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lavd/x11grab: fix vertical repositioning

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There is a calculation error in xcbgrab_reposition() that breaks
vertical repositioning on follow_mouse. It made the bottom
reposition occur when moving the mouse lower than N pixels after
the capture bottom edge, instead of before.

This commit fixes the calculation to match the documentation.

follow_mouse: centered or number of pixels. The documentation says:

When it is specified with "centered", the grabbing region follows
the mouse pointer and keeps the pointer at the center of region;
otherwise, the region follows only when the mouse pointer reaches
within PIXELS (greater than zero) to the edge of region.
This commit is contained in:
Octavio Alvarez 2019-03-27 22:52:32 -06:00 committed by Carl Eugen Hoyos
parent 772c73e61f
commit f4f40cbb57
1 changed files with 1 additions and 1 deletions
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libavdevice/xcbgrab.c
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@ -127,7 +127,7 @@ static int xcbgrab_reposition(AVFormatContext *s,
int left = x + f;
int right = x + w - f;
int top = y + f;
int bottom = y + h + f;
int bottom = y + h - f;
if (p_x > right) {
x += p_x - right;
} else if (p_x < left) {