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 GpuRasterizer::GpuRasterizer(ContextProvider* context_provider,
  30                              ResourceProvider* resource_provider,
  31                              bool use_distance_field_text,
  32                              int msaa_sample_count)
  33     : resource_provider_(resource_provider),
  34       use_distance_field_text_(use_distance_field_text),
  35       msaa_sample_count_(msaa_sample_count) {
  36 }
  37
  38 GpuRasterizer::~GpuRasterizer() {
  39 }
  40
  41 void GpuRasterizer::RasterizeSource(
  42     ResourceProvider::ScopedWriteLockGr* write_lock,
  43     const RasterSource* raster_source,
  44     const gfx::Rect& rect,
  45     float scale) {
  46   // Play back raster_source into temp SkPicture.
  47   SkPictureRecorder recorder;
  48   gfx::Size size = write_lock->resource()->size;
  49   const int flags = SkPictureRecorder::kComputeSaveLayerInfo_RecordFlag;
  50   skia::RefPtr<SkCanvas> canvas = skia::SharePtr(
  51       recorder.beginRecording(size.width(), size.height(), NULL, flags));
  52   canvas->save();
  53   raster_source->PlaybackToCanvas(canvas.get(), rect, scale);
  54   canvas->restore();
  55   skia::RefPtr<SkPicture> picture = skia::AdoptRef(recorder.endRecording());
  56
  57   // Turn on distance fields for layers that have ever animated.
  58   bool use_distance_field_text =
  59       use_distance_field_text_ ||
  60       raster_source->ShouldAttemptToUseDistanceFieldText();
  61
  62   // Playback picture into resource.
  63   {
  64     ScopedGpuRaster gpu_raster(
  65         resource_provider_->output_surface()->worker_context_provider());
  66     write_lock->InitSkSurface(use_distance_field_text,
  67                               raster_source->CanUseLCDText(),
  68                               msaa_sample_count_);
  69
  70     SkSurface* sk_surface = write_lock->sk_surface();
  71
  72     // Allocating an SkSurface will fail after a lost context.  Pretend we
  73     // rasterized, as the contents of the resource don't matter anymore.
  74     if (!sk_surface)
  75       return;
  76
  77     SkMultiPictureDraw multi_picture_draw;
  78     multi_picture_draw.add(sk_surface->getCanvas(), picture.get());
  79     multi_picture_draw.draw(msaa_sample_count_ > 0);
  80     write_lock->ReleaseSkSurface();
  81   }
  82 }
  83
  84 }  // namespace cc