ImageData (and Images loaded from them) now support different data formats. Resolves issue #1048.

Currently exposed formats are rgba8 and rgba16 (normalized), and rgba16f and rgba32f (floating-point). Some systems, especially mobile ones, won't support every format when creating a love.graphics Image. Use love.graphics.getRawImageFormats to check for support.

love.image.newImageData now takes an optional format parameter as its third argument when creating an empty sized ImageData. It defaults to rgba8.

16-bit PNGs, .hdr images, and floating-point OpenEXR images can now be loaded via love.image.newImageData and love.graphics.newImage.

--HG--
branch : minor

src/modules/image/magpie/EXRHandler.h

@@ -0,0 +1,56 @@
+/**
+ * Copyright (c) 2006-2016 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.
+ **/
+
+#ifndef LOVE_IMAGE_MAGPIE_EXR_HANDLER_H
+#define LOVE_IMAGE_MAGPIE_EXR_HANDLER_H
+
+#include "FormatHandler.h"
+
+namespace love
+{
+namespace image
+{
+namespace magpie
+{
+
+/**
+ * Interface between ImageData and TinyEXR library, for decoding exr files.
+ **/
+class EXRHandler : public FormatHandler
+{
+public:
+
+	// Implements FormatHandler.
+
+	virtual bool canDecode(love::filesystem::FileData *data);
+	virtual bool canEncode(ImageData::Format rawFormat, ImageData::EncodedFormat encodedFormat);
+
+	virtual DecodedImage decode(love::filesystem::FileData *data);
+	virtual EncodedImage encode(const DecodedImage &img, ImageData::EncodedFormat format);
+
+	virtual void free(unsigned char *mem);
+
+}; // EXRHandler
+
+} // magpie
+} // image
+} // love
+
+#endif // LOVE_IMAGE_MAGPIE_EXR_HANDLER_H