Method and apparatus for dynamically changing the color depth of

Details Method and apparatus for dynamically changing the color depth of Method and apparatus for dynamically changing the color depth of

1995-11-27

1998-06-30

Zimmerman, Mark K.

Computer graphics processing and selective visual display system

Computer graphics processing

Graph generating

G06T 1100

Patent

active

057741263

ABSTRACT:
In response to a change in the color depth of a computer system's display device, the invention dynamically changes the color depth of existing objects in system memory to match the changed color depth of the device. As a result open applications need not be shut down and then reopened to change the color depth of objects already in system memory. The dynamic changing is accomplished through a number of functions calls between an application, the operating system and a display driver. In one embodiment of the invention, copies with the changed color depth are made at one time of all objects in system memory and the original objects discarded. The copies are then transferred to screen memory (if the display device is a video display terminal) for display as they are requested. In another embodiment of the invention, copies with the changed color depth are made selectively as the objects are transferred to the screen memory. The copies are then discarded from system memory after transfer and the original objects retained.

REFERENCES:
patent: 4897799 (1990-01-01), Le Gall et al.
patent: 5388201 (1995-02-01), Hourvitz et al.
patent: 5420605 (1995-05-01), Vouri et al.
patent: 5469190 (1995-11-01), Masterson
patent: 5528261 (1996-06-01), Holt et al.
patent: 5566283 (1996-10-01), Modegi et al.

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