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Diffstat (limited to 'src/declarative/graphicsitems/qdeclarativetextlayout.cpp')
| -rw-r--r-- | src/declarative/graphicsitems/qdeclarativetextlayout.cpp | 358 |
1 files changed, 358 insertions, 0 deletions
diff --git a/src/declarative/graphicsitems/qdeclarativetextlayout.cpp b/src/declarative/graphicsitems/qdeclarativetextlayout.cpp new file mode 100644 index 0000000..e8b5fb2 --- /dev/null +++ b/src/declarative/graphicsitems/qdeclarativetextlayout.cpp @@ -0,0 +1,358 @@ +/**************************************************************************** +** +** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtDeclarative 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 Technology Preview License Agreement accompanying +** this package. +** +** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qdeclarativetextlayout_p.h" +#include <private/qstatictext_p.h> +#include <private/qfontengine_p.h> +#include <private/qtextengine_p.h> +#include <private/qpainter_p.h> +#include <private/qpaintengineex_p.h> + +QT_BEGIN_NAMESPACE + +class QDeclarativeTextLayoutPrivate +{ +public: + QDeclarativeTextLayoutPrivate() + : cached(false) {} + + QPointF position; + + bool cached; + QVector<QStaticTextItem> items; + QVector<QFixedPoint> positions; + QVector<glyph_t> glyphs; + QVector<QChar> chars; +}; + +Q_GUI_EXPORT extern int qt_defaultDpiX(); +Q_GUI_EXPORT extern int qt_defaultDpiY(); + +namespace { +class DrawTextItemRecorder: public QPaintEngine +{ + public: + DrawTextItemRecorder(bool untransformedCoordinates, bool useBackendOptimizations) + : m_inertText(0), m_dirtyPen(false), m_useBackendOptimizations(useBackendOptimizations), + m_untransformedCoordinates(untransformedCoordinates) + { + } + + virtual void updateState(const QPaintEngineState &newState) + { + if (newState.state() & QPaintEngine::DirtyPen) + m_dirtyPen = true; + } + + virtual void drawTextItem(const QPointF &position, const QTextItem &textItem) + { + int glyphOffset = m_inertText->glyphs.size(); // Store offset into glyph pool + int positionOffset = m_inertText->glyphs.size(); // Offset into position pool + int charOffset = m_inertText->chars.size(); + + const QTextItemInt &ti = static_cast<const QTextItemInt &>(textItem); + + bool needFreshCurrentItem = true; + if (!m_inertText->items.isEmpty()) { + QStaticTextItem &last = m_inertText->items[m_inertText->items.count() - 1]; + + if (last.fontEngine == ti.fontEngine && last.font == ti.font() && + (!m_dirtyPen || last.color == state->pen().color())) { + needFreshCurrentItem = false; + + last.numChars += ti.num_chars; + last.numGlyphs += ti.glyphs.numGlyphs; + + } + } + + if (needFreshCurrentItem) { + QStaticTextItem currentItem; + + currentItem.fontEngine = ti.fontEngine; + currentItem.font = ti.font(); + currentItem.charOffset = charOffset; + currentItem.numChars = ti.num_chars; + currentItem.numGlyphs = ti.glyphs.numGlyphs; + currentItem.glyphOffset = glyphOffset; + currentItem.positionOffset = positionOffset; + currentItem.useBackendOptimizations = m_useBackendOptimizations; + if (m_dirtyPen) + currentItem.color = state->pen().color(); + + m_inertText->items.append(currentItem); + } + + QTransform matrix = m_untransformedCoordinates ? QTransform() : state->transform(); + matrix.translate(position.x(), position.y()); + + QVarLengthArray<glyph_t> glyphs; + QVarLengthArray<QFixedPoint> positions; + ti.fontEngine->getGlyphPositions(ti.glyphs, matrix, ti.flags, glyphs, positions); + + int size = glyphs.size(); + Q_ASSERT(size == ti.glyphs.numGlyphs); + Q_ASSERT(size == positions.size()); + + m_inertText->glyphs.resize(m_inertText->glyphs.size() + size); + m_inertText->positions.resize(m_inertText->glyphs.size()); + m_inertText->chars.resize(m_inertText->chars.size() + ti.num_chars); + + glyph_t *glyphsDestination = m_inertText->glyphs.data() + glyphOffset; + qMemCopy(glyphsDestination, glyphs.constData(), sizeof(glyph_t) * ti.glyphs.numGlyphs); + + QFixedPoint *positionsDestination = m_inertText->positions.data() + positionOffset; + qMemCopy(positionsDestination, positions.constData(), sizeof(QFixedPoint) * ti.glyphs.numGlyphs); + + QChar *charsDestination = m_inertText->chars.data() + charOffset; + qMemCopy(charsDestination, ti.chars, sizeof(QChar) * ti.num_chars); + + } + + virtual void drawPolygon(const QPointF *, int , PolygonDrawMode ) + { + /* intentionally empty */ + } + + virtual bool begin(QPaintDevice *) { return true; } + virtual bool end() { return true; } + virtual void drawPixmap(const QRectF &, const QPixmap &, const QRectF &) {} + virtual Type type() const + { + return User; + } + + void begin(QDeclarativeTextLayoutPrivate *t) { + m_inertText = t; + m_dirtyPen = false; + } + + private: + QDeclarativeTextLayoutPrivate *m_inertText; + + bool m_dirtyPen; + bool m_useBackendOptimizations; + bool m_untransformedCoordinates; +}; + +class DrawTextItemDevice: public QPaintDevice +{ + public: + DrawTextItemDevice(bool untransformedCoordinates, bool useBackendOptimizations) + { + m_paintEngine = new DrawTextItemRecorder(untransformedCoordinates, + useBackendOptimizations); + } + + ~DrawTextItemDevice() + { + delete m_paintEngine; + } + + void begin(QDeclarativeTextLayoutPrivate *t) { + m_paintEngine->begin(t); + } + + int metric(PaintDeviceMetric m) const + { + int val; + switch (m) { + case PdmWidth: + case PdmHeight: + case PdmWidthMM: + case PdmHeightMM: + val = 0; + break; + case PdmDpiX: + case PdmPhysicalDpiX: + val = qt_defaultDpiX(); + break; + case PdmDpiY: + case PdmPhysicalDpiY: + val = qt_defaultDpiY(); + break; + case PdmNumColors: + val = 16777216; + break; + case PdmDepth: + val = 24; + break; + default: + val = 0; + qWarning("DrawTextItemDevice::metric: Invalid metric command"); + } + return val; + } + + virtual QPaintEngine *paintEngine() const + { + return m_paintEngine; + } + + private: + DrawTextItemRecorder *m_paintEngine; +}; + +struct InertTextPainter { + InertTextPainter() + : device(true, true), painter(&device) {} + + DrawTextItemDevice device; + QPainter painter; +}; +} + +Q_GLOBAL_STATIC(InertTextPainter, inertTextPainter); + +/*! +\class QDeclarativeTextLayout +\brief The QDeclarativeTextLayout class is a version of QStaticText that works with QTextLayouts. +\internal + +This class is basically a copy of the QStaticText code, but it is adapted to source its text from +QTextLayout. + +It is also considerably faster to create a QDeclarativeTextLayout than a QStaticText because it uses +a single, shared QPainter instance. QStaticText by comparison creates a new QPainter per instance. +As a consequence this means that QDeclarativeTextLayout is not re-enterant. Adding a lock around +the shared painter solves this, and only introduces a minor performance penalty, but is unnecessary +for QDeclarativeTextLayout's current use (QDeclarativeText is already tied to the GUI thread). +*/ + +QDeclarativeTextLayout::QDeclarativeTextLayout() +: d(0) +{ +} + +QDeclarativeTextLayout::QDeclarativeTextLayout(const QString &text) +: QTextLayout(text), d(0) +{ +} + +QDeclarativeTextLayout::~QDeclarativeTextLayout() +{ + if (d) delete d; +} + +void QDeclarativeTextLayout::beginLayout() +{ + if (d && d->cached) { + d->cached = false; + d->items.clear(); + d->positions.clear(); + d->glyphs.clear(); + d->chars.clear(); + d->position = QPointF(); + } + QTextLayout::beginLayout(); +} + +void QDeclarativeTextLayout::prepare() +{ + if (!d || !d->cached) { + + if (!d) + d = new QDeclarativeTextLayoutPrivate; + + InertTextPainter *itp = inertTextPainter(); + itp->device.begin(d); + QTextLayout::draw(&itp->painter, QPointF(0, 0)); + + glyph_t *glyphPool = d->glyphs.data(); + QFixedPoint *positionPool = d->positions.data(); + QChar *charPool = d->chars.data(); + + int itemCount = d->items.count(); + for (int ii = 0; ii < itemCount; ++ii) { + QStaticTextItem &item = d->items[ii]; + item.glyphs = glyphPool + item.glyphOffset; + item.glyphPositions = positionPool + item.positionOffset; + item.chars = charPool + item.charOffset; + } + + d->cached = true; + } +} + +void QDeclarativeTextLayout::draw(QPainter *painter, const QPointF &p) +{ + QPainterPrivate *priv = QPainterPrivate::get(painter); + + bool paintEngineSupportsTransformations = priv->extended && + (priv->extended->type() == QPaintEngine::OpenGL2 || + priv->extended->type() == QPaintEngine::OpenVG || + priv->extended->type() == QPaintEngine::OpenGL); + + if (!paintEngineSupportsTransformations) { + QTextLayout::draw(painter, p); + return; + } + + prepare(); + + int itemCount = d->items.count(); + + if (p != d->position) { + QFixed fx = QFixed::fromReal(p.x()); + QFixed fy = QFixed::fromReal(p.y()); + QFixed oldX = QFixed::fromReal(d->position.x()); + QFixed oldY = QFixed::fromReal(d->position.y()); + for (int item = 0; item < itemCount; ++item) { + QStaticTextItem &textItem = d->items[item]; + + for (int ii = 0; ii < textItem.numGlyphs; ++ii) { + textItem.glyphPositions[ii].x += fx - oldX; + textItem.glyphPositions[ii].y += fy - oldY; + } + textItem.userDataNeedsUpdate = true; + } + + d->position = p; + } + + for (int ii = 0; ii < itemCount; ++ii) { + QStaticTextItem &item = d->items[ii]; + priv->extended->drawStaticTextItem(&item); + } +} + +QT_END_NAMESPACE + |