chromium/src/third_party/blink/renderer/platform/graphics/gpu/image_layer_bridge.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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_GPU_IMAGE_LAYER_BRIDGE_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_GPU_IMAGE_LAYER_BRIDGE_H_

#include <memory>

#include "base/macros.h"
#include "cc/layers/texture_layer_client.h"
#include "cc/resources/shared_bitmap_id_registrar.h"
#include "components/viz/common/resources/resource_format.h"
#include "third_party/blink/renderer/platform/geometry/float_point.h"
#include "third_party/blink/renderer/platform/graphics/graphics_types.h"
#include "third_party/blink/renderer/platform/graphics/static_bitmap_image.h"
#include "third_party/blink/renderer/platform/heap/heap.h"
#include "third_party/blink/renderer/platform/platform_export.h"

namespace cc {
class CrossThreadSharedBitmap;
class Layer;
class TextureLayer;
}

namespace gfx {
class Size;
}

namespace blink {

class PLATFORM_EXPORT ImageLayerBridge
    : public GarbageCollected<ImageLayerBridge>,
      public cc::TextureLayerClient {
 public:
  ImageLayerBridge(OpacityMode);
  ~ImageLayerBridge() override;

  void SetImage(scoped_refptr<StaticBitmapImage>);
  void Dispose();

  // cc::TextureLayerClient implementation.
  bool PrepareTransferableResource(
      cc::SharedBitmapIdRegistrar* bitmap_registrar,
      viz::TransferableResource* out_resource,
      std::unique_ptr<viz::SingleReleaseCallback>* out_release_callback)
      override;

  scoped_refptr<StaticBitmapImage> GetImage() { return image_; }

  cc::Layer* CcLayer() const;

  void SetFilterQuality(SkFilterQuality filter_quality) {
    filter_quality_ = filter_quality;
  }
  void SetUV(const FloatPoint& left_top, const FloatPoint& right_bottom);

  bool IsAccelerated() { return image_ && image_->IsTextureBacked(); }

  void Trace(Visitor* visitor) const {}

 private:
  // SharedMemory bitmap that was registered with SharedBitmapIdRegistrar. Used
  // only with software compositing.
  struct RegisteredBitmap {
    RegisteredBitmap();
    RegisteredBitmap(RegisteredBitmap&& other);
    RegisteredBitmap& operator=(RegisteredBitmap&& other);

    scoped_refptr<cc::CrossThreadSharedBitmap> bitmap;
    cc::SharedBitmapIdRegistration registration;
  };

  // Returns a SharedMemory bitmap of |size|. Tries to recycle returned bitmaps
  // first and allocates a new bitmap if necessary. Note this will delete
  // recycled bitmaps that are the wrong size.
  RegisteredBitmap CreateOrRecycleBitmap(
      const gfx::Size& size,
      viz::ResourceFormat format,
      cc::SharedBitmapIdRegistrar* bitmap_registrar);

  void ResourceReleasedGpu(scoped_refptr<StaticBitmapImage>,
                           const gpu::SyncToken&,
                           bool lost_resource);

  void ResourceReleasedSoftware(RegisteredBitmap registered,
                                const gpu::SyncToken&,
                                bool lost_resource);

  scoped_refptr<StaticBitmapImage> image_;
  scoped_refptr<cc::TextureLayer> layer_;
  SkFilterQuality filter_quality_ = kLow_SkFilterQuality;

  // SharedMemory bitmaps that can be recycled.
  Vector<RegisteredBitmap> recycled_bitmaps_;

  bool disposed_ = false;
  bool has_presented_since_last_set_image_ = false;
  OpacityMode opacity_mode_ = kNonOpaque;

  DISALLOW_COPY_AND_ASSIGN(ImageLayerBridge);
};

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_GPU_IMAGE_LAYER_BRIDGE_H_