Added support for DXT1/3/5 and BC5/7 compressed textures via love.image.CompressedData. Some internals are still iffy.

- added a new CompressedData type to love.image
- added love.image.isCompressed(file or data)
- love.graphics.newImage automatically tests for compression when loading a file
- added love.graphics.isSupported strings for DXT, BC5, and BC7

Compressed textures meant to be used on the GPU offer huge performance gains when
- loading the texture from a file
- loading the texture from RAM to VRAM
- loading mipmaps
- rendering

--HG--
branch : image-CompressedData

src/modules/image/wrap_CompressedData.h

@@ -0,0 +1,44 @@
+/**
+ * Copyright (c) 2006-2013 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_WRAP_COMRESSED_DATA_H
+#define LOVE_IMAGE_WRAP_COMRESSED_DATA_H
+
+// LOVE
+#include "common/runtime.h"
+#include "CompressedData.h"
+
+namespace love
+{
+namespace image
+{
+
+CompressedData *luax_checkcompresseddata(lua_State *L, int idx);
+int w_CompressedData_getWidth(lua_State *L);
+int w_CompressedData_getHeight(lua_State *L);
+int w_CompressedData_getDimensions(lua_State *L);
+int w_CompressedData_getNumMipmaps(lua_State *L);
+int w_CompressedData_getType(lua_State *L);
+extern "C" int luaopen_compresseddata(lua_State *L);
+
+} // image
+} // love
+
+#endif // LOVE_IMAGE_WRAP_COMRESSED_DATA_H