Computer graphics processing and selective visual display system – Computer graphics processing – Graph generating
Patent
1996-08-26
1999-05-18
Nguyen, Phu K.
Computer graphics processing and selective visual display system
Computer graphics processing
Graph generating
G06F15/00
Patent
active
059055065
ABSTRACT:
A system for providing a "copy on write" function for images represented as tiles such that creation of a new "target" version of an existing "source" image is performed by (1) allocating memory for a set of target image tiles corresponding to the tiles in the source image; and (2) using a special flag associated with each of the tiles of the target image to indicate a linkage (directly or indirectly) between corresponding tiles in the source image and the target image until such time as changes are made in the target image tiles or the target image is to be finalized. The invention eliminates or substantially reduces the amount of copying of data required to generate a new version of an existing image, and provides for an easy means for "undoing" an operation on the user-perceived image by swapping references to internal images, while conserving the use of memory and storage.
REFERENCES:
patent: 5442739 (1995-08-01), Saito
patent: 5522021 (1996-05-01), Huang et al.
Blatner, David et al., Real World Photoshop 3 Industrial Strength Production Techniques, pp. 453-455 (1996).
FITS Imaging et al., Live Picture, pp. 108-111 (1994).
Wolberg, George, Digital Image Warping, pp. 52-56, 214-219 (1990).
Meyers, Scott, More Effective C++, pp. 190-194 (1996).
Adobe Systems Incorporated
Nguyen Phu K.
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