surface.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_FLOW_SURFACE_H_
#define FLUTTER_FLOW_SURFACE_H_
 
#include <memory>
 
#include "flutter/common/graphics/gl_context_switch.h"
#include "flutter/flow/embedded_views.h"
#include "flutter/flow/surface_frame.h"
#include "flutter/fml/macros.h"
 
class GrDirectContext;
 
namespace impeller {
class AiksContext;
}  // namespace impeller
 
namespace flutter {
 
/// Abstract Base Class that represents where we will be rendering content.
class Surface {
 public:
  /// A screenshot of the surface's raw data.
  struct SurfaceData {
    std::string pixel_format;
    sk_sp<SkData> data;
  };
 
  Surface();
 
  virtual ~Surface();
 
  virtual bool IsValid() = 0;
 
  virtual std::unique_ptr<SurfaceFrame> AcquireFrame(const SkISize& size) = 0;
 
  virtual SkMatrix GetRootTransformation() const = 0;
 
  virtual GrDirectContext* GetContext() = 0;
 
  virtual std::unique_ptr<GLContextResult> MakeRenderContextCurrent();
 
  virtual bool ClearRenderContext();
 
  virtual bool AllowsDrawingWhenGpuDisabled() const;
 
  virtual bool EnableRasterCache() const;
 
  virtual std::shared_ptr<impeller::AiksContext> GetAiksContext() const;
 
  /// Capture the `SurfaceData` currently present in the surface.
  ///
  /// Not guaranteed to work on all setups and not intended to be used in
  /// production. The data field will be null if it was unable to work.
  virtual SurfaceData GetSurfaceData() const;
 
 private:
  FML_DISALLOW_COPY_AND_ASSIGN(Surface);
};
 
}  // namespace flutter
 
#endif  // FLUTTER_FLOW_SURFACE_H_