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author | Michael Niedermayer <michael@niedermayer.cc> | 2015-08-09 17:09:30 +0300 |
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committer | Michael Niedermayer <michael@niedermayer.cc> | 2015-08-09 17:09:30 +0300 |
commit | 87100e828a59fa04dc892b45d8db2d690ce6a2a1 (patch) | |
tree | 1bf6ff8808ccdeb5b47af12031f3c2179f2c06ca | |
parent | f28ba31b1b181d5db1aec1e5b9e23ddbadb365d3 (diff) |
swscale/alphablend: Factor target computation out of the loops
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
-rw-r--r-- | libswscale/alphablend.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/libswscale/alphablend.c b/libswscale/alphablend.c index 7127d6c18b..7c9fe6f372 100644 --- a/libswscale/alphablend.c +++ b/libswscale/alphablend.c @@ -32,6 +32,10 @@ int ff_sws_alphablendaway(SwsContext *c, const uint8_t *src[], unsigned off = 1<<desc->comp[0].depth_minus1; unsigned shift = desc->comp[0].depth_minus1 + 1; unsigned max = (1<<shift) - 1; + int target_table[3]; + + for (plane = 0; plane < plane_count; plane++) + target_table[plane] = plane && !(desc->flags & AV_PIX_FMT_FLAG_RGB) ? 1<<desc->comp[0].depth_minus1 : 0; av_assert0(plane_count == nb_components - 1); if (desc->flags & AV_PIX_FMT_FLAG_PLANAR) { @@ -43,7 +47,7 @@ int ff_sws_alphablendaway(SwsContext *c, const uint8_t *src[], const uint16_t *s = src[plane ] + srcStride[plane] * y; const uint16_t *a = src[plane_count] + srcStride[plane_count] * y; uint16_t *d = dst[plane ] + dstStride[plane] * y; - unsigned target = plane && !(desc->flags & AV_PIX_FMT_FLAG_RGB) ? 1<<desc->comp[0].depth_minus1 : 0; + unsigned target = target_table[plane]; if ((!isBE(c->srcFormat)) == !HAVE_BIGENDIAN) { for (x = 0; x < w; x++) { unsigned u = s[x]*a[x] + target*(max-a[x]) + off; @@ -60,7 +64,7 @@ int ff_sws_alphablendaway(SwsContext *c, const uint8_t *src[], const uint8_t *s = src[plane ] + srcStride[plane] * y; const uint8_t *a = src[plane_count] + srcStride[plane_count] * y; uint8_t *d = dst[plane ] + dstStride[plane] * y; - unsigned target = plane && !(desc->flags & AV_PIX_FMT_FLAG_RGB) ? 128 : 0; + unsigned target = target_table[plane]; for (x = 0; x < w; x++) { unsigned u = s[x]*a[x] + target*(255-a[x]) + 128; d[x] = (257*u) >> 16; @@ -79,19 +83,17 @@ int ff_sws_alphablendaway(SwsContext *c, const uint8_t *src[], if ((!isBE(c->srcFormat)) == !HAVE_BIGENDIAN) { for (x = 0; x < w; x++) { for (plane = 0; plane < plane_count; plane++) { - unsigned target = plane && !(desc->flags & AV_PIX_FMT_FLAG_RGB) ? 1<<desc->comp[0].depth_minus1 : 0; int x_index = (plane_count + 1) * x; - unsigned u = s[x_index + plane]*a[x_index] + target*(max-a[x_index]) + off; + unsigned u = s[x_index + plane]*a[x_index] + target_table[plane]*(max-a[x_index]) + off; d[plane_count*x + plane] = av_clip((u + (u >> shift)) >> shift, 0, max); } } } else { for (x = 0; x < w; x++) { for (plane = 0; plane < plane_count; plane++) { - unsigned target = plane && !(desc->flags & AV_PIX_FMT_FLAG_RGB) ? 1<<desc->comp[0].depth_minus1 : 0; int x_index = (plane_count + 1) * x; unsigned aswap =av_bswap16(a[x_index]); - unsigned u = av_bswap16(s[x_index + plane])*aswap + target*(max-aswap) + off; + unsigned u = av_bswap16(s[x_index + plane])*aswap + target_table[plane]*(max-aswap) + off; d[plane_count*x + plane] = av_clip((u + (u >> shift)) >> shift, 0, max); } } @@ -102,9 +104,8 @@ int ff_sws_alphablendaway(SwsContext *c, const uint8_t *src[], uint8_t *d = dst[0] + dstStride[0] * y; for (x = 0; x < w; x++) { for (plane = 0; plane < plane_count; plane++) { - unsigned target = plane && !(desc->flags & AV_PIX_FMT_FLAG_RGB) ? 128 : 0; int x_index = (plane_count + 1) * x; - unsigned u = s[x_index + plane]*a[x_index] + target*(255-a[x_index]) + 128; + unsigned u = s[x_index + plane]*a[x_index] + target_table[plane]*(255-a[x_index]) + 128; d[plane_count*x + plane] = (257*u) >> 16; } } |