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author | Michael Drake <tlsa@netsurf-browser.org> | 2013-02-12 21:16:30 +0000 |
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committer | Michael Drake <tlsa@netsurf-browser.org> | 2013-02-12 21:16:30 +0000 |
commit | 13574018d12a7077cdcf2ac502c7217a3eb5453b (patch) | |
tree | 1d99880313f5731b8dae419cf18f31f69d979c5a /desktop | |
parent | 15e61743a3569f1755d8a2eb2b20418c7df556db (diff) | |
download | netsurf-13574018d12a7077cdcf2ac502c7217a3eb5453b.tar.gz netsurf-13574018d12a7077cdcf2ac502c7217a3eb5453b.tar.bz2 |
Fun micro-optimisations.
Diffstat (limited to 'desktop')
-rw-r--r-- | desktop/plot_style.h | 36 |
1 files changed, 15 insertions, 21 deletions
diff --git a/desktop/plot_style.h b/desktop/plot_style.h index b4e7ab8f9..f965a2578 100644 --- a/desktop/plot_style.h +++ b/desktop/plot_style.h @@ -31,38 +31,32 @@ /* Darken a colour by taking three quarters of each channel's intensity */ #define darken_colour(c1) \ - ((((3 * ((c1 >> 16) & 0xff)) >> 2) << 16) | \ - (((3 * ((c1 >> 8) & 0xff)) >> 2) << 8) | \ - (((3 * ( c1 & 0xff)) >> 2) << 0)) + ((((3 * (c1 & 0xff00ff)) >> 2) & 0xff00ff) | \ + (((3 * (c1 & 0x00ff00)) >> 2) & 0x00ff00)) /* Darken a colour by taking nine sixteenths of each channel's intensity */ -#define double_darken_colour(c1) \ - ((((9 * ((c1 >> 16) & 0xff)) >> 4) << 16) | \ - (((9 * ((c1 >> 8) & 0xff)) >> 4) << 8) | \ - (((9 * ( c1 & 0xff)) >> 4) << 0)) +#define double_darken_colour(c1) \ + ((((9 * (c1 & 0xff00ff)) >> 4) & 0xff00ff) | \ + (((9 * (c1 & 0x00ff00)) >> 4) & 0x00ff00)) -/* Lighten a colour by taking three quarters of each channel's intensity - * and adding a full quarter - */ +/* Lighten a colour by taking 12/16ths of each channel's intensity + * and adding a full 4/16ths intensity */ #define lighten_colour(c1) \ - (((((3 * ((c1 >> 16) & 0xff)) >> 2) + 64) << 16) | \ - ((((3 * ((c1 >> 8) & 0xff)) >> 2) + 64) << 8) | \ - ((((3 * ( c1 & 0xff)) >> 2) + 64) << 0)) + (((((3 * (c1 & 0xff00ff)) >> 2) + 0x400040) & 0xff00ff) | \ + ((((3 * (c1 & 0x00ff00)) >> 2) + 0x004000) & 0x00ff00)) -/* Lighten a colour by taking nine sixteenths of each channel's intensity and - * adding a full intensity 7/16ths */ +/* Lighten a colour by taking 9/16ths of each channel's intensity + * and adding a full 7/16ths intensity */ #define double_lighten_colour(c1) \ - (((((9 * ((c1 >> 16) & 0xff)) >> 4) + 112) << 16) | \ - ((((9 * ((c1 >> 8) & 0xff)) >> 4) + 112) << 8) | \ - ((((9 * ( c1 & 0xff)) >> 4) + 112) << 0)) + (((((9 * (c1 & 0xff00ff)) >> 4) + 0x700070) & 0xff00ff) | \ + ((((9 * (c1 & 0x00ff00)) >> 4) + 0x007000) & 0x00ff00)) /* Blend two colours by taking half the intensity of each channel in the first * colour and adding them to half the intensity of each channel in the second * colour */ #define blend_colour(c0, c1) \ - (((((c0 >> 16) & 0xff) + ((c1 >> 16) & 0xff)) >> 1) << 16) | \ - (((((c0 >> 8) & 0xff) + ((c1 >> 8) & 0xff)) >> 1) << 8) | \ - (((( c0 & 0xff) + ( c1 & 0xff)) >> 1) << 0) + (((((c0 & 0xff00ff) + (c1 & 0xff00ff)) >> 1) & 0xff00ff) | \ + ((((c0 & 0x00ff00) + (c1 & 0x00ff00)) >> 1) & 0x00ff00)) /* Choose either black or white, depending on which is furthest from the * percieved lightness of the supplied colour, c0. */ |