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

More documents

Recommendations

Info

66 Adobe Type 1 Font Format
CHAPTER 8 Using Subroutines A Type 1 font program uses two arrays of subroutines, Subrs and OtherSubrs. Uses for subroutines include: • Reducing the storage requirements of a font program by combining the program statements that describe common elements of the characters in the font. • Subrs 0 through 2 work with the Flex feature. • Subrs 3 works with hint replacement. • Subrs 4 and higher work with charstring calls. • OtherSubrs 0 through 2 implement the Flex feature. • OtherSubrs 3 implements hint replacement. The Subrs array contains sections of outlines encoded and encrypted as charstrings, and, when hint replacement is required, sequences of stem hint commands. When a font contains repeated elements, such as serifs, equal sized bowls, and so forth, they may be candidates for charstring subroutines. Note that the charstring command set includes only relative forms of path building commands. For example, rmoveto and rlineto are included, but moveto and lineto are not. Using relative motion commands facilitates the reuse of subroutines for sections of character outlines, regardless of their absolute placement within the character. An element of the Subrs array is a charstring, encoded and encrypted separately in the same way as charstrings in the CharStrings dictionary. A charstring subroutine must end with the return command. These subroutines are called with the 67
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 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: Apply charstring encryption to prod
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
show all

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

Create successful ePaper yourself

Delete template?

Save as template?