software_surface_producer.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_FUCHSIA_FLUTTER_SOFTWARE_SURFACE_PRODUCER_H_
#define FLUTTER_SHELL_PLATFORM_FUCHSIA_FLUTTER_SOFTWARE_SURFACE_PRODUCER_H_
 
#include <fuchsia/sysmem2/cpp/fidl.h>
#include <fuchsia/ui/composition/cpp/fidl.h>
 
#include <unordered_map>
 
#include "flutter/fml/macros.h"
#include "flutter/shell/platform/fuchsia/flutter/software_surface.h"
 
namespace flutter_runner {
 
class SoftwareSurfaceProducer final : public SurfaceProducer {
 public:
  // Only keep 12 surfaces at a time.
  static constexpr int kMaxSurfaces = 12;
  // If a surface doesn't get used for 3 or more generations, we discard it.
  static constexpr int kMaxSurfaceAge = 3;
 
  explicit SoftwareSurfaceProducer();
  ~SoftwareSurfaceProducer() override;
 
  bool IsValid() const { return valid_; }
 
  // |SurfaceProducer|
  GrDirectContext* gr_context() const override { return nullptr; }
 
  // |SurfaceProducer|
  std::unique_ptr<SurfaceProducerSurface> ProduceOffscreenSurface(
      const SkISize& size) override;
 
  // |SurfaceProducer|
  std::unique_ptr<SurfaceProducerSurface> ProduceSurface(
      const SkISize& size) override;
 
  // |SurfaceProducer|
  void SubmitSurfaces(
      std::vector<std::unique_ptr<SurfaceProducerSurface>> surfaces) override;
 
 private:
  void SubmitSurface(std::unique_ptr<SurfaceProducerSurface> surface);
  std::unique_ptr<SoftwareSurface> CreateSurface(const SkISize& size);
  void RecycleSurface(std::unique_ptr<SoftwareSurface> surface);
 
  void RecyclePendingSurface(uintptr_t surface_key);
 
  void AgeAndCollectOldBuffers();
 
  void TraceStats();
 
  fuchsia::sysmem2::AllocatorSyncPtr sysmem_allocator_;
  fuchsia::ui::composition::AllocatorPtr flatland_allocator_;
 
  // These surfaces are available for re-use.
  std::vector<std::unique_ptr<SoftwareSurface>> available_surfaces_;
  // These surfaces have been written to, but scenic is not finished reading
  // from them yet.
  std::unordered_map<uintptr_t, std::unique_ptr<SoftwareSurface>>
      pending_surfaces_;
 
  size_t trace_surfaces_created_ = 0;
  size_t trace_surfaces_reused_ = 0;
 
  bool valid_ = false;
 
  FML_DISALLOW_COPY_AND_ASSIGN(SoftwareSurfaceProducer);
};
 
}  // namespace flutter_runner
 
#endif  // FLUTTER_SHELL_PLATFORM_FUCHSIA_FLUTTER_SOFTWARE_SURFACE_PRODUCER_H_