Image Processing Makes Livecode Appear to Crash

[Ray]

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
>>
>>
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