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Plot style: Add half lighten/darken helper variants.

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This commit is contained in:
Michael Drake 2020-04-07 21:11:06 +01:00
parent 02400588e4
commit 30b9c088b0
1 changed files with 11 additions and 0 deletions
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11
include/netsurf/plot_style.h
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@ -124,6 +124,11 @@ typedef struct plot_font_style {
} plot_font_style_t;
/* Darken a colour by taking seven eighths of each channel's intensity */
#define half_darken_colour(c1) \
((((7 * (c1 & 0xff00ff)) >> 3) & 0xff00ff) | \
(((7 * (c1 & 0x00ff00)) >> 3) & 0x00ff00))
/* Darken a colour by taking three quarters of each channel's intensity */
#define darken_colour(c1) \
((((3 * (c1 & 0xff00ff)) >> 2) & 0xff00ff) | \
@ -134,6 +139,12 @@ typedef struct plot_font_style {
((((9 * (c1 & 0xff00ff)) >> 4) & 0xff00ff) | \
(((9 * (c1 & 0x00ff00)) >> 4) & 0x00ff00))
/* Lighten a colour by taking seven eighths of each channel's intensity
* and adding a full one eighth intensity */
#define half_lighten_colour(c1) \
(((((7 * (c1 & 0xff00ff)) >> 3) + 0x200020) & 0xff00ff) | \
((((7 * (c1 & 0x00ff00)) >> 3) + 0x002000) & 0x00ff00))
/* Lighten a colour by taking 12/16ths of each channel's intensity
* and adding a full 4/16ths intensity */
#define lighten_colour(c1) \