On 17/02/2014 20:16, 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?
Sure, but I haven't been able to test (and I'm not sure I exactly
understand what it's doing), this is simply typed straight into email -
so at your own risk ....
replace
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
with
put 2 into tStart
repeat for each char curBin in totAlphaData
if char tStart to (tStart+2) of totColorData = binColor then
put bin0 after newAlphaData
else put curBin after newAlphaData
-- -- -- delete char 1 to 4 of totColorData
add 4 to tStart
set the cursor to busy
end repeat
This avoids the deleting of chars which is (very) expensive because it
moves all the rest of the data.
Although you often see the advice to avoid "counting" chunks, in this
case it's OK because indexing by char is fast; it's really counting
lines, items or words that is so expensive.
If I get time later tonight, I'll test this version (and also try out
something else that might be even faster).
-- Alex.
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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