METHOD AND APPARATUS FOR REDUCING STORAGE REQUIREMENTS FOR DISPLAY DATA
    1.
    发明公开
    METHOD AND APPARATUS FOR REDUCING STORAGE REQUIREMENTS FOR DISPLAY DATA 失效
    VERFAHREN UND VORRICHTUNG ZUR VERMINDERUNG DES SPEICHERBEDARFSFÜRANZEIGEDATEN

    公开(公告)号:EP0834154A4

    公开(公告)日:1999-01-27

    申请号:EP96921460

    申请日:1996-06-07

    申请人: ADOBE SYSTEMS INC

    摘要: A method and apparatus for reducing storage requirements for display data on a computer system (12). Data objects (22) to be displayed are organized into display lists and each data object includes an object type, such as text, graphic, and image. The data objects (22) are rasterized into an uncompressed band buffer and divided into non-intersecting bitmap regions each identified with one or more object types. Each non-empty region is assigned a compression algorithm dependent upon the type of the region and specified compression constraints. The regions are combined with each other into larger regions if appropriate, and each region is compressed using its assigned compression algorithm into a compressed band buffer, thus reducing the required storage space for the data objects. The compressed data is decompressed in scan line order with a selected decompression algorithm corresponding to the assigned compression algorithms to produce uncompressed output data. The uncompressed output data is supplied to an output display device (16) for display.

    摘要翻译: 一种减少计算机系统上显示数据的存储要求的方法和装置。 要显示的数据对象被组织到显示列表中,并且每个数据对象包括对象类型,例如文本,图形和图像。 将数据对象光栅化为未压缩的带缓冲区,并将其划分为每个用一个或多个对象类型标识的非相交位图区域。 每个非空区域都被分配一个取决于区域的类型和指定的压缩约束的压缩算法。 如果合适,这些区域彼此组合成更大的区域,并且使用其分配的压缩算法将每个区域压缩成压缩带缓冲器,从而减少数据对象所需的存储空间。 按照扫描线顺序对压缩数据进行解压缩,并使用与分配的压缩算法相对应的选择的解压缩算法来产生未压缩的输出数据。 将未压缩的输出数据提供给输出显示装置进行显示。