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16-bit color adjustments: save 6 divisions per graph by using precalculated values

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git-svn-id: https://conky.svn.sourceforge.net/svnroot/conky/trunk/conky@247 7f574dfc-610e-0410-a909-a81674777703
This commit is contained in:
Johannes Winkelmann 2005-08-30 19:13:01 +00:00
parent 6ff47b6101
commit 4ee616c528
1 changed files with 7 additions and 3 deletions
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10
src/conky.c
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@ -527,6 +527,10 @@ inline void graph_append(struct special_t *graph, double f)
short colour_depth = 0;
void set_up_gradient();
/* precalculated: 31/255, and 63/255 */
#define CONST_8_TO_5_BITS 0.12156862745098
#define CONST_8_TO_6_BITS 0.247058823529412
/* adjust color values depending on color depth*/
static unsigned int adjust_colors(unsigned int color)
{
@ -538,9 +542,9 @@ static unsigned int adjust_colors(unsigned int color)
r = (color & 0xff0000) >> 16;
g = (color & 0xff00) >> 8;
b = color & 0xff;
color = (int)(r / 0xff * 0x1f) << 11;
color |= (int)(g / 0xff * 0x3f) << 5;
color |= (int)(b / 0xff * 0x1f);
color = (int)(r * CONST_8_TO_5_BITS) << 11;
color |= (int)(g * CONST_8_TO_6_BITS) << 5;
color |= (int)(b * CONST_8_TO_5_BITS);
}
return color;
}