Video graphics controller with selectable pattern features for line draws
    3.
    发明授权
    Video graphics controller with selectable pattern features for line draws 失效
    视频图形控制器,具有可选图案功能,用于线条绘制

    公开(公告)号:US5416897A

    公开(公告)日:1995-05-16

    申请号:US117485

    申请日:1993-09-07

    IPC分类号: G09G5/20 G06T11/20

    CPC分类号: G06T11/203

    摘要: Circuitry for drawing lines includes a video memory for storing pixel data and circuitry for generating a sequence of addresses defining a line of pixels in the video memory. A first memory stores a sequence of pattern units corresponding to the generated sequence of addresses. A second memory stores a value indicating a current pattern unit. Writing circuitry writes to the video memory at a generated address responsive to a current pattern unit. A third memory stores a control value which is accessed by update circuitry for updating the second memory to indicate the next pattern unit. The update circuitry may selectively update the second memory to the sequential pattern unit or reset the second memory to a predetermined pattern unit.

    摘要翻译: 用于绘制线的电路包括用于存储像素数据的视频存储器和用于产生定义视频存储器中的像素线的地址序列的电路。 第一存储器存储对应于所生成的地址序列的模式单元序列。 第二存储器存储指示当前图案单元的值。 写入电路响应于当前模式单元以产生的地址写入视频存储器。 第三存储器存储由更新电路访问的控制值,用于更新第二存储器以指示下一个模式单元。 更新电路可以选择性地将第二存储器更新为顺序模式单元或将第二存储器复位到预定模式单元。