图像的剪切与合成，剪切：使用CRgn类创建一个剪切区域，利用CDC选中该剪切区域，在该区域绘制图像，将剪切的区域设置为白色背景；合成：采用CDC类的BitBlt方法实现,Shear and synthetic images, shear: the use of categories to create a shear CRgn region, the use of CDC select the shear area, mapping the image in the region, the re

VC++6.0写的RGN编程，可用于显示歌词字幕等，使用CRgn类。-VC++ 6.0 written RGN programming, can be used to display lyrics, such as subtitles, use CRgn category.

使用CRgn类实现区域操作的实例源码,很不错的demo-Used for regional operations CRgn class source code examples, very good demo