src/cc/layers/content_layer.cc

   1 // Copyright 2010 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/content_layer.h"
   6
   7 #include "base/auto_reset.h"
   8 #include "base/metrics/histogram.h"
   9 #include "base/time/time.h"
  10 #include "cc/layers/content_layer_client.h"
  11 #include "cc/resources/bitmap_content_layer_updater.h"
  12 #include "cc/resources/bitmap_skpicture_content_layer_updater.h"
  13 #include "cc/resources/layer_painter.h"
  14 #include "cc/trees/layer_tree_host.h"
  15
  16 namespace cc {
  17
  18 ContentLayerPainter::ContentLayerPainter(ContentLayerClient* client)
  19     : client_(client) {}
  20
  21 scoped_ptr<ContentLayerPainter> ContentLayerPainter::Create(
  22     ContentLayerClient* client) {
  23   return make_scoped_ptr(new ContentLayerPainter(client));
  24 }
  25
  26 void ContentLayerPainter::Paint(SkCanvas* canvas,
  27                                 gfx::Rect content_rect,
  28                                 gfx::RectF* opaque) {
  29   base::TimeTicks paint_start = base::TimeTicks::HighResNow();
  30   client_->PaintContents(canvas, content_rect, opaque);
  31   base::TimeTicks paint_end = base::TimeTicks::HighResNow();
  32   // The start and end times might be the same if the paint was very fast or if
  33   // our timer granularity is poor. Treat this as a very short time duration
  34   // instead of none to avoid dividing by zero.
  35   if (paint_end == paint_start)
  36     paint_end += base::TimeDelta::FromMicroseconds(1);
  37
  38   double pixels_per_sec = (content_rect.width() * content_rect.height()) /
  39                           (paint_end - paint_start).InSecondsF();
  40   UMA_HISTOGRAM_CUSTOM_COUNTS("Renderer4.AccelContentPaintDurationMS",
  41                               (paint_end - paint_start).InMilliseconds(),
  42                               0,
  43                               120,
  44                               30);
  45   UMA_HISTOGRAM_CUSTOM_COUNTS("Renderer4.AccelContentPaintMegapixPerSecond",
  46                               pixels_per_sec / 1000000,
  47                               10,
  48                               210,
  49                               30);
  50 }
  51
  52 scoped_refptr<ContentLayer> ContentLayer::Create(ContentLayerClient* client) {
  53   return make_scoped_refptr(new ContentLayer(client));
  54 }
  55
  56 ContentLayer::ContentLayer(ContentLayerClient* client)
  57     : TiledLayer(),
  58       client_(client),
  59       can_use_lcd_text_last_frame_(can_use_lcd_text()) {
  60 }
  61
  62 ContentLayer::~ContentLayer() {}
  63
  64 bool ContentLayer::DrawsContent() const {
  65   return TiledLayer::DrawsContent() && client_;
  66 }
  67
  68 void ContentLayer::SetLayerTreeHost(LayerTreeHost* host) {
  69   TiledLayer::SetLayerTreeHost(host);
  70
  71   if (!updater_.get())
  72     return;
  73
  74   if (host) {
  75     updater_->set_rendering_stats_instrumentation(
  76         host->rendering_stats_instrumentation());
  77   } else {
  78     updater_->set_rendering_stats_instrumentation(NULL);
  79   }
  80 }
  81
  82 void ContentLayer::SetTexturePriorities(
  83     const PriorityCalculator& priority_calc) {
  84   // Update the tile data before creating all the layer's tiles.
  85   UpdateTileSizeAndTilingOption();
  86
  87   TiledLayer::SetTexturePriorities(priority_calc);
  88 }
  89
  90 bool ContentLayer::Update(ResourceUpdateQueue* queue,
  91                           const OcclusionTracker* occlusion) {
  92   {
  93     base::AutoReset<bool> ignore_set_needs_commit(&ignore_set_needs_commit_,
  94                                                   true);
  95
  96     CreateUpdaterIfNeeded();
  97     UpdateCanUseLCDText();
  98   }
  99
 100   bool updated = TiledLayer::Update(queue, occlusion);
 101   return updated;
 102 }
 103
 104 bool ContentLayer::NeedMoreUpdates() {
 105   return NeedsIdlePaint();
 106 }
 107
 108 LayerUpdater* ContentLayer::Updater() const {
 109   return updater_.get();
 110 }
 111
 112 void ContentLayer::CreateUpdaterIfNeeded() {
 113   if (updater_.get())
 114     return;
 115   scoped_ptr<LayerPainter> painter =
 116       ContentLayerPainter::Create(client_).PassAs<LayerPainter>();
 117   if (layer_tree_host()->settings().per_tile_painting_enabled) {
 118     updater_ = BitmapSkPictureContentLayerUpdater::Create(
 119         painter.Pass(),
 120         rendering_stats_instrumentation(),
 121         id());
 122   } else {
 123     updater_ = BitmapContentLayerUpdater::Create(
 124         painter.Pass(),
 125         rendering_stats_instrumentation(),
 126         id());
 127   }
 128   updater_->SetOpaque(contents_opaque());
 129
 130   SetTextureFormat(
 131       layer_tree_host()->GetRendererCapabilities().best_texture_format);
 132 }
 133
 134 void ContentLayer::SetContentsOpaque(bool opaque) {
 135   Layer::SetContentsOpaque(opaque);
 136   if (updater_.get())
 137     updater_->SetOpaque(opaque);
 138 }
 139
 140 void ContentLayer::UpdateCanUseLCDText() {
 141   if (can_use_lcd_text_last_frame_ == can_use_lcd_text())
 142     return;
 143
 144   can_use_lcd_text_last_frame_ = can_use_lcd_text();
 145   if (client_)
 146     client_->DidChangeLayerCanUseLCDText();
 147 }
 148
 149 bool ContentLayer::SupportsLCDText() const {
 150   return true;
 151 }
 152
 153 skia::RefPtr<SkPicture> ContentLayer::GetPicture() const {
 154   if (!DrawsContent())
 155     return skia::RefPtr<SkPicture>();
 156
 157   int width = bounds().width();
 158   int height = bounds().height();
 159   gfx::RectF opaque;
 160
 161   skia::RefPtr<SkPicture> picture = skia::AdoptRef(new SkPicture);
 162   SkCanvas* canvas = picture->beginRecording(width, height);
 163   client_->PaintContents(canvas, gfx::Rect(width, height), &opaque);
 164   picture->endRecording();
 165   return picture;
 166 }
 167
 168 void ContentLayer::OnOutputSurfaceCreated() {
 169   SetTextureFormat(
 170       layer_tree_host()->GetRendererCapabilities().best_texture_format);
 171   TiledLayer::OnOutputSurfaceCreated();
 172 }
 173
 174 }  // namespace cc