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