// 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_GPU_GPU_SURFACE_METAL_IMPELLER_H_
#define FLUTTER_SHELL_GPU_GPU_SURFACE_METAL_IMPELLER_H_

#include <Metal/Metal.h>

#include "flutter/flow/surface.h"
#include "flutter/fml/macros.h"
#include "flutter/fml/platform/darwin/scoped_nsobject.h"
#include "flutter/impeller/aiks/aiks_context.h"
#include "flutter/impeller/renderer/backend/metal/context_mtl.h"
#include "flutter/impeller/renderer/renderer.h"
#include "flutter/shell/gpu/gpu_surface_metal_delegate.h"
#include "third_party/skia/include/gpu/mtl/GrMtlTypes.h"

namespace flutter {

class IMPELLER_CA_METAL_LAYER_AVAILABLE GPUSurfaceMetalImpeller
    : public Surface {
 public:
  GPUSurfaceMetalImpeller(GPUSurfaceMetalDelegate* delegate,
                          const std::shared_ptr<impeller::Context>& context,
                          bool render_to_surface = true);

  // |Surface|
  ~GPUSurfaceMetalImpeller();

  // |Surface|
  bool IsValid() override;

  virtual Surface::SurfaceData GetSurfaceData() const override;

 private:
  const GPUSurfaceMetalDelegate* delegate_;
  const MTLRenderTargetType render_target_type_;
  std::shared_ptr<impeller::Renderer> impeller_renderer_;
  std::shared_ptr<impeller::AiksContext> aiks_context_;
  fml::scoped_nsprotocol<id<MTLTexture>> last_texture_;
  // TODO(38466): Refactor GPU surface APIs take into account the fact that an
  // external view embedder may want to render to the root surface. This is a
  // hack to make avoid allocating resources for the root surface when an
  // external view embedder is present.
  bool render_to_surface_ = true;
  bool disable_partial_repaint_ = false;
  // Accumulated damage for each framebuffer; Key is address of underlying
  // MTLTexture for each drawable
  std::map<uintptr_t, SkIRect> damage_;

  // |Surface|
  std::unique_ptr<SurfaceFrame> AcquireFrame(
      const SkISize& frame_size) override;

  std::unique_ptr<SurfaceFrame> AcquireFrameFromCAMetalLayer(
      const SkISize& frame_size);

  std::unique_ptr<SurfaceFrame> AcquireFrameFromMTLTexture(
      const SkISize& frame_size);

  // |Surface|
  SkMatrix GetRootTransformation() const override;

  // |Surface|
  GrDirectContext* GetContext() override;

  // |Surface|
  std::unique_ptr<GLContextResult> MakeRenderContextCurrent() override;

  // |Surface|
  bool AllowsDrawingWhenGpuDisabled() const override;

  // |Surface|
  bool EnableRasterCache() const override;

  // |Surface|
  std::shared_ptr<impeller::AiksContext> GetAiksContext() const override;

  FML_DISALLOW_COPY_AND_ASSIGN(GPUSurfaceMetalImpeller);
};

}  // namespace flutter

#endif  // FLUTTER_SHELL_GPU_GPU_SURFACE_METAL_IMPELLER_H_