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swscale/swscale_unscaled: fix packed30togbra10() for formats with bpc between 9-14 bits

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Currently, packed30togbra10() always sets the alpha value to 0xFFFF,
without taking the bit depth into consideration.

This commit restricts the alpha value to the bit depth.
This commit is contained in:
Ramiro Polla
2025-05-18 22:52:08 +02:00
parent a16c053a33
commit 0c1d87d1e6
1 changed files with 3 additions and 2 deletions
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5
libswscale/swscale_unscaled.c
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@ -818,6 +818,7 @@ static void packed30togbra10(const uint8_t *src, int srcStride,
int x, h, i; int x, h, i;
int dst_alpha = dst[3] != NULL; int dst_alpha = dst[3] != NULL;
int scale_high = bpc - 10, scale_low = 10 - scale_high; int scale_high = bpc - 10, scale_low = 10 - scale_high;
uint16_t alpha_val = (1U << bpc) - 1;
for (h = 0; h < srcSliceH; h++) { for (h = 0; h < srcSliceH; h++) {
uint32_t *src_line = (uint32_t *)(src + srcStride * h); uint32_t *src_line = (uint32_t *)(src + srcStride * h);
unsigned component; unsigned component;
@ -834,7 +835,7 @@ static void packed30togbra10(const uint8_t *src, int srcStride,
dst[1][x] = av_bswap16(component << scale_high | component >> scale_low); dst[1][x] = av_bswap16(component << scale_high | component >> scale_low);
component = p & 0x3FF; component = p & 0x3FF;
dst[2][x] = av_bswap16(component << scale_high | component >> scale_low); dst[2][x] = av_bswap16(component << scale_high | component >> scale_low);
dst[3][x] = 0xFFFF; dst[3][x] = av_bswap16(alpha_val);
src_line++; src_line++;
} }
} else { } else {
@ -860,7 +861,7 @@ static void packed30togbra10(const uint8_t *src, int srcStride,
dst[1][x] = component << scale_high | component >> scale_low; dst[1][x] = component << scale_high | component >> scale_low;
component = p & 0x3FF; component = p & 0x3FF;
dst[2][x] = component << scale_high | component >> scale_low; dst[2][x] = component << scale_high | component >> scale_low;
dst[3][x] = 0xFFFF; dst[3][x] = alpha_val;
src_line++; src_line++;
} }
} else { } else {