virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2025-08-10 06:10:52 +02:00
Code Issues Releases Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

34
libavcodec/webp.c
View File

@@ -1061,15 +1061,31 @@ static int apply_color_indexing_transform(WebPContext *s)
av_free(line); av_free(line);
} }
for (y = 0; y < img->frame->height; y++) { // switch to local palette if it's worth initializing it
for (x = 0; x < img->frame->width; x++) { if (img->frame->height * img->frame->width > 300) {
p = GET_PIXEL(img->frame, x, y); uint8_t palette[256 * 4];
i = p[2]; const int size = pal->frame->width * 4;
if (i >= pal->frame->width) { memcpy(palette, GET_PIXEL(pal->frame, 0, 0), size); // copy palette
AV_WB32(p, 0x00000000); // set extra entries to transparent black
} else { memset(palette + size, 0, 256 * 4 - size);
const uint8_t *pi = GET_PIXEL(pal->frame, i, 0); for (y = 0; y < img->frame->height; y++) {
AV_COPY32(p, pi); 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);
}
} }
} }
} }