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Add no-color cache configuration to the cruncher

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Fix another pessimization found by the pingo image compressor.

Refactoring is necessary to make LZ77 computation
common to cache or no-cache analysis.
Slower by 1.7x instead of 2x

Change-Id: I396701ea6e88543dbfe9471eb552877f6c8ce1e3
This commit is contained in:
Vincent Rabaud
2020-06-09 18:53:56 +02:00
parent 749a8b99f7
commit f0110baec0
5 changed files with 300 additions and 215 deletions
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20
src/enc/backward_references_enc.h
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@ -16,6 +16,7 @@
#include <assert.h>
#include <stdlib.h>
#include "src/webp/types.h"
#include "src/webp/encode.h"
#include "src/webp/format_constants.h"
#ifdef __cplusplus
@ -218,14 +219,19 @@ enum VP8LLZ77Type {
// Evaluates best possible backward references for specified quality.
// The input cache_bits to 'VP8LGetBackwardReferences' sets the maximum cache
// bits to use (passing 0 implies disabling the local color cache).
// The optimal cache bits is evaluated and set for the *cache_bits parameter.
// The return value is the pointer to the best of the two backward refs viz,
// refs[0] or refs[1].
VP8LBackwardRefs* VP8LGetBackwardReferences(
// The optimal cache bits is evaluated and set for the *cache_bits_best
// parameter with the matching refs_best.
// If do_no_cache == 0, refs is an array of 2 values and the best
// VP8LBackwardRefs is put in the first element.
// If do_no_cache != 0, refs is an array of 3 values and the best
// VP8LBackwardRefs is put in the first element, the best value with no-cache in
// the second element.
// In both cases, the last element is used as temporary internally.
WebPEncodingError VP8LGetBackwardReferences(
int width, int height, const uint32_t* const argb, int quality,
int low_effort, int lz77_types_to_try, int* const cache_bits,
const VP8LHashChain* const hash_chain, VP8LBackwardRefs* const refs_tmp1,
VP8LBackwardRefs* const refs_tmp2);
int low_effort, int lz77_types_to_try, int cache_bits_max, int do_no_cache,
const VP8LHashChain* const hash_chain, VP8LBackwardRefs* const refs,
int* const cache_bits_best);
#ifdef __cplusplus
}