[bug #27782] drawInRect:fromRect:operation:fraction: doesn't work correctly in a flipped view

[Quentin Mathé]

Follow-up Comment #12, bug #27782 (project gnustep):

Here are the promised example and screenshots.

I just found that NSCopyBits interprets the source rect relative to the view
gstate unlike what I said previously. Not sure why I missed that. I didn't
write any example with NSCopyBits used inside -drawInRect: (as the attached
example does); the previous test code I wrote locked the focus explicitly.

I also found that NSCopyBits doesn't work correctly when the destination is
rotated with my patch. The shift I observed is similar to the one previously
visible for -compositeToPoint: in a rotated destination (see
TestDrawing-without-patch-cairo.png). It could be a special with copyOnSelf I
don't handle well.

(file #20251, file #20252, file #20253)
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Additional Item Attachment:

File name: TestDrawing.tar.gz             Size:26 KB
File name: TestDrawing-without-patch-cairo.png Size:24 KB
File name: TestDrawing-with-patch-cairo.png Size:23 KB


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