cc/layers/view_transition_content_layer.h

// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CC_LAYERS_VIEW_TRANSITION_CONTENT_LAYER_H_
#define CC_LAYERS_VIEW_TRANSITION_CONTENT_LAYER_H_

#include <memory>

#include "base/logging.h"
#include "cc/cc_export.h"
#include "cc/layers/layer.h"
#include "components/viz/common/view_transition_element_resource_id.h"

namespace cc {

// A layer that renders a texture cached in the Viz process.
class CC_EXPORT ViewTransitionContentLayer : public Layer {
 public:
  static scoped_refptr<ViewTransitionContentLayer> Create(
      const viz::ViewTransitionElementResourceId& resource_id,
      bool is_live_content_layer);

  ViewTransitionContentLayer(const ViewTransitionContentLayer&) = delete;
  ViewTransitionContentLayer& operator=(const ViewTransitionContentLayer&) =
      delete;

  viz::ViewTransitionElementResourceId ViewTransitionResourceId()
      const override;

  // Layer overrides.
  std::unique_ptr<LayerImpl> CreateLayerImpl(
      LayerTreeImpl* tree_impl) const override;

  bool is_live_content_layer() const { return is_live_content_layer_; }
  void SetPaintOffset(gfx::Point offset) { paint_offset_ = offset; }
  gfx::Point paint_offset() const { return paint_offset_; }

  // This is a superset of the captured rect, in the element's enclosing layer's
  // coordinate space. If not set, it's assumed that the layer is already sized
  // to match the originating element's painted contents (e.g. the root element,
  // or displaying captured snapshots of the old content).
  void SetMaxExtentsRectInOriginatingLayerSpace(
      const gfx::RectF& max_extents_rect_in_originating_layer_space);

 protected:
  explicit ViewTransitionContentLayer(
      const viz::ViewTransitionElementResourceId& resource_id,
      bool is_live_content_layer);
  void PushDirtyPropertiesTo(
      LayerImpl* layer,
      uint8_t dirty_flag,
      const CommitState& commit_state,
      const ThreadUnsafeCommitState& unsafe_state) override;

 private:
  ~ViewTransitionContentLayer() override;

  const viz::ViewTransitionElementResourceId resource_id_;
  const bool is_live_content_layer_;
  ProtectedSequenceReadable<gfx::RectF> max_extents_rect_;
  gfx::Point paint_offset_;
};

}  // namespace cc

#endif  // CC_LAYERS_VIEW_TRANSITION_CONTENT_LAYER_H_