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/debug/devtools_instrumentation.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) {
}

PictureLayer::~PictureLayer() {
}

bool PictureLayer::DrawsContent() const {
  return Layer::DrawsContent() && client_;
}

scoped_ptr<LayerImpl> PictureLayer::CreateLayerImpl(LayerTreeImpl* tree_impl) {
  return PictureLayerImpl::Create(tree_impl, id()).PassAs<LayerImpl>();
}

void PictureLayer::PushPropertiesTo(LayerImpl* base_layer) {
  Layer::PushPropertiesTo(base_layer);

  PictureLayerImpl* layer_impl = static_cast<PictureLayerImpl*>(base_layer);
  layer_impl->SetIsMask(is_mask_);
  layer_impl->CreateTilingSet();
  layer_impl->invalidation_.Clear();
  layer_impl->invalidation_.Swap(pile_invalidation_);
  layer_impl->pile_ = PicturePileImpl::CreateFromOther(pile_);

  layer_impl->SyncFromActiveLayer();
}

void PictureLayer::SetLayerTreeHost(LayerTreeHost* host) {
  Layer::SetLayerTreeHost(host);
  if (host) {
    pile_->SetMinContentsScale(host->settings().minimumContentsScale);
    pile_->SetTileGridSize(host->settings().defaultTileSize);
    pile_->set_num_raster_threads(host->settings().numRasterThreads);
    pile_->set_slow_down_raster_scale_factor(
        host->debug_state().slowDownRasterScaleFactor);
  }
}

void PictureLayer::SetNeedsDisplayRect(const gfx::RectF& layer_rect) {
  gfx::Rect rect = gfx::ToEnclosedRect(layer_rect);
  if (!rect.IsEmpty()) {
    // Clamp invalidation to the layer bounds.
    rect.Intersect(gfx::Rect(bounds()));
    pending_invalidation_.Union(rect);
  }
  Layer::SetNeedsDisplayRect(layer_rect);
}

void PictureLayer::Update(ResourceUpdateQueue*,
                          const OcclusionTracker*,
                          RenderingStats* stats) {
  // Do not early-out of this function so that PicturePile::Update has a chance
  // to record pictures due to changing visibility of this layer.

  pile_->Resize(bounds());

  // Calling paint in WebKit can sometimes cause invalidations, so save
  // off the invalidation prior to calling update.
  pile_invalidation_.Swap(pending_invalidation_);
  pending_invalidation_.Clear();

  gfx::Rect visible_layer_rect = gfx::ToEnclosingRect(
      gfx::ScaleRect(visible_content_rect(), 1.f / contents_scale_x()));
  devtools_instrumentation::ScopedPaintLayer paint_layer(id());
  pile_->Update(client_,
                background_color(),
                pile_invalidation_,
                visible_layer_rect,
                stats);
}

void PictureLayer::SetIsMask(bool is_mask) {
  is_mask_ = is_mask;
}

}  // namespace cc