libwebp-0.6.0-rc1

third_party/libwebp/utils/color_cache.c

-// Copyright 2012 Google Inc. All Rights Reserved.
-//
-// Use of this source code is governed by a BSD-style license
-// that can be found in the COPYING file in the root of the source
-// tree. An additional intellectual property rights grant can be found
-// in the file PATENTS. All contributing project authors may
-// be found in the AUTHORS file in the root of the source tree.
-// -----------------------------------------------------------------------------
-//
-// Color Cache for WebP Lossless
-//
-// Author: Jyrki Alakuijala (jyrki@google.com)
-
-#include <assert.h>
-#include <stdlib.h>
-#include <string.h>
-#include "./color_cache.h"
-#include "./utils.h"
-
-//------------------------------------------------------------------------------
-// VP8LColorCache.
-
-int VP8LColorCacheInit(VP8LColorCache* const cc, int hash_bits) {
-  const int hash_size = 1 << hash_bits;
-  assert(cc != NULL);
-  assert(hash_bits > 0);
-  cc->colors_ = (uint32_t*)WebPSafeCalloc((uint64_t)hash_size,
-                                          sizeof(*cc->colors_));
-  if (cc->colors_ == NULL) return 0;
-  cc->hash_shift_ = 32 - hash_bits;
-  cc->hash_bits_ = hash_bits;
-  return 1;
-}
-
-void VP8LColorCacheClear(VP8LColorCache* const cc) {
-  if (cc != NULL) {
-    WebPSafeFree(cc->colors_);
-    cc->colors_ = NULL;
-  }
-}
-
-void VP8LColorCacheCopy(const VP8LColorCache* const src,
-                        VP8LColorCache* const dst) {
-  assert(src != NULL);
-  assert(dst != NULL);
-  assert(src->hash_bits_ == dst->hash_bits_);
-  memcpy(dst->colors_, src->colors_,
-         ((size_t)1u << dst->hash_bits_) * sizeof(*dst->colors_));
-}