cc: Rasterize cheap tiles immediately

cc/tile_manager.cc

 // Copyright 2012 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/tile_manager.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
@@ skipping 176 matching lines @@
     bool use_cheapness_estimator)
     : client_(client),
       resource_pool_(ResourcePool::Create(resource_provider)),
       raster_worker_pool_(RasterWorkerPool::Create(this, num_raster_threads)),
       manage_tiles_pending_(false),
       manage_tiles_call_count_(0),
       bytes_pending_set_pixels_(0),
       has_performed_uploads_since_last_flush_(false),
       ever_exceeded_memory_budget_(false),
       record_rendering_stats_(false),
-      use_cheapness_estimator_(use_cheapness_estimator) {
+      use_cheapness_estimator_(use_cheapness_estimator),
+      allow_cheap_tasks_(true),
+      did_schedule_cheap_tasks_(false) {
   for (int i = 0; i < NUM_STATES; ++i) {
     for (int j = 0; j < NUM_TREES; ++j) {
       for (int k = 0; k < NUM_BINS; ++k)
         raster_state_count_[i][j][k] = 0;
     }
   }
 }
 
 TileManager::~TileManager() {
   // Reset global state and manage. This should cause
@@ skipping 234 matching lines @@
     managed_tile_state.can_be_freed = true;
     managed_tile_state.can_use_gpu_memory = false;
     FreeResourcesForTile(tile);
 
     bytes_pending_set_pixels_ -= tile->bytes_consumed_if_allocated();
     DidTileRasterStateChange(tile, IDLE_STATE);
     tiles_with_pending_set_pixels_.pop();
   }
 }
 
+void TileManager::DidCompleteFrame() {
+  allow_cheap_tasks_ = true;
+  did_schedule_cheap_tasks_ = false;
+}
+
 void TileManager::GetMemoryStats(
     size_t* memoryRequiredBytes,
     size_t* memoryNiceToHaveBytes,
     size_t* memoryUsedBytes) const {
   *memoryRequiredBytes = 0;
   *memoryNiceToHaveBytes = 0;
   *memoryUsedBytes = 0;
   for (size_t i = 0; i < live_or_allocated_tiles_.size(); i++) {
     const Tile* tile = live_or_allocated_tiles_[i];
     const ManagedTileState& mts = tile->managed_state();
@@ skipping 177 matching lines @@
       tiles_that_need_to_be_rasterized_.end());
 }
 
 void TileManager::FreeResourcesForTile(Tile* tile) {
   ManagedTileState& managed_tile_state = tile->managed_state();
   DCHECK(managed_tile_state.can_be_freed);
   if (managed_tile_state.resource)
     resource_pool_->ReleaseResource(managed_tile_state.resource.Pass());
 }
 
-bool TileManager::CanDispatchRasterTask(Tile* tile) {
+bool TileManager::CanDispatchRasterTask(Tile* tile) const {
   if (raster_worker_pool_->IsBusy())
     return false;
   size_t new_bytes_pending = bytes_pending_set_pixels_;
   new_bytes_pending += tile->bytes_consumed_if_allocated();
   return new_bytes_pending <= kMaxPendingUploadBytes &&
          tiles_with_pending_set_pixels_.size() < kMaxPendingUploads;
 }
 
 void TileManager::DispatchMoreTasks() {
+  if (did_schedule_cheap_tasks_)
+    allow_cheap_tasks_ = false;
+
   // Because tiles in the image decoding list have higher priorities, we
   // need to process those tiles first before we start to handle the tiles
   // in the need_to_be_rasterized queue.
   for(TileList::iterator it = tiles_with_image_decoding_tasks_.begin();
       it != tiles_with_image_decoding_tasks_.end(); ) {
     DispatchImageDecodeTasksForTile(*it);
     ManagedTileState& managed_state = (*it)->managed_state();
     if (managed_state.pending_pixel_refs.empty()) {
       if (!CanDispatchRasterTask(*it))
         return;
@@ skipping 113 matching lines @@
 
   DidTileRasterStateChange(tile, RASTER_STATE);
   return resource.Pass();
 }
 
 void TileManager::DispatchOneRasterTask(scoped_refptr<Tile> tile) {
   TRACE_EVENT0("cc", "TileManager::DispatchOneRasterTask");
   scoped_ptr<ResourcePool::Resource> resource = PrepareTileForRaster(tile);
   ResourceProvider::ResourceId resource_id = resource->id();
 
+  bool is_cheap = use_cheapness_estimator_ && allow_cheap_tasks_ &&
+      tile->picture_pile()->IsCheapInRect(tile->content_rect_,
+                                          tile->contents_scale());
   raster_worker_pool_->PostRasterTaskAndReply(
       tile->picture_pile(),
-      base::Bind(&TileManager::PerformRaster,
+      is_cheap,
+      base::Bind(&TileManager::RunRasterTask,
                  resource_pool_->resource_provider()->mapPixelBuffer(
                      resource_id),
                  tile->content_rect_,
                  tile->contents_scale(),
                  use_cheapness_estimator_,
                  GetRasterTaskMetadata(tile->managed_state())),
       base::Bind(&TileManager::OnRasterTaskCompleted,
                  base::Unretained(this),
                  tile,
                  base::Passed(&resource),
                  manage_tiles_call_count_));
+  did_schedule_cheap_tasks_ |= is_cheap;
 }
 
-void TileManager::PerformOneRaster(Tile* tile) {
-  scoped_ptr<ResourcePool::Resource> resource = PrepareTileForRaster(tile);
-  ResourceProvider::ResourceId resource_id = resource->id();
-
-  PerformRaster(resource_pool_->resource_provider()->mapPixelBuffer(
-                    resource_id),
-                tile->content_rect_,
-                tile->contents_scale(),
-                use_cheapness_estimator_,
-                GetRasterTaskMetadata(tile->managed_state()),
-                tile->picture_pile(),
-                &rendering_stats_);
-
-  OnRasterCompleted(tile, resource.Pass(), manage_tiles_call_count_);
-}
-
-void TileManager::OnRasterCompleted(
+void TileManager::OnRasterTaskCompleted(
     scoped_refptr<Tile> tile,
     scoped_ptr<ResourcePool::Resource> resource,
     int manage_tiles_call_count_when_dispatched) {
-  TRACE_EVENT0("cc", "TileManager::OnRasterCompleted");
+  TRACE_EVENT0("cc", "TileManager::OnRasterTaskCompleted");
 
   // Release raster resources.
   resource_pool_->resource_provider()->unmapPixelBuffer(resource->id());
 
   ManagedTileState& managed_tile_state = tile->managed_state();
   managed_tile_state.can_be_freed = true;
 
   // Tile can be freed after the completion of the raster task. Call
   // AssignGpuMemoryToTiles() to re-assign gpu memory to highest priority
   // tiles if ManageTiles() was called since task was dispatched. The result
@@ skipping 23 matching lines @@
     DidTileRasterStateChange(tile, SET_PIXELS_STATE);
     tiles_with_pending_set_pixels_.push(tile);
   } else {
     resource_pool_->resource_provider()->releasePixelBuffer(resource->id());
     resource_pool_->ReleaseResource(resource.Pass());
     managed_tile_state.resource_is_being_initialized = false;
     DidTileRasterStateChange(tile, IDLE_STATE);
   }
 }
 
-void TileManager::OnRasterTaskCompleted(
-    scoped_refptr<Tile> tile,
-    scoped_ptr<ResourcePool::Resource> resource,
-    int manage_tiles_call_count_when_dispatched) {
-  OnRasterCompleted(tile, resource.Pass(),
-                    manage_tiles_call_count_when_dispatched);
-}
-
 void TileManager::DidFinishTileInitialization(Tile* tile) {
   ManagedTileState& managed_tile_state = tile->managed_state();
   DCHECK(managed_tile_state.resource);
   managed_tile_state.resource_is_being_initialized = false;
   managed_tile_state.can_be_freed = true;
 }
 
 void TileManager::DidTileRasterStateChange(Tile* tile, TileRasterState state) {
   ManagedTileState& mts = tile->managed_state();
   DCHECK_LT(state, NUM_STATES);
@@ skipping 19 matching lines @@
   --raster_state_count_[mts.raster_state][tree][mts.tree_bin[tree]];
   DCHECK_GE(raster_state_count_[mts.raster_state][tree][mts.tree_bin[tree]], 0);
 
   // Increment count for new bin.
   ++raster_state_count_[mts.raster_state][tree][new_tree_bin];
 
   mts.tree_bin[tree] = new_tree_bin;
 }
 
 // static
-void TileManager::PerformRaster(uint8* buffer,
+void TileManager::RunRasterTask(uint8* buffer,
                                 const gfx::Rect& rect,
                                 float contents_scale,
                                 bool use_cheapness_estimator,
                                 const RasterTaskMetadata& raster_task_metadata,
                                 PicturePileImpl* picture_pile,
                                 RenderingStats* stats) {
   TRACE_EVENT2(
-      "cc", "TileManager::PerformRaster",
+      "cc", "TileManager::RunRasterTask",
       "is_on_pending_tree",
           raster_task_metadata.is_tile_in_pending_tree_now_bin,
       "is_low_res",
           raster_task_metadata.tile_resolution == LOW_RESOLUTION);
 
   DCHECK(picture_pile);
   DCHECK(buffer);
   SkBitmap bitmap;
   bitmap.setConfig(SkBitmap::kARGB_8888_Config, rect.width(), rect.height());
   bitmap.setPixels(buffer);
@@ skipping 17 matching lines @@
     if (raster_task_metadata.is_tile_in_pending_tree_now_bin)
       stats->totalRasterizeTimeForNowBinsOnPendingTree += duration;
 
     UMA_HISTOGRAM_CUSTOM_COUNTS("Renderer4.PictureRasterTimeMS",
                                 duration.InMilliseconds(),
                                 0,
                                 10,
                                 10);
 
     if (use_cheapness_estimator) {
-      bool is_predicted_cheap = picture_pile->IsCheapInRect (rect, contents_scale);
+      bool is_predicted_cheap =
+          picture_pile->IsCheapInRect(rect, contents_scale);
       bool is_actually_cheap = duration.InMillisecondsF() <= 1.0f;
       RecordCheapnessPredictorResults(is_predicted_cheap, is_actually_cheap);
     }
   }
 }
 
 // static
 void TileManager::RecordCheapnessPredictorResults(bool is_predicted_cheap,
                                                   bool is_actually_cheap) {
   if (is_predicted_cheap && !is_actually_cheap)
@@ skipping 14 matching lines @@
     decode_begin_time = base::TimeTicks::HighResNow();
   pixel_ref->Decode();
   if (stats) {
     stats->totalDeferredImageDecodeCount++;
     stats->totalDeferredImageDecodeTime +=
         base::TimeTicks::HighResNow() - decode_begin_time;
   }
 }
 
 }  // namespace cc