Streamline the presentation of ImageBitmapRenderingContext

third_party/WebKit/Source/platform/graphics/gpu/ImageLayerBridge.h

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef ImageLayerBridge_h
+#define ImageLayerBridge_h
+
+#include "cc/layers/texture_layer_client.h"
+#include "platform/PlatformExport.h"
+#include "platform/graphics/StaticBitmapImage.h"
+#include "platform/heap/Heap.h"
+#include "wtf/WeakPtr.h"
+
+namespace cc {
+class SharedBitmap;
+}
+
+namespace blink {
+
+class WebLayer;
+class WebExternalTextureLayer;
+
+class PLATFORM_EXPORT ImageLayerBridge
+    : public GarbageCollectedFinalized<ImageLayerBridge>,
+      NON_EXPORTED_BASE(public cc::TextureLayerClient) {
+  WTF_MAKE_NONCOPYABLE(ImageLayerBridge);
+
+ public:
+  ImageLayerBridge(OpacityMode);
+  ~ImageLayerBridge();
+
+  void setImage(PassRefPtr<StaticBitmapImage>);
+  void dispose();
+
+  // cc::TextureLayerClient implementation.
+  bool PrepareTextureMailbox(
+      cc::TextureMailbox* outMailbox,
+      std::unique_ptr<cc::SingleReleaseCallback>* outReleaseCallback) override;
+
+  void mailboxReleasedGpu(RefPtr<StaticBitmapImage>,
+                          const gpu::SyncToken&,
+                          bool lostResource);
+
+  void mailboxReleasedSoftware(std::unique_ptr<cc::SharedBitmap>,
+                               const IntSize&,
+                               const gpu::SyncToken&,
+                               bool lostResource);
+
+  RefPtr<StaticBitmapImage> image() { return m_image; }
+
+  WebLayer* platformLayer() const;
+
+  void setFilterQuality(SkFilterQuality filterQuality) {
+    m_filterQuality = filterQuality;
+  }
+
+  bool isAccelerated() { return m_image->isTextureBacked(); }
+
+  DEFINE_INLINE_TRACE() {}
+
+ private:
+  std::unique_ptr<cc::SharedBitmap> createOrRecycleBitmap();
+
+  WeakPtrFactory<ImageLayerBridge> m_weakPtrFactory;
+  RefPtr<StaticBitmapImage> m_image;
+  std::unique_ptr<WebExternalTextureLayer> m_layer;
+  SkFilterQuality m_filterQuality = kLow_SkFilterQuality;
+
+  // Shared memory bitmaps that were released by the compositor and can be used
+  // again by this ImageLayerBridge.
+  struct RecycledBitmap {
+    std::unique_ptr<cc::SharedBitmap> bitmap;
+    IntSize size;
+  };
+  Vector<RecycledBitmap> m_recycledBitmaps;
+
+  bool m_disposed = false;
+  bool m_hasPresentedSinceLastSetImage = false;
+  OpacityMode m_opacityMode = NonOpaque;
+};
+
+}  // namespace blink
+
+#endif