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      1 // Copyright 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "cc/layers/picture_layer.h"
      6 
      7 #include "cc/debug/benchmark_instrumentation.h"
      8 #include "cc/debug/devtools_instrumentation.h"
      9 #include "cc/layers/picture_layer_impl.h"
     10 #include "cc/trees/layer_tree_impl.h"
     11 #include "ui/gfx/rect_conversions.h"
     12 
     13 namespace cc {
     14 
     15 scoped_refptr<PictureLayer> PictureLayer::Create(ContentLayerClient* client) {
     16   return make_scoped_refptr(new PictureLayer(client));
     17 }
     18 
     19 PictureLayer::PictureLayer(ContentLayerClient* client)
     20   : client_(client),
     21     pile_(make_scoped_refptr(new PicturePile())),
     22     instrumentation_object_tracker_(id()),
     23     is_mask_(false) {
     24 }
     25 
     26 PictureLayer::~PictureLayer() {
     27 }
     28 
     29 bool PictureLayer::DrawsContent() const {
     30   return Layer::DrawsContent() && client_;
     31 }
     32 
     33 scoped_ptr<LayerImpl> PictureLayer::CreateLayerImpl(LayerTreeImpl* tree_impl) {
     34   return PictureLayerImpl::Create(tree_impl, id()).PassAs<LayerImpl>();
     35 }
     36 
     37 void PictureLayer::PushPropertiesTo(LayerImpl* base_layer) {
     38   Layer::PushPropertiesTo(base_layer);
     39 
     40   PictureLayerImpl* layer_impl = static_cast<PictureLayerImpl*>(base_layer);
     41   // This should be first so others can use it.
     42   layer_impl->UpdateTwinLayer();
     43 
     44   if (layer_impl->bounds().IsEmpty()) {
     45     // Update may not get called for an empty layer, so resize here instead.
     46     // Using layer_impl because either bounds() or paint_properties().bounds
     47     // may disagree and either one could have been pushed to layer_impl.
     48     pile_->Resize(layer_impl->bounds());
     49     pile_->UpdateRecordedRegion();
     50   }
     51 
     52   if (DrawsContent()) {
     53     DCHECK(paint_properties().bounds == pile_->size());
     54   }
     55 
     56   layer_impl->SetIsMask(is_mask_);
     57   layer_impl->CreateTilingSetIfNeeded();
     58   // Unlike other properties, invalidation must always be set on layer_impl.
     59   // See PictureLayerImpl::PushPropertiesTo for more details.
     60   layer_impl->invalidation_.Clear();
     61   layer_impl->invalidation_.Swap(&pile_invalidation_);
     62   layer_impl->pile_ = PicturePileImpl::CreateFromOther(pile_.get());
     63   layer_impl->SyncFromActiveLayer();
     64 
     65   // PictureLayer must push properties every frame.
     66   // TODO(danakj): If we can avoid requiring to do CreateTilingSetIfNeeded() and
     67   // SyncFromActiveLayer() on every commit then this could go away, maybe
     68   // conditionally. crbug.com/259402
     69   needs_push_properties_ = true;
     70 }
     71 
     72 void PictureLayer::SetLayerTreeHost(LayerTreeHost* host) {
     73   Layer::SetLayerTreeHost(host);
     74   if (host) {
     75     pile_->SetMinContentsScale(host->settings().minimum_contents_scale);
     76     pile_->SetTileGridSize(host->settings().default_tile_size);
     77     pile_->set_num_raster_threads(host->settings().num_raster_threads);
     78     pile_->set_slow_down_raster_scale_factor(
     79         host->debug_state().slow_down_raster_scale_factor);
     80     pile_->set_show_debug_picture_borders(
     81         host->debug_state().show_picture_borders);
     82   }
     83 }
     84 
     85 void PictureLayer::SetNeedsDisplayRect(const gfx::RectF& layer_rect) {
     86   gfx::Rect rect = gfx::ToEnclosedRect(layer_rect);
     87   if (!rect.IsEmpty()) {
     88     // Clamp invalidation to the layer bounds.
     89     rect.Intersect(gfx::Rect(bounds()));
     90     pending_invalidation_.Union(rect);
     91   }
     92   Layer::SetNeedsDisplayRect(layer_rect);
     93 }
     94 
     95 bool PictureLayer::Update(ResourceUpdateQueue* queue,
     96                           const OcclusionTracker* occlusion) {
     97   // Do not early-out of this function so that PicturePile::Update has a chance
     98   // to record pictures due to changing visibility of this layer.
     99 
    100   TRACE_EVENT1(benchmark_instrumentation::kCategory,
    101                benchmark_instrumentation::kPictureLayerUpdate,
    102                benchmark_instrumentation::kSourceFrameNumber,
    103                layer_tree_host()->source_frame_number());
    104 
    105   bool updated = Layer::Update(queue, occlusion);
    106 
    107   pile_->Resize(paint_properties().bounds);
    108 
    109   // Calling paint in WebKit can sometimes cause invalidations, so save
    110   // off the invalidation prior to calling update.
    111   pending_invalidation_.Swap(&pile_invalidation_);
    112   pending_invalidation_.Clear();
    113 
    114   gfx::Rect visible_layer_rect = gfx::ScaleToEnclosingRect(
    115       visible_content_rect(), 1.f / contents_scale_x());
    116   if (layer_tree_host()->settings().using_synchronous_renderer_compositor) {
    117     // Workaround for http://crbug.com/235910 - to retain backwards compat
    118     // the full page content must always be provided in the picture layer.
    119     visible_layer_rect = gfx::Rect(bounds());
    120   }
    121   devtools_instrumentation::ScopedLayerTask paint_layer(
    122       devtools_instrumentation::kPaintLayer, id());
    123   updated |= pile_->Update(client_,
    124                            SafeOpaqueBackgroundColor(),
    125                            contents_opaque(),
    126                            pile_invalidation_,
    127                            visible_layer_rect,
    128                            rendering_stats_instrumentation());
    129   if (!updated) {
    130     // If this invalidation did not affect the pile, then it can be cleared as
    131     // an optimization.
    132     pile_invalidation_.Clear();
    133   }
    134   return updated;
    135 }
    136 
    137 void PictureLayer::SetIsMask(bool is_mask) {
    138   is_mask_ = is_mask;
    139 }
    140 
    141 bool PictureLayer::SupportsLCDText() const {
    142   return true;
    143 }
    144 
    145 }  // namespace cc
    146