src/cc/surfaces/surface_aggregator.cc

   1 // Copyright 2014 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/surfaces/surface_aggregator.h"
   6
   7 #include "base/containers/hash_tables.h"
   8 #include "base/logging.h"
   9 #include "cc/output/compositor_frame.h"
  10 #include "cc/output/delegated_frame_data.h"
  11 #include "cc/quads/draw_quad.h"
  12 #include "cc/quads/render_pass_draw_quad.h"
  13 #include "cc/quads/shared_quad_state.h"
  14 #include "cc/quads/surface_draw_quad.h"
  15 #include "cc/surfaces/surface.h"
  16 #include "cc/surfaces/surface_manager.h"
  17
  18 namespace cc {
  19
  20 SurfaceAggregator::SurfaceAggregator(SurfaceManager* manager)
  21     : manager_(manager) {
  22   DCHECK(manager_);
  23 }
  24
  25 SurfaceAggregator::~SurfaceAggregator() {}
  26
  27 DelegatedFrameData* SurfaceAggregator::GetReferencedDataForSurfaceID(
  28     int surface_id) {
  29   Surface* referenced_surface = manager_->GetSurfaceForID(surface_id);
  30   if (!referenced_surface)
  31     return NULL;  // Invalid surface id, skip this quad.
  32   CompositorFrame* referenced_frame = referenced_surface->GetEligibleFrame();
  33   if (!referenced_frame)
  34     return NULL;
  35   return referenced_frame->delegated_frame_data.get();
  36 }
  37
  38 class SurfaceAggregator::RenderPassIdAllocator {
  39  public:
  40   explicit RenderPassIdAllocator(int surface_id)
  41       : surface_id_(surface_id), next_index_(1) {}
  42   ~RenderPassIdAllocator() {}
  43
  44   void AddKnownPass(RenderPass::Id id) {
  45     if (id_to_index_map_.find(id) != id_to_index_map_.end())
  46       return;
  47     id_to_index_map_[id] = next_index_++;
  48   }
  49
  50   RenderPass::Id Remap(RenderPass::Id id) {
  51     DCHECK(id_to_index_map_.find(id) != id_to_index_map_.end());
  52     return RenderPass::Id(surface_id_, id_to_index_map_[id]);
  53   }
  54
  55  private:
  56   base::hash_map<RenderPass::Id, int> id_to_index_map_;
  57   int surface_id_;
  58   int next_index_;
  59
  60   DISALLOW_COPY_AND_ASSIGN(RenderPassIdAllocator);
  61 };
  62
  63 RenderPass::Id SurfaceAggregator::RemapPassId(
  64     RenderPass::Id surface_local_pass_id,
  65     int surface_id) {
  66   RenderPassIdAllocator* allocator = render_pass_allocator_map_.get(surface_id);
  67   if (!allocator) {
  68     allocator = new RenderPassIdAllocator(surface_id);
  69     render_pass_allocator_map_.set(surface_id, make_scoped_ptr(allocator));
  70   }
  71   allocator->AddKnownPass(surface_local_pass_id);
  72   return allocator->Remap(surface_local_pass_id);
  73 }
  74
  75 void SurfaceAggregator::HandleSurfaceQuad(const SurfaceDrawQuad* surface_quad,
  76                                           RenderPass* dest_pass) {
  77   int surface_id = surface_quad->surface_id;
  78   // If this surface's id is already in our referenced set then it creates
  79   // a cycle in the graph and should be dropped.
  80   if (referenced_surfaces_.count(surface_id))
  81     return;
  82   DelegatedFrameData* referenced_data =
  83       GetReferencedDataForSurfaceID(surface_id);
  84   if (!referenced_data)
  85     return;
  86   std::set<int>::iterator it = referenced_surfaces_.insert(surface_id).first;
  87
  88   const RenderPassList& referenced_passes = referenced_data->render_pass_list;
  89   for (size_t j = 0; j + 1 < referenced_passes.size(); ++j) {
  90     const RenderPass& source = *referenced_passes[j];
  91
  92     scoped_ptr<RenderPass> copy_pass(RenderPass::Create());
  93
  94     RenderPass::Id remapped_pass_id = RemapPassId(source.id, surface_id);
  95
  96     copy_pass->SetAll(remapped_pass_id,
  97                       source.output_rect,
  98                       source.damage_rect,
  99                       source.transform_to_root_target,
 100                       source.has_transparent_background);
 101
 102     // Contributing passes aggregated in to the pass list need to take the
 103     // transform of the surface quad into account to update their transform to
 104     // the root surface.
 105     // TODO(jamesr): Make sure this is sufficient for surfaces nested several
 106     // levels deep and add tests.
 107     copy_pass->transform_to_root_target.ConcatTransform(
 108         surface_quad->quadTransform());
 109
 110     CopyQuadsToPass(source.quad_list,
 111                     source.shared_quad_state_list,
 112                     gfx::Transform(),
 113                     copy_pass.get(),
 114                     surface_id);
 115
 116     dest_pass_list_->push_back(copy_pass.Pass());
 117   }
 118
 119   // TODO(jamesr): Clean up last pass special casing.
 120   const RenderPass& last_pass = *referenced_data->render_pass_list.back();
 121   const QuadList& quads = last_pass.quad_list;
 122
 123   // TODO(jamesr): Make sure clipping is enforced.
 124   CopyQuadsToPass(quads,
 125                   last_pass.shared_quad_state_list,
 126                   surface_quad->quadTransform(),
 127                   dest_pass,
 128                   surface_id);
 129
 130   referenced_surfaces_.erase(it);
 131 }
 132
 133 void SurfaceAggregator::CopySharedQuadState(
 134     const SharedQuadState& source_sqs,
 135     const gfx::Transform& content_to_target_transform,
 136     SharedQuadStateList* dest_sqs_list) {
 137   scoped_ptr<SharedQuadState> copy_shared_quad_state = source_sqs.Copy();
 138   // content_to_target_transform contains any transformation that may exist
 139   // between the context that these quads are being copied from (i.e. the
 140   // surface's draw transform when aggregated from within a surface) to the
 141   // target space of the pass. This will be identity except when copying the
 142   // root draw pass from a surface into a pass when the surface draw quad's
 143   // transform is not identity.
 144   copy_shared_quad_state->content_to_target_transform.ConcatTransform(
 145       content_to_target_transform);
 146   dest_sqs_list->push_back(copy_shared_quad_state.Pass());
 147 }
 148
 149 void SurfaceAggregator::CopyQuadsToPass(
 150     const QuadList& source_quad_list,
 151     const SharedQuadStateList& source_shared_quad_state_list,
 152     const gfx::Transform& content_to_target_transform,
 153     RenderPass* dest_pass,
 154     int surface_id) {
 155   const SharedQuadState* last_copied_source_shared_quad_state = NULL;
 156
 157   for (size_t i = 0, sqs_i = 0; i < source_quad_list.size(); ++i) {
 158     DrawQuad* quad = source_quad_list[i];
 159     while (quad->shared_quad_state != source_shared_quad_state_list[sqs_i]) {
 160       ++sqs_i;
 161       DCHECK_LT(sqs_i, source_shared_quad_state_list.size());
 162     }
 163     DCHECK_EQ(quad->shared_quad_state, source_shared_quad_state_list[sqs_i]);
 164
 165     if (quad->material == DrawQuad::SURFACE_CONTENT) {
 166       const SurfaceDrawQuad* surface_quad = SurfaceDrawQuad::MaterialCast(quad);
 167       HandleSurfaceQuad(surface_quad, dest_pass);
 168     } else {
 169       if (quad->shared_quad_state != last_copied_source_shared_quad_state) {
 170         CopySharedQuadState(*quad->shared_quad_state,
 171                             content_to_target_transform,
 172                             &dest_pass->shared_quad_state_list);
 173         last_copied_source_shared_quad_state = quad->shared_quad_state;
 174       }
 175       if (quad->material == DrawQuad::RENDER_PASS) {
 176         const RenderPassDrawQuad* pass_quad =
 177             RenderPassDrawQuad::MaterialCast(quad);
 178         RenderPass::Id original_pass_id = pass_quad->render_pass_id;
 179         RenderPass::Id remapped_pass_id =
 180             RemapPassId(original_pass_id, surface_id);
 181
 182         dest_pass->quad_list.push_back(
 183             pass_quad->Copy(dest_pass->shared_quad_state_list.back(),
 184                             remapped_pass_id).PassAs<DrawQuad>());
 185       } else {
 186         dest_pass->quad_list.push_back(
 187             quad->Copy(dest_pass->shared_quad_state_list.back()));
 188       }
 189     }
 190   }
 191 }
 192
 193 void SurfaceAggregator::CopyPasses(const RenderPassList& source_pass_list,
 194                                    int surface_id) {
 195   for (size_t i = 0; i < source_pass_list.size(); ++i) {
 196     const RenderPass& source = *source_pass_list[i];
 197
 198     scoped_ptr<RenderPass> copy_pass(RenderPass::Create());
 199
 200     RenderPass::Id remapped_pass_id = RemapPassId(source.id, surface_id);
 201
 202     copy_pass->SetAll(remapped_pass_id,
 203                       source.output_rect,
 204                       source.damage_rect,
 205                       source.transform_to_root_target,
 206                       source.has_transparent_background);
 207
 208     CopyQuadsToPass(source.quad_list,
 209                     source.shared_quad_state_list,
 210                     gfx::Transform(),
 211                     copy_pass.get(),
 212                     surface_id);
 213
 214     dest_pass_list_->push_back(copy_pass.Pass());
 215   }
 216 }
 217
 218 scoped_ptr<CompositorFrame> SurfaceAggregator::Aggregate(int surface_id) {
 219   Surface* surface = manager_->GetSurfaceForID(surface_id);
 220   if (!surface)
 221     return scoped_ptr<CompositorFrame>();
 222   CompositorFrame* root_surface_frame = surface->GetEligibleFrame();
 223   if (!root_surface_frame)
 224     return scoped_ptr<CompositorFrame>();
 225
 226   scoped_ptr<CompositorFrame> frame(new CompositorFrame);
 227   frame->delegated_frame_data = make_scoped_ptr(new DelegatedFrameData);
 228
 229   DCHECK(root_surface_frame->delegated_frame_data);
 230
 231   const RenderPassList& source_pass_list =
 232       root_surface_frame->delegated_frame_data->render_pass_list;
 233
 234   std::set<int>::iterator it = referenced_surfaces_.insert(surface_id).first;
 235
 236   dest_pass_list_ = &frame->delegated_frame_data->render_pass_list;
 237   CopyPasses(source_pass_list, surface_id);
 238
 239   referenced_surfaces_.erase(it);
 240   DCHECK(referenced_surfaces_.empty());
 241
 242   dest_pass_list_ = NULL;
 243
 244   // TODO(jamesr): Aggregate all resource references into the returned frame's
 245   // resource list.
 246
 247   return frame.Pass();
 248 }
 249
 250 }  // namespace cc