image_decoding_store.h | Explore in Territory

/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_IMAGE_DECODING_STORE_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_IMAGE_DECODING_STORE_H_

#include <memory>
#include <utility>

#include "base/check_op.h"
#include "base/memory/memory_pressure_listener.h"
#include "base/memory/ptr_util.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/raw_ptr_exclusion.h"
#include "base/synchronization/lock.h"
#include "cc/paint/paint_image_generator.h"
#include "third_party/blink/renderer/platform/graphics/image_frame_generator.h"
#include "third_party/blink/renderer/platform/graphics/skia/sk_size_hash.h"
#include "third_party/blink/renderer/platform/image-decoders/image_decoder.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/doubly_linked_list.h"
#include "third_party/blink/renderer/platform/wtf/hash_set.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
#include "third_party/skia/include/core/SkSize.h"
#include "third_party/skia/include/core/SkTypes.h"

namespace blink {

// Decoder cache entry is identified by:
// 1. Pointer to ImageFrameGenerator.
// 2. Size of the image.
// 3. ImageDecoder::AlphaOption
struct DecoderCacheKey { … };

static inline bool operator==(const DecoderCacheKey& a,
                              const DecoderCacheKey& b) { … }

static inline bool operator!=(const DecoderCacheKey& a,
                              const DecoderCacheKey& b) { … }

// Base class for all cache entries.
class CacheEntry : public DoublyLinkedListNode<CacheEntry> { … };

class DecoderCacheEntry final : public CacheEntry { … };

}  // namespace blink

namespace WTF {

template <>
struct HashTraits<blink::DecoderCacheKey>
    : GenericHashTraits<blink::DecoderCacheKey> { … };

}  // namespace WTF

namespace blink {

// FUNCTION
//
// ImageDecodingStore is a class used to manage cached decoder objects.
//
// EXTERNAL OBJECTS
//
// ImageDecoder
//   A decoder object. It is used to decode raw data into bitmap images.
//
// ImageFrameGenerator
//   This is a direct user of this cache. Responsible for generating bitmap
//   images using an ImageDecoder. It contains encoded image data and is used
//   to represent one image file. It is used to index image and decoder
//   objects in the cache.
//
// THREAD SAFETY
//
// All public methods can be used on any thread.

class PLATFORM_EXPORT ImageDecodingStore final { … };

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_IMAGE_DECODING_STORE_H_
chromium/third_party/blink/renderer/platform/graphics/image_decoding_store.h
