1 #include <u.h>
2 #include <libc.h>
3 #include <draw.h>
4 #include <cursor.h>
5 #include <event.h>
6 
7 #define	W	Borderwidth
8 
9 static Image *tmp[4];
10 static Image *red;
11 
12 static Cursor sweep={
13 	{-7, -7},
14 	{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xE0, 0x07,
15 	 0xE0, 0x07, 0xE0, 0x07, 0xE3, 0xF7, 0xE3, 0xF7,
16 	 0xE3, 0xE7, 0xE3, 0xF7, 0xE3, 0xFF, 0xE3, 0x7F,
17 	 0xE0, 0x3F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,},
18 	{0x00, 0x00, 0x7F, 0xFE, 0x40, 0x02, 0x40, 0x02,
19 	 0x40, 0x02, 0x40, 0x02, 0x40, 0x02, 0x41, 0xE2,
20 	 0x41, 0xC2, 0x41, 0xE2, 0x41, 0x72, 0x40, 0x38,
21 	 0x40, 0x1C, 0x40, 0x0E, 0x7F, 0xE6, 0x00, 0x00,}
22 };
23 
24 static
25 void
26 brects(Rectangle r, Rectangle rp[4])
27 {
28 	if(Dx(r) < 2*W)
29 		r.max.x = r.min.x+2*W;
30 	if(Dy(r) < 2*W)
31 		r.max.y = r.min.y+2*W;
32 	rp[0] = Rect(r.min.x, r.min.y, r.max.x, r.min.y+W);
33 	rp[1] = Rect(r.min.x, r.max.y-W, r.max.x, r.max.y);
34 	rp[2] = Rect(r.min.x, r.min.y+W, r.min.x+W, r.max.y-W);
35 	rp[3] = Rect(r.max.x-W, r.min.y+W, r.max.x, r.max.y-W);
36 }
37 
38 Rectangle
39 egetrect(int but, Mouse *m)
40 {
41 	Rectangle r, rc;
42 
43 	but = 1<<(but-1);
44 	esetcursor(&sweep);
45 	while(m->buttons)
46 		*m = emouse();
47 	while(!(m->buttons & but)){
48 		*m = emouse();
49 		if(m->buttons & (7^but))
50 			goto Return;
51 	}
52 	r.min = m->xy;
53 	r.max = m->xy;
54 	do{
55 		rc = canonrect(r);
56 		edrawgetrect(rc, 1);
57 		*m = emouse();
58 		edrawgetrect(rc, 0);
59 		r.max = m->xy;
60 	}while(m->buttons == but);
61 
62     Return:
63 	esetcursor(0);
64 	if(m->buttons & (7^but)){
65 		rc.min.x = rc.max.x = 0;
66 		rc.min.y = rc.max.y = 0;
67 		while(m->buttons)
68 			*m = emouse();
69 	}
70 	return rc;
71 }
72 
73 static
74 void
75 freetmp(void)
76 {
77 	freeimage(tmp[0]);
78 	freeimage(tmp[1]);
79 	freeimage(tmp[2]);
80 	freeimage(tmp[3]);
81 	freeimage(red);
82 	tmp[0] = tmp[1] = tmp[2] = tmp[3] = red = nil;
83 }
84 
85 void
86 edrawgetrect(Rectangle rc, int up)
87 {
88 	int i;
89 	Rectangle r, rects[4];
90 
91 	if(up && tmp[0]!=nil)
92 		if(Dx(tmp[0]->r)<Dx(rc) || Dy(tmp[2]->r)<Dy(rc))
93 			freetmp();
94 
95 	if(tmp[0] == 0){
96 		r = Rect(0, 0, Dx(screen->r), W);
97 		tmp[0] = allocimage(display, r, screen->chan, 0, -1);
98 		tmp[1] = allocimage(display, r, screen->chan, 0, -1);
99 		r = Rect(0, 0, W, Dy(screen->r));
100 		tmp[2] = allocimage(display, r, screen->chan, 0, -1);
101 		tmp[3] = allocimage(display, r, screen->chan, 0, -1);
102 		red = allocimage(display, Rect(0,0,1,1), screen->chan, 1, DRed);
103 		if(tmp[0]==0 || tmp[1]==0 || tmp[2]==0 || tmp[3]==0 || red==0)
104 			drawerror(display, "getrect: allocimage failed");
105 	}
106 	brects(rc, rects);
107 	if(!up){
108 		for(i=0; i<4; i++)
109 			draw(screen, rects[i], tmp[i], nil, ZP);
110 		return;
111 	}
112 	for(i=0; i<4; i++){
113 		draw(tmp[i], Rect(0, 0, Dx(rects[i]), Dy(rects[i])), screen, nil, rects[i].min);
114 		draw(screen, rects[i], red, nil, ZP);
115 	}
116 }