1 files changed, 39 insertions, 0 deletions
diff --git a/gfx/2d/DataSourceSurfaceWrapper.h b/gfx/2d/DataSourceSurfaceWrapper.h
new file mode 100644
index 000000000..d1112b57c
--- /dev/null
+++ b/gfx/2d/DataSourceSurfaceWrapper.h
@@ -0,0 +1,39 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * 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_DATASOURCESURFACEWRAPPER_H_
+#define MOZILLA_GFX_DATASOURCESURFACEWRAPPER_H_
+
+#include "2D.h"
+
+namespace mozilla {
+namespace gfx {
+
+// Wraps a DataSourceSurface and forwards all methods except for GetType(),
+// from which it always returns SurfaceType::DATA.
+class DataSourceSurfaceWrapper : public DataSourceSurface
+{
+public:
+  MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(DataSourceSurfaceWrapper, override)
+  explicit DataSourceSurfaceWrapper(DataSourceSurface *aSurface)
+   : mSurface(aSurface)
+  {}
+
+  virtual SurfaceType GetType() const override { return SurfaceType::DATA; }
+
+  virtual uint8_t *GetData() override { return mSurface->GetData(); }
+  virtual int32_t Stride() override { return mSurface->Stride(); }
+  virtual IntSize GetSize() const override { return mSurface->GetSize(); }
+  virtual SurfaceFormat GetFormat() const override { return mSurface->GetFormat(); }
+  virtual bool IsValid() const override { return mSurface->IsValid(); }
+
+private:
+  RefPtr<DataSourceSurface> mSurface;
+};
+
+} // namespace gfx
+} // namespace mozilla
+
+#endif /* MOZILLA_GFX_DATASOURCESURFACEWRAPPER_H_ */