cc/resources/display_list_recording_source.cc

   1 // Copyright 2014 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/resources/display_list_recording_source.h"
   6
   7 #include <algorithm>
   8
   9 #include "cc/base/histograms.h"
  10 #include "cc/base/region.h"
  11 #include "cc/layers/content_layer_client.h"
  12 #include "cc/resources/display_item_list.h"
  13 #include "cc/resources/display_list_raster_source.h"
  14 #include "skia/ext/analysis_canvas.h"
  15
  16 namespace {
  17
  18 // Layout pixel buffer around the visible layer rect to record.  Any base
  19 // picture that intersects the visible layer rect expanded by this distance
  20 // will be recorded.
  21 const int kPixelDistanceToRecord = 8000;
  22 // We don't perform solid color analysis on images that have more than 10 skia
  23 // operations.
  24 const int kOpCountThatIsOkToAnalyze = 10;
  25
  26 DEFINE_SCOPED_UMA_HISTOGRAM_AREA_TIMER(
  27     ScopedDisplayListRecordingSourceUpdateTimer,
  28     "Compositing.DisplayListRecordingSource.UpdateUs",
  29     "Compositing.DisplayListRecordingSource.UpdateInvalidatedAreaPerMs");
  30
  31 }  // namespace
  32
  33 namespace cc {
  34
  35 DisplayListRecordingSource::DisplayListRecordingSource(
  36     const gfx::Size& grid_cell_size)
  37     : slow_down_raster_scale_factor_for_debug_(0),
  38       gather_pixel_refs_(false),
  39       requires_clear_(false),
  40       is_solid_color_(false),
  41       solid_color_(SK_ColorTRANSPARENT),
  42       background_color_(SK_ColorTRANSPARENT),
  43       pixel_record_distance_(kPixelDistanceToRecord),
  44       grid_cell_size_(grid_cell_size),
  45       is_suitable_for_gpu_rasterization_(true) {
  46 }
  47
  48 DisplayListRecordingSource::~DisplayListRecordingSource() {
  49 }
  50
  51 bool DisplayListRecordingSource::UpdateAndExpandInvalidation(
  52     ContentLayerClient* painter,
  53     Region* invalidation,
  54     const gfx::Size& layer_size,
  55     const gfx::Rect& visible_layer_rect,
  56     int frame_number,
  57     RecordingMode recording_mode) {
  58   ScopedDisplayListRecordingSourceUpdateTimer timer;
  59   bool updated = false;
  60
  61   if (size_ != layer_size) {
  62     size_ = layer_size;
  63     updated = true;
  64   }
  65
  66   gfx::Rect old_recorded_viewport = recorded_viewport_;
  67   recorded_viewport_ = visible_layer_rect;
  68   recorded_viewport_.Inset(-pixel_record_distance_, -pixel_record_distance_);
  69   recorded_viewport_.Intersect(gfx::Rect(GetSize()));
  70
  71   if (recorded_viewport_ != old_recorded_viewport) {
  72     // Invalidate newly-exposed and no-longer-exposed areas.
  73     Region newly_exposed_region(recorded_viewport_);
  74     newly_exposed_region.Subtract(old_recorded_viewport);
  75     invalidation->Union(newly_exposed_region);
  76
  77     Region no_longer_exposed_region(old_recorded_viewport);
  78     no_longer_exposed_region.Subtract(recorded_viewport_);
  79     invalidation->Union(no_longer_exposed_region);
  80
  81     updated = true;
  82   }
  83
  84   // Count the area that is being invalidated.
  85   Region recorded_invalidation(*invalidation);
  86   recorded_invalidation.Intersect(recorded_viewport_);
  87   for (Region::Iterator it(recorded_invalidation); it.has_rect(); it.next())
  88     timer.AddArea(it.rect().size().GetArea());
  89
  90   if (!updated && !invalidation->Intersects(recorded_viewport_))
  91     return false;
  92
  93   ContentLayerClient::PaintingControlSetting painting_control =
  94       ContentLayerClient::PAINTING_BEHAVIOR_NORMAL;
  95
  96   switch (recording_mode) {
  97     case RECORD_NORMALLY:
  98       // Already setup for normal recording.
  99       break;
 100     case RECORD_WITH_SK_NULL_CANVAS:
 101     // TODO(schenney): Remove this when DisplayList recording is the only
 102     // option. For now, fall through and disable construction.
 103     case RECORD_WITH_PAINTING_DISABLED:
 104       painting_control = ContentLayerClient::DISPLAY_LIST_CONSTRUCTION_DISABLED;
 105       break;
 106     case RECORD_WITH_CACHING_DISABLED:
 107       painting_control = ContentLayerClient::DISPLAY_LIST_CACHING_DISABLED;
 108       break;
 109     default:
 110       NOTREACHED();
 111   }
 112
 113   int repeat_count = 1;
 114   if (slow_down_raster_scale_factor_for_debug_ > 1) {
 115     repeat_count = slow_down_raster_scale_factor_for_debug_;
 116     if (painting_control !=
 117         ContentLayerClient::DISPLAY_LIST_CONSTRUCTION_DISABLED) {
 118       painting_control = ContentLayerClient::DISPLAY_LIST_CACHING_DISABLED;
 119     }
 120   }
 121   for (int i = 0; i < repeat_count; ++i) {
 122     const bool use_cached_picture = true;
 123     display_list_ =
 124         DisplayItemList::Create(recorded_viewport_, use_cached_picture);
 125     painter->PaintContentsToDisplayList(display_list_.get(), recorded_viewport_,
 126                                         painting_control);
 127   }
 128   display_list_->CreateAndCacheSkPicture();
 129
 130   is_suitable_for_gpu_rasterization_ =
 131       display_list_->IsSuitableForGpuRasterization();
 132   DetermineIfSolidColor();
 133   display_list_->EmitTraceSnapshot();
 134   if (gather_pixel_refs_)
 135     display_list_->GatherPixelRefs(grid_cell_size_);
 136
 137   return true;
 138 }
 139
 140 gfx::Size DisplayListRecordingSource::GetSize() const {
 141   return size_;
 142 }
 143
 144 void DisplayListRecordingSource::SetEmptyBounds() {
 145   size_ = gfx::Size();
 146   Clear();
 147 }
 148
 149 void DisplayListRecordingSource::SetSlowdownRasterScaleFactor(int factor) {
 150   slow_down_raster_scale_factor_for_debug_ = factor;
 151 }
 152
 153 void DisplayListRecordingSource::SetGatherPixelRefs(bool gather_pixel_refs) {
 154   gather_pixel_refs_ = gather_pixel_refs;
 155 }
 156
 157 void DisplayListRecordingSource::SetBackgroundColor(SkColor background_color) {
 158   background_color_ = background_color;
 159 }
 160
 161 void DisplayListRecordingSource::SetRequiresClear(bool requires_clear) {
 162   requires_clear_ = requires_clear;
 163 }
 164
 165 void DisplayListRecordingSource::SetUnsuitableForGpuRasterizationForTesting() {
 166   is_suitable_for_gpu_rasterization_ = false;
 167 }
 168
 169 bool DisplayListRecordingSource::IsSuitableForGpuRasterization() const {
 170   return is_suitable_for_gpu_rasterization_;
 171 }
 172
 173 scoped_refptr<RasterSource> DisplayListRecordingSource::CreateRasterSource(
 174     bool can_use_lcd_text) const {
 175   return scoped_refptr<RasterSource>(
 176       DisplayListRasterSource::CreateFromDisplayListRecordingSource(
 177           this, can_use_lcd_text));
 178 }
 179
 180 gfx::Size DisplayListRecordingSource::GetTileGridSizeForTesting() const {
 181   return gfx::Size();
 182 }
 183
 184 void DisplayListRecordingSource::DetermineIfSolidColor() {
 185   DCHECK(display_list_.get());
 186   is_solid_color_ = false;
 187   solid_color_ = SK_ColorTRANSPARENT;
 188
 189   if (display_list_->ApproximateOpCount() > kOpCountThatIsOkToAnalyze)
 190     return;
 191
 192   gfx::Size layer_size = GetSize();
 193   skia::AnalysisCanvas canvas(layer_size.width(), layer_size.height());
 194   display_list_->Raster(&canvas, nullptr, 1.f);
 195   is_solid_color_ = canvas.GetColorIfSolid(&solid_color_);
 196 }
 197
 198 void DisplayListRecordingSource::Clear() {
 199   recorded_viewport_ = gfx::Rect();
 200   display_list_ = NULL;
 201   is_solid_color_ = false;
 202 }
 203
 204 }  // namespace cc