TweetFollow Us on Twitter

GXGraphic Extension

Volume Number: 13 (1997)
Issue Number: 10
Column Tag: develop

Using the GXGraphics Extension

by Ingrid Kelly and Robin Mikawa, Apple Developer Technical Support

Using The GXGraphics Extension

Starting with Mac OS 8.0, the QuickDraw GX environment no longer supports the GX Printing Manager API. Although this decision will require significant changes to existing system software and applications, it will allow us to transition to a unified printing architecture that will improve the compatibility of QuickDraw GX software in the classic QuickDraw environment. Mac OS 8.0 includes the GXGraphics 1.1.6 extension, which provides the advanced Graphics and Typography capabilities of QuickDraw GX, a QuickDraw GX codec in the QuickTime 2.5 extension, and a fully integrated version of the Collection Manager. This article includes:

  • The changes needed for an application (GX aware, GX savvy, and GX dependent) to support GX Printing on Mac OS 8.0.
  • Where to get the current version of the GXGraphics extension (1.1.3) and a description of any differences with GXGraphics 1.1.6 included with Mac OS 8.0.
  • Any known incompatibilities or limitations of the GXGraphics extension, as well as known solutions to these problems. This Article is intended to help developers who wish to transition their GX products to support QuickDraw GX on Mac OS 8.0.

Note: Throughout this Article, the term, "classic printing architecture," refers to the Macintosh Printing Manager described in Chapter 9 of Inside Macintosh: Imaging With QuickDraw. "QuickDraw GX" refers to the full GX environment (i.e., Graphics, Typography, and Printing) and "GXGraphics" refers to the partial GX implementation provided by the GXGraphics extension (i.e., Graphics and Typography).

Features Not Supported in Mac OS 8.0

Following is a list of key features that are currently available in QuickDraw GX 1.1.3/1.1.5 that will no longer be available to developers under the GXGraphics 1.1.6 strategy:

  • GX Printer Driver APIs: GX Printer drivers will no longer be supported. All developers need to have a classic printer driver for their device.
  • GX Printing Extensions: GX Extensions will no longer be supported. Some developers may be able to roll their GX extension functionality into their application or driver.
  • Custom page formatting (the ability to arbitrarily specify page formatting within a single document): This feature will no longer be available. This feature could be implemented using the extended print record architecture added with LaserWriter version 8.4. See develop Journal Issue 27: 'The All-New LaserWriter Driver Version 8.4' for more information on the extended print record.
  • Portable Digital Document authoring: Developers will no longer be able to author PDDs via the GX Printing APIs. Also, SimpleText will not display PDDs under QuickDraw GX 1.1.6. You should convert PDD files to a different format, such as Adobe Acrobat PDF files, before attempting to use them with Mac OS 8 or QuickDraw GX 1.1.6
  • Vector Print Driver API: Under the new GX model, there will no longer be a custom API for vector printer driver developers. Vector printer drivers will have to be written with the classic printing architecture.

Overview of the GXGraphics Extension

The GXGraphics extension is a system extension that adds powerful graphics and typographic capabilities to your user's Macintosh without requiring the full QuickDraw GX package to be installed on your user's machine. The extension that we are currently licensing and distributing, GXGraphics 1.1.3, covers all QuickDraw GX graphics and typography functionality up to and including QuickDraw GX version 1.1.3.

GXGraphics 1.1.3

The GXGraphics 1.1.3 extension contains GX graphics and typography, but does not contain GX Printing. There are stubs for the GX Printing calls in QuickDrawGXLib/GXGraphics 1.1.3 but they do not work. This extension has been released and tested on 7.5.1 through 7.6. See Table 1 for more specific details.

GXGraphics 1.1.6

The GXGraphics 1.1.6 release contains GX graphics and typography, but will no longer have the printing stubs available. This extension has been tested and released for Mac OS 8.0. See Table 1 for more specific details.

NameVersionComponent Gestalt Selector
QuickDraw GX1.1.3, 1.1.5QuickDraw GX* qdgx (obsolete)
GX Printing* pmgr
GX Graphics* grfx
Collections Mgr* cltn
GXGraphics1.1.3GX Printing**
GXGraphics* grfx
Collections Mgr**
GXGraphics1.1.6GXGraphics* grfx

* APIs are exported and available
** APIs are exported but not available; you should use the gestalt selector on application launch to verify whether or not the functions are implemented.

Table 1. Differences in the QuickDraw GX Releases.

Note: With Mac OS 8.0, the Collections Manager APIs have been rolled out of QuickDraw GX and into the system.

Application Changes

Since the GX printing architecture will no longer be supported for Mac OS, any software that does not already have a solution using classic QuickDraw printing will need to be updated. For the majority of applications, the recommended solution for Mac OS 8.0 is to use the QuickTime compression/decompression mechanism for imaging QuickDraw GX data. The basic technique is to encapsulate the QuickDraw GX image in a compressed data format using the object flattening functions from QuickDraw GX. Once the compressed image data is created, it may be passed to the QuickDraw GX codec and drawn using the QuickTime image compression functions or embedded within a QuickDraw picture and drawn using the DrawPicture function. In either case, the compressed data is passed to the the low-level QuickDraw drawing routines through the StdPix bottleneck routine. StdPix decompresses the data using the QuickDraw GX codec and passes the decompressed data to the bitsProc bottleneck routine when rendering the image.

LaserWriter drivers starting with version 8.3 recognize compressed data that may be drawn using QuickTime, like QuickDraw GX flattened objects. For Mac OS 8.0, the LaserWriter driver has been modified to render the QuickDraw GX data at the device resolution of the printer. When despooling, the printer driver changes the resolution of the offscreen drawing port and uses the QuicDraw GX codec to rasterize the compressed data. The QuickDraw printer drivers from Apple render the compressed data during spooling and use the resolution of the active graphics port. Application developers may wish to use the device resolution commands of the PrGeneral routine to improve the quality of their printed images as described in "Meet PrGeneral, the Trap That Makes the Most of the Printing Manager," in develop 3.

General Changes For All Applications

The sample code for this Article includes updated versions of three QuickDraw GX user libraries, CodecLibrary, PrintingLibrary, and StorageLibrary, that may be used to simplify the conversion of your software. The TwoFace sample application supports the basic job, format, dialog, and spooling functions of the QuickDraw GX Printing Manager. It uses an abstraction layer provided by the PrintingLibrary to handle printing through the QuickDraw GX and classic QuickDraw printing architectures, depending on which environment is available when the application is launched. All the changes described in this section are handled automatically by the user libraries if you simply convert any references to the QuickDraw GX Printing Manager, including the gxJob and gxFormat data types, to the equivalent functions and data types of the PrintingLibrary.

1) Check the correct gestalt selector. Use the individual grfx and pmgr gestalt selectors rather than the obsolete qdgx gestalt selector.

Boolean gPrintingArchitecture = false;
long theFeature;

if ( Gestalt(gestaltGraphicsVersion, &theFeature) != noErr )
		return;

if ( Gestalt(gestaltGXPrintingMgrVersion, &theFeature)!= noErr )
	gPrintingArchitecture = kQDPrArch;
else
	gPrintingArchitecture = kGXPrArch;

2) For 68000 applications that use A-trap addresses to determine which parts of the GX environment are installed, use the individual gestalt selectors instead. This technique is not recommended but has been used by some applications in the past. If this is the case for your application, verify that you are checking the correct A-trap addresses:

Trap Address Technology
ABFEGX Printing
A832GX Graphics
ABF6Collections Manager

3) During initialization of a PowerPC application, check if the QuickDraw GX Printing library is installed. If the application is "weak" linked to the library, the Process Manager will launch it even if the library is missing, although the Code Fragment Manager will not resolve the addresses of the functions in the library. If the application calls any of these functions, it will crash. Your application should check if any of the Printing Manager functions cannot be resolved and exit gracefully if the library is missing. Note that the check could be performed against any function you call in the library. GXInitPrinting is often the first function that is called from the Printing Manager, so it is convenient.

if ( (UInt32)GXInitPrinting == UnresolvedCFragSymbolAddress )
	gPrintingArchitecture = kQDPrArch;

4) During printing, create a single picture shape for the contents of each page in the document. The PrintingLibrary includes a sample viewport filter function that handles this task from within the printing loop.

5) Use GXFlattenShape to create the compressed data for the QuickDraw GX codec. GXFlattenShape is described in detail in Inside Macintosh: QuickDraw GX Objects 2-88 to 2-89.

6) Use DecompressImage as described in "Printing Images Faster With Data Compression", in develop 24 (December 1995) to create the QuickDraw picture with the embedded QuickDraw GX data. When the application calls the standard DrawPicture function to display the image containing the compressed QuickDraw GX data, the StdPix function decompresses the image by invoking the Image Compression Manager. The CodecLibrary implements a function, GXCdShapeToPicture, that encodes the QuickDraw GX data as QuickTime compressed data and creates a PicHandle; an application may use this routine to create a QuickDraw picture prior to entering the printing loop or to convert a QuickDraw GX document to the QuickDraw PICT file format. DecompressImage is described in detail in Inside Macintosh: QuickTime, pages 3-78 to 3-79.

7) An alternative to Step 6 is to pass the flattened QuickDraw GX data directly to the custom StdPix bottleneck installed by the printer driver during printing. The CodecLibrary implements a function, GXCdDrawShape, that converts the QuickDraw GX data to a QuickTime encoded PixMap data structure, which it passes to the QuickDraw GX codec from within the printing loop. StdPix is described in detail in Inside Macintosh: QuickTime, pages 3-138 to 3-139.

Specific Changes Required Based on Level of Support

Here is an outline of the changes GX applications will need to make. They are outlined according to the level of GX support.

GX Unaware (no knowledge of GX)

  • No changes are needed

GX Aware (implements core GX Printing features)

  • Classic Printing code should be added using the new printing user library. (Step 1-7)

GX Savvy (implements support for Graphics, Typography and Printing)

  • Classic Printing code should be added using the new printing user library. (Step 1-7)

GX Dependent (requires GX to be installed to function)

  • Classic Printing code should be added using the new printing user library. (Step 1-7)

Additional Changes

Custom Page formatting

  • Currently, applications that wish to implement custom page formatting will have to spool multiple jobs per document. One job for each change in the page formatting.

It is important to note, that even today -- on System 7.5.x -- it is possible for an application using GXGraphics 1.1.x to print using the classic printing mechanism described above.

GX Printing Extension Changes

Printing extensions have been used for a wide variety of things in the history of GXPrinting. However, despite their potential for optimizing printing from certain kinds of applications, they have never been developed or used to their full potential by many developers. Unfortunately, under the new GX model , GX extensions are no longer available. Some of the functionality that developers have used GX extensions for can be rolled into classic applications or drivers, but that will have to be determined by the developer on a case-by-case basis.

GX Printer Driver Changes

Under the new GX model, GX printer drivers will no longer be supported. There is no transition plan for these drivers.

Classic Printer Driver Changes

  • In the world of GXGraphics 1.1.6 it will be desirable to print GX objects to classic printer drivers.

Raster

  • For raster printer drivers, the output from an updated GX application should match the high quality output today from GX drivers.

PostScript

For PostScript printer drivers however, there will be some changes required to add support for printing high-quality GX objects. We are currently working on determining what the best delivery mechanism for these changes will be (a library, an new API, atc.). As soon as we have a better idea of how to do this, we will update this Article to reflect the necessary changes.

PDD Changes

Under the new GX architecture, there is no way to author PDD documents. Also, SimpleText will not display PDD's under QuickDraw GX 1.1.6. You should convert PDD files to a different format, such as Adobe Acrobat PDF files, before attempting to use them with Mac OS 8 or QuickDraw GX 1.1.6.

Incompatibilities and Limitations

This section describes the known incompatibilities and limitations, and their solutions for the GXGraphics 1.1.6 extension:

  • Current versions of printer drivers may generate large spool files and take a long time to print when printing documents containing QuickDraw GX data. In addition, QuickDraw GX data printed to the Apple Color LaserWriter may be printed at less than full printer resolution. These problems will be addressed in future versions of printer drivers from Apple and other vendors.
  • With ATM 4.0.2, some PDF documents that use ATM substitution fonts may not print correctly using the LaserWriter 8 driver. This problem will be fixed in a future version of LaserWriter 8 which will be available in late summer 1997.
  • ATM 3.8.3 and 4.0 do not currently recognize that QuickDraw GX is installed when the GXGraphics extension is in your user's system. This causes problems with Type-1 enabled fonts. This problem has been fixed with the 4.0.2 release of ATM by Adobe Systems. Check with Adobe for a newer version of ATM Deluxe.
  • Some older QuickDraw pictures with embedded QuickDraw GX data may print with random noise in the background of the picture. This problem will be fixed in a future version of QuickTime.
  • Some QuickDraw GX data may print incorrectly in low memory conditions. You may notice that parts of the image repeat rather than the entire image printing correctly. This problem is in the QuickDraw GX QuickTime Codec and will be fixed in a future version of QuickTime.

Where To Get GXGraphics 1.1.6 And How To License It

The GXGraphics 1.1.6 extension

  • GXGraphics 1.1.6 is only available as part of the Mac OS 8.0 package. It is equivalent to the GXGraphics 1.1.3 release with a new installer and PPC library changes.

Software Licensing

  • For developers who wish to ship the GXGraphics extension with their product, you must contact Software Licensing at sw.license@apple.com or call them at 512-919-2645. Reference the QuickDraw GX software license to make sure you get the appropriate licensing agreement.

Conclusion

By simply following the above steps, you should easily be able to convert your GX applications into a viewable applications that your users will be able to use without having the complete GX extension installed.

Further References

  • Inside Macintosh: Imaging With QuickDraw
  • Inside Macintosh: QuickDraw GX Graphics
  • Inside Macintosh: QuickDraw GX Objects
  • Inside Macintosh: QuickTime
  • "The All-New LaserWriter Driver Version 8.4", in develop 27 by Dave Polaschek.
  • "Printing Images Faster With Data Compression", in develop 24 by David Gelphman.
  • "Meet PrGeneral, the Trap That Makes the Most of the Printing Manager", in develop issue 3 by Pete Alexander.
  • "A Print Loop That Cares--The Sequel", Technote 1092 by Ingrid Kelly.
  • "Adding Items to the Printing Manager's Dialogs", Technote 1080 by Ingrid Kelly and Dave Polaschek.

Acknowledgments

Thanks to Paul Danbold, David Goldsmith, David Hayward, Dan Lipton, and Dave Opstad.


Ingrid Kelly works in Apple's Developer Technical Support group answering questions about graphics, color and printing on the Mac OS. In a previous life, she worked at NASA in the Human Factors Research branch studying aircraft pilots, but she finds that studying people at Apple is much more interesting!

Robin Mikawa has recently returned to her first love as a graphics engineer on the QuickDraw GX project. A three-year stint on the WordScript engineering team has instilled her a love for typographical truffles, multilingual system software, and noodle-based dishes from all parts of the world.

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Viber 11.9.1 - Send messages and make fr...
Viber lets you send free messages and make free calls to other Viber users, on any device and network, in any country! Viber syncs your contacts, messages and call history with your mobile device, so... Read more
Vallum 3.3.2 - $15.00
Vallum is a little tool that helps you monitor and block apps connections and throttle apps bandwidth. It is able to intercept connections at the application layer, and hold them while you decide... Read more
Microsoft OneNote 16.31 - Free digital n...
OneNote is your very own digital notebook. With OneNote, you can capture that flash of genius, that moment of inspiration, or that list of errands that's too important to forget. Whether you're at... Read more
Apple Pages 8.2.1 - Apple's word pr...
Apple Pages is a powerful word processor that gives you everything you need to create documents that look beautiful. And read beautifully. It lets you work seamlessly between Mac and iOS devices, and... Read more
Numbers 6.2.1 - Apple's spreadsheet...
With Apple Numbers, sophisticated spreadsheets are just the start. The whole sheet is your canvas. Just add dramatic interactive charts, tables, and images that paint a revealing picture of your data... Read more
f.lux 39.9873 - Adjusts the color of you...
f.lux makes the color of your computer's display adapt to the time of day, warm at night and like sunlight during the day. Ever notice how people texting at night have that eerie blue glow? Or wake... Read more
Deeper 2.5.0 - Enable hidden features in...
Deeper is a personalization utility for macOS which allows you to enable and disable the hidden functions of the Finder, Dock, QuickTime, Safari, iTunes, login window, Spotlight, and many of Apple's... Read more
NTFS 15.5.71 - Provides full read and wr...
NTFS breaks down the barriers between Windows and macOS. Paragon NTFS effectively solves the communication problems between the Mac system and NTFS. Write, edit, copy, move, delete files on NTFS... Read more
MTR 5.3.0.0 - The Mac's oldest and...
MTR (was MacTheRipper)--the Mac's oldest and smartest DVD-backup app. MTR - the complete toolbox, not a one-trick, point-and-click extractor. MTR is intended for making fair-use, backup copies of... Read more
Keynote 9.2.1 - Apple's presentatio...
Easily create gorgeous presentations with the all-new Keynote, featuring powerful yet easy-to-use tools and dazzling effects that will make you a very hard act to follow. The Theme Chooser lets you... Read more

Latest Forum Discussions

See All

Black Desert Mobile gets an official rel...
Pearl Abyss has just announced that its highly-anticipated MMO, Black Desert Mobile, will launch globally for iOS and Android on December 11th. [Read more] | Read more »
Another Eden receives new a episode, cha...
Another Eden, WFS' popular RPG, has received another update that brings new story content to the game alongside a few new heroes to discover. [Read more] | Read more »
Overdox guide - Tips and tricks for begi...
Overdox is a clever battle royale that changes things up by adding MOBA mechanics and melee combat to the mix. This new hybrid game can be quite a bit to take in at first, so we’ve put together a list of tips to help you get a leg up on the... | Read more »
Roterra Extreme - Great Escape is a pers...
Roterra Extreme – Great Escape has been described by developers Dig-It Games as a mini-sequel to their acclaimed title Roterra: Flip the Fairytale. It continues that game's tradition of messing with which way is up, tasking you with solving... | Read more »
Hearthstone: Battlegrounds open beta lau...
Remember earlier this year when auto battlers were the latest hotness? We had Auto Chess, DOTA Underlords, Chess Rush, and more all gunning for our attention. They all had their own reasons to play, but, at least from where I'm standing, most... | Read more »
The House of Da Vinci 2 gets a new gamep...
The House of Da Vinci launched all the way back in 2017. Now, developer Blue Brain Games is gearing up to deliver a second dose of The Room-inspired puzzling. Some fresh details have now emerged, alongside the game's first official trailer. [Read... | Read more »
Shoot 'em up action awaits in Battl...
BattleBrew Productions has just introduced another entry into its award winning, barrelpunk inspired, BattleSky Brigade series. Whilst its previous title BattleSky Brigade TapTap provided fans with idle town building gameplay, this time the... | Read more »
Arcade classic R-Type Dimensions EX blas...
If you're a long time fan of shmups and have been looking for something to play lately, Tozai Games may have just released an ideal game for you on iOS. R-Type Dimensions EX brings the first R-Type and its sequel to iOS devices. [Read more] | Read more »
Intense VR first-person shooter Colonicl...
Our latest VR obsession is Colonicle, an intense VR FPS, recently released on Oculus and Google Play, courtesy of From Fake Eyes and Goboogie Games. It's a pulse-pounding multiplayer shooter which should appeal to genre fanatics and newcomers alike... | Read more »
PUBG Mobile's incoming update bring...
PUGB Mobile's newest Royale Pass season they're calling Fury of the Wasteland arrives tomorrow and with it comes a fair chunk of new content to the game. We'll be seeing a new map, weapon and even a companion system. [Read more] | Read more »

Price Scanner via MacPrices.net

Weekend Sale: Apple AirPods Pro for $234.98 a...
Abt Electronics has Apple’s new AirPods Pro in stock and on sale today for $234.98 including free shipping and free returns. Their price is $15 off Apple’s MSRP for these AirPods and tie Amazon... Read more
New 2019 16″ MacBook Pros on sale for $100 of...
Apple Authorized Reseller Adorama has new 2019 16″ MacBook Pros on sale today for $100 off Apple’s MSRP, each including free shipping. In addition, Adorama charges sales tax for NY & NJ residents... Read more
Apple Watch Series 3 GPS models on sale for l...
Amazon has Apple Watch Series 3 GPS models on sale starting at only $179. There prices are the lowest we’ve ever seen for these models from any Apple reseller. Choose Amazon as the seller rather than... Read more
iOS Bug In Facebook News Feed Lets Device Ca...
NEWS: 11.15.19- Users of the Facebook social media platform’s mobile app running on iOS devices won’t, like, this piece of news one bit in where a bug in the News Feed gave access to the camera... Read more
16″ MacBook Pros on sale! Preorder at Amazon...
Apple’s new 16″ MacBook Pros were only introduced yesterday, but Amazon is already offering a $100 discount on preorders. Prices for the base 6-Core 16″ MacBook Pros start at $2299: – 2019 16″ 2.6GHz... Read more
Use our exclusive MacBook Price Trackers to f...
Our Apple award-winning MacBook price trackers are the best place to look for the best sales & lowest prices on new and clearance MacBook Airs and MacBook Pros–including Apple’s new 16″ MacBook... Read more
New November Verizon iPhone deal: Get an iPho...
Verizon has the 64GB iPhone Xr on sale for 50% off for a limited time, plus they will include a free $200 prepaid MasterCard and a free Amazon Echo Dot. That reduces their price for the 64GB iPhone... Read more
Apple cuts prices on clearance, refurbished 2...
Apple has clearance 2018 15″ 6-Core Touch Bar MacBook Pros, Certified Refurbished, now available starting at only $1829. Each model features a new outer case, shipping is free, and an Apple 1-year... Read more
Up to $450 price drop on clearance 15″ MacBoo...
B&H Photo has dropped prices Apple’s 2019 15″ 6-Core and 8-Core MacBook Pros by $400-$450 off original MSRP, starting at $1999, with free overnight shipping available to many addresses in the US... Read more
Here’s how to save $200 on Apple’s new 16″ Ma...
Apple has released details of their Education discount associated with the new 2019 16″ 6-Core and 8-Core MacBook Pros. Take $200 off the price of the new 8-Core model (now $2599) and $200 off the 16... Read more

Jobs Board

Best Buy *Apple* Computing Master - Best Bu...
**746887BR** **Job Title:** Best Buy Apple Computing Master **Job Category:** Store Associates **Store NUmber or Department:** 001512-Ankeny-Store **Job Read more
Best Buy *Apple* Computing Master - Best Bu...
**746836BR** **Job Title:** Best Buy Apple Computing Master **Job Category:** Sales **Store NUmber or Department:** 000341-Scranton-Store **Job Description:** **What Read more
QA Manager, *Apple* - CBS Corporation (Unit...
# QA Manager, Apple **REF#:** 35331 **CBS BUSINESS UNIT:** CBS Interactive **JOB TYPE:** Full-Time Staff **JOB SCHEDULE:** **JOB LOCATION:** Burbank, CA **ABOUT Read more
*Apple* Mobility Pro - Best Buy (United Stat...
**744315BR** **Job Title:** Apple Mobility Pro **Job Category:** Store Associates **Store NUmber or Department:** 000662-Auburn AL-Store **Job Description:** At Best Read more
Nurse Practitioner - Field Based (San Bernard...
Nurse Practitioner - Field Based (San Bernardino, CA, Apple Valley, Hesperia) **Location:** **United States** **New** **Requisition #:** PS30312 **Post Date:** 4 Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.