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x11: Return the exact pixel coverage in get_frame_extents

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Rather than just rounding down the position *and* the size separately
we correctly calculate a rectangle in scaled window coords that fully
covers the real window size. This really only makes a difference
when the window size/position isn't a multiple of the window scale.

https://bugzilla.gnome.org/show_bug.cgi?id=739750
This commit is contained in:
Alexander Larsson 2014-11-20 10:42:55 +01:00
parent bd643e0e1a
commit 788478dff9
1 changed files with 8 additions and 4 deletions
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12
gdk/x11/gdkwindow-x11.c
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@ -3262,10 +3262,14 @@ gdk_x11_window_get_frame_extents (GdkWindow *window,
if (vroots)
XFree (vroots);
rect->x /= impl->window_scale;
rect->y /= impl->window_scale;
rect->width /= impl->window_scale;
rect->height /= impl->window_scale;
/* Here we extend the size to include the extra pixels if we round x/y down
as well as round the size up when we divide by scale so that the returned
size is guaranteed to cover the real pixels, but it may overshoot a bit
in case the window is not positioned/sized according to the scale */
rect->width = (rect->width + rect->x % impl->window_scale + impl->window_scale - 1) / impl->window_scale;
rect->height = (rect->height + rect->y % impl->window_scale + impl->window_scale - 1) / impl->window_scale;
rect->x = rect->x / impl->window_scale;
rect->y = rect->y / impl->window_scale;
gdk_x11_display_error_trap_pop_ignored (display);
}