Move decoder-agnostic love.image code out of the magpie backend folder.

--HG--
branch : minor

src/modules/image/FormatHandler.cpp

@@ -0,0 +1,64 @@
+/**
+ * Copyright (c) 2006-2017 LOVE Development Team
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty.  In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ *    claim that you wrote the original software. If you use this software
+ *    in a product, an acknowledgment in the product documentation would be
+ *    appreciated but is not required.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ *    misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ **/
+
+// LOVE
+#include "FormatHandler.h"
+#include "common/Exception.h"
+
+namespace love
+{
+namespace image
+{
+
+FormatHandler::FormatHandler()
+{
+}
+
+FormatHandler::~FormatHandler()
+{
+}
+
+bool FormatHandler::canDecode(love::filesystem::FileData* /*data*/)
+{
+	return false;
+}
+
+bool FormatHandler::canEncode(PixelFormat /*rawFormat*/, EncodedFormat /*encodedFormat*/)
+{
+	return false;
+}
+
+FormatHandler::DecodedImage FormatHandler::decode(love::filesystem::FileData* /*data*/)
+{
+	throw love::Exception("Image decoding is not implemented for this format backend.");
+}
+
+FormatHandler::EncodedImage FormatHandler::encode(const DecodedImage& /*img*/, EncodedFormat /*format*/)
+{
+	throw love::Exception("Image encoding is not implemented for this format backend.");
+}
+
+void FormatHandler::free(unsigned char *mem)
+{
+	delete[] mem;
+}
+
+} // image
+} // love