Add protobuf serialization to DisplayItemList

cc/playback/drawing_display_item.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/playback/drawing_display_item.h"
 
 #include <string>
 
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "cc/debug/picture_debug_util.h"
+#include "cc/proto/display_item.pb.h"
 #include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkData.h"
 #include "third_party/skia/include/core/SkMatrix.h"
 #include "third_party/skia/include/core/SkPicture.h"
+#include "third_party/skia/include/core/SkStream.h"
 #include "third_party/skia/include/utils/SkPictureUtils.h"
 #include "ui/gfx/skia_util.h"
 
 namespace cc {
 
 DrawingDisplayItem::DrawingDisplayItem() {
 }
 
 DrawingDisplayItem::~DrawingDisplayItem() {
 }
 
 void DrawingDisplayItem::SetNew(skia::RefPtr<SkPicture> picture) {
   picture_ = picture.Pass();
   DisplayItem::SetNew(picture_->suitableForGpuRasterization(NULL),
                       picture_->approximateOpCount(),
                       SkPictureUtils::ApproximateBytesUsed(picture_.get()));
 }
 
+void DrawingDisplayItem::ToProtobuf(proto::DisplayItem* proto) const {
+  proto->set_type(proto::DisplayItem::Type_Drawing);
+
+  proto::DrawingDisplayItem* details = proto->mutable_drawing_item();
+
+  // Just use skia's serialize() method for now.
+  if (picture_) {
+    SkDynamicMemoryWStream stream;
+
+    // TODO(dtrainor, nyquist): Add an SkPixelSerializer to not serialize images
+    // more than once (crbug.com/548434).
+    picture_->serialize(&stream, nullptr);
+    if (stream.bytesWritten() > 0) {
+      SkAutoDataUnref data(stream.copyToData());
+      details->set_picture(data->data(), data->size());
+    }
+  }
+}
+
+void DrawingDisplayItem::FromProtobuf(const proto::DisplayItem& proto) {
+  DCHECK_EQ(proto::DisplayItem::Type_Drawing, proto.type());
+
+  skia::RefPtr<SkPicture> picture;
+  const proto::DrawingDisplayItem& details = proto.drawing_item();
+  if (details.has_picture()) {
+    SkMemoryStream stream(details.picture().data(), details.picture().size());
+
+    // TODO(dtrainor, nyquist): Add an image decoder.
+    picture = skia::AdoptRef(SkPicture::CreateFromStream(&stream, nullptr));
+  }
+
+  SetNew(picture.Pass());
+}
+
 void DrawingDisplayItem::Raster(SkCanvas* canvas,
                                 const gfx::Rect& canvas_target_playback_rect,
                                 SkPicture::AbortCallback* callback) const {
   // The canvas_playback_rect can be empty to signify no culling is desired.
   if (!canvas_target_playback_rect.IsEmpty()) {
     const SkMatrix& matrix = canvas->getTotalMatrix();
     const SkRect& cull_rect = picture_->cullRect();
     SkRect target_rect;
     matrix.mapRect(&target_rect, cull_rect);
     if (!target_rect.intersect(gfx::RectToSkRect(canvas_target_playback_rect)))
@@ skipping 21 matching lines @@
   PictureDebugUtil::SerializeAsBase64(picture_.get(), &b64_picture);
   array->SetString("skp64", b64_picture);
   array->EndDictionary();
 }
 
 void DrawingDisplayItem::CloneTo(DrawingDisplayItem* item) const {
   item->SetNew(picture_);
 }
 
 }  // namespace cc