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1. 发明授权

US5870535A Method and apparatus for building rasterized lines of bitmap data to be printed using a piecewise-linear direct memory access addressing mode of retrieving bitmap data line segments 失效
标题翻译：用于使用分段线性直接存储器访问寻址模式来构建要打印的位图数据的光栅化行的方法和装置，用于检索位图数据线段
公开(公告)号：US5870535A
公开(公告)日：1999-02-09
申请号：US854607
申请日：1997-05-12
申请人： Darrin Lee Duffin , James Howard Ellis, Jr. , Phillip Daniel Erwin, Jr. , Cuong Manh Hoang
发明人： Darrin Lee Duffin , James Howard Ellis, Jr. , Phillip Daniel Erwin, Jr. , Cuong Manh Hoang
IPC分类号： B41J5/30 , G06K15/02 , H04N1/21 , G06H15/00
CPC分类号： G06K15/02 , G06K2215/0065 , G06K2215/0077 , G06K2215/008
摘要： An improved printer is provided that receives a print job from a host computer and divides the bitmap image of a page to be printed into a series of image blocks or tiles. Each image block containing non-null data will be stored in the printer's memory system, typically placed in a non-contiguous memory location with respect to other blocks. The null image data blocks will not be stored in the printer's memory system, but instead only their locations on the physical printed page will be stored in a "block list table." Each entry in the block list table contains the beginning address of the physical RAM area that contains one of the image data blocks, and also contains other variables or attributes concerning the particular image data block, such as whether or not this block is a regular non-null data block, or a "no-op" (or "NOP") block containing null data. Null data blocks require no physical memory address to be listed in their entry on the block list table, since no physical RAM areas are needed for storing null bitmap image data. Rather than building a band buffer in contiguous memory before shipping rasterized data to the laser printhead, the present invention builds in a cache a series of rasterized line segments of bitmap data in real time and sends them to the laser printhead "on the fly," by retrieving a single rasterized line segment of data, block-by-block, as needed to complete a single entire line.
摘要翻译：提供了一种改进的打印机，其从主计算机接收打印作业并将要打印的页面的位图图像划分成一系列图像块或瓦片。包含非空数据的每个图像块将被存储在打印机的存储器系统中，通常相对于其它块放置在非连续的存储器位置。空图像数据块将不会存储在打印机的存储系统中，而只是它们在物理打印页面上的位置将被存储在“块列表”中。块列表表中的每个条目包含包含图像数据块之一的物理RAM区域的起始地址，并且还包含与特定图像数据块有关的其他变量或属性，例如该块是否为常规非 -null数据块或包含空数据的“no-op”（或“NOP”）块。空数据块不需要将物理内存地址列在块列表表的条目中，因为不需要物理RAM区域来存储空位图图像数据。在将光栅化数据发送到激光打印头之前，不是在连续存储器内构建带缓冲器，而是本身在高速缓存中实时地构建位图数据的一系列光栅化线段，并将它们“即时地”发送到激光打印头。通过根据需要逐块检索单个光栅化的数据线段，以完成单个整行。

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