cc/trees/layer_tree_host_common.h

   1 // Copyright 2011 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_TREES_LAYER_TREE_HOST_COMMON_H_
   6 #define CC_TREES_LAYER_TREE_HOST_COMMON_H_
   7
   8 #include <limits>
   9 #include <vector>
  10
  11 #include "base/bind.h"
  12 #include "base/memory/ref_counted.h"
  13 #include "cc/base/cc_export.h"
  14 #include "cc/base/scoped_ptr_vector.h"
  15 #include "cc/layers/layer_lists.h"
  16 #include "ui/gfx/rect.h"
  17 #include "ui/gfx/transform.h"
  18 #include "ui/gfx/vector2d.h"
  19
  20 namespace cc {
  21
  22 class LayerImpl;
  23 class Layer;
  24
  25 class CC_EXPORT LayerTreeHostCommon {
  26  public:
  27   static gfx::Rect CalculateVisibleRect(const gfx::Rect& target_surface_rect,
  28                                         const gfx::Rect& layer_bound_rect,
  29                                         const gfx::Transform& transform);
  30
  31   template <typename LayerType, typename RenderSurfaceLayerListType>
  32   struct CalcDrawPropsInputs {
  33    public:
  34     CalcDrawPropsInputs(LayerType* root_layer,
  35                         const gfx::Size& device_viewport_size,
  36                         const gfx::Transform& device_transform,
  37                         float device_scale_factor,
  38                         float page_scale_factor,
  39                         const LayerType* page_scale_application_layer,
  40                         int max_texture_size,
  41                         bool can_use_lcd_text,
  42                         bool can_render_to_separate_surface,
  43                         bool can_adjust_raster_scales,
  44                         RenderSurfaceLayerListType* render_surface_layer_list)
  45         : root_layer(root_layer),
  46           device_viewport_size(device_viewport_size),
  47           device_transform(device_transform),
  48           device_scale_factor(device_scale_factor),
  49           page_scale_factor(page_scale_factor),
  50           page_scale_application_layer(page_scale_application_layer),
  51           max_texture_size(max_texture_size),
  52           can_use_lcd_text(can_use_lcd_text),
  53           can_render_to_separate_surface(can_render_to_separate_surface),
  54           can_adjust_raster_scales(can_adjust_raster_scales),
  55           render_surface_layer_list(render_surface_layer_list) {}
  56
  57     LayerType* root_layer;
  58     gfx::Size device_viewport_size;
  59     const gfx::Transform& device_transform;
  60     float device_scale_factor;
  61     float page_scale_factor;
  62     const LayerType* page_scale_application_layer;
  63     int max_texture_size;
  64     bool can_use_lcd_text;
  65     bool can_render_to_separate_surface;
  66     bool can_adjust_raster_scales;
  67     RenderSurfaceLayerListType* render_surface_layer_list;
  68   };
  69
  70   template <typename LayerType, typename RenderSurfaceLayerListType>
  71   struct CalcDrawPropsInputsForTesting
  72       : public CalcDrawPropsInputs<LayerType, RenderSurfaceLayerListType> {
  73     CalcDrawPropsInputsForTesting(
  74         LayerType* root_layer,
  75         const gfx::Size& device_viewport_size,
  76         const gfx::Transform& device_transform,
  77         RenderSurfaceLayerListType* render_surface_layer_list);
  78     CalcDrawPropsInputsForTesting(
  79         LayerType* root_layer,
  80         const gfx::Size& device_viewport_size,
  81         RenderSurfaceLayerListType* render_surface_layer_list);
  82
  83    private:
  84     const gfx::Transform identity_transform_;
  85   };
  86
  87   typedef CalcDrawPropsInputs<Layer, RenderSurfaceLayerList>
  88       CalcDrawPropsMainInputs;
  89   typedef CalcDrawPropsInputsForTesting<Layer, RenderSurfaceLayerList>
  90       CalcDrawPropsMainInputsForTesting;
  91   static void CalculateDrawProperties(CalcDrawPropsMainInputs* inputs);
  92
  93   typedef CalcDrawPropsInputs<LayerImpl, LayerImplList> CalcDrawPropsImplInputs;
  94   typedef CalcDrawPropsInputsForTesting<LayerImpl, LayerImplList>
  95       CalcDrawPropsImplInputsForTesting;
  96   static void CalculateDrawProperties(CalcDrawPropsImplInputs* inputs);
  97
  98   // Performs hit testing for a given render_surface_layer_list.
  99   static LayerImpl* FindFirstScrollingLayerThatIsHitByPoint(
 100       const gfx::PointF& screen_space_point,
 101       const LayerImplList& render_surface_layer_list);
 102
 103   // Performs hit testing for a given render_surface_layer_list.
 104   static LayerImpl* FindLayerThatIsHitByPoint(
 105       const gfx::PointF& screen_space_point,
 106       const LayerImplList& render_surface_layer_list);
 107
 108   static LayerImpl* FindLayerThatIsHitByPointInTouchHandlerRegion(
 109       const gfx::PointF& screen_space_point,
 110       const LayerImplList& render_surface_layer_list);
 111
 112   static bool LayerHasTouchEventHandlersAt(
 113       const gfx::PointF& screen_space_point,
 114       LayerImpl* layer_impl);
 115
 116   template <typename LayerType>
 117   static bool RenderSurfaceContributesToTarget(LayerType*,
 118                                                int target_surface_layer_id);
 119
 120   template <typename LayerType>
 121   static void CallFunctionForSubtree(
 122       LayerType* root_layer,
 123       const base::Callback<void(LayerType* layer)>& function);
 124
 125   // Returns a layer with the given id if one exists in the subtree starting
 126   // from the given root layer (including mask and replica layers).
 127   template <typename LayerType>
 128   static LayerType* FindLayerInSubtree(LayerType* root_layer, int layer_id);
 129
 130   static Layer* get_child_as_raw_ptr(
 131       const LayerList& children,
 132       size_t index) {
 133     return children[index].get();
 134   }
 135
 136   static LayerImpl* get_child_as_raw_ptr(
 137       const OwnedLayerImplList& children,
 138       size_t index) {
 139     return children[index];
 140   }
 141
 142   struct ScrollUpdateInfo {
 143     int layer_id;
 144     gfx::Vector2d scroll_delta;
 145   };
 146 };
 147
 148 struct CC_EXPORT ScrollAndScaleSet {
 149   ScrollAndScaleSet();
 150   ~ScrollAndScaleSet();
 151
 152   std::vector<LayerTreeHostCommon::ScrollUpdateInfo> scrolls;
 153   float page_scale_delta;
 154 };
 155
 156 template <typename LayerType>
 157 bool LayerTreeHostCommon::RenderSurfaceContributesToTarget(
 158     LayerType* layer,
 159     int target_surface_layer_id) {
 160   // A layer will either contribute its own content, or its render surface's
 161   // content, to the target surface. The layer contributes its surface's content
 162   // when both the following are true:
 163   //  (1) The layer actually has a render surface, and
 164   //  (2) The layer's render surface is not the same as the target surface.
 165   //
 166   // Otherwise, the layer just contributes itself to the target surface.
 167
 168   return layer->render_surface() && layer->id() != target_surface_layer_id;
 169 }
 170
 171 template <typename LayerType>
 172 LayerType* LayerTreeHostCommon::FindLayerInSubtree(LayerType* root_layer,
 173                                                    int layer_id) {
 174   if (!root_layer)
 175     return NULL;
 176
 177   if (root_layer->id() == layer_id)
 178     return root_layer;
 179
 180   if (root_layer->mask_layer() && root_layer->mask_layer()->id() == layer_id)
 181     return root_layer->mask_layer();
 182
 183   if (root_layer->replica_layer() &&
 184       root_layer->replica_layer()->id() == layer_id)
 185     return root_layer->replica_layer();
 186
 187   for (size_t i = 0; i < root_layer->children().size(); ++i) {
 188     if (LayerType* found = FindLayerInSubtree(
 189             get_child_as_raw_ptr(root_layer->children(), i), layer_id))
 190       return found;
 191   }
 192   return NULL;
 193 }
 194
 195 template <typename LayerType>
 196 void LayerTreeHostCommon::CallFunctionForSubtree(
 197     LayerType* root_layer,
 198     const base::Callback<void(LayerType* layer)>& function) {
 199   function.Run(root_layer);
 200
 201   if (LayerType* mask_layer = root_layer->mask_layer())
 202     function.Run(mask_layer);
 203   if (LayerType* replica_layer = root_layer->replica_layer()) {
 204     function.Run(replica_layer);
 205     if (LayerType* mask_layer = replica_layer->mask_layer())
 206       function.Run(mask_layer);
 207   }
 208
 209   for (size_t i = 0; i < root_layer->children().size(); ++i) {
 210     CallFunctionForSubtree(get_child_as_raw_ptr(root_layer->children(), i),
 211                            function);
 212   }
 213 }
 214
 215 template <typename LayerType, typename RenderSurfaceLayerListType>
 216 LayerTreeHostCommon::CalcDrawPropsInputsForTesting<LayerType,
 217                                                    RenderSurfaceLayerListType>::
 218     CalcDrawPropsInputsForTesting(
 219         LayerType* root_layer,
 220         const gfx::Size& device_viewport_size,
 221         const gfx::Transform& device_transform,
 222         RenderSurfaceLayerListType* render_surface_layer_list)
 223     : CalcDrawPropsInputs<LayerType, RenderSurfaceLayerListType>(
 224           root_layer,
 225           device_viewport_size,
 226           device_transform,
 227           1.f,
 228           1.f,
 229           NULL,
 230           std::numeric_limits<int>::max() / 2,
 231           false,
 232           true,
 233           false,
 234           render_surface_layer_list) {
 235   DCHECK(root_layer);
 236   DCHECK(render_surface_layer_list);
 237 }
 238
 239 template <typename LayerType, typename RenderSurfaceLayerListType>
 240 LayerTreeHostCommon::CalcDrawPropsInputsForTesting<LayerType,
 241                                                    RenderSurfaceLayerListType>::
 242     CalcDrawPropsInputsForTesting(
 243         LayerType* root_layer,
 244         const gfx::Size& device_viewport_size,
 245         RenderSurfaceLayerListType* render_surface_layer_list)
 246     : CalcDrawPropsInputs<LayerType, RenderSurfaceLayerListType>(
 247           root_layer,
 248           device_viewport_size,
 249           identity_transform_,
 250           1.f,
 251           1.f,
 252           NULL,
 253           std::numeric_limits<int>::max() / 2,
 254           false,
 255           true,
 256           false,
 257           render_surface_layer_list) {
 258   DCHECK(root_layer);
 259   DCHECK(render_surface_layer_list);
 260 }
 261
 262 }  // namespace cc
 263
 264 #endif  // CC_TREES_LAYER_TREE_HOST_COMMON_H_