No ideas on speeding it up. The only thought looking at the code is you may want to replace 'char' with 'byte' ( and numToChar with numToByte) since you are really dealing with bytes rather than characters and in future LiveCode versions, char may not always correspond to a single byte.
I might suggest avoiding the delete operation and just try indexing the imageData and alphaData put the number of bytes in totAlphaData into tLoopSize repeat with i=1 to tLoopSize if byte (i*4-2) to (i*4) of totColorData = binColor then put bin0 into byte i of totAlphaData -- else byte i remains as is set cursor to busy wait for 0 milliseconds with messages end repeat set the alphadata of img 1 to totAlphaData On 2/17/2014 3:16 PM, Ray wrote: > That works great! And a little experimenting shows that waiting 0 > milliseconds accomplishes the same goal without significantly slowing > down an already slow handler. Not to sound greedy but you wouldn't > also have any idea how to speed up this loop would you? > > Thanks, > > Ray > > On 2/17/2014 2:57 PM, Paul Dupuis wrote: >> Ray, >> >> Is this behavior (title bar saying "not responding", etc.) happening >> under Windows 8 perchance? >> >> If so, we've seen the same or similar behavior under Windows 8 in long >> repeat loops. We've found that including a "wait for 1 millisecond with >> messages" line in the loop and this mostly lets Windows think the >> application is in fact responding. I say mostly because if you watch the >> task manager, the app switches between "not responding" and responding >> (i.e. no note next to the name) with some regularity. Without the "wait" >> statement in the loop the app is listed in the task bar continuously as >> "not responding" while the loop is executing. >> >> Paul Dupuis >> Researchware >> >> On 2/17/2014 1:24 PM, Ray wrote: >>> Fellow LC Users, >>> >>> I'm trying to provide users with a 'magic wand' style tool. Click an >>> image, pick up the color clicked and turn every pixel of that same >>> color in the image transparent. >>> >>> The loop I've written takes about 30 seconds to run on a 600 by 700 >>> pixel image, which is a problem, but worse, click anywhere before it's >>> finished and Livecode 'appears' to crash. I say 'appears' because the >>> cursor turns into the crash cursor and the title bar displays 'not >>> responding'. After the loop is done Livecode returns to normal. >>> >>> I'll include the loop, below. >>> >>> How do I stop LC from appearing to crash while running this loop, or >>> how to speed it up. >>> >>> Thanks, >>> >>> Ray >>> LinkIt! Software >>> >>> on mouseUp >>> lock messages >>> put the mousecolor into myColor >>> put the mouseloc into myLoc >>> put the imagedata of img 1 into totColorData >>> put the alphadata of img 1 into totAlphaData >>> put numToChar(item 1 of myColor) into binColor >>> put numToChar(item 2 of myColor) after binColor >>> put numToChar(item 3 of myColor) after binColor >>> put numtochar(0) into bin0 -- transparency >>> repeat for each char curBin in totAlphaData >>> if char 2 to 4 of totColorData = binColor then >>> put bin0 after newAlphaData >>> else put curBin after newAlphaData >>> delete char 1 to 4 of totColorData >>> set the cursor to busy >>> end repeat >>> set the alphadata of img 1 to newAlphaData >>> end mouseUp >>> >>> >>> _______________________________________________ >>> use-livecode mailing list >>> use-livecode@lists.runrev.com >>> Please visit this url to subscribe, unsubscribe and manage your >>> subscription preferences: >>> http://lists.runrev.com/mailman/listinfo/use-livecode >> >> _______________________________________________ >> use-livecode mailing list >> use-livecode@lists.runrev.com >> Please visit this url to subscribe, unsubscribe and manage your >> subscription preferences: >> http://lists.runrev.com/mailman/listinfo/use-livecode > > > _______________________________________________ > use-livecode mailing list > use-livecode@lists.runrev.com > Please visit this url to subscribe, unsubscribe and manage your > subscription preferences: > http://lists.runrev.com/mailman/listinfo/use-livecode > -- Paul Dupuis Cofounder *Researchware, Inc.* http://www.researchware.com http://www.twitter.com/researchware http://www.facebook.com/researchware http://www.linkedin.com/company/researchware-inc https://plus.google.com/+Researchware/ <http://plus.google.com/+Researchware/> _______________________________________________ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
