Xerox 6180N Using LCDS Print Description Language - Page 433

Using PDL commands for graphics • Use of block and record constants in an appropriately structured file (type F, FB, V, or VB) containing interleaved graphics is supported. However, the actual delimiter searching is suspended while an .IMG file is being read. - For record delimiters, this means that delimiter searching is suspended from the first record of graphic data until the entire graphic has been read. Extraneous bytes at the end of the last record are ignored. Record delimiter processing resumes with the next record. - For block delimiters, this means that the first byte of a graphic must be the first data byte of a block and that the first byte of data following the graphic must also be the first byte of a block. Extraneous data in the last block following the last byte specified by the IMG byte count is ignored. • Improved tape to disk processing time is obtained if the graphic data portion of each record is an integer multiple of 512 bytes and begins at an even byte offset from the beginning of the block. Processing of each graphic begins in this mode. If a record is not a multiple of 512 bytes or does not begin at an even byte offset from the beginning of the block, the mode is terminated. Page Interleaved format In this format, one or more graphics imaged on a physical page are included in the data file immediately following the textual data for that page. These graphics, if referenced, are processed in Block mode. If not referenced, a page interleaved graphic is skipped. The rules for page interleaved graphics are as follows: • The graphics must occur immediately following the last text to appear on the physical page. • The four rules for document interleaved graphics apply to this format also. Refer to the "Document Interleaved format" section earlier in this chapter. Batch Mode format In this format, a report contains only graphics that will be imaged one per page and an optional IMAGE DJDE preceding each graphic. These graphics are processed as Block mode graphics. The four rules for document interleaved graphics apply to this format also. Refer to the "Document Interleaved format" section earlier in this chapter. NOTE: Block or record delimiters are not permitted. Using LCDS Print Description Language 6-5