cc: Trigger GPU rasterization based on a per-layer hint

cc/layers/picture_layer.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/layers/picture_layer.h"
 
 #include "cc/layers/content_layer_client.h"
 #include "cc/layers/picture_layer_impl.h"
 #include "cc/trees/layer_tree_impl.h"
 #include "ui/gfx/rect_conversions.h"
 
 namespace cc {
 
 scoped_refptr<PictureLayer> PictureLayer::Create(ContentLayerClient* client) {
   return make_scoped_refptr(new PictureLayer(client));
 }
 
 PictureLayer::PictureLayer(ContentLayerClient* client)
   : client_(client),
     pile_(make_scoped_refptr(new PicturePile())),
     instrumentation_object_tracker_(id()),
     is_mask_(false),
+    has_gpu_rasterization_hint_(false),
     update_source_frame_number_(-1) {
 }
 
 PictureLayer::~PictureLayer() {
 }
 
 bool PictureLayer::DrawsContent() const {
   return Layer::DrawsContent() && client_;
 }
 
@@ skipping 11 matching lines @@
     // may disagree and either one could have been pushed to layer_impl.
     pile_->Resize(gfx::Size());
     pile_->UpdateRecordedRegion();
   } else if (update_source_frame_number_ ==
              layer_tree_host()->source_frame_number()) {
     // If update called, then pile size must match bounds pushed to impl layer.
     DCHECK_EQ(layer_impl->bounds().ToString(), pile_->size().ToString());
   }
 
   layer_impl->SetIsMask(is_mask_);
+  layer_impl->SetHasGpuRasterizationHint(has_gpu_rasterization_hint_);
+
   // Unlike other properties, invalidation must always be set on layer_impl.
   // See PictureLayerImpl::PushPropertiesTo for more details.
   layer_impl->invalidation_.Clear();
   layer_impl->invalidation_.Swap(&pile_invalidation_);
   layer_impl->pile_ = PicturePileImpl::CreateFromOther(pile_.get());
 }
 
 void PictureLayer::SetLayerTreeHost(LayerTreeHost* host) {
   Layer::SetLayerTreeHost(host);
   if (host) {
@@ skipping 63 matching lines @@
     pile_invalidation_.Clear();
   }
 
   return updated;
 }
 
 void PictureLayer::SetIsMask(bool is_mask) {
   is_mask_ = is_mask;
 }
 
+void PictureLayer::SetHasGpuRasterizationHint(bool has_hint) {
+  DCHECK(IsPropertyChangeAllowed());
+  if (has_gpu_rasterization_hint_ == has_hint)
+    return;
+  has_gpu_rasterization_hint_ = has_hint;
+  SetNeedsCommit();
+}
+
 bool PictureLayer::SupportsLCDText() const {
   return true;
 }
 
 skia::RefPtr<SkPicture> PictureLayer::GetPicture() const {
   // We could either flatten the PicturePile into a single SkPicture,
   // or paint a fresh one depending on what we intend to do with the
   // picture. For now we just paint a fresh one to get consistent results.
   if (!DrawsContent())
     return skia::RefPtr<SkPicture>();
 
   int width = bounds().width();
   int height = bounds().height();
   gfx::RectF opaque;
 
   skia::RefPtr<SkPicture> picture = skia::AdoptRef(new SkPicture);
   SkCanvas* canvas = picture->beginRecording(width, height);
   client_->PaintContents(canvas, gfx::Rect(width, height), &opaque);
   picture->endRecording();
   return picture;
 }
 
 void PictureLayer::RunMicroBenchmark(MicroBenchmark* benchmark) {
   benchmark->RunOnLayer(this);
 }
 
 }  // namespace cc