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