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rootston: damage tracking for rotated views

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emersion 2018-01-27 10:43:17 +01:00
parent a011a1cb07
commit 7111dd79ef
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GPG key ID: 0FDE7BE0E88F5E48
6 changed files with 74 additions and 13 deletions
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29
types/wlr_box.c
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@ -114,3 +114,32 @@ void wlr_box_transform(const struct wlr_box *box,
break;
}
}
void wlr_box_rotated_bounds(const struct wlr_box *box, float rotation,
struct wlr_box *dest) {
if (rotation == 0) {
*dest = *box;
return;
}
double ox = box->x + (double)box->width/2;
double oy = box->y + (double)box->height/2;
double c = fabs(cos(rotation));
double s = fabs(sin(rotation));
double x1 = ox + (box->x - ox) * c + (box->y - oy) * s;
double x2 = ox +
(box->x + box->width - ox) * c +
(box->y + box->height - oy) * s;
double y1 = oy + (box->x - ox) * s + (box->y - oy) * c;
double y2 = oy +
(box->x + box->width - ox) * s +
(box->y + box->height - oy) * c;
dest->x = fmin(x1, x2);
dest->width = fmax(x1, x2) - fmin(x1, x2);
dest->y = fmin(y1, y2);
dest->height = fmax(y1, y2) - fmin(y1, y2);
}