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Transparency groups

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This commit is contained in:
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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104
PdfForQtLib/sources/pdfpainter.cpp
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@ -154,7 +154,7 @@ void PDFPainter::performMeshPainting(const PDFMesh& mesh)
{
m_painter->save();
m_painter->setWorldMatrix(QMatrix());
mesh.paint(m_painter, getGraphicState()->getAlphaFilling());
mesh.paint(m_painter, getEffectiveFillingAlpha());
m_painter->restore();
}
@ -188,15 +188,26 @@ void PDFPainter::performUpdateGraphicsState(const PDFPageContentProcessorState&
// If current blend mode has changed, then update it
if (flags.testFlag(PDFPageContentProcessorState::StateBlendMode))
{
// Try to simulate transparency groups. Use only first composition mode,
// outside the transparency groups (so we are on pages main transparency
// groups).
const BlendMode blendMode = state.getBlendMode();
const QPainter::CompositionMode compositionMode = PDFBlendModeInfo::getCompositionModeFromBlendMode(blendMode);
if (!PDFBlendModeInfo::isSupportedByQt(blendMode))
if (canSetBlendMode(blendMode))
{
reportRenderError(RenderErrorType::NotImplemented, PDFTranslationContext::tr("Blend mode '%1' not supported.").arg(PDFBlendModeInfo::getBlendModeName(blendMode)));
}
const QPainter::CompositionMode compositionMode = PDFBlendModeInfo::getCompositionModeFromBlendMode(blendMode);
m_painter->setCompositionMode(compositionMode);
if (!PDFBlendModeInfo::isSupportedByQt(blendMode))
{
reportRenderError(RenderErrorType::NotSupported, PDFTranslationContext::tr("Blend mode '%1' not supported.").arg(PDFBlendModeInfo::getBlendModeName(blendMode)));
}
m_painter->setCompositionMode(compositionMode);
}
else if (blendMode != BlendMode::Normal && blendMode != BlendMode::Compatible)
{
reportRenderError(RenderErrorType::NotSupported, PDFTranslationContext::tr("Blend mode '%1' is in transparency group, which is not supported.").arg(PDFBlendModeInfo::getBlendModeName(blendMode)));
}
}
PDFPageContentProcessor::performUpdateGraphicsState(state);
@ -218,6 +229,29 @@ void PDFPainter::performRestoreGraphicState(ProcessOrder order)
}
}
void PDFPainter::performBeginTransparencyGroup(ProcessOrder order, const PDFTransparencyGroup& transparencyGroup)
{
if (order == ProcessOrder::BeforeOperation)
{
PDFTransparencyGroupPainterData data;
data.group = transparencyGroup;
data.alphaFill = getGraphicState()->getAlphaFilling();
data.alphaStroke = getGraphicState()->getAlphaStroking();
data.blendMode = getGraphicState()->getBlendMode();
m_transparencyGroupDataStack.emplace_back(qMove(data));
}
}
void PDFPainter::performEndTransparencyGroup(PDFPageContentProcessor::ProcessOrder order, const PDFPageContentProcessor::PDFTransparencyGroup& transparencyGroup)
{
Q_UNUSED(transparencyGroup);
if (order == ProcessOrder::AfterOperation)
{
m_transparencyGroupDataStack.pop_back();
}
}
bool PDFPainter::isContentSuppressedByOC(PDFObjectReference ocgOrOcmd)
{
if (m_features.testFlag(PDFRenderer::IgnoreOptionalContent))
@ -231,9 +265,10 @@ bool PDFPainter::isContentSuppressedByOC(PDFObjectReference ocgOrOcmd)
QPen PDFPainter::getCurrentPenImpl() const
{
const PDFPageContentProcessorState* graphicState = getGraphicState();
const QColor& color = graphicState->getStrokeColorWithAlpha();
QColor color = graphicState->getStrokeColor();
if (color.isValid())
{
color.setAlphaF(getEffectiveStrokingAlpha());
const PDFReal lineWidth = graphicState->getLineWidth();
Qt::PenCapStyle penCapStyle = graphicState->getLineCapStyle();
Qt::PenJoinStyle penJoinStyle = graphicState->getLineJoinStyle();
@ -269,9 +304,10 @@ QPen PDFPainter::getCurrentPenImpl() const
QBrush PDFPainter::getCurrentBrushImpl() const
{
const PDFPageContentProcessorState* graphicState = getGraphicState();
const QColor& color = graphicState->getFillColorWithAlpha();
QColor color = graphicState->getFillColor();
if (color.isValid())
{
color.setAlphaF(getEffectiveFillingAlpha());
return QBrush(color, Qt::SolidPattern);
}
else
@ -280,4 +316,54 @@ QBrush PDFPainter::getCurrentBrushImpl() const
}
}
PDFReal PDFPainter::getEffectiveStrokingAlpha() const
{
PDFReal alpha = getGraphicState()->getAlphaStroking();
auto it = m_transparencyGroupDataStack.crbegin();
auto itEnd = m_transparencyGroupDataStack.crend();
for (; it != itEnd; ++it)
{
const PDFTransparencyGroupPainterData& transparencyGroup = *it;
alpha *= transparencyGroup.alphaStroke;
if (transparencyGroup.group.isolated)
{
break;
}
}
return alpha;
}
PDFReal PDFPainter::getEffectiveFillingAlpha() const
{
PDFReal alpha = getGraphicState()->getAlphaFilling();
auto it = m_transparencyGroupDataStack.crbegin();
auto itEnd = m_transparencyGroupDataStack.crend();
for (; it != itEnd; ++it)
{
const PDFTransparencyGroupPainterData& transparencyGroup = *it;
alpha *= transparencyGroup.alphaFill;
if (transparencyGroup.group.isolated)
{
break;
}
}
return alpha;
}
bool PDFPainter::canSetBlendMode(BlendMode mode) const
{
// We will assume, that we can set blend mode, when
// all other blend modes on transparency stack are normal,
// or compatible. It should work.
Q_UNUSED(mode);
return std::all_of(m_transparencyGroupDataStack.cbegin(), m_transparencyGroupDataStack.cend(), [](const PDFTransparencyGroupPainterData& group) { return group.blendMode == BlendMode::Normal || group.blendMode == BlendMode::Compatible; });
}
} // namespace pdf