diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp | 195 | ||||
| -rw-r--r-- | src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h | 26 | ||||
| -rw-r--r-- | src/opengl/gl2paintengineex/qtriangulatingstroker.cpp | 299 | ||||
| -rw-r--r-- | src/opengl/gl2paintengineex/qtriangulatingstroker_p.h | 258 | ||||
| -rw-r--r-- | src/opengl/opengl.pro | 6 |
5 files changed, 730 insertions, 54 deletions
diff --git a/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp b/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp index 13efbda..bcc6bdb 100644 --- a/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp +++ b/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp @@ -81,6 +81,8 @@ #include "qglengineshadermanager_p.h" #include "qgl2pexvertexarray_p.h" +#include "qtriangulatingstroker_p.h" + #include <QDebug> QT_BEGIN_NAMESPACE @@ -572,7 +574,6 @@ void QGL2PaintEngineExPrivate::updateMatrix() // // We expand out the multiplication to save the cost of a full 4x4 // matrix multiplication as most of the components are trivial. - const QTransform& transform = q->state()->matrix; if (mode == TextDrawingMode) { @@ -628,6 +629,9 @@ void QGL2PaintEngineExPrivate::updateMatrix() // The actual data has been updated so both shader program's uniforms need updating simpleShaderMatrixUniformDirty = true; shaderMatrixUniformDirty = true; + + dasher.setInvScale(inverseScale); + stroker.setInvScale(inverseScale); } @@ -838,28 +842,6 @@ void QGL2PaintEngineExPrivate::transferMode(EngineMode newMode) mode = newMode; } -void QGL2PaintEngineExPrivate::drawOutline(const QVectorPath& path) -{ - transferMode(BrushDrawingMode); - - // Might need to call updateMatrix to re-calculate inverseScale - if (matrixDirty) - updateMatrix(); - - vertexCoordinateArray.clear(); - vertexCoordinateArray.addPath(path, inverseScale); - - if (path.hasImplicitClose()) { - // Close the path's outline - vertexCoordinateArray.lineToArray(path.points()[0], path.points()[1]); - vertexCoordinateArray.stops().last() += 1; - } - - prepareForDraw(currentBrush->isOpaque()); - drawVertexArrays(vertexCoordinateArray, GL_LINE_STRIP); -} - - // Assumes everything is configured for the brush you want to use void QGL2PaintEngineExPrivate::fill(const QVectorPath& path) { @@ -922,8 +904,14 @@ void QGL2PaintEngineExPrivate::fill(const QVectorPath& path) } -void QGL2PaintEngineExPrivate::fillStencilWithVertexArray(QGL2PEXVertexArray& vertexArray, bool useWindingFill) +void QGL2PaintEngineExPrivate::fillStencilWithVertexArray(const float *data, + int count, + const QVector<int> *stops, + const QGLRect &bounds, + StencilFillMode mode) { + Q_ASSERT(count || stops); + // qDebug("QGL2PaintEngineExPrivate::fillStencilWithVertexArray()"); glStencilMask(0xff); // Enable stencil writes @@ -955,19 +943,20 @@ void QGL2PaintEngineExPrivate::fillStencilWithVertexArray(QGL2PEXVertexArray& ve } #endif - if (useWindingFill) { + if (mode == WindingFillMode) { + Q_ASSERT(stops && !count); if (q->state()->clipTestEnabled) { // Flatten clip values higher than current clip, and set high bit to match current clip glStencilFunc(GL_LEQUAL, GL_STENCIL_HIGH_BIT | q->state()->currentClip, ~GL_STENCIL_HIGH_BIT); glStencilOp(GL_KEEP, GL_REPLACE, GL_REPLACE); - composite(vertexArray.boundingRect()); + composite(bounds); glStencilFunc(GL_EQUAL, GL_STENCIL_HIGH_BIT, GL_STENCIL_HIGH_BIT); } else if (!stencilClean) { // Clear stencil buffer within bounding rect glStencilFunc(GL_ALWAYS, 0, 0xff); glStencilOp(GL_ZERO, GL_ZERO, GL_ZERO); - composite(vertexArray.boundingRect()); + composite(bounds); } // Inc. for front-facing triangle @@ -975,19 +964,43 @@ void QGL2PaintEngineExPrivate::fillStencilWithVertexArray(QGL2PEXVertexArray& ve // Dec. for back-facing "holes" glStencilOpSeparate(GL_BACK, GL_KEEP, GL_DECR_WRAP, GL_DECR_WRAP); glStencilMask(~GL_STENCIL_HIGH_BIT); - drawVertexArrays(vertexArray, GL_TRIANGLE_FAN); + drawVertexArrays(data, stops, GL_TRIANGLE_FAN); if (q->state()->clipTestEnabled) { // Clear high bit of stencil outside of path glStencilFunc(GL_EQUAL, q->state()->currentClip, ~GL_STENCIL_HIGH_BIT); glStencilOp(GL_KEEP, GL_REPLACE, GL_REPLACE); glStencilMask(GL_STENCIL_HIGH_BIT); - composite(vertexArray.boundingRect()); + composite(bounds); } - } else { + } else if (mode == OddEvenFillMode) { + glStencilMask(GL_STENCIL_HIGH_BIT); + glStencilOp(GL_KEEP, GL_KEEP, GL_INVERT); // Simply invert the stencil bit + drawVertexArrays(data, stops, GL_TRIANGLE_FAN); + + } else { // TriStripStrokeFillMode + Q_ASSERT(count && !stops); // tristrips generated directly, so no vertexArray or stops glStencilMask(GL_STENCIL_HIGH_BIT); +#if 0 glStencilOp(GL_KEEP, GL_KEEP, GL_INVERT); // Simply invert the stencil bit - drawVertexArrays(vertexArray, GL_TRIANGLE_FAN); + glEnableVertexAttribArray(QT_VERTEX_COORDS_ATTR); + glVertexAttribPointer(QT_VERTEX_COORDS_ATTR, 2, GL_FLOAT, GL_FALSE, 0, data); + glDrawArrays(GL_TRIANGLE_STRIP, 0, count); + glDisableVertexAttribArray(QT_VERTEX_COORDS_ATTR); +#else + + glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE); + if (q->state()->clipTestEnabled) { + glStencilFunc(GL_LEQUAL, q->state()->currentClip | GL_STENCIL_HIGH_BIT, + ~GL_STENCIL_HIGH_BIT); + } else { + glStencilFunc(GL_ALWAYS, GL_STENCIL_HIGH_BIT, 0xff); + } + glEnableVertexAttribArray(QT_VERTEX_COORDS_ATTR); + glVertexAttribPointer(QT_VERTEX_COORDS_ATTR, 2, GL_FLOAT, GL_FALSE, 0, data); + glDrawArrays(GL_TRIANGLE_STRIP, 0, count); + glDisableVertexAttribArray(QT_VERTEX_COORDS_ATTR); +#endif } // Enable color writes & disable stencil writes @@ -1122,14 +1135,15 @@ void QGL2PaintEngineExPrivate::composite(const QGLRect& boundingRect) } // Draws the vertex array as a set of <vertexArrayStops.size()> triangle fans. -void QGL2PaintEngineExPrivate::drawVertexArrays(QGL2PEXVertexArray& vertexArray, GLenum primitive) +void QGL2PaintEngineExPrivate::drawVertexArrays(const float *data, const QVector<int> *stops, + GLenum primitive) { // Now setup the pointer to the vertex array: glEnableVertexAttribArray(QT_VERTEX_COORDS_ATTR); - glVertexAttribPointer(QT_VERTEX_COORDS_ATTR, 2, GL_FLOAT, GL_FALSE, 0, vertexArray.data()); + glVertexAttribPointer(QT_VERTEX_COORDS_ATTR, 2, GL_FLOAT, GL_FALSE, 0, data); int previousStop = 0; - foreach(int stop, vertexArray.stops()) { + foreach(int stop, *stops) { /* qDebug("Drawing triangle fan for vertecies %d -> %d:", previousStop, stop-1); for (int i=previousStop; i<stop; ++i) @@ -1180,12 +1194,29 @@ void QGL2PaintEngineEx::fill(const QVectorPath &path, const QBrush &brush) { Q_D(QGL2PaintEngineEx); - if (qbrush_style(brush) == Qt::NoBrush) + Qt::BrushStyle style = qbrush_style(brush); + if (style == Qt::NoBrush) return; if (!d->inRenderText) ensureActive(); + + QOpenGL2PaintEngineState *s = state(); + bool doOffset = !(s->renderHints & QPainter::Antialiasing) && style == Qt::SolidPattern; + + if (doOffset) { + d->temporaryTransform = s->matrix; + QTransform tx = QTransform::fromTranslate(.49, .49); + s->matrix = s->matrix * tx; + d->matrixDirty = true; + } + d->setBrush(&brush); d->fill(path); + + if (doOffset) { + s->matrix = d->temporaryTransform; + d->matrixDirty = true; + } } void QGL2PaintEngineEx::stroke(const QVectorPath &path, const QPen &pen) @@ -1197,23 +1228,89 @@ void QGL2PaintEngineEx::stroke(const QVectorPath &path, const QPen &pen) if (penStyle == Qt::NoPen || qbrush_style(penBrush) == Qt::NoBrush) return; + QOpenGL2PaintEngineState *s = state(); + ensureActive(); - qreal penWidth = qpen_widthf(pen); - if ( (pen.isCosmetic() && (penStyle == Qt::SolidLine)) && (penWidth < 2.5f) ) - { - // We only handle solid, cosmetic pens with a width of 1 pixel - const QBrush& brush = pen.brush(); - d->setBrush(&brush); + bool doOffset = !(s->renderHints & QPainter::Antialiasing); + if (doOffset) { + d->temporaryTransform = s->matrix; + QTransform tx = QTransform::fromTranslate(0.49, .49); + s->matrix = s->matrix * tx; + d->matrixDirty = true; + } - if (penWidth < 0.01f) - glLineWidth(1.0); - else - glLineWidth(penWidth); + bool opaque = penBrush.isOpaque() && s->opacity > 0.99; + d->setBrush(&penBrush); + d->transferMode(BrushDrawingMode); + + // updateMatrix() is responsible for setting the inverse scale on + // the strokers, so we need to call it here and not wait for + // prepareForDraw() down below. + d->updateMatrix(); + + if (penStyle == Qt::SolidLine) { + d->stroker.process(path, pen); + + } else { // Some sort of dash + d->dasher.process(path, pen); + + QVectorPath dashStroke(d->dasher.points(), + d->dasher.elementCount(), + d->dasher.elementTypes()); + d->stroker.process(dashStroke, pen); + } + + + QGLContext *ctx = d->ctx; + + if (opaque) { + d->prepareForDraw(opaque); + glEnableVertexAttribArray(QT_VERTEX_COORDS_ATTR); + glVertexAttribPointer(QT_VERTEX_COORDS_ATTR, 2, GL_FLOAT, false, 0, d->stroker.vertices()); + glDrawArrays(GL_TRIANGLE_STRIP, 0, d->stroker.vertexCount() / 2); + +// QBrush b(Qt::green); +// d->setBrush(&b); +// d->prepareForDraw(true); +// glDrawArrays(GL_LINE_STRIP, 0, d->stroker.vertexCount() / 2); - d->drawOutline(path); - } else - return QPaintEngineEx::stroke(path, pen); + glDisableVertexAttribArray(QT_VERTEX_COORDS_ATTR); + + } else { + qreal width = qpen_widthf(pen) / 2; + if (width == 0) + width = 0.5; + qreal extra = pen.joinStyle() == Qt::MiterJoin + ? qMax(pen.miterLimit() * width, width) + : width; + + if (pen.isCosmetic()) + extra = extra * d->inverseScale; + + QRectF bounds = path.controlPointRect().adjusted(-extra, -extra, extra, extra); + + d->fillStencilWithVertexArray(d->stroker.vertices(), d->stroker.vertexCount() / 2, + 0, bounds, QGL2PaintEngineExPrivate::TriStripStrokeFillMode); + + glStencilOp(GL_KEEP, GL_REPLACE, GL_REPLACE); + + // Pass when any bit is set, replace stencil value with 0 + glStencilFunc(GL_NOTEQUAL, 0, GL_STENCIL_HIGH_BIT); + d->prepareForDraw(false); + + // Stencil the brush onto the dest buffer + d->composite(bounds); + + glStencilMask(0); + + d->updateClipScissorTest(); + } + + if (doOffset) { + s->matrix = d->temporaryTransform; + d->matrixDirty = true; + } } void QGL2PaintEngineEx::penChanged() { } @@ -1542,7 +1639,7 @@ void QGL2PaintEngineEx::drawPixmaps(const QDrawPixmaps::Data *drawingData, int d s = qFastSin(drawingData[i].rotation * Q_PI / 180); c = qFastCos(drawingData[i].rotation * Q_PI / 180); } - + qreal right = 0.5 * drawingData[i].scaleX * drawingData[i].source.width(); qreal bottom = 0.5 * drawingData[i].scaleY * drawingData[i].source.height(); QGLPoint bottomRight(right * c - bottom * s, right * s + bottom * c); diff --git a/src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h b/src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h index 5704a04..209cd36 100644 --- a/src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h +++ b/src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h @@ -62,6 +62,7 @@ #include <private/qglpixmapfilter_p.h> #include <private/qfontengine_p.h> #include <private/qdatabuffer_p.h> +#include <private/qtriangulatingstroker_p.h> enum EngineMode { ImageDrawingMode, @@ -160,6 +161,12 @@ class QGL2PaintEngineExPrivate : public QPaintEngineExPrivate { Q_DECLARE_PUBLIC(QGL2PaintEngineEx) public: + enum StencilFillMode { + OddEvenFillMode, + WindingFillMode, + TriStripStrokeFillMode + }; + QGL2PaintEngineExPrivate(QGL2PaintEngineEx *q_ptr) : q(q_ptr), width(0), height(0), @@ -185,15 +192,24 @@ public: // fill, drawOutline, drawTexture & drawCachedGlyphs are the rendering entry points: void fill(const QVectorPath &path); - void drawOutline(const QVectorPath& path); void drawTexture(const QGLRect& dest, const QGLRect& src, const QSize &textureSize, bool opaque, bool pattern = false); void drawCachedGlyphs(const QPointF &p, QFontEngineGlyphCache::Type glyphType, const QTextItemInt &ti); - void drawVertexArrays(QGL2PEXVertexArray& vertexArray, GLenum primitive); + void drawVertexArrays(const float *data, const QVector<int> *stops, GLenum primitive); + void drawVertexArrays(QGL2PEXVertexArray &vertexArray, GLenum primitive) { + drawVertexArrays((const float *) vertexArray.data(), &vertexArray.stops(), primitive); + } + // ^ draws whatever is in the vertex array void composite(const QGLRect& boundingRect); // ^ Composites the bounding rect onto dest buffer - void fillStencilWithVertexArray(QGL2PEXVertexArray& vertexArray, bool useWindingFill); + + void fillStencilWithVertexArray(const float *data, int count, const QVector<int> *stops, const QGLRect &bounds, StencilFillMode mode); + void fillStencilWithVertexArray(QGL2PEXVertexArray& vertexArray, bool useWindingFill) { + fillStencilWithVertexArray((const float *) vertexArray.data(), 0, &vertexArray.stops(), + vertexArray.boundingRect(), + useWindingFill ? WindingFillMode : OddEvenFillMode); + } // ^ Calls drawVertexArrays to render into stencil buffer bool prepareForDraw(bool srcPixelsAreOpaque); @@ -266,6 +282,10 @@ public: float textureInvertedY; + QTriangulatingStroker stroker; + QDashedStrokeProcessor dasher; + QTransform temporaryTransform; + QScopedPointer<QPixmapFilter> convolutionFilter; QScopedPointer<QPixmapFilter> colorizeFilter; QScopedPointer<QPixmapFilter> blurFilter; diff --git a/src/opengl/gl2paintengineex/qtriangulatingstroker.cpp b/src/opengl/gl2paintengineex/qtriangulatingstroker.cpp new file mode 100644 index 0000000..250dab6 --- /dev/null +++ b/src/opengl/gl2paintengineex/qtriangulatingstroker.cpp @@ -0,0 +1,299 @@ +#include "qtriangulatingstroker_p.h" +#include <qmath.h> + + +#define CURVE_FLATNESS Q_PI / 8 + + + + +void QTriangulatingStroker::endCapOrJoinClosed(const qreal *start, const qreal *cur, + bool implicitClose, bool endsAtStart) +{ + if (endsAtStart) { + join(start + 2); + } else if (implicitClose) { + join(start); + lineTo(start); + join(start+2); + } else { + endCap(cur); + } +} + + +void QTriangulatingStroker::process(const QVectorPath &path, const QPen &pen) +{ + const qreal *pts = path.points(); + const QPainterPath::ElementType *types = path.elements(); + int count = path.elementCount(); + if (count < 2) + return; + + float realWidth = qpen_widthf(pen); + if (realWidth == 0) + realWidth = 1; + + m_width = realWidth / 2; + + bool cosmetic = pen.isCosmetic(); + if (cosmetic) { + m_width = m_width * m_inv_scale; + } + + m_join_style = qpen_joinStyle(pen); + m_cap_style = qpen_capStyle(pen); + m_vertices.reset(); + m_miter_limit = pen.miterLimit() * qpen_widthf(pen); + + // The curvyness is based on the notion that I originally wanted + // roughly one line segment pr 4 pixels. This may seem little, but + // because we sample at constantly incrementing B(t) E [0<t<1], we + // will get longer segments where the curvature is small and smaller + // segments when the curvature is high. + // + // To get a rough idea of the length of each curve, I pretend that + // the curve is a 90 degree arc, whose radius is + // qMax(curveBounds.width, curveBounds.height). Based on this + // logic we can estimate the length of the outline edges based on + // the radius + a pen width and adjusting for scale factors + // depending on if the pen is cosmetic or not. + // + // The curvyness value of PI/14 was based on, + // arcLength=2*PI*r/4=PI/2 and splitting length into somewhere + // between 3 and 8 where 5 seemed to be give pretty good results + // hence: Q_PI/14. Lower divisors will give more detail at the + // direct cost of performance. + + // simplfy pens that are thin in device size (2px wide or less) + if (realWidth < 2.5 && (cosmetic || m_inv_scale == 1)) { + if (m_cap_style == Qt::RoundCap) + m_cap_style = Qt::SquareCap; + if (m_join_style == Qt::RoundJoin) + m_join_style = Qt::MiterJoin; + m_curvyness_add = 0.5; + m_curvyness_mul = CURVE_FLATNESS; + m_roundness = 1; + } else if (cosmetic) { + m_curvyness_add = realWidth / 2; + m_curvyness_mul = CURVE_FLATNESS; + m_roundness = qMax<int>(4, realWidth * CURVE_FLATNESS); + } else { + m_curvyness_add = m_width; + m_curvyness_mul = CURVE_FLATNESS / m_inv_scale; + m_roundness = qMax<int>(4, realWidth * m_curvyness_mul); + } + + // Over this level of segmentation, there doesn't seem to be any + // benefit, even for huge penWidth + if (m_roundness > 24) + m_roundness = 24; + + m_sin_theta = qSin(Q_PI / m_roundness); // ### Use qFastSin + m_cos_theta = qCos(Q_PI / m_roundness); + + const qreal *endPts = pts + (count<<1); + const qreal *startPts; + + Qt::PenCapStyle cap = m_cap_style; + + if (!types) { + startPts = pts; + + bool endsAtStart = startPts[0] == *(endPts-2) && startPts[1] == *(endPts-1); + + Qt::PenCapStyle cap = m_cap_style; + if (endsAtStart || path.hasImplicitClose()) + m_cap_style = Qt::FlatCap; + moveTo(pts); + m_cap_style = cap; + pts += 2; + lineTo(pts); + pts += 2; + while (pts < endPts) { + join(pts); + lineTo(pts); + pts += 2; + } + + endCapOrJoinClosed(startPts, pts-2, path.hasImplicitClose(), endsAtStart); + + } else { + bool endsAtStart; + while (pts < endPts) { + switch (*types) { + case QPainterPath::MoveToElement: { + if (pts != path.points()) + endCapOrJoinClosed(startPts, pts, path.hasImplicitClose(), endsAtStart); + + startPts = pts; + int end = (endPts - pts) / 2; + int i = 2; // Start looking to ahead since we never have two moveto's in a row + while (i<end && types[i] != QPainterPath::MoveToElement) { + ++i; + } + endsAtStart = startPts[0] == pts[i*2 - 2] && startPts[1] == pts[i*2 - 1]; + if (endsAtStart || path.hasImplicitClose()) + m_cap_style = Qt::FlatCap; + + moveTo(pts); + m_cap_style = cap; + pts+=2; + ++types; + break; } + case QPainterPath::LineToElement: + if (*(types - 1) != QPainterPath::MoveToElement) + join(pts); + lineTo(pts); + pts+=2; + ++types; + break; + case QPainterPath::CurveToElement: + if (*(types - 1) != QPainterPath::MoveToElement) + join(pts); + cubicTo(pts); + pts+=6; + types+=3; + break; + default: + Q_ASSERT(false); + break; + } + } + + endCapOrJoinClosed(startPts, pts-2, path.hasImplicitClose(), endsAtStart); + } +} + +void QTriangulatingStroker::cubicTo(const qreal *pts) +{ + const QPointF *p = (const QPointF *) pts; + QBezier bezier = QBezier::fromPoints(*(p - 1), p[0], p[1], p[2]); + + QRectF bounds = bezier.bounds(); + float rad = qMax(bounds.width(), bounds.height()); + int threshold = qMin<float>(64, (rad + m_curvyness_add) * m_curvyness_mul); + if (threshold < 4) + threshold = 4; + qreal threshold_minus_1 = threshold - 1; + float vx, vy; + + float cx = m_cx, cy = m_cy; + float x, y; + + for (int i=1; i<threshold; ++i) { + qreal t = qreal(i) / threshold_minus_1; + QPointF p = bezier.pointAt(t); + x = p.x(); + y = p.y(); + + normalVector(cx, cy, x, y, &vx, &vy); + + emitLineSegment(x, y, vx, vy); + + cx = x; + cy = y; + } + + m_cx = cx; + m_cy = cy; + + m_nvx = vx; + m_nvy = vy; +} + + + +static void qdashprocessor_moveTo(qreal x, qreal y, void *data) +{ + ((QDashedStrokeProcessor *) data)->addElement(QPainterPath::MoveToElement, x, y); +} + +static void qdashprocessor_lineTo(qreal x, qreal y, void *data) +{ + ((QDashedStrokeProcessor *) data)->addElement(QPainterPath::LineToElement, x, y); +} + +static void qdashprocessor_cubicTo(qreal, qreal, qreal, qreal, qreal, qreal, void *) +{ + Q_ASSERT(0); // The dasher should not produce curves... +} + +QDashedStrokeProcessor::QDashedStrokeProcessor() + : m_dash_stroker(0), m_inv_scale(1) +{ + m_dash_stroker.setMoveToHook(qdashprocessor_moveTo); + m_dash_stroker.setLineToHook(qdashprocessor_lineTo); + m_dash_stroker.setCubicToHook(qdashprocessor_cubicTo); +} + +void QDashedStrokeProcessor::process(const QVectorPath &path, const QPen &pen) +{ + + const qreal *pts = path.points(); + const QPainterPath::ElementType *types = path.elements(); + int count = path.elementCount(); + + m_points.reset(); + m_types.reset(); + + qreal width = pen.width(); + if (width == 0) + width = 1; + + m_dash_stroker.setDashPattern(pen.dashPattern()); + m_dash_stroker.setStrokeWidth(width); + m_dash_stroker.setMiterLimit(pen.miterLimit()); + qreal curvyness = sqrt(width) * m_inv_scale / 8; + + if (count < 2) + return; + + const qreal *endPts = pts + (count<<1); + + m_dash_stroker.begin(this); + + if (!types) { + m_dash_stroker.moveTo(pts[0], pts[1]); + pts += 2; + while (pts < endPts) { + m_dash_stroker.lineTo(pts[0], pts[1]); + pts += 2; + } + } else { + while (pts < endPts) { + switch (*types) { + case QPainterPath::MoveToElement: + m_dash_stroker.moveTo(pts[0], pts[1]); + pts += 2; + ++types; + break; + case QPainterPath::LineToElement: + m_dash_stroker.lineTo(pts[0], pts[1]); + pts += 2; + ++types; + break; + case QPainterPath::CurveToElement: { + QBezier b = QBezier::fromPoints(*(((const QPointF *) pts) - 1), + *(((const QPointF *) pts)), + *(((const QPointF *) pts) + 1), + *(((const QPointF *) pts) + 2)); + QRectF bounds = b.bounds(); + int threshold = qMin<float>(64, qMax(bounds.width(), bounds.height()) * curvyness); + if (threshold < 4) + threshold = 4; + qreal threshold_minus_1 = threshold - 1; + for (int i=0; i<threshold; ++i) { + QPointF pt = b.pointAt(i / threshold_minus_1); + m_dash_stroker.lineTo(pt.x(), pt.y()); + } + pts += 6; + types += 3; + break; } + default: break; + } + } + } + + m_dash_stroker.end(); +} diff --git a/src/opengl/gl2paintengineex/qtriangulatingstroker_p.h b/src/opengl/gl2paintengineex/qtriangulatingstroker_p.h new file mode 100644 index 0000000..a28fc45 --- /dev/null +++ b/src/opengl/gl2paintengineex/qtriangulatingstroker_p.h @@ -0,0 +1,258 @@ +#ifndef QTRIANGULATINGSTROKER_P_H +#define QTRIANGULATINGSTROKER_P_H + +#include <private/qdatabuffer_p.h> +#include <private/qvectorpath_p.h> +#include <private/qbezier_p.h> +#include <private/qnumeric_p.h> +#include <private/qmath_p.h> + + +class QTriangulatingStroker +{ +public: + void process(const QVectorPath &path, const QPen &pen); + + inline int vertexCount() const { return m_vertices.size(); } + inline const float *vertices() const { return m_vertices.data(); } + + inline void setInvScale(qreal invScale) { m_inv_scale = invScale; } + +private: + inline void emitLineSegment(float x, float y, float nx, float ny); + inline void moveTo(const qreal *pts); + inline void lineTo(const qreal *pts); + void cubicTo(const qreal *pts); + inline void join(const qreal *pts); + inline void normalVector(float x1, float y1, float x2, float y2, float *nx, float *ny); + inline void endCap(const qreal *pts); + inline void arc(float x, float y); + void endCapOrJoinClosed(const qreal *start, const qreal *cur, bool implicitClose, bool endsAtStart); + + + QDataBuffer<float> m_vertices; + + float m_cx, m_cy; // current points + float m_nvx, m_nvy; // normal vector... + float m_width; + qreal m_miter_limit; + + int m_roundness; // Number of line segments in a round join + qreal m_sin_theta; // sin(m_roundness / 360); + qreal m_cos_theta; // cos(m_roundness / 360); + qreal m_inv_scale; + float m_curvyness_mul; + float m_curvyness_add; + + Qt::PenJoinStyle m_join_style; + Qt::PenCapStyle m_cap_style; +}; + +class QDashedStrokeProcessor +{ +public: + QDashedStrokeProcessor(); + + void process(const QVectorPath &path, const QPen &pen); + + inline void addElement(QPainterPath::ElementType type, qreal x, qreal y) { + m_points.add(x); + m_points.add(y); + m_types.add(type); + } + + inline int elementCount() const { return m_types.size(); } + inline qreal *points() const { return m_points.data(); } + inline QPainterPath::ElementType *elementTypes() const { return m_types.data(); } + + inline void setInvScale(qreal invScale) { m_inv_scale = invScale; } + +private: + QDataBuffer<qreal> m_points; + QDataBuffer<QPainterPath::ElementType> m_types; + QDashStroker m_dash_stroker; + qreal m_inv_scale; +}; + + + + + +inline void QTriangulatingStroker::normalVector(float x1, float y1, float x2, float y2, + float *nx, float *ny) +{ + float dx = x2 - x1; + float dy = y2 - y1; + float pw = m_width / sqrt(dx*dx + dy*dy); + *nx = -dy * pw; + *ny = dx * pw; +} + + + +inline void QTriangulatingStroker::emitLineSegment(float x, float y, float vx, float vy) +{ + m_vertices.add(x + vx); + m_vertices.add(y + vy); + m_vertices.add(x - vx); + m_vertices.add(y - vy); +} + + + +// We draw a full circle for any round join or round cap which is a +// bit of overkill... +inline void QTriangulatingStroker::arc(float x, float y) +{ + float dx = m_width; + float dy = 0; + for (int i=0; i<=m_roundness; ++i) { + float tmpx = dx * m_cos_theta - dy * m_sin_theta; + float tmpy = dx * m_sin_theta + dy * m_cos_theta; + dx = tmpx; + dy = tmpy; + emitLineSegment(x, y, dx, dy); + } +} + + + +inline void QTriangulatingStroker::endCap(const qreal *pts) +{ + switch (m_cap_style) { + case Qt::FlatCap: + break; + case Qt::SquareCap: { + float dx = m_cx - *(pts - 2); + float dy = m_cy - *(pts - 1); + + float len = m_width / sqrt(dx * dx + dy * dy); + dx = dx * len; + dy = dy * len; + + emitLineSegment(m_cx + dx, m_cy + dy, m_nvx, m_nvy); + break; } + case Qt::RoundCap: + arc(m_cx, m_cy); + break; + default: break; // to shut gcc up... + } + + int count = m_vertices.size(); + m_vertices.add(m_vertices.at(count-2)); + m_vertices.add(m_vertices.at(count-1)); +} + + +void QTriangulatingStroker::moveTo(const qreal *pts) +{ + m_cx = pts[0]; + m_cy = pts[1]; + + float x2 = pts[2]; + float y2 = pts[3]; + normalVector(m_cx, m_cy, x2, y2, &m_nvx, &m_nvy); + + + // To acheive jumps we insert zero-area tringles. This is done by + // adding two identical points in both the end of previous strip + // and beginning of next strip + bool invisibleJump = m_vertices.size(); + + switch (m_cap_style) { + case Qt::FlatCap: + if (invisibleJump) { + m_vertices.add(m_cx + m_nvx); + m_vertices.add(m_cy + m_nvy); + } + break; + case Qt::SquareCap: { + float dx = x2 - m_cx; + float dy = y2 - m_cy; + float len = m_width / sqrt(dx * dx + dy * dy); + dx = dx * len; + dy = dy * len; + float sx = m_cx - dx; + float sy = m_cy - dy; + if (invisibleJump) { + m_vertices.add(sx + m_nvx); + m_vertices.add(sy + m_nvy); + } + emitLineSegment(sx, sy, m_nvx, m_nvy); + break; } + case Qt::RoundCap: + if (invisibleJump) { + m_vertices.add(m_cx + m_nvx); + m_vertices.add(m_cy + m_nvy); + } + + // This emitLineSegment is not needed for the arc, but we need + // to start where we put the invisibleJump vertex, otherwise + // we'll have visible triangles between subpaths. + emitLineSegment(m_cx, m_cy, m_nvx, m_nvy); + arc(m_cx, m_cy); + break; + default: break; // ssssh gcc... + } + emitLineSegment(m_cx, m_cy, m_nvx, m_nvy); +} + + + +void QTriangulatingStroker::lineTo(const qreal *pts) +{ + emitLineSegment(pts[0], pts[1], m_nvx, m_nvy); + m_cx = pts[0]; + m_cy = pts[1]; +} + + + + + +void QTriangulatingStroker::join(const qreal *pts) +{ + // Creates a join to the next segment (m_cx, m_cy) -> (pts[0], pts[1]) + normalVector(m_cx, m_cy, pts[0], pts[1], &m_nvx, &m_nvy); + + switch (m_join_style) { + case Qt::BevelJoin: + break; + case Qt::MiterJoin: { + int p1 = m_vertices.size() - 6; + int p2 = m_vertices.size() - 2; + QLineF line(m_vertices.at(p1), m_vertices.at(p1+1), + m_vertices.at(p2), m_vertices.at(p2+1)); + QLineF nextLine(m_cx - m_nvx, m_cy - m_nvy, + pts[0] - m_nvx, pts[1] - m_nvy); + + QPointF isect; + if (line.intersect(nextLine, &isect) != QLineF::NoIntersection + && QLineF(line.p2(), isect).length() <= m_miter_limit) { + // The intersection point mirrored over the m_cx, m_cy point + m_vertices.add(m_cx - (isect.x() - m_cx)); + m_vertices.add(m_cy - (isect.y() - m_cy)); + + // The intersection point + m_vertices.add(isect.x()); + m_vertices.add(isect.y()); + } + // else + // Do a plain bevel join if the miter limit is exceeded or if + // the lines are parallel. This is not what the raster + // engine's stroker does, but it is both faster and similar to + // what some other graphics API's do. + + break; } + case Qt::RoundJoin: + arc(m_cx, m_cy); + break; + + default: break; // gcc warn-- + } + + emitLineSegment(m_cx, m_cy, m_nvx, m_nvy); +} + + +#endif diff --git a/src/opengl/opengl.pro b/src/opengl/opengl.pro index e561932..058016e 100644 --- a/src/opengl/opengl.pro +++ b/src/opengl/opengl.pro @@ -60,7 +60,8 @@ SOURCES += qgl.cpp \ gl2paintengineex/qgl2pexvertexarray_p.h \ gl2paintengineex/qpaintengineex_opengl2_p.h \ gl2paintengineex/qglengineshadersource_p.h \ - gl2paintengineex/qglcustomshaderstage_p.h + gl2paintengineex/qglcustomshaderstage_p.h \ + gl2paintengineex/qtriangulatingstroker_p.h SOURCES += qglshaderprogram.cpp \ qglpixmapfilter.cpp \ @@ -72,7 +73,8 @@ SOURCES += qgl.cpp \ gl2paintengineex/qglengineshadermanager.cpp \ gl2paintengineex/qgl2pexvertexarray.cpp \ gl2paintengineex/qpaintengineex_opengl2.cpp \ - gl2paintengineex/qglcustomshaderstage.cpp + gl2paintengineex/qglcustomshaderstage.cpp \ + gl2paintengineex/qtriangulatingstroker.cpp } |