Additional entries speci c to a PostScript XObject dictionary in Java

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TABLE 444 Additional entries speci c to a PostScript XObject dictionary
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KEY TYPE VALUE
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Type Subtype Level1
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name name stream
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(Optional) The type of PDF object that this dictionary describes; if present, must be XObject for a PostScript XObject (Required) The type of XObject that this dictionary describes; must be PS for a PostScript XObject (Optional) A stream whose contents are to be used in place of the PostScript XObject s stream when the target PostScript interpreter is known to support only LanguageLevel 1
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When a PDF content stream is translated into the PostScript language, any Do operation that references a PostScript XObject is replaced by the contents of the XObject stream itself The stream is copied without interpretation The PostScript fragment may use Type 1 and TrueType fonts listed in the Font subdictionary of the current resource dictionary (see Section 372, Resource Dictionaries ), accessing them by their BaseFont names using the PostScript ndfont operator The fragment may not use other types of font listed in the Font subdictionary It should not reference the PostScript de nitions corresponding to PDF procedure sets (see Section 91, Procedure Sets ), which are subject to change
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Text
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THIS CHAPTER DESCRIBES the special facilities in PDF for dealing with text speci cally, for representing characters with glyphs from fonts A glyph is a graphical shape and is subject to all graphical manipulations, such as coordinate transformation Because of the importance of text in most page descriptions, PDF provides higher-level facilities that permit an application to describe, select, and render glyphs conveniently and ef ciently The rst section is a general description of how glyphs from fonts are painted on the page Subsequent sections cover the following topics in detail:
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Text state A subset of the graphics state parameters pertain to text, including
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parameters that select the font, scale the glyphs to an appropriate size, and accomplish other graphical effects
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Text objects and operators The text operators specify the glyphs to be painted,
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represented by string objects whose values are interpreted as sequences of character codes A text object encloses a sequence of text operators and associated parameters
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Font data structures Font dictionaries and associated data structures provide
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information that a viewer application needs to interpret the text and position the glyphs properly The de nitions of the glyphs themselves are contained in font programs, which may be embedded in the PDF le, built into the viewer application, or obtained from an external font le
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CHA P TE R 5
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Text
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51 Organization and Use of Fonts
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A character is an abstract symbol, whereas a glyph is a speci c graphical rendering of a character For example, the glyphs A, A, and A are renderings of the abstract A character Historically these two terms have often been used interchangeably in computer typography (as evidenced by the names chosen for some PDF dictionary keys and PostScript operators), but advances in this area have made the distinction more meaningful in recent times Consequently, this book distinguishes between characters and glyphs, though with some residual names that are inconsistent Glyphs are organized into fonts A font de nes glyphs for a particular character set; for example, the Helvetica and Times fonts de ne glyphs for a set of standard Latin characters A font for use with a PDF viewer application is prepared in the form of a program Such a font program is written in a special-purpose language, such as the Type 1 or TrueType font format, that is understood by a specialized font interpreter In PDF, the term font refers to a font dictionary, a PDF object that identi es the font program and contains additional information about it There are several different font types, identi ed by the Subtype entry of the font dictionary For most font types, the font program itself is de ned in a separate font le, which may be either embedded in a PDF stream object or obtained from an external source The font program contains glyph descriptions that generate glyphs A content stream paints glyphs on the page by specifying a font dictionary and a string object that is interpreted as a sequence of one or more character codes identifying glyphs in the font This operation is called showing the text string The glyph description consists of a sequence of graphics operators that produce the speci c shape for that character in this font To render a glyph, the viewer application executes the glyph description Programmers who have experience with scan conversion of general shapes may be concerned about the amount of computation that this description seems to imply However, this is only the abstract behavior of glyph descriptions and font programs, not how they are implemented In fact, an ef cient implementation can be achieved through careful caching and reuse of previously rendered glyphs
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