mirror of https://github.com/JakubMelka/PDF4QT.git
Issue #123: Clipping
This commit is contained in:
Jakub Melka
parent
f80b7b059e
commit
7ad04b55ee
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@ -84,12 +84,27 @@ private:
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/// Returns composition operator
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static BLCompOp getBLCompOp(QPainter::CompositionMode mode);
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void drawPathImpl(const QPainterPath& path, bool enableStroke, bool enableFill);
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void setFillRule(Qt::FillRule fillRule);
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void updateFont(QFont newFont);
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void setPathFillMode(PolygonDrawMode mode, QPainterPath& path);
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void updateClipping(std::optional<QRegion> clipRegion,
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std::optional<QPainterPath> clipPath,
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Qt::ClipOperation clipOperation);
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bool isStrokeActive() const { return m_currentPen.style() != Qt::NoPen; }
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bool isFillActive() const { return m_currentBrush.style() != Qt::NoBrush; }
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enum class ClipMode
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{
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NoClip,
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NotVisible,
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NeedsResolve
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};
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ClipMode resolveClipping(const QPainterPath& path) const;
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QImage& m_qtOffscreenBuffer;
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std::optional<BLContext> m_blContext;
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std::optional<BLImage> m_blOffscreenBuffer;
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@ -99,6 +114,13 @@ private:
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QBrush m_currentBrush;
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QFont m_currentFont;
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QRawFont m_currentRawFont;
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QTransform m_currentTransform;
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bool m_currentIsClipEnabled = false;
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bool m_clipSingleRect = false;
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std::optional<QRegion> m_clipRegion;
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std::optional<QPainterPath> m_clipPath;
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std::optional<QPainterPath> m_finalClipPath;
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};
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PDFBLPaintDevice::PDFBLPaintDevice(QImage& offscreenBuffer, bool isMultithreaded) :
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@ -247,9 +269,7 @@ void PDFBLPaintEngine::updateState(const QPaintEngineState& updatedState)
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DirtyBackground = 0x0010,
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DirtyBackgroundMode = 0x0020,
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DirtyClipRegion = 0x0080,
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DirtyClipPath = 0x0100,
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DirtyHints = 0x0200,
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DirtyClipEnabled = 0x0800,*/
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DirtyClipPath = 0x0100,*/
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if (updatedState.state().testFlag(QPaintEngine::DirtyPen))
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{
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@ -275,6 +295,7 @@ void PDFBLPaintEngine::updateState(const QPaintEngineState& updatedState)
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if (updatedState.state().testFlag(QPaintEngine::DirtyTransform))
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{
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m_currentTransform = updatedState.transform();
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m_blContext->setMatrix(getBLMatrix(updatedState.transform()));
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}
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@ -282,6 +303,34 @@ void PDFBLPaintEngine::updateState(const QPaintEngineState& updatedState)
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{
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updateFont(updatedState.font());
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}
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if (updatedState.state().testFlag(QPaintEngine::DirtyClipEnabled))
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{
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m_currentIsClipEnabled = updatedState.isClipEnabled();
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}
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if (updatedState.state().testFlag(QPaintEngine::DirtyHints))
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{
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// Do nothing
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}
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if (updatedState.state().testAnyFlags(QPaintEngine::DirtyClipPath | QPaintEngine::DirtyClipRegion))
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{
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std::optional<QRegion> clipRegion;
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std::optional<QPainterPath> clipPath;
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if (updatedState.state().testFlag(QPaintEngine::DirtyClipRegion))
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{
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clipRegion = updatedState.clipRegion();
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}
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if (updatedState.state().testFlag(QPaintEngine::DirtyClipPath))
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{
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clipPath = updatedState.clipPath();
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}
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updateClipping(std::move(clipRegion), std::move(clipPath), updatedState.clipOperation());
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}
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}
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void PDFBLPaintEngine::drawRects(const QRect* rects, int rectCount)
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@ -356,70 +405,52 @@ void PDFBLPaintEngine::drawLines(const QLineF* lines, int lineCount)
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void PDFBLPaintEngine::drawEllipse(const QRectF& r)
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{
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QPointF c = r.center();
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BLEllipse blEllipse(c.x(), c.y(), r.width() * 0.5, r.height() * 0.5);
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if (isFillActive())
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{
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m_blContext->fillEllipse(blEllipse);
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}
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if (isStrokeActive())
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{
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m_blContext->strokeEllipse(blEllipse);
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}
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QPainterPath path;
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path.addEllipse(r);
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drawPathImpl(path, true, true);
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}
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void PDFBLPaintEngine::drawEllipse(const QRect& r)
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{
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QPointF c = r.center();
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BLEllipse blEllipse(c.x(), c.y(), r.width() * 0.5, r.height() * 0.5);
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if (isFillActive())
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{
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m_blContext->fillEllipse(blEllipse);
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}
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if (isStrokeActive())
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{
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m_blContext->strokeEllipse(blEllipse);
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}
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}
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void PDFBLPaintEngine::setFillRule(Qt::FillRule fillRule)
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{
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BLFillRule blFillRule{};
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switch (fillRule)
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{
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case Qt::OddEvenFill:
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blFillRule = BL_FILL_RULE_EVEN_ODD;
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break;
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case Qt::WindingFill:
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blFillRule = BL_FILL_RULE_NON_ZERO;
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break;
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default:
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Q_ASSERT(false);
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break;
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}
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m_blContext->setFillRule(blFillRule);
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QPainterPath path;
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path.addEllipse(r);
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drawPathImpl(path, true, true);
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}
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void PDFBLPaintEngine::drawPath(const QPainterPath& path)
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{
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drawPathImpl(path, true, true);
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}
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void PDFBLPaintEngine::drawPathImpl(const QPainterPath& path, bool enableStroke, bool enableFill)
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{
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QPainterPath transformedPath = m_currentTransform.map(path);
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ClipMode clipMode = resolveClipping(transformedPath);
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switch (clipMode)
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{
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case ClipMode::NoClip:
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// Do as normal
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break;
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case pdf::PDFBLPaintEngine::ClipMode::NotVisible:
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// Graphics is not visible
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return;
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case pdf::PDFBLPaintEngine::ClipMode::NeedsResolve:
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break;
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}
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BLPath blPath = getBLPath(path);
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setFillRule(path.fillRule());
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if (isFillActive())
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if (isFillActive() && enableFill)
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{
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m_blContext->fillPath(blPath);
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}
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if (isStrokeActive())
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if (isStrokeActive() && enableStroke)
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{
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m_blContext->strokePath(blPath);
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}
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@ -462,34 +493,9 @@ void PDFBLPaintEngine::drawPolygon(const QPointF* points, int pointCount, Polygo
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polygon.assign(points, points + pointCount);
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path.addPolygon(polygon);
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switch (mode)
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{
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case QPaintEngine::OddEvenMode:
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path.setFillRule(Qt::OddEvenFill);
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break;
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case QPaintEngine::WindingMode:
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path.setFillRule(Qt::WindingFill);
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break;
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case QPaintEngine::ConvexMode:
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path.setFillRule(Qt::OddEvenFill);
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break;
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case QPaintEngine::PolylineMode:
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path.setFillRule(Qt::OddEvenFill);
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break;
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}
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setPathFillMode(mode, path);
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setFillRule(path.fillRule());
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BLPath blPath = getBLPath(path);
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if (isFillActive() && mode != QPaintEngine::PolylineMode)
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{
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m_blContext->fillPath(blPath);
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}
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if (isStrokeActive())
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{
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m_blContext->strokePath(blPath);
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}
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drawPathImpl(path, true, mode != QPaintEngine::PolylineMode);
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}
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void PDFBLPaintEngine::drawPolygon(const QPoint* points, int pointCount, PolygonDrawMode mode)
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@ -499,34 +505,9 @@ void PDFBLPaintEngine::drawPolygon(const QPoint* points, int pointCount, Polygon
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polygon.assign(points, points + pointCount);
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path.addPolygon(polygon);
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switch (mode)
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{
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case QPaintEngine::OddEvenMode:
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path.setFillRule(Qt::OddEvenFill);
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break;
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case QPaintEngine::WindingMode:
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path.setFillRule(Qt::WindingFill);
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break;
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case QPaintEngine::ConvexMode:
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path.setFillRule(Qt::OddEvenFill);
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break;
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case QPaintEngine::PolylineMode:
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path.setFillRule(Qt::OddEvenFill);
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break;
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}
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setPathFillMode(mode, path);
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setFillRule(path.fillRule());
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BLPath blPath = getBLPath(path);
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if (isFillActive() && mode != QPaintEngine::PolylineMode)
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{
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m_blContext->fillPath(blPath);
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}
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if (isStrokeActive())
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{
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m_blContext->strokePath(blPath);
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}
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drawPathImpl(path, true, mode != QPaintEngine::PolylineMode);
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}
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void PDFBLPaintEngine::drawPixmap(const QRectF& r, const QPixmap& pm, const QRectF& sr)
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@ -932,4 +913,157 @@ BLCompOp PDFBLPaintEngine::getBLCompOp(QPainter::CompositionMode mode)
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return BL_COMP_OP_SRC_OVER;
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}
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void PDFBLPaintEngine::setPathFillMode(PolygonDrawMode mode, QPainterPath& path)
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{
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switch (mode)
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{
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case QPaintEngine::OddEvenMode:
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path.setFillRule(Qt::OddEvenFill);
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break;
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case QPaintEngine::WindingMode:
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path.setFillRule(Qt::WindingFill);
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break;
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case QPaintEngine::ConvexMode:
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path.setFillRule(Qt::OddEvenFill);
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break;
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case QPaintEngine::PolylineMode:
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path.setFillRule(Qt::OddEvenFill);
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break;
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}
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}
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void PDFBLPaintEngine::updateClipping(std::optional<QRegion> clipRegion,
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std::optional<QPainterPath> clipPath,
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Qt::ClipOperation clipOperation)
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{
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switch (clipOperation)
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{
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case Qt::NoClip:
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m_clipRegion.reset();
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m_clipPath.reset();
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m_finalClipPath.reset();
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m_clipSingleRect = false;
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m_blContext->restoreClipping();
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return;
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case Qt::ReplaceClip:
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{
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m_clipPath = std::move(clipPath);
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m_clipRegion = std::move(clipRegion);
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break;
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}
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case Qt::IntersectClip:
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{
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if (m_clipPath.has_value())
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{
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if (clipPath.has_value())
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{
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*m_clipPath = m_clipPath->intersected(*clipPath);
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}
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}
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else
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{
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m_clipPath = std::move(clipPath);
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}
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if (m_clipRegion.has_value())
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{
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if (clipRegion.has_value())
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{
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*m_clipRegion = m_clipRegion->intersected(*clipRegion);
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}
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}
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else
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{
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m_clipRegion = std::move(clipRegion);
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}
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break;
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}
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}
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m_clipSingleRect = m_clipRegion.has_value() && !m_clipPath.has_value() && m_clipRegion->rectCount() == 1;
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if (m_clipSingleRect)
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{
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QRegion transformedRegion = m_currentTransform.map(m_clipRegion.value());
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m_blContext->clipToRect(getBLRect(transformedRegion.boundingRect()));
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}
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else
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{
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m_blContext->restoreClipping();
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}
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m_finalClipPath = QPainterPath();
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QPainterPath clip1;
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QPainterPath clip2;
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if (m_clipPath.has_value())
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{
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clip1 = m_clipPath.value();
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}
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if (m_clipRegion.has_value())
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{
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clip2.addRegion(m_clipRegion.value());
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}
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if (!clip1.isEmpty() && !clip2.isEmpty())
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{
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m_finalClipPath = clip1.intersected(clip2);
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}
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else if (!clip1.isEmpty())
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{
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m_finalClipPath = std::move(clip1);
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}
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else if (!clip2.isEmpty())
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{
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m_finalClipPath = std::move(clip2);
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}
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m_finalClipPath = m_currentTransform.map(m_finalClipPath.value());
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}
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PDFBLPaintEngine::ClipMode PDFBLPaintEngine::resolveClipping(const QPainterPath& path) const
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{
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if (!m_currentIsClipEnabled || m_clipSingleRect || !m_finalClipPath.has_value() || m_finalClipPath->isEmpty())
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{
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return ClipMode::NoClip;
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}
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QRectF clipRect = m_finalClipPath->controlPointRect();
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QRectF pathRect = path.controlPointRect();
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if (!pathRect.intersects(clipRect))
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{
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return ClipMode::NotVisible;
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}
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return ClipMode::NeedsResolve;
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}
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void PDFBLPaintEngine::setFillRule(Qt::FillRule fillRule)
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{
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BLFillRule blFillRule{};
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switch (fillRule)
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{
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case Qt::OddEvenFill:
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blFillRule = BL_FILL_RULE_EVEN_ODD;
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break;
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case Qt::WindingFill:
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blFillRule = BL_FILL_RULE_NON_ZERO;
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break;
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default:
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Q_ASSERT(false);
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break;
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}
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m_blContext->setFillRule(blFillRule);
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}
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} // namespace pdf
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