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swscale/alphablend: Factor target computation out of the loops

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Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
pull/150/head
Michael Niedermayer 9 years ago
parent f28ba31b1b
commit 87100e828a
1 changed files with 9 additions and 8 deletions
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  1. 17
      libswscale/alphablend.c

17
libswscale/alphablend.c
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@ -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;
}
}

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