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Issue #50: Color masking with indexed color space

This commit is contained in:
Jakub Melka 2023-04-30 18:28:25 +02:00
parent 349efcbf88
commit 5db941954f
1 changed files with 75 additions and 0 deletions
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75
Pdf4QtLib/sources/pdfcolorspaces.cpp
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@ -1982,6 +1982,81 @@ QImage PDFIndexedColorSpace::getImage(const PDFImageData& imageData,
return image;
}
case PDFImageData::MaskingType::ColorKeyMasking:
{
QImage image(imageData.getWidth(), imageData.getHeight(), QImage::Format_RGBA8888);
image.fill(QColor(Qt::transparent));
unsigned int componentCount = imageData.getComponents();
if (componentCount != getColorComponentCount())
{
throw PDFException(PDFTranslationContext::tr("Invalid colors for color space. Color space has %1 colors. Provided color count is %4.").arg(getColorComponentCount()).arg(componentCount));
}
Q_ASSERT(componentCount > 0);
const std::vector<PDFInteger>& colorKeyMask = imageData.getColorKeyMask();
if (colorKeyMask.size() / 2 != componentCount)
{
throw PDFException(PDFTranslationContext::tr("Invalid number of color components in color key mask. Expected %1, provided %2.").arg(2 * componentCount).arg(colorKeyMask.size()));
}
const std::vector<PDFReal>& decode = imageData.getDecode();
if (!decode.empty() && decode.size() != componentCount * 2)
{
throw PDFException(PDFTranslationContext::tr("Invalid size of the decoded array. Expected %1, actual %2.").arg(componentCount * 2).arg(decode.size()));
}
PDFBitReader reader(&imageData.getData(), imageData.getBitsPerComponent());
PDFColor color;
color.resize(componentCount);
const PDFReal max = reader.max();
for (unsigned int i = 0, rowCount = imageData.getHeight(); i < rowCount; ++i)
{
reader.seek(i * imageData.getStride());
unsigned char* outputLine = image.scanLine(i);
for (unsigned int j = 0; j < imageData.getWidth(); ++j)
{
// Number of masked-out colors
unsigned int maskedColors = 0;
for (unsigned int k = 0; k < componentCount; ++k)
{
PDFBitReader::Value value = reader.read();
// Interpolate value, if decode is not empty
if (!decode.empty())
{
color[k] = interpolate(value, 0.0, max, decode[2 * k], decode[2 * k + 1]);
}
else
{
color[k] = value;
}
Q_ASSERT(2 * k + 1 < colorKeyMask.size());
if (static_cast<std::decay<decltype(colorKeyMask)>::type::value_type>(value) >= colorKeyMask[2 * k] &&
static_cast<std::decay<decltype(colorKeyMask)>::type::value_type>(value) <= colorKeyMask[2 * k + 1])
{
++maskedColors;
}
}
QColor transformedColor = getColor(color, cms, intent, reporter, false);
QRgb rgb = transformedColor.rgb();
*outputLine++ = qRed(rgb);
*outputLine++ = qGreen(rgb);
*outputLine++ = qBlue(rgb);
*outputLine++ = (maskedColors == componentCount) ? 0x00 : 0xFF;
}
}
return image;
}
default:
throw PDFRendererException(RenderErrorType::NotImplemented, PDFTranslationContext::tr("Image masking not implemented!"));
}