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nitpicker: avoid color bleeding 

This patch improves the output of opaque pixels in the presence of an
alpha channel by adding a special case for the maximum alpha value.

Fixes #2831
This commit is contained in:
Norman Feske 2019-01-03 15:13:40 +01:00
parent 97bfc13237
commit 76e96e92cb
1 changed files with 6 additions and 4 deletions
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10
repos/os/include/nitpicker_gfx/texture_painter.h
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@ -98,13 +98,15 @@ struct Texture_painter
* Copy texture with alpha blending
*/
for (j = clipped.h(); j--; src += src_w, alpha += src_w, dst += dst_w)
for (i = clipped.w(), s = src, a = alpha, d = dst; i--; s++, d++, a++)
if (*a)
*d = PT::mix(*d, *s, *a);
for (i = clipped.w(), s = src, a = alpha, d = dst; i--; s++, d++, a++) {
unsigned char const alpha_value = *a;
if (__builtin_expect(alpha_value != 0, true))
*d = PT::mix(*d, *s, alpha_value + 1);
}
break;
case MIXED:
for (j = clipped.h(); j--; src += src_w, dst += dst_w)
for (i = clipped.w(), s = src, d = dst; i--; s++, d++)
*d = PT::avr(mix_pixel, *s);