一种高效的位图显示方式

An Efficient Method to Display Bitmap

对于小的位图显示,并没有什么太多的技术问题.而对于大的(几百兆甚至上千兆)的位图显示,为了提高显示速度,在显示之前就必须要进行必要的处理.本文为了提高大位图的显示速度,采用了浏览位图哪里就把哪里的图像放入内存,当有缩小图像时,浏览到的图像范围就很大,就采用在显示之前把要显示的部分进行压缩好,放大时显示范围会很小,就把要显示的图像扩充好再显示.总之,在图像显示之前要进行预处理,这是本文的难点与创新之处.

As for displaying a small bitmap, there is no technical problem. But as for displaying a big bitmap（ several hundred or thousand megabytes ）, it is necessary to do some pre-process in ordre to improve the displaying speed. In this paper, a new method , which does some pre-process before displaying, is introduced to improve the displaying speed of big bitmaps.