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5.1.2 Font EncodingsAll fonts for text on a page must be used with a suitable encoding. The encoding defineshow the actual bytes in a string will be interpreted by PDFlib and Acrobat, and how theytranslate into text on a page. PDFlib supports a variety of encoding methods.All supported encodings can be arbitrarily mixed in one document. You may evenuse different encodings for a single font, although the need to do so will only rarelyarise.Note Not all encodings can be used with a given font. The user is responsible for making sure thatthe font contains all characters required by a particular encoding. This can even be problematicwith Acrobat’s core fonts (see Table 4.4).Identifying the glyphs in a font. There are three fundamentally different methods foridentifying individual glyphs (representations of a character) in a font:> PostScript Type 1 fonts are based on the concept of glyph names: each glyph is labelledwith a unique name which can be used to identify the character, and constructcode mappings which are suitable for a certain environment. While glyphnames have served their purpose for quite some time they impose severe restrictionson modern computing because of their space requirements and because theydo not really meet the requirements of international use (in particular CJK fonts).> TrueType and OpenType fonts identify individual glyphs based on their Unicodevalues. This makes it easy to add clear semantics to all glyphs in a text font. However,there are no standard Unicode assignments for pi or symbol fonts. This implies somedifficulties when using symbol fonts in a Unicode environment.> Chinese, Japanese, and Korean OpenType fonts are based on the concept of CharacterIDs (CIDs). These are basically numbers which refer to a standard repository (calledcharacter complement) for the respective language.There is considerable overlap among these concepts. For example, TrueType fonts maycontain an auxiliary table of PostScript glyph names for compatibility reasons. On theother hand, Unicode semantics for many standard PostScript glyph names are availablein the Adobe Glyph List (AGL). PDFlib supports all three methods (name-based, Unicode,CID).8-Bit encodings. 8-bit encodings are discussed in detail in Section 4.4, »8-Bit Encodings«,page 81. They can be pulled from various sources:> A large number of predefined encodings according to Table 4.4. These cover the mostimportant encodings currently in use on a variety of systems, and in a variety of locales.> User-defined encodings which can be supplied in an external file or constructed dynamicallyat runtime with PDF_encoding_set_char( ). These encodings can be based onglyph names or Unicode values.> Encodings pulled from the operating system, also known as system encoding. Thisfeature is only available on Windows, IBM eServer iSeries, and zSeries.> Abbreviated Unicode-based encodings which can be used to conveniently addressany Unicode range of 256 consecutive characters with 8-bit values.> Encodings specific to a particular font. These are also called font-specific or builtin encodings.96 Chapter 5: Font Handling
Wide-character addressing. In addition to 8-bit encodings, various other addressingschemes are supported which are much more powerful, and not subject to the 256 characterlimit.> Purely Unicode-based addressing via the unicode encoding keyword. In this case theclient directly supplies Unicode strings to PDFlib. The Unicode strings may be formattedaccording to one of several standard methods (such as UTF-16, UTF-8) andbyte orderings (little-endian or big-endian).> CMap-based addressing for a variety of Chinese, Japanese, and Korean standards.PDFlib supports all CMaps supported by Acrobat (see Section 5.6, »Chinese, Japanese,and Korean Fonts«, page 116).> Glyph id addressing for TrueType and OpenType fonts via the glyphid encoding keyword.This is useful for advanced text processing applications which need access toindividual glyphs in a font without reference to any particular encoding scheme, ormust address glyphs which do not have any Unicode mapping. The number of validglyph ids in a font can be queried with the maxcode keyword in PDF_info_font( ).> Direct CID addressing: this is mainly useful for creating CJK character collection tables.5.1 Overview of Fonts and Encodings 97
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PDFlib GmbH München, Germanywww.pd
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Contents0 Applying the PDFlib Licen
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5.6.1 Standard CJK Fonts 1165.6.2 C
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10.2.2 Block Properties 22710.2.3 W
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0 Applying the PDFlib License KeyAl
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Licensing options. Different licens
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PDFlib TET (Text Extraction Toolkit
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PDFlib can be integrated directly i
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Improved handling of Chinese, Japan
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1.4 Features in PDFlib/PDFlib+PDI/P
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1.5 Availability of Features in dif
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24 Chapter 1: Introduction
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2.2 COM Binding(This section is onl
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necessary. After fatal exceptions t
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2.4 C++ BindingIn addition to the p
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PDFlib servlets and Java applicatio
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2.6 .NET Binding(This section is on
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More than one way of String handlin
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PHP on Windows will find files with
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2.10 REALbasic Binding 1(This secti
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Now you can compile your program us
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2.13 Tcl BindingInstalling the PDFl
Page 46 and 47: Error policies. When PDFlib detects
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Page 52 and 53: 3.1.4 Generating PDF Documents in M
Page 54 and 55: 3.2 Page Descriptions3.2.1 Coordina
Page 56 and 57: In order to facilitate the use of t
Page 58 and 59: Merely constructing a path doesn’
Page 60 and 61: 3.3 Working with ColorNote The PDFl
Page 62 and 63: where is the identifier of the col
Page 64 and 65: Rendering Intents. Although PDFlib
Page 66 and 67: p.set_parameter("errorpolicy", "ret
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Page 72 and 73: Table 3.5 Parameters for the JavaSc
Page 74 and 75: 4.2 Important Unicode ConceptsChara
Page 76 and 77: 4.3 Strings in PDFlib4.3.1 String T
Page 78 and 79: EBCDIC UTF-8 BOM). If the usehypert
Page 80 and 81: values 0x7B and 0x7D must be preced
Page 82 and 83: Table 4.4 Availability of glyphs fo
Page 84 and 85: exclam 33 0x0021...If no Unicode va
Page 86 and 87: Table 4.5 Predefined CMaps for Japa
Page 88 and 89: 4.6 Addressing Characters and Glyph
Page 90 and 91: Table 4.8 Control characters and th
Page 92 and 93: glyphcheck=replace: silent approach
Page 94 and 95: 94 Chapter 4: Unicode and Legacy En
Page 98 and 99: 5.2 Font Format Details5.2.1 PostSc
Page 100 and 101: the contents of the characters in a
Page 102 and 103: Path resource category (again, the
Page 104 and 105: When working with host fonts it is
Page 106 and 107: Note The Leopard builds of PDFlib (
Page 108 and 109: put by default. For encodings which
Page 110 and 111: 5.4.2 Glyph ID Addressing for TrueT
Page 112 and 113: 5.5 Font Metrics and Text Variation
Page 114 and 115: Temporarily disabling kerning may b
Page 116 and 117: 5.6 Chinese, Japanese, and Korean F
Page 118 and 119: CJK host font names on Windows can
Page 120 and 121: 120 Chapter 5: Font Handling
Page 122 and 123: tion) if the user coordinate system
Page 124 and 125: color: black and white, grayscale,
Page 126 and 127: PDFlib supports three kinds of tran
Page 128 and 129: BMP> PNG> JPEG> TIFF> GIFFor images
Page 130 and 131: 6.2 Importing PDF Pages with PDI (P
Page 132 and 133: Alternatively, you can use the pdiu
Page 134 and 135: 20Kraxitext on top right of the box
Page 136 and 137: can be used. In Figure 7.5h the tex
Page 138 and 139: 7.1.5 Placing a StampCookbook A ful
Page 140 and 141: 7.2 Multi-Line TextflowsIn addition
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hortabmethod rulertabalignment left
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leftindent = &indentparindent = - &
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To fold the famous rocket looper pr
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Our paper planes are the ideal way
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Our paper planesare the ideal way o
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p.fit_textflow(textflow, left_x, le
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7.3 Placing Images and Imported PDF
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Fig. 7.28 Fitting an image into a b
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Fitting an oriented image into a bo
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7.4 Table FormattingThe table forma
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tbl = p.add_table_cell(tbl, 1, 1, "
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cell border as the Material text. T
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those width values will implicitly
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column defining a column width of 1
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The table in Figure 7.42 is spread
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Splitting a row. If the last body d
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To increase the box height to match
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Fig. 7.48 Using the image matchbox
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size of a page. Determining the pag
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8.3 Composite Data Structures and I
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Table 8.2 pCOS path prefixesprefixl
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Table 8.3 Universal pseudo objectso
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Table 8.4 Pseudo objects for PDF ob
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Table 8.5 Pseudo objects for resour
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194 Chapter 8: The pCOS Interface
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Table 9.2 PDFlib features for PDF 1
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to disable any access restrictions.
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Table 9.4 Access restriction keywor
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9.4 PDF/X for Print Production9.4.1
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Table 9.6 Operations which must be
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work as a full PDF/X validator or t
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9.5.2 Generating PDF/A-conforming O
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Table 9.11 Additional requirements
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This statement will retrieve a stri
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Table 9.16 Predefined XMP schemas f
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9.6 Tagged PDFTagged PDF is a certa
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quired, but will enhance the qualit
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* 1 create top part of left column
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optlist = "Title=Insert parent=" +
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exported to other formats. If the A
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Click Add... and select the PDFlib
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scaling factor or rotation. For eac
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10.3 Using the PDFlib Block Plugin
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next step other objects which are p
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Use Ctrl-V (on Windows) or Cmd-V (o
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Associating form fields with corres
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Property overrides can be achieved
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10.5 Standard Properties for Automa
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10.5.2 Text PropertiesText-related
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Table 10.6 Textflow block propertie
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Table 10.6 Textflow block propertie
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10.6 Querying Block Names and Prope
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10.7 PDFlib Block SpecificationThe
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Example. The following fragment sho
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254 Chapter 10: Variable Data and B
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256
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Ffeatures of PDFlib 20fill 57font m
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TrimBox 57TrueType fonts 95TTC (Tru
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