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diff --git a/gfx/2d/DataSurfaceHelpers.h b/gfx/2d/DataSurfaceHelpers.h
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+++ b/gfx/2d/DataSurfaceHelpers.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 _MOZILLA_GFX_DATASURFACEHELPERS_H
+#define _MOZILLA_GFX_DATASURFACEHELPERS_H
+
+#include "2D.h"
+
+#include "mozilla/UniquePtr.h"
+
+namespace mozilla {
+namespace gfx {
+
+int32_t StrideForFormatAndWidth(SurfaceFormat aFormat, int32_t aWidth);
+
+/**
+ * Create a DataSourceSurface and init the surface with the |aData|. The stride
+ * of this source surface might be different from the input data's
+ * |aDataStride|. System will try to use the optimal one.
+ */
+already_AddRefed<DataSourceSurface> CreateDataSourceSurfaceFromData(
+    const IntSize& aSize, SurfaceFormat aFormat, const uint8_t* aData,
+    int32_t aDataStride);
+
+/**
+ * Similar to CreateDataSourceSurfaceFromData(), but could setup the stride for
+ * this surface.
+ */
+already_AddRefed<DataSourceSurface> CreateDataSourceSurfaceWithStrideFromData(
+    const IntSize& aSize, SurfaceFormat aFormat, int32_t aStride,
+    const uint8_t* aData, int32_t aDataStride);
+
+/**
+ * Copy the pixel data from aSrc and pack it into aDst. aSrcSize, aSrcStride
+ * and aBytesPerPixel give the size, stride and bytes per pixel for aSrc's
+ * surface. Callers are responsible for making sure that aDst is big enough to
+ * contain |aSrcSize.width * aSrcSize.height * aBytesPerPixel| bytes.
+ */
+void CopySurfaceDataToPackedArray(uint8_t* aSrc, uint8_t* aDst,
+                                  IntSize aSrcSize, int32_t aSrcStride,
+                                  int32_t aBytesPerPixel);
+
+/**
+ * Convert aSurface to a packed buffer in BGRA format.
+ */
+UniquePtr<uint8_t[]> SurfaceToPackedBGRA(DataSourceSurface* aSurface);
+
+/**
+ * Convert aSurface to a packed buffer in BGR format. The pixel data is
+ * returned in a buffer allocated with new uint8_t[]. The caller then has
+ * ownership of the buffer and is responsible for delete[]'ing it.
+ *
+ * This function is currently only intended for use with surfaces of format
+ * SurfaceFormat::B8G8R8X8 since the X components of the pixel data (if any)
+ * are simply dropped (no attempt is made to un-pre-multiply alpha from the
+ * color components).
+ */
+uint8_t* SurfaceToPackedBGR(DataSourceSurface* aSurface);
+
+/**
+ * Clears all the bytes in a DataSourceSurface's data array to zero (so to
+ * transparent black for SurfaceFormat::B8G8R8A8, for example).
+ * Note that DataSourceSurfaces can be initialized to zero, which is
+ * more efficient than zeroing the surface after initialization.
+ */
+void ClearDataSourceSurface(DataSourceSurface* aSurface);
+
+/**
+ * Multiplies aStride and aHeight and makes sure the result is limited to
+ * something sane. To keep things consistent, this should always be used
+ * wherever we allocate a buffer based on surface stride and height.
+ *
+ * @param aExtra Optional argument to specify an additional number of trailing
+ *   bytes (useful for creating intermediate surfaces for filters, for
+ *   example).
+ *
+ * @return The result of the multiplication if it is acceptable, or else zero.
+ */
+size_t BufferSizeFromStrideAndHeight(int32_t aStride, int32_t aHeight,
+                                     int32_t aExtraBytes = 0);
+
+/**
+ * Multiplies aWidth, aHeight, aDepth and makes sure the result is limited to
+ * something sane. To keep things consistent, this should always be used
+ * wherever we allocate a buffer based on surface dimensions.
+ *
+ * @param aExtra Optional argument to specify an additional number of trailing
+ *   bytes (useful for creating intermediate surfaces for filters, for
+ *   example).
+ *
+ * @return The result of the multiplication if it is acceptable, or else zero.
+ */
+size_t BufferSizeFromDimensions(int32_t aWidth, int32_t aHeight, int32_t aDepth,
+                                int32_t aExtraBytes = 0);
+/**
+ * Copy aSrcRect from aSrc to aDest starting at aDestPoint.
+ * @returns false if the copy is not successful or the aSrc's size is empty.
+ */
+bool CopyRect(DataSourceSurface* aSrc, DataSourceSurface* aDest,
+              IntRect aSrcRect, IntPoint aDestPoint);
+
+/**
+ * Create a non aliasing copy of aSource. This creates a new DataSourceSurface
+ * using the factory and copies the bits.
+ *
+ * @return a dss allocated by Factory that contains a copy a aSource.
+ */
+already_AddRefed<DataSourceSurface> CreateDataSourceSurfaceByCloning(
+    DataSourceSurface* aSource);
+
+/**
+ * Return the byte at aPoint.
+ */
+uint8_t* DataAtOffset(DataSourceSurface* aSurface,
+                      const DataSourceSurface::MappedSurface* aMap,
+                      IntPoint aPoint);
+
+/**
+ * Check if aPoint is contained by the surface.
+ *
+ * @returns true if and only if aPoint is inside the surface.
+ */
+bool SurfaceContainsPoint(SourceSurface* aSurface, const IntPoint& aPoint);
+
+}  // namespace gfx
+}  // namespace mozilla
+
+#endif  // _MOZILLA_GFX_DATASURFACEHELPERS_H