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backends/native: Allow infinitely small pointer constraint regions

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The small catch is that MtkRegion (and pixman regions) "optimize away"
0-size rectangles, so a 0-sized region will always be seen as having
a 0,0 origin. We don't want that, so transfer the origin separately from
the region.

While at it, make the Wayland pointer lock use one such 0-size region,
to avoid the 1x1px wiggle room that it currently has (accounting for subpixel
motion).

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3420>
This commit is contained in:
Carlos Garnacho
2023-11-17 18:15:27 +01:00
committed by Robert Mader
parent c931ed0d81
commit 07d24fe502
7 changed files with 47 additions and 15 deletions
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13
src/backends/meta-pointer-constraint.c
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@ -48,6 +48,7 @@ struct _MetaPointerConstraint
{
GObject parent_instance;
MtkRegion *region;
graphene_point_t origin;
double min_edge_distance;
};
@ -81,21 +82,27 @@ meta_pointer_constraint_class_init (MetaPointerConstraintClass *klass)
MetaPointerConstraint *
meta_pointer_constraint_new (const MtkRegion *region,
double min_edge_distance)
meta_pointer_constraint_new (const MtkRegion *region,
graphene_point_t origin,
double min_edge_distance)
{
MetaPointerConstraint *constraint;
constraint = g_object_new (META_TYPE_POINTER_CONSTRAINT, NULL);
constraint->region = mtk_region_copy (region);
constraint->origin = origin;
constraint->min_edge_distance = min_edge_distance;
return constraint;
}
MtkRegion *
meta_pointer_constraint_get_region (MetaPointerConstraint *constraint)
meta_pointer_constraint_get_region (MetaPointerConstraint *constraint,
graphene_point_t *origin)
{
if (origin)
*origin = constraint->origin;
return constraint->region;
}