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 "cc/trees/property_tree.h"
  17 #include "ui/gfx/geometry/rect.h"
  18 #include "ui/gfx/geometry/vector2d.h"
  19 #include "ui/gfx/transform.h"
  20
  21 namespace cc {
  22
  23 class LayerImpl;
  24 class Layer;
  25 class SwapPromise;
  26 class PropertyTrees;
  27
  28 class CC_EXPORT LayerTreeHostCommon {
  29  public:
  30   static gfx::Rect CalculateVisibleRect(const gfx::Rect& target_surface_rect,
  31                                         const gfx::Rect& layer_bound_rect,
  32                                         const gfx::Transform& transform);
  33
  34   template <typename LayerType, typename RenderSurfaceLayerListType>
  35   struct CalcDrawPropsInputs {
  36    public:
  37     CalcDrawPropsInputs(LayerType* root_layer,
  38                         const gfx::Size& device_viewport_size,
  39                         const gfx::Transform& device_transform,
  40                         float device_scale_factor,
  41                         float page_scale_factor,
  42                         const LayerType* page_scale_layer,
  43                         const gfx::Vector2dF& elastic_overscroll,
  44                         const LayerType* elastic_overscroll_application_layer,
  45                         int max_texture_size,
  46                         bool can_use_lcd_text,
  47                         bool layers_always_allowed_lcd_text,
  48                         bool can_render_to_separate_surface,
  49                         bool can_adjust_raster_scales,
  50                         bool verify_property_trees,
  51                         RenderSurfaceLayerListType* render_surface_layer_list,
  52                         int current_render_surface_layer_list_id,
  53                         PropertyTrees* property_trees)
  54         : root_layer(root_layer),
  55           device_viewport_size(device_viewport_size),
  56           device_transform(device_transform),
  57           device_scale_factor(device_scale_factor),
  58           page_scale_factor(page_scale_factor),
  59           page_scale_layer(page_scale_layer),
  60           elastic_overscroll(elastic_overscroll),
  61           elastic_overscroll_application_layer(
  62               elastic_overscroll_application_layer),
  63           max_texture_size(max_texture_size),
  64           can_use_lcd_text(can_use_lcd_text),
  65           layers_always_allowed_lcd_text(layers_always_allowed_lcd_text),
  66           can_render_to_separate_surface(can_render_to_separate_surface),
  67           can_adjust_raster_scales(can_adjust_raster_scales),
  68           verify_property_trees(verify_property_trees),
  69           render_surface_layer_list(render_surface_layer_list),
  70           current_render_surface_layer_list_id(
  71               current_render_surface_layer_list_id),
  72           property_trees(property_trees) {}
  73
  74     LayerType* root_layer;
  75     gfx::Size device_viewport_size;
  76     gfx::Transform device_transform;
  77     float device_scale_factor;
  78     float page_scale_factor;
  79     const LayerType* page_scale_layer;
  80     gfx::Vector2dF elastic_overscroll;
  81     const LayerType* elastic_overscroll_application_layer;
  82     int max_texture_size;
  83     bool can_use_lcd_text;
  84     bool layers_always_allowed_lcd_text;
  85     bool can_render_to_separate_surface;
  86     bool can_adjust_raster_scales;
  87     bool verify_property_trees;
  88     RenderSurfaceLayerListType* render_surface_layer_list;
  89     int current_render_surface_layer_list_id;
  90     PropertyTrees* property_trees;
  91   };
  92
  93   template <typename LayerType, typename RenderSurfaceLayerListType>
  94   struct CalcDrawPropsInputsForTesting
  95       : public CalcDrawPropsInputs<LayerType, RenderSurfaceLayerListType> {
  96     CalcDrawPropsInputsForTesting(
  97         LayerType* root_layer,
  98         const gfx::Size& device_viewport_size,
  99         const gfx::Transform& device_transform,
 100         RenderSurfaceLayerListType* render_surface_layer_list);
 101     CalcDrawPropsInputsForTesting(
 102         LayerType* root_layer,
 103         const gfx::Size& device_viewport_size,
 104         RenderSurfaceLayerListType* render_surface_layer_list);
 105   };
 106
 107   typedef CalcDrawPropsInputs<Layer, RenderSurfaceLayerList>
 108       CalcDrawPropsMainInputs;
 109   typedef CalcDrawPropsInputsForTesting<Layer, RenderSurfaceLayerList>
 110       CalcDrawPropsMainInputsForTesting;
 111   static void UpdateRenderSurfaces(Layer* root_layer,
 112                                    bool can_render_to_separate_surface,
 113                                    const gfx::Transform& transform,
 114                                    bool preserves_2d_axis_alignment);
 115   static void UpdateRenderSurface(Layer* layer,
 116                                   bool can_render_to_separate_surface,
 117                                   gfx::Transform* transform,
 118                                   bool* animation_preserves_axis_alignment);
 119   static void CalculateDrawProperties(CalcDrawPropsMainInputs* inputs);
 120   static void PreCalculateMetaInformation(Layer* root_layer);
 121   static void PreCalculateMetaInformationForTesting(LayerImpl* root_layer);
 122   static void PreCalculateMetaInformationForTesting(Layer* root_layer);
 123
 124   typedef CalcDrawPropsInputs<LayerImpl, LayerImplList> CalcDrawPropsImplInputs;
 125   typedef CalcDrawPropsInputsForTesting<LayerImpl, LayerImplList>
 126       CalcDrawPropsImplInputsForTesting;
 127   static void CalculateDrawProperties(CalcDrawPropsImplInputs* inputs);
 128   static void CalculateDrawProperties(
 129       CalcDrawPropsImplInputsForTesting* inputs);
 130
 131   template <typename LayerType>
 132   static bool RenderSurfaceContributesToTarget(LayerType*,
 133                                                int target_surface_layer_id);
 134
 135   template <typename LayerType, typename Function>
 136   static void CallFunctionForSubtree(LayerType* layer,
 137                                      const Function& function);
 138
 139   // Returns a layer with the given id if one exists in the subtree starting
 140   // from the given root layer (including mask and replica layers).
 141   template <typename LayerType>
 142   static LayerType* FindLayerInSubtree(LayerType* root_layer, int layer_id);
 143
 144   static Layer* get_layer_as_raw_ptr(const LayerList& layers, size_t index) {
 145     return layers[index].get();
 146   }
 147
 148   static LayerImpl* get_layer_as_raw_ptr(const OwnedLayerImplList& layers,
 149                                          size_t index) {
 150     return layers[index];
 151   }
 152
 153   static LayerImpl* get_layer_as_raw_ptr(const LayerImplList& layers,
 154                                          size_t index) {
 155     return layers[index];
 156   }
 157
 158   struct ScrollUpdateInfo {
 159     int layer_id;
 160     // TODO(miletus): Use ScrollOffset once LayerTreeHost/Blink fully supports
 161     // franctional scroll offset.
 162     gfx::Vector2d scroll_delta;
 163   };
 164 };
 165
 166 struct CC_EXPORT ScrollAndScaleSet {
 167   ScrollAndScaleSet();
 168   ~ScrollAndScaleSet();
 169
 170   std::vector<LayerTreeHostCommon::ScrollUpdateInfo> scrolls;
 171   float page_scale_delta;
 172   gfx::Vector2dF elastic_overscroll_delta;
 173   float top_controls_delta;
 174   ScopedPtrVector<SwapPromise> swap_promises;
 175 };
 176
 177 template <typename LayerType>
 178 bool LayerTreeHostCommon::RenderSurfaceContributesToTarget(
 179     LayerType* layer,
 180     int target_surface_layer_id) {
 181   // A layer will either contribute its own content, or its render surface's
 182   // content, to the target surface. The layer contributes its surface's content
 183   // when both the following are true:
 184   //  (1) The layer actually has a render surface and rendering into that
 185   //      surface, and
 186   //  (2) The layer's render surface is not the same as the target surface.
 187   //
 188   // Otherwise, the layer just contributes itself to the target surface.
 189
 190   return layer->render_target() == layer &&
 191          layer->id() != target_surface_layer_id;
 192 }
 193
 194 template <typename LayerType>
 195 LayerType* LayerTreeHostCommon::FindLayerInSubtree(LayerType* root_layer,
 196                                                    int layer_id) {
 197   if (!root_layer)
 198     return NULL;
 199
 200   if (root_layer->id() == layer_id)
 201     return root_layer;
 202
 203   if (root_layer->mask_layer() && root_layer->mask_layer()->id() == layer_id)
 204     return root_layer->mask_layer();
 205
 206   if (root_layer->replica_layer() &&
 207       root_layer->replica_layer()->id() == layer_id)
 208     return root_layer->replica_layer();
 209
 210   for (size_t i = 0; i < root_layer->children().size(); ++i) {
 211     if (LayerType* found = FindLayerInSubtree(
 212             get_layer_as_raw_ptr(root_layer->children(), i), layer_id))
 213       return found;
 214   }
 215   return NULL;
 216 }
 217
 218 template <typename LayerType, typename Function>
 219 void LayerTreeHostCommon::CallFunctionForSubtree(LayerType* layer,
 220                                                  const Function& function) {
 221   function(layer);
 222
 223   if (LayerType* mask_layer = layer->mask_layer())
 224     function(mask_layer);
 225   if (LayerType* replica_layer = layer->replica_layer()) {
 226     function(replica_layer);
 227     if (LayerType* mask_layer = replica_layer->mask_layer())
 228       function(mask_layer);
 229   }
 230
 231   for (size_t i = 0; i < layer->children().size(); ++i) {
 232     CallFunctionForSubtree(get_layer_as_raw_ptr(layer->children(), i),
 233                            function);
 234   }
 235 }
 236
 237 CC_EXPORT PropertyTrees* GetPropertyTrees(Layer* layer);
 238 CC_EXPORT PropertyTrees* GetPropertyTrees(LayerImpl* layer);
 239
 240 template <typename LayerType, typename RenderSurfaceLayerListType>
 241 LayerTreeHostCommon::CalcDrawPropsInputsForTesting<LayerType,
 242                                                    RenderSurfaceLayerListType>::
 243     CalcDrawPropsInputsForTesting(
 244         LayerType* root_layer,
 245         const gfx::Size& device_viewport_size,
 246         const gfx::Transform& device_transform,
 247         RenderSurfaceLayerListType* render_surface_layer_list)
 248     : CalcDrawPropsInputs<LayerType, RenderSurfaceLayerListType>(
 249           root_layer,
 250           device_viewport_size,
 251           device_transform,
 252           1.f,
 253           1.f,
 254           NULL,
 255           gfx::Vector2dF(),
 256           NULL,
 257           std::numeric_limits<int>::max() / 2,
 258           false,
 259           false,
 260           true,
 261           false,
 262           false,
 263           render_surface_layer_list,
 264           0,
 265           GetPropertyTrees(root_layer)) {
 266   DCHECK(root_layer);
 267   DCHECK(render_surface_layer_list);
 268 }
 269
 270 template <typename LayerType, typename RenderSurfaceLayerListType>
 271 LayerTreeHostCommon::CalcDrawPropsInputsForTesting<LayerType,
 272                                                    RenderSurfaceLayerListType>::
 273     CalcDrawPropsInputsForTesting(
 274         LayerType* root_layer,
 275         const gfx::Size& device_viewport_size,
 276         RenderSurfaceLayerListType* render_surface_layer_list)
 277     : CalcDrawPropsInputs<LayerType, RenderSurfaceLayerListType>(
 278           root_layer,
 279           device_viewport_size,
 280           gfx::Transform(),
 281           1.f,
 282           1.f,
 283           NULL,
 284           gfx::Vector2dF(),
 285           NULL,
 286           std::numeric_limits<int>::max() / 2,
 287           false,
 288           false,
 289           true,
 290           false,
 291           false,
 292           render_surface_layer_list,
 293           0,
 294           GetPropertyTrees(root_layer)) {
 295   DCHECK(root_layer);
 296   DCHECK(render_surface_layer_list);
 297 }
 298
 299 }  // namespace cc
 300
 301 #endif  // CC_TREES_LAYER_TREE_HOST_COMMON_H_