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    • 5. 发明授权
    • Screen compression
    • 屏幕压缩
    • US07342590B1
    • 2008-03-11
    • US10435073
    • 2003-05-09
    • John M. DanskinZiyad S. HakuraEdward L. RiegelsbergerJason M. MusicerStephen D. Lew
    • John M. DanskinZiyad S. HakuraEdward L. RiegelsbergerJason M. MusicerStephen D. Lew
    • G06T9/00G06K9/36
    • G09G5/397G09G5/393G09G2340/02G09G2340/12G09G2360/122H04N19/428H04N19/593
    • Methods, circuits, and apparatus for reducing memory bandwidth used by a graphics processor. Uncompressed tiles are read from a display buffer portion of a graphics memory and received by an encoder. The uncompressed tiles are compressed and written back to the graphics memory. When a tile is needed again before it has been modified, the compressed version is read from memory, uncompressed, and displayed. To reduce the number of unnecessary writes of compressed tiles to memory, a tile is only written to memory if it has remained static for some number of refresh cycles. Also, to prevent a large number of compressed tiles being written to the display buffer in one refresh cycle, the encoder can be throttled after a number of tiles have been written. Validity information can be stored for use by a CRTC. If a tile is updated, the validity information is updated such that invalid compressed data is not read from memory and displayed.
    • 用于减少由图形处理器使用的存储器带宽的方法,电路和装置。 未压缩的瓦片从图形存储器的显示缓冲器部分读取并由编码器接收。 未压缩的瓦片被压缩并写回图形存储器。 在修改瓦片之前,再次需要一个瓦片时,从内存中读取压缩版本,解压缩并显示。 为了将压缩瓦片的不必要的写入数量减少到存储器,如果在一些刷新周期内保持静态,则瓦片仅写入存储器。 此外,为了防止在一个刷新周期中将大量的压缩瓦片写入显示缓冲器,编码器可以在写入多个瓦片之后被节流。 有效信息可以存储供CRTC使用。 如果更新瓦片,则更新有效性信息,使得无法从存储器读取无效的压缩数据并显示。