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