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[paint] Document composition modes

This commit is contained in:
Behdad Esfahbod 2022-12-27 12:29:53 -07:00
parent ec9e8a5993
commit 43b0364eda
1 changed files with 60 additions and 0 deletions
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60
src/hb-paint.h
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@ -325,6 +325,8 @@ typedef struct {
*
* See the OpenType spec [COLR](https://learn.microsoft.com/en-us/typography/opentype/spec/colr)
* section for details.
*
* Since: REPLACEME
*/
typedef enum {
HB_PAINT_EXTEND_PAD,
@ -515,6 +517,62 @@ typedef void (*hb_paint_sweep_gradient_func_t) (hb_paint_funcs_t *funcs,
/**
* hb_paint_composite_mode_t:
* @HB_PAINT_COMPOSITE_MODE_CLEAR: clear destination layer (bounded)
* @HB_PAINT_COMPOSITE_MODE_SRC: replace destination layer (bounded)
* @HB_PAINT_COMPOSITE_MODE_SRC_OVER: draw source layer on top of destination layer
* (bounded)
* @HB_PAINT_COMPOSITE_MODE_SRC_IN: draw source where there was destination content
* (unbounded)
* @HB_PAINT_COMPOSITE_MODE_SRC_OUT: draw source where there was no destination
* content (unbounded)
* @HB_PAINT_COMPOSITE_MODE_SRC_ATOP: draw source on top of destination content and
* only there
* @HB_PAINT_COMPOSITE_MODE_DEST: ignore the source
* @HB_PAINT_COMPOSITE_MODE_DEST_OVER: draw destination on top of source
* @HB_PAINT_COMPOSITE_MODE_DEST_IN: leave destination only where there was
* source content (unbounded)
* @HB_PAINT_COMPOSITE_MODE_DEST_OUT: leave destination only where there was no
* source content
* @HB_PAINT_COMPOSITE_MODE_DEST_ATOP: leave destination on top of source content
* and only there (unbounded)
* @HB_PAINT_COMPOSITE_MODE_XOR: source and destination are shown where there is only
* one of them
* @HB_PAINT_COMPOSITE_MODE_PLUS: source and destination layers are accumulated
* @HB_PAINT_COMPOSITE_MODE_MULTIPLY: source and destination layers are multiplied.
* This causes the result to be at least as dark as the darker inputs.
* @HB_PAINT_COMPOSITE_MODE_SCREEN: source and destination are complemented and
* multiplied. This causes the result to be at least as light as the lighter
* inputs.
* @HB_PAINT_COMPOSITE_MODE_OVERLAY: multiplies or screens, depending on the
* lightness of the destination color.
* @HB_PAINT_COMPOSITE_MODE_DARKEN: replaces the destination with the source if it
* is darker, otherwise keeps the source.
* @HB_PAINT_COMPOSITE_MODE_LIGHTEN: replaces the destination with the source if it
* is lighter, otherwise keeps the source.
* @HB_PAINT_COMPOSITE_MODE_COLOR_DODGE: brightens the destination color to reflect
* the source color.
* @HB_PAINT_COMPOSITE_MODE_COLOR_BURN: darkens the destination color to reflect
* the source color.
* @HB_PAINT_COMPOSITE_MODE_HARD_LIGHT: Multiplies or screens, dependent on source
* color.
* @HB_PAINT_COMPOSITE_MODE_SOFT_LIGHT: Darkens or lightens, dependent on source
* color.
* @HB_PAINT_COMPOSITE_MODE_DIFFERENCE: Takes the difference of the source and
* destination color.
* @HB_PAINT_COMPOSITE_MODE_EXCLUSION: Produces an effect similar to difference, but
* with lower contrast.
* @HB_PAINT_COMPOSITE_MODE_HSL_HUE: Creates a color with the hue of the source
* and the saturation and luminosity of the target.
* @HB_PAINT_COMPOSITE_MODE_HSL_SATURATION: Creates a color with the saturation
* of the source and the hue and luminosity of the target. Painting with
* this mode onto a gray area produces no change.
* @HB_PAINT_COMPOSITE_MODE_HSL_COLOR: Creates a color with the hue and saturation
* of the source and the luminosity of the target. This preserves the gray
* levels of the target and is useful for coloring monochrome images or
* tinting color images.
* @HB_PAINT_COMPOSITE_MODE_HSL_LUMINOSITY: Creates a color with the luminosity of
* the source and the hue and saturation of the target. This produces an
* inverse effect to @HB_PAINT_COMPOSITE_MODE_HSL_COLOR.
*
* The values of this enumeration describe the compositing modes
* that can be used when combining temporary redirected drawing
@ -522,6 +580,8 @@ typedef void (*hb_paint_sweep_gradient_func_t) (hb_paint_funcs_t *funcs,
*
* See the OpenType spec [COLR](https://learn.microsoft.com/en-us/typography/opentype/spec/colr)
* section for details.
*
* Since: REPLACEME
*/
typedef enum {
HB_PAINT_COMPOSITE_MODE_CLEAR,