cc/playback/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/playback/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/playback/display_item_list.h"
  13 #include "cc/playback/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 #ifdef NDEBUG
  27 const bool kDefaultClearCanvasSetting = false;
  28 #else
  29 const bool kDefaultClearCanvasSetting = true;
  30 #endif
  31
  32 DEFINE_SCOPED_UMA_HISTOGRAM_AREA_TIMER(
  33     ScopedDisplayListRecordingSourceUpdateTimer,
  34     "Compositing.DisplayListRecordingSource.UpdateUs",
  35     "Compositing.DisplayListRecordingSource.UpdateInvalidatedAreaPerMs");
  36
  37 }  // namespace
  38
  39 namespace cc {
  40
  41 DisplayListRecordingSource::DisplayListRecordingSource(
  42     const gfx::Size& grid_cell_size)
  43     : slow_down_raster_scale_factor_for_debug_(0),
  44       gather_pixel_refs_(false),
  45       requires_clear_(false),
  46       is_solid_color_(false),
  47       clear_canvas_with_debug_color_(kDefaultClearCanvasSetting),
  48       solid_color_(SK_ColorTRANSPARENT),
  49       background_color_(SK_ColorTRANSPARENT),
  50       pixel_record_distance_(kPixelDistanceToRecord),
  51       grid_cell_size_(grid_cell_size),
  52       is_suitable_for_gpu_rasterization_(true) {
  53 }
  54
  55 DisplayListRecordingSource::~DisplayListRecordingSource() {
  56 }
  57
  58 bool DisplayListRecordingSource::UpdateAndExpandInvalidation(
  59     ContentLayerClient* painter,
  60     Region* invalidation,
  61     const gfx::Size& layer_size,
  62     const gfx::Rect& visible_layer_rect,
  63     int frame_number,
  64     RecordingMode recording_mode) {
  65   ScopedDisplayListRecordingSourceUpdateTimer timer;
  66   bool updated = false;
  67
  68   if (size_ != layer_size) {
  69     size_ = layer_size;
  70     updated = true;
  71   }
  72
  73   gfx::Rect old_recorded_viewport = recorded_viewport_;
  74   recorded_viewport_ = visible_layer_rect;
  75   recorded_viewport_.Inset(-pixel_record_distance_, -pixel_record_distance_);
  76   recorded_viewport_.Intersect(gfx::Rect(GetSize()));
  77
  78   if (recorded_viewport_ != old_recorded_viewport) {
  79     // Invalidate newly-exposed and no-longer-exposed areas.
  80     Region newly_exposed_region(recorded_viewport_);
  81     newly_exposed_region.Subtract(old_recorded_viewport);
  82     invalidation->Union(newly_exposed_region);
  83
  84     Region no_longer_exposed_region(old_recorded_viewport);
  85     no_longer_exposed_region.Subtract(recorded_viewport_);
  86     invalidation->Union(no_longer_exposed_region);
  87
  88     updated = true;
  89   }
  90
  91   // Count the area that is being invalidated.
  92   Region recorded_invalidation(*invalidation);
  93   recorded_invalidation.Intersect(recorded_viewport_);
  94   for (Region::Iterator it(recorded_invalidation); it.has_rect(); it.next())
  95     timer.AddArea(it.rect().size().GetArea());
  96
  97   if (!updated && !invalidation->Intersects(recorded_viewport_))
  98     return false;
  99
 100   ContentLayerClient::PaintingControlSetting painting_control =
 101       ContentLayerClient::PAINTING_BEHAVIOR_NORMAL;
 102
 103   switch (recording_mode) {
 104     case RECORD_NORMALLY:
 105       // Already setup for normal recording.
 106       break;
 107     case RECORD_WITH_PAINTING_DISABLED:
 108       painting_control = ContentLayerClient::DISPLAY_LIST_PAINTING_DISABLED;
 109       break;
 110     case RECORD_WITH_CACHING_DISABLED:
 111       painting_control = ContentLayerClient::DISPLAY_LIST_CACHING_DISABLED;
 112       break;
 113     case RECORD_WITH_CONSTRUCTION_DISABLED:
 114       painting_control = ContentLayerClient::DISPLAY_LIST_CONSTRUCTION_DISABLED;
 115       break;
 116     default:
 117       // case RecordingSource::RECORD_WITH_SK_NULL_CANVAS should not be reached
 118       NOTREACHED();
 119   }
 120
 121   int repeat_count = 1;
 122   if (slow_down_raster_scale_factor_for_debug_ > 1) {
 123     repeat_count = slow_down_raster_scale_factor_for_debug_;
 124     painting_control = ContentLayerClient::DISPLAY_LIST_CACHING_DISABLED;
 125   }
 126
 127   for (int i = 0; i < repeat_count; ++i) {
 128     display_list_ = painter->PaintContentsToDisplayList(recorded_viewport_,
 129                                                         painting_control);
 130   }
 131
 132   is_suitable_for_gpu_rasterization_ =
 133       display_list_->IsSuitableForGpuRasterization();
 134   DetermineIfSolidColor();
 135   display_list_->EmitTraceSnapshot();
 136   if (gather_pixel_refs_)
 137     display_list_->GatherPixelRefs(grid_cell_size_);
 138
 139   return true;
 140 }
 141
 142 gfx::Size DisplayListRecordingSource::GetSize() const {
 143   return size_;
 144 }
 145
 146 void DisplayListRecordingSource::SetEmptyBounds() {
 147   size_ = gfx::Size();
 148   Clear();
 149 }
 150
 151 void DisplayListRecordingSource::SetSlowdownRasterScaleFactor(int factor) {
 152   slow_down_raster_scale_factor_for_debug_ = factor;
 153 }
 154
 155 void DisplayListRecordingSource::SetGatherPixelRefs(bool gather_pixel_refs) {
 156   gather_pixel_refs_ = gather_pixel_refs;
 157 }
 158
 159 void DisplayListRecordingSource::SetBackgroundColor(SkColor background_color) {
 160   background_color_ = background_color;
 161 }
 162
 163 void DisplayListRecordingSource::SetRequiresClear(bool requires_clear) {
 164   requires_clear_ = requires_clear;
 165 }
 166
 167 void DisplayListRecordingSource::SetUnsuitableForGpuRasterizationForTesting() {
 168   is_suitable_for_gpu_rasterization_ = false;
 169 }
 170
 171 bool DisplayListRecordingSource::IsSuitableForGpuRasterization() const {
 172   return is_suitable_for_gpu_rasterization_;
 173 }
 174
 175 scoped_refptr<RasterSource> DisplayListRecordingSource::CreateRasterSource(
 176     bool can_use_lcd_text) const {
 177   return scoped_refptr<RasterSource>(
 178       DisplayListRasterSource::CreateFromDisplayListRecordingSource(
 179           this, can_use_lcd_text));
 180 }
 181
 182 gfx::Size DisplayListRecordingSource::GetTileGridSizeForTesting() const {
 183   return gfx::Size();
 184 }
 185
 186 void DisplayListRecordingSource::DetermineIfSolidColor() {
 187   DCHECK(display_list_.get());
 188   is_solid_color_ = false;
 189   solid_color_ = SK_ColorTRANSPARENT;
 190
 191   if (display_list_->ApproximateOpCount() > kOpCountThatIsOkToAnalyze)
 192     return;
 193
 194   gfx::Size layer_size = GetSize();
 195   skia::AnalysisCanvas canvas(layer_size.width(), layer_size.height());
 196   display_list_->Raster(&canvas, nullptr, 1.f);
 197   is_solid_color_ = canvas.GetColorIfSolid(&solid_color_);
 198 }
 199
 200 void DisplayListRecordingSource::Clear() {
 201   recorded_viewport_ = gfx::Rect();
 202   display_list_ = NULL;
 203   is_solid_color_ = false;
 204 }
 205
 206 }  // namespace cc