[blimp] Add SkPicture caching support.

cc/blimp/picture_data_conversions_unittest.cc

+// Copyright 2016 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/blimp/picture_data_conversions.h"
+
+#include <memory>
+#include <set>
+
+#include "base/logging.h"
+#include "base/memory/ptr_util.h"
+#include "cc/blimp/picture_data.h"
+#include "cc/proto/layer_tree_host.pb.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "third_party/skia/include/core/SkData.h"
+#include "third_party/skia/include/core/SkPicture.h"
+#include "third_party/skia/include/core/SkPictureRecorder.h"
+#include "third_party/skia/include/core/SkRefCnt.h"
+#include "third_party/skia/include/core/SkStream.h"
+
+namespace cc {
+namespace {
+sk_sp<const SkPicture> CreateSkPicture(SkColor color) {
+  SkPictureRecorder recorder;
+  sk_sp<SkCanvas> canvas =
+      sk_ref_sp(recorder.beginRecording(SkRect::MakeWH(1, 1)));
+  canvas->drawColor(color);
+  return recorder.finishRecordingAsPicture();
+}
+
+sk_sp<SkData> SerializePicture(sk_sp<const SkPicture> picture) {
+  SkDynamicMemoryWStream stream;
+  picture->serialize(&stream, nullptr);
+  DCHECK(stream.bytesWritten());
+  return sk_sp<SkData>(stream.copyToData());
+}
+
+bool SamePicture(sk_sp<const SkPicture> picture,
+                 const PictureData& picture_data) {
+  if (picture->uniqueID() != picture_data.unique_id)
+    return false;
+
+  sk_sp<const SkData> serialized_picture = SerializePicture(picture);
+  return picture_data.data->equals(serialized_picture);
+}
+
+PictureData CreatePictureData(sk_sp<const SkPicture> picture) {
+  return PictureData(picture->uniqueID(), SerializePicture(picture));
+}
+
+TEST(PictureCacheConversionsTest, SerializePictureCaheUpdate) {
+  sk_sp<const SkPicture> picture1 = CreateSkPicture(SK_ColorRED);
+  sk_sp<const SkPicture> picture2 = CreateSkPicture(SK_ColorBLUE);
+  std::vector<PictureData> update;
+  update.push_back(CreatePictureData(picture1));
+  update.push_back(CreatePictureData(picture2));
+
+  proto::SkPictures proto_pictures;
+  PictureDataVectorToSkPicturesProto(update, &proto_pictures);
+  ASSERT_EQ(2, proto_pictures.pictures_size());
+
+  std::vector<PictureData> deserialized =
+      SkPicturesProtoToPictureDataVector(proto_pictures);
+
+  ASSERT_EQ(2U, deserialized.size());
+  PictureData picture_data_1 = deserialized.at(0);
+  PictureData picture_data_2 = deserialized.at(1);
+  EXPECT_TRUE(SamePicture(picture1, picture_data_1));
+  EXPECT_TRUE(SamePicture(picture2, picture_data_2));
+}
+
+}  // namespace
+}  // namespace cc