Desktop compositor using copy-on-write semantics

Details Desktop compositor using copy-on-write semantics Desktop compositor using copy-on-write semantics

2005-06-28

2005-06-28

Chauhan, Ulka J. (Department: 2676)

Computer graphics processing and selective visual display system

Computer graphics display memory system

Plural storage devices

C345S503000, C345S520000, C345S531000, C345S545000, C345S539000

Reexamination Certificate

active

06911984

ABSTRACT:
Tile data for drawing and desktop buffers in a desktop compositor system is managed using “copy-on-write” semantics, in which tile data stored in a memory location is not transferred to another location until the tile data for one of the buffers is modified. For each tile in drawing buffers and desktop buffers, an association is maintained with a location in a tile memory, and the number of buffer tiles associated with each location is tracked. To copy a tile from one buffer to another, the tile association for the tile in the destination buffer is modified. New data for a tile of a buffer is written to the tile memory location associated with the buffer after ensuring that the tile memory location is not associated with any other tiles of any of the buffers. As a result, memory bandwidth can be considerably reduced.

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