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

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6 Adobe Type 1 Font Format Adobe Systems’ Type 1 font programs are licensed for use on one or more devices (depending on the terms of particular licenses). These licenses would permit the use of a licensed program in a system that translates a Type 1 font program to some other format in the process of rendering, as long as a copy of the program (even in translated form) is not produced. The personal computer software industry has benefitted greatly from copyright protection. Competition is keen, and users benefit from the efforts software developers have found to be worthwhile. Copyright protection gives the developer of a Type 1 font program the incentive to create excellent typeface programs. In turn, the user of Type 1 font programs can expect to have available the finest typeface software to choose from.
CHAPTER 2 Font Program Organization A font program written in the PostScript language is a program that is an organized collection of procedures describing character shapes. Elements of this collection are accessed by character code with the show operator, as described in the PostScript Language Reference Manual. Different font programs contain different amounts of diverse information, this information is collected into a dictionary. The dictionary contains required and optional entries, and is the data object that the PostScript interpreter references for all font operations. 2.1 Building Characters Every Type 3 (user-defined) font program requires a font dictionary entry named BuildChar, as described in the PostScript Language Reference Manual. The value associated with this name is a procedure that the PostScript interpreter calls whenever it needs to have a character built. The Type 3 BuildChar procedure is free to use whatever method it chooses to supply the PostScript interpreter with graphics commands to paint the character associated with a character code. Generally, BuildChar procedures operate by selecting a particular procedure for building a character from an array or from a dictionary of such procedures stored in the font dictionary. In contrast, Type 1 font programs implicitly reference a special BuildChar procedure called Type 1 BuildChar that is internal to the PostScript interpreter. Consequently, there is no explicit entry named BuildChar in a Type 1 font dictionary; the fact that it is a Type 1 font program implies that it uses Type 1 BuildChar. In essence, the description of the Type 1 font format is the explanation of the functions of Type 1 BuildChar. 7
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: Some Type 1 font rendering software
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 and 50: The entry StemSnapV is an array of
Page 51 and 52: 5.12 lenIV The lenIV entry is an in
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
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10.3 Keywords Values for certain ke
Page 93 and 94:
APPENDIX 1 Private Dictionary Entri
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APPENDIX 2 Charstring Command Value
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APPENDIX 3 OtherSubrs Programs The
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mtx currentmatrix pop mtx 0 get abs
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ifelse} ifelse} ifelse {systemdict
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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
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Colophon This book was produced usi
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