Computer graphics processing and selective visual display system – Display driving control circuitry – Controlling the condition of display elements
Patent
1993-10-28
1996-07-02
Tung, Kee Mei
Computer graphics processing and selective visual display system
Display driving control circuitry
Controlling the condition of display elements
395137, 395280, 345126, G06F 1500
Patent
active
055331858
ABSTRACT:
A pixel modification unit is provided for carrying out a variety of raster graphic manipulations in a RISC graphics processor. The pixel modification unit comprises a logic function unit, a masking unit, and a byte mirror unit. The logic function unit can perform any of 16 different logic operations between each bit of a source operand and a destination operand. The source operand may be a bit map fixed data, while the destination operand is pixel data in the bit map corresponding to the graphics image to be modified. The masking unit can mask any or all bits of a destination operand so that the logic function unit does not operate on the masked bits. When masking is implemented, the output of the pixel modification unit is derived from the masked bits from the destination operand and the unmasked bits which were operated on by the logic function unit. The byte mirror unit horizontally reflects a figure in the bit map via reversing the bit order of data bytes retrieved from the bit map. The present invention includes a high performance orthogonal rotator for a graphics processor that orthogonally rotates pixel regions in a bit map by an angle of 90.degree. or 270.degree.. Optionally, the pixel regions can be vertically mirrored as well as orthogonally rotated.
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Lentz Derek J.
Young Linley M.
Seiko Epson Corporation
Tung Kee Mei
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