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Add Alpha Decode support from WebPDecode.

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Extend WebP decode functionality to extract Alpha data (support ALPH
chunk) and decode the Alpha plane using Alpha (utils/alpha) core-lib.

Change-Id: I6f0ee1b189c13caba3c1dd9b681383bfd00aa212
This commit is contained in:
Vikas Arora
2011-12-01 08:57:36 +05:30
parent e1947a9299
commit d117a94046
8 changed files with 62 additions and 77 deletions
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5
src/dec/io.c
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@ -163,7 +163,6 @@ static int EmitFancyRGB(const VP8Io* const io, WebPDecParams* const p) {
//------------------------------------------------------------------------------
#ifdef WEBP_EXPERIMENTAL_FEATURES
static int EmitAlphaYUV(const VP8Io* const io, WebPDecParams* const p) {
const int mb_w = io->mb_w;
const int mb_h = io->mb_h;
@ -200,8 +199,6 @@ static int EmitAlphaRGB(const VP8Io* const io, WebPDecParams* const p) {
return 0;
}
#endif /* WEBP_EXPERIMENTAL_FEATURES */
//------------------------------------------------------------------------------
// Simple picture rescaler
@ -609,12 +606,10 @@ static int CustomSetup(VP8Io* io) {
} else {
p->emit = EmitYUV;
}
#ifdef WEBP_EXPERIMENTAL_FEATURES
if (IsAlphaMode(p->output->colorspace)) {
// We need transparency output
p->emit_alpha = is_rgb ? EmitAlphaRGB : EmitAlphaYUV;
}
#endif
}
if (is_rgb) {