| 摘要 |
Output from an application or other program running in a windowing environment is redirected from the application to a bit map where it can be further manipulated prior to being displayed on the screen. A style bit is associated with each window from applications which are to be so redirected. Further parameters are associated with display of the window to provide position and size information and to provide special effects. Some special effects, such as transparency are identified by an alpha value, which enables further programs to manipulate the window in its associated bit map to make it appear transparent. One or more application program interfaces (APIs) provide the ability to specify the transparency, positioning, color key, size and other attributes as well as whether or not the window is redirected. This API may be utilized by the application to apply special effects to its windows., It may be used via a user interface to allow the user to select a desired window to redirect. It may be used by another application to create new UI by applying geometrical transforms to the visual bits in the redirection bitmap provided by the system.
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