Serialize SkPictures to the file system

sky/compositor/picture_serializer.cc

Index: sky/compositor/picture_serializer.cc
diff --git a/sky/compositor/picture_serializer.cc b/sky/compositor/picture_serializer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..47117e718af96d6eaf141668cec7e0954ad405d6
--- /dev/null
+++ b/sky/compositor/picture_serializer.cc
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+// Copyright 2015 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 "sky/compositor/picture_serializer.h"
+
+#include "third_party/skia/include/core/SkData.h"
+#include "third_party/skia/include/core/SkPixelSerializer.h"
+#include "third_party/skia/include/core/SkStream.h"
+#include "ui/gfx/codec/png_codec.h"
+
+namespace sky {
+
+class PngPixelSerializer : public SkPixelSerializer {
+ public:
+  bool onUseEncodedData(const void*, size_t) override { return true; }
+  SkData* onEncodePixels(const SkImageInfo& info, const void* pixels,
+      size_t row_bytes) override {
+    std::vector<unsigned char> data;
+
+    SkBitmap bm;
+    if (!bm.installPixels(info, const_cast<void*>(pixels), row_bytes))
+      return nullptr;
+    if (!gfx::PNGCodec::EncodeBGRASkBitmap(bm, false, &data))
+      return nullptr;
+    return SkData::NewWithCopy(&data.front(), data.size());
+  }
+};
+
+void SerializePicture(const char* file_name, SkPicture* picture) {
+  SkFILEWStream stream(file_name);
+  PngPixelSerializer serializer;
+  picture->serialize(&stream, &serializer);
+}
+
+}  // namespace sky