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sd_lavc: fix some obscure UB

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UB-sanitizer complains that we shift bits into the sign (when a is
used). Change it to unsigned, which in theory is more correct and
silences the warning.

Doesn't matter in practice, both the "bug" and the fix have 0 impact.
This commit is contained in:
wm4 2019-01-20 17:29:33 +01:00
parent 5901c3ae0d
commit 075111c4d2
1 changed files with 4 additions and 4 deletions
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8
sub/sd_lavc.c
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@ -147,10 +147,10 @@ static void convert_pal(uint32_t *colors, size_t count, bool gray)
{
for (int n = 0; n < count; n++) {
uint32_t c = colors[n];
int b = c & 0xFF;
int g = (c >> 8) & 0xFF;
int r = (c >> 16) & 0xFF;
int a = (c >> 24) & 0xFF;
uint32_t b = c & 0xFF;
uint32_t g = (c >> 8) & 0xFF;
uint32_t r = (c >> 16) & 0xFF;
uint32_t a = (c >> 24) & 0xFF;
if (gray)
r = g = b = (r + g + b) / 3;
// from straight to pre-multiplied alpha