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colorspace: Add gdk_color_space_get_named ()

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And add a bunch of common color spaces
This commit is contained in:
Benjamin Otte
2021-10-25 22:55:34 +02:00
parent c70a8def57
commit abbd7f0c92
3 changed files with 129 additions and 0 deletions
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83
gdk/gdkcolorspace.c
View File

@@ -159,6 +159,89 @@ gdk_color_space_get_srgb (void)
return srgb_profile;
}
GdkColorSpace *
gdk_color_space_get_named (GdkNamedColorSpace name)
{
static GdkColorSpace *space_array[GDK_NAMED_COLOR_SPACE_N_SPACES];
static GdkColorSpace **color_spaces;
g_return_val_if_fail (name < GDK_NAMED_COLOR_SPACE_N_SPACES, gdk_color_space_get_srgb ());
if (g_once_init_enter (&color_spaces))
{
static const cmsCIExyY D65 = { 0.3127, 0.3290, 1.0 };
static const cmsFloat64Number srgb_tonecurve[5] = { 2.4, 1. / 1.055, 0.055 / 1.055, 1. / 12.92, 0.04045 };
static const cmsFloat64Number rec709_tonecurve[5] = { 1.0 / 0.45, 1.0 / 1.099, 0.099 / 1.099, 1.0 / 4.5, 0.081 };
cmsToneCurve *curve;
cmsHPROFILE lcms_profile;
space_array[GDK_NAMED_COLOR_SPACE_SRGB] = g_object_ref (gdk_color_space_get_srgb ());
curve = cmsBuildGamma (NULL, 1.0);
lcms_profile = cmsCreateRGBProfile (&D65,
&(cmsCIExyYTRIPLE) {
{ 0.640, 0.330, 1.0 },
{ 0.300, 0.600, 1.0 },
{ 0.150, 0.060, 1.0 }
},
(cmsToneCurve*[3]) { curve, curve, curve });
cmsFreeToneCurve (curve);
space_array[GDK_NAMED_COLOR_SPACE_SRGB_LINEAR] = gdk_lcms_color_space_new_from_lcms_profile (lcms_profile);
space_array[GDK_NAMED_COLOR_SPACE_XYZ_D50] = gdk_lcms_color_space_new_from_lcms_profile (cmsCreateXYZProfile ());
/* XXX: This needs a D65 whitepoint here */
space_array[GDK_NAMED_COLOR_SPACE_XYZ_D65] = gdk_lcms_color_space_new_from_lcms_profile (cmsCreateXYZProfile ());
curve = cmsBuildParametricToneCurve (NULL, 4, srgb_tonecurve);
lcms_profile = cmsCreateRGBProfile (&D65,
&(cmsCIExyYTRIPLE) {
{ 0.680, 0.320, 1.0 },
{ 0.265, 0.690, 1.0 },
{ 0.150, 0.060, 1.0 }
},
(cmsToneCurve*[3]) { curve, curve, curve });
cmsFreeToneCurve (curve);
space_array[GDK_NAMED_COLOR_SPACE_DISPLAY_P3] = gdk_lcms_color_space_new_from_lcms_profile (lcms_profile);
curve = cmsBuildGamma(NULL, 2.19921875);
lcms_profile = cmsCreateRGBProfile (&D65,
&(cmsCIExyYTRIPLE) {
{ 0.640, 0.330, 1.0 },
{ 0.210, 0.710, 1.0 },
{ 0.150, 0.060, 1.0 }
},
(cmsToneCurve*[3]) { curve, curve, curve });
cmsFreeToneCurve (curve);
space_array[GDK_NAMED_COLOR_SPACE_A98_RGB] = gdk_lcms_color_space_new_from_lcms_profile (lcms_profile);
curve = cmsBuildParametricToneCurve (NULL, 4, rec709_tonecurve);
lcms_profile = cmsCreateRGBProfile (cmsD50_xyY (),
&(cmsCIExyYTRIPLE) {
{ 0.734699, 0.265301, 1.0 },
{ 0.159597, 0.840403, 1.0 },
{ 0.036598, 0.000105, 1.0 }
},
(cmsToneCurve*[3]) { curve, curve, curve });
cmsFreeToneCurve (curve);
space_array[GDK_NAMED_COLOR_SPACE_PROPHOTO_RGB] = gdk_lcms_color_space_new_from_lcms_profile (lcms_profile);
curve = cmsBuildParametricToneCurve (NULL, 4, rec709_tonecurve);
lcms_profile = cmsCreateRGBProfile (&D65,
&(cmsCIExyYTRIPLE) {
{ 0.708, 0.292, 1.0 },
{ 0.170, 0.797, 1.0 },
{ 0.131, 0.046, 1.0 }
},
(cmsToneCurve*[3]) { curve, curve, curve });
cmsFreeToneCurve (curve);
space_array[GDK_NAMED_COLOR_SPACE_REC2020] = gdk_lcms_color_space_new_from_lcms_profile (lcms_profile);
g_once_init_leave (&color_spaces, space_array);
}
return color_spaces[name];
}
/**
* gdk_color_space_supports_format:
* @self: a `GdkColorSpace`

2
gdk/gdkcolorspace.h
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@@ -47,6 +47,8 @@ GType gdk_color_space_get_type (void) G_GNUC_CO
GDK_AVAILABLE_IN_4_6
GdkColorSpace * gdk_color_space_get_srgb (void) G_GNUC_CONST;
GDK_AVAILABLE_IN_4_6
GdkColorSpace * gdk_color_space_get_named (GdkNamedColorSpace name) G_GNUC_CONST;
GDK_AVAILABLE_IN_4_6
GdkColorSpace * gdk_color_space_new_from_icc_profile (GBytes *icc_profile,

44
gdk/gdkenums.h
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@@ -331,6 +331,50 @@ typedef enum {
GDK_MEMORY_N_FORMATS
} GdkMemoryFormat;
/**
* GdkNamedColorSpace:
* @GDK_NAMED_COLOR_SPACE_SRGB: the sRGB color space,
* see gdk_color_space_get_srgb() for details
* @GDK_NAMED_COLOR_SPACE_SRGB_LINEAR: the same sRGB color space, but
* with a linear light tone curve
* @GDK_NAMED_COLOR_SPACE_XYZ_D50: the CIE XYZ color space, with the D50
* white point
* @GDK_NAMED_COLOR_SPACE_XYZ_D65: the CIE CYZ color space, with the D65
* white point
* @GDK_NAMED_COLOR_SPACE_DISPLAY_P3: the [DCI P3](https://en.wikipedia.org/wiki/DCI-P3)
* color space with a D65 whitepoint as created by Apple
* @GDK_NAMED_COLOR_SPACE_A98_RGB: the [Adobe 1998 RGB](https://en.wikipedia.org/wiki/Adobe_RGB_color_space)
* color space
* @GDK_NAMED_COLOR_SPACE_PROPHOTO_RGB: the [ProPhoto RGB](https://en.wikipedia.org/wiki/ProPhoto_RGB_color_space)
* color space
* @GDK_NAMED_COLOR_SPACE_REC2020: the [Rec 2020](https://en.wikipedia.org/wiki/Rec._2020)
* color space
* @GDK_NAMED_COLOR_SPACE_N_SPACES: The number of named color spaces.
* This value will change as more color spaces get added, so do not
* rely on its concrete integer.
*
*
* The list of predefined color spaces. GDK provides the common
* color spaces used by CSS and other standards so applications can make
* use of them.
*
* More color spaces may be added in the future.
*
* Since: 4.6
**/
typedef enum {
GDK_NAMED_COLOR_SPACE_SRGB,
GDK_NAMED_COLOR_SPACE_SRGB_LINEAR,
GDK_NAMED_COLOR_SPACE_XYZ_D50,
GDK_NAMED_COLOR_SPACE_XYZ_D65,
GDK_NAMED_COLOR_SPACE_DISPLAY_P3,
GDK_NAMED_COLOR_SPACE_A98_RGB,
GDK_NAMED_COLOR_SPACE_PROPHOTO_RGB,
GDK_NAMED_COLOR_SPACE_REC2020,
GDK_NAMED_COLOR_SPACE_N_SPACES
} GdkNamedColorSpace;
G_END_DECLS
#endif /* __GDK_ENUMS_H__ */