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

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Library of Congress Cataloging-in-Publication Data Adobe type 1 font format / Adobe Systems Incorporated. p. cm Includes index ISBN 0-201-57044-0 1. PostScript (Computer program language) 2. Adobe Type 1 font (Computer program) I. Adobe Systems. QA76.73.P67A36 1990 686.2’2544536—dc20 90-42516 Copyright © 1990 Adobe Systems Incorporated. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of Adobe Systems Incorporated and Addison-Wesley, Inc. Printed in the United States of America. Published simultaneously in Canada. The information in this book is furnished for informational use only, is subject to change without notice, and should not be construed as a commitment by Adobe Systems Incorporated. Adobe Systems Incorporated assumes no responsibility or liability for any errors or inaccuracies that may appear in this book. The software described in this book is furnished under license and may only be used or copied in accordance with the terms of such license. Please remember that existing font software programs that you may desire to access as a result of information described in this book may be protected under copyright law. The unauthorized use or modification of any existing font software program could be a violation of the rights of the author. Please be sure you obtain any permission required from such authors. PostScript, the PostScript logo, Display PostScript, Adobe, and the Adobe logo are trademarks of Adobe Systems Incorporated registered in the U.S. Adobe Type Manager is a trademark of Adobe Systems Incorporated. IBM is a registered trademark of International Business Machines Corporation. Macintosh and LaserWriter are registered trademarks of Apple Computer, Inc. Helvetica and Optima are trademarks of Linotype AG and/or its subsidiaries. ITC Stone is a registered trademark of International Typeface Corporation. Other brand or product names are the trademarks or registered trademarks of their respective holders. 3456789-MU-96959493 Third printing, February 1993, Version 1.1
Contents Chapter 1: Introduction ................................................................. 1 1.1 What Is a Type 1 Font Program?.................................................... 2 1.2 What This Document Does............................................................ 3 1.3 Versions and Compatibility........................................................... 4 1.4 Copyrights for Type 1 Font Programs............................................ 5 Chapter 2: Font Program Organization.......................................... 7 2.1 Building Characters........................................................................ 7 2.2 Font Dictionary.............................................................................. 9 2.3 Explanation of a Typical Font Program....................................... 10 2.4 Inside the Encrypted Portion....................................................... 14 2.5 Unique Identification Numbers and Font Names ....................... 17 Chapter 3: Character Outline Considerations ............................... 21 3.1 Character Geography................................................................... 21 3.2 Alignments and Overshoots ........................................................ 23 3.3 Character Coordinate Space ........................................................ 25 3.4 Character Paths ............................................................................ 26 3.5 Direction of Paths ........................................................................ 27 3.6 Overlapping Paths........................................................................ 28 Chapter 4: Technical Design Considerations ................................. 29 4.1 Points at Extremes........................................................................ 29 4.2 Tangent Continuity ..................................................................... 30 4.3 Conciseness.................................................................................. 31 4.4 Consistency.................................................................................. 32 i
Page 1: Adobe Type 1 Font Format Adobe Syst
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
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Subroutine Commands callothersubr a
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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
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Apply charstring encryption to prod
Page 73 and 74:
CHAPTER 8 Using Subroutines A Type
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The pop commands following the subr
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Example 1. 40 575 hsbw Set left sid
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Figure 8b. Appropriate and inapprop
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To encode two Bézier curve segment
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Insert the coordinate of the refere
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CHAPTER 9 Special Font Organization
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ignores one of the groups by means
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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
Page 99 and 100:
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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