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