TweetFollow Us on Twitter

Oct 97 - Tips

Volume Number: 13 (1997)
Issue Number: 10
Column Tag: Tips & Tidbits

Tips & Tidbits

By Steve Sisak

Colorizing Pixmaps in PICT Images

In a progect I am working on, I have a set of PICT resources that are used to draw a background for my app's user interface. The PICT's are used to represent modular panels and the the user is allowed to colorize these backing panels. The code to colorize the backing pixmaps is relatively simple, but the Mac OS provides a gotcha.

The basic technique uses CopyBits to colorize the pixel data by setting the foreground and background colors of the destination port. The problem is that if you set the colors in the port before playing back the picture, the DrawPicture routine undoes your work for you and the pixel data from the PICT is not colorized. The following code uses the QuickDraw bottlenecks to circumvent the problem. To use it, call DrawColorizedPicture instead of DrawPicture and add the colorization colors you want as parameters.

For example:

  RGBColor red = {0xffff,0,0};
  RGBColor black = {0,0,0};
  Rect   bounds;

  // turn a grayscale image into a red-scale image:
  bounds = (**aPicHandle).bounds;
  DrawColorizedPicture(aPicHandle, &bounds, &black, &red);

Here is the code that implements DrawColorizedPicture:

// Define some global variables to pass the colorization information
RGBColor gFGColor;
RGBColor gBGColor;

// here is the overriden bottleneck (myQDBitsProcPtr).
// it sets up the color environment before actually coping the pixmap

pascal void myQDBitsProcPtr(BitMap *srcBits, Rect *srcRect, 
         Rect *dstRect, short mode, RgnHandle maskRgn)
{
  GrafPtr     curPort;
  RGBColor    saveFG;
  RGBColor    saveBG;

  GetPort(&curPort);  // get the context

  // save the fore- and background colors
  saveFG = ((CGrafPort*)curPort)->rgbFgColor;
  saveBG = ((CGrafPort*)curPort)->rgbBkColor;

  RGBForeColor(&gFGColor);  // set the foreground color
  RGBBackColor(&gBGColor);  // set the background color

  // call the standard routine
  StdBits(srcBits, srcRect, dstRect, mode, maskRgn);

  RGBForeColor(&saveFG);  // restore the foreground color
  RGBBackColor(&saveBG);  // restore the background color
}

// DrawColorizedPicture works just like DrawPicture, except it colorizes the
// the pixelmap portions of the picture according to the global variables
// gFGColor and gBGColor. It assumes the target port is a color port

pascal void DrawColorizedPicture(PicHandle ph, 
  Rect *targetBounds, RGBColor *fg, RGBColor *bg)
{
  CQDProcs     myProcs;        // new bottlenecks
  CQDProcs     *oldProcs;      // saved bottlenecks
  GrafPtr     curPort;         // the active GrafPort
  static QDBitsUPP theUPP = NULL;  // the UPP for our StdBits replacement


  if (theUPP == NULL) {    // allocate the UPP if it does not exist
    theUPP = NewQDBitsProc(myQDBitsProcPtr);
  }

  gFGColor = *fg;    // communicate colorization to the bottleneck
  gBGColor = *bg;
  GetPort(&curPort);      // find the current port
  SetStdCProcs(&myProcs); // initialize the bottleneck record
  myProcs.bitsProc = theUPP;  // insert our StdBits Bottleneck

  // save the previous Bottleneck record
  oldProcs = ((CGrafPort*)curPort)->grafProcs; 

  // attach our bottleneck record
  ((CGrafPort*)curPort)->grafProcs = &myProcs; 

  DrawPicture(ph, targetBounds);    // draw the picture

  // restore the bottlneck record
  ((CGrafPort*)curPort)->grafProcs = oldProcs; 
}

B.J. Buchalter
bj@metric-halo.com

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

FoldersSynchronizer 4.2.1 - Synchronize...
FoldersSynchronizer is a popular and useful utility that synchronizes and backs-up files, folders, disks and boot disks. On each session you can apply special options like Timers, Multiple Folders,... Read more
Simon 4.0.2 - Monitor changes and crashe...
Simon monitors websites and alerts you of crashes and changes. Select pages to monitor, choose your alert options, and customize your settings. Simon does the rest. Keep a watchful eye on your... Read more
Cocktail 8.1.2 - General maintenance and...
Cocktail is a general purpose utility for OS X that lets you clean, repair and optimize your Mac. It is a powerful digital toolset that helps hundreds of thousands of Mac users around the world get... Read more
Cyberduck 4.6.4 - FTP and SFTP browser....
Cyberduck is a robust FTP/FTP-TLS/SFTP browser for the Mac whose lack of visual clutter and cleverly intuitive features make it easy to use. Support for external editors and system technologies such... Read more
Herald 5.0.2 - Notification plugin for M...
Note: Versions 2.1.3 (for OS X 10.7), 3.0.6 (for OS X 10.8), and 4.0.8 (for OS X 10.9) are no longer supported by the developer. Herald is a notification plugin for Mail.app, Apple's Mac OS X email... Read more
DEVONthink Pro 2.8.3 - Knowledge base, i...
Save 10% with our exclusive coupon code: MACUPDATE10 DEVONthink Pro is your essential assistant for today's world, where almost everything is digital. From shopping receipts to important research... Read more
Boom 2 1.0.1 - System-wide pro audio app...
Boom 2 is a system-wide volume booster and equalizer app that is designed especially for OS X 10.10 Yosemite. It comes with a smart interface, self-calibrates itself according to your Mac, offers... Read more
Apple Security Update 2015-001 - For OS...
Apple Security Update 2015-001 is recommended for all users and improves the security of OS X. For detailed information about the security content of this update, please visit: http://support.apple.... Read more
Drive Genius 4.0.1 - Powerful system uti...
Drive Genius 4 gives you faster performance from your Mac while also protecting it. The award-winning and improved DrivePulse feature alerts you to hard drive issues before they become major problems... Read more
Yosemite Cache Cleaner 9.0.3 - Clear cac...
Yosemite Cache Cleaner is an award-winning general purpose tool for OS X. YCC makes system maintenance simple with an easy point-and-click interface to many OS X functions. Novice and expert users... Read more

Unlock Sunshine Girl in Ironkill with th...
Unlock Sunshine Girl in Ironkill with this special 148Apps code Posted by Rob Rich on January 29th, 2015 [ permalink ] Robo-fighter Ironkill has been out on iOS a | Read more »
Crossroad Zombies Review
Crossroad Zombies Review By Jordan Minor on January 29th, 2015 Our Rating: :: CROSSWALKING DEADiPad Only App - Designed for the iPad Crossroad Zombies is a rough draft of a cool genre mash-up.   | Read more »
Blood Brothers 2 – Tips, Cheats, and Str...
War is hell: Is it the kind of hell you want to check out? Read our Blood Brothers 2 review to find out! Blood Brothers 2, DeNA’s follow-up to the original Blood Brothers, is an intriguing card collecting / role-playing / strategy hybrid. There’s... | Read more »
Blood Brothers 2 Review
Blood Brothers 2 Review By Nadia Oxford on January 29th, 2015 Our Rating: :: AN AGGRAVATING RELATIVEUniversal App - Designed for iPhone and iPad Blood Brothers 2 is built on a simple, solid foundation, but its free-to-play system... | Read more »
I AM BREAD, the Toast of the Town, is Ro...
Have you ever dreamt of being deliciously gluten-y? Do you feel passionate about Rye and Wheat? The guys at Bossa Studios do and that is why they are bringing I AM BREAD to iOS soon. The loafy app will feature all the new content that is being... | Read more »
Fahrenheit: Indigo Prophecy Remastered R...
Fahrenheit: Indigo Prophecy Remastered Review By Jennifer Allen on January 29th, 2015 Our Rating: Universal App - Designed for iPhone and iPad 10 years after its initial release and Fahrenheit: Indigo Prophecy still feels like a... | Read more »
Evolve: Hunters Quest is a Match-3 That...
Evolve: Hunters Quest is a Match-3 That Has You Hunting Up Some Big Game. Posted by Jessica Fisher on January 29th, 2015 [ permalink ] | Read more »
Destructamundo Review
Destructamundo Review By Jordan Minor on January 29th, 2015 Our Rating: :: WRECKING CREWUniversal App - Designed for iPhone and iPad Destructamundo blows up real good.   | Read more »
The Sandbox Gets Exclusive Update, Adds...
The Sandbox Gets Exclusive Update, Adds Invincible Characters Campagin Posted by Tre Lawrence on January 29th, 2015 [ permalink ] | Read more »
Mean Girls: The Game Review
Mean Girls: The Game Review By Jordan Minor on January 29th, 2015 Our Rating: :: FETCHUniversal App - Designed for iPhone and iPad A Mean Girls tower defense game makes way more sense than you’d think.   | Read more »

Price Scanner via MacPrices.net

Back in stock: Refurbished iPod nanos for $99...
The Apple Store has Apple Certified Refurbished 16GB iPod nanos available for $99 including free shipping and Apple’s standard one-year warranty. That’s $50 off the cost of new nanos. Most colors are... Read more
New Good Management Suite Simplifies Enterpri...
Good Technology has announced the availability of the Good Management Suite, a comprehensive cross-platform solution for organizations getting started with mobile business initiatives. Built on the... Read more
15-inch 2.0GHz Retina MacBook Pro (refurbishe...
The Apple Store has Apple Certified Refurbished previous-generation 15″ 2.0GHz Retina MacBook Pros available for $1489 including free shipping plus Apple’s standard one-year warranty. Their price is... Read more
15-inch 2.5GHz Retina MacBook Pro on sale for...
Amazon has the 15″ 2.5GHz Retina MacBook Pro on sale for $2319.99 including free shipping. Their price is $180 off MSRP, and it’s the lowest price available for this model from any reseller. Read more
iPad Turns Five – The ”Book Mystique
Five years ago this week, the late Steve Jobs took the stage at an Apple special press event to unveil the first Apple iPad — a slab-shaped, hand-holdable device that was to shake the personal... Read more
Sale! 15-inch Retina MacBook Pros for up to $...
B&H Photo has the new 2014 15″ Retina MacBook Pros on sale for $150 off MSRP for a limited time. Shipping is free, and B&H charges NY sales tax only: - 15″ 2.2GHz Retina MacBook Pro: $1889.99... Read more
Apple refurbished Mac minis for up to $150 of...
The Apple Store has restocked Apple Certified Refurbished 2014 Mac minis, with models available starting at $419. Apple’s one-year warranty is included with each mini, and shipping is free: - 1.4GHz... Read more
Apple Releases New Tranche Of OS Updates For...
Apple has released incremental bugfix and security updates for its most recent Mac and iOS versions. OS X Yosemite 10.10.2 Update Apple says this update includes the following improvements: Resolves... Read more
Samsung To Be Main Supplier Of A9 Chips For i...
Korea’s Maeil Business Newspaper reports that Samsung has beat out its chipmaking rivals, Taiwan’s Qualcomm and TSMC, as supplier of chipsets for the next generations of both its own Galaxy S6 and... Read more
Save up to $340 on iMacs with Apple Certified...
The Apple Store has Apple Certified Refurbished iMacs available for up to $340 off the cost of new models. Apple’s one-year warranty is standard, and shipping is free. These are the best prices on... Read more

Jobs Board

*Apple* Retail - Multiple Positions(US) - Ap...
Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, you re also the Read more
*Apple* Systems Engineer - Pre Sales, Educat...
…is responsible for proactively providing technical expertise to drive sales of Apple solutions into assigned accounts. The SE architects, validates, and assists in Read more
*Apple* Solutions Consultant - Retail Sales...
As an ambassador of the Apple brand, the ASC is accountable for driving sales performance by: Connecting with customers. Discovering customers' needs and values. Showing Read more
*Apple* Solutions Consultant - Retail Sales...
As an ambassador of the Apple brand, the ASC is accountable for driving sales performance by: Connecting with customers. Discovering customers' needs and values. Showing Read more
*Apple* Tree Children's Center is hirin...
Apple Tree Learning Center is Hiring Preschool Teachers! Phoenix Childrens Academy is a national leader in the early childhood education industry and we are currently Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.