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Implement calibrated color support, including constants for a few standard

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color spaces and a new color patch test page.

The grayscale test image from CUPS wasn't actually grayscale.
This commit is contained in:
Michael R Sweet
2021-05-31 09:31:00 -04:00
parent 627b04d9f0
commit c4e0421f62
4 changed files with 532 additions and 93 deletions
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23
pdfio-content.h
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@@ -59,16 +59,23 @@ typedef enum pdfio_textrendering_e // Text rendering modes
PDFIO_TEXTRENDERING_TEXT_PATH // Add text to path (invisible)
} pdfio_textrendering_t;
extern const double pdfioAdobeRGBGamma;
extern const double pdfioAdobeRGBGamma PDFIO_PUBLIC;
// AdobeRGB gamma
extern const double pdfioAdobeRGBWhitePoint[];
extern const double pdfioAdobeRGBMatrix[3][3] PDFIO_PUBLIC;
// AdobeRGB matrix
extern const double pdfioAdobeRGBWhitePoint[3] PDFIO_PUBLIC;
// AdobeRGB white point
extern const double pdfioDisplayP3Gamma;
extern const double pdfioDisplayP3Gamma PDFIO_PUBLIC;
// Display P3 gamma
extern const double pdfioDisplayP3WhitePoint[];
extern const double pdfioDisplayP3Matrix[3][3] PDFIO_PUBLIC;
// Display P3 matrix
extern const double pdfioDisplayP3WhitePoint[3] PDFIO_PUBLIC;
// Display P3 white point
extern const double pdfioSRGBGamma; // sRGB gamma
extern const double pdfioSRGBWhitePoint[];
extern const double pdfioSRGBGamma PDFIO_PUBLIC;
// sRGB gamma
extern const double pdfioSRGBMatrix[3][3] PDFIO_PUBLIC;
// sRGB matrix
extern const double pdfioSRGBWhitePoint[3] PDFIO_PUBLIC;
// sRGB white point
@@ -93,7 +100,7 @@ extern bool pdfioContentPathCurve13(pdfio_stream_t *st, double x1, double y1, d
extern bool pdfioContentPathCurve23(pdfio_stream_t *st, double x2, double y2, double x3, double y3) PDFIO_PUBLIC;
extern bool pdfioContentPathLineTo(pdfio_stream_t *st, double x, double y) PDFIO_PUBLIC;
extern bool pdfioContentPathMoveTo(pdfio_stream_t *st, double x, double y) PDFIO_PUBLIC;
extern bool pdfioContentPathRect(pdfio_stream_t *st, pdfio_rect_t *rect) PDFIO_PUBLIC;
extern bool pdfioContentPathRect(pdfio_stream_t *st, double x, double y, double width, double height) PDFIO_PUBLIC;
extern bool pdfioContentRestore(pdfio_stream_t *st) PDFIO_PUBLIC;
extern bool pdfioContentSave(pdfio_stream_t *st) PDFIO_PUBLIC;
extern bool pdfioContentSetDashPattern(pdfio_stream_t *st, int phase, int on, int off) PDFIO_PUBLIC;
@@ -140,7 +147,7 @@ extern double pdfioImageGetWidth(pdfio_obj_t *obj) PDFIO_PUBLIC;
// Page dictionary helpers...
extern bool pdfioPageDictAddICCColorSpace(pdfio_dict_t *dict, const char *name, pdfio_obj_t *obj) PDFIO_PUBLIC;
extern bool pdfioPageDictAddCalibratedColorSpace(pdfio_dict_t *dict, const char *name, size_t num_colors, const double *white_point, double gamma) PDFIO_PUBLIC;
extern bool pdfioPageDictAddCalibratedColorSpace(pdfio_dict_t *dict, const char *name, size_t num_colors, double gamma, const double matrix[3][3], const double white_point[3]) PDFIO_PUBLIC;
extern bool pdfioPageDictAddFont(pdfio_dict_t *dict, const char *name, pdfio_obj_t *obj) PDFIO_PUBLIC;
extern bool pdfioPageDictAddImage(pdfio_dict_t *dict, const char *name, pdfio_obj_t *obj) PDFIO_PUBLIC;