embedder_render_target_cache.h

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// Copyright 2013 The Flutter 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 FLUTTER_SHELL_PLATFORM_EMBEDDER_EMBEDDER_RENDER_TARGET_CACHE_H_
#define FLUTTER_SHELL_PLATFORM_EMBEDDER_EMBEDDER_RENDER_TARGET_CACHE_H_
 
#include <set>
#include <stack>
#include <tuple>
#include <unordered_map>
 
#include "flutter/fml/macros.h"
#include "flutter/shell/platform/embedder/embedder_external_view.h"
 
namespace flutter {
 
//------------------------------------------------------------------------------
/// @brief      A cache used to reference render targets that are owned by the
///             embedder but needed by th engine to render a frame.
///
///             A map of class is managed by EmbedderExternalViewEmbedder. Each
///             instance of this class manages the cached render targets for a
///             view.
///
class EmbedderRenderTargetCache {
 public:
  EmbedderRenderTargetCache();
 
  ~EmbedderRenderTargetCache();
 
  std::unique_ptr<EmbedderRenderTarget> GetRenderTarget(
      const EmbedderExternalView::RenderTargetDescriptor& descriptor);
 
  std::set<std::unique_ptr<EmbedderRenderTarget>>
  ClearAllRenderTargetsInCache();
 
  void CacheRenderTarget(std::unique_ptr<EmbedderRenderTarget> target);
 
  size_t GetCachedTargetsCount() const;
 
 private:
  using CachedRenderTargets = std::unordered_multimap<
      EmbedderExternalView::RenderTargetDescriptor,
      std::unique_ptr<EmbedderRenderTarget>,
      EmbedderExternalView::RenderTargetDescriptor::Hash,
      EmbedderExternalView::RenderTargetDescriptor::Equal>;
 
  CachedRenderTargets cached_render_targets_;
 
  FML_DISALLOW_COPY_AND_ASSIGN(EmbedderRenderTargetCache);
};
 
}  // namespace flutter
 
#endif  // FLUTTER_SHELL_PLATFORM_EMBEDDER_EMBEDDER_RENDER_TARGET_CACHE_H_