[bug #17923] compositing images in flipped views works intermittently

[Richard Frith-Macdonald]

Update of bug #17923 (project gnustep):

                  Status:                    None => Invalid                
             Open/Closed:                    Open => Closed                 

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Follow-up Comment #1:

I had a look at the code and the results on GNUstep,  concluded that
everything was probably working properly, and ran it (slightly adapted
version) on MacOS-X to make sure.

The reason you only see one image in the flipped view is that it is drawn
with its origin at 0.0 which is the top-left corner of the view.
The composite operation puts the bottom left corner of the image at the
specified point ... so the bottom left corner of the image is at the top left
corner of the view and the image is therefore drawn outside the view and
entirely hidden by the view's clipping.

The reason the other image appears at the same position in both views is that
it is drawn at 64,64 which happens to be half way up the 128*128 view whether
the view is flipped or not.



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