text: // 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_SOFTWARE_H_
  #define FLUTTER_SHELL_GPU_GPU_SURFACE_SOFTWARE_H_
  
  #include "flutter/fml/macros.h"
  #include "flutter/fml/memory/weak_ptr.h"
  #include "flutter/shell/common/surface.h"
  #include "flutter/shell/gpu/gpu_surface_software_delegate.h"
  
  namespace flutter {
  
  class GPUSurfaceSoftware : public Surface {
   public:
    GPUSurfaceSoftware(GPUSurfaceSoftwareDelegate* delegate,
                       bool render_to_surface);
  
    ~GPUSurfaceSoftware() override;
  
    // |Surface|
    bool IsValid() override;
  
    // |Surface|
    std::unique_ptr<SurfaceFrame> AcquireFrame(
        const SkISize& size,
        const bool needs_readback) override;
  
    // |Surface|
    SkMatrix GetRootTransformation() const override;
  
    // |Surface|
    GrContext* GetContext() override;
  
    // |Surface|
    flutter::ExternalViewEmbedder* GetExternalViewEmbedder() override;
  
   private:
    GPUSurfaceSoftwareDelegate* delegate_;
    // 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.
    const bool render_to_surface_;
    fml::WeakPtrFactory<GPUSurfaceSoftware> weak_factory_;
  
    FML_DISALLOW_COPY_AND_ASSIGN(GPUSurfaceSoftware);
  };
  
  }  // namespace flutter
  
  #endif  // FLUTTER_SHELL_GPU_GPU_SURFACE_SOFTWARE_H_
  