src/cc/output/direct_renderer.h

   1 // Copyright 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CC_OUTPUT_DIRECT_RENDERER_H_
   6 #define CC_OUTPUT_DIRECT_RENDERER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/callback.h"
  10 #include "base/containers/scoped_ptr_hash_map.h"
  11 #include "cc/base/cc_export.h"
  12 #include "cc/output/overlay_processor.h"
  13 #include "cc/output/renderer.h"
  14 #include "cc/resources/resource_provider.h"
  15 #include "cc/resources/scoped_resource.h"
  16 #include "cc/resources/task_graph_runner.h"
  17
  18 namespace cc {
  19
  20 class ResourceProvider;
  21
  22 // This is the base class for code shared between the GL and software
  23 // renderer implementations.  "Direct" refers to the fact that it does not
  24 // delegate rendering to another compositor.
  25 class CC_EXPORT DirectRenderer : public Renderer {
  26  public:
  27   virtual ~DirectRenderer();
  28
  29   virtual bool CanReadPixels() const OVERRIDE;
  30   virtual void DecideRenderPassAllocationsForFrame(
  31       const RenderPassList& render_passes_in_draw_order) OVERRIDE;
  32   virtual bool HasAllocatedResourcesForTesting(RenderPass::Id id) const
  33       OVERRIDE;
  34   virtual void DrawFrame(RenderPassList* render_passes_in_draw_order,
  35                          float device_scale_factor,
  36                          const gfx::Rect& device_viewport_rect,
  37                          const gfx::Rect& device_clip_rect,
  38                          bool disable_picture_quad_image_filtering) OVERRIDE;
  39
  40   struct CC_EXPORT DrawingFrame {
  41     DrawingFrame();
  42     ~DrawingFrame();
  43
  44     const RenderPass* root_render_pass;
  45     const RenderPass* current_render_pass;
  46     const ScopedResource* current_texture;
  47
  48     gfx::Rect root_damage_rect;
  49     gfx::Rect device_viewport_rect;
  50     gfx::Rect device_clip_rect;
  51
  52     gfx::Transform projection_matrix;
  53     gfx::Transform window_matrix;
  54
  55     bool disable_picture_quad_image_filtering;
  56
  57     OverlayCandidateList overlay_list;
  58   };
  59
  60   void SetEnlargePassTextureAmountForTesting(const gfx::Vector2d& amount);
  61
  62  protected:
  63   DirectRenderer(RendererClient* client,
  64                  const LayerTreeSettings* settings,
  65                  OutputSurface* output_surface,
  66                  ResourceProvider* resource_provider);
  67
  68   static gfx::RectF QuadVertexRect();
  69   static void QuadRectTransform(gfx::Transform* quad_rect_transform,
  70                                 const gfx::Transform& quad_transform,
  71                                 const gfx::RectF& quad_rect);
  72   void InitializeViewport(DrawingFrame* frame,
  73                           const gfx::Rect& draw_rect,
  74                           const gfx::Rect& viewport_rect,
  75                           const gfx::Size& surface_size);
  76   gfx::Rect MoveFromDrawToWindowSpace(const gfx::Rect& draw_rect) const;
  77
  78   bool NeedDeviceClip(const DrawingFrame* frame) const;
  79   gfx::Rect DeviceClipRectInWindowSpace(const DrawingFrame* frame) const;
  80   static gfx::Rect ComputeScissorRectForRenderPass(const DrawingFrame* frame);
  81   void SetScissorStateForQuad(const DrawingFrame* frame, const DrawQuad& quad);
  82   void SetScissorStateForQuadWithRenderPassScissor(
  83       const DrawingFrame* frame,
  84       const DrawQuad& quad,
  85       const gfx::Rect& render_pass_scissor,
  86       bool* should_skip_quad);
  87   void SetScissorTestRectInDrawSpace(const DrawingFrame* frame,
  88                                      const gfx::Rect& draw_space_rect);
  89
  90   static gfx::Size RenderPassTextureSize(const RenderPass* render_pass);
  91
  92   void DrawRenderPass(DrawingFrame* frame, const RenderPass* render_pass);
  93   bool UseRenderPass(DrawingFrame* frame, const RenderPass* render_pass);
  94
  95   void RunOnDemandRasterTask(Task* on_demand_raster_task);
  96
  97   virtual void BindFramebufferToOutputSurface(DrawingFrame* frame) = 0;
  98   virtual bool BindFramebufferToTexture(DrawingFrame* frame,
  99                                         const ScopedResource* resource,
 100                                         const gfx::Rect& target_rect) = 0;
 101   virtual void SetDrawViewport(const gfx::Rect& window_space_viewport) = 0;
 102   virtual void SetScissorTestRect(const gfx::Rect& scissor_rect) = 0;
 103   virtual void DiscardPixels(bool has_external_stencil_test,
 104                              bool draw_rect_covers_full_surface) = 0;
 105   virtual void ClearFramebuffer(DrawingFrame* frame,
 106                                 bool has_external_stencil_test) = 0;
 107   virtual void DoDrawQuad(DrawingFrame* frame, const DrawQuad* quad) = 0;
 108   virtual void BeginDrawingFrame(DrawingFrame* frame) = 0;
 109   virtual void FinishDrawingFrame(DrawingFrame* frame) = 0;
 110   virtual void FinishDrawingQuadList();
 111   virtual bool FlippedFramebuffer() const = 0;
 112   virtual void EnsureScissorTestEnabled() = 0;
 113   virtual void EnsureScissorTestDisabled() = 0;
 114   virtual void DiscardBackbuffer() {}
 115   virtual void EnsureBackbuffer() {}
 116
 117   virtual void CopyCurrentRenderPassToBitmap(
 118       DrawingFrame* frame,
 119       scoped_ptr<CopyOutputRequest> request) = 0;
 120
 121   base::ScopedPtrHashMap<RenderPass::Id, ScopedResource> render_pass_textures_;
 122   OutputSurface* output_surface_;
 123   ResourceProvider* resource_provider_;
 124   scoped_ptr<OverlayProcessor> overlay_processor_;
 125
 126   // For use in coordinate conversion, this stores the output rect, viewport
 127   // rect (= unflipped version of glViewport rect), and the size of target
 128   // framebuffer. During a draw, this stores the values for the current render
 129   // pass; in between draws, they retain the values for the root render pass of
 130   // the last draw.
 131   gfx::Rect current_draw_rect_;
 132   gfx::Rect current_viewport_rect_;
 133   gfx::Size current_surface_size_;
 134
 135  private:
 136   gfx::Vector2d enlarge_pass_texture_amount_;
 137
 138   NamespaceToken on_demand_task_namespace_;
 139
 140   DISALLOW_COPY_AND_ASSIGN(DirectRenderer);
 141 };
 142
 143 }  // namespace cc
 144
 145 #endif  // CC_OUTPUT_DIRECT_RENDERER_H_