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swscale/alphablend: Support chroma subsampling

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Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
pull/150/head
Michael Niedermayer 10 years ago
parent c5ebeaa308
commit 0f9d46b70d
2 changed files with 62 additions and 15 deletions
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  1. 47
      libswscale/alphablend.c
  2. 30
      libswscale/utils.c

47
libswscale/alphablend.c
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@ -48,8 +48,54 @@ int ff_sws_alphablendaway(SwsContext *c, const uint8_t *src[],
if (desc->flags & AV_PIX_FMT_FLAG_PLANAR) {
for (plane = 0; plane < plane_count; plane++) {
int w = plane ? c->chrSrcW : c->srcW;
int x_subsample = plane ? desc->log2_chroma_w: 0;
int y_subsample = plane ? desc->log2_chroma_h: 0;
for (y = srcSliceY >> y_subsample; y < FF_CEIL_RSHIFT(srcSliceH, y_subsample); y++) {
if (x_subsample || y_subsample) {
int alpha;
unsigned u;
if (sixteen_bits) {
ptrdiff_t alpha_step = srcStride[plane_count] >> 1;
const uint16_t *s = src[plane ] + srcStride[plane] * y;
const uint16_t *a = src[plane_count] + (srcStride[plane_count] * y << y_subsample);
uint16_t *d = dst[plane ] + dstStride[plane] * y;
if ((!isBE(c->srcFormat)) == !HAVE_BIGENDIAN) {
for (x = 0; x < w; x++) {
if (y_subsample) {
alpha = (a[2*x] + a[2*x + 1] + 2 +
a[2*x + alpha_step] + a[2*x + alpha_step + 1]) >> 2;
} else
alpha = (a[2*x] + a[2*x + 1]) >> 1;
u = s[x]*alpha + target_table[((x^y)>>5)&1][plane]*(max-alpha) + off;
d[x] = av_clip((u + (u >> shift)) >> shift, 0, max);
}
} else {
for (x = 0; x < w; x++) {
if (y_subsample) {
alpha = (av_bswap16(a[2*x]) + av_bswap16(a[2*x + 1]) + 2 +
av_bswap16(a[2*x + alpha_step]) + av_bswap16(a[2*x + alpha_step + 1])) >> 2;
} else
alpha = (av_bswap16(a[2*x]) + av_bswap16(a[2*x + 1])) >> 1;
u = av_bswap16(s[x])*alpha + target_table[((x^y)>>5)&1][plane]*(max-alpha) + off;
d[x] = av_clip((u + (u >> shift)) >> shift, 0, max);
}
}
} else {
ptrdiff_t alpha_step = srcStride[plane_count];
const uint8_t *s = src[plane ] + srcStride[plane] * y;
const uint8_t *a = src[plane_count] + (srcStride[plane_count] * y << y_subsample);
uint8_t *d = dst[plane ] + dstStride[plane] * y;
for (x = 0; x < w; x++) {
if (y_subsample) {
alpha = (a[2*x] + a[2*x + 1] + 2 +
a[2*x + alpha_step] + a[2*x + alpha_step + 1]) >> 2;
} else
alpha = (a[2*x] + a[2*x + 1]) >> 1;
u = s[x]*alpha + target_table[((x^y)>>5)&1][plane]*(255-alpha) + 128;
d[x] = (257*u) >> 16;
}
}
} else {
if (sixteen_bits) {
const uint16_t *s = src[plane ] + srcStride[plane] * y;
const uint16_t *a = src[plane_count] + srcStride[plane_count] * y;
@ -77,6 +123,7 @@ int ff_sws_alphablendaway(SwsContext *c, const uint8_t *src[],
}
}
}
}
} else {
int alpha_pos = desc->comp[plane_count].offset_plus1 - 1;
int w = c->srcW;

30
libswscale/utils.c
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@ -987,9 +987,9 @@ static enum AVPixelFormat alphaless_fmt(enum AVPixelFormat fmt)
case AV_PIX_FMT_ABGR: return AV_PIX_FMT_BGR24;
case AV_PIX_FMT_BGRA: return AV_PIX_FMT_BGR24;
case AV_PIX_FMT_YA8: return AV_PIX_FMT_GRAY8;
//
// case AV_PIX_FMT_YUVA420P: return AV_PIX_FMT_YUV420P;
// case AV_PIX_FMT_YUVA422P: return AV_PIX_FMT_YUV422P;
case AV_PIX_FMT_YUVA420P: return AV_PIX_FMT_YUV420P;
case AV_PIX_FMT_YUVA422P: return AV_PIX_FMT_YUV422P;
case AV_PIX_FMT_YUVA444P: return AV_PIX_FMT_YUV444P;
case AV_PIX_FMT_GBRAP: return AV_PIX_FMT_GBRP;
@ -1005,23 +1005,23 @@ static enum AVPixelFormat alphaless_fmt(enum AVPixelFormat fmt)
case AV_PIX_FMT_YA16BE: return AV_PIX_FMT_GRAY16;
case AV_PIX_FMT_YA16LE: return AV_PIX_FMT_GRAY16;
// case AV_PIX_FMT_YUVA420P9BE: return AV_PIX_FMT_YUV420P9;
// case AV_PIX_FMT_YUVA422P9BE: return AV_PIX_FMT_YUV422P9;
case AV_PIX_FMT_YUVA420P9BE: return AV_PIX_FMT_YUV420P9;
case AV_PIX_FMT_YUVA422P9BE: return AV_PIX_FMT_YUV422P9;
case AV_PIX_FMT_YUVA444P9BE: return AV_PIX_FMT_YUV444P9;
// case AV_PIX_FMT_YUVA420P9LE: return AV_PIX_FMT_YUV420P9;
// case AV_PIX_FMT_YUVA422P9LE: return AV_PIX_FMT_YUV422P9;
case AV_PIX_FMT_YUVA420P9LE: return AV_PIX_FMT_YUV420P9;
case AV_PIX_FMT_YUVA422P9LE: return AV_PIX_FMT_YUV422P9;
case AV_PIX_FMT_YUVA444P9LE: return AV_PIX_FMT_YUV444P9;
// case AV_PIX_FMT_YUVA420P10BE: return AV_PIX_FMT_YUV420P10;
// case AV_PIX_FMT_YUVA422P10BE: return AV_PIX_FMT_YUV422P10;
case AV_PIX_FMT_YUVA420P10BE: return AV_PIX_FMT_YUV420P10;
case AV_PIX_FMT_YUVA422P10BE: return AV_PIX_FMT_YUV422P10;
case AV_PIX_FMT_YUVA444P10BE: return AV_PIX_FMT_YUV444P10;
// case AV_PIX_FMT_YUVA420P10LE: return AV_PIX_FMT_YUV420P10;
// case AV_PIX_FMT_YUVA422P10LE: return AV_PIX_FMT_YUV422P10;
case AV_PIX_FMT_YUVA420P10LE: return AV_PIX_FMT_YUV420P10;
case AV_PIX_FMT_YUVA422P10LE: return AV_PIX_FMT_YUV422P10;
case AV_PIX_FMT_YUVA444P10LE: return AV_PIX_FMT_YUV444P10;
// case AV_PIX_FMT_YUVA420P16BE: return AV_PIX_FMT_YUV420P16;
// case AV_PIX_FMT_YUVA422P16BE: return AV_PIX_FMT_YUV422P16;
case AV_PIX_FMT_YUVA420P16BE: return AV_PIX_FMT_YUV420P16;
case AV_PIX_FMT_YUVA422P16BE: return AV_PIX_FMT_YUV422P16;
case AV_PIX_FMT_YUVA444P16BE: return AV_PIX_FMT_YUV444P16;
// case AV_PIX_FMT_YUVA420P16LE: return AV_PIX_FMT_YUV420P16;
// case AV_PIX_FMT_YUVA422P16LE: return AV_PIX_FMT_YUV422P16;
case AV_PIX_FMT_YUVA420P16LE: return AV_PIX_FMT_YUV420P16;
case AV_PIX_FMT_YUVA422P16LE: return AV_PIX_FMT_YUV422P16;
case AV_PIX_FMT_YUVA444P16LE: return AV_PIX_FMT_YUV444P16;
// case AV_PIX_FMT_AYUV64LE:

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