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sixel: apply background alpha when P2=0 or P2=2, and current bg color is the default bg color

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Closes #1360
This commit is contained in:
Daniel Eklöf 2023-05-31 16:27:48 +02:00
parent b4e418f251
commit 1433a81c08
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GPG key ID: 5BBD4992C116573F
2 changed files with 24 additions and 4 deletions
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22
sixel.c
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@ -73,22 +73,36 @@ sixel_init(struct terminal *term, int p1, int p2, int p3)
switch (term->vt.attrs.bg_src) {
case COLOR_RGB:
bg = term->vt.attrs.bg;
bg = 0xffu << 24 | term->vt.attrs.bg;
break;
case COLOR_BASE16:
case COLOR_BASE256:
bg = term->colors.table[term->vt.attrs.bg];
bg = 0xffu << 24 | term->colors.table[term->vt.attrs.bg];
break;
case COLOR_DEFAULT:
bg = term->colors.bg;
if (term->colors.alpha == 0xffff)
bg = 0xffu << 24 | term->colors.bg;
else {
/* Alpha needs to be pre-multiplied */
uint32_t r = (term->colors.bg >> 16) & 0xff;
uint32_t g = (term->colors.bg >> 8) & 0xff;
uint32_t b = (term->colors.bg >> 0) & 0xff;
uint32_t alpha = term->colors.alpha;
r *= alpha; r /= 0xffff;
g *= alpha; g /= 0xffff;
b *= alpha; b /= 0xffff;
bg = (alpha >> 8) << 24 | (r & 0xff) << 16 | (g & 0xff) << 8 | (b & 0xff);
}
break;
}
term->sixel.default_bg = term->sixel.transparent_bg
? 0x00000000u
: 0xffu << 24 | bg;
: bg;
for (size_t i = 0; i < 1 * 6; i++)
term->sixel.image.data[i] = term->sixel.default_bg;