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Plot style: Split lightness calc out of colour_to_bw_furthest macro.

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This commit is contained in:
Michael Drake 2020-02-23 16:56:15 +00:00
parent 8a834918e3
commit 6783deba4e
1 changed files with 7 additions and 4 deletions
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11
include/netsurf/plot_style.h
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@ -153,13 +153,16 @@ typedef struct plot_font_style {
(((((c0 & 0xff00ff) + (c1 & 0xff00ff)) >> 1) & 0xff00ff) | \
((((c0 & 0x00ff00) + (c1 & 0x00ff00)) >> 1) & 0x00ff00))
/* Get the percieved lightness of the supplied colour, c0. */
#define colour_lightness(c0) \
((((c0 & 0x0000ff) * 77) >> 8) + \
(((c0 & 0x00ff00) * 151) >> 16) + \
(((c0 & 0xff0000) * 28) >> 24))
/* Choose either black or white, depending on which is furthest from the
* percieved lightness of the supplied colour, c0. */
#define colour_to_bw_furthest(c0) \
((((((c0 & 0x0000ff) * 77) >> 8) + \
(((c0 & 0x00ff00) * 151) >> 16) + \
(((c0 & 0xff0000) * 28) >> 24)) > \
(0xff / 2)) ? 0x000000 : 0xffffff)
((colour_lightness(c0) > (0xff / 2)) ? 0x000000 : 0xffffff)
/* Mix two colours according to the proportion given by p, where 0 <= p <= 255
* p = 0 gives result ==> c1, p = 255 gives result ==> c0 */