src/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/trees/layer_tree_impl.h"
  11 #include "third_party/skia/include/core/SkPictureRecorder.h"
  12 #include "ui/gfx/rect_conversions.h"
  13
  14 namespace cc {
  15
  16 scoped_refptr<PictureLayer> PictureLayer::Create(ContentLayerClient* client) {
  17   return make_scoped_refptr(new PictureLayer(client));
  18 }
  19
  20 PictureLayer::PictureLayer(ContentLayerClient* client)
  21     : client_(client),
  22       pile_(make_scoped_refptr(new PicturePile())),
  23       instrumentation_object_tracker_(id()),
  24       update_source_frame_number_(-1),
  25       can_use_lcd_text_last_frame_(can_use_lcd_text()) {
  26 }
  27
  28 PictureLayer::~PictureLayer() {
  29 }
  30
  31 scoped_ptr<LayerImpl> PictureLayer::CreateLayerImpl(LayerTreeImpl* tree_impl) {
  32   return PictureLayerImpl::Create(tree_impl, id()).PassAs<LayerImpl>();
  33 }
  34
  35 void PictureLayer::PushPropertiesTo(LayerImpl* base_layer) {
  36   Layer::PushPropertiesTo(base_layer);
  37   PictureLayerImpl* layer_impl = static_cast<PictureLayerImpl*>(base_layer);
  38
  39   if (layer_impl->bounds().IsEmpty()) {
  40     // Update may not get called for an empty layer, so resize here instead.
  41     // Using layer_impl because either bounds() or paint_properties().bounds
  42     // may disagree and either one could have been pushed to layer_impl.
  43     pile_->SetEmptyBounds();
  44   } else if (update_source_frame_number_ ==
  45              layer_tree_host()->source_frame_number()) {
  46     // TODO(ernstm): This DCHECK is only valid as long as the pile's tiling_rect
  47     // is identical to the layer_rect.
  48     // If update called, then pile size must match bounds pushed to impl layer.
  49     DCHECK_EQ(layer_impl->bounds().ToString(), pile_->tiling_size().ToString());
  50   }
  51
  52   // Unlike other properties, invalidation must always be set on layer_impl.
  53   // See PictureLayerImpl::PushPropertiesTo for more details.
  54   layer_impl->invalidation_.Clear();
  55   layer_impl->invalidation_.Swap(&pile_invalidation_);
  56   layer_impl->pile_ = PicturePileImpl::CreateFromOther(pile_.get());
  57 }
  58
  59 void PictureLayer::SetLayerTreeHost(LayerTreeHost* host) {
  60   Layer::SetLayerTreeHost(host);
  61   if (host) {
  62     pile_->SetMinContentsScale(host->settings().minimum_contents_scale);
  63     pile_->SetTileGridSize(host->settings().default_tile_size);
  64     pile_->set_slow_down_raster_scale_factor(
  65         host->debug_state().slow_down_raster_scale_factor);
  66     pile_->set_show_debug_picture_borders(
  67         host->debug_state().show_picture_borders);
  68   }
  69 }
  70
  71 void PictureLayer::SetNeedsDisplayRect(const gfx::RectF& layer_rect) {
  72   gfx::Rect rect = gfx::ToEnclosedRect(layer_rect);
  73   if (!rect.IsEmpty()) {
  74     // Clamp invalidation to the layer bounds.
  75     rect.Intersect(gfx::Rect(bounds()));
  76     pending_invalidation_.Union(rect);
  77   }
  78   Layer::SetNeedsDisplayRect(layer_rect);
  79 }
  80
  81 bool PictureLayer::Update(ResourceUpdateQueue* queue,
  82                           const OcclusionTracker<Layer>* occlusion) {
  83   update_source_frame_number_ = layer_tree_host()->source_frame_number();
  84   bool updated = Layer::Update(queue, occlusion);
  85
  86   {
  87     base::AutoReset<bool> ignore_set_needs_commit(&ignore_set_needs_commit_,
  88                                                   true);
  89     UpdateCanUseLCDText();
  90   }
  91
  92   gfx::Rect visible_layer_rect = gfx::ScaleToEnclosingRect(
  93       visible_content_rect(), 1.f / contents_scale_x());
  94   gfx::Size layer_size = paint_properties().bounds;
  95
  96   if (last_updated_visible_content_rect_ == visible_content_rect() &&
  97       pile_->tiling_size() == layer_size && pending_invalidation_.IsEmpty()) {
  98     // Only early out if the visible content rect of this layer hasn't changed.
  99     return updated;
 100   }
 101
 102   TRACE_EVENT1("cc", "PictureLayer::Update",
 103                "source_frame_number",
 104                layer_tree_host()->source_frame_number());
 105   devtools_instrumentation::ScopedLayerTreeTask update_layer(
 106       devtools_instrumentation::kUpdateLayer, id(), layer_tree_host()->id());
 107
 108   // Calling paint in WebKit can sometimes cause invalidations, so save
 109   // off the invalidation prior to calling update.
 110   pending_invalidation_.Swap(&pile_invalidation_);
 111   pending_invalidation_.Clear();
 112
 113   if (layer_tree_host()->settings().record_full_layer) {
 114     // Workaround for http://crbug.com/235910 - to retain backwards compat
 115     // the full page content must always be provided in the picture layer.
 116     visible_layer_rect = gfx::Rect(layer_size);
 117   }
 118
 119   // UpdateAndExpandInvalidation will give us an invalidation that covers
 120   // anything not explicitly recorded in this frame. We give this region
 121   // to the impl side so that it drops tiles that may not have a recording
 122   // for them.
 123   DCHECK(client_);
 124   updated |=
 125       pile_->UpdateAndExpandInvalidation(client_,
 126                                          &pile_invalidation_,
 127                                          SafeOpaqueBackgroundColor(),
 128                                          contents_opaque(),
 129                                          client_->FillsBoundsCompletely(),
 130                                          layer_size,
 131                                          visible_layer_rect,
 132                                          update_source_frame_number_,
 133                                          RecordingMode(),
 134                                          rendering_stats_instrumentation());
 135   last_updated_visible_content_rect_ = visible_content_rect();
 136
 137   if (updated) {
 138     SetNeedsPushProperties();
 139   } else {
 140     // If this invalidation did not affect the pile, then it can be cleared as
 141     // an optimization.
 142     pile_invalidation_.Clear();
 143   }
 144
 145   return updated;
 146 }
 147
 148 void PictureLayer::SetIsMask(bool is_mask) {
 149   pile_->set_is_mask(is_mask);
 150 }
 151
 152 Picture::RecordingMode PictureLayer::RecordingMode() const {
 153   switch (layer_tree_host()->settings().recording_mode) {
 154     case LayerTreeSettings::RecordNormally:
 155       return Picture::RECORD_NORMALLY;
 156     case LayerTreeSettings::RecordWithSkRecord:
 157       return Picture::RECORD_WITH_SKRECORD;
 158   }
 159   NOTREACHED();
 160   return Picture::RECORD_NORMALLY;
 161 }
 162
 163 bool PictureLayer::SupportsLCDText() const {
 164   return true;
 165 }
 166
 167 void PictureLayer::UpdateCanUseLCDText() {
 168   if (can_use_lcd_text_last_frame_ == can_use_lcd_text())
 169     return;
 170
 171   can_use_lcd_text_last_frame_ = can_use_lcd_text();
 172   if (client_)
 173     client_->DidChangeLayerCanUseLCDText();
 174 }
 175
 176 skia::RefPtr<SkPicture> PictureLayer::GetPicture() const {
 177   // We could either flatten the PicturePile 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   int width = bounds().width();
 184   int height = bounds().height();
 185
 186   SkPictureRecorder recorder;
 187   SkCanvas* canvas = recorder.beginRecording(width, height, NULL, 0);
 188   client_->PaintContents(canvas,
 189                          gfx::Rect(width, height),
 190                          ContentLayerClient::GRAPHICS_CONTEXT_ENABLED);
 191   skia::RefPtr<SkPicture> picture = skia::AdoptRef(recorder.endRecording());
 192   return picture;
 193 }
 194
 195 bool PictureLayer::IsSuitableForGpuRasterization() const {
 196   return pile_->is_suitable_for_gpu_rasterization();
 197 }
 198
 199 void PictureLayer::ClearClient() {
 200   client_ = NULL;
 201   UpdateDrawsContent(HasDrawableContent());
 202 }
 203
 204 bool PictureLayer::HasDrawableContent() const {
 205   return client_ && Layer::HasDrawableContent();
 206 }
 207
 208 void PictureLayer::RunMicroBenchmark(MicroBenchmark* benchmark) {
 209   benchmark->RunOnLayer(this);
 210 }
 211
 212 }  // namespace cc