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_impl.h"
  13 #include "third_party/skia/include/core/SkPictureRecorder.h"
  14 #include "ui/gfx/geometry/rect_conversions.h"
  15
  16 namespace cc {
  17
  18 scoped_refptr<PictureLayer> PictureLayer::Create(ContentLayerClient* client) {
  19   return make_scoped_refptr(new PictureLayer(client));
  20 }
  21
  22 PictureLayer::PictureLayer(ContentLayerClient* client)
  23     : client_(client),
  24       instrumentation_object_tracker_(id()),
  25       update_source_frame_number_(-1),
  26       can_use_lcd_text_for_update_(true),
  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 }
  43
  44 void PictureLayer::PushPropertiesTo(LayerImpl* base_layer) {
  45   Layer::PushPropertiesTo(base_layer);
  46   PictureLayerImpl* layer_impl = static_cast<PictureLayerImpl*>(base_layer);
  47   // TODO(danakj): Make is_mask_ a constructor parameter for PictureLayer.
  48   DCHECK_EQ(layer_impl->is_mask(), is_mask_);
  49
  50   int source_frame_number = layer_tree_host()->source_frame_number();
  51   gfx::Size impl_bounds = layer_impl->bounds();
  52   gfx::Size recording_source_bounds = recording_source_->GetSize();
  53
  54   // If update called, then recording source size must match bounds pushed to
  55   // impl layer.
  56   DCHECK_IMPLIES(update_source_frame_number_ == source_frame_number,
  57                  impl_bounds == recording_source_bounds)
  58       << " bounds " << impl_bounds.ToString() << " recording source "
  59       << recording_source_bounds.ToString();
  60
  61   if (update_source_frame_number_ != source_frame_number &&
  62       recording_source_bounds != impl_bounds) {
  63     // Update may not get called for the layer (if it's not in the viewport
  64     // for example, even though it has resized making the recording source no
  65     // longer valid. In this case just destroy the recording source.
  66     recording_source_->SetEmptyBounds();
  67   }
  68
  69   layer_impl->SetNearestNeighbor(nearest_neighbor_);
  70
  71   scoped_refptr<RasterSource> raster_source =
  72       recording_source_->CreateRasterSource();
  73   raster_source->SetBackgoundColor(SafeOpaqueBackgroundColor());
  74   raster_source->SetRequiresClear(!contents_opaque() &&
  75                                   !client_->FillsBoundsCompletely());
  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     if (!recording_source_) {
  85       if (host->settings().use_display_lists) {
  86         recording_source_.reset(new DisplayListRecordingSource);
  87       } else {
  88         recording_source_.reset(new PicturePile);
  89       }
  90     }
  91     recording_source_->SetMinContentsScale(
  92         host->settings().minimum_contents_scale);
  93     recording_source_->SetTileGridSize(host->settings().default_tile_grid_size);
  94     recording_source_->SetSlowdownRasterScaleFactor(
  95         host->debug_state().slow_down_raster_scale_factor);
  96   }
  97 }
  98
  99 void PictureLayer::SetNeedsDisplayRect(const gfx::Rect& layer_rect) {
 100   if (!layer_rect.IsEmpty()) {
 101     // Clamp invalidation to the layer bounds.
 102     pending_invalidation_.Union(
 103         gfx::IntersectRects(layer_rect, gfx::Rect(bounds())));
 104   }
 105   Layer::SetNeedsDisplayRect(layer_rect);
 106 }
 107
 108 bool PictureLayer::Update(ResourceUpdateQueue* queue,
 109                           const OcclusionTracker<Layer>* occlusion) {
 110   update_source_frame_number_ = layer_tree_host()->source_frame_number();
 111   bool updated = Layer::Update(queue, occlusion);
 112
 113   bool can_use_lcd_text_changed = UpdateCanUseLCDText();
 114
 115   gfx::Rect visible_layer_rect = gfx::ScaleToEnclosingRect(
 116       visible_content_rect(), 1.f / contents_scale_x());
 117   gfx::Size layer_size = paint_properties().bounds;
 118
 119   if (last_updated_visible_content_rect_ == visible_content_rect() &&
 120       recording_source_->GetSize() == layer_size && !can_use_lcd_text_changed &&
 121       pending_invalidation_.IsEmpty()) {
 122     // Only early out if the visible content rect of this layer hasn't changed.
 123     return updated;
 124   }
 125
 126   TRACE_EVENT1("cc", "PictureLayer::Update",
 127                "source_frame_number",
 128                layer_tree_host()->source_frame_number());
 129   devtools_instrumentation::ScopedLayerTreeTask update_layer(
 130       devtools_instrumentation::kUpdateLayer, id(), layer_tree_host()->id());
 131
 132   // Calling paint in WebKit can sometimes cause invalidations, so save
 133   // off the invalidation prior to calling update.
 134   pending_invalidation_.Swap(&recording_invalidation_);
 135   pending_invalidation_.Clear();
 136
 137   if (layer_tree_host()->settings().record_full_layer) {
 138     // Workaround for http://crbug.com/235910 - to retain backwards compat
 139     // the full page content must always be provided in the picture layer.
 140     visible_layer_rect = gfx::Rect(layer_size);
 141   }
 142
 143   // UpdateAndExpandInvalidation will give us an invalidation that covers
 144   // anything not explicitly recorded in this frame. We give this region
 145   // to the impl side so that it drops tiles that may not have a recording
 146   // for them.
 147   DCHECK(client_);
 148   updated |= recording_source_->UpdateAndExpandInvalidation(
 149       client_, &recording_invalidation_, can_use_lcd_text_for_update_,
 150       layer_size, visible_layer_rect, update_source_frame_number_,
 151       Picture::RECORD_NORMALLY);
 152   last_updated_visible_content_rect_ = visible_content_rect();
 153
 154   if (updated) {
 155     SetNeedsPushProperties();
 156   } else {
 157     // If this invalidation did not affect the recording source, then it can be
 158     // cleared as an optimization.
 159     recording_invalidation_.Clear();
 160   }
 161
 162   return updated;
 163 }
 164
 165 void PictureLayer::SetIsMask(bool is_mask) {
 166   is_mask_ = is_mask;
 167 }
 168
 169 bool PictureLayer::SupportsLCDText() const {
 170   return true;
 171 }
 172
 173 bool PictureLayer::UpdateCanUseLCDText() {
 174   if (!can_use_lcd_text_for_update_)
 175     return false;  // Don't allow the LCD text state to change once disabled.
 176   if (can_use_lcd_text_for_update_ == can_use_lcd_text())
 177     return false;
 178
 179   can_use_lcd_text_for_update_ = can_use_lcd_text();
 180   return true;
 181 }
 182
 183 skia::RefPtr<SkPicture> PictureLayer::GetPicture() const {
 184   // We could either flatten the RecordingSource into a single SkPicture,
 185   // or paint a fresh one depending on what we intend to do with the
 186   // picture. For now we just paint a fresh one to get consistent results.
 187   if (!DrawsContent())
 188     return skia::RefPtr<SkPicture>();
 189
 190   int width = bounds().width();
 191   int height = bounds().height();
 192
 193   SkPictureRecorder recorder;
 194   SkCanvas* canvas = recorder.beginRecording(width, height, nullptr, 0);
 195   client_->PaintContents(canvas,
 196                          gfx::Rect(width, height),
 197                          ContentLayerClient::GRAPHICS_CONTEXT_ENABLED);
 198   skia::RefPtr<SkPicture> picture = skia::AdoptRef(recorder.endRecording());
 199   return picture;
 200 }
 201
 202 bool PictureLayer::IsSuitableForGpuRasterization() const {
 203   return recording_source_->IsSuitableForGpuRasterization();
 204 }
 205
 206 void PictureLayer::ClearClient() {
 207   client_ = nullptr;
 208   UpdateDrawsContent(HasDrawableContent());
 209 }
 210
 211 void PictureLayer::SetNearestNeighbor(bool nearest_neighbor) {
 212   if (nearest_neighbor_ == nearest_neighbor)
 213     return;
 214
 215   nearest_neighbor_ = nearest_neighbor;
 216   SetNeedsCommit();
 217 }
 218
 219 bool PictureLayer::HasDrawableContent() const {
 220   return client_ && Layer::HasDrawableContent();
 221 }
 222
 223 void PictureLayer::RunMicroBenchmark(MicroBenchmark* benchmark) {
 224   benchmark->RunOnLayer(this);
 225 }
 226
 227 }  // namespace cc