[BMP位图处理类]类中的位图都是兼容于当前显示器颜色格式的DDB位图

如果读入的位图格式与当前显示器的颜色格式不同，则读入函数会先将其转换

为兼容于当前显示器颜色格式的位图之后才放入类中

-[BMP bitmap class] category bitmap displays are compatible with the current color format if the DDB bitmap bitmap read format color display with the current format is different from the read function will first convert it to compatible display the current color format bitmap class after the Add