dix: force a minimum of 0 for screen coordinates.
Currently the root coordinates may fall into ]-1..0] if the subpixel
remainder is less than 0. Screen coordinates mustn't go below 0, so use
miPointerSetPosition to cap off the remainder if the coordinates are below
0.
This is cheating a bit, a more comprehensive solution to deal with subpixels
correctly when crossing screens is needed. For now, this'll do.
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Acked-by: Simon Thum <simon.thum@gmx.de>
(cherry picked from commit 45f447dafd
)
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parent
3788113618
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@ -781,6 +781,19 @@ positionSprite(DeviceIntPtr dev, int *x, int *y, float x_frac, float y_frac,
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*screeny_frac = dev->last.remainder[1];
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}
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/* Hit the left screen edge? */
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if (*screenx <= 0 && *screenx_frac < 0.0f)
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{
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*screenx_frac = 0.0f;
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x_frac = 0.0f;
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}
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if (*screeny <= 0 && *screeny_frac < 0.0f)
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{
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*screeny_frac = 0.0f;
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y_frac = 0.0f;
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}
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old_screenx = *screenx;
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old_screeny = *screeny;
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/* This takes care of crossing screens for us, as well as clipping
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