System and method for immediate per window graphics clipping

Details System and method for immediate per window graphics clipping System and method for immediate per window graphics clipping

1995-07-28

1996-09-03

Jankus, Almis R.

395133, 395157, G06T 1530

Patent

active

055532101

ABSTRACT:
A system and method for performing efficient clipping to visible windows. A window clip buffer is established for each window being written directly to the front frame buffer. The window clip buffer is initialized as having the same dimensions as the window itself and each pixel position is initially set to False (not visible.) The visible regions are determined and the buffer updated to True (visible) for those visible regions. As each pixel is being drawn the window clip buffer is tested. The pixel is drawn to the frame buffer only where the window clip buffer pixel is true (visible.) Changes to window positions on the screen causes the visible regions to be updated.

REFERENCES:
patent: 5231695 (1993-07-01), Harrington

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