Standalone Magnify Problem

[Peter Reid]

I'm following an approach published sometime ago (http://forums.livecode.com/viewtopic.php?f=7&t=8288 <http://forums.livecode.com/viewtopic.php?f=7&t=8288>) to provide a floating magnifier over the top of quite a large image.  I have it working fine when I'm in the development environment but it's not working reliably in a standalone app.  Here's a summary of what I'm doing:

- I generate images of 1,000 x 1,000 pixels, created using the export snapshot facility
- my app lets the user select a magnification factor in the range 4-16 times the original
- I scale-up a copy of the image (making an image of 16,000 x 16,000 say) and magnify this scaled copy
- I present the magnified view through a group using the hScroll/vScroll and formattedHeight/formattedWidth properties

The above works well when in the development environment.  When it's a standalone app I get various incorrect behaviours:

- the magnified view is all white, or all black
- the magnified view is of the wrong part of the image
- it sometimes works in the Mac standalone but not the Windows standalone

I have built the standalone using lc 8.1.2, lc 8.1.3, lc 8.1.4-rc1 and lc 9.0.0-dp6.  In all cases I have tried building using automatic inclusions and manual inclusion selection, but none of this makes it work in the standalone!  For manual selection I tried inluding every option available for Mac & Windows irrespective of whether I needed it or not.  However, even when I include "everything", it still doesn't work in the standalones!

The problems imply the lack of some inclusion and/or memory issues.  Has anyone come across this and, if so do you have a solution?!

Thanks.

Peter
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Peter Reid
Loughborough, UK