forked from emersion/grim
-
Notifications
You must be signed in to change notification settings - Fork 0
/
box.c
57 lines (46 loc) · 1.01 KB
/
box.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
#include <math.h>
#include <stdlib.h>
#include "box.h"
#include <stdio.h>
bool parse_box(struct grim_box *box, const char *str) {
char *end = NULL;
box->x = strtol(str, &end, 10);
if (end[0] != ',') {
return false;
}
char *next = end + 1;
box->y = strtol(next, &end, 10);
if (end[0] != ' ') {
return false;
}
next = end + 1;
box->width = strtol(next, &end, 10);
if (end[0] != 'x') {
return false;
}
next = end + 1;
box->height = strtol(next, &end, 10);
if (end[0] != '\0') {
return false;
}
return true;
}
bool is_empty_box(struct grim_box *box) {
return box->width <= 0 || box->height <= 0;
}
bool intersect_box(struct grim_box *a, struct grim_box *b) {
if (is_empty_box(a) || is_empty_box(b)) {
return false;
}
int x1 = fmax(a->x, b->x);
int y1 = fmax(a->y, b->y);
int x2 = fmin(a->x + a->width, b->x + b->width);
int y2 = fmin(a->y + a->height, b->y + b->height);
struct grim_box box = {
.x = x1,
.y = y1,
.width = x2 - x1,
.height = y2 - y1,
};
return !is_empty_box(&box);
}