vrld avatar vrld committed 3e81bd2

Throw error if invalid canvas type was supplied in l.g.newCanvas()

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 	const char *str = luaL_optstring(L, 3, "normal");
 	Canvas::TextureType texture_type;
-	Canvas::getConstant(str, texture_type);
+	if (!Canvas::getConstant(str, texture_type))
+		return luaL_error(L, "Invalid canvas type: %s", str);
 	Canvas *canvas = NULL;
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