Computer graphics processing and selective visual display system – Computer graphics display memory system – Plural storage devices
Reexamination Certificate
2005-02-18
2008-07-15
Tung, Kee M. (Department: 2628)
Computer graphics processing and selective visual display system
Computer graphics display memory system
Plural storage devices
C345S558000, C345S559000, C345S531000, C345S589000, C345S629000
Reexamination Certificate
active
07400328
ABSTRACT:
A graphics system reduces fetching from memory of color-key pixels when video pixels from a video-overlay window are displayed. A frame buffer is divided into multi-line, multi-pixel blocks that are arranged in block-rows and block-columns. Each block-row has primary and secondary row indicator bits and each block-column has two column indicator bits. When the primary row indicator bit is cleared, all pixels in the block-row are fetched from a frame-buffer memory. When the primary row indicator is set, a secondary row indicator bit selects either first or second column indicator bits for reading. When the selected column indicator bit for a block-column is set, fetching of pixels from the frame buffer memory is skipped. Instead, dummy color-key pixels are generated and inserted into the pixel stream. These dummy pixels match the color key and cause video pixels to be sent to the display. Memory fetching is reduced.
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Cheung Edmund
Yang Jimmy
Ye Bo
Auvinen Stuart T.
gPatent LLC
Lin David
NeoMagic Corp.
Tung Kee M.
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