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box: factor out box_center()

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John Lindgren 2025-11-25 23:25:47 -05:00 • committed by Hiroaki Yamamoto
parent 9f5ff391cc
commit 5ea617a393
3 changed files with 31 additions and 17 deletions
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11
include/common/box.h
View file

@ -10,6 +10,17 @@ bool box_intersects(struct wlr_box *box_a, struct wlr_box *box_b);
void box_union(struct wlr_box *box_dest, struct wlr_box *box_a,
struct wlr_box *box_b);
/*
* Centers a content box (width & height) within a reference box,
* limiting it (if possible) to not extend outside a bounding box.
*
* The reference box and bounding box are often the same but could be
* different (e.g. when centering a view within its parent but limiting
* to usable output area).
*/
void box_center(int width, int height, const struct wlr_box *ref,
const struct wlr_box *bound, int *x, int *y);
/*
* Fits and centers a content box (width & height) within a bounding box.
* The content box is downscaled if necessary (preserving aspect ratio) but

19
src/common/box.c
View file

@ -35,6 +35,25 @@ box_union(struct wlr_box *box_dest, struct wlr_box *box_a, struct wlr_box *box_b
box_dest->height = y2 - y1;
}
void
box_center(int width, int height, const struct wlr_box *ref,
const struct wlr_box *bound, int *x, int *y)
{
*x = ref->x + (ref->width - width) / 2;
*y = ref->y + (ref->height - height) / 2;
if (*x < bound->x) {
*x = bound->x;
} else if (*x + width > bound->x + bound->width) {
*x = bound->x + bound->width - width;
}
if (*y < bound->y) {
*y = bound->y;
} else if (*y + height > bound->y + bound->height) {
*y = bound->y + bound->height - height;
}
}
struct wlr_box
box_fit_within(int width, int height, struct wlr_box *bound)
{

18
src/view.c
View file

@ -816,23 +816,7 @@ view_compute_centered_position(struct view *view, const struct wlr_box *ref,
int height = h + margin.top + margin.bottom;
/* If reference box is NULL then center to usable area */
if (!ref) {
ref = &usable;
}
*x = ref->x + (ref->width - width) / 2;
*y = ref->y + (ref->height - height) / 2;
/* Fit the view within the usable area */
if (*x < usable.x) {
*x = usable.x;
} else if (*x + width > usable.x + usable.width) {
*x = usable.x + usable.width - width;
}
if (*y < usable.y) {
*y = usable.y;
} else if (*y + height > usable.y + usable.height) {
*y = usable.y + usable.height - height;
}
box_center(width, height, ref ? ref : &usable, &usable, x, y);
*x += margin.left;
*y += margin.top;