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quiets an msvs /analyze warning, the cast is due to an earlier msvs build warning. C6297: Arithmetic overflow: 32-bit value is shifted, then cast to 64-bit value. Results might not be an expected value. Change-Id: I0bb6cda57879f2fbd1e3515f6753a11bc08d14ac
50 lines
1.6 KiB
C
50 lines
1.6 KiB
C
// Copyright 2012 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// Color Cache for WebP Lossless
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//
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// Author: Jyrki Alakuijala (jyrki@google.com)
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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#include "./color_cache.h"
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#include "../utils/utils.h"
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//------------------------------------------------------------------------------
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// VP8LColorCache.
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int VP8LColorCacheInit(VP8LColorCache* const cc, int hash_bits) {
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const int hash_size = 1 << hash_bits;
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assert(cc != NULL);
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assert(hash_bits > 0);
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cc->colors_ = (uint32_t*)WebPSafeCalloc((uint64_t)hash_size,
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sizeof(*cc->colors_));
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if (cc->colors_ == NULL) return 0;
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cc->hash_shift_ = 32 - hash_bits;
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cc->hash_bits_ = hash_bits;
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return 1;
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}
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void VP8LColorCacheClear(VP8LColorCache* const cc) {
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if (cc != NULL) {
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WebPSafeFree(cc->colors_);
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cc->colors_ = NULL;
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}
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}
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void VP8LColorCacheCopy(const VP8LColorCache* const src,
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VP8LColorCache* const dst) {
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assert(src != NULL);
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assert(dst != NULL);
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assert(src->hash_bits_ == dst->hash_bits_);
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memcpy(dst->colors_, src->colors_,
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((size_t)1u << dst->hash_bits_) * sizeof(*dst->colors_));
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}
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