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Blending output with paper

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Jakub Melka
2021-02-11 19:42:55 +01:00
parent e743761ce4
commit 3da8cf2252
3 changed files with 92 additions and 59 deletions
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134
Pdf4QtLib/sources/pdftransparencyrenderer.cpp
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@ -650,7 +650,75 @@ const PDFFloatBitmap& PDFTransparencyRenderer::endPaint()
return *getImmediateBackdrop();
}
QImage PDFTransparencyRenderer::toImage(bool use16Bit) const
QImage PDFTransparencyRenderer::toImageImpl(const PDFFloatBitmapWithColorSpace& floatImage, bool use16Bit) const
{
QImage image;
Q_ASSERT(floatImage.getPixelFormat().getProcessColorChannelCount() == 3);
if (use16Bit)
{
image = QImage(int(floatImage.getWidth()), int(floatImage.getHeight()), QImage::Format_RGBA64);
const PDFPixelFormat pixelFormat = floatImage.getPixelFormat();
const int height = image.height();
const int width = image.width();
const float scale = std::numeric_limits<quint16>::max();
const uint8_t channelStart = pixelFormat.getProcessColorChannelIndexStart();
const uint8_t channelEnd = pixelFormat.getProcessColorChannelIndexEnd();
const uint8_t opacityChannel = pixelFormat.getOpacityChannelIndex();
for (int y = 0; y < height; ++y)
{
quint16* pixels = reinterpret_cast<quint16*>(image.bits() + y * image.bytesPerLine());
for (int x = 0; x < width; ++x)
{
PDFConstColorBuffer colorBuffer = floatImage.getPixel(x, y);
for (uint8_t channel = channelStart; channel < channelEnd; ++channel)
{
*pixels++ = quint16(colorBuffer[channel] * scale);
}
*pixels++ = quint16(colorBuffer[opacityChannel] * scale);
}
}
}
else
{
image = QImage(int(floatImage.getWidth()), int(floatImage.getHeight()), QImage::Format_RGBA8888);
const PDFPixelFormat pixelFormat = floatImage.getPixelFormat();
const int height = image.height();
const int width = image.width();
const float scale = std::numeric_limits<quint8>::max();
const uint8_t channelStart = pixelFormat.getProcessColorChannelIndexStart();
const uint8_t channelEnd = pixelFormat.getProcessColorChannelIndexEnd();
const uint8_t opacityChannel = pixelFormat.getOpacityChannelIndex();
for (int y = 0; y < height; ++y)
{
quint8* pixels = reinterpret_cast<quint8*>(image.bits() + y * image.bytesPerLine());
for (int x = 0; x < width; ++x)
{
PDFConstColorBuffer colorBuffer = floatImage.getPixel(x, y);
for (uint8_t channel = channelStart; channel < channelEnd; ++channel)
{
*pixels++ = quint8(colorBuffer[channel] * scale);
}
*pixels++ = quint8(colorBuffer[opacityChannel] * scale);
}
}
}
return image;
}
QImage PDFTransparencyRenderer::toImage(bool use16Bit, bool usePaper, PDFRGB paperColor) const
{
QImage image;
@ -660,64 +728,24 @@ QImage PDFTransparencyRenderer::toImage(bool use16Bit) const
const PDFFloatBitmapWithColorSpace& floatImage = m_transparencyGroupDataStack.back().immediateBackdrop;
Q_ASSERT(floatImage.getPixelFormat().hasOpacityChannel());
if (use16Bit)
if (!usePaper)
{
image = QImage(int(floatImage.getWidth()), int(floatImage.getHeight()), QImage::Format_RGBA64);
const PDFPixelFormat pixelFormat = floatImage.getPixelFormat();
const int height = image.height();
const int width = image.width();
const float scale = std::numeric_limits<quint16>::max();
const uint8_t channelStart = pixelFormat.getProcessColorChannelIndexStart();
const uint8_t channelEnd = pixelFormat.getProcessColorChannelIndexEnd();
const uint8_t opacityChannel = pixelFormat.getOpacityChannelIndex();
for (int y = 0; y < height; ++y)
{
quint16* pixels = reinterpret_cast<quint16*>(image.bits() + y * image.bytesPerLine());
for (int x = 0; x < width; ++x)
{
PDFConstColorBuffer colorBuffer = floatImage.getPixel(x, y);
for (uint8_t channel = channelStart; channel < channelEnd; ++channel)
{
*pixels++ = quint16(colorBuffer[channel] * scale);
}
*pixels++ = quint16(colorBuffer[opacityChannel] * scale);
}
}
return toImageImpl(floatImage, use16Bit);
}
else
{
image = QImage(int(floatImage.getWidth()), int(floatImage.getHeight()), QImage::Format_RGBA8888);
const PDFPixelFormat pixelFormat = floatImage.getPixelFormat();
const int height = image.height();
const int width = image.width();
const float scale = std::numeric_limits<quint8>::max();
const uint8_t channelStart = pixelFormat.getProcessColorChannelIndexStart();
const uint8_t channelEnd = pixelFormat.getProcessColorChannelIndexEnd();
const uint8_t opacityChannel = pixelFormat.getOpacityChannelIndex();
PDFFloatBitmapWithColorSpace paperImage(floatImage.getWidth(), floatImage.getHeight(), floatImage.getPixelFormat(), floatImage.getColorSpace());
paperImage.makeOpaque();
paperImage.fillChannel(0, paperColor[0]);
paperImage.fillChannel(1, paperColor[1]);
paperImage.fillChannel(2, paperColor[2]);
for (int y = 0; y < height; ++y)
{
quint8* pixels = reinterpret_cast<quint8*>(image.bits() + y * image.bytesPerLine());
PDFFloatBitmap softMask(paperImage.getWidth(), paperImage.getHeight(), PDFPixelFormat::createOpacityMask());
softMask.makeOpaque();
for (int x = 0; x < width; ++x)
{
PDFConstColorBuffer colorBuffer = floatImage.getPixel(x, y);
QRect blendRegion(0, 0, floatImage.getWidth(), floatImage.getHeight());
PDFFloatBitmapWithColorSpace::blend(floatImage, paperImage, paperImage, paperImage, softMask, false, 1.0f, BlendMode::Normal, false, 0xFFFF, PDFFloatBitmap::OverprintMode::NoOveprint, blendRegion);
for (uint8_t channel = channelStart; channel < channelEnd; ++channel)
{
*pixels++ = quint8(colorBuffer[channel] * scale);
}
*pixels++ = quint8(colorBuffer[opacityChannel] * scale);
}
}
}
return toImageImpl(paperImage, use16Bit);
}
return image;