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/playback/display_list_recording_source.h"
  11 #include "cc/playback/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(const LayerSettings& settings,
  20                                                  ContentLayerClient* client) {
  21   return make_scoped_refptr(new PictureLayer(settings, client));
  22 }
  23
  24 PictureLayer::PictureLayer(const LayerSettings& settings,
  25                            ContentLayerClient* client)
  26     : Layer(settings),
  27       client_(client),
  28       instrumentation_object_tracker_(id()),
  29       update_source_frame_number_(-1),
  30       is_mask_(false),
  31       nearest_neighbor_(false) {
  32 }
  33
  34 PictureLayer::PictureLayer(const LayerSettings& settings,
  35                            ContentLayerClient* client,
  36                            scoped_ptr<RecordingSource> source)
  37     : PictureLayer(settings, client) {
  38   recording_source_ = source.Pass();
  39 }
  40
  41 PictureLayer::~PictureLayer() {
  42 }
  43
  44 scoped_ptr<LayerImpl> PictureLayer::CreateLayerImpl(LayerTreeImpl* tree_impl) {
  45   return PictureLayerImpl::Create(tree_impl, id(), is_mask_,
  46                                   new LayerImpl::SyncedScrollOffset);
  47 }
  48
  49 void PictureLayer::PushPropertiesTo(LayerImpl* base_layer) {
  50   Layer::PushPropertiesTo(base_layer);
  51   PictureLayerImpl* layer_impl = static_cast<PictureLayerImpl*>(base_layer);
  52   // TODO(danakj): Make is_mask_ a constructor parameter for PictureLayer.
  53   DCHECK_EQ(layer_impl->is_mask(), is_mask_);
  54
  55   int source_frame_number = layer_tree_host()->source_frame_number();
  56   gfx::Size impl_bounds = layer_impl->bounds();
  57   gfx::Size recording_source_bounds = recording_source_->GetSize();
  58
  59   // If update called, then recording source size must match bounds pushed to
  60   // impl layer.
  61   DCHECK_IMPLIES(update_source_frame_number_ == source_frame_number,
  62                  impl_bounds == recording_source_bounds)
  63       << " bounds " << impl_bounds.ToString() << " recording source "
  64       << recording_source_bounds.ToString();
  65
  66   if (update_source_frame_number_ != source_frame_number &&
  67       recording_source_bounds != impl_bounds) {
  68     // Update may not get called for the layer (if it's not in the viewport
  69     // for example, even though it has resized making the recording source no
  70     // longer valid. In this case just destroy the recording source.
  71     recording_source_->SetEmptyBounds();
  72   }
  73
  74   layer_impl->SetNearestNeighbor(nearest_neighbor_);
  75
  76   // Preserve lcd text settings from the current raster source.
  77   bool can_use_lcd_text = layer_impl->RasterSourceUsesLCDText();
  78   scoped_refptr<RasterSource> raster_source =
  79       recording_source_->CreateRasterSource(can_use_lcd_text);
  80   layer_impl->set_gpu_raster_max_texture_size(
  81       layer_tree_host()->device_viewport_size());
  82   layer_impl->UpdateRasterSource(raster_source, &recording_invalidation_,
  83                                  nullptr);
  84   DCHECK(recording_invalidation_.IsEmpty());
  85 }
  86
  87 void PictureLayer::SetLayerTreeHost(LayerTreeHost* host) {
  88   Layer::SetLayerTreeHost(host);
  89   if (!host)
  90     return;
  91
  92   const LayerTreeSettings& settings = layer_tree_host()->settings();
  93   if (!recording_source_) {
  94     if (settings.use_display_lists) {
  95       recording_source_.reset(
  96           new DisplayListRecordingSource(settings.default_tile_grid_size));
  97     } else {
  98       recording_source_.reset(new PicturePile(settings.minimum_contents_scale,
  99                                               settings.default_tile_grid_size));
 100     }
 101   }
 102   recording_source_->SetSlowdownRasterScaleFactor(
 103       host->debug_state().slow_down_raster_scale_factor);
 104   recording_source_->SetGatherPixelRefs(settings.gather_pixel_refs);
 105 }
 106
 107 void PictureLayer::SetNeedsDisplayRect(const gfx::Rect& layer_rect) {
 108   if (!layer_rect.IsEmpty()) {
 109     // Clamp invalidation to the layer bounds.
 110     pending_invalidation_.Union(
 111         gfx::IntersectRects(layer_rect, gfx::Rect(bounds())));
 112   }
 113   Layer::SetNeedsDisplayRect(layer_rect);
 114 }
 115
 116 bool PictureLayer::Update() {
 117   update_source_frame_number_ = layer_tree_host()->source_frame_number();
 118   bool updated = Layer::Update();
 119
 120   gfx::Rect update_rect = visible_layer_rect();
 121   gfx::Size layer_size = paint_properties().bounds;
 122
 123   if (last_updated_visible_layer_rect_ == update_rect &&
 124       recording_source_->GetSize() == layer_size &&
 125       pending_invalidation_.IsEmpty()) {
 126     // Only early out if the visible content rect of this layer hasn't changed.
 127     return updated;
 128   }
 129
 130   recording_source_->SetBackgroundColor(SafeOpaqueBackgroundColor());
 131   recording_source_->SetRequiresClear(!contents_opaque() &&
 132                                       !client_->FillsBoundsCompletely());
 133
 134   TRACE_EVENT1("cc", "PictureLayer::Update",
 135                "source_frame_number",
 136                layer_tree_host()->source_frame_number());
 137   devtools_instrumentation::ScopedLayerTreeTask update_layer(
 138       devtools_instrumentation::kUpdateLayer, id(), layer_tree_host()->id());
 139
 140   // Calling paint in WebKit can sometimes cause invalidations, so save
 141   // off the invalidation prior to calling update.
 142   pending_invalidation_.Swap(&recording_invalidation_);
 143   pending_invalidation_.Clear();
 144
 145   if (layer_tree_host()->settings().record_full_layer) {
 146     // Workaround for http://crbug.com/235910 - to retain backwards compat
 147     // the full page content must always be provided in the picture layer.
 148     update_rect = gfx::Rect(layer_size);
 149   }
 150
 151   // UpdateAndExpandInvalidation will give us an invalidation that covers
 152   // anything not explicitly recorded in this frame. We give this region
 153   // to the impl side so that it drops tiles that may not have a recording
 154   // for them.
 155   DCHECK(client_);
 156   updated |= recording_source_->UpdateAndExpandInvalidation(
 157       client_, &recording_invalidation_, layer_size, update_rect,
 158       update_source_frame_number_, RecordingSource::RECORD_NORMALLY);
 159   last_updated_visible_layer_rect_ = visible_layer_rect();
 160
 161   if (updated) {
 162     SetNeedsPushProperties();
 163   } else {
 164     // If this invalidation did not affect the recording source, then it can be
 165     // cleared as an optimization.
 166     recording_invalidation_.Clear();
 167   }
 168
 169   return updated;
 170 }
 171
 172 void PictureLayer::SetIsMask(bool is_mask) {
 173   is_mask_ = is_mask;
 174 }
 175
 176 skia::RefPtr<SkPicture> PictureLayer::GetPicture() const {
 177   // We could either flatten the RecordingSource into a single SkPicture,
 178   // or paint a fresh one depending on what we intend to do with the
 179   // picture. For now we just paint a fresh one to get consistent results.
 180   if (!DrawsContent())
 181     return skia::RefPtr<SkPicture>();
 182
 183   gfx::Size layer_size = bounds();
 184   const LayerTreeSettings& settings = layer_tree_host()->settings();
 185
 186   if (settings.use_display_lists) {
 187     scoped_ptr<RecordingSource> recording_source;
 188     recording_source.reset(
 189         new DisplayListRecordingSource(settings.default_tile_grid_size));
 190     Region recording_invalidation;
 191     recording_source->UpdateAndExpandInvalidation(
 192         client_, &recording_invalidation, layer_size, gfx::Rect(layer_size),
 193         update_source_frame_number_, RecordingSource::RECORD_NORMALLY);
 194
 195     scoped_refptr<RasterSource> raster_source =
 196         recording_source->CreateRasterSource(false);
 197
 198     return raster_source->GetFlattenedPicture();
 199   }
 200
 201   int width = layer_size.width();
 202   int height = layer_size.height();
 203
 204   SkPictureRecorder recorder;
 205   SkCanvas* canvas = recorder.beginRecording(width, height, nullptr, 0);
 206   client_->PaintContents(canvas, gfx::Rect(width, height),
 207                          ContentLayerClient::PAINTING_BEHAVIOR_NORMAL);
 208   skia::RefPtr<SkPicture> picture =
 209       skia::AdoptRef(recorder.endRecordingAsPicture());
 210   return picture;
 211 }
 212
 213 bool PictureLayer::IsSuitableForGpuRasterization() const {
 214   return recording_source_->IsSuitableForGpuRasterization();
 215 }
 216
 217 void PictureLayer::ClearClient() {
 218   client_ = nullptr;
 219   UpdateDrawsContent(HasDrawableContent());
 220 }
 221
 222 void PictureLayer::SetNearestNeighbor(bool nearest_neighbor) {
 223   if (nearest_neighbor_ == nearest_neighbor)
 224     return;
 225
 226   nearest_neighbor_ = nearest_neighbor;
 227   SetNeedsCommit();
 228 }
 229
 230 bool PictureLayer::HasDrawableContent() const {
 231   return client_ && Layer::HasDrawableContent();
 232 }
 233
 234 void PictureLayer::RunMicroBenchmark(MicroBenchmark* benchmark) {
 235   benchmark->RunOnLayer(this);
 236 }
 237
 238 }  // namespace cc