src/cc/layers/delegated_renderer_layer_impl.cc

   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 #include "cc/layers/delegated_renderer_layer_impl.h"
   6
   7 #include <algorithm>
   8 #include <utility>
   9
  10 #include "base/bind.h"
  11 #include "base/containers/hash_tables.h"
  12 #include "cc/base/math_util.h"
  13 #include "cc/layers/append_quads_data.h"
  14 #include "cc/layers/render_pass_sink.h"
  15 #include "cc/output/delegated_frame_data.h"
  16 #include "cc/quads/render_pass_draw_quad.h"
  17 #include "cc/quads/solid_color_draw_quad.h"
  18 #include "cc/trees/layer_tree_impl.h"
  19 #include "cc/trees/occlusion_tracker.h"
  20
  21 namespace cc {
  22
  23 DelegatedRendererLayerImpl::DelegatedRendererLayerImpl(LayerTreeImpl* tree_impl,
  24                                                        int id)
  25     : LayerImpl(tree_impl, id),
  26       have_render_passes_to_push_(false),
  27       inverse_device_scale_factor_(1.0f),
  28       child_id_(0),
  29       own_child_id_(false) {
  30 }
  31
  32 DelegatedRendererLayerImpl::~DelegatedRendererLayerImpl() {
  33   ClearRenderPasses();
  34   ClearChildId();
  35 }
  36
  37 bool DelegatedRendererLayerImpl::HasDelegatedContent() const { return true; }
  38
  39 bool DelegatedRendererLayerImpl::HasContributingDelegatedRenderPasses() const {
  40   // The root RenderPass for the layer is merged with its target
  41   // RenderPass in each frame. So we only have extra RenderPasses
  42   // to merge when we have a non-root RenderPass present.
  43   return render_passes_in_draw_order_.size() > 1;
  44 }
  45
  46 static ResourceProvider::ResourceId ResourceRemapHelper(
  47     bool* invalid_frame,
  48     const ResourceProvider::ResourceIdMap& child_to_parent_map,
  49     ResourceProvider::ResourceIdArray* resources_in_frame,
  50     ResourceProvider::ResourceId id) {
  51
  52   ResourceProvider::ResourceIdMap::const_iterator it =
  53       child_to_parent_map.find(id);
  54   if (it == child_to_parent_map.end()) {
  55     *invalid_frame = true;
  56     return 0;
  57   }
  58
  59   DCHECK_EQ(it->first, id);
  60   ResourceProvider::ResourceId remapped_id = it->second;
  61   resources_in_frame->push_back(id);
  62   return remapped_id;
  63 }
  64
  65 void DelegatedRendererLayerImpl::PushPropertiesTo(LayerImpl* layer) {
  66   LayerImpl::PushPropertiesTo(layer);
  67
  68   DelegatedRendererLayerImpl* delegated_layer =
  69       static_cast<DelegatedRendererLayerImpl*>(layer);
  70
  71   // If we have a new child_id to give to the active layer, it should
  72   // have already deleted its old child_id.
  73   DCHECK(delegated_layer->child_id_ == 0 ||
  74          delegated_layer->child_id_ == child_id_);
  75   delegated_layer->inverse_device_scale_factor_ = inverse_device_scale_factor_;
  76   delegated_layer->child_id_ = child_id_;
  77   delegated_layer->own_child_id_ = true;
  78   own_child_id_ = false;
  79
  80   if (have_render_passes_to_push_) {
  81     // This passes ownership of the render passes to the active tree.
  82     delegated_layer->SetRenderPasses(&render_passes_in_draw_order_);
  83     DCHECK(render_passes_in_draw_order_.empty());
  84     have_render_passes_to_push_ = false;
  85   }
  86
  87   // This is just a copy for testing, since resources are added to the
  88   // ResourceProvider in the pending tree.
  89   delegated_layer->resources_ = resources_;
  90 }
  91
  92 void DelegatedRendererLayerImpl::CreateChildIdIfNeeded(
  93     const ReturnCallback& return_callback) {
  94   if (child_id_)
  95     return;
  96
  97   ResourceProvider* resource_provider = layer_tree_impl()->resource_provider();
  98   child_id_ = resource_provider->CreateChild(return_callback);
  99   own_child_id_ = true;
 100 }
 101
 102 void DelegatedRendererLayerImpl::SetFrameData(
 103     const DelegatedFrameData* frame_data,
 104     const gfx::RectF& damage_in_frame) {
 105   DCHECK(child_id_) << "CreateChildIdIfNeeded must be called first.";
 106   DCHECK(frame_data);
 107   DCHECK(!frame_data->render_pass_list.empty());
 108   // A frame with an empty root render pass is invalid.
 109   DCHECK(!frame_data->render_pass_list.back()->output_rect.IsEmpty());
 110
 111   ResourceProvider* resource_provider = layer_tree_impl()->resource_provider();
 112     const ResourceProvider::ResourceIdMap& resource_map =
 113         resource_provider->GetChildToParentMap(child_id_);
 114
 115   resource_provider->ReceiveFromChild(child_id_, frame_data->resource_list);
 116
 117   RenderPassList render_pass_list;
 118   RenderPass::CopyAll(frame_data->render_pass_list, &render_pass_list);
 119
 120   bool invalid_frame = false;
 121   ResourceProvider::ResourceIdArray resources_in_frame;
 122   DrawQuad::ResourceIteratorCallback remap_resources_to_parent_callback =
 123       base::Bind(&ResourceRemapHelper,
 124                  &invalid_frame,
 125                  resource_map,
 126                  &resources_in_frame);
 127   for (size_t i = 0; i < render_pass_list.size(); ++i) {
 128     RenderPass* pass = render_pass_list[i];
 129     for (size_t j = 0; j < pass->quad_list.size(); ++j) {
 130       DrawQuad* quad = pass->quad_list[j];
 131       quad->IterateResources(remap_resources_to_parent_callback);
 132     }
 133   }
 134
 135   if (invalid_frame) {
 136     // Declare we are still using the last frame's resources.
 137     resource_provider->DeclareUsedResourcesFromChild(child_id_, resources_);
 138     return;
 139   }
 140
 141   // Declare we are using the new frame's resources.
 142   resources_.swap(resources_in_frame);
 143   resource_provider->DeclareUsedResourcesFromChild(child_id_, resources_);
 144
 145   inverse_device_scale_factor_ = 1.0f / frame_data->device_scale_factor;
 146   // Display size is already set so we can compute what the damage rect
 147   // will be in layer space. The damage may exceed the visible portion of
 148   // the frame, so intersect the damage to the layer's bounds.
 149   RenderPass* new_root_pass = render_pass_list.back();
 150   gfx::Size frame_size = new_root_pass->output_rect.size();
 151   gfx::RectF damage_in_layer = damage_in_frame;
 152   damage_in_layer.Scale(inverse_device_scale_factor_);
 153   SetUpdateRect(gfx::IntersectRects(
 154       gfx::UnionRects(update_rect(), damage_in_layer), gfx::Rect(bounds())));
 155
 156   SetRenderPasses(&render_pass_list);
 157   have_render_passes_to_push_ = true;
 158 }
 159
 160 void DelegatedRendererLayerImpl::SetRenderPasses(
 161     RenderPassList* render_passes_in_draw_order) {
 162   ClearRenderPasses();
 163
 164   for (size_t i = 0; i < render_passes_in_draw_order->size(); ++i) {
 165     RenderPassList::iterator to_take =
 166         render_passes_in_draw_order->begin() + i;
 167     render_passes_index_by_id_.insert(
 168         std::pair<RenderPass::Id, int>((*to_take)->id, i));
 169     scoped_ptr<RenderPass> taken_render_pass =
 170         render_passes_in_draw_order->take(to_take);
 171     render_passes_in_draw_order_.push_back(taken_render_pass.Pass());
 172   }
 173
 174   // Give back an empty array instead of nulls.
 175   render_passes_in_draw_order->clear();
 176 }
 177
 178 void DelegatedRendererLayerImpl::ClearRenderPasses() {
 179   render_passes_index_by_id_.clear();
 180   render_passes_in_draw_order_.clear();
 181 }
 182
 183 scoped_ptr<LayerImpl> DelegatedRendererLayerImpl::CreateLayerImpl(
 184     LayerTreeImpl* tree_impl) {
 185   return DelegatedRendererLayerImpl::Create(
 186       tree_impl, id()).PassAs<LayerImpl>();
 187 }
 188
 189 void DelegatedRendererLayerImpl::ReleaseResources() {
 190   ClearRenderPasses();
 191   ClearChildId();
 192 }
 193
 194 static inline int IndexToId(int index) { return index + 1; }
 195 static inline int IdToIndex(int id) { return id - 1; }
 196
 197 RenderPass::Id DelegatedRendererLayerImpl::FirstContributingRenderPassId()
 198     const {
 199   return RenderPass::Id(id(), IndexToId(0));
 200 }
 201
 202 RenderPass::Id DelegatedRendererLayerImpl::NextContributingRenderPassId(
 203     RenderPass::Id previous) const {
 204   return RenderPass::Id(previous.layer_id, previous.index + 1);
 205 }
 206
 207 bool DelegatedRendererLayerImpl::ConvertDelegatedRenderPassId(
 208     RenderPass::Id delegated_render_pass_id,
 209     RenderPass::Id* output_render_pass_id) const {
 210   base::hash_map<RenderPass::Id, int>::const_iterator found =
 211       render_passes_index_by_id_.find(delegated_render_pass_id);
 212   if (found == render_passes_index_by_id_.end()) {
 213     // Be robust against a RenderPass id that isn't part of the frame.
 214     return false;
 215   }
 216   unsigned delegated_render_pass_index = found->second;
 217   *output_render_pass_id =
 218       RenderPass::Id(id(), IndexToId(delegated_render_pass_index));
 219   return true;
 220 }
 221
 222 void DelegatedRendererLayerImpl::AppendContributingRenderPasses(
 223     RenderPassSink* render_pass_sink) {
 224   DCHECK(HasContributingDelegatedRenderPasses());
 225
 226   const RenderPass* root_delegated_render_pass =
 227       render_passes_in_draw_order_.back();
 228   gfx::Size frame_size = root_delegated_render_pass->output_rect.size();
 229   gfx::Transform delegated_frame_to_root_transform = screen_space_transform();
 230   delegated_frame_to_root_transform.Scale(inverse_device_scale_factor_,
 231                                           inverse_device_scale_factor_);
 232
 233   for (size_t i = 0; i < render_passes_in_draw_order_.size() - 1; ++i) {
 234     RenderPass::Id output_render_pass_id(-1, -1);
 235     bool present =
 236         ConvertDelegatedRenderPassId(render_passes_in_draw_order_[i]->id,
 237                                      &output_render_pass_id);
 238
 239     // Don't clash with the RenderPass we generate if we own a RenderSurface.
 240     DCHECK(present) << render_passes_in_draw_order_[i]->id.layer_id << ", "
 241                     << render_passes_in_draw_order_[i]->id.index;
 242     DCHECK_GT(output_render_pass_id.index, 0);
 243
 244     scoped_ptr<RenderPass> copy_pass =
 245         render_passes_in_draw_order_[i]->Copy(output_render_pass_id);
 246     copy_pass->transform_to_root_target.ConcatTransform(
 247         delegated_frame_to_root_transform);
 248     render_pass_sink->AppendRenderPass(copy_pass.Pass());
 249   }
 250 }
 251
 252 bool DelegatedRendererLayerImpl::WillDraw(DrawMode draw_mode,
 253                                           ResourceProvider* resource_provider) {
 254   if (draw_mode == DRAW_MODE_RESOURCELESS_SOFTWARE)
 255     return false;
 256   return LayerImpl::WillDraw(draw_mode, resource_provider);
 257 }
 258
 259 void DelegatedRendererLayerImpl::AppendQuads(
 260     RenderPass* render_pass,
 261     const OcclusionTracker<LayerImpl>& occlusion_tracker,
 262     AppendQuadsData* append_quads_data) {
 263   AppendRainbowDebugBorder(render_pass, append_quads_data);
 264
 265   // This list will be empty after a lost context until a new frame arrives.
 266   if (render_passes_in_draw_order_.empty())
 267     return;
 268
 269   RenderPass::Id target_render_pass_id = append_quads_data->render_pass_id;
 270
 271   const RenderPass* root_delegated_render_pass =
 272       render_passes_in_draw_order_.back();
 273
 274   DCHECK(root_delegated_render_pass->output_rect.origin().IsOrigin());
 275   gfx::Size frame_size = root_delegated_render_pass->output_rect.size();
 276
 277   // If the index of the RenderPassId is 0, then it is a RenderPass generated
 278   // for a layer in this compositor, not the delegating renderer. Then we want
 279   // to merge our root RenderPass with the target RenderPass. Otherwise, it is
 280   // some RenderPass which we added from the delegating renderer.
 281   bool should_merge_root_render_pass_with_target = !target_render_pass_id.index;
 282   if (should_merge_root_render_pass_with_target) {
 283     // Verify that the RenderPass we are appending to is created by our
 284     // render_target.
 285     DCHECK(target_render_pass_id.layer_id == render_target()->id());
 286
 287     AppendRenderPassQuads(render_pass,
 288                           occlusion_tracker,
 289                           append_quads_data,
 290                           root_delegated_render_pass,
 291                           frame_size);
 292   } else {
 293     // Verify that the RenderPass we are appending to was created by us.
 294     DCHECK(target_render_pass_id.layer_id == id());
 295
 296     int render_pass_index = IdToIndex(target_render_pass_id.index);
 297     const RenderPass* delegated_render_pass =
 298         render_passes_in_draw_order_[render_pass_index];
 299     AppendRenderPassQuads(render_pass,
 300                           occlusion_tracker,
 301                           append_quads_data,
 302                           delegated_render_pass,
 303                           frame_size);
 304   }
 305 }
 306
 307 void DelegatedRendererLayerImpl::AppendRainbowDebugBorder(
 308     RenderPass* render_pass,
 309     AppendQuadsData* append_quads_data) {
 310   if (!ShowDebugBorders())
 311     return;
 312
 313   SharedQuadState* shared_quad_state =
 314       render_pass->CreateAndAppendSharedQuadState();
 315   PopulateSharedQuadState(shared_quad_state);
 316
 317   SkColor color;
 318   float border_width;
 319   GetDebugBorderProperties(&color, &border_width);
 320
 321   SkColor colors[] = {
 322     0x80ff0000,  // Red.
 323     0x80ffa500,  // Orange.
 324     0x80ffff00,  // Yellow.
 325     0x80008000,  // Green.
 326     0x800000ff,  // Blue.
 327     0x80ee82ee,  // Violet.
 328   };
 329   const int kNumColors = arraysize(colors);
 330
 331   const int kStripeWidth = 300;
 332   const int kStripeHeight = 300;
 333
 334   for (size_t i = 0; ; ++i) {
 335     // For horizontal lines.
 336     int x =  kStripeWidth * i;
 337     int width = std::min(kStripeWidth, content_bounds().width() - x - 1);
 338
 339     // For vertical lines.
 340     int y = kStripeHeight * i;
 341     int height = std::min(kStripeHeight, content_bounds().height() - y - 1);
 342
 343     gfx::Rect top(x, 0, width, border_width);
 344     gfx::Rect bottom(x,
 345                      content_bounds().height() - border_width,
 346                      width,
 347                      border_width);
 348     gfx::Rect left(0, y, border_width, height);
 349     gfx::Rect right(content_bounds().width() - border_width,
 350                     y,
 351                     border_width,
 352                     height);
 353
 354     if (top.IsEmpty() && left.IsEmpty())
 355       break;
 356
 357     if (!top.IsEmpty()) {
 358       SolidColorDrawQuad* top_quad =
 359           render_pass->CreateAndAppendDrawQuad<SolidColorDrawQuad>();
 360       top_quad->SetNew(
 361           shared_quad_state, top, top, colors[i % kNumColors], false);
 362
 363       SolidColorDrawQuad* bottom_quad =
 364           render_pass->CreateAndAppendDrawQuad<SolidColorDrawQuad>();
 365       bottom_quad->SetNew(shared_quad_state,
 366                           bottom,
 367                           bottom,
 368                           colors[kNumColors - 1 - (i % kNumColors)],
 369                           false);
 370     }
 371     if (!left.IsEmpty()) {
 372       SolidColorDrawQuad* left_quad =
 373           render_pass->CreateAndAppendDrawQuad<SolidColorDrawQuad>();
 374       left_quad->SetNew(shared_quad_state,
 375                         left,
 376                         left,
 377                         colors[kNumColors - 1 - (i % kNumColors)],
 378                         false);
 379
 380       SolidColorDrawQuad* right_quad =
 381           render_pass->CreateAndAppendDrawQuad<SolidColorDrawQuad>();
 382       right_quad->SetNew(
 383           shared_quad_state, right, right, colors[i % kNumColors], false);
 384     }
 385   }
 386 }
 387
 388 void DelegatedRendererLayerImpl::AppendRenderPassQuads(
 389     RenderPass* render_pass,
 390     const OcclusionTracker<LayerImpl>& occlusion_tracker,
 391     AppendQuadsData* append_quads_data,
 392     const RenderPass* delegated_render_pass,
 393     const gfx::Size& frame_size) const {
 394   const SharedQuadState* delegated_shared_quad_state = NULL;
 395   SharedQuadState* output_shared_quad_state = NULL;
 396
 397   for (size_t i = 0; i < delegated_render_pass->quad_list.size(); ++i) {
 398     const DrawQuad* delegated_quad = delegated_render_pass->quad_list[i];
 399
 400     bool is_root_delegated_render_pass =
 401         delegated_render_pass == render_passes_in_draw_order_.back();
 402
 403     if (delegated_quad->shared_quad_state != delegated_shared_quad_state) {
 404       delegated_shared_quad_state = delegated_quad->shared_quad_state;
 405       output_shared_quad_state = render_pass->CreateAndAppendSharedQuadState();
 406       output_shared_quad_state->CopyFrom(delegated_shared_quad_state);
 407
 408       if (is_root_delegated_render_pass) {
 409         gfx::Transform delegated_frame_to_target_transform = draw_transform();
 410         delegated_frame_to_target_transform.Scale(inverse_device_scale_factor_,
 411                                                   inverse_device_scale_factor_);
 412
 413         output_shared_quad_state->content_to_target_transform.ConcatTransform(
 414             delegated_frame_to_target_transform);
 415
 416         if (render_target() == this) {
 417           DCHECK(!is_clipped());
 418           DCHECK(render_surface());
 419           DCHECK_EQ(0, num_unclipped_descendants());
 420           output_shared_quad_state->clip_rect =
 421               MathUtil::MapEnclosingClippedRect(
 422                   delegated_frame_to_target_transform,
 423                   output_shared_quad_state->clip_rect);
 424         } else {
 425           gfx::Rect clip_rect = drawable_content_rect();
 426           if (output_shared_quad_state->is_clipped) {
 427             clip_rect.Intersect(MathUtil::MapEnclosingClippedRect(
 428                 delegated_frame_to_target_transform,
 429                 output_shared_quad_state->clip_rect));
 430           }
 431           output_shared_quad_state->clip_rect = clip_rect;
 432           output_shared_quad_state->is_clipped = true;
 433         }
 434
 435         output_shared_quad_state->opacity *= draw_opacity();
 436       }
 437     }
 438     DCHECK(output_shared_quad_state);
 439
 440     gfx::Transform quad_content_to_delegated_target_space =
 441         output_shared_quad_state->content_to_target_transform;
 442     if (!is_root_delegated_render_pass) {
 443       quad_content_to_delegated_target_space.ConcatTransform(
 444           render_pass->transform_to_root_target);
 445       quad_content_to_delegated_target_space.ConcatTransform(draw_transform());
 446     }
 447
 448     gfx::Rect quad_visible_rect = occlusion_tracker.UnoccludedContentRect(
 449         delegated_quad->visible_rect, quad_content_to_delegated_target_space);
 450
 451     if (quad_visible_rect.IsEmpty())
 452       continue;
 453
 454     if (delegated_quad->material != DrawQuad::RENDER_PASS) {
 455       DrawQuad* output_quad = render_pass->CopyFromAndAppendDrawQuad(
 456           delegated_quad, output_shared_quad_state);
 457       output_quad->visible_rect = quad_visible_rect;
 458     } else {
 459       RenderPass::Id delegated_contributing_render_pass_id =
 460           RenderPassDrawQuad::MaterialCast(delegated_quad)->render_pass_id;
 461       RenderPass::Id output_contributing_render_pass_id(-1, -1);
 462
 463       bool present =
 464           ConvertDelegatedRenderPassId(delegated_contributing_render_pass_id,
 465                                        &output_contributing_render_pass_id);
 466
 467       // The frame may have a RenderPassDrawQuad that points to a RenderPass not
 468       // part of the frame. Just ignore these quads.
 469       if (present) {
 470         DCHECK(output_contributing_render_pass_id !=
 471                append_quads_data->render_pass_id);
 472
 473         RenderPassDrawQuad* output_quad =
 474             render_pass->CopyFromAndAppendRenderPassDrawQuad(
 475                 RenderPassDrawQuad::MaterialCast(delegated_quad),
 476                 output_shared_quad_state,
 477                 output_contributing_render_pass_id);
 478         output_quad->visible_rect = quad_visible_rect;
 479       }
 480     }
 481   }
 482 }
 483
 484 const char* DelegatedRendererLayerImpl::LayerTypeAsString() const {
 485   return "cc::DelegatedRendererLayerImpl";
 486 }
 487
 488 void DelegatedRendererLayerImpl::ClearChildId() {
 489   if (!child_id_)
 490     return;
 491
 492   if (own_child_id_) {
 493     ResourceProvider* provider = layer_tree_impl()->resource_provider();
 494     provider->DestroyChild(child_id_);
 495   }
 496
 497   resources_.clear();
 498   child_id_ = 0;
 499 }
 500
 501 }  // namespace cc