[MACTCL] png problem on buttons

[Geoff B. <ge...@mr...>]

Hi,

I have encountered an unusual problem. Using TkImg to display png images 
on widgets, I have found that certain images will not display on 
buttons, despite being displayed correctly on labels. This does not 
occur for all pngs.

Here is some example code to illustrate the problem:

package require Img 1.3
image create photo file16x16 -data 
"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"
image create photo disk16x16 -data 
"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"
label .file_label -image file16x16
label .disk_label -image disk16x16
button .file_button -image file16x16
button .disk_button -image disk16x16
grid .file_label .disk_label
grid .file_button .disk_button

The png image "file16x16" displays correctly on labels and buttons, but 
"disk16x16" only displays on the label, with the button being blank (but 
sized correctly for a 16x16 image). The problem remains when png files 
are used rather than png image data as a string.

This problem occurs under Aqua using tk 8.4.11 with TkImg 1.3. I have 
also reproduced this with tk 8.4.13 (same TkImg installation). On 
another machine with tk 8.4.7 the test script actually causes a 
segmentation fault:

usr/bin/wish8.4: line 2:  3095 Segmentation fault      "$(dirname 
$0)/../../System/Library/Frameworks/Tk.framework/Versions/8.4/Resources/Wish 
Shell.app/Contents/MacOS/Wish Shell" "$@"

The above script displays all images as expected using tk 8.4.11 on 
linux, and using tk 8.4.1 under X11 on Mac Os X.

I'd be interested to hear if anyone else gets the same results, or has 
any suggestions for a workaround. Also, if anyone can identify exactly 
what it is about the disk16x16 png that causes it to fail while 
file16x16 works (I have several other examples of working and failing 
images), then I would love to hear about it!

I posted to comp.lang.tcl but have had no replies saying they also had a 
problem. I had one reply saying it worked fine, but I'm not sure which 
version of tk that was with.
http://groups.google.co.uk/group/comp.lang.tcl/tree/browse_frm/thread/a5194f85d94e0c4e/bcc9dbddb4b9773e?rnum=1&q=png+mac+os+x&_done=%2Fgroup%2Fcomp.lang.tcl%2Fbrowse_frm%2Fthread%2Fa5194f85d94e0c4e%2F8d004bf24fdd0c60%3Fq%3Dpng+mac+os+x%26rnum%3D1%26#doc_bcc9dbddb4b9773e

Thanks in advance for any replies,
Geoff.