Initial surface aggregator implementation

cc/surfaces/surface_aggregator.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "cc/surfaces/surface_aggregator.h"
+
+#include "base/containers/hash_tables.h"
+#include "base/logging.h"
+#include "cc/output/compositor_frame.h"
+#include "cc/output/delegated_frame_data.h"
+#include "cc/quads/draw_quad.h"
+#include "cc/quads/render_pass_draw_quad.h"
+#include "cc/quads/shared_quad_state.h"
+#include "cc/quads/surface_draw_quad.h"
+#include "cc/surfaces/surface.h"
+#include "cc/surfaces/surface_manager.h"
+
+namespace cc {
+
+SurfaceAggregator::SurfaceAggregator(SurfaceManager* manager)
+    : manager_(manager) {
+  DCHECK(manager_);
+}
+
+SurfaceAggregator::~SurfaceAggregator() {}
+
+DelegatedFrameData* SurfaceAggregator::GetReferencedDataForSurfaceID(
+    int surface_id) {
+  Surface* referenced_surface = manager_->GetSurfaceForID(surface_id);
+  if (!referenced_surface)
+    return NULL;  // Invalid surface id, skip this quad.
+  CompositorFrame* referenced_frame = referenced_surface->GetEligibleFrame();
+  if (!referenced_frame)
+    return NULL;
+  return referenced_frame->delegated_frame_data.get();
+}
+
+class SurfaceAggregator::RenderPassIdAllocator {
+ public:
+  explicit RenderPassIdAllocator(int surface_id)
+      : surface_id_(surface_id), next_index_(1) {}
+  ~RenderPassIdAllocator() {}
+
+  void AddKnownPass(RenderPass::Id id) {
+    if (id_to_index_map_.find(id) != id_to_index_map_.end())
+      return;
+    id_to_index_map_[id] = next_index_++;
+  }
+
+  RenderPass::Id Remap(RenderPass::Id id) {
+    DCHECK(id_to_index_map_.find(id) != id_to_index_map_.end());
+    return RenderPass::Id(surface_id_, id_to_index_map_[id]);
+  }
+
+ private:
+  base::hash_map<RenderPass::Id, int> id_to_index_map_;
+  int surface_id_;
+  int next_index_;
+
+  DISALLOW_COPY_AND_ASSIGN(RenderPassIdAllocator);
+};
+
+RenderPass::Id SurfaceAggregator::RemapPassId(
+    RenderPass::Id surface_local_pass_id,
+    int surface_id) {
+  RenderPassIdAllocator* allocator = render_pass_allocator_map_.get(surface_id);
+  if (!allocator) {
+    allocator = new RenderPassIdAllocator(surface_id);
+    render_pass_allocator_map_.set(surface_id, make_scoped_ptr(allocator));
+  }
+  allocator->AddKnownPass(surface_local_pass_id);
+  return allocator->Remap(surface_local_pass_id);
+}
+
+void SurfaceAggregator::HandleSurfaceQuad(const SurfaceDrawQuad* surface_quad,
+                                          RenderPass* dest_pass) {
+  int surface_id = surface_quad->surface_id;
+  // If this surface's id is already in our referenced set then it creates
+  // a cycle in the graph and should be dropped.
+  if (referenced_surfaces_.count(surface_id))
+    return;
+  DelegatedFrameData* referenced_data =
+      GetReferencedDataForSurfaceID(surface_id);
+  if (!referenced_data)
+    return;
+  std::set<int>::iterator it = referenced_surfaces_.insert(surface_id).first;
+
+  const RenderPassList& referenced_passes = referenced_data->render_pass_list;
+  for (size_t j = 0; j + 1 < referenced_passes.size(); ++j) {
+    const RenderPass& source = *referenced_passes[j];
+
+    scoped_ptr<RenderPass> copy_pass(RenderPass::Create());
+
+    RenderPass::Id remapped_pass_id = RemapPassId(source.id, surface_id);
+
+    copy_pass->SetAll(remapped_pass_id,
+                      source.output_rect,
+                      source.damage_rect,
+                      source.transform_to_root_target,
+                      source.has_transparent_background);
+
+    CopyQuadsToPass(source.quad_list,
+                    source.shared_quad_state_list,
+                    copy_pass.get(),
+                    surface_id);
+
+    dest_pass_list_->push_back(copy_pass.Pass());
+  }
+
+  // TODO(jamesr): Clean up last pass special casing.
+  const RenderPass& last_pass = *referenced_data->render_pass_list.back();
+  const QuadList& quads = last_pass.quad_list;
+
+  for (size_t j = 0; j < last_pass.shared_quad_state_list.size(); ++j) {
+    dest_pass->shared_quad_state_list.push_back(
+        last_pass.shared_quad_state_list[j]->Copy());
+  }
+  // TODO(jamesr): Map transform correctly for quads in the referenced
+  // surface into this pass's space.
+  // TODO(jamesr): Make sure clipping is enforced.
+  CopyQuadsToPass(
+      quads, last_pass.shared_quad_state_list, dest_pass, surface_id);
+
+  referenced_surfaces_.erase(it);
+}
+
+void SurfaceAggregator::CopyQuadsToPass(
+    const QuadList& source_quad_list,
+    const SharedQuadStateList& source_shared_quad_state_list,
+    RenderPass* dest_pass,
+    int surface_id) {
+  for (size_t j = 0; j < source_shared_quad_state_list.size(); ++j) {
+    dest_pass->shared_quad_state_list.push_back(
+        source_shared_quad_state_list[j]->Copy());
+  }
+
+  for (size_t i = 0, sqs_i = 0; i < source_quad_list.size(); ++i) {
+    DrawQuad* quad = source_quad_list[i];
+
+    while (quad->shared_quad_state != source_shared_quad_state_list[sqs_i]) {
+      ++sqs_i;
+      DCHECK_LT(sqs_i, source_shared_quad_state_list.size());
+      DCHECK_LT(sqs_i, dest_pass->shared_quad_state_list.size());
+    }
+    DCHECK_EQ(quad->shared_quad_state, source_shared_quad_state_list[sqs_i]);
+
+    if (quad->material == DrawQuad::SURFACE_CONTENT) {
+      const SurfaceDrawQuad* surface_quad = SurfaceDrawQuad::MaterialCast(quad);
+      HandleSurfaceQuad(surface_quad, dest_pass);
+    } else if (quad->material == DrawQuad::RENDER_PASS) {
+      const RenderPassDrawQuad* pass_quad =
+          RenderPassDrawQuad::MaterialCast(quad);
+      RenderPass::Id original_pass_id = pass_quad->render_pass_id;
+      RenderPass::Id remapped_pass_id =
+          RemapPassId(original_pass_id, surface_id);
+
+      dest_pass->quad_list.push_back(
+          pass_quad->Copy(dest_pass->shared_quad_state_list[sqs_i],
+                          remapped_pass_id).PassAs<DrawQuad>());
+    } else {
+      dest_pass->quad_list.push_back(
+          quad->Copy(dest_pass->shared_quad_state_list[sqs_i]));
+    }
+  }
+}
+
+void SurfaceAggregator::CopyPasses(const RenderPassList& source_pass_list,
+                                   int surface_id) {
+  for (size_t i = 0; i < source_pass_list.size(); ++i) {
+    const RenderPass& source = *source_pass_list[i];
+
+    scoped_ptr<RenderPass> copy_pass(RenderPass::Create());
+
+    RenderPass::Id remapped_pass_id = RemapPassId(source.id, surface_id);
+
+    copy_pass->SetAll(remapped_pass_id,
+                      source.output_rect,
+                      source.damage_rect,
+                      source.transform_to_root_target,
+                      source.has_transparent_background);
+
+    CopyQuadsToPass(source.quad_list,
+                    source.shared_quad_state_list,
+                    copy_pass.get(),
+                    surface_id);
+
+    dest_pass_list_->push_back(copy_pass.Pass());
+  }
+}
+
+scoped_ptr<CompositorFrame> SurfaceAggregator::Aggregate(int surface_id) {
+  Surface* surface = manager_->GetSurfaceForID(surface_id);
+  if (!surface)
+    return scoped_ptr<CompositorFrame>();
+  CompositorFrame* root_surface_frame = surface->GetEligibleFrame();
+  if (!root_surface_frame)
+    return scoped_ptr<CompositorFrame>();
+
+  scoped_ptr<CompositorFrame> frame(new CompositorFrame);
+  frame->delegated_frame_data = make_scoped_ptr(new DelegatedFrameData);
+
+  DCHECK(root_surface_frame->delegated_frame_data);
+
+  const RenderPassList& source_pass_list =
+      root_surface_frame->delegated_frame_data->render_pass_list;
+
+  referenced_surfaces_.insert(surface_id);
+
+  dest_pass_list_ = &frame->delegated_frame_data->render_pass_list;
+  CopyPasses(source_pass_list, surface_id);
+
+  referenced_surfaces_.clear();
+  dest_pass_list_ = NULL;
+
+  // TODO(jamesr): Aggregate all resource references into the returned frame's
+  // resource list.
+
+  return frame.Pass();
+}
+
+}  // namespace cc