cc/resources/gpu_rasterizer.cc

   1 // Copyright 2015 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/gpu_rasterizer.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/bind.h"
  10 #include "base/metrics/histogram.h"
  11 #include "base/trace_event/trace_event.h"
  12 #include "cc/debug/devtools_instrumentation.h"
  13 #include "cc/debug/frame_viewer_instrumentation.h"
  14 #include "cc/output/context_provider.h"
  15 #include "cc/resources/raster_buffer.h"
  16 #include "cc/resources/raster_source.h"
  17 #include "cc/resources/resource.h"
  18 #include "cc/resources/resource_provider.h"
  19 #include "cc/resources/scoped_gpu_raster.h"
  20 #include "cc/resources/tile_manager.h"
  21 #include "gpu/command_buffer/client/gles2_interface.h"
  22 #include "third_party/skia/include/core/SkMultiPictureDraw.h"
  23 #include "third_party/skia/include/core/SkPictureRecorder.h"
  24 #include "third_party/skia/include/core/SkSurface.h"
  25 #include "third_party/skia/include/gpu/GrContext.h"
  26
  27 namespace cc {
  28
  29 // static
  30 scoped_ptr<GpuRasterizer> GpuRasterizer::Create(
  31     ContextProvider* context_provider,
  32     ResourceProvider* resource_provider,
  33     bool use_distance_field_text,
  34     bool threaded_gpu_rasterization_enabled,
  35     int msaa_sample_count) {
  36   return make_scoped_ptr<GpuRasterizer>(new GpuRasterizer(
  37       context_provider, resource_provider, use_distance_field_text,
  38       threaded_gpu_rasterization_enabled, msaa_sample_count));
  39 }
  40
  41 GpuRasterizer::GpuRasterizer(ContextProvider* context_provider,
  42                              ResourceProvider* resource_provider,
  43                              bool use_distance_field_text,
  44                              bool threaded_gpu_rasterization_enabled,
  45                              int msaa_sample_count)
  46     : context_provider_(context_provider),
  47       resource_provider_(resource_provider),
  48       use_distance_field_text_(use_distance_field_text),
  49       threaded_gpu_rasterization_enabled_(threaded_gpu_rasterization_enabled),
  50       msaa_sample_count_(msaa_sample_count) {
  51   DCHECK(context_provider_);
  52 }
  53
  54 GpuRasterizer::~GpuRasterizer() {
  55 }
  56
  57 PrepareTilesMode GpuRasterizer::GetPrepareTilesMode() {
  58   return PrepareTilesMode::PREPARE_NONE;
  59 }
  60
  61 void GpuRasterizer::RasterizeTiles(
  62     const TileVector& tiles,
  63     ResourcePool* resource_pool,
  64     ResourceFormat resource_format,
  65     const UpdateTileDrawInfoCallback& update_tile_draw_info) {
  66   ScopedGpuRaster gpu_raster(context_provider_);
  67
  68   ScopedResourceWriteLocks locks;
  69
  70   for (Tile* tile : tiles) {
  71     RasterSource::SolidColorAnalysis analysis;
  72
  73     if (tile->use_picture_analysis())
  74       PerformSolidColorAnalysis(tile, &analysis);
  75
  76     scoped_ptr<ScopedResource> resource;
  77     if (!analysis.is_solid_color) {
  78       resource = resource_pool->AcquireResource(tile->desired_texture_size(),
  79                                                 resource_format);
  80       AddToMultiPictureDraw(tile, resource.get(), &locks);
  81     }
  82     update_tile_draw_info.Run(tile, resource.Pass(), analysis);
  83   }
  84
  85   // If MSAA is enabled, tell Skia to resolve each render target after draw.
  86   multi_picture_draw_.draw(msaa_sample_count_ > 0);
  87 }
  88
  89 void GpuRasterizer::PerformSolidColorAnalysis(
  90     const Tile* tile,
  91     RasterSource::SolidColorAnalysis* analysis) {
  92   const void* tile_id = static_cast<const void*>(tile);
  93   frame_viewer_instrumentation::ScopedAnalyzeTask analyze_task(
  94       tile_id, tile->combined_priority().resolution,
  95       tile->source_frame_number(), tile->layer_id());
  96
  97   DCHECK(tile->raster_source());
  98
  99   tile->raster_source()->PerformSolidColorAnalysis(
 100       tile->content_rect(), tile->contents_scale(), analysis);
 101
 102   // Record the solid color prediction.
 103   UMA_HISTOGRAM_BOOLEAN("Renderer4.SolidColorTilesAnalyzed",
 104                         analysis->is_solid_color);
 105 }
 106
 107 void GpuRasterizer::AddToMultiPictureDraw(const Tile* tile,
 108                                           const ScopedResource* resource,
 109                                           ScopedResourceWriteLocks* locks) {
 110   const void* tile_id = static_cast<const void*>(tile);
 111   frame_viewer_instrumentation::ScopedRasterTask raster_task(
 112       tile_id, tile->combined_priority().resolution,
 113       tile->source_frame_number(), tile->layer_id());
 114
 115   DCHECK(tile->raster_source());
 116
 117   // Turn on distance fields for layers that have ever animated.
 118   bool use_distance_field_text =
 119       use_distance_field_text_ ||
 120       tile->raster_source()->ShouldAttemptToUseDistanceFieldText();
 121   scoped_ptr<ResourceProvider::ScopedWriteLockGr> lock(
 122       new ResourceProvider::ScopedWriteLockGr(
 123           resource_provider_, resource->id(), use_distance_field_text,
 124           tile->raster_source()->CanUseLCDText(), msaa_sample_count_));
 125
 126   SkSurface* sk_surface = lock->get_sk_surface();
 127   if (!sk_surface)
 128     return;
 129
 130   locks->push_back(lock.Pass());
 131
 132   SkRTreeFactory factory;
 133   SkPictureRecorder recorder;
 134   gfx::Size size = resource->size();
 135   const int flags = SkPictureRecorder::kComputeSaveLayerInfo_RecordFlag;
 136   skia::RefPtr<SkCanvas> canvas = skia::SharePtr(
 137       recorder.beginRecording(size.width(), size.height(), &factory, flags));
 138
 139   canvas->save();
 140   tile->raster_source()->PlaybackToCanvas(canvas.get(), tile->content_rect(),
 141                                           tile->contents_scale());
 142   canvas->restore();
 143
 144   // Add the canvas and recorded picture to |multi_picture_draw_|.
 145   skia::RefPtr<SkPicture> picture = skia::AdoptRef(recorder.endRecording());
 146   multi_picture_draw_.add(sk_surface->getCanvas(), picture.get());
 147 }
 148
 149 }  // namespace cc