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Revert "Do not use a palette for one color images."
This reverts commit b6513fbaa8
.
This change can produce files that can cause decode failures in some
versions of chrome and safari/ios/macos.
https://chromium-review.googlesource.com/c/chromium/src/+/2876279
The chrome fix will be available in M92. This change can be revisited
after it and the mac updates are more widely deployed.
Bug: b/186640109,b/188702956
Change-Id: I296b8fe88c6c48219e3edf532226c4f972f1605b
This commit is contained in:
@ -550,25 +550,6 @@ static int BackwardReferencesLz77(int xsize, int ysize,
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return ok;
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}
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static int BackwardReferencesNone(int xsize, int ysize,
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const uint32_t* const argb, int cache_bits,
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VP8LBackwardRefs* const refs) {
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const int pix_count = xsize * ysize;
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int i;
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const int use_color_cache = (cache_bits > 0);
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VP8LColorCache hashers;
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if (use_color_cache && !VP8LColorCacheInit(&hashers, cache_bits)) {
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return 0;
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}
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VP8LClearBackwardRefs(refs);
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for (i = 0; i < pix_count; ++i) {
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AddSingleLiteral(argb[i], use_color_cache, &hashers, refs);
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}
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if (use_color_cache) VP8LColorCacheClear(&hashers);
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return !refs->error_;
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}
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// Compute an LZ77 by forcing matches to happen within a given distance cost.
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// We therefore limit the algorithm to the lowest 32 values in the PlaneCode
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// definition.
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@ -938,9 +919,6 @@ static int GetBackwardReferences(int width, int height,
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res = BackwardReferencesLz77Box(width, height, argb, 0, hash_chain,
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&hash_chain_box, refs_tmp);
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break;
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case kLZ77None:
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res = BackwardReferencesNone(width, height, argb, 0, refs_tmp);
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break;
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default:
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assert(0);
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}
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