XCopyArea clip bug

Maarten Maathuis madman2003 at gmail.com
Wed Feb 4 09:39:13 PST 2009

On Wed, Feb 4, 2009 at 2:46 PM, Alexander Larsson <alexl at redhat.com> wrote:
> On Wed, 2009-02-04 at 13:38 +0100, Alexander Larsson wrote:
>> I found what I think is a bug in XCopyArea.
>> If you copy a pixmap to a window and some of the copied area is outside
>> the pixmap then that area in the destination window is cleared to the
>> background color (and possibly graphics exposes are sent).
>> If the GC has a clip region set so that the destination area that would
>> contain data from outside the pixmap is clipped out, then I would expect
>> it to not be cleared.
>> However, that is not the case right now, even the clipped out area has
>> the destination cleared to the window background.
>> I'm attaching an xlib example.
> Oh, the same thing happens if the source is another window and not a
> pixmap.
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Would this be the correct result?

If so, then i know the cause of the problem.

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