vulkan_surface_pool.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_VULKAN_SURFACE_POOL_H_
#define FLUTTER_SHELL_PLATFORM_FUCHSIA_FLUTTER_VULKAN_SURFACE_POOL_H_
 
#include <fuchsia/ui/composition/cpp/fidl.h>
 
#include <unordered_map>
#include <vector>
 
#include "flutter/fml/macros.h"
#include "vulkan_surface.h"
 
namespace flutter_runner {
 
class VulkanSurfacePool final {
 public:
  // Only keep 12 surfaces at a time.  This value was based on how many
  // surfaces got cached in the old, exact-match-only caching logic.
  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;
 
  VulkanSurfacePool(vulkan::VulkanProvider& vulkan_provider,
                    sk_sp<GrDirectContext> context);
 
  ~VulkanSurfacePool();
 
  std::unique_ptr<VulkanSurface> CreateSurface(const SkISize& size);
  std::unique_ptr<VulkanSurface> AcquireSurface(const SkISize& size);
 
  void SubmitSurface(std::unique_ptr<SurfaceProducerSurface> surface);
 
  void AgeAndCollectOldBuffers();
 
  // Shrink all oversized |VulkanSurfaces| in |available_surfaces_| to as
  // small as they can be.
  void ShrinkToFit();
 
 private:
  vulkan::VulkanProvider& vulkan_provider_;
  sk_sp<GrDirectContext> context_;
  fuchsia::sysmem::AllocatorSyncPtr sysmem_allocator_;
  fuchsia::ui::composition::AllocatorPtr flatland_allocator_;
  std::vector<std::unique_ptr<VulkanSurface>> available_surfaces_;
  std::unordered_map<uintptr_t, std::unique_ptr<VulkanSurface>>
      pending_surfaces_;
 
  size_t trace_surfaces_created_ = 0;
  size_t trace_surfaces_reused_ = 0;
 
  std::unique_ptr<VulkanSurface> GetCachedOrCreateSurface(const SkISize& size);
 
  void RecycleSurface(std::unique_ptr<VulkanSurface> surface);
 
  void RecyclePendingSurface(uintptr_t surface_key);
 
  void TraceStats();
 
  FML_DISALLOW_COPY_AND_ASSIGN(VulkanSurfacePool);
};
 
}  // namespace flutter_runner
 
#endif  // FLUTTER_SHELL_PLATFORM_FUCHSIA_FLUTTER_VULKAN_SURFACE_POOL_H_