Re: issues generating icon - NSImageRep immutable ?

[Riccardo Mottola]

Hi,

Fred Kiefer wrote:
> Sorry, I am completely lost here. Are you referring to line 301 or 351? I think 
> that you expect the code starting in line 351 will be able to update the 
> appIcon. This won’t work in GNUstep. When locking focus on an image we try to 
> draw a representation of the image on an NSCachedImageRep. Your further drawing 
> may also land in that image rep, but that will get overridden again. We may 
> need to copy back changes from the NSCachedImageRep into the actual NSImage.

Line 301 has to go away (to test what I mean, it needs to be commented 
out, so to make GS=Mac).
I refer to th drawing in line 351 (actual drawing is done inside 
draw_value() called at line 369).

Indeed I want to draw into the ImageRep once focus is locked, that's 
what Mac does.

When does it get overridden? when unlocking? Is there away to overcome 
it? e.g. by making a copy of the Image rep before unlocking?


> As far as I remember this requires a complete rewrite of the image handling and 
> would be only possible for a few of the current drawing backends. At least this 
> is what I came up with years ago when I tried for the last time. Maybe it is 
> better if I stay out of this and let you two come up with a better solution.

That sounds bad... but maybe your memories need to be refreshed, perhps 
we can find a way to work around it and maybe optimize it for certain 
backends.

Riccardo