AVFrame *last_frame;
int flags;
int image;
+ int use_global_palette;
uint32_t palette[AVPALETTE_COUNT]; ///< local reference palette for !pal8
int palette_loaded;
int transparent_index;
bcid = get_palette_transparency_index(global_palette);
- bytestream_put_byte(bytestream, 0xf7); /* flags: global clut, 256 entries */
+ bytestream_put_byte(bytestream, ((uint8_t) s->use_global_palette << 7) | 0x70 | (s->use_global_palette ? 7 : 0)); /* flags: global clut, 256 entries */
bytestream_put_byte(bytestream, bcid < 0 ? DEFAULT_TRANSPARENCY_INDEX : bcid); /* background color index */
bytestream_put_byte(bytestream, aspect);
- for (int i = 0; i < 256; i++) {
- const uint32_t v = global_palette[i] & 0xffffff;
- bytestream_put_be24(bytestream, v);
+ if (s->use_global_palette) {
+ for (int i = 0; i < 256; i++) {
+ const uint32_t v = global_palette[i] & 0xffffff;
+ bytestream_put_be24(bytestream, v);
+ }
}
}
bytestream_put_le16(bytestream, width);
bytestream_put_le16(bytestream, height);
- if (!palette) {
- bytestream_put_byte(bytestream, 0x00); /* flags */
- } else {
+ if (palette || !s->use_global_palette) {
+ const uint32_t *pal = palette ? palette : s->palette;
unsigned i;
bytestream_put_byte(bytestream, 1<<7 | 0x7); /* flags */
for (i = 0; i < AVPALETTE_COUNT; i++) {
- const uint32_t v = palette[i];
+ const uint32_t v = pal[i];
bytestream_put_be24(bytestream, v);
}
+ } else {
+ bytestream_put_byte(bytestream, 0x00); /* flags */
}
bytestream_put_byte(bytestream, 0x08);
{ "offsetting", "enable picture offsetting", 0, AV_OPT_TYPE_CONST, {.i64=GF_OFFSETTING}, INT_MIN, INT_MAX, FLAGS, "flags" },
{ "transdiff", "enable transparency detection between frames", 0, AV_OPT_TYPE_CONST, {.i64=GF_TRANSDIFF}, INT_MIN, INT_MAX, FLAGS, "flags" },
{ "gifimage", "enable encoding only images per frame", OFFSET(image), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
+ { "global_palette", "write a palette to the global gif header where feasible", OFFSET(use_global_palette), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
{ NULL }
};