TweetFollow Us on Twitter

September 96 - Print Hints: The All-New LaserWriter Driver Version 8.4

Print Hints: The All-New LaserWriter Driver Version 8.4

Dave Polaschek

By the time you read this, version 8.4 of the LaserWriter 8 printer driver will have shipped. This driver -- LaserWriter version 8.4, for short -- is not the same old LaserWriter driver: it has new features that developers have been asking for, sports a new user interface, and beats earlier versions of the driver in the quarter mile.

Here I'll outline some of the changes -- a few minor, a few major -- that you need to be aware of for compatibility reasons. Even if you don't want to take advantage of any of the great new features, you'll at least need to address compatibility issues if any of the changes cause problems with your application.

To help you implement the new features, this column is backed up with detailed documentation on this issue's CD.

THE EXTENDED PRINT RECORD

The 120-byte print record in the previous driver version doesn't have as many free bits available as some programmers would like. So to let you save all possible printing information about a document, Apple decided to allow for extensible print records.

If all you want to do is maintain compatibility with the new driver version, you shouldn't need to change your application at all. But if you want to take advantage of the extended print record -- and implement attractive features such as access to a larger number of paper sizes, tray handling that works with the PrJobMerge function, and the ability to reliably save more user settings from the Page Setup dialog -- you do need to make some minor changes, along the following lines:

  • Because the extended print record can be any size larger than 120 bytes, your application must not make any assumptions about the record's size.

  • Although the locations of fields that are currently defined within the TPrint structure won't change, you should use PrGeneral with the extended print record opcodes (described below) to access any additional fields.

  • When using an extended print record, you'll need to call the extendPrDefault and extendPrValidate functions where you previously would have called the functions PrintDefault and PrValidate. (The new extend functions really just call PrGeneral with specific opcodes, but are more convenient to use than PrGeneral itself.) See "Extending the Print Record" on this issue's CD for more information on the extend functions and how they use the new PrGeneral opcodes.
Those who break the rules might need to make more changes. See the Print Hints column in develop Issue 26 ("The Top 10 Printing Crimes Revisited") for more information.

NEW PRGENERAL OPCODES

LaserWriter version 8.4 adds three new PrGeneral opcodes for dealing with the extended print record: kExtendPrintRecOp (which extends the print record), kGetExtendedPrintRecOp, and kSetExtendedPrintRecOp.

Table 1 gives a complete list of all the PrGeneral opcodes as of June 1996 (but be aware that printing in Mac OS 8 might not implement all of these). These opcodes are all planned to be supported by LaserWriter version 8.4, except for the ones that aren't used by LaserWriter 8 (as noted in the table). Refer to the article "Meet PrGeneral" in develop Issue 3 for more information about PrGeneral.

Table 1. The PrGeneral opcodes

Opcode Operation
4 getRslDataOp
5 setRslOp
6 draftBitsOp
7 noDraftBitsOp
8 getRotnOp
9 NoGrayScl (not used by LaserWriter 8)
10 getPSInfoOp
11 PSIntentionsOp
12 enableColorMatchingOp
13 registerProfileOp (ColorSync 1 only; not used by LaserWriter 8)
14 PSAdobeOp
15 PSPrimaryPPDOp
16 kLoadCommProcsOp
17 kUnloadCommProcsOp
18 kExtendPrintRecOp (LaserWriter version 8.4 and later only)
19 kGetExtendedPrintRecOp (LaserWriter version 8.4 and later only)
20 kPrinterDirectOpCode (not used by any LaserWriter driver)
21 kSetExtendedPrintRecOp (LaserWriter version 8.4 and later only)

NEW PRINT DIALOGS

The print dialogs have been completely redesigned for LaserWriter version 8.4.

Applications that use the approved method of extending the print dialogs will continue to function. But if your application uses a nonstandard method of extending the print dialogs, it's in trouble. The definitive source about how to extend a print dialog is PDlog Expand, available as sample code on this issue's CD and included with the Macintosh Technical Note "Print Dialogs: Adding Items" (PR 09).

The new print dialogs have a pop-up menu that lets the user select between multiple panes of the dialog. In Figure 1, the General pane has been selected from the pop-up menu. When an application adds items to the print dialog, they're added to a pane that has the name of the application. Because of this new multipane dialog, applications that extend the print dialogs in a nonstandard manner will cause many problems, such as dialog items appearing in the wrong locations, standard items being overwritten within the dialog, and standard items being drawn incorrectly.

Figure 1. The new multipane print dialog

Applications also shouldn't assume that the print dialog's foreground color is black or that the background color is white. Furthermore, when applications exit their CDEFs or user items, they should be careful to leave the foreground and background colors as they found them. Other items in the dialog rely on these colors, so if you change them the standard controls in the print dialog could take on unusual colors.

ONE-PASS PRINTING

With LaserWriter version 8.4, when background printing is disabled, printing is one-pass. This means that there are no longer any big spool files to fill up your hard drive, and the first printed page comes out of the printer more quickly (because it doesn't have to wait for the entire document to spool). The downside is that because the LaserWriter driver isn't making two passes over the data to be printed, it might not be able to perform the same optimizations on the PostScript(TM) code as when background printing is enabled.

As a result, jobs printed with background printing disabled might print more slowly, and in a few cases the final quality could suffer. With the advent of one-pass printing, if your application has its own PostScript LaserPrep dictionary, it should use the PREC 103 mechanism for this dictionary. With this mechanism, the driver downloads to the printer the PostScript dictionary contained in the PREC 103 resource before it's needed by application-generated PostScript code. If the application doesn't do this and defines its own PostScript procedures at the page level, these procedures will be undefined as part of the one-pass font-handling mechanism and you'll get PostScript errors (mostly undefined operators, because the operators you defined aren't there).

PORTIONS OF THE CODE IN SHARED LIBRARIES

Some of the functionality of LaserWriter version 8.4 has been broken out into shared libraries, including the following:
  • Converter library -- generation of PostScript code

  • PPD library -- parsing of the PostScript printer description file

  • Preferences and Collection libraries -- storage and retrieval of preferences file data

  • Downloader library -- downloading of PostScript and EPS files to a printer

  • PostScript Utilities library -- PostScript utility functions

  • Communications library -- communications
In the future, Apple may provide APIs to these shared libraries for third parties.

CHANGES TO PARSING AND HANDLING OF PPD FILES

If you're a printer developer, you should know that the way PPD files are parsed and handled has changed in LaserWriter version 8.4. Previous versions of the driver would supply a "Printer's Default" choice so that the user could choose not to decide about a certain feature and accept the default setting of the printer. With version 8.4, the driver will no longer provide this option. If PPD creators want to continue to have a Printer's Default option for a user interface feature (called UIFeature in the PPD specification), they'll have to add it to the PPD file in the list of options for that feature.

Also, common features available through the PPD file will be added to the correct pane of the print dialog. Features that aren't recognized or that are vendor-specific will be placed in their own pane. This can cause problems: if you use a nonstandard naming convention for a common feature, it will be placed with all other unknown features, and if you use a standard name for a nonstandard feature, it will probably end up in the wrong location.

One other change is that you can specify the graphic elements you'd like to use for UI features specified within the PPD file. See "LaserWriter 8.4 PPDs" on the CD for information about how to design your own pane for use with LaserWriter version 8.4. The latest Apple PPD files are the best examples of how to implement the new features.

NEW ERROR CODES

LaserWriter 8 introduced a number of new error codes, but they haven't been documented -- until now, that is. See the unofficial documentation "LaserWriter 8 Errors" on the CD. Future versions of this document will be released as Technotes. These error codes are provided for debugging purposes. Be aware that they may change in the future, so you probably don't want your application to depend on them.

WRAPPING IT UP

That's a quick rundown of the new features of the newest version of the LaserWriter driver. These features should make printing a better experience for the user, should give the developer more flexibility, and should require no changes to most applications. And to top it all off, they're cool!


    RELATED READING

    • "Print Hints: The Top Ten Printing Crimes Revisited" by Dave Polaschek, develop Issue 26.

    • "Meet PrGeneral, the Trap that Makes the Most of the Printing Manager" by Pete "Luke" Alexander, develop Issue 3.

    • Macintosh Technical Note "Print Dialogs: Adding Items" (PR 09).

    • "Extending the Print Record,""LaserWriter 8.4 PPDs," and "LaserWriter 8 Errors," all on this issue's CD.

DAVE POLASCHEK (dpolasch@apple.com) continues to be confused by California. There's nice weather when it isn't baseball season, the earth moves even when he's alone, and it's easier to find good wine than good beer. Dave works in Developer Technical Support (DTS) at Apple. If you'd like more details, look at http://www.best.com/~davep/.*

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Parallels Desktop 13.0.0 - Run Windows a...
Parallels allows you to run Windows and Mac applications side by side. Choose your view to make Windows invisible while still using its applications, or keep the familiar Windows background and... Read more
Mellel 4.0.0 - The word processor for sc...
Mellel is the leading word processor for OS X and has been widely considered the industry standard for long form documents since its inception. Mellel focuses on writers and scholars for technical... Read more
Backblaze 5.0.0.116 - Online backup serv...
Backblaze is an online backup service designed from the ground-up for the Mac. With unlimited storage available for $5 per month, as well as a free 15-day trial, peace of mind is within reach with... Read more
EtreCheck 3.4.4 - For troubleshooting yo...
EtreCheck is an app that displays the important details of your system configuration and allow you to copy that information to the Clipboard. It is meant to be used with Apple Support Communities to... Read more
Luminar 1.2.1 - Powerful, adaptive, conf...
Luminar is the new full-featured image editor that adapts to the way you edit photos. Over 300 essential tools to fix, edit, and enhance your photos with comfort. The future of photo editing is here... Read more
GarageSale 7.0.8 - Create outstanding eB...
GarageSale is a slick, full-featured client application for the eBay online auction system. Create and manage your auctions with ease. With GarageSale, you can create, edit, track, and manage... Read more
Adobe Muse CC 2017 2017.1.0 - Design and...
Muse CC 2017 is available as part of Adobe Creative Cloud for as little as $14.99/month (or $9.99/month if you're a previous Muse customer). Adobe Muse 2017 enables designers to create websites as... Read more
1Password 6.8.1 - Powerful password mana...
1Password is a password manager that uniquely brings you both security and convenience. It is the only program that provides anti-phishing protection and goes beyond password management by adding Web... Read more
Luminar 1.2.1 - Powerful, adaptive, conf...
Luminar is the new full-featured image editor that adapts to the way you edit photos. Over 300 essential tools to fix, edit, and enhance your photos with comfort. The future of photo editing is here... Read more
1Password 6.8.1 - Powerful password mana...
1Password is a password manager that uniquely brings you both security and convenience. It is the only program that provides anti-phishing protection and goes beyond password management by adding Web... Read more

Radiation City (Games)
Radiation City 1.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0 (iTunes) Description: Radiation City Welcome to the world of Radiation City where a great survival adventure awaits you! | Read more »
The best deals on the App Store this wee...
The summer is drawing quickly to a close, but luckily there's a game for every season. It's an excellent week for some bargain shopping if that's what you're after. There are some big names and indie darlings in this week's roundup. It's a great... | Read more »
KORG iMono/Poly (Music)
KORG iMono/Poly 1.0.0 Device: iOS Universal Category: Music Price: $19.99, Version: 1.0.0 (iTunes) Description: *** Special Sale for a limited time to celebrate the debut of KORG iMono/Poly (33% OFF) until Sep 30! *** Reviving a... | Read more »
Super Phantom Cat 2 beginner's guid...
Super Phantom Cat 2 presents a whole new world of fun platforming challenges and perplexing puzzles. It's a well-designed platformer with a bright, neon aesthetic that brings the genre up to date. [Read more] | Read more »
Shadow Fight 2 Special Edition (Games)
Shadow Fight 2 Special Edition 1.0.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0.0 (iTunes) Description: ** New story chapter! **** No Ads! **** No energy! ** The best fighting series on mobile has returned and... | Read more »
4 RPGs like Final Fantasy XV that deserv...
Square Enix announced another Final Fantasy XV spin-off today - Final Fantasy XV Pocket Edition. This mobile, episodic version of the hit RPG gives the game a chibi-fied makeover. The first episode will be free, followed by 9 more premium episodes... | Read more »
Guild sieges and soul gems in latest upd...
Webzen’s MU Origin hit app stores last year, giving fans of fantasy hack-n-slash MMOs like Diablo a new fix to fixate on. This latest update introduces a competitive guild battle, a fresh dungeon challenge, a mini-game and some elemental gems to... | Read more »
Little Red Lie (Games)
Little Red Lie 1.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0 (iTunes) Description: ARE YOU MORE AFRAID OF POVERTY THAN DEATH? Little Red Lie is a narrative-focused, interactive fiction experience that reduces... | Read more »
You can now apply to be Clash of Clans...
Earlier this month, word got out that the Builder, the trusty handiman who tirelessly built every single building inevery singleClash of Clansbase had called it quits. Sick of seeing his work destroyed endless, the Builder has set out for our world... | Read more »
Meshi Quest beginner's guide - how...
Meshi Quest is Square Enix's newest free-to-play release, and it's a real charmer. You start off as the head of a sushi restaurant, upgrading your food and equipment as you serve visitors heaping helpings of your delicious meals. As you progress,... | Read more »

Price Scanner via MacPrices.net

Low Cost Subscription Graphics App Alternativ...
I’m not a fan of the subscription software model, I don’t use any subscription apps. Used to be that you paid your license fee and the app was yours to use indefinitely, or until one opted for a paid... Read more
Clearance 2016 13-inch MacBook Airs, Apple re...
Apple has Certified Refurbished 2016 13″ MacBook Airs available starting at $809. An Apple one-year warranty is included with each MacBook, and shipping is free: – 13″ 1.6GHz/8GB/128GB MacBook Air: $... Read more
2017 13-inch MacBook Airs on sale for $100 of...
B&H Photo new 2017 13″ MacBook Airs on sale today for $100 off MSRP, starting at $899: – 13″ 1.8GHz/128GB MacBook Air (MQD32LL/A): $899, $100 off MSRP – 13″ 1.8GHz/256GB MacBook Air (MQD42LL/A... Read more
Sale! 13-inch 2.3GHz MacBook Pros for $100 of...
B&H Photo has 13″ 2.3GHz MacBook Pros in stock today and on sale for $100 off MSRP including free shipping plus NY & NJ sales tax only: – 13-inch 2.3GHz/128GB Space Gray MacBook Pro (MPXQ2LL... Read more
2016 MacBook Pros, Apple refurbished, availab...
Apple has Certified Refurbished 2016 15″ and 13″ MacBook Pros available starting at $1189. An Apple one-year warranty is included with each model, and shipping is free: – 15″ 2.7GHz Touch Bar Space... Read more
Apple offers Certified Refurbished iPhone 6s...
Apple has Certified Refurbished unlocked iPhone 6s’s and 6s Plus’s available starting at $449. An Apple one-year warranty is included with each phone, and shipping is free: – 16GB iPhone 6s: $449, $... Read more
Apple offers Certified Refurbished Pencils fo...
Apple has Certified Refurbished Apple Pencils available for $85 including free shipping. Their price is $14 off MSRP, and it’s the lowest price available for a Pencil. Read more
2016 15-inch 2.6GHz Touch Bar MacBook Pro ava...
B&H Photo has clearance 2016 15″ 2.6GHz MacBook Pros in stock today and on sale for $500 off original MSRP. Shipping is free, and B&H charges NY & NJ sales tax only: – 15″ 2.6GHz Touch... Read more
21-inch 2.3GHz iMac on sale for $999, save $1...
Amazon has the new 2017 21″ 2.3GHz iMac (MMQA2LL/A) in stock and on sale for $999.99 including free shipping. Their price is $100 off MSRP, and it’s the lowest price available for this model. Read more
Free Instant Translator 2.0 App For iOS Relea...
Mobile application development company, Neoappz has announced the release and immediate availability of Instant Translator 2.0 for iOS devices. Instant Translator is a user-friendly application which... Read more

Jobs Board

*Apple* Solutions Consultant - Apple Inc. (U...
Job Summary As an Apple Solutions Consultant, you'll be the link between our future customers and our products. You'll showcase your entrepreneurial spirit as you Read more
*Apple* Solutions Consultant - Apple Inc. (U...
…about helping others on a team while also delighting customers? As an Apple Solutions Consultant (ASC), you will discover customers needs and help connect them Read more
Sr. Software Engineer, Core Services, *Apple...
…part of the server team that powers various features within the App Store, Apple Music, iBooks, iTunes, and Podcasts. You will be working cross functionally with Read more
SW Engineer *Apple* TV Frameworks - Apple I...
Job Summary The Apple TV team is looking for a software engineer to join us as we work to define the future of the tvOS platform. Key Qualifications You're Read more
*Apple* Retail - Multiple Positions - Apple,...
Job Description: Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.