X-Git-Url: https://git.piment-noir.org/?p=deb_ffmpeg.git;a=blobdiff_plain;f=ffmpeg%2Flibavcodec%2Fwebp.c;h=4b1c8e7f8b0e80a67523f1adf78fdf739224d951;hp=274708df793456f15a471e27c2b96de5fb38edd3;hb=f6fa7814ccfe3e76514b36cf04f5cd3cb657c8cf;hpb=2ba45a602cbfa7b771effba9b11bb4245c21bc00

diff --git a/ffmpeg/libavcodec/webp.c b/ffmpeg/libavcodec/webp.c
index 274708d..4b1c8e7 100644
--- a/ffmpeg/libavcodec/webp.c
+++ b/ffmpeg/libavcodec/webp.c
@@ -1061,15 +1061,32 @@ 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;
+        av_assert0(size <= 1024U);
+        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);
+                }
             }
         }
     }