gpu_surface_noop.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_GPU_GPU_SURFACE_NOOP_H_
#define FLUTTER_SHELL_GPU_GPU_SURFACE_NOOP_H_
 
#include <Metal/Metal.h>
 
#include "flutter/flow/surface.h"
 
namespace flutter {
 
/// @brief A rendering surface that accepts rendering intent but does not render
///        anything.
///
/// This is useful for running on platforms that need an engine instance and
/// don't have the required drivers.
class GPUSurfaceNoop : public Surface {
 public:
  explicit GPUSurfaceNoop();
 
  // |Surface|
  ~GPUSurfaceNoop();
 
  // |Surface|
  bool IsValid() override;
 
  // |Surface|
  Surface::SurfaceData GetSurfaceData() const override;
 
 private:
  // |Surface|
  std::unique_ptr<SurfaceFrame> AcquireFrame(
      const DlISize& frame_size) override;
 
  std::unique_ptr<SurfaceFrame> AcquireFrameFromCAMetalLayer(
      const DlISize& frame_size);
 
  std::unique_ptr<SurfaceFrame> AcquireFrameFromMTLTexture(
      const DlISize& frame_size);
 
  // |Surface|
  DlMatrix 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;
 
  GPUSurfaceNoop(const GPUSurfaceNoop&) = delete;
 
  GPUSurfaceNoop& operator=(const GPUSurfaceNoop&) = delete;
};
 
}  // namespace flutter
 
#endif  // FLUTTER_SHELL_GPU_GPU_SURFACE_NOOP_H_