Add Data:getFFIPointer. Similar to Data:getPointer but returns a cdata pointer directly (or nil if the FFI isn't available).

It should be preferred instead of Data:getPointer because the latter uses lightuserdata which can't store more all possible memory addresses on some new arm64 architectures, when LuaJIT is used.

src/modules/image/wrap_CompressedImageData.cpp

@@ -116,7 +116,9 @@ static const luaL_Reg w_CompressedImageData_functions[] =
 
 extern "C" int luaopen_compressedimagedata(lua_State *L)
 {
-	return luax_register_type(L, &CompressedImageData::type, data::w_Data_functions, w_CompressedImageData_functions, nullptr);
+	int ret = luax_register_type(L, &CompressedImageData::type, data::w_Data_functions, w_CompressedImageData_functions, nullptr);
+	love::data::luax_rundatawrapper(L, CompressedImageData::type);
+	return ret;
 }
 
 } // image

src/modules/image/wrap_ImageData.cpp

@@ -510,20 +510,8 @@ extern "C" int luaopen_imagedata(lua_State *L)
 
 	int ret = luax_register_type(L, &ImageData::type, data::w_Data_functions, w_ImageData_functions, nullptr);
 
-	luax_gettypemetatable(L, ImageData::type);
-
-	// Load and execute ImageData.lua, sending the metatable and the ffi
-	// functions struct pointer as arguments.
-	if (lua_istable(L, -1))
-	{
-		luaL_loadbuffer(L, imagedata_lua, sizeof(imagedata_lua), "ImageData.lua");
-		lua_pushvalue(L, -2);
-		lua_pushlightuserdata(L, &ffifuncs);
-		lua_call(L, 2, 0);
-	}
-
-	// Pop the metatable.
-	lua_pop(L, 1);
+	love::data::luax_rundatawrapper(L, ImageData::type);
+	luax_runwrapper(L, imagedata_lua, sizeof(imagedata_lua), "ImageData.lua", ImageData::type, &ffifuncs);
 
 	return ret;
 }

src/modules/image/wrap_ImageData.lua

@@ -22,7 +22,7 @@ misrepresented as being the original software.
 3. This notice may not be removed or altered from any source distribution.
 --]]
 
-local ImageData_mt, ffifuncspointer = ...
+local ImageData_mt, ffifuncspointer_str = ...
 local ImageData = ImageData_mt.__index
 
 local tonumber, assert, error = tonumber, assert, error
@@ -103,7 +103,7 @@ struct ImageData_Pixel_RG32F { float r, g; };
 struct ImageData_Pixel_RGBA32F { float r, g, b, a; };
 ]])
 
-local ffifuncs = ffi.cast("FFI_ImageData *", ffifuncspointer)
+local ffifuncs = ffi.cast("FFI_ImageData **", ffifuncspointer_str)[0]
 
 local conversions = {
 	r8 = {