diff -r 000000000000 -r 6474c204b198 gfx/layers/ImageDataSerializer.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/layers/ImageDataSerializer.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,98 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=8 et :
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GFX_LAYERS_BLOBSURFACE_H
+#define GFX_LAYERS_BLOBSURFACE_H
+
+#include <stdint.h>                     // for uint8_t, uint32_t
+#include "mozilla/Attributes.h"         // for MOZ_STACK_CLASS
+#include "mozilla/RefPtr.h"             // for TemporaryRef
+#include "mozilla/gfx/Point.h"          // for IntSize
+#include "mozilla/gfx/Types.h"          // for SurfaceFormat
+
+class gfxImageSurface;
+
+namespace mozilla {
+namespace gfx {
+class DataSourceSurface;
+class DrawTarget;
+} // namespace gfx
+} // namespace mozilla
+
+namespace mozilla {
+namespace layers {
+
+class ImageDataSerializerBase
+{
+public:
+  bool IsValid() const { return mIsValid; }
+
+  uint8_t* GetData();
+  uint32_t GetStride() const;
+  gfx::IntSize GetSize() const;
+  gfx::SurfaceFormat GetFormat() const;
+  TemporaryRef<gfx::DataSourceSurface> GetAsSurface();
+  TemporaryRef<gfxImageSurface> GetAsThebesSurface();
+  TemporaryRef<gfx::DrawTarget> GetAsDrawTarget(gfx::BackendType aBackend);
+
+  static uint32_t ComputeMinBufferSize(gfx::IntSize aSize,
+                                       gfx::SurfaceFormat aFormat);
+
+protected:
+
+  ImageDataSerializerBase(uint8_t* aData, size_t aDataSize)
+    : mData(aData)
+    , mDataSize(aDataSize)
+    , mIsValid(false)
+  {}
+
+  void Validate();
+
+  uint8_t* mData;
+  size_t mDataSize;
+  bool mIsValid;
+};
+
+/**
+ * A facility to serialize an image into a buffer of memory.
+ * This is intended for use with the IPC code, in order to copy image data
+ * into shared memory.
+ * Note that there is a separate serializer class for YCbCr images
+ * (see YCbCrImageDataSerializer.h).
+ */
+class MOZ_STACK_CLASS ImageDataSerializer : public ImageDataSerializerBase
+{
+public:
+  ImageDataSerializer(uint8_t* aData, size_t aDataSize)
+    : ImageDataSerializerBase(aData, aDataSize)
+  {
+    // a serializer needs to be usable before correct buffer info has been written to it
+    mIsValid = !!mData;
+  }
+  void InitializeBufferInfo(gfx::IntSize aSize,
+                            gfx::SurfaceFormat aFormat);
+};
+
+/**
+ * A facility to deserialize image data that has been serialized by an
+ * ImageDataSerializer.
+ */
+class MOZ_STACK_CLASS ImageDataDeserializer : public ImageDataSerializerBase
+{
+public:
+  ImageDataDeserializer(uint8_t* aData, size_t aDataSize)
+    : ImageDataSerializerBase(aData, aDataSize)
+  {
+    Validate();
+  }
+
+};
+
+} // namespace layers
+} // namespace mozilla
+
+#endif