cc: GPU rasterize tiles synchronously in PrepareToDraw

cc/trees/layer_tree_host_impl.cc

 // Copyright 2011 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/trees/layer_tree_host_impl.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/basictypes.h"
@@ skipping 294 matching lines @@
   if (pending_tree_)
     pending_tree_->ApplyScrollDeltasSinceBeginMainFrame();
   sync_tree()->set_needs_update_draw_properties();
 
   if (settings_.impl_side_painting) {
     // Impl-side painting needs an update immediately post-commit to have the
     // opportunity to create tilings.  Other paths can call UpdateDrawProperties
     // more lazily when needed prior to drawing.
     sync_tree()->UpdateDrawProperties();
     // Start working on newly created tiles immediately if needed.
-    if (tile_manager_ && tile_priorities_dirty_)
+    if (tile_manager_ && tile_priorities_dirty_ && !use_gpu_rasterization_)
       ManageTiles();
     else
       NotifyReadyToActivate();
   } else {
     // If we're not in impl-side painting, the tree is immediately considered
     // active.
     ActivateSyncTree();
   }
 
   micro_benchmark_controller_.DidCompleteCommit();
@@ skipping 53 matching lines @@
 
 void LayerTreeHostImpl::Animate(base::TimeTicks monotonic_time) {
   if (input_handler_client_)
     input_handler_client_->Animate(monotonic_time);
   AnimatePageScale(monotonic_time);
   AnimateLayers(monotonic_time);
   AnimateScrollbars(monotonic_time);
   AnimateTopControls(monotonic_time);
 }
 
+void LayerTreeHostImpl::RasterizeTiles() {
+  if (!tile_manager_)
+    return;
+  if (!tile_priorities_dirty_)
+    return;
+
+  tile_priorities_dirty_ = false;
+  tile_manager_->RasterizeTiles(global_tile_state_);
+}
+
 void LayerTreeHostImpl::ManageTiles() {
   if (!tile_manager_)
     return;
   if (!tile_priorities_dirty_)
     return;
+  if (use_gpu_rasterization_)
+    return;
 
   tile_priorities_dirty_ = false;
   tile_manager_->ManageTiles(global_tile_state_);
 
   client_->DidManageTiles();
 }
 
 void LayerTreeHostImpl::StartPageScaleAnimation(
     const gfx::Vector2d& target_offset,
     bool anchor_point,
@@ skipping 659 matching lines @@
   // as part of the current frame being drawn.
   if (settings().impl_side_painting)
     tile_manager_->UpdateVisibleTiles();
 
   UMA_HISTOGRAM_CUSTOM_COUNTS(
       "Compositing.NumActiveLayers", active_tree_->NumLayers(), 1, 400, 20);
 
   bool ok = active_tree_->UpdateDrawProperties();
   DCHECK(ok) << "UpdateDrawProperties failed during draw";
 
+  if (use_gpu_rasterization_)
+    RasterizeTiles();
+
   frame->render_surface_layer_list = &active_tree_->RenderSurfaceLayerList();
   frame->render_passes.clear();
   frame->render_passes_by_id.clear();
   frame->will_draw_layers.clear();
   frame->has_no_damage = false;
 
   if (active_tree_->root_layer()) {
     gfx::Rect device_viewport_damage_rect = viewport_damage_rect_;
     viewport_damage_rect_ = gfx::Rect();
 
@@ skipping 773 matching lines @@
 
   // If we just became visible, we have to ensure that we draw high res tiles,
   // to prevent checkerboard/low res flashes.
   if (visible_)
     SetRequiresHighResToDraw();
   else
     EvictAllUIResources();
 
   // Evict tiles immediately if invisible since this tab may never get another
   // draw or timer tick.
-  if (!visible_)
+  if (!visible_ && !use_gpu_rasterization_)
     ManageTiles();
 
   if (!renderer_)
     return;
 
   renderer_->SetVisible(visible);
 }
 
 void LayerTreeHostImpl::SetNeedsAnimate() {
   NotifySwapPromiseMonitorsOfSetNeedsRedraw();
@@ skipping 73 matching lines @@
     pending_tree_->set_needs_update_draw_properties();
   client_->UpdateRendererCapabilitiesOnImplThread();
 }
 
 void LayerTreeHostImpl::CreateAndSetTileManager() {
   DCHECK(!tile_manager_);
   DCHECK(settings_.impl_side_painting);
   DCHECK(output_surface_);
   DCHECK(resource_provider_);
 
-  CreateResourceAndRasterWorkerPool(
-      &raster_worker_pool_, &resource_pool_, &staging_resource_pool_);
+  CreateResourceAndRasterWorkerPool(&raster_worker_pool_, &gpu_rasterizer_,
+                                    &resource_pool_, &staging_resource_pool_);
   DCHECK(raster_worker_pool_);
   DCHECK(resource_pool_);
 
   base::SingleThreadTaskRunner* task_runner =
       proxy_->HasImplThread() ? proxy_->ImplThreadTaskRunner()
                               : proxy_->MainThreadTaskRunner();
   DCHECK(task_runner);
   size_t scheduled_raster_task_limit =
       IsSynchronousSingleThreaded() ? std::numeric_limits<size_t>::max()
                                     : settings_.scheduled_raster_task_limit;
-  tile_manager_ = TileManager::Create(this,
-                                      task_runner,
-                                      resource_pool_.get(),
-                                      raster_worker_pool_->AsRasterizer(),
-                                      rendering_stats_instrumentation_,
-                                      scheduled_raster_task_limit);
+  tile_manager_ = TileManager::Create(
+      this, task_runner, resource_pool_.get(),
+      raster_worker_pool_->AsRasterizer(), gpu_rasterizer_.get(),
+      rendering_stats_instrumentation_, scheduled_raster_task_limit);
 
   UpdateTileManagerMemoryPolicy(ActualManagedMemoryPolicy());
 }
 
 void LayerTreeHostImpl::CreateResourceAndRasterWorkerPool(
     scoped_ptr<RasterWorkerPool>* raster_worker_pool,
+    scoped_ptr<GpuRasterizer>* gpu_rasterizer,
     scoped_ptr<ResourcePool>* resource_pool,
     scoped_ptr<ResourcePool>* staging_resource_pool) {
   base::SingleThreadTaskRunner* task_runner =
       proxy_->HasImplThread() ? proxy_->ImplThreadTaskRunner()
                               : proxy_->MainThreadTaskRunner();
   DCHECK(task_runner);
 
   ContextProvider* context_provider = output_surface_->context_provider();
   if (!context_provider) {
     *resource_pool =
@@ skipping 12 matching lines @@
     *resource_pool =
         ResourcePool::Create(resource_provider_.get(),
                              GL_TEXTURE_2D,
                              resource_provider_->best_texture_format());
 
     *raster_worker_pool =
         GpuRasterWorkerPool::Create(task_runner,
                                     context_provider,
                                     resource_provider_.get(),
                                     settings_.use_distance_field_text);
+
+    *gpu_rasterizer =
+        GpuRasterizer::Create(context_provider, resource_provider_.get(),
+                              settings_.use_distance_field_text);
+
     return;
   }
 
   if (GetRendererCapabilities().using_image) {
     unsigned image_target = GL_TEXTURE_2D;
 #if defined(OS_MACOSX)
     // GL_TEXTURE_RECTANGLE_ARB target is required by IOSurface backed images.
     DCHECK(context_provider->ContextCapabilities().gpu.texture_rectangle);
     image_target = GL_TEXTURE_RECTANGLE_ARB;
 #endif
@@ skipping 46 matching lines @@
       resource_provider_.get(),
       GetMaxTransferBufferUsageBytes(context_provider->ContextCapabilities(),
                                      settings_.renderer_settings.refresh_rate));
 }
 
 void LayerTreeHostImpl::DestroyTileManager() {
   tile_manager_ = nullptr;
   resource_pool_ = nullptr;
   staging_resource_pool_ = nullptr;
   raster_worker_pool_ = nullptr;
+  gpu_rasterizer_ = nullptr;
   single_thread_synchronous_task_graph_runner_ = nullptr;
 }
 
 bool LayerTreeHostImpl::UsePendingTreeForSync() const {
   // In impl-side painting, synchronize to the pending tree so that it has
   // time to raster before being displayed.
   return settings_.impl_side_painting;
 }
 
 bool LayerTreeHostImpl::IsSynchronousSingleThreaded() const {
@@ skipping 1394 matching lines @@
 }
 
 void LayerTreeHostImpl::UnregisterPictureLayerImpl(PictureLayerImpl* layer) {
   std::vector<PictureLayerImpl*>::iterator it =
       std::find(picture_layers_.begin(), picture_layers_.end(), layer);
   DCHECK(it != picture_layers_.end());
   picture_layers_.erase(it);
 }
 
 }  // namespace cc