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 (at) 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 23 int 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 35 void VP8LColorCacheClear(VP8LColorCache* const cc) { 36 if (cc != NULL) { 37 WebPSafeFree(cc->colors_); 38 cc->colors_ = NULL; 39 } 40 } 41 42 void 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
