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       can_use_lcd_text_(true),
  32       is_solid_color_(false),
  33       solid_color_(SK_ColorTRANSPARENT),
  34       pixel_record_distance_(kPixelDistanceToRecord),
  35       is_suitable_for_gpu_rasterization_(true) {
  36 }
  37
  38 DisplayListRecordingSource::~DisplayListRecordingSource() {
  39 }
  40
  41 bool DisplayListRecordingSource::UpdateAndExpandInvalidation(
  42     ContentLayerClient* painter,
  43     Region* invalidation,
  44     bool can_use_lcd_text,
  45     const gfx::Size& layer_size,
  46     const gfx::Rect& visible_layer_rect,
  47     int frame_number,
  48     RecordingMode recording_mode) {
  49   bool updated = false;
  50
  51   if (size_ != layer_size) {
  52     size_ = layer_size;
  53     updated = true;
  54   }
  55
  56   if (can_use_lcd_text_ != can_use_lcd_text) {
  57     can_use_lcd_text_ = can_use_lcd_text;
  58     invalidation->Union(gfx::Rect(GetSize()));
  59     updated = true;
  60   }
  61
  62   gfx::Rect old_recorded_viewport = recorded_viewport_;
  63   // TODO(wangxianzhu): Blink slimming paint doesn't support incremental
  64   // painting for now so we must record for the whole layer. Should measure
  65   // performance and determine the best choice. Consider display item caching.
  66   recorded_viewport_ = gfx::Rect(GetSize());
  67
  68   if (recorded_viewport_ != old_recorded_viewport) {
  69     // Invalidate newly-exposed and no-longer-exposed areas.
  70     Region newly_exposed_region(recorded_viewport_);
  71     newly_exposed_region.Subtract(old_recorded_viewport);
  72     invalidation->Union(newly_exposed_region);
  73
  74     Region no_longer_exposed_region(old_recorded_viewport);
  75     no_longer_exposed_region.Subtract(recorded_viewport_);
  76     invalidation->Union(no_longer_exposed_region);
  77
  78     updated = true;
  79   }
  80
  81   if (!updated && !invalidation->Intersects(recorded_viewport_))
  82     return false;
  83
  84   ContentLayerClient::PaintingControlSetting painting_control =
  85       ContentLayerClient::PAINTING_BEHAVIOR_NORMAL;
  86
  87   switch (recording_mode) {
  88     case RECORD_NORMALLY:
  89       // Already setup for normal recording.
  90       break;
  91     case RECORD_WITH_SK_NULL_CANVAS:
  92     // TODO(schenney): Remove this when DisplayList recording is the only
  93     // option. For now, fall through and disable construction.
  94     case RECORD_WITH_PAINTING_DISABLED:
  95       painting_control = ContentLayerClient::DISPLAY_LIST_CONSTRUCTION_DISABLED;
  96       break;
  97     case RECORD_WITH_CACHING_DISABLED:
  98       painting_control = ContentLayerClient::DISPLAY_LIST_CACHING_DISABLED;
  99       break;
 100     default:
 101       NOTREACHED();
 102   }
 103
 104   int repeat_count = 1;
 105   if (slow_down_raster_scale_factor_for_debug_ > 1) {
 106     repeat_count = slow_down_raster_scale_factor_for_debug_;
 107     if (painting_control !=
 108         ContentLayerClient::DISPLAY_LIST_CONSTRUCTION_DISABLED) {
 109       painting_control = ContentLayerClient::DISPLAY_LIST_CACHING_DISABLED;
 110     }
 111   }
 112   for (int i = 0; i < repeat_count; ++i) {
 113     display_list_ = painter->PaintContentsToDisplayList(recorded_viewport_,
 114                                                         painting_control);
 115   }
 116   display_list_->set_layer_rect(recorded_viewport_);
 117   is_suitable_for_gpu_rasterization_ =
 118       display_list_->IsSuitableForGpuRasterization();
 119
 120   DetermineIfSolidColor();
 121   display_list_->EmitTraceSnapshot();
 122   return true;
 123 }
 124
 125 gfx::Size DisplayListRecordingSource::GetSize() const {
 126   return size_;
 127 }
 128
 129 void DisplayListRecordingSource::SetEmptyBounds() {
 130   size_ = gfx::Size();
 131   Clear();
 132 }
 133
 134 void DisplayListRecordingSource::SetSlowdownRasterScaleFactor(int factor) {
 135   slow_down_raster_scale_factor_for_debug_ = factor;
 136 }
 137
 138 void DisplayListRecordingSource::SetUnsuitableForGpuRasterizationForTesting() {
 139   is_suitable_for_gpu_rasterization_ = false;
 140 }
 141
 142 bool DisplayListRecordingSource::IsSuitableForGpuRasterization() const {
 143   return is_suitable_for_gpu_rasterization_;
 144 }
 145
 146 scoped_refptr<RasterSource> DisplayListRecordingSource::CreateRasterSource()
 147     const {
 148   return scoped_refptr<RasterSource>(
 149       DisplayListRasterSource::CreateFromDisplayListRecordingSource(this));
 150 }
 151
 152 gfx::Size DisplayListRecordingSource::GetTileGridSizeForTesting() const {
 153   return gfx::Size();
 154 }
 155
 156 void DisplayListRecordingSource::DetermineIfSolidColor() {
 157   DCHECK(display_list_.get());
 158   is_solid_color_ = false;
 159   solid_color_ = SK_ColorTRANSPARENT;
 160
 161   if (display_list_->ApproximateOpCount() > kOpCountThatIsOkToAnalyze)
 162     return;
 163
 164   gfx::Size layer_size = GetSize();
 165   skia::AnalysisCanvas canvas(layer_size.width(), layer_size.height());
 166   display_list_->Raster(&canvas, nullptr, 1.f);
 167   is_solid_color_ = canvas.GetColorIfSolid(&solid_color_);
 168 }
 169
 170 void DisplayListRecordingSource::Clear() {
 171   recorded_viewport_ = gfx::Rect();
 172   display_list_ = NULL;
 173   is_solid_color_ = false;
 174 }
 175
 176 }  // namespace cc