Track the cost of impl-side painting.

cc/picture_pile_impl.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 "base/debug/trace_event.h"
 #include "cc/picture_pile_impl.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 
 namespace cc {
 
 scoped_refptr<PicturePileImpl> PicturePileImpl::Create() {
   return make_scoped_refptr(new PicturePileImpl());
 }
 
-PicturePileImpl::PicturePileImpl() {
+PicturePileImpl::PicturePileImpl() :
+  rasterize_time_in_seconds_(0) {
 }
 
 PicturePileImpl::~PicturePileImpl() {
 }
 
 scoped_refptr<PicturePileImpl> PicturePileImpl::CloneForDrawing() const {
   TRACE_EVENT0("cc", "PicturePileImpl::CloneForDrawing");
   scoped_refptr<PicturePileImpl> clone = Create();
   clone->pile_.resize(pile_.size());
   for (size_t i = 0; i < pile_.size(); ++i)
     clone->pile_[i] = pile_[i]->Clone();
 
   return clone;
 }
 
 void PicturePileImpl::Raster(SkCanvas* canvas, gfx::Rect rect) {

[nduca, 2012/11/29 18:16:30]

Lets pass in a ref to Stats object and accumulate on it. Then tile_manager can
have a stats object. Then TileManager::renderingStats() can copy the relevant
fields to the passed-in reingeringStats pointer.

[Tom Hudson, 2012/11/29 19:16:11]

I hit "Done" when I was working in PicturePileImpl, but then I got to
TileManager. RasterizeTile is not a member function, and it's running in the
other thread. How do we do this safely?

[reveman, 2012/11/29 19:27:03]

you can allocate storage for the stat in TileManager::DispatchOneRasterTask,
pass a pointer to RasterizeTile, then collect the result and free the storage in
TileManager::OnRasterTaskCompleted.

+  base::TimeTicks rasterizeBeginTime = base::TimeTicks::Now();
+
   // TODO(enne): do this more efficiently, i.e. top down with Skia clips
   canvas->save();
   canvas->translate(-rect.x(), -rect.y());
   SkRect layer_skrect = SkRect::MakeXYWH(rect.x(), rect.y(),
                                          rect.width(), rect.height());
   canvas->clipRect(layer_skrect);
   for (size_t i = 0; i < pile_.size(); ++i) {
     if (!pile_[i]->LayerRect().Intersects(rect))
       continue;
     pile_[i]->Raster(canvas);
   }
   canvas->restore();
+
+  rasterize_time_in_seconds_ += (base::TimeTicks::Now() - rasterizeBeginTime).InSecondsF();
+}
+
+double PicturePileImpl::rasterizeTime() {
+  return rasterize_time_in_seconds_;
 }
 
 }  // namespace cc