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scene: fix scaling of negative coordinates

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round() rounds away from zero that can cause unwanted lengthening of
dimensions when sides of box differ in their sign:

scale_length(2, -1, 1.5) == 4 (-1.5 -> -2; 1.5 -> 2)
scale_length(2,  1, 1.5) == 3
This commit is contained in:
zsugabubus 2021-10-28 20:42:12 +02:00
parent a80f2b2816
commit dc9996217b
1 changed files with 3 additions and 3 deletions
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6
types/scene/wlr_scene.c
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@ -364,14 +364,14 @@ static void scene_node_get_size(struct wlr_scene_node *node,
}
static int scale_length(int length, int offset, float scale) {
return round((offset + length) * scale) - round(offset * scale);
return (int)((offset + length) * scale + .5f) - (int)(offset * scale + .5f);
}
static void scale_box(struct wlr_box *box, float scale) {
box->width = scale_length(box->width, box->x, scale);
box->height = scale_length(box->height, box->y, scale);
box->x = round(box->x * scale);
box->y = round(box->y * scale);
box->x = box->x * scale + .5f;
box->y = box->y * scale + .5f;
}
static void _scene_node_damage_whole(struct wlr_scene_node *node,