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gsk: Document blend modes

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Add some information about blend modes, mostly taken
from the css compositing spec.

Fixes: #2739
This commit is contained in:
Matthias Clasen 2020-05-18 18:21:39 -04:00
parent 15f7d2a27d
commit ec2aac5b61
1 changed files with 19 additions and 14 deletions
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33
gsk/gskenums.h
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@ -98,25 +98,30 @@ typedef enum {
* @GSK_BLEND_MODE_DEFAULT: The default blend mode, which specifies no blending
* @GSK_BLEND_MODE_MULTIPLY: The source color is multiplied by the destination
* and replaces the destination
* @GSK_BLEND_MODE_SCREEN: ...
* @GSK_BLEND_MODE_OVERLAY: ...
* @GSK_BLEND_MODE_DARKEN: ...
* @GSK_BLEND_MODE_LIGHTEN: ...
* @GSK_BLEND_MODE_COLOR_DODGE: ...
* @GSK_BLEND_MODE_COLOR_BURN: ...
* @GSK_BLEND_MODE_HARD_LIGHT: ...
* @GSK_BLEND_MODE_SOFT_LIGHT: ...
* @GSK_BLEND_MODE_DIFFERENCE: ...
* @GSK_BLEND_MODE_EXCLUSION: ...
* @GSK_BLEND_MODE_COLOR: ...
* @GSK_BLEND_MODE_HUE: ...
* @GSK_BLEND_MODE_SATURATION: ...
* @GSK_BLEND_MODE_LUMINOSITY: ...
* @GSK_BLEND_MODE_SCREEN: Multiplies the complements of the destination and source
* color values, then complements the result.
* @GSK_BLEND_MODE_OVERLAY: Multiplies or screens the colors, depending on the
* destination color value. This is the inverse of hard-list
* @GSK_BLEND_MODE_DARKEN: Selects the darker of the destination and source colors
* @GSK_BLEND_MODE_LIGHTEN: Selects the lighter of the destination and source colors
* @GSK_BLEND_MODE_COLOR_DODGE: Brightens the destination color to reflect the source color
* @GSK_BLEND_MODE_COLOR_BURN: Darkens the destination color to reflect the source color
* @GSK_BLEND_MODE_HARD_LIGHT: Multiplies or screens the colors, depending on the source color value
* @GSK_BLEND_MODE_SOFT_LIGHT: Darkens or lightens the colors, depending on the source color value
* @GSK_BLEND_MODE_DIFFERENCE: Subtracts the darker of the two constituent colors from the lighter color
* @GSK_BLEND_MODE_EXCLUSION: Produces an effect similar to that of the difference mode but lower in contrast
* @GSK_BLEND_MODE_COLOR: Creates a color with the hue and saturation of the source color and the luminosity of the destination color
* @GSK_BLEND_MODE_HUE: Creates a color with the hue of the source color and the saturation and luminosity of the destination color
* @GSK_BLEND_MODE_SATURATION: Creates a color with the saturation of the source color and the hue and luminosity of the destination color
* @GSK_BLEND_MODE_LUMINOSITY: Creates a color with the luminosity of the source color and the hue and saturation of the destination color
*
* The blend modes available for render nodes.
*
* The implementation of each blend mode is deferred to the
* rendering pipeline.
*
* See https://www.w3.org/TR/compositing-1/#blending for more information
* on blending and blend modes.
*/
typedef enum {
GSK_BLEND_MODE_DEFAULT = 0,