Premultiply background RGB values if alpha is used
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d06bf1fd7e
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1 changed files with 9 additions and 3 deletions
6
x.c
6
x.c
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@ -785,6 +785,12 @@ xloadcols(void)
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if (opt_alpha)
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alpha = strtof(opt_alpha, NULL);
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dc.col[defaultbg].color.alpha = (unsigned short)(0xffff * alpha);
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dc.col[defaultbg].color.red =
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((unsigned short)(dc.col[defaultbg].color.red * alpha)) & 0xff00;
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dc.col[defaultbg].color.green =
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((unsigned short)(dc.col[defaultbg].color.green * alpha)) & 0xff00;
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dc.col[defaultbg].color.blue =
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((unsigned short)(dc.col[defaultbg].color.blue * alpha)) & 0xff00;
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dc.col[defaultbg].pixel &= 0x00FFFFFF;
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dc.col[defaultbg].pixel |= (unsigned char)(0xff * alpha) << 24;
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loaded = 1;
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