cc/resources/drawing_display_item.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/drawing_display_item.h"
   6
   7 #include <string>
   8
   9 #include "base/strings/stringprintf.h"
  10 #include "base/trace_event/trace_event_argument.h"
  11 #include "cc/debug/picture_debug_util.h"
  12 #include "third_party/skia/include/core/SkCanvas.h"
  13 #include "third_party/skia/include/core/SkDrawPictureCallback.h"
  14 #include "third_party/skia/include/core/SkMatrix.h"
  15 #include "third_party/skia/include/core/SkPicture.h"
  16 #include "third_party/skia/include/utils/SkPictureUtils.h"
  17
  18 namespace cc {
  19
  20 DrawingDisplayItem::DrawingDisplayItem(skia::RefPtr<SkPicture> picture)
  21     : picture_(picture) {
  22 }
  23
  24 DrawingDisplayItem::~DrawingDisplayItem() {
  25 }
  26
  27 void DrawingDisplayItem::Raster(SkCanvas* canvas,
  28                                 SkDrawPictureCallback* callback) const {
  29   canvas->save();
  30   if (callback)
  31     picture_->playback(canvas, callback);
  32   else
  33     canvas->drawPicture(picture_.get());
  34   canvas->restore();
  35 }
  36
  37 void DrawingDisplayItem::RasterForTracing(SkCanvas* canvas) const {
  38   canvas->save();
  39   // The picture debugger in about:tracing doesn't drill down into |drawPicture|
  40   // operations. Calling |playback()| rather than |drawPicture()| causes the
  41   // skia operations in |picture_| to appear individually in the picture
  42   // produced for tracing rather than being hidden inside a drawPicture
  43   // operation.
  44   picture_->playback(canvas);
  45   canvas->restore();
  46 }
  47
  48 bool DrawingDisplayItem::IsSuitableForGpuRasterization() const {
  49   return picture_->suitableForGpuRasterization(NULL);
  50 }
  51
  52 int DrawingDisplayItem::ApproximateOpCount() const {
  53   return picture_->approximateOpCount();
  54 }
  55
  56 size_t DrawingDisplayItem::PictureMemoryUsage() const {
  57   DCHECK(picture_);
  58   return SkPictureUtils::ApproximateBytesUsed(picture_.get());
  59 }
  60
  61 void DrawingDisplayItem::AsValueInto(
  62     base::trace_event::TracedValue* array) const {
  63   array->BeginDictionary();
  64   array->SetString("name", "DrawingDisplayItem");
  65   array->SetString(
  66       "cullRect",
  67       base::StringPrintf("[%f,%f,%f,%f]", picture_->cullRect().x(),
  68                          picture_->cullRect().y(), picture_->cullRect().width(),
  69                          picture_->cullRect().height()));
  70   std::string b64_picture;
  71   PictureDebugUtil::SerializeAsBase64(picture_.get(), &b64_picture);
  72   array->SetString("skp64", b64_picture);
  73   array->EndDictionary();
  74 }
  75
  76 }  // namespace cc