1 // Copyright 2012 Google Inc. All Rights Reserved.
2 //
3 // Use of this source code is governed by a BSD-style license
4 // that can be found in the COPYING file in the root of the source
5 // tree. An additional intellectual property rights grant can be found
6 // in the file PATENTS. All contributing project authors may
7 // be found in the AUTHORS file in the root of the source tree.
8 // -----------------------------------------------------------------------------
9 //
10 // Color Cache for WebP Lossless
11 //
12 // Author: Jyrki Alakuijala (jyrki@google.com)
13 
14 #include <assert.h>
15 #include <stdlib.h>
16 #include "./color_cache.h"
17 #include "../utils/utils.h"
18 
19 //------------------------------------------------------------------------------
20 // VP8LColorCache.
21 
VP8LColorCacheInit(VP8LColorCache * const cc,int hash_bits)22 int VP8LColorCacheInit(VP8LColorCache* const cc, int hash_bits) {
23   const int hash_size = 1 << hash_bits;
24   assert(cc != NULL);
25   assert(hash_bits > 0);
26   cc->colors_ = (uint32_t*)WebPSafeCalloc((uint64_t)hash_size,
27                                           sizeof(*cc->colors_));
28   if (cc->colors_ == NULL) return 0;
29   cc->hash_shift_ = 32 - hash_bits;
30   return 1;
31 }
32 
VP8LColorCacheClear(VP8LColorCache * const cc)33 void VP8LColorCacheClear(VP8LColorCache* const cc) {
34   if (cc != NULL) {
35     WebPSafeFree(cc->colors_);
36     cc->colors_ = NULL;
37   }
38 }
39 
40