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