +} + +/*! + Draws the given painter \a path using the current pen for outline + and the current brush for filling. + + \table 100% + \row + \o \inlineimage qpainter-path.png + \o + \snippet doc/src/snippets/code/src_gui_painting_qpainter.cpp 5 + \endtable + + \sa {painting/painterpaths}{the Painter Paths + example},{demos/deform}{the Vector Deformation demo} +*/ +void QPainter::drawPath(const QPainterPath &path) +{ +#ifdef QT_DEBUG_DRAW + QRectF pathBounds = path.boundingRect(); + if (qt_show_painter_debug_output) + printf("QPainter::drawPath(), size=%d, [%.2f,%.2f,%.2f,%.2f]\n", + path.elementCount(), + pathBounds.x(), pathBounds.y(), pathBounds.width(), pathBounds.height()); +#endif + + Q_D(QPainter); + + if (!d->engine) { + qWarning("QPainter::drawPath: Painter not active"); + return; + } + + if (d->extended) { + d->extended->drawPath(path); + return; + } + d->updateState(d->state); + + if (d->engine->hasFeature(QPaintEngine::PainterPaths) && d->state->emulationSpecifier == 0) { + d->engine->drawPath(path); + } else { + d->draw_helper(path); + } +} + +/*! + \fn void QPainter::drawLine(const QLineF &line) + + Draws a line defined by \a line. + + \table 100% + \row + \o \inlineimage qpainter-line.png + \o + \snippet doc/src/snippets/code/src_gui_painting_qpainter.cpp 6 + \endtable + + \sa drawLines(), drawPolyline(), {The Coordinate System} +*/ + +/*! + \fn void QPainter::drawLine(const QLine &line) + \overload + + Draws a line defined by \a line. +*/ + +/*! + \fn void QPainter::drawLine(const QPoint &p1, const QPoint &p2) + \overload + + Draws a line from \a p1 to \a p2. +*/ + +/*! + \fn void QPainter::drawLine(const QPointF &p1, const QPointF &p2) + \overload + + Draws a line from \a p1 to \a p2. +*/ + +/*! + \fn void QPainter::drawLine(int x1, int y1, int x2, int y2) + \overload + + Draws a line from (\a x1, \a y1) to (\a x2, \a y2) and sets the + current pen position to (\a x2, \a y2). +*/ + +/*! + \fn void QPainter::drawRect(const QRectF &rectangle) + + Draws the current \a rectangle with the current pen and brush. + + A filled rectangle has a size of \a{rectangle}.size(). A stroked + rectangle has a size of \a{rectangle}.size() plus the pen width. + + \table 100% + \row + \o \inlineimage qpainter-rectangle.png + \o + \snippet doc/src/snippets/code/src_gui_painting_qpainter.cpp 7 + \endtable + + \sa drawRects(), drawPolygon(), {The Coordinate System} +*/ + +/*! + \fn void QPainter::drawRect(const QRect &rectangle) + + \overload + + Draws the current \a rectangle with the current pen and brush. +*/ + +/*! + \fn void QPainter::drawRect(int x, int y, int width, int height) + + \overload + + Draws a rectangle with upper left corner at (\a{x}, \a{y}) and + with the given \a width and \a height. +*/ + +/*! + \fn void QPainter::drawRects(const QRectF *rectangles, int rectCount) + + Draws the first \a rectCount of the given \a rectangles using the + current pen and brush. + + \sa drawRect() +*/ +void QPainter::drawRects(const QRectF *rects, int rectCount) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::drawRects(), count=%d\n", rectCount); +#endif + Q_D(QPainter); + + if (!d->engine) { + qWarning("QPainter::drawRects: Painter not active"); + return; + } + + if (rectCount <= 0) + return; + + if (d->extended) { + d->extended->drawRects(rects, rectCount); + return; + } + + d->updateState(d->state); + + if (!d->state->emulationSpecifier) { + d->engine->drawRects(rects, rectCount); + return; + } + + if (d->state->emulationSpecifier == QPaintEngine::PrimitiveTransform + && d->state->matrix.type() == QTransform::TxTranslate) { + for (int i=0; i<rectCount; ++i) { + QRectF r(rects[i].x() + d->state->matrix.dx(), + rects[i].y() + d->state->matrix.dy(), + rects[i].width(), + rects[i].height()); + d->engine->drawRects(&r, 1); + } + } else { + if (d->state->brushNeedsResolving() || d->state->penNeedsResolving()) { + for (int i=0; i<rectCount; ++i) { + QPainterPath rectPath; + rectPath.addRect(rects[i]); + d->draw_helper(rectPath, QPainterPrivate::StrokeAndFillDraw); + } + } else { + QPainterPath rectPath; + for (int i=0; i<rectCount; ++i) + rectPath.addRect(rects[i]); + d->draw_helper(rectPath, QPainterPrivate::StrokeAndFillDraw); + } + } +} + +/*! + \fn void QPainter::drawRects(const QRect *rectangles, int rectCount) + \overload + + Draws the first \a rectCount of the given \a rectangles using the + current pen and brush. +*/ +void QPainter::drawRects(const QRect *rects, int rectCount) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::drawRects(), count=%d\n", rectCount); +#endif + Q_D(QPainter); + + if (!d->engine) { + qWarning("QPainter::drawRects: Painter not active"); + return; + } + + if (rectCount <= 0) + return; + + if (d->extended) { + d->extended->drawRects(rects, rectCount); + return; + } + + d->updateState(d->state); + + if (!d->state->emulationSpecifier) { + d->engine->drawRects(rects, rectCount); + return; + } + + if (d->state->emulationSpecifier == QPaintEngine::PrimitiveTransform + && d->state->matrix.type() == QTransform::TxTranslate) { + for (int i=0; i<rectCount; ++i) { + QRectF r(rects[i].x() + d->state->matrix.dx(), + rects[i].y() + d->state->matrix.dy(), + rects[i].width(), + rects[i].height()); + + d->engine->drawRects(&r, 1); + } + } else { + if (d->state->brushNeedsResolving() || d->state->penNeedsResolving()) { + for (int i=0; i<rectCount; ++i) { + QPainterPath rectPath; + rectPath.addRect(rects[i]); + d->draw_helper(rectPath, QPainterPrivate::StrokeAndFillDraw); + } + } else { + QPainterPath rectPath; + for (int i=0; i<rectCount; ++i) + rectPath.addRect(rects[i]); + + d->draw_helper(rectPath, QPainterPrivate::StrokeAndFillDraw); + } + } +} + +/*! + \fn void QPainter::drawRects(const QVector<QRectF> &rectangles) + \overload + + Draws the given \a rectangles using the current pen and brush. +*/ + +/*! + \fn void QPainter::drawRects(const QVector<QRect> &rectangles) + + \overload + + Draws the given \a rectangles using the current pen and brush. +*/ + +/*! + \fn void QPainter::drawPoint(const QPointF &position) + + Draws a single point at the given \a position using the current + pen's color. + + \sa {The Coordinate System} +*/ + +/*! + \fn void QPainter::drawPoint(const QPoint &position) + \overload + + Draws a single point at the given \a position using the current + pen's color. +*/ + +/*! \fn void QPainter::drawPoint(int x, int y) + + \overload + + Draws a single point at position (\a x, \a y). +*/ + +/*! + Draws the first \a pointCount points in the array \a points using + the current pen's color. + + \sa {The Coordinate System} +*/ +void QPainter::drawPoints(const QPointF *points, int pointCount) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::drawPoints(), count=%d\n", pointCount); +#endif + Q_D(QPainter); + + if (!d->engine) { + qWarning("QPainter::drawPoints: Painter not active"); + return; + } + + if (pointCount <= 0) + return; + + if (d->extended) { + d->extended->drawPoints(points, pointCount); + return; + } + + d->updateState(d->state); + + if (!d->state->emulationSpecifier) { + d->engine->drawPoints(points, pointCount); + return; + } + + if (d->state->emulationSpecifier == QPaintEngine::PrimitiveTransform + && d->state->matrix.type() == QTransform::TxTranslate) { + // ### use drawPoints function + for (int i=0; i<pointCount; ++i) { + QPointF pt(points[i].x() + d->state->matrix.dx(), + points[i].y() + d->state->matrix.dy()); + d->engine->drawPoints(&pt, 1); + } + } else { + QPen pen = d->state->pen; + bool flat_pen = pen.capStyle() == Qt::FlatCap; + if (flat_pen) { + save(); + pen.setCapStyle(Qt::SquareCap); + setPen(pen); + } + QPainterPath path; + for (int i=0; i<pointCount; ++i) { + path.moveTo(points[i].x(), points[i].y()); + path.lineTo(points[i].x() + 0.0001, points[i].y()); + } + d->draw_helper(path, QPainterPrivate::StrokeDraw); + if (flat_pen) + restore(); + } +} + +/*! + \overload + + Draws the first \a pointCount points in the array \a points using + the current pen's color. +*/ + +void QPainter::drawPoints(const QPoint *points, int pointCount) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::drawPoints(), count=%d\n", pointCount); +#endif + Q_D(QPainter); + + if (!d->engine) { + qWarning("QPainter::drawPoints: Painter not active"); + return; + } + + if (pointCount <= 0) + return; + + if (d->extended) { + d->extended->drawPoints(points, pointCount); + return; + } + + d->updateState(d->state); + + if (!d->state->emulationSpecifier) { + d->engine->drawPoints(points, pointCount); + return; + } + + if (d->state->emulationSpecifier == QPaintEngine::PrimitiveTransform + && d->state->matrix.type() == QTransform::TxTranslate) { + // ### use drawPoints function + for (int i=0; i<pointCount; ++i) { + QPointF pt(points[i].x() + d->state->matrix.dx(), + points[i].y() + d->state->matrix.dy()); + d->engine->drawPoints(&pt, 1); + } + } else { + QPen pen = d->state->pen; + bool flat_pen = (pen.capStyle() == Qt::FlatCap); + if (flat_pen) { + save(); + pen.setCapStyle(Qt::SquareCap); + setPen(pen); + } + QPainterPath path; + for (int i=0; i<pointCount; ++i) { + path.moveTo(points[i].x(), points[i].y()); + path.lineTo(points[i].x() + 0.0001, points[i].y()); + } + d->draw_helper(path, QPainterPrivate::StrokeDraw); + if (flat_pen) + restore(); + } +} + +/*! + \fn void QPainter::drawPoints(const QPolygonF &points) + + \overload + + Draws the points in the vector \a points. +*/ + +/*! + \fn void QPainter::drawPoints(const QPolygon &points) + + \overload + + Draws the points in the vector \a points. +*/ + +/*! + \fn void QPainter::drawPoints(const QPolygon &polygon, int index, + int count) + + \overload + \compat + + Draws \a count points in the vector \a polygon starting on \a index + using the current pen. + + Use drawPoints() combined with QPolygon::constData() instead. + + \oldcode + QPainter painter(this); + painter.drawPoints(polygon, index, count); + \newcode + int pointCount = (count == -1) ? polygon.size() - index : count; + + QPainter painter(this); + painter.drawPoints(polygon.constData() + index, pointCount); + \endcode +*/ + +/*! + Sets the background mode of the painter to the given \a mode + + Qt::TransparentMode (the default) draws stippled lines and text + without setting the background pixels. Qt::OpaqueMode fills these + space with the current background color. + + Note that in order to draw a bitmap or pixmap transparently, you + must use QPixmap::setMask(). + + \sa backgroundMode(), setBackground(), + {QPainter#Settings}{Settings} +*/ + +void QPainter::setBackgroundMode(Qt::BGMode mode) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::setBackgroundMode(), mode=%d\n", mode); +#endif + + Q_D(QPainter); + if (!d->engine) { + qWarning("QPainter::setBackgroundMode: Painter not active"); + return; + } + if (d->state->bgMode == mode) + return; + + d->state->bgMode = mode; + if (d->extended) { + d->checkEmulation(); + } else { + d->state->dirtyFlags |= QPaintEngine::DirtyBackgroundMode; + } +} + +/*! + Returns the current background mode. + + \sa setBackgroundMode(), {QPainter#Settings}{Settings} +*/ +Qt::BGMode QPainter::backgroundMode() const +{ + Q_D(const QPainter); + if (!d->engine) { + qWarning("QPainter::backgroundMode: Painter not active"); + return Qt::TransparentMode; + } + return d->state->bgMode; +} + + +/*! + \overload + + Sets the painter's pen to have style Qt::SolidLine, width 0 and the + specified \a color. +*/ + +void QPainter::setPen(const QColor &color) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::setPen(), color=%04x\n", color.rgb()); +#endif + Q_D(QPainter); + if (!d->engine) { + qWarning("QPainter::setPen: Painter not active"); + return; + } + + if (d->state->pen.style() == Qt::SolidLine + && d->state->pen.widthF() == 0 + && d->state->pen.isSolid() + && d->state->pen.color() == color) + return; + + QPen pen(color.isValid() ? color : QColor(Qt::black), 0, Qt::SolidLine); + + d->state->pen = pen; + if (d->extended) + d->extended->penChanged(); + else + d->state->dirtyFlags |= QPaintEngine::DirtyPen; +} + +/*! + Sets the painter's pen to be the given \a pen. + + The \a pen defines how to draw lines and outlines, and it also + defines the text color. + + \sa pen(), {QPainter#Settings}{Settings} +*/ + +void QPainter::setPen(const QPen &pen) +{ + +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::setPen(), color=%04x, (brushStyle=%d) style=%d, cap=%d, join=%d\n", + pen.color().rgb(), pen.brush().style(), pen.style(), pen.capStyle(), pen.joinStyle()); +#endif + Q_D(QPainter); + if (!d->engine) { + qWarning("QPainter::setPen: Painter not active"); + return; + } + + if (d->state->pen == pen) + return; + + if (d->extended) { + d->state->pen = pen; + d->checkEmulation(); + d->extended->penChanged(); + return; + } + + // Do some checks to see if we are the same pen. + Qt::PenStyle currentStyle = d->state->pen.style(); + if (currentStyle == pen.style() && currentStyle != Qt::CustomDashLine) { + if (currentStyle == Qt::NoPen || + (d->state->pen.isSolid() && pen.isSolid() + && d->state->pen.color() == pen.color() + && d->state->pen.widthF() == pen.widthF() + && d->state->pen.capStyle() == pen.capStyle() + && d->state->pen.joinStyle() == pen.joinStyle() + && d->state->pen.isCosmetic() == pen.isCosmetic())) + return; + } + + d->state->pen = pen; + d->state->dirtyFlags |= QPaintEngine::DirtyPen; +} + +/*! + \overload + + Sets the painter's pen to have the given \a style, width 0 and + black color. +*/ + +void QPainter::setPen(Qt::PenStyle style) +{ + Q_D(QPainter); + if (!d->engine) { + qWarning("QPainter::setPen: Painter not active"); + return; + } + + if (d->state->pen.style() == style + && (style == Qt::NoPen || (d->state->pen.widthF() == 0 + && d->state->pen.isSolid() + && d->state->pen.color() == QColor(Qt::black)))) + return; + + // QPen(Qt::NoPen) is to avoid creating QPenData, including its brush (from the color) + // Note that this works well as long as QPen(Qt::NoPen) returns a black, zero-width pen + d->state->pen = (style == Qt::NoPen) ? QPen(Qt::NoPen) : QPen(Qt::black, 0, style); + + if (d->extended) + d->extended->penChanged(); + else + d->state->dirtyFlags |= QPaintEngine::DirtyPen; + +} + +/*! + Returns the painter's current pen. + + \sa setPen(), {QPainter#Settings}{Settings} +*/ + +const QPen &QPainter::pen() const +{ + Q_D(const QPainter); + if (!d->engine) { + qWarning("QPainter::pen: Painter not active"); + return d->fakeState()->pen; + } + return d->state->pen; +} + + +/*! + Sets the painter's brush to the given \a brush. + + The painter's brush defines how shapes are filled. + + \sa brush(), {QPainter#Settings}{Settings} +*/ + +void QPainter::setBrush(const QBrush &brush) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::setBrush(), color=%04x, style=%d\n", brush.color().rgb(), brush.style()); +#endif + Q_D(QPainter); + if (!d->engine) { + qWarning("QPainter::setBrush: Painter not active"); + return; + } + + if (d->state->brush.d == brush.d) + return; + + if (d->extended) { + d->state->brush = brush; + d->checkEmulation(); + d->extended->brushChanged(); + return; + } + + Qt::BrushStyle currentStyle = d->state->brush.style(); + if (currentStyle == brush.style()) { + if (currentStyle == Qt::NoBrush + || (currentStyle == Qt::SolidPattern + && d->state->brush.color() == brush.color())) + return; + } + + d->state->brush = brush; + d->state->dirtyFlags |= QPaintEngine::DirtyBrush; +} + + +/*! + \overload + + Sets the painter's brush to black color and the specified \a + style. +*/ + +void QPainter::setBrush(Qt::BrushStyle style) +{ + Q_D(QPainter); + if (!d->engine) { + qWarning("QPainter::setBrush: Painter not active"); + return; + } + if (d->state->brush.style() == style && + (style == Qt::NoBrush + || (style == Qt::SolidPattern && d->state->brush.color() == QColor(0, 0, 0)))) + return; + d->state->brush = QBrush(Qt::black, style); + if (d->extended) + d->extended->brushChanged(); + else + d->state->dirtyFlags |= QPaintEngine::DirtyBrush; +} + +/*! + Returns the painter's current brush. + + \sa QPainter::setBrush(), {QPainter#Settings}{Settings} +*/ + +const QBrush &QPainter::brush() const +{ + Q_D(const QPainter); + if (!d->engine) { + qWarning("QPainter::brush: Painter not active"); + return d->fakeState()->brush; + } + return d->state->brush; +} + +/*! + \fn void QPainter::setBackground(const QBrush &brush) + + Sets the background brush of the painter to the given \a brush. + + The background brush is the brush that is filled in when drawing + opaque text, stippled lines and bitmaps. The background brush has + no effect in transparent background mode (which is the default). + + \sa background(), setBackgroundMode(), + {QPainter#Settings}{Settings} +*/ + +void QPainter::setBackground(const QBrush &bg) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::setBackground(), color=%04x, style=%d\n", bg.color().rgb(), bg.style()); +#endif + + Q_D(QPainter); + if (!d->engine) { + qWarning("QPainter::setBackground: Painter not active"); + return; + } + d->state->bgBrush = bg; + if (!d->extended) + d->state->dirtyFlags |= QPaintEngine::DirtyBackground; +} + +/*! + Sets the painter's font to the given \a font. + + This font is used by subsequent drawText() functions. The text + color is the same as the pen color. + + If you set a font that isn't available, Qt finds a close match. + font() will return what you set using setFont() and fontInfo() returns the + font actually being used (which may be the same). + + \sa font(), drawText(), {QPainter#Settings}{Settings} +*/ + +void QPainter::setFont(const QFont &font) +{ + Q_D(QPainter); + +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::setFont(), family=%s, pointSize=%d\n", font.family().toLatin1().constData(), font.pointSize()); +#endif + + if (!d->engine) { + qWarning("QPainter::setFont: Painter not active"); + return; + } + + d->state->font = QFont(font.resolve(d->state->deviceFont), device()); + if (!d->extended) + d->state->dirtyFlags |= QPaintEngine::DirtyFont; +} + +/*! + Returns the currently set font used for drawing text. + + \sa setFont(), drawText(), {QPainter#Settings}{Settings} +*/ +const QFont &QPainter::font() const +{ + Q_D(const QPainter); + if (!d->engine) { + qWarning("QPainter::font: Painter not active"); + return d->fakeState()->font; + } + return d->state->font; +} + +/*! + \since 4.4 + + Draws the given rectangle \a rect with rounded corners. + + The \a xRadius and \a yRadius arguments specify the radii + of the ellipses defining the corners of the rounded rectangle. + When \a mode is Qt::RelativeSize, \a xRadius and + \a yRadius are specified in percentage of half the rectangle's + width and height respectively, and should be in the range + 0.0 to 100.0. + + A filled rectangle has a size of rect.size(). A stroked rectangle + has a size of rect.size() plus the pen width. + + \table 100% + \row + \o \inlineimage qpainter-roundrect.png + \o + \snippet doc/src/snippets/code/src_gui_painting_qpainter.cpp 8 + \endtable + + \sa drawRect(), QPen +*/ +// FALCON: Should we add a specialized method in QPaintEngineEx? +void QPainter::drawRoundedRect(const QRectF &rect, qreal xRadius, qreal yRadius, Qt::SizeMode mode) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::drawRoundedRect(), [%.2f,%.2f,%.2f,%.2f]\n", rect.x(), rect.y(), rect.width(), rect.height()); +#endif + Q_D(QPainter); + + if (!d->engine) + return; + + if (xRadius <= 0 || yRadius <= 0) { // draw normal rectangle + drawRect(rect); + return; + } + + if (d->extended) { + QPainterPath::ElementType types[] = { + QPainterPath::MoveToElement, + QPainterPath::LineToElement, + QPainterPath::CurveToElement, + QPainterPath::CurveToDataElement, + QPainterPath::CurveToDataElement, + QPainterPath::LineToElement, + QPainterPath::CurveToElement, + QPainterPath::CurveToDataElement, + QPainterPath::CurveToDataElement, + QPainterPath::LineToElement, + QPainterPath::CurveToElement, + QPainterPath::CurveToDataElement, + QPainterPath::CurveToDataElement, + QPainterPath::LineToElement, + QPainterPath::CurveToElement, + QPainterPath::CurveToDataElement, + QPainterPath::CurveToDataElement + }; + + qreal x1 = rect.left(); + qreal x2 = rect.right(); + qreal y1 = rect.top(); + qreal y2 = rect.bottom(); + + if (mode == Qt::RelativeSize) { + xRadius = xRadius * rect.width() / 200.; + yRadius = yRadius * rect.height() / 200.; + } + + xRadius = qMin(xRadius, rect.width() / 2); + yRadius = qMin(yRadius, rect.height() / 2); + + qreal pts[] = { + x1 + xRadius, y1, // MoveTo + x2 - xRadius, y1, // LineTo + x2 - (1 - KAPPA) * xRadius, y1, // CurveTo + x2, y1 + (1 - KAPPA) * yRadius, + x2, y1 + yRadius, + x2, y2 - yRadius, // LineTo + x2, y2 - (1 - KAPPA) * yRadius, // CurveTo + x2 - (1 - KAPPA) * xRadius, y2, + x2 - xRadius, y2, + x1 + xRadius, y2, // LineTo + x1 + (1 - KAPPA) * xRadius, y2, // CurveTo + x1, y2 - (1 - KAPPA) * yRadius, + x1, y2 - yRadius, + x1, y1 + yRadius, // LineTo + x1, y1 + KAPPA * yRadius, // CurveTo + x1 + (1 - KAPPA) * xRadius, y1, + x1 + xRadius, y1 + }; + + QVectorPath path(pts, 17, types); + d->extended->draw(path); + return; + } + + QPainterPath path; + path.addRoundedRect(rect, xRadius, yRadius, mode); + drawPath(path); +} + +/*! + \fn void QPainter::drawRoundedRect(const QRect &rect, qreal xRadius, qreal yRadius, + Qt::SizeMode mode = Qt::AbsoluteSize); + \since 4.4 + \overload + + Draws the given rectangle \a rect with rounded corners. +*/ + +/*! + \fn void QPainter::drawRoundedRect(int x, int y, int w, int h, qreal xRadius, qreal yRadius, + Qt::SizeMode mode = Qt::AbsoluteSize); + \since 4.4 + \overload + + Draws the given rectangle \a x, \a y, \a w, \a h with rounded corners. +*/ + +/*! + \obsolete + + Draws a rectangle \a r with rounded corners. + + The \a xRnd and \a yRnd arguments specify how rounded the corners + should be. 0 is angled corners, 99 is maximum roundedness. + + A filled rectangle has a size of r.size(). A stroked rectangle + has a size of r.size() plus the pen width. + + \sa drawRoundedRect() +*/ +void QPainter::drawRoundRect(const QRectF &r, int xRnd, int yRnd) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::drawRoundRectangle(), [%.2f,%.2f,%.2f,%.2f]\n", r.x(), r.y(), r.width(), r.height()); +#endif + Q_D(QPainter); + + if (!d->engine) + return; + + if(xRnd <= 0 || yRnd <= 0) { // draw normal rectangle + drawRect(r); + return; + } + + QPainterPath path; + path.addRoundRect(r, xRnd, yRnd); + drawPath(path); +} + + +/*! + \fn void QPainter::drawRoundRect(const QRect &r, int xRnd = 25, int yRnd = 25) + + \overload + \obsolete + + Draws the rectangle \a r with rounded corners. +*/ + +/*! + \obsolete + + \fn QPainter::drawRoundRect(int x, int y, int w, int h, int xRnd, int yRnd) + + \overload + + Draws the rectangle \a x, \a y, \a w, \a h with rounded corners. +*/ + +/*! + \fn void QPainter::drawEllipse(const QRectF &rectangle) + + Draws the ellipse defined by the given \a rectangle. + + A filled ellipse has a size of \a{rectangle}.\l + {QRect::size()}{size()}. A stroked ellipse has a size of + \a{rectangle}.\l {QRect::size()}{size()} plus the pen width. + + \table 100% + \row + \o \inlineimage qpainter-ellipse.png + \o + \snippet doc/src/snippets/code/src_gui_painting_qpainter.cpp 9 + \endtable + + \sa drawPie(), {The Coordinate System} +*/ +void QPainter::drawEllipse(const QRectF &r) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::drawEllipse(), [%.2f,%.2f,%.2f,%.2f]\n", r.x(), r.y(), r.width(), r.height()); +#endif + Q_D(QPainter); + + if (!d->engine) + return; + + QRectF rect(r.normalized()); + if (rect.isEmpty()) + return; + + if (d->extended) { + d->extended->drawEllipse(rect); + return; + } + + d->updateState(d->state); + if (d->state->emulationSpecifier) { + if (d->state->emulationSpecifier == QPaintEngine::PrimitiveTransform + && d->state->matrix.type() == QTransform::TxTranslate) { + rect.translate(QPointF(d->state->matrix.dx(), d->state->matrix.dy())); + } else { + QPainterPath path; + path.addEllipse(rect); + d->draw_helper(path, QPainterPrivate::StrokeAndFillDraw); + return; + } + } + + d->engine->drawEllipse(rect); +} + +/*! + \fn QPainter::drawEllipse(const QRect &rectangle) + + \overload + + Draws the ellipse defined by the given \a rectangle. +*/ +void QPainter::drawEllipse(const QRect &r) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::drawEllipse(), [%d,%d,%d,%d]\n", r.x(), r.y(), r.width(), r.height()); +#endif + Q_D(QPainter); + + if (!d->engine) + return; + + QRect rect(r.normalized()); + if (rect.isEmpty()) + return; + + if (d->extended) { + d->extended->drawEllipse(rect); + return; + } + + d->updateState(d->state); + + if (d->state->emulationSpecifier) { + if (d->state->emulationSpecifier == QPaintEngine::PrimitiveTransform + && d->state->matrix.type() == QTransform::TxTranslate) { + rect.translate(QPoint(qRound(d->state->matrix.dx()), qRound(d->state->matrix.dy()))); + } else { + QPainterPath path; + path.addEllipse(rect); + d->draw_helper(path, QPainterPrivate::StrokeAndFillDraw); + return; + } + } + + d->engine->drawEllipse(rect); +} + +/*! + \fn QPainter::drawEllipse(int x, int y, int width, int height) + + \overload + + Draws the ellipse defined by the rectangle beginning at (\a{x}, + \a{y}) with the given \a width and \a height. +*/ + +/*! + \since 4.4 + + \fn QPainter::drawEllipse(const QPointF ¢er, qreal rx, qreal ry) + + \overload + + Draws the ellipse positioned at \a{center} with radii \a{rx} and \a{ry}. +*/ + +/*! + \since 4.4 + + \fn QPainter::drawEllipse(const QPoint ¢er, int rx, int ry) + + \overload + + Draws the ellipse positioned at \a{center} with radii \a{rx} and \a{ry}. +*/ + +/*! + \fn void QPainter::drawArc(const QRectF &rectangle, int startAngle, int spanAngle) + + Draws the arc defined by the given \a rectangle, \a startAngle and + \a spanAngle. + + The \a startAngle and \a spanAngle must be specified in 1/16th of + a degree, i.e. a full circle equals 5760 (16 * 360). Positive + values for the angles mean counter-clockwise while negative values + mean the clockwise direction. Zero degrees is at the 3 o'clock + position. + + \table 100% + \row + \o \inlineimage qpainter-arc.png + \o + \snippet doc/src/snippets/code/src_gui_painting_qpainter.cpp 10 + \endtable + + \sa drawPie(), drawChord(), {The Coordinate System} +*/ + +void QPainter::drawArc(const QRectF &r, int a, int alen) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::drawArc(), [%.2f,%.2f,%.2f,%.2f], angle=%d, sweep=%d\n", + r.x(), r.y(), r.width(), r.height(), a/16, alen/16); +#endif + Q_D(QPainter); + + if (!d->engine) + return; + + QRectF rect = r.normalized(); + + QPainterPath path; + path.arcMoveTo(rect, a/16.0); + path.arcTo(rect, a/16.0, alen/16.0); + strokePath(path, d->state->pen); +} + +/*! \fn void QPainter::drawArc(const QRect &rectangle, int startAngle, + int spanAngle) + + \overload + + Draws the arc defined by the given \a rectangle, \a startAngle and + \a spanAngle. +*/ + +/*! + \fn void QPainter::drawArc(int x, int y, int width, int height, + int startAngle, int spanAngle) + + \overload + + Draws the arc defined by the rectangle beginning at (\a x, \a y) + with the specified \a width and \a height, and the given \a + startAngle and \a spanAngle. +*/ + +/*! + \fn void QPainter::drawPie(const QRectF &rectangle, int startAngle, int spanAngle) + + Draws a pie defined by the given \a rectangle, \a startAngle and + and \a spanAngle. + + The pie is filled with the current brush(). + + The startAngle and spanAngle must be specified in 1/16th of a + degree, i.e. a full circle equals 5760 (16 * 360). Positive values + for the angles mean counter-clockwise while negative values mean + the clockwise direction. Zero degrees is at the 3 o'clock + position. + + \table 100% + \row + \o \inlineimage qpainter-pie.png + \o + \snippet doc/src/snippets/code/src_gui_painting_qpainter.cpp 11 + \endtable + + \sa drawEllipse(), drawChord(), {The Coordinate System} +*/ +void QPainter::drawPie(const QRectF &r, int a, int alen) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::drawPie(), [%.2f,%.2f,%.2f,%.2f], angle=%d, sweep=%d\n", + r.x(), r.y(), r.width(), r.height(), a/16, alen/16); +#endif + Q_D(QPainter); + + if (!d->engine) + return; + + if (a > (360*16)) { + a = a % (360*16); + } else if (a < 0) { + a = a % (360*16); + if (a < 0) a += (360*16); + } + + QRectF rect = r.normalized(); + + QPainterPath path; + path.moveTo(rect.center()); + path.arcTo(rect.x(), rect.y(), rect.width(), rect.height(), a/16.0, alen/16.0); + path.closeSubpath(); + drawPath(path); + +} + +/*! + \fn void QPainter::drawPie(const QRect &rectangle, int startAngle, int spanAngle) + \overload + + Draws a pie defined by the given \a rectangle, \a startAngle and + and \a spanAngle. +*/ + +/*! + \fn void QPainter::drawPie(int x, int y, int width, int height, int + startAngle, int spanAngle) + + \overload + + Draws the pie defined by the rectangle beginning at (\a x, \a y) with + the specified \a width and \a height, and the given \a startAngle and + \a spanAngle. +*/ + +/*! + \fn void QPainter::drawChord(const QRectF &rectangle, int startAngle, int spanAngle) + + Draws the chord defined by the given \a rectangle, \a startAngle and + \a spanAngle. The chord is filled with the current brush(). + + The startAngle and spanAngle must be specified in 1/16th of a + degree, i.e. a full circle equals 5760 (16 * 360). Positive values + for the angles mean counter-clockwise while negative values mean + the clockwise direction. Zero degrees is at the 3 o'clock + position. + + \table 100% + \row + \o \inlineimage qpainter-chord.png + \o + \snippet doc/src/snippets/code/src_gui_painting_qpainter.cpp 12 + \endtable + + \sa drawArc(), drawPie(), {The Coordinate System} +*/ +void QPainter::drawChord(const QRectF &r, int a, int alen) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::drawChord(), [%.2f,%.2f,%.2f,%.2f], angle=%d, sweep=%d\n", + r.x(), r.y(), r.width(), r.height(), a/16, alen/16); +#endif + Q_D(QPainter); + + if (!d->engine) + return; + + QRectF rect = r.normalized(); + + QPainterPath path; + path.arcMoveTo(rect, a/16.0); + path.arcTo(rect, a/16.0, alen/16.0); + path.closeSubpath(); + drawPath(path); +} +/*! + \fn void QPainter::drawChord(const QRect &rectangle, int startAngle, int spanAngle) + + \overload + + Draws the chord defined by the given \a rectangle, \a startAngle and + \a spanAngle. +*/ + +/*! + \fn void QPainter::drawChord(int x, int y, int width, int height, int + startAngle, int spanAngle) + + \overload + + Draws the chord defined by the rectangle beginning at (\a x, \a y) + with the specified \a width and \a height, and the given \a + startAngle and \a spanAngle. +*/ + +#ifdef QT3_SUPPORT +/*! + \fn void QPainter::drawLineSegments(const QPolygon &polygon, int + index, int count) + + Draws \a count separate lines from points defined by the \a + polygon, starting at \a{polygon}\e{[index]} (\a index defaults to + 0). If \a count is -1 (the default) all points until the end of + the array are used. + + Use drawLines() combined with QPolygon::constData() instead. + + \oldcode + QPainter painter(this); + painter.drawLineSegments(polygon, index, count); + \newcode + int lineCount = (count == -1) ? (polygon.size() - index) / 2 : count; + + QPainter painter(this); + painter.drawLines(polygon.constData() + index * 2, lineCount); + \endcode +*/ + +void QPainter::drawLineSegments(const QPolygon &a, int index, int nlines) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::drawLineSegments(), count=%d\n", a.size()/2); +#endif + Q_D(QPainter); + + if (!d->engine) + return; + + if (nlines < 0) + nlines = a.size()/2 - index/2; + if (index + nlines*2 > (int)a.size()) + nlines = (a.size() - index)/2; + if (nlines < 1 || index < 0) + return; + + if (d->extended) { + // FALCON: Use QVectorPath + QVector<QLineF> lines; + for (int i=index; i<index + nlines*2; i+=2) + lines << QLineF(a.at(i), a.at(i+1)); + d->extended->drawLines(lines.data(), lines.size()); + return; + } + + d->updateState(d->state); + + QVector<QLineF> lines; + if (d->state->emulationSpecifier) { + if (d->state->emulationSpecifier == QPaintEngine::PrimitiveTransform + && d->state->matrix.type() == QTransform::TxTranslate) { + QPointF offset(d->state->matrix.dx(), d->state->matrix.dy()); + for (int i=index; i<index + nlines*2; i+=2) + lines << QLineF(a.at(i) + offset, a.at(i+1) + offset); + } else { + QPainterPath linesPath; + for (int i=index; i<index + nlines*2; i+=2) { + linesPath.moveTo(a.at(i)); + linesPath.lineTo(a.at(i+1)); + } + d->draw_helper(linesPath, QPainterPrivate::StrokeDraw); + return; + } + } else { + for (int i=index; i<index + nlines*2; i+=2) + lines << QLineF(a.at(i), a.at(i+1)); + } + + d->engine->drawLines(lines.data(), lines.size()); +} +#endif // QT3_SUPPORT + +/*! + Draws the first \a lineCount lines in the array \a lines + using the current pen. + + \sa drawLine(), drawPolyline() +*/ +void QPainter::drawLines(const QLineF *lines, int lineCount) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::drawLines(), line count=%d\n", lineCount); +#endif + + Q_D(QPainter); + + if (!d->engine || lineCount < 1) + return; + + if (d->extended) { + d->extended->drawLines(lines, lineCount); + return; + } + + d->updateState(d->state); + + uint lineEmulation = line_emulation(d->state->emulationSpecifier); + + if (lineEmulation) { + if (lineEmulation == QPaintEngine::PrimitiveTransform + && d->state->matrix.type() == QTransform::TxTranslate) { + for (int i = 0; i < lineCount; ++i) { + QLineF line = lines[i]; + line.translate(d->state->matrix.dx(), d->state->matrix.dy()); + d->engine->drawLines(&line, 1); + } + } else { + QPainterPath linePath; + for (int i = 0; i < lineCount; ++i) { + linePath.moveTo(lines[i].p1()); + linePath.lineTo(lines[i].p2()); + } + d->draw_helper(linePath, QPainterPrivate::StrokeDraw); + } + return; + } + d->engine->drawLines(lines, lineCount); +} + +/*! + \fn void QPainter::drawLines(const QLine *lines, int lineCount) + \overload + + Draws the first \a lineCount lines in the array \a lines + using the current pen. +*/ +void QPainter::drawLines(const QLine *lines, int lineCount) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::drawLine(), line count=%d\n", lineCount); +#endif + + Q_D(QPainter); + + if (!d->engine || lineCount < 1) + return; + + if (d->extended) { + d->extended->drawLines(lines, lineCount); + return; + } + + d->updateState(d->state); + + uint lineEmulation = line_emulation(d->state->emulationSpecifier); + + if (lineEmulation) { + if (lineEmulation == QPaintEngine::PrimitiveTransform + && d->state->matrix.type() == QTransform::TxTranslate) { + for (int i = 0; i < lineCount; ++i) { + QLineF line = lines[i]; + line.translate(d->state->matrix.dx(), d->state->matrix.dy()); + d->engine->drawLines(&line, 1); + } + } else { + QPainterPath linePath; + for (int i = 0; i < lineCount; ++i) { + linePath.moveTo(lines[i].p1()); + linePath.lineTo(lines[i].p2()); + } + d->draw_helper(linePath, QPainterPrivate::StrokeDraw); + } + return; + } + d->engine->drawLines(lines, lineCount); +} + +/*! + \overload + + Draws the first \a lineCount lines in the array \a pointPairs + using the current pen. The lines are specified as pairs of points + so the number of entries in \a pointPairs must be at least \a + lineCount * 2. +*/ +void QPainter::drawLines(const QPointF *pointPairs, int lineCount) +{ + Q_ASSERT(sizeof(QLineF) == 2*sizeof(QPointF)); + + drawLines((QLineF*)pointPairs, lineCount); +} + +/*! + \overload + + Draws the first \a lineCount lines in the array \a pointPairs + using the current pen. +*/ +void QPainter::drawLines(const QPoint *pointPairs, int lineCount) +{ + Q_ASSERT(sizeof(QLine) == 2*sizeof(QPoint)); + + drawLines((QLine*)pointPairs, lineCount); +} + + +/*! + \fn void QPainter::drawLines(const QVector<QPointF> &pointPairs) + \overload + + Draws a line for each pair of points in the vector \a pointPairs + using the current pen. If there is an odd number of points in the + array, the last point will be ignored. +*/ + +/*! + \fn void QPainter::drawLines(const QVector<QPoint> &pointPairs) + \overload + + Draws a line for each pair of points in the vector \a pointPairs + using the current pen. +*/ + +/*! + \fn void QPainter::drawLines(const QVector<QLineF> &lines) + \overload + + Draws the set of lines defined by the list \a lines using the + current pen and brush. +*/ + +/*! + \fn void QPainter::drawLines(const QVector<QLine> &lines) + \overload + + Draws the set of lines defined by the list \a lines using the + current pen and brush. +*/ + +/*! + Draws the polyline defined by the first \a pointCount points in \a + points using the current pen. + + Note that unlike the drawPolygon() function the last point is \e + not connected to the first, neither is the polyline filled. + + \table 100% + \row + \o + \snippet doc/src/snippets/code/src_gui_painting_qpainter.cpp 13 + \endtable + + \sa drawLines(), drawPolygon(), {The Coordinate System} +*/ +void QPainter::drawPolyline(const QPointF *points, int pointCount) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::drawPolyline(), count=%d\n", pointCount); +#endif + Q_D(QPainter); + + if (!d->engine || pointCount < 2) + return; + + if (d->extended) { + d->extended->drawPolygon(points, pointCount, QPaintEngine::PolylineMode); + return; + } + + d->updateState(d->state); + + uint lineEmulation = line_emulation(d->state->emulationSpecifier); + + if (lineEmulation) { + // ### +// if (lineEmulation == QPaintEngine::PrimitiveTransform +// && d->state->matrix.type() == QTransform::TxTranslate) { +// } else { + QPainterPath polylinePath(points[0]); + for (int i=1; i<pointCount; ++i) + polylinePath.lineTo(points[i]); + d->draw_helper(polylinePath, QPainterPrivate::StrokeDraw); +// } + } else { + d->engine->drawPolygon(points, pointCount, QPaintEngine::PolylineMode); + } +} + +/*! + \overload + + Draws the polyline defined by the first \a pointCount points in \a + points using the current pen. + */ +void QPainter::drawPolyline(const QPoint *points, int pointCount) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::drawPolyline(), count=%d\n", pointCount); +#endif + Q_D(QPainter); + + if (!d->engine || pointCount < 2) + return; + + if (d->extended) { + d->extended->drawPolygon(points, pointCount, QPaintEngine::PolylineMode); + return; + } + + d->updateState(d->state); + + uint lineEmulation = line_emulation(d->state->emulationSpecifier); + + if (lineEmulation) { + // ### +// if (lineEmulation == QPaintEngine::PrimitiveTransform +// && d->state->matrix.type() == QTransform::TxTranslate) { +// } else { + QPainterPath polylinePath(points[0]); + for (int i=1; i<pointCount; ++i) + polylinePath.lineTo(points[i]); + d->draw_helper(polylinePath, QPainterPrivate::StrokeDraw); +// } + } else { + d->engine->drawPolygon(points, pointCount, QPaintEngine::PolylineMode); + } +} + +/*! + \fn void QPainter::drawPolyline(const QPolygon &polygon, int index, int + count) + + \overload + \compat + + Draws the polyline defined by the \a count lines of the given \a + polygon starting at \a index (\a index defaults to 0). + + Use drawPolyline() combined with QPolygon::constData() instead. + + \oldcode + QPainter painter(this); + painter.drawPolyline(polygon, index, count); + \newcode + int pointCount = (count == -1) ? polygon.size() - index : count; + + QPainter painter(this); + painter.drawPolyline(polygon.constData() + index, pointCount); + \endcode +*/ + +/*! + \fn void QPainter::drawPolyline(const QPolygonF &points) + + \overload + + Draws the polyline defined by the given \a points using the + current pen. +*/ + +/*! + \fn void QPainter::drawPolyline(const QPolygon &points) + + \overload + + Draws the polyline defined by the given \a points using the + current pen. +*/ + +/*! + Draws the polygon defined by the first \a pointCount points in the + array \a points using the current pen and brush. + + \table 100% + \row + \o \inlineimage qpainter-polygon.png + \o + \snippet doc/src/snippets/code/src_gui_painting_qpainter.cpp 14 + \endtable + + The first point is implicitly connected to the last point, and the + polygon is filled with the current brush(). + + If \a fillRule is Qt::WindingFill, the polygon is filled using the + winding fill algorithm. If \a fillRule is Qt::OddEvenFill, the + polygon is filled using the odd-even fill algorithm. See + \l{Qt::FillRule} for a more detailed description of these fill + rules. + + \sa drawConvexPolygon(), drawPolyline(), {The Coordinate System} +*/ +void QPainter::drawPolygon(const QPointF *points, int pointCount, Qt::FillRule fillRule) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::drawPolygon(), count=%d\n", pointCount); +#endif + + Q_D(QPainter); + + if (!d->engine || pointCount < 2) + return; + + if (d->extended) { + d->extended->drawPolygon(points, pointCount, QPaintEngine::PolygonDrawMode(fillRule)); + return; + } + + d->updateState(d->state); + + uint emulationSpecifier = d->state->emulationSpecifier; + + if (emulationSpecifier) { + QPainterPath polygonPath(points[0]); + for (int i=1; i<pointCount; ++i) + polygonPath.lineTo(points[i]); + polygonPath.closeSubpath(); + polygonPath.setFillRule(fillRule); + d->draw_helper(polygonPath); + return; + } + + d->engine->drawPolygon(points, pointCount, QPaintEngine::PolygonDrawMode(fillRule)); +} + +/*! \overload + + Draws the polygon defined by the first \a pointCount points in the + array \a points. +*/ +void QPainter::drawPolygon(const QPoint *points, int pointCount, Qt::FillRule fillRule) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::drawPolygon(), count=%d\n", pointCount); +#endif + + Q_D(QPainter); + + if (!d->engine || pointCount < 2) + return; + + if (d->extended) { + d->extended->drawPolygon(points, pointCount, QPaintEngine::PolygonDrawMode(fillRule)); + return; + } + + d->updateState(d->state); + + uint emulationSpecifier = d->state->emulationSpecifier; + + if (emulationSpecifier) { + QPainterPath polygonPath(points[0]); + for (int i=1; i<pointCount; ++i) + polygonPath.lineTo(points[i]); + polygonPath.closeSubpath(); + polygonPath.setFillRule(fillRule); + d->draw_helper(polygonPath); + return; + } + + d->engine->drawPolygon(points, pointCount, QPaintEngine::PolygonDrawMode(fillRule)); +} + +/*! \fn void QPainter::drawPolygon(const QPolygonF &polygon, bool winding, int index = 0, + int count = -1) + \compat + \overload + + Use drawPolygon() combined with QPolygonF::constData() instead. + + \oldcode + QPainter painter(this); + painter.drawPolygon(polygon, winding, index, count); + \newcode + int pointCount = (count == -1) ? polygon.size() - index : count; + int fillRule = winding ? Qt::WindingFill : Qt::OddEvenFill; + + QPainter painter(this); + painter.drawPolygon( polygon.constData() + index, pointCount, fillRule); + \endcode +*/ + +/*! \fn void QPainter::drawPolygon(const QPolygon &polygon, bool winding, + int index = 0, int count = -1) + + \compat + \overload + + Use drawPolygon() combined with QPolygon::constData() instead. + + \oldcode + QPainter painter(this); + painter.drawPolygon(polygon, winding, index, count); + \newcode + int pointCount = (count == -1) ? polygon.size() - index : count; + int fillRule = winding ? Qt::WindingFill : Qt::OddEvenFill; + + QPainter painter(this); + painter.drawPolygon( polygon.constData() + index, pointCount, fillRule); + \endcode +*/ + +/*! \fn void QPainter::drawPolygon(const QPolygonF &points, Qt::FillRule fillRule) + + \overload + + Draws the polygon defined by the given \a points using the fill + rule \a fillRule. +*/ + +/*! \fn void QPainter::drawPolygon(const QPolygon &points, Qt::FillRule fillRule) + + \overload + + Draws the polygon defined by the given \a points using the fill + rule \a fillRule. +*/ + +/*! + \fn void QPainter::drawConvexPolygon(const QPointF *points, int pointCount) + + Draws the convex polygon defined by the first \a pointCount points + in the array \a points using the current pen. + + \table 100% + \row + \o \inlineimage qpainter-polygon.png + \o + \snippet doc/src/snippets/code/src_gui_painting_qpainter.cpp 15 + \endtable + + The first point is implicitly connected to the last point, and the + polygon is filled with the current brush(). If the supplied + polygon is not convex, i.e. it contains at least one angle larger + than 180 degrees, the results are undefined. + + On some platforms (e.g. X11), the drawConvexPolygon() function can + be faster than the drawPolygon() function. + + \sa drawPolygon(), drawPolyline(), {The Coordinate System} +*/ + +/*! + \fn void QPainter::drawConvexPolygon(const QPoint *points, int pointCount) + \overload + + Draws the convex polygon defined by the first \a pointCount points + in the array \a points using the current pen. +*/ + +/*! + \fn void QPainter::drawConvexPolygon(const QPolygonF &polygon) + + \overload + + Draws the convex polygon defined by \a polygon using the current + pen and brush. +*/ + +/*! + \fn void QPainter::drawConvexPolygon(const QPolygon &polygon) + \overload + + Draws the convex polygon defined by \a polygon using the current + pen and brush. +*/ + +/*! + \fn void QPainter::drawConvexPolygon(const QPolygonF &polygon, int + index, int count) + + \compat + \overload + + Use drawConvexPolygon() combined with QPolygonF::constData() + instead. + + \oldcode + QPainter painter(this); + painter.drawConvexPolygon(polygon, index, count); + \newcode + int pointCount = (count == -1) ? polygon.size() - index : count; + + QPainter painter(this); + painter.drawConvexPolygon(polygon.constData() + index, pointCount); + \endcode +*/ + +/*! + \fn void QPainter::drawConvexPolygon(const QPolygon &polygon, int + index, int count) + + \compat + \overload + + Use drawConvexPolygon() combined with QPolygon::constData() + instead. + + \oldcode + QPainter painter(this); + painter.drawConvexPolygon(polygon, index, count); + \newcode + int pointCount = (count == -1) ? polygon.size() - index : count; + + QPainter painter(this); + painter.drawConvexPolygon(polygon.constData() + index, pointCount); + \endcode +*/ + +void QPainter::drawConvexPolygon(const QPoint *points, int pointCount) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::drawConvexPolygon(), count=%d\n", pointCount); +#endif + + Q_D(QPainter); + + if (!d->engine || pointCount < 2) + return; + + if (d->extended) { + d->extended->drawPolygon(points, pointCount, QPaintEngine::ConvexMode); + return; + } + + d->updateState(d->state); + + uint emulationSpecifier = d->state->emulationSpecifier; + + if (emulationSpecifier) { + QPainterPath polygonPath(points[0]); + for (int i=1; i<pointCount; ++i) + polygonPath.lineTo(points[i]); + polygonPath.closeSubpath(); + polygonPath.setFillRule(Qt::WindingFill); + d->draw_helper(polygonPath); + return; + } + + d->engine->drawPolygon(points, pointCount, QPaintEngine::ConvexMode); +} + +void QPainter::drawConvexPolygon(const QPointF *points, int pointCount) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::drawConvexPolygon(), count=%d\n", pointCount); +#endif + + Q_D(QPainter); + + if (!d->engine || pointCount < 2) + return; + + if (d->extended) { + d->extended->drawPolygon(points, pointCount, QPaintEngine::ConvexMode); + return; + } + + d->updateState(d->state); + + uint emulationSpecifier = d->state->emulationSpecifier; + + if (emulationSpecifier) { + QPainterPath polygonPath(points[0]); + for (int i=1; i<pointCount; ++i) + polygonPath.lineTo(points[i]); + polygonPath.closeSubpath(); + polygonPath.setFillRule(Qt::WindingFill); + d->draw_helper(polygonPath); + return; + } + + d->engine->drawPolygon(points, pointCount, QPaintEngine::ConvexMode); +} + +/*! + \fn void QPainter::drawPixmap(const QRectF &target, const QPixmap &pixmap, const QRectF &source) + + Draws the rectangular portion \a source of the given \a pixmap + into the given \a target in the paint device. + + \note The pixmap is scaled to fit the rectangle, if both the pixmap and rectangle size disagree. + + \table 100% + \row + \o + \snippet doc/src/snippets/code/src_gui_painting_qpainter.cpp 16 + \endtable + + If \a pixmap is a QBitmap it is drawn with the bits that are "set" + using the pens color. If backgroundMode is Qt::OpaqueMode, the + "unset" bits are drawn using the color of the background brush; if + backgroundMode is Qt::TransparentMode, the "unset" bits are + transparent. Drawing bitmaps with gradient or texture colors is + not supported. + + \sa drawImage() +*/ +void QPainter::drawPixmap(const QPointF &p, const QPixmap &pm) +{ +#if defined QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::drawPixmap(), p=[%.2f,%.2f], pix=[%d,%d]\n", + p.x(), p.y(), + pm.width(), pm.height()); +#endif + + Q_D(QPainter); + + if (!d->engine || pm.isNull()) + return; + +#ifndef QT_NO_DEBUG + qt_painter_thread_test(d->device->devType(), "drawPixmap()"); +#endif + + if (d->extended) { + d->extended->drawPixmap(p, pm); + return; + } + + qreal x = p.x(); + qreal y = p.y(); + + int w = pm.width(); + int h = pm.height(); + + // Emulate opaque background for bitmaps + if (d->state->bgMode == Qt::OpaqueMode && pm.isQBitmap()) { + fillRect(QRectF(x, y, w, h), d->state->bgBrush.color()); + } + + d->updateState(d->state); + + if ((d->state->matrix.type() > QTransform::TxTranslate + && !d->engine->hasFeature(QPaintEngine::PixmapTransform)) + || (!d->state->matrix.isAffine() && !d->engine->hasFeature(QPaintEngine::PerspectiveTransform)) + || (d->state->opacity != 1.0 && !d->engine->hasFeature(QPaintEngine::ConstantOpacity))) + { + save(); + // If there is no scaling or transformation involved we have to make sure we use the + // antialiased and not the aliased coordinate system by rounding the coordinates. + if (d->state->matrix.type() <= QTransform::TxTranslate) { + x = qRound(x + d->state->matrix.dx()) - d->state->matrix.dx(); + y = qRound(y + d->state->matrix.dy()) - d->state->matrix.dy(); + } + translate(x, y); + setBackgroundMode(Qt::TransparentMode); + setRenderHint(Antialiasing, renderHints() & SmoothPixmapTransform); + QBrush brush(d->state->pen.color(), pm); + setBrush(brush); + setPen(Qt::NoPen); + setBrushOrigin(QPointF(0, 0)); + + drawRect(pm.rect()); + restore(); + } else { + if (!d->engine->hasFeature(QPaintEngine::PixmapTransform)) { + x += d->state->matrix.dx(); + y += d->state->matrix.dy(); + } + d->engine->drawPixmap(QRectF(x, y, w, h), pm, QRectF(0, 0, w, h)); + } +} + +void QPainter::drawPixmap(const QRectF &r, const QPixmap &pm, const QRectF &sr) +{ +#if defined QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::drawPixmap(), target=[%.2f,%.2f,%.2f,%.2f], pix=[%d,%d], source=[%.2f,%.2f,%.2f,%.2f]\n", + r.x(), r.y(), r.width(), r.height(), + pm.width(), pm.height(), + sr.x(), sr.y(), sr.width(), sr.height()); +#endif + + Q_D(QPainter); + if (!d->engine || pm.isNull()) + return; +#ifndef QT_NO_DEBUG + qt_painter_thread_test(d->device->devType(), "drawPixmap()"); +#endif + + qreal x = r.x(); + qreal y = r.y(); + qreal w = r.width(); + qreal h = r.height(); + qreal sx = sr.x(); + qreal sy = sr.y(); + qreal sw = sr.width(); + qreal sh = sr.height(); + + // Sanity-check clipping + if (sw <= 0) + sw = pm.width() - sx; + + if (sh <= 0) + sh = pm.height() - sy; + + if (w < 0) + w = sw; + if (h < 0) + h = sh; + + if (sx < 0) { + qreal w_ratio = sx * w/sw; + x -= w_ratio; + w += w_ratio; + sw += sx; + sx = 0; + } + + if (sy < 0) { + qreal h_ratio = sy * h/sh; + y -= h_ratio; + h += h_ratio; + sh += sy; + sy = 0; + } + + if (sw + sx > pm.width()) { + qreal delta = sw - (pm.width() - sx); + qreal w_ratio = delta * w/sw; + sw -= delta; + w -= w_ratio; + } + + if (sh + sy > pm.height()) { + qreal delta = sh - (pm.height() - sy); + qreal h_ratio = delta * h/sh; + sh -= delta; + h -= h_ratio; + } + + if (w == 0 || h == 0 || sw <= 0 || sh <= 0) + return; + + if (d->extended) { + d->extended->drawPixmap(QRectF(x, y, w, h), pm, QRectF(sx, sy, sw, sh)); + return; + } + + // Emulate opaque background for bitmaps + if (d->state->bgMode == Qt::OpaqueMode && pm.isQBitmap()) + fillRect(QRectF(x, y, w, h), d->state->bgBrush.color()); + + d->updateState(d->state); + + if ((d->state->matrix.type() > QTransform::TxTranslate + && !d->engine->hasFeature(QPaintEngine::PixmapTransform)) + || (!d->state->matrix.isAffine() && !d->engine->hasFeature(QPaintEngine::PerspectiveTransform)) + || (d->state->opacity != 1.0 && !d->engine->hasFeature(QPaintEngine::ConstantOpacity)) + || ((sw != w || sh != h) && !d->engine->hasFeature(QPaintEngine::PixmapTransform))) + { + save(); + // If there is no scaling or transformation involved we have to make sure we use the + // antialiased and not the aliased coordinate system by rounding the coordinates. + if (d->state->matrix.type() <= QTransform::TxTranslate && sw == w && sh == h) { + x = qRound(x + d->state->matrix.dx()) - d->state->matrix.dx(); + y = qRound(y + d->state->matrix.dy()) - d->state->matrix.dy(); + sx = qRound(sx); + sy = qRound(sy); + sw = qRound(sw); + sh = qRound(sh); + } + translate(x, y); + scale(w / sw, h / sh); + setBackgroundMode(Qt::TransparentMode); + setRenderHint(Antialiasing, renderHints() & SmoothPixmapTransform); + QBrush brush(d->state->pen.color(), pm); + setBrush(brush); + setPen(Qt::NoPen); + setBrushOrigin(QPointF(-sx, -sy)); + + drawRect(QRectF(0, 0, sw, sh)); + restore(); + } else { + if (!d->engine->hasFeature(QPaintEngine::PixmapTransform)) { + x += d->state->matrix.dx(); + y += d->state->matrix.dy(); + } + d->engine->drawPixmap(QRectF(x, y, w, h), pm, QRectF(sx, sy, sw, sh)); + } +} + + +/*! + \fn void QPainter::drawPixmap(const QRect &target, const QPixmap &pixmap, + const QRect &source) + \overload + + Draws the rectangular portion \a source of the given \a pixmap + into the given \a target in the paint device. + + \note The pixmap is scaled to fit the rectangle, if both the pixmap and rectangle size disagree. +*/ + +/*! + \fn void QPainter::drawPixmap(const QPointF &point, const QPixmap &pixmap, + const QRectF &source) + \overload + + Draws the rectangular portion \a source of the given \a pixmap + with its origin at the given \a point. +*/ + +/*! + \fn void QPainter::drawPixmap(const QPoint &point, const QPixmap &pixmap, + const QRect &source) + + \overload + + Draws the rectangular portion \a source of the given \a pixmap + with its origin at the given \a point. +*/ + +/*! + \fn void QPainter::drawPixmap(const QPointF &point, const QPixmap &pixmap) + \overload + + Draws the given \a pixmap with its origin at the given \a point. +*/ + +/*! + \fn void QPainter::drawPixmap(const QPoint &point, const QPixmap &pixmap) + \overload + + Draws the given \a pixmap with its origin at the given \a point. +*/ + +/*! + \fn void QPainter::drawPixmap(int x, int y, const QPixmap &pixmap) + + \overload + + Draws the given \a pixmap at position (\a{x}, \a{y}). +*/ + +/*! + \fn void QPainter::drawPixmap(const QRect &rectangle, const QPixmap &pixmap) + \overload + + Draws the given \a pixmap into the given \a rectangle. + + \note The pixmap is scaled to fit the rectangle, if both the pixmap and rectangle size disagree. +*/ + +/*! + \fn void QPainter::drawPixmap(int x, int y, int width, int height, + const QPixmap &pixmap) + + \overload + + Draws the \a pixmap into the rectangle at position (\a{x}, \a{y}) + with the given \a width and \a height. +*/ + +/*! + \fn void QPainter::drawPixmap(int x, int y, int w, int h, const QPixmap &pixmap, + int sx, int sy, int sw, int sh) + + \overload + + Draws the rectangular portion with the origin (\a{sx}, \a{sy}), + width \a sw and height \a sh, of the given \a pixmap , at the + point (\a{x}, \a{y}), with a width of \a w and a height of \a h. + If sw or sh are equal to zero the width/height of the pixmap + is used and adjusted by the offset sx/sy; +*/ + +/*! + \fn void QPainter::drawPixmap(int x, int y, const QPixmap &pixmap, + int sx, int sy, int sw, int sh) + + \overload + + Draws a pixmap at (\a{x}, \a{y}) by copying a part of the given \a + pixmap into the paint device. + + (\a{x}, \a{y}) specifies the top-left point in the paint device that is + to be drawn onto. (\a{sx}, \a{sy}) specifies the top-left point in \a + pixmap that is to be drawn. The default is (0, 0). + + (\a{sw}, \a{sh}) specifies the size of the pixmap that is to be drawn. + The default, (0, 0) (and negative) means all the way to the + bottom-right of the pixmap. +*/ + +void QPainter::drawImage(const QPointF &p, const QImage &image) +{ + Q_D(QPainter); + + if (!d->engine || image.isNull()) + return; + + if (d->extended) { + d->extended->drawImage(p, image); + return; + } + + qreal x = p.x(); + qreal y = p.y(); + + int w = image.width(); + int h = image.height(); + + d->updateState(d->state); + + if (((d->state->matrix.type() > QTransform::TxTranslate) + && !d->engine->hasFeature(QPaintEngine::PixmapTransform)) + || (!d->state->matrix.isAffine() && !d->engine->hasFeature(QPaintEngine::PerspectiveTransform)) + || (d->state->opacity != 1.0 && !d->engine->hasFeature(QPaintEngine::ConstantOpacity))) + { + save(); + // If there is no scaling or transformation involved we have to make sure we use the + // antialiased and not the aliased coordinate system by rounding the coordinates. + if (d->state->matrix.type() <= QTransform::TxTranslate) { + x = qRound(x + d->state->matrix.dx()) - d->state->matrix.dx(); + y = qRound(y + d->state->matrix.dy()) - d->state->matrix.dy(); + } + translate(x, y); + setBackgroundMode(Qt::TransparentMode); + setRenderHint(Antialiasing, renderHints() & SmoothPixmapTransform); + QBrush brush(image); + setBrush(brush); + setPen(Qt::NoPen); + setBrushOrigin(QPointF(0, 0)); + + drawRect(image.rect()); + restore(); + return; + } + + if (d->state->matrix.type() == QTransform::TxTranslate + && !d->engine->hasFeature(QPaintEngine::PixmapTransform)) { + x += d->state->matrix.dx(); + y += d->state->matrix.dy(); + } + + d->engine->drawImage(QRectF(x, y, w, h), image, QRectF(0, 0, w, h), Qt::AutoColor); +} + +void QPainter::drawImage(const QRectF &targetRect, const QImage &image, const QRectF &sourceRect, + Qt::ImageConversionFlags flags) +{ + Q_D(QPainter); + + if (!d->engine || image.isNull()) + return; + + qreal x = targetRect.x(); + qreal y = targetRect.y(); + qreal w = targetRect.width(); + qreal h = targetRect.height(); + qreal sx = sourceRect.x(); + qreal sy = sourceRect.y(); + qreal sw = sourceRect.width(); + qreal sh = sourceRect.height(); + + // Sanity-check clipping + if (sw <= 0) + sw = image.width() - sx; + + if (sh <= 0) + sh = image.height() - sy; + + if (w < 0) + w = sw; + if (h < 0) + h = sh; + + if (sx < 0) { + qreal w_ratio = sx * w/sw; + x -= w_ratio; + w += w_ratio; + sw += sx; + sx = 0; + } + + if (sy < 0) { + qreal h_ratio = sy * h/sh; + y -= h_ratio; + h += h_ratio; + sh += sy; + sy = 0; + } + + if (sw + sx > image.width()) { + qreal delta = sw - (image.width() - sx); + qreal w_ratio = delta * w/sw; + sw -= delta; + w -= w_ratio; + } + + if (sh + sy > image.height()) { + qreal delta = sh - (image.height() - sy); + qreal h_ratio = delta * h/sh; + sh -= delta; + h -= h_ratio; + } + + if (w == 0 || h == 0 || sw <= 0 || sh <= 0) + return; + + if (d->extended) { + d->extended->drawImage(QRectF(x, y, w, h), image, QRectF(sx, sy, sw, sh), flags); + return; + } + + d->updateState(d->state); + + if (((d->state->matrix.type() > QTransform::TxTranslate || (sw != w || sh != h)) + && !d->engine->hasFeature(QPaintEngine::PixmapTransform)) + || (!d->state->matrix.isAffine() && !d->engine->hasFeature(QPaintEngine::PerspectiveTransform)) + || (d->state->opacity != 1.0 && !d->engine->hasFeature(QPaintEngine::ConstantOpacity))) + { + save(); + // If there is no scaling or transformation involved we have to make sure we use the + // antialiased and not the aliased coordinate system by rounding the coordinates. + if (d->state->matrix.type() <= QTransform::TxTranslate && sw == w && sh == h) { + x = qRound(x + d->state->matrix.dx()) - d->state->matrix.dx(); + y = qRound(y + d->state->matrix.dy()) - d->state->matrix.dy(); + sx = qRound(sx); + sy = qRound(sy); + sw = qRound(sw); + sh = qRound(sh); + } + translate(x, y); + scale(w / sw, h / sh); + setBackgroundMode(Qt::TransparentMode); + setRenderHint(Antialiasing, renderHints() & SmoothPixmapTransform); + QBrush brush(image); + setBrush(brush); + setPen(Qt::NoPen); + setBrushOrigin(QPointF(-sx, -sy)); + + drawRect(QRectF(0, 0, sw, sh)); + restore(); + return; + } + + if (d->state->matrix.type() == QTransform::TxTranslate + && !d->engine->hasFeature(QPaintEngine::PixmapTransform)) { + x += d->state->matrix.dx(); + y += d->state->matrix.dy(); + } + + d->engine->drawImage(QRectF(x, y, w, h), image, QRectF(sx, sy, sw, sh), flags); +} + +/*! + \fn void QPainter::drawText(const QPointF &position, const QString &text) + + Draws the given \a text with the currently defined text direction, + beginning at the given \a position. + + This function does not handle the newline character (\n), as it cannot + break text into multiple lines, and it cannot display the newline character. + Use the QPainter::drawText() overload that takes a rectangle instead + if you want to draw multiple lines of text with the newline character, or + if you want the text to be wrapped. + + By default, QPainter draws text anti-aliased. + + \note The y-position is used as the baseline of the font. +*/ + +void QPainter::drawText(const QPointF &p, const QString &str) +{ + drawText(p, str, 0, 0); +} + +/*! + \internal +*/ +void QPainter::drawText(const QPointF &p, const QString &str, int tf, int justificationPadding) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::drawText(), pos=[%.2f,%.2f], str='%s'\n", p.x(), p.y(), str.toLatin1().constData()); +#endif + + Q_D(QPainter); + + if (!d->engine || str.isEmpty() || pen().style() == Qt::NoPen) + return; + + QStackTextEngine engine(str, d->state->font); + engine.option.setTextDirection(d->state->layoutDirection); + if (tf & (Qt::TextForceLeftToRight|Qt::TextForceRightToLeft)) { + engine.ignoreBidi = true; + engine.option.setTextDirection((tf & Qt::TextForceLeftToRight) ? Qt::LeftToRight : Qt::RightToLeft); + } + engine.itemize(); + QScriptLine line; + line.length = str.length(); + engine.shapeLine(line); + + int nItems = engine.layoutData->items.size(); + QVarLengthArray<int> visualOrder(nItems); + QVarLengthArray<uchar> levels(nItems); + for (int i = 0; i < nItems; ++i) + levels[i] = engine.layoutData->items[i].analysis.bidiLevel; + QTextEngine::bidiReorder(nItems, levels.data(), visualOrder.data()); + + if (justificationPadding > 0) { + engine.option.setAlignment(Qt::AlignJustify); + engine.forceJustification = true; + // this works because justify() is only interested in the difference between width and textWidth + line.width = justificationPadding; + engine.justify(line); + } + QFixed x = QFixed::fromReal(p.x()); + QFixed ox = x; + + for (int i = 0; i < nItems; ++i) { + int item = visualOrder[i]; + const QScriptItem &si = engine.layoutData->items.at(item); + if (si.analysis.flags >= QScriptAnalysis::TabOrObject) { + x += si.width; + continue; + } + QFont f = engine.font(si); + QTextItemInt gf(si, &f); + gf.glyphs = engine.shapedGlyphs(&si); + gf.chars = engine.layoutData->string.unicode() + si.position; + gf.num_chars = engine.length(item); + gf.width = si.width; + gf.logClusters = engine.logClusters(&si); + + drawTextItem(QPointF(x.toReal(), p.y()), gf); + + x += si.width; + } +} + +void QPainter::drawText(const QRect &r, int flags, const QString &str, QRect *br) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::drawText(), r=[%d,%d,%d,%d], flags=%d, str='%s'\n", + r.x(), r.y(), r.width(), r.height(), flags, str.toLatin1().constData()); +#endif + + Q_D(QPainter); + + if (!d->engine || str.length() == 0 || pen().style() == Qt::NoPen) + return; + + if (!d->extended) + d->updateState(d->state); + + QRectF bounds; + qt_format_text(d->state->font, r, flags, 0, str, br ? &bounds : 0, 0, 0, 0, this); + if (br) + *br = bounds.toAlignedRect(); +} + +/*! + \fn void QPainter::drawText(const QPoint &position, const QString &text) + + \overload + + Draws the given \a text with the currently defined text direction, + beginning at the given \a position. + + By default, QPainter draws text anti-aliased. + + \note The y-position is used as the baseline of the font. + +*/ + +/*! + \fn void QPainter::drawText(const QRectF &rectangle, int flags, const QString &text, QRectF *boundingRect) + \overload + + Draws the given \a text within the provided \a rectangle. + + \table 100% + \row + \o \inlineimage qpainter-text.png + \o + \snippet doc/src/snippets/code/src_gui_painting_qpainter.cpp 17 + \endtable + + The \a boundingRect (if not null) is set to the what the bounding rectangle + should be in order to enclose the whole text. The \a flags argument is a bitwise + OR of the following flags: + + \list + \o Qt::AlignLeft + \o Qt::AlignRight + \o Qt::AlignHCenter + \o Qt::AlignJustify + \o Qt::AlignTop + \o Qt::AlignBottom + \o Qt::AlignVCenter + \o Qt::AlignCenter + \o Qt::TextDontClip + \o Qt::TextSingleLine + \o Qt::TextExpandTabs + \o Qt::TextShowMnemonic + \o Qt::TextWordWrap + \o Qt::TextIncludeTrailingSpaces + \endlist + + \sa Qt::AlignmentFlag, Qt::TextFlag, boundingRect(), layoutDirection() + + By default, QPainter draws text anti-aliased. + + \note The y-coordinate of \a rectangle is used as the top of the font. +*/ +void QPainter::drawText(const QRectF &r, int flags, const QString &str, QRectF *br) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::drawText(), r=[%.2f,%.2f,%.2f,%.2f], flags=%d, str='%s'\n", + r.x(), r.y(), r.width(), r.height(), flags, str.toLatin1().constData()); +#endif + + Q_D(QPainter); + + if (!d->engine || str.length() == 0 || pen().style() == Qt::NoPen) + return; + + if (!d->extended) + d->updateState(d->state); + + qt_format_text(d->state->font, r, flags, 0, str, br, 0, 0, 0, this); +} + +/*! + \fn void QPainter::drawText(const QRect &rectangle, int flags, const QString &text, QRect *boundingRect) + \overload + + Draws the given \a text within the provided \a rectangle according + to the specified \a flags. The \a boundingRect (if not null) is set to + the what the bounding rectangle should be in order to enclose the whole text. + + By default, QPainter draws text anti-aliased. + + \note The y-coordinate of \a rectangle is used as the top of the font. +*/ + +/*! + \fn void QPainter::drawText(int x, int y, const QString &text) + + \overload + + Draws the given \a text at position (\a{x}, \a{y}), using the painter's + currently defined text direction. + + By default, QPainter draws text anti-aliased. + + \note The y-position is used as the baseline of the font. + +*/ + +/*! + \fn void QPainter::drawText(int x, int y, int width, int height, int flags, + const QString &text, QRect *boundingRect) + + \overload + + Draws the given \a text within the rectangle with origin (\a{x}, + \a{y}), \a width and \a height. + + The \a boundingRect (if not null) is set to the actual bounding + rectangle of the output. The \a flags argument is a bitwise OR of + the following flags: + + \list + \o Qt::AlignLeft + \o Qt::AlignRight + \o Qt::AlignHCenter + \o Qt::AlignJustify + \o Qt::AlignTop + \o Qt::AlignBottom + \o Qt::AlignVCenter + \o Qt::AlignCenter + \o Qt::TextSingleLine + \o Qt::TextExpandTabs + \o Qt::TextShowMnemonic + \o Qt::TextWordWrap + \endlist + + By default, QPainter draws text anti-aliased. + + \note The y-position is used as the baseline of the font. + + \sa Qt::AlignmentFlag, Qt::TextFlag +*/ + +/*! + \fn void QPainter::drawText(const QRectF &rectangle, const QString &text, + const QTextOption &option) + \overload + + Draws the given \a text in the \a rectangle specified using the \a option + to control its positioning and orientation. + + By default, QPainter draws text anti-aliased. + + \note The y-coordinate of \a rectangle is used as the top of the font. +*/ +void QPainter::drawText(const QRectF &r, const QString &text, const QTextOption &o) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::drawText(), r=[%.2f,%.2f,%.2f,%.2f], str='%s'\n", + r.x(), r.y(), r.width(), r.height(), text.toLatin1().constData()); +#endif + + Q_D(QPainter); + + if (!d->engine || text.length() == 0 || pen().style() == Qt::NoPen) + return; + + if (!d->extended) + d->updateState(d->state); + + qt_format_text(d->state->font, r, 0, &o, text, 0, 0, 0, 0, this); +} + +/*! + \fn void QPainter::drawTextItem(int x, int y, const QTextItem &ti) + + \internal + \overload +*/ + +/*! + \fn void QPainter::drawTextItem(const QPoint &p, const QTextItem &ti) + + \internal + \overload + + Draws the text item \a ti at position \a p. +*/ + +/*! \internal + Draws the text item \a ti at position \a p. + + This method ignores the painters background mode and + color. drawText and qt_format_text have to do it themselves, as + only they know the extents of the complete string. + + It ignores the font set on the painter as the text item has one of its own. + + The underline and strikeout parameters of the text items font are + ignored aswell. You'll need to pass in the correct flags to get + underlining and strikeout. +*/ +static QPainterPath generateWavyPath(qreal minWidth, qreal maxRadius, QPaintDevice *device) +{ + extern int qt_defaultDpi(); + QPainterPath path; + + bool up = true; + const qreal radius = qMax(qreal(.5), qMin(qreal(1.25 * device->logicalDpiY() / qt_defaultDpi()), maxRadius)); + qreal xs, ys; + int i = 0; + path.moveTo(0, radius); + do { + xs = i*(2*radius); + ys = 0; + + qreal remaining = minWidth - xs; + qreal angle = 180; + + // cut-off at the last arc segment + if (remaining < 2 * radius) + angle = 180 * remaining / (2 * radius); + + path.arcTo(xs, ys, 2*radius, 2*radius, 180, up ? angle : -angle); + + up = !up; + ++i; + } while (xs + 2*radius < minWidth); + + return path; +} + +static void drawTextItemDecoration(QPainter *painter, const QPointF &pos, const QTextItemInt &ti) +{ + QTextCharFormat::UnderlineStyle underlineStyle = ti.underlineStyle; + if (underlineStyle == QTextCharFormat::NoUnderline + && !(ti.flags & (QTextItem::StrikeOut | QTextItem::Overline))) + return; + + QFontEngine *fe = ti.fontEngine; + + const QPen oldPen = painter->pen(); + const QBrush oldBrush = painter->brush(); + painter->setBrush(Qt::NoBrush); + QPen pen = oldPen; + pen.setStyle(Qt::SolidLine); + pen.setWidthF(fe->lineThickness().toReal()); + pen.setCapStyle(Qt::FlatCap); + + QLineF line(pos.x(), pos.y(), pos.x() + ti.width.toReal(), pos.y()); + // deliberately ceil the offset to avoid the underline coming too close to + // the text above it. + const qreal underlinePos = pos.y() + qCeil(fe->underlinePosition().toReal()); + + if (underlineStyle == QTextCharFormat::SpellCheckUnderline) { + underlineStyle = QTextCharFormat::UnderlineStyle(QApplication::style()->styleHint(QStyle::SH_SpellCheckUnderlineStyle)); + } + + if (underlineStyle == QTextCharFormat::WaveUnderline) { + painter->save(); + painter->setRenderHint(QPainter::Antialiasing); + painter->translate(pos.x(), underlinePos); + + QColor uc = ti.charFormat.underlineColor(); + if (uc.isValid()) + painter->setPen(uc); + + painter->drawPath(generateWavyPath(ti.width.toReal(), + fe->underlinePosition().toReal(), + painter->device())); + painter->restore(); + } else if (underlineStyle != QTextCharFormat::NoUnderline) { + QLineF underLine(line.x1(), underlinePos, line.x2(), underlinePos); + + QColor uc = ti.charFormat.underlineColor(); + if (uc.isValid()) + pen.setColor(uc); + + pen.setStyle((Qt::PenStyle)(underlineStyle)); + painter->setPen(pen); + painter->drawLine(underLine); + } + + pen.setStyle(Qt::SolidLine); + pen.setColor(oldPen.color()); + + if (ti.flags & QTextItem::StrikeOut) { + QLineF strikeOutLine = line; + strikeOutLine.translate(0., - fe->ascent().toReal() / 3.); + painter->setPen(pen); + painter->drawLine(strikeOutLine); + } + + if (ti.flags & QTextItem::Overline) { + QLineF overLine = line; + overLine.translate(0., - fe->ascent().toReal()); + painter->setPen(pen); + painter->drawLine(overLine); + } + + painter->setPen(oldPen); + painter->setBrush(oldBrush); +} + +/*! + \internal + \since 4.1 +*/ +void QPainter::drawTextItem(const QPointF &p, const QTextItem &_ti) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::drawTextItem(), pos=[%.f,%.f], str='%s'\n", + p.x(), p.y(), qPrintable(_ti.text())); +#endif + + Q_D(QPainter); + + if (!d->engine) + return; + +#ifndef QT_NO_DEBUG + qt_painter_thread_test(d->device->devType(), + "text and fonts", + QFontDatabase::supportsThreadedFontRendering()); +#endif + + QTextItemInt &ti = const_cast<QTextItemInt &>(static_cast<const QTextItemInt &>(_ti)); + + if (!d->extended && d->state->bgMode == Qt::OpaqueMode) { + QRectF rect(p.x(), p.y() - ti.ascent.toReal(), ti.width.toReal(), (ti.ascent + ti.descent + 1).toReal()); + fillRect(rect, d->state->bgBrush); + } + + if (pen().style() == Qt::NoPen) + return; + + const RenderHints oldRenderHints = d->state->renderHints; + if (!d->state->renderHints & QPainter::Antialiasing && d->state->matrix.type() >= QTransform::TxScale) { + // draw antialias decoration (underline/overline/strikeout) with + // transformed text + + bool aa = true; + const QTransform &m = d->state->matrix; + if (d->state->matrix.type() < QTransform::TxShear) { + bool isPlain90DegreeRotation = + (qFuzzyCompare(m.m11() + 1, qreal(1)) + && qFuzzyCompare(m.m12(), qreal(1)) + && qFuzzyCompare(m.m21(), qreal(-1)) + && qFuzzyCompare(m.m22() + 1, qreal(1)) + ) + || + (qFuzzyCompare(m.m11(), qreal(-1)) + && qFuzzyCompare(m.m12() + 1, qreal(1)) + && qFuzzyCompare(m.m21() + 1, qreal(1)) + && qFuzzyCompare(m.m22(), qreal(-1)) + ) + || + (qFuzzyCompare(m.m11() + 1, qreal(1)) + && qFuzzyCompare(m.m12(), qreal(-1)) + && qFuzzyCompare(m.m21(), qreal(1)) + && qFuzzyCompare(m.m22() + 1, qreal(1)) + ) + ; + aa = !isPlain90DegreeRotation; + } + if (aa) + setRenderHint(QPainter::Antialiasing, true); + } + + if (!d->extended) + d->updateState(d->state); + + if (!ti.glyphs.numGlyphs) { + // nothing to do + } else if (ti.fontEngine->type() == QFontEngine::Multi) { + QFontEngineMulti *multi = static_cast<QFontEngineMulti *>(ti.fontEngine); + + const QGlyphLayout &glyphs = ti.glyphs; + int which = glyphs.glyphs[0] >> 24; + + qreal x = p.x(); + qreal y = p.y(); + + int start = 0; + int end, i; + for (end = 0; end < ti.glyphs.numGlyphs; ++end) { + const int e = glyphs.glyphs[end] >> 24; + if (e == which) + continue; + + + QTextItemInt ti2 = ti.midItem(multi->engine(which), start, end - start); + ti2.width = 0; + // set the high byte to zero and calc the width + for (i = start; i < end; ++i) { + glyphs.glyphs[i] = glyphs.glyphs[i] & 0xffffff; + ti2.width += ti.glyphs.effectiveAdvance(i); + } + + d->engine->drawTextItem(QPointF(x, y), ti2); + + // reset the high byte for all glyphs and advance to the next sub-string + const int hi = which << 24; + for (i = start; i < end; ++i) { + glyphs.glyphs[i] = hi | glyphs.glyphs[i]; + } + x += ti2.width.toReal(); + + // change engine + start = end; + which = e; + } + + QTextItemInt ti2 = ti.midItem(multi->engine(which), start, end - start); + ti2.width = 0; + // set the high byte to zero and calc the width + for (i = start; i < end; ++i) { + glyphs.glyphs[i] = glyphs.glyphs[i] & 0xffffff; + ti2.width += ti.glyphs.effectiveAdvance(i); + } + + if (d->extended) + d->extended->drawTextItem(QPointF(x, y), ti2); + else + d->engine->drawTextItem(QPointF(x,y), ti2); + + // reset the high byte for all glyphs + const int hi = which << 24; + for (i = start; i < end; ++i) + glyphs.glyphs[i] = hi | glyphs.glyphs[i]; + + } else { + if (d->extended) + d->extended->drawTextItem(p, ti); + else + d->engine->drawTextItem(p, ti); + } + drawTextItemDecoration(this, p, ti); + + if (d->state->renderHints != oldRenderHints) { + d->state->renderHints = oldRenderHints; + if (d->extended) + d->extended->renderHintsChanged(); + else + d->state->dirtyFlags |= QPaintEngine::DirtyHints; + } +} + +/*! + \fn QRectF QPainter::boundingRect(const QRectF &rectangle, int flags, const QString &text) + + Returns the bounding rectangle of the \a text as it will appear + when drawn inside the given \a rectangle with the specified \a + flags using the currently set font(); i.e the function tells you + where the drawText() function will draw when given the same + arguments. + + If the \a text does not fit within the given \a rectangle using + the specified \a flags, the function returns the required + rectangle. + + The \a flags argument is a bitwise OR of the following flags: + \list + \o Qt::AlignLeft + \o Qt::AlignRight + \o Qt::AlignHCenter + \o Qt::AlignTop + \o Qt::AlignBottom + \o Qt::AlignVCenter + \o Qt::AlignCenter + \o Qt::TextSingleLine + \o Qt::TextExpandTabs + \o Qt::TextShowMnemonic + \o Qt::TextWordWrap + \o Qt::TextIncludeTrailingSpaces + \endlist + If several of the horizontal or several of the vertical alignment + flags are set, the resulting alignment is undefined. + + \sa drawText(), Qt::Alignment, Qt::TextFlag +*/ + +/*! + \fn QRect QPainter::boundingRect(const QRect &rectangle, int flags, + const QString &text) + + \overload + + Returns the bounding rectangle of the \a text as it will appear + when drawn inside the given \a rectangle with the specified \a + flags using the currently set font(). +*/ + +/*! + \fn QRect QPainter::boundingRect(int x, int y, int w, int h, int flags, + const QString &text); + + \overload + + Returns the bounding rectangle of the given \a text as it will + appear when drawn inside the rectangle beginning at the point + (\a{x}, \a{y}) with width \a w and height \a h. +*/ +QRect QPainter::boundingRect(const QRect &rect, int flags, const QString &str) +{ + if (str.isEmpty()) + return QRect(rect.x(),rect.y(), 0,0); + QRect brect; + drawText(rect, flags | Qt::TextDontPrint, str, &brect); + return brect; +} + + + +QRectF QPainter::boundingRect(const QRectF &rect, int flags, const QString &str) +{ + if (str.isEmpty()) + return QRectF(rect.x(),rect.y(), 0,0); + QRectF brect; + drawText(rect, flags | Qt::TextDontPrint, str, &brect); + return brect; +} + +/*! + \fn QRectF QPainter::boundingRect(const QRectF &rectangle, + const QString &text, const QTextOption &option) + + \overload + + Instead of specifying flags as a bitwise OR of the + Qt::AlignmentFlag and Qt::TextFlag, this overloaded function takes + an \a option argument. The QTextOption class provides a + description of general rich text properties. + + \sa QTextOption +*/ +QRectF QPainter::boundingRect(const QRectF &r, const QString &text, const QTextOption &o) +{ + Q_D(QPainter); + + if (!d->engine || text.length() == 0) + return QRectF(r.x(),r.y(), 0,0); + + QRectF br; + qt_format_text(d->state->font, r, Qt::TextDontPrint, &o, text, &br, 0, 0, 0, this); + return br; +} + +/*! + \fn void QPainter::drawTiledPixmap(const QRectF &rectangle, const QPixmap &pixmap, const QPointF &position) + + Draws a tiled \a pixmap, inside the given \a rectangle with its + origin at the given \a position. + + Calling drawTiledPixmap() is similar to calling drawPixmap() + several times to fill (tile) an area with a pixmap, but is + potentially much more efficient depending on the underlying window + system. + + \sa drawPixmap() +*/ +void QPainter::drawTiledPixmap(const QRectF &r, const QPixmap &pixmap, const QPointF &sp) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::drawTiledPixmap(), target=[%.2f,%.2f,%.2f,%.2f], pix=[%d,%d], offset=[%.2f,%.2f]\n", + r.x(), r.y(), r.width(), r.height(), + pixmap.width(), pixmap.height(), + sp.x(), sp.y()); +#endif + + Q_D(QPainter); + if (!d->engine || pixmap.isNull() || r.isEmpty()) + return; + +#ifndef QT_NO_DEBUG + qt_painter_thread_test(d->device->devType(), "drawTiledPixmap()"); +#endif + + qreal sw = pixmap.width(); + qreal sh = pixmap.height(); + qreal sx = sp.x(); + qreal sy = sp.y(); + if (sx < 0) + sx = qRound(sw) - qRound(-sx) % qRound(sw); + else + sx = qRound(sx) % qRound(sw); + if (sy < 0) + sy = qRound(sh) - -qRound(sy) % qRound(sh); + else + sy = qRound(sy) % qRound(sh); + + + if (d->extended) { + d->extended->drawTiledPixmap(r, pixmap, QPointF(sx, sy)); + return; + } + + if (d->state->bgMode == Qt::OpaqueMode && pixmap.isQBitmap()) + fillRect(r, d->state->bgBrush); + + d->updateState(d->state); + if ((d->state->matrix.type() > QTransform::TxTranslate + && !d->engine->hasFeature(QPaintEngine::PixmapTransform)) + || (d->state->opacity != 1.0 && !d->engine->hasFeature(QPaintEngine::ConstantOpacity))) + { + save(); + setBackgroundMode(Qt::TransparentMode); + setRenderHint(Antialiasing, renderHints() & SmoothPixmapTransform); + setBrush(QBrush(d->state->pen.color(), pixmap)); + setPen(Qt::NoPen); + + // If there is no scaling or transformation involved we have to make sure we use the + // antialiased and not the aliased coordinate system by rounding the coordinates. + if (d->state->matrix.type() <= QTransform::TxTranslate) { + qreal x = qRound(r.x() + d->state->matrix.dx()) - d->state->matrix.dx(); + qreal y = qRound(r.y() + d->state->matrix.dy()) - d->state->matrix.dy(); + qreal w = qRound(r.width()); + qreal h = qRound(r.height()); + sx = qRound(sx); + sy = qRound(sy); + setBrushOrigin(QPointF(r.x()-sx, r.y()-sy)); + drawRect(QRectF(x, y, w, h)); + } else { + setBrushOrigin(QPointF(r.x()-sx, r.y()-sy)); + drawRect(r); + } + restore(); + return; + } + + qreal x = r.x(); + qreal y = r.y(); + if (d->state->matrix.type() == QTransform::TxTranslate + && !d->engine->hasFeature(QPaintEngine::PixmapTransform)) { + x += d->state->matrix.dx(); + y += d->state->matrix.dy(); + } + + d->engine->drawTiledPixmap(QRectF(x, y, r.width(), r.height()), pixmap, QPointF(sx, sy)); +} + +/*! + \fn QPainter::drawTiledPixmap(const QRect &rectangle, const QPixmap &pixmap, + const QPoint &position = QPoint()) + \overload + + Draws a tiled \a pixmap, inside the given \a rectangle with its + origin at the given \a position. +*/ + +/*! + \fn void QPainter::drawTiledPixmap(int x, int y, int width, int height, const + QPixmap &pixmap, int sx, int sy); + \overload + + Draws a tiled \a pixmap in the specified rectangle. + + (\a{x}, \a{y}) specifies the top-left point in the paint device + that is to be drawn onto; with the given \a width and \a + height. (\a{sx}, \a{sy}) specifies the top-left point in the \a + pixmap that is to be drawn; this defaults to (0, 0). +*/ + +#ifndef QT_NO_PICTURE + +/*! + \fn void QPainter::drawPicture(const QPointF &point, const QPicture &picture) + + Replays the given \a picture at the given \a point. + + The QPicture class is a paint device that records and replays + QPainter commands. A picture serializes the painter commands to an + IO device in a platform-independent format. Everything that can be + painted on a widget or pixmap can also be stored in a picture. + + This function does exactly the same as QPicture::play() when + called with \a point = QPoint(0, 0). + + \table 100% + \row + \o + \snippet doc/src/snippets/code/src_gui_painting_qpainter.cpp 18 + \endtable + + \sa QPicture::play() +*/ + +void QPainter::drawPicture(const QPointF &p, const QPicture &picture) +{ + Q_D(QPainter); + + if (!d->engine) + return; + + if (!d->extended) + d->updateState(d->state); + + save(); + translate(p); + const_cast<QPicture *>(&picture)->play(this); + restore(); +} + +/*! + \fn void QPainter::drawPicture(const QPoint &point, const QPicture &picture) + \overload + + Replays the given \a picture at the given \a point. +*/ + +/*! + \fn void QPainter::drawPicture(int x, int y, const QPicture &picture) + \overload + + Draws the given \a picture at point (\a x, \a y). +*/ + +#endif // QT_NO_PICTURE + +/*! + \fn void QPainter::eraseRect(const QRectF &rectangle) + + Erases the area inside the given \a rectangle. Equivalent to + calling + \snippet doc/src/snippets/code/src_gui_painting_qpainter.cpp 19 + + \sa fillRect() +*/ +void QPainter::eraseRect(const QRectF &r) +{ + Q_D(QPainter); + + fillRect(r, d->state->bgBrush); +} + +static inline bool needsResolving(const QBrush &brush) +{ + Qt::BrushStyle s = brush.style(); + return ((s == Qt::LinearGradientPattern || s == Qt::RadialGradientPattern || + s == Qt::ConicalGradientPattern) && + brush.gradient()->coordinateMode() == QGradient::ObjectBoundingMode); +} + +/*! + \fn void QPainter::eraseRect(const QRect &rectangle) + \overload + + Erases the area inside the given \a rectangle. +*/ + +/*! + \fn void QPainter::eraseRect(int x, int y, int width, int height) + \overload + + Erases the area inside the rectangle beginning at (\a x, \a y) + with the given \a width and \a height. +*/ + + +/*! + \fn void QPainter::fillRect(int x, int y, int width, int height, Qt::BrushStyle style) + \overload + + Fills the rectangle beginning at (\a{x}, \a{y}) with the given \a + width and \a height, using the brush \a style specified. + + \since 4.5 +*/ + +/*! + \fn void QPainter::fillRect(const QRect &rectangle, Qt::BrushStyle style) + \overload + + Fills the given \a rectangle with the brush \a style specified. + + \since 4.5 +*/ + +/*! + \fn void QPainter::fillRect(const QRectF &rectangle, Qt::BrushStyle style) + \overload + + Fills the given \a rectangle with the brush \a style specified. + + \since 4.5 +*/ + +/*! + \fn void QPainter::fillRect(const QRectF &rectangle, const QBrush &brush) + + Fills the given \a rectangle with the \a brush specified. + + Alternatively, you can specify a QColor instead of a QBrush; the + QBrush constructor (taking a QColor argument) will automatically + create a solid pattern brush. + + \sa drawRect() +*/ +void QPainter::fillRect(const QRectF &r, const QBrush &brush) +{ + Q_D(QPainter); + + if (!d->engine) + return; + + if (d->extended) { + const QGradient *g = brush.gradient(); + if (!g || g->coordinateMode() == QGradient::LogicalMode) { + d->extended->fillRect(r, brush); + return; + } + } + + QPen oldPen = pen(); + QBrush oldBrush = this->brush(); + setPen(Qt::NoPen); + if (brush.style() == Qt::SolidPattern) { + d->colorBrush.setStyle(Qt::SolidPattern); + d->colorBrush.setColor(brush.color()); + setBrush(d->colorBrush); + } else { + setBrush(brush); + } + + drawRect(r); + setBrush(oldBrush); + setPen(oldPen); +} + +/*! + \fn void QPainter::fillRect(const QRect &rectangle, const QBrush &brush) + \overload + + Fills the given \a rectangle with the specified \a brush. +*/ + +void QPainter::fillRect(const QRect &r, const QBrush &brush) +{ + Q_D(QPainter); + + if (!d->engine) + return; + + if (d->extended) { + const QGradient *g = brush.gradient(); + if (!g || g->coordinateMode() == QGradient::LogicalMode) { + d->extended->fillRect(r, brush); + return; + } + } + + QPen oldPen = pen(); + QBrush oldBrush = this->brush(); + setPen(Qt::NoPen); + if (brush.style() == Qt::SolidPattern) { + d->colorBrush.setStyle(Qt::SolidPattern); + d->colorBrush.setColor(brush.color()); + setBrush(d->colorBrush); + } else { + setBrush(brush); + } + + drawRect(r); + setBrush(oldBrush); + setPen(oldPen); +} + + + +/*! + \fn void QPainter::fillRect(const QRect &rectangle, const QColor &color) + \overload + + Fills the given \a rectangle with the \a color specified. + + \since 4.5 +*/ +void QPainter::fillRect(const QRect &r, const QColor &color) +{ + Q_D(QPainter); + + if (!d->engine) + return; + + if (d->extended) { + d->extended->fillRect(r, color); + return; + } + + fillRect(r, QBrush(color)); +} + + +/*! + \fn void QPainter::fillRect(const QRectF &rectangle, const QColor &color) + \overload + + Fills the given \a rectangle with the \a color specified. + + \since 4.5 +*/ +void QPainter::fillRect(const QRectF &r, const QColor &color) +{ + Q_D(QPainter); + + if (!d->engine) + return; + + if (d->extended) { + d->extended->fillRect(r, color); + return; + } + + fillRect(r, QBrush(color)); +} + +/*! + \fn void QPainter::fillRect(int x, int y, int width, int height, const QBrush &brush) + + \overload + + Fills the rectangle beginning at (\a{x}, \a{y}) with the given \a + width and \a height, using the given \a brush. +*/ + +/*! + \fn void QPainter::fillRect(int x, int y, int width, int height, const QColor &color) + + \overload + + Fills the rectangle beginning at (\a{x}, \a{y}) with the given \a + width and \a height, using the given \a color. + + \since 4.5 +*/ + +/*! + \fn void QPainter::fillRect(int x, int y, int width, int height, Qt::GlobalColor color) + + \overload + + Fills the rectangle beginning at (\a{x}, \a{y}) with the given \a + width and \a height, using the given \a color. + + \since 4.5 +*/ + +/*! + \fn void QPainter::fillRect(const QRect &rectangle, Qt::GlobalColor color); + + \overload + + Fills the given \a rectangle with the specified \a color. + + \since 4.5 +*/ + +/*! + \fn void QPainter::fillRect(const QRectF &rectangle, Qt::GlobalColor color); + + \overload + + Fills the given \a rectangle with the specified \a color. + + \since 4.5 +*/ + +/*! + Sets the given render \a hint on the painter if \a on is true; + otherwise clears the render hint. + + \sa setRenderHints(), renderHints(), {QPainter#Rendering + Quality}{Rendering Quality} +*/ +void QPainter::setRenderHint(RenderHint hint, bool on) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::setRenderHint: hint=%x, %s\n", hint, on ? "on" : "off"); +#endif + +#ifndef QT_NO_DEBUG + static const bool antialiasingDisabled = qgetenv("QT_NO_ANTIALIASING").toInt(); + if (hint == QPainter::Antialiasing && antialiasingDisabled) + return; +#endif + + setRenderHints(hint, on); +} + +/*! + \since 4.2 + + Sets the given render \a hints on the painter if \a on is true; + otherwise clears the render hints. + + \sa setRenderHint(), renderHints(), {QPainter#Rendering + Quality}{Rendering Quality} +*/ + +void QPainter::setRenderHints(RenderHints hints, bool on) +{ + Q_D(QPainter); + + if (!d->engine) { + qWarning("QPainter::setRenderHint: Painter must be active to set rendering hints"); + return; + } + + if (on) + d->state->renderHints |= hints; + else + d->state->renderHints &= ~hints; + + if (d->extended) + d->extended->renderHintsChanged(); + else + d->state->dirtyFlags |= QPaintEngine::DirtyHints; +} + +/*! + Returns a flag that specifies the rendering hints that are set for + this painter. + + \sa testRenderHint(), {QPainter#Rendering Quality}{Rendering Quality} +*/ +QPainter::RenderHints QPainter::renderHints() const +{ + Q_D(const QPainter); + + if (!d->engine) + return 0; + + return d->state->renderHints; +} + +/*! + \fn bool QPainter::testRenderHint(RenderHint hint) const + \since 4.3 + + Returns true if \a hint is set; otherwise returns false. + + \sa renderHints(), setRenderHint() +*/ + +/*! + Returns true if view transformation is enabled; otherwise returns + false. + + \sa setViewTransformEnabled(), worldMatrix() +*/ + +bool QPainter::viewTransformEnabled() const +{ + Q_D(const QPainter); + if (!d->engine) { + qWarning("QPainter::viewTransformEnabled: Painter not active"); + return false; + } + return d->state->VxF; +} + +/*! + \fn void QPainter::setWindow(const QRect &rectangle) + + Sets the painter's window to the given \a rectangle, and enables + view transformations. + + The window rectangle is part of the view transformation. The + window specifies the logical coordinate system. Its sister, the + viewport(), specifies the device coordinate system. + + The default window rectangle is the same as the device's + rectangle. + + \sa window(), viewTransformEnabled(), {The Coordinate + System#Window-Viewport Conversion}{Window-Viewport Conversion} +*/ + +/*! + \fn void QPainter::setWindow(int x, int y, int width, int height) + \overload + + Sets the painter's window to the rectangle beginning at (\a x, \a + y) and the given \a width and \a height. +*/ + +void QPainter::setWindow(const QRect &r) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::setWindow(), [%d,%d,%d,%d]\n", r.x(), r.y(), r.width(), r.height()); +#endif + + Q_D(QPainter); + + if (!d->engine) { + qWarning("QPainter::setWindow: Painter not active"); + return; + } + + d->state->wx = r.x(); + d->state->wy = r.y(); + d->state->ww = r.width(); + d->state->wh = r.height(); + + d->state->VxF = true; + d->updateMatrix(); +} + +/*! + Returns the window rectangle. + + \sa setWindow(), setViewTransformEnabled() +*/ + +QRect QPainter::window() const +{ + Q_D(const QPainter); + if (!d->engine) { + qWarning("QPainter::window: Painter not active"); + return QRect(); + } + return QRect(d->state->wx, d->state->wy, d->state->ww, d->state->wh); +} + +/*! + \fn void QPainter::setViewport(const QRect &rectangle) + + Sets the painter's viewport rectangle to the given \a rectangle, + and enables view transformations. + + The viewport rectangle is part of the view transformation. The + viewport specifies the device coordinate system. Its sister, the + window(), specifies the logical coordinate system. + + The default viewport rectangle is the same as the device's + rectangle. + + \sa viewport(), viewTransformEnabled() {The Coordinate + System#Window-Viewport Conversion}{Window-Viewport Conversion} +*/ + +/*! + \fn void QPainter::setViewport(int x, int y, int width, int height) + \overload + + Sets the painter's viewport rectangle to be the rectangle + beginning at (\a x, \a y) with the given \a width and \a height. +*/ + +void QPainter::setViewport(const QRect &r) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::setViewport(), [%d,%d,%d,%d]\n", r.x(), r.y(), r.width(), r.height()); +#endif + + Q_D(QPainter); + + if (!d->engine) { + qWarning("QPainter::setViewport: Painter not active"); + return; + } + + d->state->vx = r.x(); + d->state->vy = r.y(); + d->state->vw = r.width(); + d->state->vh = r.height(); + + d->state->VxF = true; + d->updateMatrix(); +} + +/*! + Returns the viewport rectangle. + + \sa setViewport(), setViewTransformEnabled() +*/ + +QRect QPainter::viewport() const +{ + Q_D(const QPainter); + if (!d->engine) { + qWarning("QPainter::viewport: Painter not active"); + return QRect(); + } + return QRect(d->state->vx, d->state->vy, d->state->vw, d->state->vh); +} + +/*! \fn bool QPainter::hasViewXForm() const + \compat + + Use viewTransformEnabled() instead. +*/ + +/*! \fn bool QPainter::hasWorldXForm() const + \compat + + Use worldMatrixEnabled() instead. +*/ + +/*! \fn void QPainter::resetXForm() + \compat + + Use resetMatrix() instead. +*/ + +/*! \fn void QPainter::setViewXForm(bool enabled) + \compat + + Use setViewTransformEnabled() instead. +*/ + +/*! \fn void QPainter::setWorldXForm(bool enabled) + \compat + + Use setWorldMatrixEnabled() instead. +*/ +/*! + Enables view transformations if \a enable is true, or disables + view transformations if \a enable is false. + + \sa viewTransformEnabled(), {The Coordinate System#Window-Viewport + Conversion}{Window-Viewport Conversion} +*/ + +void QPainter::setViewTransformEnabled(bool enable) +{ +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::setViewTransformEnabled(), enable=%d\n", enable); +#endif + + Q_D(QPainter); + + if (!d->engine) { + qWarning("QPainter::setViewTransformEnabled: Painter not active"); + return; + } + + if (enable == d->state->VxF) + return; + + d->state->VxF = enable; + d->updateMatrix(); +} + +#ifdef QT3_SUPPORT + +/*! + Use the worldMatrix() combined with QMatrix::dx() instead. + + \oldcode + QPainter painter(this); + qreal x = painter.translationX(); + \newcode + QPainter painter(this); + qreal x = painter.worldMatrix().dx(); + \endcode +*/ +qreal QPainter::translationX() const +{ + Q_D(const QPainter); + if (!d->engine) { + qWarning("QPainter::translationX: Painter not active"); + return 0.0; + } + return d->state->worldMatrix.dx(); +} + +/*! + Use the worldMatrix() combined with QMatrix::dy() instead. + + \oldcode + QPainter painter(this); + qreal y = painter.translationY(); + \newcode + QPainter painter(this); + qreal y = painter.worldMatrix().dy(); + \endcode +*/ +qreal QPainter::translationY() const +{ + Q_D(const QPainter); + if (!d->engine) { + qWarning("QPainter::translationY: Painter not active"); + return 0.0; + } + return d->state->worldMatrix.dy(); +} + +/*! + \fn void QPainter::map(int x, int y, int *rx, int *ry) const + + \internal + + Sets (\a{rx}, \a{ry}) to the point that results from applying the + painter's current transformation on the point (\a{x}, \a{y}). +*/ +void QPainter::map(int x, int y, int *rx, int *ry) const +{ + QPoint p(x, y); + p = p * combinedMatrix(); + *rx = p.x(); + *ry = p.y(); +} + +/*! + \fn QPoint QPainter::xForm(const QPoint &point) const + + Use combinedTransform() instead. +*/ + +QPoint QPainter::xForm(const QPoint &p) const +{ + Q_D(const QPainter); + if (!d->engine) { + qWarning("QPainter::xForm: Painter not active"); + return QPoint(); + } + if (d->state->matrix.type() == QTransform::TxNone) + return p; + return p * combinedMatrix(); +} + + +/*! + \fn QRect QPainter::xForm(const QRect &rectangle) const + \overload + + Use combinedTransform() instead of this function and call + mapRect() on the result to obtain a QRect. +*/ + +QRect QPainter::xForm(const QRect &r) const +{ + Q_D(const QPainter); + if (!d->engine) { + qWarning("QPainter::xForm: Painter not active"); + return QRect(); + } + if (d->state->matrix.type() == QTransform::TxNone) + return r; + return combinedMatrix().mapRect(r); +} + +/*! + \fn QPolygon QPainter::xForm(const QPolygon &polygon) const + \overload + + Use combinedTransform() instead. +*/ + +QPolygon QPainter::xForm(const QPolygon &a) const +{ + Q_D(const QPainter); + if (!d->engine) { + qWarning("QPainter::xForm: Painter not active"); + return QPolygon(); + } + if (d->state->matrix.type() == QTransform::TxNone) + return a; + return a * combinedMatrix(); +} + +/*! + \fn QPolygon QPainter::xForm(const QPolygon &polygon, int index, int count) const + \overload + + Use combinedTransform() combined with QPolygon::mid() instead. + + \oldcode + QPainter painter(this); + QPolygon transformed = painter.xForm(polygon, index, count) + \newcode + QPainter painter(this); + QPolygon transformed = polygon.mid(index, count) * painter.combinedMatrix(); + \endcode +*/ + +QPolygon QPainter::xForm(const QPolygon &av, int index, int npoints) const +{ + int lastPoint = npoints < 0 ? av.size() : index+npoints; + QPolygon a(lastPoint-index); + memcpy(a.data(), av.data()+index, (lastPoint-index)*sizeof(QPoint)); + return a * combinedMatrix(); +} + +/*! + \fn QPoint QPainter::xFormDev(const QPoint &point) const + \overload + + Use combinedTransform() combined with QMatrix::inverted() instead. + + \oldcode + QPainter painter(this); + QPoint transformed = painter.xFormDev(point); + \newcode + QPainter painter(this); + QPoint transformed = point * painter.combinedMatrix().inverted(); + \endcode +*/ + +QPoint QPainter::xFormDev(const QPoint &p) const +{ + Q_D(const QPainter); + if (!d->engine) { + qWarning("QPainter::xFormDev: Painter not active"); + return QPoint(); + } + if(d->state->matrix.type() == QTransform::TxNone) + return p; + return p * combinedMatrix().inverted(); +} + +/*! + \fn QRect QPainter::xFormDev(const QRect &rectangle) const + \overload + + Use combineMatrix() combined with QMatrix::inverted() instead. + + \oldcode + QPainter painter(this); + QRect transformed = painter.xFormDev(rectangle); + \newcode + QPainter painter(this); + QRect transformed = rectangle * painter.combinedMatrix().inverted(); + \endcode +*/ + +QRect QPainter::xFormDev(const QRect &r) const +{ + Q_D(const QPainter); + if (!d->engine) { + qWarning("QPainter::xFormDev: Painter not active"); + return QRect(); + } + if (d->state->matrix.type() == QTransform::TxNone) + return r; + return combinedMatrix().inverted().mapRect(r); +} + +/*! + \overload + + \fn QPoint QPainter::xFormDev(const QPolygon &polygon) const + \overload + + Use combinedMatrix() combined with QMatrix::inverted() instead. + + \oldcode + QPainter painter(this); + QPolygon transformed = painter.xFormDev(rectangle); + \newcode + QPainter painter(this); + QPolygon transformed = polygon * painter.combinedMatrix().inverted(); + \endcode +*/ + +QPolygon QPainter::xFormDev(const QPolygon &a) const +{ + Q_D(const QPainter); + if (!d->engine) { + qWarning("QPainter::xFormDev: Painter not active"); + return QPolygon(); + } + if (d->state->matrix.type() == QTransform::TxNone) + return a; + return a * combinedMatrix().inverted(); +} + +/*! + \fn QPolygon QPainter::xFormDev(const QPolygon &polygon, int index, int count) const + \overload + + Use combinedMatrix() combined with QPolygon::mid() and QMatrix::inverted() instead. + + \oldcode + QPainter painter(this); + QPolygon transformed = painter.xFormDev(polygon, index, count); + \newcode + QPainter painter(this); + QPolygon transformed = polygon.mid(index, count) * painter.combinedMatrix().inverted(); + \endcode +*/ + +QPolygon QPainter::xFormDev(const QPolygon &ad, int index, int npoints) const +{ + Q_D(const QPainter); + int lastPoint = npoints < 0 ? ad.size() : index+npoints; + QPolygon a(lastPoint-index); + memcpy(a.data(), ad.data()+index, (lastPoint-index)*sizeof(QPoint)); + if (d->state->matrix.type() == QTransform::TxNone) + return a; + return a * combinedMatrix().inverted(); +} + +/*! + \fn void QPainter::drawCubicBezier(const QPolygon &controlPoints, int index) + + Draws a cubic Bezier curve defined by the \a controlPoints, + starting at \a{controlPoints}\e{[index]} (\a index defaults to 0). + Points after \a{controlPoints}\e{[index + 3]} are ignored. Nothing + happens if there aren't enough control points. + + Use strokePath() instead. + + \oldcode + QPainter painter(this); + painter.drawCubicBezier(controlPoints, index) + \newcode + QPainterPath path; + path.moveTo(controlPoints.at(index)); + path.cubicTo(controlPoints.at(index+1), + controlPoints.at(index+2), + controlPoints.at(index+3)); + + QPainter painter(this); + painter.strokePath(path, painter.pen()); + \endcode +*/ +void QPainter::drawCubicBezier(const QPolygon &a, int index) +{ + Q_D(QPainter); + + if (!d->engine) + return; + + if ((int)a.size() - index < 4) { + qWarning("QPainter::drawCubicBezier: Cubic Bezier needs 4 control " + "points"); + return; + } + + QPainterPath path; + path.moveTo(a.at(index)); + path.cubicTo(a.at(index+1), a.at(index+2), a.at(index+3)); + strokePath(path, d->state->pen); +} +#endif + +struct QPaintDeviceRedirection +{ + QPaintDeviceRedirection() : device(0), replacement(0), internalWidgetRedirectionIndex(-1) {} + QPaintDeviceRedirection(const QPaintDevice *device, QPaintDevice *replacement, + const QPoint& offset, int internalWidgetRedirectionIndex) + : device(device), replacement(replacement), offset(offset), + internalWidgetRedirectionIndex(internalWidgetRedirectionIndex) { } + const QPaintDevice *device; + QPaintDevice *replacement; + QPoint offset; + int internalWidgetRedirectionIndex; + bool operator==(const QPaintDevice *pdev) const { return device == pdev; } + Q_DUMMY_COMPARISON_OPERATOR(QPaintDeviceRedirection) +}; + +typedef QList<QPaintDeviceRedirection> QPaintDeviceRedirectionList; +Q_GLOBAL_STATIC(QPaintDeviceRedirectionList, globalRedirections) +Q_GLOBAL_STATIC(QMutex, globalRedirectionsMutex) + +/*! + \threadsafe + + Redirects all paint commands for the given paint \a device, to the + \a replacement device. The optional point \a offset defines an + offset within the source device. + + The redirection will not be effective until the begin() function + has been called; make sure to call end() for the given \a + device's painter (if any) before redirecting. Call + restoreRedirected() to restore the previous redirection. + + In general, you'll probably find that calling + QPixmap::grabWidget() or QPixmap::grabWindow() is an easier + solution. + + \sa redirected(), restoreRedirected() +*/ +void QPainter::setRedirected(const QPaintDevice *device, + QPaintDevice *replacement, + const QPoint &offset) +{ + Q_ASSERT(device != 0); + + bool hadInternalWidgetRedirection = false; + if (device->devType() == QInternal::Widget) { + const QWidgetPrivate *widgetPrivate = static_cast<const QWidget *>(device)->d_func(); + // This is the case when the widget is in a paint event. + if (widgetPrivate->redirectDev) { + // Remove internal redirection and put it back into the global redirection list. + QPoint oldOffset; + QPaintDevice *oldReplacement = widgetPrivate->redirected(&oldOffset); + const_cast<QWidgetPrivate *>(widgetPrivate)->restoreRedirected(); + setRedirected(device, oldReplacement, oldOffset); + hadInternalWidgetRedirection = true; + } + } + + QPoint roffset; + QPaintDevice *rdev = redirected(replacement, &roffset); + + QMutexLocker locker(globalRedirectionsMutex()); + QPaintDeviceRedirectionList *redirections = globalRedirections(); + Q_ASSERT(redirections != 0); + *redirections += QPaintDeviceRedirection(device, rdev ? rdev : replacement, offset + roffset, + hadInternalWidgetRedirection ? redirections->size() - 1 : -1); +} + +/*! + \threadsafe + + Restores the previous redirection for the given \a device after a + call to setRedirected(). + + \sa redirected() + */ +void QPainter::restoreRedirected(const QPaintDevice *device) +{ + Q_ASSERT(device != 0); + QMutexLocker locker(globalRedirectionsMutex()); + QPaintDeviceRedirectionList *redirections = globalRedirections(); + Q_ASSERT(redirections != 0); + for (int i = redirections->size()-1; i >= 0; --i) { + if (redirections->at(i) == device) { + const int internalWidgetRedirectionIndex = redirections->at(i).internalWidgetRedirectionIndex; + redirections->removeAt(i); + // Restore the internal widget redirection, i.e. remove it from the global + // redirection list and put it back into QWidgetPrivate. The index is only set when + // someone call QPainter::setRedirected in a widget's paint event and we internally + // have a redirection set (typically set in QWidgetPrivate::drawWidget). + if (internalWidgetRedirectionIndex >= 0) { + Q_ASSERT(internalWidgetRedirectionIndex < redirections->size()); + const QPaintDeviceRedirection &redirectionDevice = redirections->at(internalWidgetRedirectionIndex); + QWidget *widget = static_cast<QWidget *>(const_cast<QPaintDevice *>(device)); + widget->d_func()->setRedirected(redirectionDevice.replacement, redirectionDevice.offset); + redirections->removeAt(internalWidgetRedirectionIndex); + } + return; + } + } +} + +/*! + \threadsafe + + Returns the replacement for given \a device. The optional out + parameter \a offset returns the offset within the replaced device. + + \sa setRedirected(), restoreRedirected() +*/ +QPaintDevice *QPainter::redirected(const QPaintDevice *device, QPoint *offset) +{ + Q_ASSERT(device != 0); + + if (device->devType() == QInternal::Widget) { + const QWidgetPrivate *widgetPrivate = static_cast<const QWidget *>(device)->d_func(); + if (widgetPrivate->redirectDev) + return widgetPrivate->redirected(offset); + } + + QMutexLocker locker(globalRedirectionsMutex()); + QPaintDeviceRedirectionList *redirections = globalRedirections(); + Q_ASSERT(redirections != 0); + for (int i = redirections->size()-1; i >= 0; --i) + if (redirections->at(i) == device) { + if (offset) + *offset = redirections->at(i).offset; + return redirections->at(i).replacement; + } + if (offset) + *offset = QPoint(0, 0); + return 0; +} + + +void qt_painter_removePaintDevice(QPaintDevice *dev) +{ + QMutexLocker locker(globalRedirectionsMutex()); + if(QPaintDeviceRedirectionList *redirections = globalRedirections()) { + for (int i = 0; i < redirections->size(); ) { + if(redirections->at(i) == dev || redirections->at(i).replacement == dev) + redirections->removeAt(i); + else + ++i; + } + } +} + +void qt_format_text(const QFont &fnt, const QRectF &_r, + int tf, const QString& str, QRectF *brect, + int tabstops, int *ta, int tabarraylen, + QPainter *painter) +{ + qt_format_text(fnt, _r, + tf, 0, str, brect, + tabstops, ta, tabarraylen, + painter); +} +void qt_format_text(const QFont &fnt, const QRectF &_r, + int tf, const QTextOption *option, const QString& str, QRectF *brect, + int tabstops, int *, int tabarraylen, + QPainter *painter) +{ + + Q_ASSERT( !((tf & ~Qt::TextDontPrint)!=0 && option!=0) ); // we either have an option or flags + + if (option) { + tf |= option->alignment(); + if (option->wrapMode() != QTextOption::NoWrap) + tf |= Qt::TextWordWrap; + + if (option->flags() & QTextOption::IncludeTrailingSpaces) + tf |= Qt::TextIncludeTrailingSpaces; + + if (option->tabStop() >= 0 || !option->tabArray().isEmpty()) + tf |= Qt::TextExpandTabs; + } + + // we need to copy r here to protect against the case (&r == brect). + QRectF r(_r); + + bool dontclip = (tf & Qt::TextDontClip); + bool wordwrap = (tf & Qt::TextWordWrap) || (tf & Qt::TextWrapAnywhere); + bool singleline = (tf & Qt::TextSingleLine); + bool showmnemonic = (tf & Qt::TextShowMnemonic); + bool hidemnmemonic = (tf & Qt::TextHideMnemonic); + + Qt::LayoutDirection layout_direction; + if(option) + layout_direction = option->textDirection(); + else if (painter) + layout_direction = painter->layoutDirection(); + else + layout_direction = Qt::LeftToRight; + + tf = QStyle::visualAlignment(layout_direction, QFlag(tf)); + + bool isRightToLeft = layout_direction == Qt::RightToLeft; + bool expandtabs = ((tf & Qt::TextExpandTabs) && + (((tf & Qt::AlignLeft) && !isRightToLeft) || + ((tf & Qt::AlignRight) && isRightToLeft))); + + if (!painter) + tf |= Qt::TextDontPrint; + + int maxUnderlines = 0; + int numUnderlines = 0; + int underlinePositionStack[32]; + int *underlinePositions = underlinePositionStack; + + QFontMetricsF fm(fnt); + + QString text = str; + // compatible behaviour to the old implementation. Replace + // tabs by spaces + QChar *chr = text.data(); + const QChar *end = chr + str.length(); + bool has_tab = false; + while (chr != end) { + if (*chr == QLatin1Char('\r') || (singleline && *chr == QLatin1Char('\n'))) { + *chr = QLatin1Char(' '); + } else if (*chr == QLatin1Char('\n')) { + *chr = QChar::LineSeparator; + } else if (*chr == QLatin1Char('&')) { + ++maxUnderlines; + } else if (*chr == QLatin1Char('\t')) { + has_tab = true; + } + ++chr; + } + if (has_tab) { + if (!expandtabs) { + chr = text.data(); + while (chr != end) { + if (*chr == QLatin1Char('\t')) + *chr = QLatin1Char(' '); + ++chr; + } + } else if (!tabarraylen && !tabstops) { + tabstops = qRound(fm.width(QLatin1Char('x'))*8); + } + } + + if (hidemnmemonic || showmnemonic) { + if (maxUnderlines > 32) + underlinePositions = new int[maxUnderlines]; + QChar *cout = text.data(); + QChar *cin = cout; + int l = str.length(); + while (l) { + if (*cin == QLatin1Char('&')) { + ++cin; + --l; + if (!l) + break; + if (*cin != QLatin1Char('&') && !hidemnmemonic) + underlinePositions[numUnderlines++] = cout - text.unicode(); + } + *cout = *cin; + ++cout; + ++cin; + --l; + } + int newlen = cout - text.unicode(); + if (newlen != text.length()) + text.resize(newlen); + } + + // no need to do extra work for underlines if we don't paint + if (tf & Qt::TextDontPrint) + numUnderlines = 0; + + underlinePositions[numUnderlines] = -1; + qreal height = 0; + qreal width = 0; + + QStackTextEngine engine(text, fnt); + if (option) { + engine.option = *option; + } + + + + engine.option.setTextDirection(layout_direction); + if (tf & Qt::AlignJustify) + engine.option.setAlignment(Qt::AlignJustify); + else + engine.option.setAlignment(Qt::AlignLeft); // do not do alignment twice + + if (!option && (tf & Qt::TextWrapAnywhere)) + engine.option.setWrapMode(QTextOption::WrapAnywhere); + + if (tf & Qt::TextJustificationForced) + engine.forceJustification = true; + QTextLayout textLayout(&engine); + textLayout.setCacheEnabled(true); + textLayout.engine()->underlinePositions = underlinePositions; + + if (text.isEmpty()) { + height = fm.height(); + width = 0; + tf |= Qt::TextDontPrint; + } else { + qreal lineWidth = 0x01000000; + if (wordwrap || (tf & Qt::TextJustificationForced)) + lineWidth = qMax<qreal>(0, r.width()); + if(!wordwrap) + tf |= Qt::TextIncludeTrailingSpaces; + textLayout.engine()->ignoreBidi = bool(tf & Qt::TextDontPrint); + textLayout.beginLayout(); + + qreal leading = fm.leading(); + height = -leading; + + while (1) { + QTextLine l = textLayout.createLine(); + if (!l.isValid()) + break; + + l.setLineWidth(lineWidth); + height += leading; + l.setPosition(QPointF(0., height)); + height += l.height(); + width = qMax(width, l.naturalTextWidth()); + if (!brect && height >= r.height()) + break; + } + textLayout.endLayout(); + } + + qreal yoff = 0; + qreal xoff = 0; + if (tf & Qt::AlignBottom) { + yoff = r.height() - height; + } else if (tf & Qt::AlignVCenter) { + yoff = (r.height() - height)/2; + if (painter) { + QTransform::TransformationType type = painter->transform().type(); + if (type <= QTransform::TxScale) { + // do the rounding manually to work around inconsistencies + // in the paint engines when drawing on floating point offsets + const qreal scale = painter->transform().m22(); + if (scale != 0) + yoff = qRound(yoff * scale) / scale; + } + } + } + if (tf & Qt::AlignRight) { + xoff = r.width() - width; + } else if (tf & Qt::AlignHCenter) { + xoff = (r.width() - width)/2; + if (painter) { + QTransform::TransformationType type = painter->transform().type(); + if (type <= QTransform::TxScale) { + // do the rounding manually to work around inconsistencies + // in the paint engines when drawing on floating point offsets + const qreal scale = painter->transform().m11(); + if (scale != 0) + xoff = qRound(xoff * scale) / scale; + } + } + } + QRectF bounds = QRectF(r.x() + xoff, r.y() + yoff, width, height); + if (brect) + *brect = bounds; + + if (!(tf & Qt::TextDontPrint)) { + bool restore = false; + if (!dontclip && !r.contains(bounds)) { + restore = true; + painter->save(); + painter->setClipRect(r, Qt::IntersectClip); + } + + for (int i = 0; i < textLayout.lineCount(); i++) { + QTextLine line = textLayout.lineAt(i); + + if (tf & Qt::AlignRight) + xoff = r.width() - line.naturalTextWidth(); + else if (tf & Qt::AlignHCenter) + xoff = (r.width() - line.naturalTextWidth())/2; + + line.draw(painter, QPointF(r.x() + xoff + line.x(), r.y() + yoff)); + } + + if (restore) { + painter->restore(); + } + } + + if (underlinePositions != underlinePositionStack) + delete [] underlinePositions; +} + +/*! + Sets the layout direction used by the painter when drawing text, + to the specified \a direction. + + \sa layoutDirection(), drawText(), {QPainter#Settings}{Settings} +*/ +void QPainter::setLayoutDirection(Qt::LayoutDirection direction) +{ + Q_D(QPainter); + if (d->state) + d->state->layoutDirection = direction; +} + +/*! + Returns the layout direction used by the painter when drawing text. + + \sa setLayoutDirection(), drawText(), {QPainter#Settings}{Settings} +*/ +Qt::LayoutDirection QPainter::layoutDirection() const +{ + Q_D(const QPainter); + return d->state ? d->state->layoutDirection : Qt::LeftToRight; +} + +QPainterState::QPainterState(const QPainterState *s) + : brushOrigin(s->brushOrigin), font(s->font), deviceFont(s->deviceFont), + pen(s->pen), brush(s->brush), bgBrush(s->bgBrush), + clipRegion(s->clipRegion), clipPath(s->clipPath), + clipOperation(s->clipOperation), + renderHints(s->renderHints), clipInfo(s->clipInfo), + worldMatrix(s->worldMatrix), matrix(s->matrix), redirection_offset(s->redirection_offset), + wx(s->wx), wy(s->wy), ww(s->ww), wh(s->wh), + vx(s->vx), vy(s->vy), vw(s->vw), vh(s->vh), + opacity(s->opacity), WxF(s->WxF), VxF(s->VxF), + clipEnabled(s->clipEnabled), bgMode(s->bgMode), painter(s->painter), + layoutDirection(s->layoutDirection), + composition_mode(s->composition_mode), + emulationSpecifier(s->emulationSpecifier), changeFlags(0) +{ + dirtyFlags = s->dirtyFlags; +} + +QPainterState::QPainterState() + : brushOrigin(0, 0), bgBrush(Qt::white), clipOperation(Qt::NoClip), + renderHints(0), + wx(0), wy(0), ww(0), wh(0), vx(0), vy(0), vw(0), vh(0), + opacity(1), WxF(false), VxF(false), clipEnabled(true), + bgMode(Qt::TransparentMode), painter(0), + layoutDirection(QApplication::layoutDirection()), + composition_mode(QPainter::CompositionMode_SourceOver), + emulationSpecifier(0), changeFlags(0) +{ + dirtyFlags = 0; +} + +QPainterState::~QPainterState() +{ +} + +void QPainterState::init(QPainter *p) { + bgBrush = Qt::white; + bgMode = Qt::TransparentMode; + WxF = false; + VxF = false; + clipEnabled = true; + wx = wy = ww = wh = 0; + vx = vy = vw = vh = 0; + painter = p; + pen = QPen(); + brushOrigin = QPointF(0, 0); + brush = QBrush(); + font = deviceFont = QFont(); + clipRegion = QRegion(); + clipPath = QPainterPath(); + clipOperation = Qt::NoClip; + clipInfo.clear(); + worldMatrix.reset(); + matrix.reset(); + layoutDirection = QApplication::layoutDirection(); + composition_mode = QPainter::CompositionMode_SourceOver; + emulationSpecifier = 0; + dirtyFlags = 0; + changeFlags = 0; + renderHints = 0; + opacity = 1; +} + +#ifdef QT3_SUPPORT +static void bitBlt_helper(QPaintDevice *dst, const QPoint &dp, + const QPaintDevice *src, const QRect &sr, bool) +{ + Q_ASSERT(dst); + Q_ASSERT(src); + + if (src->devType() == QInternal::Pixmap) { + const QPixmap *pixmap = static_cast<const QPixmap *>(src); + QPainter pt(dst); + pt.drawPixmap(dp, *pixmap, sr); + + } else { + qWarning("QPainter: bitBlt only works when source is of type pixmap"); + } +} + +void bitBlt(QPaintDevice *dst, int dx, int dy, + const QPaintDevice *src, int sx, int sy, int sw, int sh, + bool ignoreMask ) +{ + bitBlt_helper(dst, QPoint(dx, dy), src, QRect(sx, sy, sw, sh), ignoreMask); +} + +void bitBlt(QPaintDevice *dst, const QPoint &dp, const QPaintDevice *src, const QRect &sr, bool ignoreMask) +{ + bitBlt_helper(dst, dp, src, sr, ignoreMask); +} + +void bitBlt(QPaintDevice *dst, int dx, int dy, + const QImage *src, int sx, int sy, int sw, int sh, int fl) +{ + Qt::ImageConversionFlags flags(fl); + QPixmap srcPixmap = QPixmap::fromImage(*src, flags); + bitBlt_helper(dst, QPoint(dx, dy), &srcPixmap, QRect(sx, sy, sw, sh), false); +} + +#endif // QT3_SUPPORT + +/*! + \fn void QPainter::setBackgroundColor(const QColor &color) + + Use setBackground() instead. +*/ + +/*! + \fn const QColor &QPainter::backgroundColor() const + + Use background() and QBrush::color() instead. + + \oldcode + QColor myColor = backgroundColor(); + \newcode + QColor myColor = background().color(); + \endcode + + Note that the background can be a complex brush such as a texture + or a gradient. +*/ + +/*! + \fn void QPainter::drawText(int x, int y, const QString &text, int pos, int length) + \compat + + Use drawText() combined with QString::mid() instead. + + \oldcode + QPainter painter(this); + painter.drawText(x, y, text, pos, length); + \newcode + QPainter painter(this); + painter.drawText(x, y, text.mid(pos, length)); + \endcode +*/ + +/*! + \fn void QPainter::drawText(const QPoint &point, const QString &text, int pos, int length) + \compat + + Use drawText() combined with QString::mid() instead. + + \oldcode + QPainter painter(this); + painter.drawText(point, text, pos, length); + \newcode + QPainter painter(this); + painter.drawText(point, text.mid(pos, length)); + \endcode +*/ + +/*! + \fn void QPainter::drawText(int x, int y, const QString &text, int length) + \compat + + Use drawText() combined with QString::left() instead. + + \oldcode + QPainter painter(this); + painter.drawText(x, y, text, length); + \newcode + QPainter painter(this); + painter.drawText(x, y, text.left(length)); + \endcode +*/ + +/*! + \fn void QPainter::drawText(const QPoint &point, const QString &text, int length) + \compat + + Use drawText() combined with QString::left() instead. + + \oldcode + QPainter painter(this); + painter.drawText(point, text, length); + \newcode + QPainter painter(this); + painter.drawText(point, text.left(length)); + \endcode +*/ + +/*! + \fn bool QPainter::begin(QPaintDevice *device, const QWidget *init) + \compat + + Use begin() instead. + + If the paint \a device is a QWidget, QPainter is initialized after + the widget's settings automatically. Otherwise, you must call the + initFrom() function to initialize the painters pen, background and + font to the same as any given widget. + + \oldcode + QPainter painter(this); + painter.begin(device, init); + \newcode + QPainter painter(this); + painter.begin(device); + painter.initFrom(init); + \endcode +*/ + +/*! + \fn void QPainter::drawImage(const QRectF &target, const QImage &image, const QRectF &source, + Qt::ImageConversionFlags flags) + + Draws the rectangular portion \a source of the given \a image + into the \a target rectangle in the paint device. + + \note The image is scaled to fit the rectangle, if both the image and rectangle size disagree. + + If the image needs to be modified to fit in a lower-resolution + result (e.g. converting from 32-bit to 8-bit), use the \a flags to + specify how you would prefer this to happen. + + \table 100% + \row + \o + \snippet doc/src/snippets/code/src_gui_painting_qpainter.cpp 20 + \endtable + + \sa drawPixmap() +*/ + +/*! + \fn void QPainter::drawImage(const QRect &target, const QImage &image, const QRect &source, + Qt::ImageConversionFlags flags) + \overload + + Draws the rectangular portion \a source of the given \a image + into the \a target rectangle in the paint device. + + \note The image is scaled to fit the rectangle, if both the image and rectangle size disagree. +*/ + +/*! + \fn void QPainter::drawImage(const QPointF &point, const QImage &image) + + \overload + + Draws the given \a image at the given \a point. +*/ + +/*! + \fn void QPainter::drawImage(const QPoint &point, const QImage &image) + + \overload + + Draws the given \a image at the given \a point. +*/ + +/*! + \fn void QPainter::drawImage(const QPointF &point, const QImage &image, const QRectF &source, + Qt::ImageConversionFlags flags = 0) + + \overload + + Draws the rectangular portion \a source of the given \a image with + its origin at the given \a point. +*/ + +/*! + \fn void QPainter::drawImage(const QPoint &point, const QImage &image, const QRect &source, + Qt::ImageConversionFlags flags = 0) + \overload + + Draws the rectangular portion \a source of the given \a image with + its origin at the given \a point. +*/ + +/*! + \fn void QPainter::drawImage(const QRectF &rectangle, const QImage &image) + + \overload + + Draws the given \a image into the given \a rectangle. + + \note The image is scaled to fit the rectangle, if both the image and rectangle size disagree. +*/ + +/*! + \fn void QPainter::drawImage(const QRect &rectangle, const QImage &image) + + \overload + + Draws the given \a image into the given \a rectangle. + + \note The image is scaled to fit the rectangle, if both the image and rectangle size disagree. +*/ + +/*! + \fn void QPainter::drawImage(int x, int y, const QImage &image, + int sx, int sy, int sw, int sh, + Qt::ImageConversionFlags flags) + \overload + + Draws an image at (\a{x}, \a{y}) by copying a part of \a image into + the paint device. + + (\a{x}, \a{y}) specifies the top-left point in the paint device that is + to be drawn onto. (\a{sx}, \a{sy}) specifies the top-left point in \a + image that is to be drawn. The default is (0, 0). + + (\a{sw}, \a{sh}) specifies the size of the image that is to be drawn. + The default, (0, 0) (and negative) means all the way to the + bottom-right of the image. +*/ + +/*! + \fn void QPainter::redirect(QPaintDevice *pdev, QPaintDevice *replacement) + + Use setRedirected() instead. +*/ + +/*! + \fn QPaintDevice *QPainter::redirect(QPaintDevice *pdev) + + Use redirected() instead. +*/ + +/*! + \fn QRect QPainter::boundingRect(const QRect &rectangle, int flags, + const QString &text, int length) + \compat + + Returns the bounding rectangle for the given \a length of the \a + text constrained by the provided \a rectangle. + + Use boundingRect() combined with QString::left() instead. + + \oldcode + QRect rectangle = boundingRect(rect, flags, text, length); + \newcode + QRect rectangle = boundingRect(rect, flags, text.left(length)); + \endcode +*/ + +/*! + \fn void QPainter::drawText(const QRect &rectangle, int flags, const QString &text, + int length, QRect *br) + \compat + + Use drawText() combined with QString::left() instead. + + \oldcode + QPainter painter(this); + painter.drawText(rectangle, flags, text, length, br ); + \newcode + QPainter painter(this); + painter.drawText(rectangle, flags, text.left(length), br ); + \endcode +*/ + +/*! + \fn QRect QPainter::boundingRect(int x, int y, int width, int height, int flags, + const QString &text, int length); + + \compat + + Returns the bounding rectangle for the given \a length of the \a + text constrained by the rectangle that begins at point (\a{x}, + \a{y}) with the given \a width and \a height. + + Use boundingRect() combined with QString::left() instead. + + \oldcode + QRect rectangle = boundingRect(x, y, width, height, flags, text, length); + \newcode + QRect rectangle = boundingRect(x, y, width, height, flags, text.left(length)); + \endcode +*/ + +/*! + \fn void QPainter::drawText(int x, int y, int width, int height, int flags, + const QString &text, int length, QRect *br) + + \compat + + Use drawText() combined with QString::left() instead. + + \oldcode + QPainter painter(this); + painter.drawText(x, y, width, height, flags, text, length, br ); + \newcode + QPainter painter(this); + painter.drawText(x, y, width, height, flags, text.left(length), br ); + \endcode +*/ + + +/*! + \class QPaintEngineState + \since 4.1 + + \brief The QPaintEngineState class provides information about the + active paint engine's current state. + \reentrant + + QPaintEngineState records which properties that have changed since + the last time the paint engine was updated, as well as their + current value. + + Which properties that have changed can at any time be retrieved + using the state() function. This function returns an instance of + the QPaintEngine::DirtyFlags type which stores an OR combination + of QPaintEngine::DirtyFlag values. The QPaintEngine::DirtyFlag + enum defines whether a property has changed since the last update + or not. + + If a property is marked with a dirty flag, its current value can + be retrieved using the corresponding get function: + + \target GetFunction + + \table + \header \o Property Flag \o Current Property Value + \row \o QPaintEngine::DirtyBackground \o backgroundBrush() + \row \o QPaintEngine::DirtyBackgroundMode \o backgroundMode() + \row \o QPaintEngine::DirtyBrush \o brush() + \row \o QPaintEngine::DirtyBrushOrigin \o brushOrigin() + \row \o QPaintEngine::DirtyClipRegion \e or QPaintEngine::DirtyClipPath + \o clipOperation() + \row \o QPaintEngine::DirtyClipPath \o clipPath() + \row \o QPaintEngine::DirtyClipRegion \o clipRegion() + \row \o QPaintEngine::DirtyCompositionMode \o compositionMode() + \row \o QPaintEngine::DirtyFont \o font() + \row \o QPaintEngine::DirtyTransform \o matrix() + \row \o QPaintEngine::DirtyClipEnabled \o isClipEnabled() + \row \o QPaintEngine::DirtyPen \o pen() + \row \o QPaintEngine::DirtyHints \o renderHints() + \endtable + + The QPaintEngineState class also provide the painter() function + which returns a pointer to the painter that is currently updating + the paint engine. + + An instance of this class, representing the current state of the + active paint engine, is passed as argument to the + QPaintEngine::updateState() function. The only situation in which + you will have to use this class directly is when implementing your + own paint engine. + + \sa QPaintEngine +*/ + + +/*! + \fn QPaintEngine::DirtyFlags QPaintEngineState::state() const + + Returns a combination of flags identifying the set of properties + that need to be updated when updating the paint engine's state + (i.e. during a call to the QPaintEngine::updateState() function). + + \sa QPaintEngine::updateState() +*/ + + +/*! + Returns the pen in the current paint engine state. + + This variable should only be used when the state() returns a + combination which includes the QPaintEngine::DirtyPen flag. + + \sa state(), QPaintEngine::updateState() +*/ + +QPen QPaintEngineState::pen() const +{ + return static_cast<const QPainterState *>(this)->pen; +} + +/*! + Returns the brush in the current paint engine state. + + This variable should only be used when the state() returns a + combination which includes the QPaintEngine::DirtyBrush flag. + + \sa state(), QPaintEngine::updateState() +*/ + +QBrush QPaintEngineState::brush() const +{ + return static_cast<const QPainterState *>(this)->brush; +} + +/*! + Returns the brush origin in the current paint engine state. + + This variable should only be used when the state() returns a + combination which includes the QPaintEngine::DirtyBrushOrigin flag. + + \sa state(), QPaintEngine::updateState() +*/ + +QPointF QPaintEngineState::brushOrigin() const +{ + return static_cast<const QPainterState *>(this)->brushOrigin; +} + +/*! + Returns the background brush in the current paint engine state. + + This variable should only be used when the state() returns a + combination which includes the QPaintEngine::DirtyBackground flag. + + \sa state(), QPaintEngine::updateState() +*/ + +QBrush QPaintEngineState::backgroundBrush() const +{ + return static_cast<const QPainterState *>(this)->bgBrush; +} + +/*! + Returns the background mode in the current paint engine + state. + + This variable should only be used when the state() returns a + combination which includes the QPaintEngine::DirtyBackgroundMode flag. + + \sa state(), QPaintEngine::updateState() +*/ + +Qt::BGMode QPaintEngineState::backgroundMode() const +{ + return static_cast<const QPainterState *>(this)->bgMode; +} + +/*! + Returns the font in the current paint engine + state. + + This variable should only be used when the state() returns a + combination which includes the QPaintEngine::DirtyFont flag. + + \sa state(), QPaintEngine::updateState() +*/ + +QFont QPaintEngineState::font() const +{ + return static_cast<const QPainterState *>(this)->font; +} + +/*! + \since 4.2 + + Returns the matrix in the current paint engine + state. + + This variable should only be used when the state() returns a + combination which includes the QPaintEngine::DirtyTransform flag. + + \sa state(), QPaintEngine::updateState() +*/ + +QMatrix QPaintEngineState::matrix() const +{ + const QPainterState *st = static_cast<const QPainterState *>(this); + + return st->matrix.toAffine(); +} + +/*! + \since 4.3 + + Returns the matrix in the current paint engine state. + + This variable should only be used when the state() returns a + combination which includes the QPaintEngine::DirtyTransform flag. + + \sa state(), QPaintEngine::updateState() +*/ + + +QTransform QPaintEngineState::transform() const +{ + const QPainterState *st = static_cast<const QPainterState *>(this); + + return st->matrix; +} + + +/*! + Returns the clip operation in the current paint engine + state. + + This variable should only be used when the state() returns a + combination which includes either the QPaintEngine::DirtyClipPath + or the QPaintEngine::DirtyClipRegion flag. + + \sa state(), QPaintEngine::updateState() +*/ + +Qt::ClipOperation QPaintEngineState::clipOperation() const +{ + return static_cast<const QPainterState *>(this)->clipOperation; +} + +/*! + \since 4.3 + + Returns whether the coordinate of the fill have been specified + as bounded by the current rendering operation and have to be + resolved (about the currently rendered primitive). +*/ +bool QPaintEngineState::brushNeedsResolving() const +{ + const QBrush &brush = static_cast<const QPainterState *>(this)->brush; + return needsResolving(brush); +} + + +/*! + \since 4.3 + + Returns whether the coordinate of the stroke have been specified + as bounded by the current rendering operation and have to be + resolved (about the currently rendered primitive). +*/ +bool QPaintEngineState::penNeedsResolving() const +{ + const QPen &pen = static_cast<const QPainterState *>(this)->pen; + return needsResolving(pen.brush()); +} + +/*! + Returns the clip region in the current paint engine state. + + This variable should only be used when the state() returns a + combination which includes the QPaintEngine::DirtyClipRegion flag. + + \sa state(), QPaintEngine::updateState() +*/ + +QRegion QPaintEngineState::clipRegion() const +{ + return static_cast<const QPainterState *>(this)->clipRegion; +} + +/*! + Returns the clip path in the current paint engine state. + + This variable should only be used when the state() returns a + combination which includes the QPaintEngine::DirtyClipPath flag. + + \sa state(), QPaintEngine::updateState() +*/ + +QPainterPath QPaintEngineState::clipPath() const +{ + return static_cast<const QPainterState *>(this)->clipPath; +} + +/*! + Returns wether clipping is enabled or not in the current paint + engine state. + + This variable should only be used when the state() returns a + combination which includes the QPaintEngine::DirtyClipEnabled + flag. + + \sa state(), QPaintEngine::updateState() +*/ + +bool QPaintEngineState::isClipEnabled() const +{ + return static_cast<const QPainterState *>(this)->clipEnabled; +} + +/*! + Returns the render hints in the current paint engine state. + + This variable should only be used when the state() returns a + combination which includes the QPaintEngine::DirtyHints + flag. + + \sa state(), QPaintEngine::updateState() +*/ + +QPainter::RenderHints QPaintEngineState::renderHints() const +{ + return static_cast<const QPainterState *>(this)->renderHints; +} + +/*! + Returns the composition mode in the current paint engine state. + + This variable should only be used when the state() returns a + combination which includes the QPaintEngine::DirtyCompositionMode + flag. + + \sa state(), QPaintEngine::updateState() +*/ + +QPainter::CompositionMode QPaintEngineState::compositionMode() const +{ + return static_cast<const QPainterState *>(this)->composition_mode; +} + + +/*! + Returns a pointer to the painter currently updating the paint + engine. +*/ + +QPainter *QPaintEngineState::painter() const +{ + return static_cast<const QPainterState *>(this)->painter; +} + + +/*! + \since 4.2 + + Returns the opacity in the current paint engine state. +*/ + +qreal QPaintEngineState::opacity() const +{ + return static_cast<const QPainterState *>(this)->opacity; +} + +/*! + \since 4.3 + + Sets the world transformation matrix. + If \a combine is true, the specified \a transform is combined with + the current matrix; otherwise it replaces the current matrix. + + This function has been added for compatibility with setMatrix(), + but as with setMatrix() the preferred method of setting a + transformation on the painter is through setWorldTransform(). + + \sa transform() +*/ + +void QPainter::setTransform(const QTransform &transform, bool combine ) +{ + setWorldTransform(transform, combine); +} + +/*! + Returns the world transformation matrix. +*/ + +const QTransform & QPainter::transform() const +{ + return worldTransform(); +} + + +/*! + Returns the matrix that transforms from logical coordinates to + device coordinates of the platform dependent paint device. + + This function is \e only needed when using platform painting + commands on the platform dependent handle (Qt::HANDLE), and the + platform does not do transformations nativly. + + The QPaintEngine::PaintEngineFeature enum can be queried to + determine whether the platform performs the transformations or + not. + + \sa worldTransform(), QPaintEngine::hasFeature(), +*/ + +const QTransform & QPainter::deviceTransform() const +{ + Q_D(const QPainter); + if (!d->engine) { + qWarning("QPainter::deviceTransform: Painter not active"); + return d->fakeState()->transform; + } + return d->state->matrix; +} + + +/*! + Resets any transformations that were made using translate(), + scale(), shear(), rotate(), setWorldTransform(), setViewport() + and setWindow(). + + \sa {Coordinate Transformations} +*/ + +void QPainter::resetTransform() +{ + Q_D(QPainter); +#ifdef QT_DEBUG_DRAW + if (qt_show_painter_debug_output) + printf("QPainter::resetMatrix()\n"); +#endif + if (!d->engine) { + qWarning("QPainter::resetMatrix: Painter not active"); + return; + } + + d->state->wx = d->state->wy = d->state->vx = d->state->vy = 0; // default view origins + d->state->ww = d->state->vw = d->device->metric(QPaintDevice::PdmWidth); + d->state->wh = d->state->vh = d->device->metric(QPaintDevice::PdmHeight); + d->state->worldMatrix = QTransform(); + setMatrixEnabled(false); + setViewTransformEnabled(false); + if (d->extended) + d->extended->transformChanged(); + else + d->state->dirtyFlags |= QPaintEngine::DirtyTransform; +} + +/*! + Sets the world transformation matrix. + If \a combine is true, the specified \a matrix is combined with the current matrix; + otherwise it replaces the current matrix. + + \sa transform(), setTransform() +*/ + +void QPainter::setWorldTransform(const QTransform &matrix, bool combine ) +{ + Q_D(QPainter); + + if (!d->engine) { + qWarning("QPainter::setWorldTransform: Painter not active"); + return; + } + + if (combine) + d->state->worldMatrix = matrix * d->state->worldMatrix; // combines + else + d->state->worldMatrix = matrix; // set new matrix + + d->state->WxF = true; + d->updateMatrix(); +} + +/*! + Returns the world transformation matrix. +*/ + +const QTransform & QPainter::worldTransform() const +{ + Q_D(const QPainter); + if (!d->engine) { + qWarning("QPainter::worldTransform: Painter not active"); + return d->fakeState()->transform; + } + return d->state->worldMatrix; +} + +/*! + Returns the transformation matrix combining the current + window/viewport and world transformation. + + \sa setWorldMatrix(), setWindow(), setViewport() +*/ + +QTransform QPainter::combinedTransform() const +{ + Q_D(const QPainter); + if (!d->engine) { + qWarning("QPainter::combinedTransform: Painter not active"); + return QTransform(); + } + return d->state->worldMatrix * d->viewTransform(); +} + +void qt_draw_helper(QPainterPrivate *p, const QPainterPath &path, QPainterPrivate::DrawOperation operation) +{ + p->draw_helper(path, operation); +} + +QT_END_NAMESPACE |