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
22int 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
33void VP8LColorCacheClear(VP8LColorCache* const cc) {
34  if (cc != NULL) {
35    WebPSafeFree(cc->colors_);
36    cc->colors_ = NULL;
37  }
38}
39
40