摘要：
background :(From Wikipedia, the free encyclopedia)
BitBlit (which stands for Bit-Block (Image) Transfer but is pronounced Bit Blit) is a computer graphics operation in which several bitmaps are combined into one using a "raster operator".
The operation usually involves two bitmaps, a source and destination. The source and destination are combined bitwise according to the specified raster operation (ROP) and the result is then written to the destination. The ROP is essentially a boolean formul 阅读全文
