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Redraw artefacts #1722

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openstreetmap-trac opened this issue Jul 23, 2021 · 7 comments
Closed

Redraw artefacts #1722

openstreetmap-trac opened this issue Jul 23, 2021 · 7 comments

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@openstreetmap-trac
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Reporter: Simon Arlott
[Submitted to the original trac issue database at 8.31am, Sunday, 19th April 2009]

Merkaartor 0.12 and 0.13.1 are unusable for me as the redraw doesn't work properly. Merkaartor 0.10 still works.

Moving around or zooming causes a ghosting effect, and all or some of the map may have noise over it.

I'm using Linux 2.6.29 with Xorg 1.5.3 and fglrx 8.582.

@openstreetmap-trac
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Author: Simon Arlott
[Added to the original trac issue at 10.41am, Sunday, 19th April 2009]

I can't attach screenshot-sized files...

@openstreetmap-trac
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Author: Simon Arlott
[Added to the original trac issue at 6.06pm, Sunday, 19th April 2009]

If I insert the following into MapView::panScreen before the update() call, the problem goes away:

invalidRegion = QRegion(rect());

If this is a bug outside of Merkaartor relating to partial redraws, perhaps this could be a configuration option (force full redraw)?

@openstreetmap-trac
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Author: Simon Arlott
[Added to the original trac issue at 6.13pm, Sunday, 19th April 2009]

The above fix still has problems with the red grid dots... turning off "show downloaded areas" fixes the unmodified 0.13.1 too.

@openstreetmap-trac
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Author: koying
[Added to the original trac issue at 12.01am, Monday, 20th April 2009]

Could you try adding "NVIDIA_HACK=1" to your qmake, i.e. "qmake -r NVIDIA_HACK=1 ...".

Which Qt version are you using?

@openstreetmap-trac
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Author: Simon Arlott
[Added to the original trac issue at 6.36am, Monday, 20th April 2009]

I'm using Qt 4.5.0. That partially fixes it... but the red dots stay after I download and it breaks when I zoom in far enough: http://s85.org/C5Al1xla.

@openstreetmap-trac
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Author: koying
[Added to the original trac issue at 8.27am, Monday, 20th April 2009]

I'm afraid there is a 99% chance it is a system dependant bug.

Could you try with the "radeon" or "radeonHD" driver for your ATI card?

@openstreetmap-trac
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Author: Koying
[Added to the original trac issue at 1.09pm, Thursday, 30th April 2009]

Solved in 0.13.2

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