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     : slow_down_raster_scale_factor_for_debug_(0),
  31       gather_pixel_refs_(false),
  32       requires_clear_(false),
  33       is_solid_color_(false),
  34       solid_color_(SK_ColorTRANSPARENT),
  35       background_color_(SK_ColorTRANSPARENT),
  36       pixel_record_distance_(kPixelDistanceToRecord),
  37       is_suitable_for_gpu_rasterization_(true) {
  38 }
  39
  40 DisplayListRecordingSource::~DisplayListRecordingSource() {
  41 }
  42
  43 bool DisplayListRecordingSource::UpdateAndExpandInvalidation(
  44     ContentLayerClient* painter,
  45     Region* invalidation,
  46     const gfx::Size& layer_size,
  47     const gfx::Rect& visible_layer_rect,
  48     int frame_number,
  49     RecordingMode recording_mode) {
  50   bool updated = false;
  51
  52   if (size_ != layer_size) {
  53     size_ = layer_size;
  54     updated = true;
  55   }
  56
  57   gfx::Rect old_recorded_viewport = recorded_viewport_;
  58   recorded_viewport_ = visible_layer_rect;
  59   recorded_viewport_.Inset(-pixel_record_distance_, -pixel_record_distance_);
  60   recorded_viewport_.Intersect(gfx::Rect(GetSize()));
  61
  62   if (recorded_viewport_ != old_recorded_viewport) {
  63     // Invalidate newly-exposed and no-longer-exposed areas.
  64     Region newly_exposed_region(recorded_viewport_);
  65     newly_exposed_region.Subtract(old_recorded_viewport);
  66     invalidation->Union(newly_exposed_region);
  67
  68     Region no_longer_exposed_region(old_recorded_viewport);
  69     no_longer_exposed_region.Subtract(recorded_viewport_);
  70     invalidation->Union(no_longer_exposed_region);
  71
  72     updated = true;
  73   }
  74
  75   if (!updated && !invalidation->Intersects(recorded_viewport_))
  76     return false;
  77
  78   ContentLayerClient::PaintingControlSetting painting_control =
  79       ContentLayerClient::PAINTING_BEHAVIOR_NORMAL;
  80
  81   switch (recording_mode) {
  82     case RECORD_NORMALLY:
  83       // Already setup for normal recording.
  84       break;
  85     case RECORD_WITH_SK_NULL_CANVAS:
  86     // TODO(schenney): Remove this when DisplayList recording is the only
  87     // option. For now, fall through and disable construction.
  88     case RECORD_WITH_PAINTING_DISABLED:
  89       painting_control = ContentLayerClient::DISPLAY_LIST_CONSTRUCTION_DISABLED;
  90       break;
  91     case RECORD_WITH_CACHING_DISABLED:
  92       painting_control = ContentLayerClient::DISPLAY_LIST_CACHING_DISABLED;
  93       break;
  94     default:
  95       NOTREACHED();
  96   }
  97
  98   int repeat_count = 1;
  99   if (slow_down_raster_scale_factor_for_debug_ > 1) {
 100     repeat_count = slow_down_raster_scale_factor_for_debug_;
 101     if (painting_control !=
 102         ContentLayerClient::DISPLAY_LIST_CONSTRUCTION_DISABLED) {
 103       painting_control = ContentLayerClient::DISPLAY_LIST_CACHING_DISABLED;
 104     }
 105   }
 106   for (int i = 0; i < repeat_count; ++i) {
 107     display_list_ = painter->PaintContentsToDisplayList(recorded_viewport_,
 108                                                         painting_control);
 109   }
 110   display_list_->set_layer_rect(recorded_viewport_);
 111   is_suitable_for_gpu_rasterization_ =
 112       display_list_->IsSuitableForGpuRasterization();
 113
 114   DetermineIfSolidColor();
 115   display_list_->EmitTraceSnapshot();
 116
 117   display_list_->CreateAndCacheSkPicture();
 118
 119   return true;
 120 }
 121
 122 void DisplayListRecordingSource::DidMoveToNewCompositor() {
 123   // No invalidation history to worry about here.
 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