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Transparency groups

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Jakub Melka
2019-09-29 18:09:09 +02:00
parent c1dfe0280c
commit 024c613171
4 changed files with 212 additions and 14 deletions
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22
PdfForQtLib/sources/pdfpainter.h
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@@ -30,6 +30,8 @@ namespace pdf
/// Processor, which processes PDF's page commands on the QPainter. It works with QPainter
/// and with transformation matrix, which translates page points to the device points.
/// Only basic transparency is supported, advanced transparency, such as transparency groups,
/// are not supported. Painter will try to emulate them so painting will not fail completely.
class PDFPainter : public PDFPageContentProcessor
{
public:
@@ -60,6 +62,8 @@ protected:
virtual void performUpdateGraphicsState(const PDFPageContentProcessorState& state) override;
virtual void performSaveGraphicState(ProcessOrder order) override;
virtual void performRestoreGraphicState(ProcessOrder order) override;
virtual void performBeginTransparencyGroup(ProcessOrder order, const PDFTransparencyGroup& transparencyGroup);
virtual void performEndTransparencyGroup(ProcessOrder order, const PDFTransparencyGroup& transparencyGroup);
virtual bool isContentSuppressedByOC(PDFObjectReference ocgOrOcmd) override;
private:
@@ -75,10 +79,28 @@ private:
/// Returns current brush (implementation)
QBrush getCurrentBrushImpl() const;
/// Returns effective stroking alpha from transparency groups and current graphic state
PDFReal getEffectiveStrokingAlpha() const;
/// Returns effective filling alpha from transparency groups and current graphic state
PDFReal getEffectiveFillingAlpha() const;
/// Returns true, if blend mode can be set according the transparency group stack
bool canSetBlendMode(BlendMode mode) const;
struct PDFTransparencyGroupPainterData
{
PDFTransparencyGroup group;
PDFReal alphaStroke = 1.0;
PDFReal alphaFill = 1.0;
BlendMode blendMode = BlendMode::Normal;
};
QPainter* m_painter;
PDFRenderer::Features m_features;
PDFCachedItem<QPen> m_currentPen;
PDFCachedItem<QBrush> m_currentBrush;
std::vector<PDFTransparencyGroupPainterData> m_transparencyGroupDataStack;
};
} // namespace pdf