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Soft mask - finishing

This commit is contained in:
Jakub Melka 2021-03-25 17:24:31 +01:00
parent 2e9459dfa9
commit 1b801a2b2a
2 changed files with 59 additions and 4 deletions
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56
Pdf4QtLib/sources/pdftransparencyrenderer.cpp
View File

@ -1122,6 +1122,31 @@ QImage PDFTransparencyRenderer::toImage(bool use16Bit, bool usePaper, const PDFR
return image;
}
void PDFTransparencyRenderer::clearColor(const PDFColor& color)
{
PDFFloatBitmapWithColorSpace* backdrop = getImmediateBackdrop();
const PDFPixelFormat pixelFormat = backdrop->getPixelFormat();
const uint8_t processColorChannelStart = pixelFormat.getProcessColorChannelIndexStart();
const uint8_t processColorChannelEnd = pixelFormat.getProcessColorChannelIndexEnd();
for (uint8_t i = processColorChannelStart; i < processColorChannelEnd; ++i)
{
if (i >= color.size())
{
reportRenderError(RenderErrorType::Error, PDFTranslationContext::tr("Invalid clear color - process color %1 was not found in clear color.").arg(i));
return;
}
backdrop->fillChannel(i, color[i]);
}
if (color.size() > pixelFormat.getProcessColorChannelCount())
{
reportRenderError(RenderErrorType::Error, PDFTranslationContext::tr("More colors in clear color (%1) than process color channel count (%2).").arg(color.size()).arg(pixelFormat.getProcessColorChannelCount()));
}
}
void PDFTransparencyRenderer::performPixelSampling(const PDFReal shape,
const PDFReal opacity,
const uint8_t shapeChannel,
@ -1886,7 +1911,7 @@ void PDFTransparencyRenderer::processSoftMask(const PDFDictionary* softMask)
}
if (!blendColorSpace->isBlendColorSpace())
{
reportRenderError(RenderErrorType::Error, PDFTranslationContext::tr("Invalind blend color space of soft mask definition."));
reportRenderError(RenderErrorType::Error, PDFTranslationContext::tr("Invalid blend color space of soft mask definition."));
getPainterState()->softMask.makeOpaque();
return;
}
@ -1898,11 +1923,11 @@ void PDFTransparencyRenderer::processSoftMask(const PDFDictionary* softMask)
PDFPageContentProcessorState graphicState = *getGraphicState();
graphicState.setSoftMask(nullptr);
// TODO: soft mask background color
softMaskRenderer.setDeviceColorSpace(blendColorSpace);
softMaskRenderer.setProcessColorSpace(blendColorSpace);
softMaskRenderer.beginPaint(QSize(int(m_drawBuffer.getWidth()), int(m_drawBuffer.getHeight())));
softMaskRenderer.clearColor(softMaskDefinition.getBackdropColor());
softMaskRenderer.setGraphicsState(graphicState);
softMaskRenderer.processForm(softMaskDefinition.getFormStream());
const PDFFloatBitmap& renderedSoftMask = softMaskRenderer.endPaint();
@ -1925,9 +1950,32 @@ void PDFTransparencyRenderer::processSoftMask(const PDFDictionary* softMask)
break;
}
getPainterState()->softMask = PDFTransparencySoftMask(false, qMove(softMask));
if (const PDFFunction* function = softMaskDefinition.getTransferFunction())
{
const size_t width = softMask.getWidth();
const size_t height = softMask.getHeight();
// TODO: use transfer function
for (size_t y = 0; y < height; ++y)
{
for (size_t x = 0; x < width; ++x)
{
PDFColorBuffer pixel = softMask.getPixel(x, y);
PDFReal sourceValue = pixel[0];
PDFReal targetValue = sourceValue;
PDFFunction::FunctionResult result = function->apply(&sourceValue, &sourceValue + 1, &targetValue, &targetValue + 1);
if (!result)
{
reportRenderErrorOnce(RenderErrorType::Error, PDFTranslationContext::tr("Evaulation of soft mask transfer function failed."));
}
pixel[0] = targetValue;
}
}
}
getPainterState()->softMask = PDFTransparencySoftMask(false, qMove(softMask));
}
}

7
Pdf4QtLib/sources/pdftransparencyrenderer.h
View File

@ -644,6 +644,13 @@ public:
/// \param paperColor Paper color
QImage toImage(bool use16Bit, bool usePaper, const PDFRGB& paperColor) const;
/// Clear color buffer with given color (this affects all process colors). If a number
/// of process colors are different from a number of colors in color, then error is triggered,
/// and most min(process color count, colors in color) process color channels are filled
/// with color.
/// \param color Color
void clearColor(const PDFColor& color);
virtual void performPathPainting(const QPainterPath& path, bool stroke, bool fill, bool text, Qt::FillRule fillRule) override;
virtual bool performPathPaintingUsingShading(const QPainterPath& path, bool stroke, bool fill, const PDFShadingPattern* shadingPattern) override;
virtual void performFinishPathPainting() override;