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Blend functions

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Jakub Melka
2021-01-14 19:33:23 +01:00
parent ccb84401db
commit d3827cfcc4
8 changed files with 452 additions and 20 deletions
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44
Pdf4QtLib/sources/pdfblendfunction.h
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@ -88,6 +88,50 @@ public:
static std::vector<BlendMode> getBlendModes();
};
/// Class grouping together blend functions. Can also blend non-separable blend modes,
/// such as Color, Hue, Saturation and Luminosity, according 11.3.5.3 of PDF 2.0 specification.
class PDFBlendFunction
{
public:
PDFBlendFunction() = delete;
/// Blend function used to blend separable blend modes
/// \param Cb Backdrop color
/// \param Cs Source color
static PDFColorComponent blend(BlendMode mode, PDFColorComponent Cb, PDFColorComponent Cs);
/// Blend non-separable hue function
/// \param Cb Backdrop color
/// \param Cs Source color
static PDFRGB blend_Hue(PDFRGB Cb, PDFRGB Cs);
/// Blend non-separable saturation function
/// \param Cb Backdrop color
/// \param Cs Source color
static PDFRGB blend_Saturation(PDFRGB Cb, PDFRGB Cs);
/// Blend non-separable color function
/// \param Cb Backdrop color
/// \param Cs Source color
static PDFRGB blend_Color(PDFRGB Cb, PDFRGB Cs);
/// Blend non-separable luminosity function
/// \param Cb Backdrop color
/// \param Cs Source color
static PDFRGB blend_Luminosity(PDFRGB Cb, PDFRGB Cs);
private:
static PDFRGB nonseparable_gray2rgb(PDFGray gray);
static PDFGray nonseparable_rgb2gray(PDFRGB rgb);
static PDFRGB nonseparable_cmyk2rgb(PDFCMYK cmyk);
static PDFCMYK nonseparable_rgb2cmyk(PDFRGB rgb, PDFColorComponent K);
static PDFColorComponent nonseparable_Lum(PDFRGB rgb);
static PDFColorComponent nonseparable_Sat(PDFRGB rgb);
static PDFRGB nonseparable_SetLum(PDFRGB C, PDFColorComponent l);
static PDFRGB nonseparable_SetSat(PDFRGB C, PDFColorComponent s);
static PDFRGB nonseparable_ClipColor(PDFRGB C);
};
} // namespace pdf
#endif // PDFBLENDFUNCTION_H