Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1993-09-07
1997-04-29
Saras, Steven
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345136, 395135, G09G 500
Patent
active
056253745
ABSTRACT:
The present invention is a method for performing a parallel interpolation between corresponding pixel characteristics within a packed foreground pixel data word and a packed background pixel data word. A blending factor is used to indicate the extent to which the pixel characteristics are scaled, where the scaling is related to a power of two. The pixel characteristics within each packed data word are scaled simultaneously. The method of the present invention preferably comprises the steps of: creating shifted versions of the packed foreground pixel data word and the packed background pixel data word; inserting a guard bit into the most-significant bit (MSB) position of each pixel characteristic within the two shifted packed data words; adding the two shifted packed data words to create a packed result data word, where the packed result data word corresponds to a 50% blending; and adding a packed adjustment data word formed from either the packed foreground or background data word to the packed result data word based upon the exact value of the blending factor. Upon completion of the method, the packed result data word is interpreted as a packed composite pixel data word.
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Apple Computer Inc.
Saras Steven
Sueoka, Esq. Greg T.
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