Pixel lookup in multiple variably-sized hardware virtual colorma

Details Pixel lookup in multiple variably-sized hardware virtual colorma Pixel lookup in multiple variably-sized hardware virtual colorma

1988-06-13

1991-06-18

Yusko, Donald J.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340723, 340729, 340734, 340522, 364522, G09G 100

Patent

active

050252496

ABSTRACT:
This invention adds a window dependent base value to the pixel values read from a frame buffer or other source of pixel values. The base value points to the base of the colormap for that window, which is allocated within a larger, physical colormap. Each window can access physical colormap entries starting at its base value and extending up to the base value plus the maximum pixel value used in that window. Adding a window dependent base value to the pixel values for each window allows different windows to use different colormaps, each of which can be allocated to any contiguous set of entries in the physical colormap. Each window's virtual colormap need only use as many entries in the physical colormap as there are entries in the virtual colormap. Finally, virtual colormaps can be compacted or otherwise reallocated in the physical colormap without requiring changes in the pixel values stored in the frame buffer. Only the colormap base values stored for each window need be changed.

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