| 摘要 |
A method and apparatus for defining and displaying an irregular bitmap on a display device context using a rectangular source bitmap creates a working bitmap from a source bitmap for the window it will be displayed on. A black and white mask of the source bitmap is created and then an inverse black and white mask of the source bitmap is created. A bitmap is created with a background color the same as the background color of the window and the irregular bitmap in black, and a bitmap is created with a black background and the irregular bitmap in its original color. A rectangular bitmap is then created with its background color set to the window background color and the irregular bitmap in its original color, and the bitmap is displayed on the window. Lastly, the unneeded bitmaps and device contexts are deleted and the display device context is released.
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