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Advanced blending

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Jakub Melka
2021-01-23 19:03:12 +01:00
parent ea62e6ee32
commit 443c656a46
6 changed files with 442 additions and 0 deletions
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27
Pdf4QtLib/sources/pdfblendfunction.h
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@ -69,6 +69,12 @@ public:
/// \param mode Blend mode
static bool isSupportedByQt(BlendMode mode);
/// Returns true, if blend mode is separable
static bool isSeparable(BlendMode mode);
/// Returns true, if blend mode is white-preserving (i.e. B(1.0, 1.0) == 1.0)
static bool isWhitePreserving(BlendMode mode);
/// Returns composition mode for Qt drawing subsystem from blend mode defined
/// in PDF standard. If blend mode is not supported by Qt drawing subsystem, then default
/// composition mode is returned.
@ -160,6 +166,27 @@ public:
/// \param Cs Source color
static PDFCMYK blend_Luminosity(PDFCMYK Cb, PDFCMYK Cs);
/// Blend non-separabe. It is incorrect to call this function
/// with blend mode, which is separable.
/// \param mode Non-separable blend mode
/// \param Cb Backdrop color
/// \param Cs Source color
static PDFGray blend_Nonseparable(BlendMode mode, PDFGray Cb, PDFGray Cs);
/// Blend non-separabe. It is incorrect to call this function
/// with blend mode, which is separable.
/// \param mode Non-separable blend mode
/// \param Cb Backdrop color
/// \param Cs Source color
static PDFRGB blend_Nonseparable(BlendMode mode, PDFRGB Cb, PDFRGB Cs);
/// Blend non-separabe. It is incorrect to call this function
/// with blend mode, which is separable.
/// \param mode Non-separable blend mode
/// \param Cb Backdrop color
/// \param Cs Source color
static PDFCMYK blend_Nonseparable(BlendMode mode, PDFCMYK Cb, PDFCMYK Cs);
/// Union function
static constexpr PDFColorComponent blend_Union(PDFColorComponent b, PDFColorComponent s) { return b + s - b * s; }