cc/layers/picture_layer.cc

   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 "base/auto_reset.h"
   8 #include "cc/layers/content_layer_client.h"
   9 #include "cc/layers/picture_layer_impl.h"
  10 #include "cc/resources/display_list_recording_source.h"
  11 #include "cc/resources/picture_pile.h"
  12 #include "cc/trees/layer_tree_host.h"
  13 #include "cc/trees/layer_tree_impl.h"
  14 #include "third_party/skia/include/core/SkPictureRecorder.h"
  15 #include "ui/gfx/geometry/rect_conversions.h"
  16
  17 namespace cc {
  18
  19 scoped_refptr<PictureLayer> PictureLayer::Create(ContentLayerClient* client) {
  20   return make_scoped_refptr(new PictureLayer(client));
  21 }
  22
  23 PictureLayer::PictureLayer(ContentLayerClient* client)
  24     : client_(client),
  25       instrumentation_object_tracker_(id()),
  26       update_source_frame_number_(-1),
  27       is_mask_(false),
  28       nearest_neighbor_(false) {
  29 }
  30
  31 PictureLayer::PictureLayer(ContentLayerClient* client,
  32                            scoped_ptr<RecordingSource> source)
  33     : PictureLayer(client) {
  34   recording_source_ = source.Pass();
  35 }
  36
  37 PictureLayer::~PictureLayer() {
  38 }
  39
  40 scoped_ptr<LayerImpl> PictureLayer::CreateLayerImpl(LayerTreeImpl* tree_impl) {
  41   return PictureLayerImpl::Create(tree_impl, id(), is_mask_,
  42                                   new LayerImpl::SyncedScrollOffset);
  43 }
  44
  45 void PictureLayer::PushPropertiesTo(LayerImpl* base_layer) {
  46   Layer::PushPropertiesTo(base_layer);
  47   PictureLayerImpl* layer_impl = static_cast<PictureLayerImpl*>(base_layer);
  48   // TODO(danakj): Make is_mask_ a constructor parameter for PictureLayer.
  49   DCHECK_EQ(layer_impl->is_mask(), is_mask_);
  50
  51   int source_frame_number = layer_tree_host()->source_frame_number();
  52   gfx::Size impl_bounds = layer_impl->bounds();
  53   gfx::Size recording_source_bounds = recording_source_->GetSize();
  54
  55   // If update called, then recording source size must match bounds pushed to
  56   // impl layer.
  57   DCHECK_IMPLIES(update_source_frame_number_ == source_frame_number,
  58                  impl_bounds == recording_source_bounds)
  59       << " bounds " << impl_bounds.ToString() << " recording source "
  60       << recording_source_bounds.ToString();
  61
  62   if (update_source_frame_number_ != source_frame_number &&
  63       recording_source_bounds != impl_bounds) {
  64     // Update may not get called for the layer (if it's not in the viewport
  65     // for example, even though it has resized making the recording source no
  66     // longer valid. In this case just destroy the recording source.
  67     recording_source_->SetEmptyBounds();
  68   }
  69
  70   layer_impl->SetNearestNeighbor(nearest_neighbor_);
  71
  72   // Preserve lcd text settings from the current raster source.
  73   bool can_use_lcd_text = layer_impl->RasterSourceUsesLCDText();
  74   scoped_refptr<RasterSource> raster_source =
  75       recording_source_->CreateRasterSource(can_use_lcd_text);
  76   layer_impl->UpdateRasterSource(raster_source, &recording_invalidation_,
  77                                  nullptr);
  78   DCHECK(recording_invalidation_.IsEmpty());
  79 }
  80
  81 void PictureLayer::SetLayerTreeHost(LayerTreeHost* host) {
  82   Layer::SetLayerTreeHost(host);
  83   if (!host)
  84     return;
  85
  86   if (!recording_source_) {
  87     if (host->settings().use_display_lists) {
  88       recording_source_.reset(new DisplayListRecordingSource);
  89     } else {
  90       recording_source_.reset(
  91           new PicturePile(host->settings().minimum_contents_scale,
  92                           host->settings().default_tile_grid_size));
  93     }
  94   }
  95   recording_source_->DidMoveToNewCompositor();
  96   recording_source_->SetSlowdownRasterScaleFactor(
  97       host->debug_state().slow_down_raster_scale_factor);
  98
  99   DCHECK(host->settings().raster_enabled);
 100 }
 101
 102 void PictureLayer::SetNeedsDisplayRect(const gfx::Rect& layer_rect) {
 103   if (!layer_rect.IsEmpty()) {
 104     // Clamp invalidation to the layer bounds.
 105     pending_invalidation_.Union(
 106         gfx::IntersectRects(layer_rect, gfx::Rect(bounds())));
 107   }
 108   Layer::SetNeedsDisplayRect(layer_rect);
 109 }
 110
 111 bool PictureLayer::Update(ResourceUpdateQueue* queue,
 112                           const OcclusionTracker<Layer>* occlusion) {
 113   update_source_frame_number_ = layer_tree_host()->source_frame_number();
 114   bool updated = Layer::Update(queue, occlusion);
 115
 116   gfx::Rect visible_layer_rect = gfx::ScaleToEnclosingRect(
 117       visible_content_rect(), 1.f / contents_scale_x());
 118   gfx::Size layer_size = paint_properties().bounds;
 119
 120   if (last_updated_visible_content_rect_ == visible_content_rect() &&
 121       recording_source_->GetSize() == layer_size &&
 122       pending_invalidation_.IsEmpty()) {
 123     // Only early out if the visible content rect of this layer hasn't changed.
 124     return updated;
 125   }
 126
 127   recording_source_->SetBackgroundColor(SafeOpaqueBackgroundColor());
 128   recording_source_->SetRequiresClear(!contents_opaque() &&
 129                                       !client_->FillsBoundsCompletely());
 130
 131   TRACE_EVENT1("cc", "PictureLayer::Update",
 132                "source_frame_number",
 133                layer_tree_host()->source_frame_number());
 134   devtools_instrumentation::ScopedLayerTreeTask update_layer(
 135       devtools_instrumentation::kUpdateLayer, id(), layer_tree_host()->id());
 136
 137   // Calling paint in WebKit can sometimes cause invalidations, so save
 138   // off the invalidation prior to calling update.
 139   pending_invalidation_.Swap(&recording_invalidation_);
 140   pending_invalidation_.Clear();
 141
 142   if (layer_tree_host()->settings().record_full_layer) {
 143     // Workaround for http://crbug.com/235910 - to retain backwards compat
 144     // the full page content must always be provided in the picture layer.
 145     visible_layer_rect = gfx::Rect(layer_size);
 146   }
 147
 148   // UpdateAndExpandInvalidation will give us an invalidation that covers
 149   // anything not explicitly recorded in this frame. We give this region
 150   // to the impl side so that it drops tiles that may not have a recording
 151   // for them.
 152   DCHECK(client_);
 153   updated |= recording_source_->UpdateAndExpandInvalidation(
 154       client_, &recording_invalidation_, layer_size, visible_layer_rect,
 155       update_source_frame_number_, RecordingSource::RECORD_NORMALLY);
 156   last_updated_visible_content_rect_ = visible_content_rect();
 157
 158   if (updated) {
 159     SetNeedsPushProperties();
 160   } else {
 161     // If this invalidation did not affect the recording source, then it can be
 162     // cleared as an optimization.
 163     recording_invalidation_.Clear();
 164   }
 165
 166   return updated;
 167 }
 168
 169 void PictureLayer::SetIsMask(bool is_mask) {
 170   is_mask_ = is_mask;
 171 }
 172
 173 skia::RefPtr<SkPicture> PictureLayer::GetPicture() const {
 174   // We could either flatten the RecordingSource into a single SkPicture,
 175   // or paint a fresh one depending on what we intend to do with the
 176   // picture. For now we just paint a fresh one to get consistent results.
 177   if (!DrawsContent())
 178     return skia::RefPtr<SkPicture>();
 179
 180   int width = bounds().width();
 181   int height = bounds().height();
 182
 183   SkPictureRecorder recorder;
 184   SkCanvas* canvas = recorder.beginRecording(width, height, nullptr, 0);
 185   client_->PaintContents(canvas, gfx::Rect(width, height),
 186                          ContentLayerClient::PAINTING_BEHAVIOR_NORMAL);
 187   skia::RefPtr<SkPicture> picture = skia::AdoptRef(recorder.endRecording());
 188   return picture;
 189 }
 190
 191 bool PictureLayer::IsSuitableForGpuRasterization() const {
 192   return recording_source_->IsSuitableForGpuRasterization();
 193 }
 194
 195 void PictureLayer::ClearClient() {
 196   client_ = nullptr;
 197   UpdateDrawsContent(HasDrawableContent());
 198 }
 199
 200 void PictureLayer::SetNearestNeighbor(bool nearest_neighbor) {
 201   if (nearest_neighbor_ == nearest_neighbor)
 202     return;
 203
 204   nearest_neighbor_ = nearest_neighbor;
 205   SetNeedsCommit();
 206 }
 207
 208 bool PictureLayer::HasDrawableContent() const {
 209   return client_ && Layer::HasDrawableContent();
 210 }
 211
 212 void PictureLayer::RunMicroBenchmark(MicroBenchmark* benchmark) {
 213   benchmark->RunOnLayer(this);
 214 }
 215
 216 }  // namespace cc