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 "cc/layers/content_layer_client.h"
   8 #include "cc/layers/picture_layer_impl.h"
   9 #include "cc/trees/layer_tree_impl.h"
  10 #include "ui/gfx/rect_conversions.h"
  11
  12 namespace cc {
  13
  14 scoped_refptr<PictureLayer> PictureLayer::Create(ContentLayerClient* client) {
  15   return make_scoped_refptr(new PictureLayer(client));
  16 }
  17
  18 PictureLayer::PictureLayer(ContentLayerClient* client)
  19   : client_(client),
  20     pile_(make_scoped_refptr(new PicturePile())),
  21     instrumentation_object_tracker_(id()),
  22     is_mask_(false),
  23     update_source_frame_number_(-1) {
  24 }
  25
  26 PictureLayer::~PictureLayer() {
  27 }
  28
  29 bool PictureLayer::DrawsContent() const {
  30   return Layer::DrawsContent() && client_;
  31 }
  32
  33 scoped_ptr<LayerImpl> PictureLayer::CreateLayerImpl(LayerTreeImpl* tree_impl) {
  34   return PictureLayerImpl::Create(tree_impl, id()).PassAs<LayerImpl>();
  35 }
  36
  37 void PictureLayer::PushPropertiesTo(LayerImpl* base_layer) {
  38   Layer::PushPropertiesTo(base_layer);
  39   PictureLayerImpl* layer_impl = static_cast<PictureLayerImpl*>(base_layer);
  40
  41   if (layer_impl->bounds().IsEmpty()) {
  42     // Update may not get called for an empty layer, so resize here instead.
  43     // Using layer_impl because either bounds() or paint_properties().bounds
  44     // may disagree and either one could have been pushed to layer_impl.
  45     pile_->Resize(gfx::Size());
  46     pile_->UpdateRecordedRegion();
  47   } else if (update_source_frame_number_ ==
  48              layer_tree_host()->source_frame_number()) {
  49     // If update called, then pile size must match bounds pushed to impl layer.
  50     DCHECK_EQ(layer_impl->bounds().ToString(), pile_->size().ToString());
  51   }
  52
  53   layer_impl->SetIsMask(is_mask_);
  54   // Unlike other properties, invalidation must always be set on layer_impl.
  55   // See PictureLayerImpl::PushPropertiesTo for more details.
  56   layer_impl->invalidation_.Clear();
  57   layer_impl->invalidation_.Swap(&pile_invalidation_);
  58   layer_impl->pile_ = PicturePileImpl::CreateFromOther(pile_.get());
  59 }
  60
  61 void PictureLayer::SetLayerTreeHost(LayerTreeHost* host) {
  62   Layer::SetLayerTreeHost(host);
  63   if (host) {
  64     pile_->SetMinContentsScale(host->settings().minimum_contents_scale);
  65     pile_->SetTileGridSize(host->settings().default_tile_size);
  66     pile_->set_slow_down_raster_scale_factor(
  67         host->debug_state().slow_down_raster_scale_factor);
  68     pile_->set_show_debug_picture_borders(
  69         host->debug_state().show_picture_borders);
  70   }
  71 }
  72
  73 void PictureLayer::SetNeedsDisplayRect(const gfx::RectF& layer_rect) {
  74   gfx::Rect rect = gfx::ToEnclosedRect(layer_rect);
  75   if (!rect.IsEmpty()) {
  76     // Clamp invalidation to the layer bounds.
  77     rect.Intersect(gfx::Rect(bounds()));
  78     pending_invalidation_.Union(rect);
  79   }
  80   Layer::SetNeedsDisplayRect(layer_rect);
  81 }
  82
  83 bool PictureLayer::Update(ResourceUpdateQueue* queue,
  84                           const OcclusionTracker* occlusion) {
  85   update_source_frame_number_ = layer_tree_host()->source_frame_number();
  86   bool updated = Layer::Update(queue, occlusion);
  87
  88   if (last_updated_visible_content_rect_ == visible_content_rect() &&
  89       pile_->size() == paint_properties().bounds &&
  90       pending_invalidation_.IsEmpty()) {
  91     // Only early out if the visible content rect of this layer hasn't changed.
  92     return updated;
  93   }
  94
  95   TRACE_EVENT1("cc", "PictureLayer::Update",
  96                "source_frame_number",
  97                layer_tree_host()->source_frame_number());
  98
  99   pile_->Resize(paint_properties().bounds);
 100
 101   // Calling paint in WebKit can sometimes cause invalidations, so save
 102   // off the invalidation prior to calling update.
 103   pending_invalidation_.Swap(&pile_invalidation_);
 104   pending_invalidation_.Clear();
 105
 106   gfx::Rect visible_layer_rect = gfx::ScaleToEnclosingRect(
 107       visible_content_rect(), 1.f / contents_scale_x());
 108   if (layer_tree_host()->settings().using_synchronous_renderer_compositor) {
 109     // Workaround for http://crbug.com/235910 - to retain backwards compat
 110     // the full page content must always be provided in the picture layer.
 111     visible_layer_rect = gfx::Rect(bounds());
 112   }
 113   updated |= pile_->Update(client_,
 114                            SafeOpaqueBackgroundColor(),
 115                            contents_opaque(),
 116                            pile_invalidation_,
 117                            visible_layer_rect,
 118                            update_source_frame_number_,
 119                            rendering_stats_instrumentation());
 120   last_updated_visible_content_rect_ = visible_content_rect();
 121
 122   if (updated) {
 123     SetNeedsPushProperties();
 124   } else {
 125     // If this invalidation did not affect the pile, then it can be cleared as
 126     // an optimization.
 127     pile_invalidation_.Clear();
 128   }
 129
 130   return updated;
 131 }
 132
 133 void PictureLayer::SetIsMask(bool is_mask) {
 134   is_mask_ = is_mask;
 135 }
 136
 137 bool PictureLayer::SupportsLCDText() const {
 138   return true;
 139 }
 140
 141 skia::RefPtr<SkPicture> PictureLayer::GetPicture() const {
 142   // We could either flatten the PicturePile into a single SkPicture,
 143   // or paint a fresh one depending on what we intend to do with the
 144   // picture. For now we just paint a fresh one to get consistent results.
 145   if (!DrawsContent())
 146     return skia::RefPtr<SkPicture>();
 147
 148   int width = bounds().width();
 149   int height = bounds().height();
 150   gfx::RectF opaque;
 151
 152   skia::RefPtr<SkPicture> picture = skia::AdoptRef(new SkPicture);
 153   SkCanvas* canvas = picture->beginRecording(width, height);
 154   client_->PaintContents(canvas, gfx::Rect(width, height), &opaque);
 155   picture->endRecording();
 156   return picture;
 157 }
 158
 159 void PictureLayer::RunMicroBenchmark(MicroBenchmark* benchmark) {
 160   benchmark->RunOnLayer(this);
 161 }
 162
 163 }  // namespace cc