[Tcl-bugs] [ tktoolkit-Bugs-919066 ] Slow processing irregular transparencies

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Bugs item #919066, was opened at 2004-03-18 21:10
Message generated for change (Settings changed) made by dkf
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Category: 41. Photo Images
>Group: obsolete: 8.4.5
Status: Open
Resolution: None
>Priority: 8
Submitted By: Jasper Taylor (jaspert)
>Assigned to: Donal K. Fellows (dkf)
Summary: Slow processing irregular transparencies

Initial Comment:
If you have a photo image with irregular transparent
patches dotted around it it takes an atrociously long
time to copy. It seems to be exponentially related to
image size. For instance, here it takes about 2.5
minutes of CPU time on my Athlon XP1600 to create this
fairly compact 750x500 image by tiling a small but
holey initial image (attached)...

% info patchlevel
8.4.2
% image create photo p1 -file flip_v.gif
p1
% image create photo p2
p2
% p2 copy p1 -to 0 0 750 500
< 150 second pause occurs here>
%

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