color_cache.c revision 5821806d5e7f356e8fa4b058a389a808ea183019 
1// Copyright 2012 Google Inc. All Rights Reserved.
2//
3// This code is licensed under the same terms as WebM:
4//  Software License Agreement:  http://www.webmproject.org/license/software/
5//  Additional IP Rights Grant:  http://www.webmproject.org/license/additional/
6// -----------------------------------------------------------------------------
7//
8// Color Cache for WebP Lossless
9//
10// Author: Jyrki Alakuijala (jyrki@google.com)
11
12#include <assert.h>
13#include <stdlib.h>
14#include "./color_cache.h"
15#include "../utils/utils.h"
16
17#if defined(__cplusplus) || defined(c_plusplus)
18extern "C" {
19#endif
20
21//------------------------------------------------------------------------------
22// VP8LColorCache.
23
24int VP8LColorCacheInit(VP8LColorCache* const cc, int hash_bits) {
25  const int hash_size = 1 << hash_bits;
26  assert(cc != NULL);
27  assert(hash_bits > 0);
28  cc->colors_ = (uint32_t*)WebPSafeCalloc((uint64_t)hash_size,
29                                          sizeof(*cc->colors_));
30  if (cc->colors_ == NULL) return 0;
31  cc->hash_shift_ = 32 - hash_bits;
32  return 1;
33}
34
35void VP8LColorCacheClear(VP8LColorCache* const cc) {
36  if (cc != NULL) {
37    free(cc->colors_);
38    cc->colors_ = NULL;
39  }
40}
41
42#if defined(__cplusplus) || defined(c_plusplus)
43}
44#endif
45