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