non-opengl backend rendering issues

[totaam]

Issue migrated from trac ticket # 1874

component: client | priority: blocker | resolution: fixed

2018-06-11 17:21:55: antoine created the issue

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Found by testing for #1658 with:

• wayland as vfb
• a patch to return True from check_randr_sizes
• opengl=no

With python2, the rendering is broken, with python3 the client crashes!

[totaam]

2018-06-14 10:49:12: antoine changed status from new to assigned

[totaam]

2018-06-14 10:49:12: antoine commented

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r19645 adds better debug logging.
The problem seems to come from relative vs absolute coordinates: some methods call queue_draw with relative coordinates, others expect it to honour absolute coordinates and repaint the whole window, including the padding area..

[totaam]

2018-06-14 14:40:38: antoine commented

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Large fix in r19647, also fixes the crashes with python3. (looks like cairo / python3 doesn't do enough validation and just crashes... python2 just renders junk?)
queue_draw is part of the GTK API, we should always use absolute window coordinates there.

Other related changesets:

• r19649: mmap fix for python2 cairo backend
• r19645 + r19646 + r19648: debug logging improvements

[totaam]

2018-06-14 14:40:57: antoine changed status from assigned to closed

[totaam]

2018-06-14 14:40:57: antoine set resolution to fixed

[totaam]

2019-08-05 17:24:34: @totaam commented

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r19647 caused a regression: #1339#comment:35.