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CHAPTER 4
TrueType Fonts
74
TrueType Font Format
The LaserWriter Pro printer has built-in TrueType font-scaling software. This chapter
describes the behavior of the TrueType downloadable PostScript font format as it applies
to the LaserWriter Pro printer, which is described as a Type A Device. In defining
requirements for the LaserWriter Pro printer, this chapter also provides information on
other LaserWriter printers and PostScript devices that do not have the built-in TrueType
font scaler. These printers are referred to in this chapter as Type B and Type C devices.
Note
In this context, the term “device” is used to refer to a laser printer.
◆
The TrueType font format is efficient and produces high-quality print. Designed to
be as universally standardized as possible, it is nevertheless constrained by PostScript
implementations in older printers. To support current users, the TrueType implementa-
tion is designed to run efficiently on the large installed base of LaserWriter printers.
Future printers may be optimized to take advantage of any enhancements to TrueType,
and the format is designed to allow these enhancements to be incorporated easily and
dynamically.
The TrueType format places all PostScript devices in one of three classes:
■
Class A devices are those with a TrueType scaler embedded in the PostScript device.
The LaserWriter Pro printer is a Class A devices.
■
Class B devices are those with TrueType font-scaling code downloaded to the device
separately from the font itself.
■
Class C devices do not have TrueType available in any form, for example, third-party
PostScript compatible printers.
The downloadable TrueType font format can be used on any class device. However,
performance and quality characteristics may vary widely. Because their inherent
inability to use the TrueType enhancements, Class C devices show performance and
quality degradations. All third-party 68000-based Adobe PostScript printers are treated
as Class B devices, since they can handle downloaded assembly code.
TrueType Font Format 4
The TrueType PostScript format incorporates three components:
■
TrueType code
■
a small set of procedures, referred as the patch, which are used only during
TrueType processing
■
TrueType font for font definition
- Printers 1
- Contents 3
- LaserWriter Pro Software 4
- TrueType Fonts 5
- Figures and Tables 7
- About This Developer Note 9
- Other Reference Material 0 10
- For More Information 0 11
- Overview of 13
- LaserWriter Pro 13
- Hardware 1 13
- Communication 1 15
- Serial Communications 1 16
- CHAPTER 1 17
- SCSI Connector (630 Only) 1 20
- Internal SCSI Connector 1 22
- Mode Switch 1 24
- IMPORTANT 27
- Status Lights 1 28
- DRAM Expansion 1 29
- Software 2 31
- LaserWriter Pro Driver 2 32
- Printer Name 34
- CHAPTER 2 35
- Page Types 2 36
- LaserJet IIP Emulation 2 37
- Mode Selection Parameters 2 38
- Mode Selection Parameters 27 39
- LaserWriter Pro Software 3 41
- Device Setup 3 42
- Page Device Parameters 3 42
- CHAPTER 3 43
- Product Strings 3 46
- Install Procedure 3 46
- PhotoGrade Parameters 3 46
- FinePrint Parameters 3 48
- Interpreter Parameters 3 49
- System Parameters 3 50
- Interpreter Parameters 39 51
- Key Type Default Details 51
- Interpreter Parameters 52
- Device Parameters 3 53
- File System 3 53
- Key Type Details 54
- Interpreter Parameters 43 55
- Communication Channels 3 56
- Resource Categories 3 60
- Resource Categories 49 61
- Resource Categories 62
- Resource Categories 51 63
- Resource Categories 53 65
- Category name Instances 65
- Emulator Parameters 3 66
- Compatibility Operators 3 67
- Compatibility Operators 68
- Setting System Parameters 3 69
- Setting System Parameters 70
- Setting System Parameters 59 71
- Setting System Parameters 61 73
- Setting User Parameters 3 76
- Setting Device Parameters 3 77
- Setting Device Parameters 78
- Setting Device Parameters 67 79
- SCC Operator Encoding 3 81
- Level 2 Level 1 83
- TrueType Fonts 4 85
- TrueType Font Format 4 86
- TrueType Code 4 87
- TrueType Font Definition 4 88
- Device Operation 4 89
- Class B Devices 4 90
- Class C Devices 4 90
- Comments Description 92
- Key Type Semantics 93
- CHAPTER 4 94
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