render_surface_impl.cc revision 5d1f7b1de12d16ceb2c938c56701a3e8bfa558f7 
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#include "cc/layers/render_surface_impl.h"
6
7#include <algorithm>
8
9#include "base/logging.h"
10#include "base/strings/stringprintf.h"
11#include "cc/base/math_util.h"
12#include "cc/debug/debug_colors.h"
13#include "cc/layers/delegated_renderer_layer_impl.h"
14#include "cc/layers/layer_impl.h"
15#include "cc/layers/quad_sink.h"
16#include "cc/layers/render_pass_sink.h"
17#include "cc/quads/debug_border_draw_quad.h"
18#include "cc/quads/render_pass.h"
19#include "cc/quads/render_pass_draw_quad.h"
20#include "cc/quads/shared_quad_state.h"
21#include "cc/trees/damage_tracker.h"
22#include "third_party/skia/include/core/SkImageFilter.h"
23#include "ui/gfx/rect_conversions.h"
24#include "ui/gfx/transform.h"
25
26namespace cc {
27
28RenderSurfaceImpl::RenderSurfaceImpl(LayerImpl* owning_layer)
29    : owning_layer_(owning_layer),
30      surface_property_changed_(false),
31      draw_opacity_is_animating_(false),
32      target_surface_transforms_are_animating_(false),
33      screen_space_transforms_are_animating_(false),
34      is_clipped_(false),
35      contributes_to_drawn_surface_(false),
36      draw_opacity_(1),
37      nearest_occlusion_immune_ancestor_(NULL),
38      target_render_surface_layer_index_history_(0),
39      current_layer_index_history_(0) {
40  damage_tracker_ = DamageTracker::Create();
41}
42
43RenderSurfaceImpl::~RenderSurfaceImpl() {}
44
45gfx::RectF RenderSurfaceImpl::DrawableContentRect() const {
46  gfx::RectF drawable_content_rect =
47      MathUtil::MapClippedRect(draw_transform_, content_rect_);
48  if (owning_layer_->has_replica()) {
49    drawable_content_rect.Union(
50        MathUtil::MapClippedRect(replica_draw_transform_, content_rect_));
51  }
52
53  return drawable_content_rect;
54}
55
56int RenderSurfaceImpl::OwningLayerId() const {
57  return owning_layer_ ? owning_layer_->id() : 0;
58}
59
60
61void RenderSurfaceImpl::SetClipRect(const gfx::Rect& clip_rect) {
62  if (clip_rect_ == clip_rect)
63    return;
64
65  surface_property_changed_ = true;
66  clip_rect_ = clip_rect;
67}
68
69bool RenderSurfaceImpl::ContentsChanged() const {
70  return !damage_tracker_->current_damage_rect().IsEmpty();
71}
72
73void RenderSurfaceImpl::SetContentRect(const gfx::Rect& content_rect) {
74  if (content_rect_ == content_rect)
75    return;
76
77  surface_property_changed_ = true;
78  content_rect_ = content_rect;
79}
80
81bool RenderSurfaceImpl::SurfacePropertyChanged() const {
82  // Surface property changes are tracked as follows:
83  //
84  // - surface_property_changed_ is flagged when the clip_rect or content_rect
85  //   change. As of now, these are the only two properties that can be affected
86  //   by descendant layers.
87  //
88  // - all other property changes come from the owning layer (or some ancestor
89  //   layer that propagates its change to the owning layer).
90  //
91  DCHECK(owning_layer_);
92  return surface_property_changed_ || owning_layer_->LayerPropertyChanged();
93}
94
95bool RenderSurfaceImpl::SurfacePropertyChangedOnlyFromDescendant() const {
96  return surface_property_changed_ && !owning_layer_->LayerPropertyChanged();
97}
98
99void RenderSurfaceImpl::AddContributingDelegatedRenderPassLayer(
100    LayerImpl* layer) {
101  DCHECK(std::find(layer_list_.begin(), layer_list_.end(), layer) !=
102         layer_list_.end());
103  DelegatedRendererLayerImpl* delegated_renderer_layer =
104      static_cast<DelegatedRendererLayerImpl*>(layer);
105  contributing_delegated_render_pass_layer_list_.push_back(
106      delegated_renderer_layer);
107}
108
109void RenderSurfaceImpl::ClearLayerLists() {
110  layer_list_.clear();
111  contributing_delegated_render_pass_layer_list_.clear();
112}
113
114RenderPass::Id RenderSurfaceImpl::RenderPassId() {
115  int layer_id = owning_layer_->id();
116  int sub_id = 0;
117  DCHECK_GT(layer_id, 0);
118  return RenderPass::Id(layer_id, sub_id);
119}
120
121void RenderSurfaceImpl::AppendRenderPasses(RenderPassSink* pass_sink) {
122  for (size_t i = 0;
123       i < contributing_delegated_render_pass_layer_list_.size();
124       ++i) {
125    DelegatedRendererLayerImpl* delegated_renderer_layer =
126        contributing_delegated_render_pass_layer_list_[i];
127    delegated_renderer_layer->AppendContributingRenderPasses(pass_sink);
128  }
129
130  scoped_ptr<RenderPass> pass = RenderPass::Create(layer_list_.size());
131  pass->SetNew(RenderPassId(),
132               content_rect_,
133               damage_tracker_->current_damage_rect(),
134               screen_space_transform_);
135  pass_sink->AppendRenderPass(pass.Pass());
136}
137
138void RenderSurfaceImpl::AppendQuads(QuadSink* quad_sink,
139                                    AppendQuadsData* append_quads_data,
140                                    bool for_replica,
141                                    RenderPass::Id render_pass_id) {
142  DCHECK(!for_replica || owning_layer_->has_replica());
143
144  const gfx::Transform& draw_transform =
145      for_replica ? replica_draw_transform_ : draw_transform_;
146  SharedQuadState* shared_quad_state =
147      quad_sink->UseSharedQuadState(SharedQuadState::Create());
148  shared_quad_state->SetAll(draw_transform,
149                            content_rect_.size(),
150                            content_rect_,
151                            clip_rect_,
152                            is_clipped_,
153                            draw_opacity_,
154                            owning_layer_->blend_mode());
155
156  if (owning_layer_->ShowDebugBorders()) {
157    SkColor color = for_replica ?
158                    DebugColors::SurfaceReplicaBorderColor() :
159                    DebugColors::SurfaceBorderColor();
160    float width = for_replica ?
161                  DebugColors::SurfaceReplicaBorderWidth(
162                      owning_layer_->layer_tree_impl()) :
163                  DebugColors::SurfaceBorderWidth(
164                      owning_layer_->layer_tree_impl());
165    scoped_ptr<DebugBorderDrawQuad> debug_border_quad =
166        DebugBorderDrawQuad::Create();
167    debug_border_quad->SetNew(shared_quad_state, content_rect_, color, width);
168    quad_sink->Append(debug_border_quad.PassAs<DrawQuad>(), append_quads_data);
169  }
170
171  // TODO(shawnsingh): By using the same RenderSurfaceImpl for both the content
172  // and its reflection, it's currently not possible to apply a separate mask to
173  // the reflection layer or correctly handle opacity in reflections (opacity
174  // must be applied after drawing both the layer and its reflection). The
175  // solution is to introduce yet another RenderSurfaceImpl to draw the layer
176  // and its reflection in. For now we only apply a separate reflection mask if
177  // the contents don't have a mask of their own.
178  LayerImpl* mask_layer = owning_layer_->mask_layer();
179  if (mask_layer &&
180      (!mask_layer->DrawsContent() || mask_layer->bounds().IsEmpty()))
181    mask_layer = NULL;
182
183  if (!mask_layer && for_replica) {
184    mask_layer = owning_layer_->replica_layer()->mask_layer();
185    if (mask_layer &&
186        (!mask_layer->DrawsContent() || mask_layer->bounds().IsEmpty()))
187      mask_layer = NULL;
188  }
189
190  gfx::RectF mask_uv_rect(0.f, 0.f, 1.f, 1.f);
191  if (mask_layer) {
192    gfx::Vector2dF owning_layer_draw_scale =
193        MathUtil::ComputeTransform2dScaleComponents(
194            owning_layer_->draw_transform(), 1.f);
195    gfx::SizeF unclipped_mask_target_size = gfx::ScaleSize(
196        owning_layer_->content_bounds(),
197        owning_layer_draw_scale.x(),
198        owning_layer_draw_scale.y());
199
200    float uv_scale_x =
201        content_rect_.width() / unclipped_mask_target_size.width();
202    float uv_scale_y =
203        content_rect_.height() / unclipped_mask_target_size.height();
204
205    mask_uv_rect = gfx::RectF(
206        uv_scale_x * content_rect_.x() / content_rect_.width(),
207        uv_scale_y * content_rect_.y() / content_rect_.height(),
208        uv_scale_x,
209        uv_scale_y);
210  }
211
212  ResourceProvider::ResourceId mask_resource_id =
213      mask_layer ? mask_layer->ContentsResourceId() : 0;
214  gfx::Rect contents_changed_since_last_frame =
215      ContentsChanged() ? content_rect_ : gfx::Rect();
216
217  scoped_ptr<RenderPassDrawQuad> quad = RenderPassDrawQuad::Create();
218  quad->SetNew(shared_quad_state,
219               content_rect_,
220               render_pass_id,
221               for_replica,
222               mask_resource_id,
223               contents_changed_since_last_frame,
224               mask_uv_rect,
225               owning_layer_->filters(),
226               owning_layer_->background_filters());
227  quad_sink->Append(quad.PassAs<DrawQuad>(), append_quads_data);
228}
229
230}  // namespace cc
231