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Do not use a palette for one color images.

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1 color images now always take 30 bytes.

Change-Id: Ifa86bc5320362c659672b3836160353d63576467
This commit is contained in:
Vincent Rabaud
2021-04-28 13:14:28 +02:00
parent 98bbe35b51
commit b6513fbaa8
3 changed files with 39 additions and 1 deletions
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22
src/enc/backward_references_enc.c
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@ -550,6 +550,25 @@ static int BackwardReferencesLz77(int xsize, int ysize,
return ok;
}
static int BackwardReferencesNone(int xsize, int ysize,
const uint32_t* const argb, int cache_bits,
VP8LBackwardRefs* const refs) {
const int pix_count = xsize * ysize;
int i;
const int use_color_cache = (cache_bits > 0);
VP8LColorCache hashers;
if (use_color_cache && !VP8LColorCacheInit(&hashers, cache_bits)) {
return 0;
}
VP8LClearBackwardRefs(refs);
for (i = 0; i < pix_count; ++i) {
AddSingleLiteral(argb[i], use_color_cache, &hashers, refs);
}
if (use_color_cache) VP8LColorCacheClear(&hashers);
return !refs->error_;
}
// Compute an LZ77 by forcing matches to happen within a given distance cost.
// We therefore limit the algorithm to the lowest 32 values in the PlaneCode
// definition.
@ -919,6 +938,9 @@ static int GetBackwardReferences(int width, int height,
res = BackwardReferencesLz77Box(width, height, argb, 0, hash_chain,
&hash_chain_box, refs_tmp);
break;
case kLZ77None:
res = BackwardReferencesNone(width, height, argb, 0, refs_tmp);
break;
default:
assert(0);
}