cc/output/software_renderer.h

// Copyright 2012 The Chromium 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 CC_OUTPUT_SOFTWARE_RENDERER_H_
#define CC_OUTPUT_SOFTWARE_RENDERER_H_

#include "base/basictypes.h"
#include "cc/base/cc_export.h"
#include "cc/output/compositor_frame.h"
#include "cc/output/direct_renderer.h"

namespace cc {

class OutputSurface;
class RendererClient;
class ResourceProvider;
class SoftwareOutputDevice;

class CheckerboardDrawQuad;
class DebugBorderDrawQuad;
class PictureDrawQuad;
class RenderPassDrawQuad;
class SolidColorDrawQuad;
class TextureDrawQuad;
class TileDrawQuad;

class CC_EXPORT SoftwareRenderer : public DirectRenderer {
 public:
  static scoped_ptr<SoftwareRenderer> Create(
      RendererClient* client,
      const RendererSettings* settings,
      OutputSurface* output_surface,
      ResourceProvider* resource_provider);

  ~SoftwareRenderer() override;
  const RendererCapabilitiesImpl& Capabilities() const override;
  void Finish() override;
  void SwapBuffers(const CompositorFrameMetadata& metadata) override;
  void DiscardBackbuffer() override;
  void EnsureBackbuffer() override;

 protected:
  void BindFramebufferToOutputSurface(DrawingFrame* frame) override;
  bool BindFramebufferToTexture(DrawingFrame* frame,
                                const ScopedResource* texture,
                                const gfx::Rect& target_rect) override;
  void SetScissorTestRect(const gfx::Rect& scissor_rect) override;
  void PrepareSurfaceForPass(DrawingFrame* frame,
                             SurfaceInitializationMode initialization_mode,
                             const gfx::Rect& render_pass_scissor) override;

  void DoDrawQuad(DrawingFrame* frame,
                  const DrawQuad* quad,
                  const gfx::QuadF* draw_region) override;
  void BeginDrawingFrame(DrawingFrame* frame) override;
  void FinishDrawingFrame(DrawingFrame* frame) override;
  bool FlippedFramebuffer(const DrawingFrame* frame) const override;
  void EnsureScissorTestEnabled() override;
  void EnsureScissorTestDisabled() override;
  void CopyCurrentRenderPassToBitmap(
      DrawingFrame* frame,
      scoped_ptr<CopyOutputRequest> request) override;

  SoftwareRenderer(RendererClient* client,
                   const RendererSettings* settings,
                   OutputSurface* output_surface,
                   ResourceProvider* resource_provider);

  void DidChangeVisibility() override;

 private:
  void ClearCanvas(SkColor color);
  void ClearFramebuffer(DrawingFrame* frame);
  void SetClipRect(const gfx::Rect& rect);
  bool IsSoftwareResource(ResourceId resource_id) const;

  void DrawCheckerboardQuad(const DrawingFrame* frame,
                            const CheckerboardDrawQuad* quad);
  void DrawDebugBorderQuad(const DrawingFrame* frame,
                           const DebugBorderDrawQuad* quad);
  void DrawPictureQuad(const DrawingFrame* frame,
                       const PictureDrawQuad* quad);
  void DrawRenderPassQuad(const DrawingFrame* frame,
                          const RenderPassDrawQuad* quad);
  void DrawSolidColorQuad(const DrawingFrame* frame,
                          const SolidColorDrawQuad* quad);
  void DrawTextureQuad(const DrawingFrame* frame,
                       const TextureDrawQuad* quad);
  void DrawTileQuad(const DrawingFrame* frame,
                    const TileDrawQuad* quad);
  void DrawUnsupportedQuad(const DrawingFrame* frame,
                           const DrawQuad* quad);
  bool ShouldApplyBackgroundFilters(const RenderPassDrawQuad* quad) const;
  SkBitmap ApplyImageFilter(SkImageFilter* filter,
                            const RenderPassDrawQuad* quad,
                            const SkBitmap* to_filter) const;
  gfx::Rect GetBackdropBoundingBoxForRenderPassQuad(
      const DrawingFrame* frame,
      const RenderPassDrawQuad* quad,
      const gfx::Transform& contents_device_transform) const;
  SkBitmap GetBackdropBitmap(const gfx::Rect& bounding_rect) const;
  skia::RefPtr<SkShader> GetBackgroundFilterShader(
      const DrawingFrame* frame,
      const RenderPassDrawQuad* quad,
      SkShader::TileMode content_tile_mode) const;

  RendererCapabilitiesImpl capabilities_;
  bool is_scissor_enabled_;
  bool is_backbuffer_discarded_;
  gfx::Rect scissor_rect_;

  SoftwareOutputDevice* output_device_;
  SkCanvas* root_canvas_;
  SkCanvas* current_canvas_;
  SkPaint current_paint_;
  scoped_ptr<ResourceProvider::ScopedWriteLockSoftware>
      current_framebuffer_lock_;
  skia::RefPtr<SkCanvas> current_framebuffer_canvas_;

  DISALLOW_COPY_AND_ASSIGN(SoftwareRenderer);
};

}  // namespace cc

#endif  // CC_OUTPUT_SOFTWARE_RENDERER_H_