[bug #28590] Cairo backend displays wrong colors on X server with a different endianness

[Wolfgang Lux]

Follow-up Comment #4, bug #28590 (project gnustep):

I wrote:
> To make things more weird, windows displayed during drag and drop show the
right colors.

Turns out that things are not weird at all: The dragging window uses
NSBackingStoreNonretained whereas the application windows use
NSBackingStoreBuffered (or maybe NSBackingStoreRetained). If I change the
backing store of the application windows to NSBackingStoreNonretained they
also display correctly, so I guess an unintended byte swap happens either when
writing to the backing store or when sending the backing store image to the
X-server.

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  <http://savannah.gnu.org/bugs/?28590>

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