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Plot style: Helper macro to get nearest of black and white.

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This commit is contained in:
Michael Drake 2020-05-23 21:31:05 +01:00
parent 60f8f0126d
commit 3626a5654e
1 changed files with 5 additions and 0 deletions
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5
include/netsurf/plot_style.h
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@ -170,6 +170,11 @@ typedef struct plot_font_style {
(((c0 & 0x00ff00) * 151) >> 16) + \
(((c0 & 0xff0000) * 28) >> 24))
/* Choose either black or white, depending on which is nearest to the
* percieved lightness of the supplied colour, c0. */
#define colour_to_bw_nearest(c0) \
((colour_lightness(c0) > (0xff / 2)) ? 0xffffff : 0x000000)
/* 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) \