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swscale/output: Correct Alpha in yuv2ya16_X_c_template()

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Untested, no testcase

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-09-26 17:13:16 +02:00
parent 4f4ca675e5
commit 3e6682931b
1 changed files with 3 additions and 2 deletions
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5
libswscale/output.c
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@ -905,7 +905,7 @@ yuv2ya16_X_c_template(SwsContext *c, const int16_t *lumFilter,
for (i = 0; i < dstW; i++) {
int j;
int Y = -0x40000000;
int64_t A = 0xffff<<14;
int64_t A = 0xffff;
for (j = 0; j < lumFilterSize; j++)
Y += lumSrc[j][i] * lumFilter[j];
@ -915,6 +915,7 @@ yuv2ya16_X_c_template(SwsContext *c, const int16_t *lumFilter,
Y = av_clip_uint16(Y);
if (hasAlpha) {
A = 1<<14;
for (j = 0; j < lumFilterSize; j++)
A += alpSrc[j][i] * lumFilter[j];
@ -923,7 +924,7 @@ yuv2ya16_X_c_template(SwsContext *c, const int16_t *lumFilter,
}
output_pixel(&dest[2 * i ], Y);
output_pixel(&dest[2 * i + 1], hasAlpha ? A : 65535);
output_pixel(&dest[2 * i + 1], A);
}
}