页面描述语言PostScript字库机制的一个层次式实现模型

A Hierarchical Implementation Model For PostScript Language's Font Mechanism

将国际流行的页面描述语言ＰｏｓｔＳｃｒｉｐｔ扩充以支持高质量的汉字页面的输出，是近年来国内外对ＰｏｓｔＳｃｒｉｐｔ语言及其解释器研究的一个热点．本文提出了一个ＰｏｓｔＳｃｒｉｐｔ字库机制的层次式实现模型。该层次模型从语言的描述能力到字库解释器的实现，充分体现了作者的两个目标：一是兼容和增强ＰｏｓｔＳｃｒｉＰｔ语言对页面上正文输出的灵活高效的描述能力，并推广到大字符集，多文种的应用场合；二是在解释器的字库技术上突破ＡｄｏｂｅＴｙｐｅ１的局限，使解释器能支持多种实用的字库技术，特别是国内的多种曲线轮廓汉字库技术．本文同时提出了将字库技术从页面描述语言中独立出来的研究与开发方法．

AbstractAlthough PostScript Language has been widely used in the area of electronic printing and publishing,it still need to be extended to have the facilities to deal with high quality Chinese characters on a printed page.In this paper,a hierarchical implementation model for PostScript's font mechanism is presented.This model has two main goals, one is to extend the language's description capability for Chinese characters compatiblly;the other is to use various kinds or font techniques especially techniques or Chinese outline characters instead of only Adobe Type 1 in the language's interpreter.This paper also describes a developement method,in which the font mechanism and the page description language (PDL) are developed separately.