Images/[Compressed]ImageData can be created using any Data, instead of just files or FileData.

--HG--
branch : minor

src/modules/image/magpie/KTXHandler.h

@@ -40,9 +40,9 @@ public:
 	virtual ~KTXHandler() {}
 
 	// Implements CompressedFormatHandler.
-	bool canParse(const filesystem::FileData *data) override;
+	bool canParse(const Data *data) override;
 
-	StrongRef<CompressedMemory> parse(filesystem::FileData *filedata,
+	StrongRef<CompressedMemory> parse(Data *filedata,
 	        std::vector<StrongRef<CompressedSlice>> &images,
 	        PixelFormat &format, bool &sRGB) override;