Hardware XOR sprite for computer display systems

Details Hardware XOR sprite for computer display systems Hardware XOR sprite for computer display systems

1993-12-30

1995-11-28

Jankus, Almis R.

395133, 395159, G06T 1100

Patent

active

054715709

ABSTRACT:
Method and apparatus for adjusting the color of the sprite in display systems, so that the sprite is always distinctively visible irrespective of the underlying displayed data. A palette DAC of a display system is provided with sprite control logic, which derives the color of a sprite to be overlaid on an image displayed on a video display unit of a display system by inverting only the most significant bit (MSB) of each of the red, green and blue pixel data components of the underlying image. In a preferred embodiment, the sprite control logic circuit comprises first, second and third multiplexors (MUXes) each having a first input connected to receive the MSB of the red, green and blue pixel data components of the underlying image, respectively, and a second input connected to receive the output of first, second and third XOR gates, respectively. Each of the first, second and third XOR gates similarly have a first input connected to receive the MSB of the red, green and blue pixel data components of the underlying image, respectively, and a second input connected to receive sprite data from a sprite RAM, which sprite data represents a sprite character to be overlaid on the displayed image.

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