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avfilter/vf_premultiply : fix unpremultiply_offset for rgb input

This commit is contained in:
Martin Vignali 2018-03-17 22:20:34 +01:00
parent b2bb1cb68b
commit 3e7fa34d3b
1 changed files with 2 additions and 2 deletions
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4
libavfilter/vf_premultiply.c
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@ -272,7 +272,7 @@ static void unpremultiply8offset(const uint8_t *msrc, const uint8_t *asrc,
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
if (asrc[x] > 0 && asrc[x] < 255)
dst[x] = FFMIN((msrc[x] - offset) * 255 / asrc[x] + offset, 255);
dst[x] = FFMIN(FFMAX(msrc[x] - offset, 0) * 255 / asrc[x] + offset, 255);
else
dst[x] = msrc[x];
}
@ -350,7 +350,7 @@ static void unpremultiply16offset(const uint8_t *mmsrc, const uint8_t *aasrc,
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
if (asrc[x] > 0 && asrc[x] < max)
dst[x] = FFMAX(FFMIN((msrc[x] - offset) * (unsigned)max / asrc[x] + offset, max), 0);
dst[x] = FFMAX(FFMIN(FFMAX(msrc[x] - offset, 0) * (unsigned)max / asrc[x] + offset, max), 0);
else
dst[x] = msrc[x];
}