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 <string.h>
17#include "src/utils/color_cache_utils.h"
18#include "src/utils/utils.h"
19
20//------------------------------------------------------------------------------
21// VP8LColorCache.
22
23int VP8LColorCacheInit(VP8LColorCache* const color_cache, int hash_bits) {
24 const int hash_size = 1 << hash_bits;
25 assert(color_cache != NULL);
26 assert(hash_bits > 0);
27 color_cache->colors_ = (uint32_t*)WebPSafeCalloc(
28 (uint64_t)hash_size, sizeof(*color_cache->colors_));
29 if (color_cache->colors_ == NULL) return 0;
30 color_cache->hash_shift_ = 32 - hash_bits;
31 color_cache->hash_bits_ = hash_bits;
32 return 1;
33}
34
35void VP8LColorCacheClear(VP8LColorCache* const color_cache) {
36 if (color_cache != NULL) {
37 WebPSafeFree(color_cache->colors_);
38 color_cache->colors_ = NULL;
39 }
40}
41
42void VP8LColorCacheCopy(const VP8LColorCache* const src,
43 VP8LColorCache* const dst) {
44 assert(src != NULL);
45 assert(dst != NULL);
46 assert(src->hash_bits_ == dst->hash_bits_);
47 memcpy(dst->colors_, src->colors_,
48 ((size_t)1u << dst->hash_bits_) * sizeof(*dst->colors_));
49}
50