[blimp] Add SkPicture caching support.

blimp/test/support/compositor/picture_cache_test_support.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 "blimp/test/support/compositor/picture_cache_test_support.h"
+
+#include "base/memory/ptr_util.h"
+#include "blimp/common/blob_cache/blob_cache.h"
+#include "blimp/common/blob_cache/id_util.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"
+#include "ui/gfx/geometry/point_f.h"
+#include "ui/gfx/geometry/rect.h"
+#include "ui/gfx/geometry/rect_f.h"
+#include "ui/gfx/skia_util.h"
+
+namespace blimp {
+
+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());
+}
+
+BlobId GetBlobId(sk_sp<const SkPicture> picture) {
+  sk_sp<SkData> data = SerializePicture(picture);
+  return CalculateBlobId(data->data(), data->size());
+}
+
+sk_sp<const SkPicture> DeserializePicture(sk_sp<SkData> data) {
+  SkMemoryStream stream(data);
+  return SkPicture::MakeFromStream(&stream, nullptr);
+}
+
+bool PicturesEqual(sk_sp<const SkPicture> picture,
+                   const cc::PictureData& picture_data) {
+  if (picture->uniqueID() != picture_data.unique_id) {
+    return false;
+  }
+  sk_sp<const SkPicture> deserialized_picture =
+      DeserializePicture(picture_data.data);
+  return GetBlobId(picture) == GetBlobId(deserialized_picture);
+}
+
+cc::PictureData CreatePictureData(sk_sp<const SkPicture> picture) {
+  return cc::PictureData(picture->uniqueID(), SerializePicture(picture));
+}
+
+}  // namespace blimp