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avcodec/webp: add optimization: use local palette with extra padding

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for big enough pictures.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Pascal Massimino 2014-09-22 14:48:57 -07:00 committed by Michael Niedermayer
parent e81eca0ce5
commit 19fb476841
1 changed files with 25 additions and 9 deletions
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34
libavcodec/webp.c
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@ -1061,15 +1061,31 @@ static int apply_color_indexing_transform(WebPContext *s)
av_free(line);
}
for (y = 0; y < img->frame->height; y++) {
for (x = 0; x < img->frame->width; x++) {
p = GET_PIXEL(img->frame, x, y);
i = p[2];
if (i >= pal->frame->width) {
AV_WB32(p, 0x00000000);
} else {
const uint8_t *pi = GET_PIXEL(pal->frame, i, 0);
AV_COPY32(p, pi);
// switch to local palette if it's worth initializing it
if (img->frame->height * img->frame->width > 300) {
uint8_t palette[256 * 4];
const int size = pal->frame->width * 4;
memcpy(palette, GET_PIXEL(pal->frame, 0, 0), size); // copy palette
// set extra entries to transparent black
memset(palette + size, 0, 256 * 4 - size);
for (y = 0; y < img->frame->height; y++) {
for (x = 0; x < img->frame->width; x++) {
p = GET_PIXEL(img->frame, x, y);
i = p[2];
AV_COPY32(p, &palette[i * 4]);
}
}
} else {
for (y = 0; y < img->frame->height; y++) {
for (x = 0; x < img->frame->width; x++) {
p = GET_PIXEL(img->frame, x, y);
i = p[2];
if (i >= pal->frame->width) {
AV_WB32(p, 0x00000000);
} else {
const uint8_t *pi = GET_PIXEL(pal->frame, i, 0);
AV_COPY32(p, pi);
}
}
}
}