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sws: factor out gamma-correct scaling

This commit is contained in:
Anton Khirnov 2021-05-19 10:12:15 +02:00
parent e355af9be9
commit 44f12718bf
1 changed files with 30 additions and 23 deletions
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53
libswscale/swscale.c
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@ -811,6 +811,34 @@ static void update_palette(SwsContext *c, const uint32_t *pal)
}
}
static int scale_gamma(SwsContext *c,
const uint8_t * const srcSlice[], const int srcStride[],
int srcSliceY, int srcSliceH,
uint8_t * const dst[], const int dstStride[])
{
int ret = sws_scale(c->cascaded_context[0],
srcSlice, srcStride, srcSliceY, srcSliceH,
c->cascaded_tmp, c->cascaded_tmpStride);
if (ret < 0)
return ret;
if (c->cascaded_context[2])
ret = sws_scale(c->cascaded_context[1], (const uint8_t * const *)c->cascaded_tmp, c->cascaded_tmpStride, srcSliceY, srcSliceH, c->cascaded1_tmp, c->cascaded1_tmpStride);
else
ret = sws_scale(c->cascaded_context[1], (const uint8_t * const *)c->cascaded_tmp, c->cascaded_tmpStride, srcSliceY, srcSliceH, dst, dstStride);
if (ret < 0)
return ret;
if (c->cascaded_context[2]) {
ret = sws_scale(c->cascaded_context[2],
(const uint8_t * const *)c->cascaded1_tmp, c->cascaded1_tmpStride, c->cascaded_context[1]->dstY - ret, c->cascaded_context[1]->dstY,
dst, dstStride);
}
return ret;
}
/**
* swscale wrapper, so we don't need to export the SwsContext.
* Assumes planar YUV to be in YUV order instead of YVU.
@ -848,29 +876,8 @@ int attribute_align_arg sws_scale(struct SwsContext *c,
return AVERROR(EINVAL);
}
if (c->gamma_flag && c->cascaded_context[0]) {
ret = sws_scale(c->cascaded_context[0],
srcSlice, srcStride, srcSliceY, srcSliceH,
c->cascaded_tmp, c->cascaded_tmpStride);
if (ret < 0)
return ret;
if (c->cascaded_context[2])
ret = sws_scale(c->cascaded_context[1], (const uint8_t * const *)c->cascaded_tmp, c->cascaded_tmpStride, srcSliceY, srcSliceH, c->cascaded1_tmp, c->cascaded1_tmpStride);
else
ret = sws_scale(c->cascaded_context[1], (const uint8_t * const *)c->cascaded_tmp, c->cascaded_tmpStride, srcSliceY, srcSliceH, dst, dstStride);
if (ret < 0)
return ret;
if (c->cascaded_context[2]) {
ret = sws_scale(c->cascaded_context[2],
(const uint8_t * const *)c->cascaded1_tmp, c->cascaded1_tmpStride, c->cascaded_context[1]->dstY - ret, c->cascaded_context[1]->dstY,
dst, dstStride);
}
return ret;
}
if (c->gamma_flag && c->cascaded_context[0])
return scale_gamma(c, srcSlice, srcStride, srcSliceY, srcSliceH, dst, dstStride);
if (c->cascaded_context[0] && srcSliceY == 0 && srcSliceH == c->cascaded_context[0]->srcH) {
ret = sws_scale(c->cascaded_context[0],