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    • 2. 发明授权
    • Hardware implementation of clipping and intercoordinate comparison logic
    • 硬件实现削减和协调比较逻辑
    • US5297240A
    • 1994-03-22
    • US841883
    • 1992-02-25
    • Curtis PriemChris Malachowsky
    • Curtis PriemChris Malachowsky
    • G06T15/30G06F15/62
    • G06T15/30
    • An apparatus for implementing, in hardware, clipping and intercoordinate comparison logic in a graphic display subsystem. Clipping is necessary when an object to be displayed is defined as being only partially contained within a pre-determined window on a video display. For example, if a rectangular window is defined in the upper left hand corner of a video display, and a line has been defined which extends from the upper left-hand corner to the lower right-hand corner of the display, the portion of the line which is outside the defined window is not displayed, i.e., it is clipped. Additionally, if a line of text is wider than the window, the portion of the line of text which is outside the window must also be clipped. Calculations in the nature of comparisons are performed in hardware for use by a graphical subsystem for clipping images to be displayed on a video display in hardware whenever possible, leaving for software only those images, or portions of images which cannot be reliably clipped using the hardware of the graphical subsystem.
    • 一种用于在硬件中实现图形显示子系统中的削波和协调比较逻辑的装置。 当要显示的对象被定义为仅部分地包含在视频显示器上的预定窗口内时,剪切是必要的。 例如,如果在视频显示器的左上角定义了矩形窗口,并且已经定义了从显示器的左上角延伸到右下角的线, 在定义的窗口之外的行不被显示,即被剪切。 另外,如果一行文本比窗口宽,那么在窗口之外的文本行的部分也必须被剪切。 在硬件中执行比较性质的计算,以便由图形子系统用于在可能的情况下在硬件中剪切要显示在视频显示器上的图像,仅使软件仅使用那些图像,或者使用硬件不能可靠地裁剪的图像部分 的图形子系统。
    • 6. 发明授权
    • Method and apparatus for determining line positions for display and
manipulation by a computer system
    • 用于确定由计算机系统显示和操纵的行位置的方法和装置
    • US5128872A
    • 1992-07-07
    • US604993
    • 1990-10-25
    • Chris MalachowskyCurtis Priem
    • Chris MalachowskyCurtis Priem
    • G09G5/393
    • G09G5/393
    • A circuit for determining the X values of each end of a series of horizontal scan lines connecting a pair of line segments each of which is defined by a pair of vertices, the horizontal scan lines defining an area to be rendered on a computer output device, comprising first and second circuit portions, each of said circuit portions including apparatus to determine the slope of a line segment, apparatus depending on the slope for determining the beginning and ending X values for each line segment for each scan line in the area to be rendered, apparatus for causing the two circuit portions to begin operation at the same scan line, and apparatus for changing the Y value for each circuit portion to the Y value of the next adjacent scan line at the same time.
    • 一种用于确定连接一对线段的一系列水平扫描线的每端的X值的电路,每条线段由一对顶点限定,所述水平扫描线限定要在计算机输出设备上呈现的区域, 包括第一和第二电路部分,每个所述电路部分包括用于确定线段的斜率的装置,根据用于确定要呈现的区域中的每个扫描线的每个线段的开始和结束X值的斜率的装置 用于使两个电路部分在相同扫描线处开始工作的装置,以及用于将每个电路部分的Y值同时改变为下一个相邻扫描线的Y值的装置。