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Add WebPReplaceTransparentPixels() in dsp

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with SSE2 implementation.

(Extracted from side experiment)

Change-Id: I62d457fb6643645291cffd6d2d205d4a5ffa4517
This commit is contained in:
Skal
2020-09-05 11:44:59 +02:00
parent 84739717d6
commit 55a080e50a
6 changed files with 49 additions and 22 deletions
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31
src/enc/picture_tools_enc.c
View File

@ -83,6 +83,19 @@ static int SmoothenBlock(const uint8_t* a_ptr, int a_stride, uint8_t* y_ptr,
return (count == 0);
}
void WebPReplaceTransparentPixels(WebPPicture* pic, uint32_t color) {
if (pic != NULL && pic->use_argb) {
int y = pic->height;
uint32_t* argb = pic->argb;
color &= 0xffffffu; // force alpha=0
WebPInitAlphaProcessing();
while (y-- > 0) {
WebPAlphaReplace(argb, pic->width, color);
argb += pic->argb_stride;
}
}
}
void WebPCleanupTransparentArea(WebPPicture* pic) {
int x, y, w, h;
if (pic == NULL) return;
@ -165,24 +178,6 @@ void WebPCleanupTransparentArea(WebPPicture* pic) {
#undef SIZE
#undef SIZE2
void WebPCleanupTransparentAreaLossless(WebPPicture* const pic) {
int x, y, w, h;
uint32_t* argb;
assert(pic != NULL && pic->use_argb);
w = pic->width;
h = pic->height;
argb = pic->argb;
for (y = 0; y < h; ++y) {
for (x = 0; x < w; ++x) {
if ((argb[x] & 0xff000000) == 0) {
argb[x] = 0x00000000;
}
}
argb += pic->argb_stride;
}
}
//------------------------------------------------------------------------------
// Blend color and remove transparency info

6
src/enc/vp8i_enc.h
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@ -505,9 +505,9 @@ int WebPPictureAllocARGB(WebPPicture* const picture, int width, int height);
// Returns false in case of error (invalid param, out-of-memory).
int WebPPictureAllocYUVA(WebPPicture* const picture, int width, int height);
// Clean-up the RGB samples under fully transparent area, to help lossless
// compressibility (no guarantee, though). Assumes that pic->use_argb is true.
void WebPCleanupTransparentAreaLossless(WebPPicture* const pic);
// Replace samples that are fully transparent by 'color' to help compressibility
// (no guarantee, though). Assumes pic->use_argb is true.
void WebPReplaceTransparentPixels(WebPPicture* const pic, uint32_t color);
//------------------------------------------------------------------------------

2
src/enc/webp_enc.c
View File

@ -400,7 +400,7 @@ int WebPEncode(const WebPConfig* config, WebPPicture* pic) {
}
if (!config->exact) {
WebPCleanupTransparentAreaLossless(pic);
WebPReplaceTransparentPixels(pic, 0x000000);
}
ok = VP8LEncodeImage(config, pic); // Sets pic->error in case of problem.