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/renderer.h"
  13 #include "cc/resources/resource_provider.h"
  14 #include "cc/resources/scoped_resource.h"
  15 #include "cc/resources/task_graph_runner.h"
  16
  17 namespace cc {
  18
  19 class ResourceProvider;
  20
  21 // This is the base class for code shared between the GL and software
  22 // renderer implementations.  "Direct" refers to the fact that it does not
  23 // delegate rendering to another compositor.
  24 class CC_EXPORT DirectRenderer : public Renderer {
  25  public:
  26   virtual ~DirectRenderer();
  27
  28   ResourceProvider* resource_provider() const { return resource_provider_; }
  29
  30   virtual bool CanReadPixels() const OVERRIDE;
  31   virtual void DecideRenderPassAllocationsForFrame(
  32       const RenderPassList& render_passes_in_draw_order) OVERRIDE;
  33   virtual bool HasAllocatedResourcesForTesting(RenderPass::Id id) const
  34       OVERRIDE;
  35   virtual void DrawFrame(RenderPassList* render_passes_in_draw_order,
  36                          ContextProvider* offscreen_context_provider,
  37                          float device_scale_factor,
  38                          const gfx::Rect& device_viewport_rect,
  39                          const gfx::Rect& device_clip_rect,
  40                          bool allow_partial_swap,
  41                          bool disable_picture_quad_image_filtering) OVERRIDE;
  42
  43   struct CC_EXPORT DrawingFrame {
  44     DrawingFrame();
  45     ~DrawingFrame();
  46
  47     const RenderPass* root_render_pass;
  48     const RenderPass* current_render_pass;
  49     const ScopedResource* current_texture;
  50
  51     gfx::RectF root_damage_rect;
  52     gfx::Rect device_viewport_rect;
  53     gfx::Rect device_clip_rect;
  54
  55     gfx::Transform projection_matrix;
  56     gfx::Transform window_matrix;
  57
  58     ContextProvider* offscreen_context_provider;
  59
  60     bool disable_picture_quad_image_filtering;
  61   };
  62
  63   void SetEnlargePassTextureAmountForTesting(const gfx::Vector2d& amount);
  64
  65  protected:
  66   DirectRenderer(RendererClient* client,
  67                  const LayerTreeSettings* settings,
  68                  OutputSurface* output_surface,
  69                  ResourceProvider* resource_provider);
  70
  71   static gfx::RectF QuadVertexRect();
  72   static void QuadRectTransform(gfx::Transform* quad_rect_transform,
  73                                 const gfx::Transform& quad_transform,
  74                                 const gfx::RectF& quad_rect);
  75   void InitializeViewport(DrawingFrame* frame,
  76                           const gfx::Rect& draw_rect,
  77                           const gfx::Rect& viewport_rect,
  78                           const gfx::Size& surface_size);
  79   gfx::Rect MoveFromDrawToWindowSpace(const gfx::RectF& draw_rect) const;
  80
  81   bool NeedDeviceClip(const DrawingFrame* frame) const;
  82   gfx::Rect DeviceClipRectInWindowSpace(const DrawingFrame* frame) const;
  83   static gfx::RectF ComputeScissorRectForRenderPass(const DrawingFrame* frame);
  84   void SetScissorStateForQuad(const DrawingFrame* frame, const DrawQuad& quad);
  85   void SetScissorStateForQuadWithRenderPassScissor(
  86       const DrawingFrame* frame,
  87       const DrawQuad& quad,
  88       const gfx::RectF& render_pass_scissor,
  89       bool* should_skip_quad);
  90   void SetScissorTestRectInDrawSpace(const DrawingFrame* frame,
  91                                      const gfx::RectF& draw_space_rect);
  92
  93   static gfx::Size RenderPassTextureSize(const RenderPass* render_pass);
  94
  95   void DrawRenderPass(DrawingFrame* frame,
  96                       const RenderPass* render_pass,
  97                       bool allow_partial_swap);
  98   bool UseRenderPass(DrawingFrame* frame, const RenderPass* render_pass);
  99
 100   void RunOnDemandRasterTask(internal::Task* on_demand_raster_task);
 101
 102   virtual void BindFramebufferToOutputSurface(DrawingFrame* frame) = 0;
 103   virtual bool BindFramebufferToTexture(DrawingFrame* frame,
 104                                         const ScopedResource* resource,
 105                                         const gfx::Rect& target_rect) = 0;
 106   virtual void SetDrawViewport(const gfx::Rect& window_space_viewport) = 0;
 107   virtual void SetScissorTestRect(const gfx::Rect& scissor_rect) = 0;
 108   virtual void DiscardPixels(bool has_external_stencil_test,
 109                              bool draw_rect_covers_full_surface) = 0;
 110   virtual void ClearFramebuffer(DrawingFrame* frame,
 111                                 bool has_external_stencil_test) = 0;
 112   virtual void DoDrawQuad(DrawingFrame* frame, const DrawQuad* quad) = 0;
 113   virtual void BeginDrawingFrame(DrawingFrame* frame) = 0;
 114   virtual void FinishDrawingFrame(DrawingFrame* frame) = 0;
 115   virtual void FinishDrawingQuadList();
 116   virtual bool FlippedFramebuffer() const = 0;
 117   virtual void EnsureScissorTestEnabled() = 0;
 118   virtual void EnsureScissorTestDisabled() = 0;
 119   virtual void DiscardBackbuffer() {}
 120   virtual void EnsureBackbuffer() {}
 121
 122   virtual void CopyCurrentRenderPassToBitmap(
 123       DrawingFrame* frame,
 124       scoped_ptr<CopyOutputRequest> request) = 0;
 125
 126   base::ScopedPtrHashMap<RenderPass::Id, ScopedResource> render_pass_textures_;
 127   OutputSurface* output_surface_;
 128   ResourceProvider* resource_provider_;
 129
 130   // For use in coordinate conversion, this stores the output rect, viewport
 131   // rect (= unflipped version of glViewport rect), and the size of target
 132   // framebuffer. During a draw, this stores the values for the current render
 133   // pass; in between draws, they retain the values for the root render pass of
 134   // the last draw.
 135   gfx::Rect current_draw_rect_;
 136   gfx::Rect current_viewport_rect_;
 137   gfx::Size current_surface_size_;
 138
 139  private:
 140   gfx::Vector2d enlarge_pass_texture_amount_;
 141
 142   internal::NamespaceToken on_demand_task_namespace_;
 143
 144   DISALLOW_COPY_AND_ASSIGN(DirectRenderer);
 145 };
 146
 147 }  // namespace cc
 148
 149 #endif  // CC_OUTPUT_DIRECT_RENDERER_H_