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     : slow_down_raster_scale_factor_for_debug_(0),
  32       gather_pixel_refs_(false),
  33       requires_clear_(false),
  34       is_solid_color_(false),
  35       solid_color_(SK_ColorTRANSPARENT),
  36       background_color_(SK_ColorTRANSPARENT),
  37       pixel_record_distance_(kPixelDistanceToRecord),
  38       grid_cell_size_(grid_cell_size),
  39       is_suitable_for_gpu_rasterization_(true) {
  40 }
  41
  42 DisplayListRecordingSource::~DisplayListRecordingSource() {
  43 }
  44
  45 bool DisplayListRecordingSource::UpdateAndExpandInvalidation(
  46     ContentLayerClient* painter,
  47     Region* invalidation,
  48     const gfx::Size& layer_size,
  49     const gfx::Rect& visible_layer_rect,
  50     int frame_number,
  51     RecordingMode recording_mode) {
  52   bool updated = false;
  53
  54   if (size_ != layer_size) {
  55     size_ = layer_size;
  56     updated = true;
  57   }
  58
  59   gfx::Rect old_recorded_viewport = recorded_viewport_;
  60   recorded_viewport_ = visible_layer_rect;
  61   recorded_viewport_.Inset(-pixel_record_distance_, -pixel_record_distance_);
  62   recorded_viewport_.Intersect(gfx::Rect(GetSize()));
  63
  64   if (recorded_viewport_ != old_recorded_viewport) {
  65     // Invalidate newly-exposed and no-longer-exposed areas.
  66     Region newly_exposed_region(recorded_viewport_);
  67     newly_exposed_region.Subtract(old_recorded_viewport);
  68     invalidation->Union(newly_exposed_region);
  69
  70     Region no_longer_exposed_region(old_recorded_viewport);
  71     no_longer_exposed_region.Subtract(recorded_viewport_);
  72     invalidation->Union(no_longer_exposed_region);
  73
  74     updated = true;
  75   }
  76
  77   if (!updated && !invalidation->Intersects(recorded_viewport_))
  78     return false;
  79
  80   ContentLayerClient::PaintingControlSetting painting_control =
  81       ContentLayerClient::PAINTING_BEHAVIOR_NORMAL;
  82
  83   switch (recording_mode) {
  84     case RECORD_NORMALLY:
  85       // Already setup for normal recording.
  86       break;
  87     case RECORD_WITH_SK_NULL_CANVAS:
  88     // TODO(schenney): Remove this when DisplayList recording is the only
  89     // option. For now, fall through and disable construction.
  90     case RECORD_WITH_PAINTING_DISABLED:
  91       painting_control = ContentLayerClient::DISPLAY_LIST_CONSTRUCTION_DISABLED;
  92       break;
  93     case RECORD_WITH_CACHING_DISABLED:
  94       painting_control = ContentLayerClient::DISPLAY_LIST_CACHING_DISABLED;
  95       break;
  96     default:
  97       NOTREACHED();
  98   }
  99
 100   int repeat_count = 1;
 101   if (slow_down_raster_scale_factor_for_debug_ > 1) {
 102     repeat_count = slow_down_raster_scale_factor_for_debug_;
 103     if (painting_control !=
 104         ContentLayerClient::DISPLAY_LIST_CONSTRUCTION_DISABLED) {
 105       painting_control = ContentLayerClient::DISPLAY_LIST_CACHING_DISABLED;
 106     }
 107   }
 108   for (int i = 0; i < repeat_count; ++i) {
 109     display_list_ = painter->PaintContentsToDisplayList(recorded_viewport_,
 110                                                         painting_control);
 111   }
 112   display_list_->set_layer_rect(recorded_viewport_);
 113   is_suitable_for_gpu_rasterization_ =
 114       display_list_->IsSuitableForGpuRasterization();
 115
 116   DetermineIfSolidColor();
 117   display_list_->EmitTraceSnapshot();
 118
 119   display_list_->CreateAndCacheSkPicture();
 120   if (gather_pixel_refs_)
 121     display_list_->GatherPixelRefs(grid_cell_size_);
 122
 123   return true;
 124 }
 125
 126 gfx::Size DisplayListRecordingSource::GetSize() const {
 127   return size_;
 128 }
 129
 130 void DisplayListRecordingSource::SetEmptyBounds() {
 131   size_ = gfx::Size();
 132   Clear();
 133 }
 134
 135 void DisplayListRecordingSource::SetSlowdownRasterScaleFactor(int factor) {
 136   slow_down_raster_scale_factor_for_debug_ = factor;
 137 }
 138
 139 void DisplayListRecordingSource::SetGatherPixelRefs(bool gather_pixel_refs) {
 140   gather_pixel_refs_ = gather_pixel_refs;
 141 }
 142
 143 void DisplayListRecordingSource::SetBackgroundColor(SkColor background_color) {
 144   background_color_ = background_color;
 145 }
 146
 147 void DisplayListRecordingSource::SetRequiresClear(bool requires_clear) {
 148   requires_clear_ = requires_clear;
 149 }
 150
 151 void DisplayListRecordingSource::SetUnsuitableForGpuRasterizationForTesting() {
 152   is_suitable_for_gpu_rasterization_ = false;
 153 }
 154
 155 bool DisplayListRecordingSource::IsSuitableForGpuRasterization() const {
 156   return is_suitable_for_gpu_rasterization_;
 157 }
 158
 159 scoped_refptr<RasterSource> DisplayListRecordingSource::CreateRasterSource(
 160     bool can_use_lcd_text) const {
 161   return scoped_refptr<RasterSource>(
 162       DisplayListRasterSource::CreateFromDisplayListRecordingSource(
 163           this, can_use_lcd_text));
 164 }
 165
 166 gfx::Size DisplayListRecordingSource::GetTileGridSizeForTesting() const {
 167   return gfx::Size();
 168 }
 169
 170 void DisplayListRecordingSource::DetermineIfSolidColor() {
 171   DCHECK(display_list_.get());
 172   is_solid_color_ = false;
 173   solid_color_ = SK_ColorTRANSPARENT;
 174
 175   if (display_list_->ApproximateOpCount() > kOpCountThatIsOkToAnalyze)
 176     return;
 177
 178   gfx::Size layer_size = GetSize();
 179   skia::AnalysisCanvas canvas(layer_size.width(), layer_size.height());
 180   display_list_->Raster(&canvas, nullptr, 1.f);
 181   is_solid_color_ = canvas.GetColorIfSolid(&solid_color_);
 182 }
 183
 184 void DisplayListRecordingSource::Clear() {
 185   recorded_viewport_ = gfx::Rect();
 186   display_list_ = NULL;
 187   is_solid_color_ = false;
 188 }
 189
 190 }  // namespace cc