It is extension program for SDL to display images other than bmp, but all the other formats.

sdl图像库 SDL（Simple DirectMedia Layer）是一个自由的跨平台的多媒体开发包，适用于 游戏、游戏SDK、演示软件、模拟器、MPEG播放器和其他应用软件。-sdl image library SDL (Simple DirectMedia Layer) is a free cross-platform multimedia development kit for games, game SDK, demo software, emulators, MPEG play