The Adobe Type 1 Font Format book (PDF: 445 KB) - Adobe Partners

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44 Adobe Type 1 Font Format 5.11 LanguageGroup Certain groups of written languages share broad aesthetic characteristics. Identification of such language groups can prove useful for accurate character rendering. The value of the entry LanguageGroup is an integer that indicates the language group of the font program. If the Private dictionary does not contain this entry, or if the given value is not recognized by Type 1 BuildChar, then the value of LanguageGroup defaults to zero. At this time, Type 1 BuildChar recognizes only two language groups, identified as group zero and group one. The future identification of other values for the LanguageGroup entry is reserved by Adobe Systems. Language group 0 consists of languages that use Latin, Greek, Cyrillic, and similar alphabets. Since the value of the LanguageGroup entry defaults to 0, a font program corresponding to one of these languages does not need to contain this entry. Language group 1 consists of Chinese ideographs and similar character sets, including Japanese Kanji and Korean Hangul. Font programs corresponding to one of these languages should contain the Private dictionary entry: /LanguageGroup 1 def For compatibility with older PostScript interpreters, creators of font programs specifying language group 1 must also include the RndStemUp entry in the Private dictionary: /RndStemUp false def The RndStemUp entry has been superseded by the LanguageGroup entry. No reference at all to the name RndStemUp should be made in any font program unless it belongs to language group one.
5.12 lenIV The lenIV entry is an integer specifying the number of random bytes at the beginning of charstrings for charstring encryption. The default value of lenIV is 4. To be compatible with version 23.0 of the PostScript interpreter (found in the original LaserWriter ® ), the value of lenIV should be set to 4. If compatibility with version 23.0 printers is not necessary, lenIV can be set to 0 or 1 to save storage. 5.13 Compatibility Entries The MinFeature and password entries must be included in the Private dictionary to allow Type 1 BuildChar to function properly. All Type 1 font programs should include the following assignments in the Private dictionary: /MinFeature {16 16} def /password 5839 def 5.14 ExpansionFactor The optional ExpansionFactor entry is a real number that gives a limit for changing the size of a character bounding box during the processing that adjusts the sizes of counters in fonts of LanguageGroup 1. The default value of ExpansionFactor is 0.06. At small point sizes or low resolutions, the system may have to accept irregular counters rather than violate this limit. Bar code fonts or logos that need counter control may benefit by setting LanguageGroup to 1 and increasing the ExpansionFactor limit to a larger amount such as 0.5 or more. For example: /ExpansionFactor 0.5 def Chapter 5: Private Dictionary 45
Page 1 and 2: Adobe Type 1 Font Format Adobe Syst
Page 3 and 4: Contents Chapter 1: Introduction ..
Page 5 and 6: Appendix 1: Private Dictionary Entr
Page 7 and 8: CHAPTER 1 Introduction This documen
Page 9 and 10: Type 1 font programs have several a
Page 11 and 12: Some Type 1 font rendering software
Page 13 and 14: CHAPTER 2 Font Program Organization
Page 15 and 16: 2.2 Font Dictionary Constructing a
Page 17 and 18: Example 1. %!FontType1-1.0: Symbol
Page 19 and 20: ment in the %%VMusage comment; the
Page 21 and 22: and range. The operand stack for ch
Page 23 and 24: Finally, the definefont operator ma
Page 25 and 26: 2. Uncertain distribution: If the f
Page 27 and 28: CHAPTER 3 Character Outline Conside
Page 29 and 30: n Figure 3b. Origin, width, left si
Page 31 and 32: Nearly all roman Type 1 font progra
Page 33 and 34: image and imagemask operators are n
Page 35 and 36: CHAPTER 4 Technical Design Consider
Page 37 and 38: Figure 4b. Make smooth transitions
Page 39 and 40: It is possible to carry consistency
Page 41 and 42: CHAPTER 5 Private Dictionary The Pr
Page 43 and 44: • All subsequent pairs describe t
Page 45 and 46: The value associated with FamilyBlu
Page 47 and 48: default value of BlueShift is 7. Th
Page 49: The entry StemSnapV is an array of
Page 53 and 54: CHAPTER 6 CharStrings Dictionary Th
Page 55 and 56: encoding values are listed. The com
Page 57 and 58: name of both components of an accen
Page 59 and 60: ather than as part of the main outl
Page 61 and 62: Subroutine Commands callothersubr a
Page 63 and 64: Figure 6a. Character level stem hin
Page 65 and 66: Encode the integers according to ch
Page 67 and 68: CHAPTER 7 Encryption Type 1 font pr
Page 69 and 70: To Decrypt a Sequence of Ciphertext
Page 71 and 72: Apply charstring encryption to prod
Page 73 and 74: CHAPTER 8 Using Subroutines A Type
Page 75 and 76: The pop commands following the subr
Page 77 and 78: Example 1. 40 575 hsbw Set left sid
Page 79 and 80: Figure 8b. Appropriate and inapprop
Page 81 and 82: To encode two Bézier curve segment
Page 83 and 84: Insert the coordinate of the refere
Page 85 and 86: CHAPTER 9 Special Font Organization
Page 87 and 88: ignores one of the groups by means
Page 89 and 90: CHAPTER 10 Adobe Type Manager Compa
Page 91 and 92: 10.3 Keywords Values for certain ke
Page 93 and 94: APPENDIX 1 Private Dictionary Entri
Page 95 and 96: APPENDIX 2 Charstring Command Value
Page 97 and 98: APPENDIX 3 OtherSubrs Programs The
Page 99 and 100: mtx currentmatrix pop mtx 0 get abs
Page 101 and 102:
ifelse} ifelse} ifelse {systemdict
Page 103:
APPENDIX 4 Changes This document de
Page 106 and 107:
100 Adobe Type 1 Font Format measur
Page 108 and 109:
102 Adobe Type 1 Font Format O oper
Page 110:
Colophon This book was produced usi
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