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Merge pull request #88 from lucaslugao/master

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Premultiply background RGB values if alpha is used
This commit is contained in:
Luke Smith
2019-05-23 23:02:08 -04:00
committed by GitHub
parent d06bf1fd7e ffcacfa98d
commit e2046555c0
1 changed files with 9 additions and 3 deletions
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12
x.c
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@@ -784,9 +784,15 @@ xloadcols(void)
/* set alpha value of bg color */
if (opt_alpha)
alpha = strtof(opt_alpha, NULL);
dc.col[defaultbg].color.alpha = (unsigned short)(0xffff * alpha);
dc.col[defaultbg].pixel &= 0x00FFFFFF;
dc.col[defaultbg].pixel |= (unsigned char)(0xff * alpha) << 24;
dc.col[defaultbg].color.alpha = (unsigned short)(0xffff * alpha);
dc.col[defaultbg].color.red =
((unsigned short)(dc.col[defaultbg].color.red * alpha)) & 0xff00;
dc.col[defaultbg].color.green =
((unsigned short)(dc.col[defaultbg].color.green * alpha)) & 0xff00;
dc.col[defaultbg].color.blue =
((unsigned short)(dc.col[defaultbg].color.blue * alpha)) & 0xff00;
dc.col[defaultbg].pixel &= 0x00FFFFFF;
dc.col[defaultbg].pixel |= (unsigned char)(0xff * alpha) << 24;
loaded = 1;
}