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add utils/color_cache.[hc] from experimental

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Pulled from the current HEAD (218c32e).
The history of this and related files is a bit entangled so rather
trying to split the changes and introduce some noise in master's history
we'll start with a fresh snapshot.
The file progression is still available in the experimental branch.

Change-Id: Id879be453a94d9f44ec8d47747823ca7297ae008
This commit is contained in:
James Zern
2012-04-10 17:23:38 -07:00
parent b3bf8fe7a1
commit 337914a036
2 changed files with 113 additions and 0 deletions
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45
src/utils/color_cache.c Normal file
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// Copyright 2012 Google Inc. All Rights Reserved.
//
// This code is licensed under the same terms as WebM:
// Software License Agreement: http://www.webmproject.org/license/software/
// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
// -----------------------------------------------------------------------------
//
// Color Cache for WebP Lossless
//
// Author: jyrki@google.com (Jyrki Alakuijala)
#include <assert.h>
#include <stdlib.h>
#include "./color_cache.h"
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
//------------------------------------------------------------------------------
// VP8LColorCache.
int VP8LColorCacheInit(VP8LColorCache* const cc, int hash_bits) {
int hash_size;
assert(cc != NULL);
if (hash_bits == 0) hash_bits = 1;
hash_size = 1 << hash_bits;
cc->colors_ = (uint32_t*)calloc(hash_size, sizeof(*cc->colors_));
if (cc->colors_ == NULL) return 0;
cc->hash_shift_ = 32 - hash_bits;
return 1;
}
void VP8LColorCacheDelete(VP8LColorCache* const cc) {
if (cc != NULL) {
free(cc->colors_);
free(cc);
}
}
#if defined(__cplusplus) || defined(c_plusplus)
}
#endif