gpu_surface_gl_skia.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_GL_SKIA_H_
#define FLUTTER_SHELL_GPU_GPU_SURFACE_GL_SKIA_H_
 
#include <functional>
#include <memory>
 
#include "flutter/common/graphics/gl_context_switch.h"
#include "flutter/flow/embedded_views.h"
#include "flutter/flow/surface.h"
#include "flutter/fml/macros.h"
#include "flutter/fml/memory/weak_ptr.h"
#include "flutter/shell/gpu/gpu_surface_gl_delegate.h"
 
#include "third_party/skia/include/core/SkSurface.h"
#include "third_party/skia/include/gpu/GrDirectContext.h"
 
namespace flutter {
 
class GPUSurfaceGLSkia : public Surface {
 public:
  static sk_sp<GrDirectContext> MakeGLContext(GPUSurfaceGLDelegate* delegate);
 
  GPUSurfaceGLSkia(GPUSurfaceGLDelegate* delegate, bool render_to_surface);
 
  // Creates a new GL surface reusing an existing GrDirectContext.
  GPUSurfaceGLSkia(const sk_sp<GrDirectContext>& gr_context,
                   GPUSurfaceGLDelegate* delegate,
                   bool render_to_surface);
 
  // |Surface|
  ~GPUSurfaceGLSkia() override;
 
  // |Surface|
  bool IsValid() override;
 
  // |Surface|
  std::unique_ptr<SurfaceFrame> AcquireFrame(const SkISize& size) override;
 
  // |Surface|
  SkMatrix GetRootTransformation() const override;
 
  // |Surface|
  GrDirectContext* GetContext() override;
 
  // |Surface|
  std::unique_ptr<GLContextResult> MakeRenderContextCurrent() override;
 
  // |Surface|
  bool ClearRenderContext() override;
 
  // |Surface|
  bool AllowsDrawingWhenGpuDisabled() const override;
 
 private:
  bool CreateOrUpdateSurfaces(const SkISize& size);
 
  sk_sp<SkSurface> AcquireRenderSurface(
      const SkISize& untransformed_size,
      const SkMatrix& root_surface_transformation);
 
  bool PresentSurface(const SurfaceFrame& frame, DlCanvas* canvas);
 
  GPUSurfaceGLDelegate* delegate_;
  sk_sp<GrDirectContext> context_;
  sk_sp<SkSurface> onscreen_surface_;
  /// FBO backing the current `onscreen_surface_`.
  uint32_t fbo_id_ = 0;
  // The current FBO's existing damage, as tracked by the GPU surface, delegates
  // still have an option of overriding this damage with their own in
  // `GLContextFrameBufferInfo`.
  std::optional<SkIRect> existing_damage_ = std::nullopt;
  bool context_owner_ = false;
  // 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_ = true;
  bool valid_ = false;
 
  // WeakPtrFactory must be the last member.
  fml::TaskRunnerAffineWeakPtrFactory<GPUSurfaceGLSkia> weak_factory_;
  FML_DISALLOW_COPY_AND_ASSIGN(GPUSurfaceGLSkia);
};
 
}  // namespace flutter
 
#endif  // FLUTTER_SHELL_GPU_GPU_SURFACE_GL_SKIA_H_