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wlr_output_layout_get_box: handle empty layout

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If there were no outputs in the output layout,
wlr_output_layout_get_box would return the box:

{
  .x = INT_MIN,
  .y = INT_MIN,
  .width = INT_MIN - INT_MAX,
  .height = INT_MIN - INT_MAX
}

which results in an integer underflow for both the width and height.

This changes the logic to have the box be all zeroes, since an empty
output layout does not have a width or height and the location of
something without a size is irrelevant so this just uses the origin.
This commit is contained in:
Brian Ashworth 2019-03-08 01:30:51 -05:00 committed by emersion
parent 2baad6eba6
commit aa5c369910
1 changed files with 18 additions and 16 deletions
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34
types/wlr_output_layout.c
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@ -380,22 +380,24 @@ struct wlr_box *wlr_output_layout_get_box(
}
} else {
// layout extents
int min_x = INT_MAX, min_y = INT_MAX;
int max_x = INT_MIN, max_y = INT_MIN;
wl_list_for_each(l_output, &layout->outputs, link) {
struct wlr_box *box = output_layout_output_get_box(l_output);
if (box->x < min_x) {
min_x = box->x;
}
if (box->y < min_y) {
min_y = box->y;
}
if (box->x + box->width > max_x) {
max_x = box->x + box->width;
}
if (box->y + box->height > max_y) {
max_y = box->y + box->height;
int min_x = 0, max_x = 0, min_y = 0, max_y = 0;
if (!wl_list_empty(&layout->outputs)) {
min_x = min_y = INT_MAX;
max_x = max_y = INT_MIN;
wl_list_for_each(l_output, &layout->outputs, link) {
struct wlr_box *box = output_layout_output_get_box(l_output);
if (box->x < min_x) {
min_x = box->x;
}
if (box->y < min_y) {
min_y = box->y;
}
if (box->x + box->width > max_x) {
max_x = box->x + box->width;
}
if (box->y + box->height > max_y) {
max_y = box->y + box->height;
}
}
}