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 cc, int hash_bits) { 24 const int hash_size = 1 << hash_bits; 25 assert(cc != NULL); 26 assert(hash_bits > 0); 27 cc->colors_ = (uint32_t*)WebPSafeCalloc((uint64_t)hash_size, 28 sizeof(*cc->colors_)); 29 if (cc->colors_ == NULL) return 0; 30 cc->hash_shift_ = 32 - hash_bits; 31 cc->hash_bits_ = hash_bits; 32 return 1; 33} 34 35void VP8LColorCacheClear(VP8LColorCache* const cc) { 36 if (cc != NULL) { 37 WebPSafeFree(cc->colors_); 38 cc->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