1 #include <u.h>
2 #include <libc.h>
3 #include <draw.h>
4 
5 Point
6 Pt(int x, int y)
7 {
8 	Point p;
9 
10 	p.x = x;
11 	p.y = y;
12 	return p;
13 }
14 
15 Rectangle
16 Rect(int x, int y, int bx, int by)
17 {
18 	Rectangle r;
19 
20 	r.min.x = x;
21 	r.min.y = y;
22 	r.max.x = bx;
23 	r.max.y = by;
24 	return r;
25 }
26 
27 Rectangle
28 Rpt(Point min, Point max)
29 {
30 	Rectangle r;
31 
32 	r.min = min;
33 	r.max = max;
34 	return r;
35 }
36 
37 Point
38 addpt(Point a, Point b)
39 {
40 	a.x += b.x;
41 	a.y += b.y;
42 	return a;
43 }
44 
45 Point
46 subpt(Point a, Point b)
47 {
48 	a.x -= b.x;
49 	a.y -= b.y;
50 	return a;
51 }
52 
53 Rectangle
54 insetrect(Rectangle r, int n)
55 {
56 	r.min.x += n;
57 	r.min.y += n;
58 	r.max.x -= n;
59 	r.max.y -= n;
60 	return r;
61 }
62 
63 Point
64 divpt(Point a, int b)
65 {
66 	a.x /= b;
67 	a.y /= b;
68 	return a;
69 }
70 
71 Point
72 mulpt(Point a, int b)
73 {
74 	a.x *= b;
75 	a.y *= b;
76 	return a;
77 }
78 
79 Rectangle
80 rectsubpt(Rectangle r, Point p)
81 {
82 	r.min.x -= p.x;
83 	r.min.y -= p.y;
84 	r.max.x -= p.x;
85 	r.max.y -= p.y;
86 	return r;
87 }
88 
89 Rectangle
90 rectaddpt(Rectangle r, Point p)
91 {
92 	r.min.x += p.x;
93 	r.min.y += p.y;
94 	r.max.x += p.x;
95 	r.max.y += p.y;
96 	return r;
97 }
98 
99 int
100 eqpt(Point p, Point q)
101 {
102 	return p.x==q.x && p.y==q.y;
103 }
104 
105 int
106 eqrect(Rectangle r, Rectangle s)
107 {
108 	return r.min.x==s.min.x && r.max.x==s.max.x &&
109 	       r.min.y==s.min.y && r.max.y==s.max.y;
110 }
111 
112 int
113 rectXrect(Rectangle r, Rectangle s)
114 {
115 	return r.min.x<s.max.x && s.min.x<r.max.x &&
116 	       r.min.y<s.max.y && s.min.y<r.max.y;
117 }
118 
119 int
120 rectinrect(Rectangle r, Rectangle s)
121 {
122 	return s.min.x<=r.min.x && r.max.x<=s.max.x && s.min.y<=r.min.y && r.max.y<=s.max.y;
123 }
124 
125 int
126 ptinrect(Point p, Rectangle r)
127 {
128 	return p.x>=r.min.x && p.x<r.max.x &&
129 	       p.y>=r.min.y && p.y<r.max.y;
130 }
131 
132 Rectangle
133 canonrect(Rectangle r)
134 {
135 	int t;
136 	if (r.max.x < r.min.x) {
137 		t = r.min.x;
138 		r.min.x = r.max.x;
139 		r.max.x = t;
140 	}
141 	if (r.max.y < r.min.y) {
142 		t = r.min.y;
143 		r.min.y = r.max.y;
144 		r.max.y = t;
145 	}
146 	return r;
147 }
148 
149 void
150 combinerect(Rectangle *r1, Rectangle r2)
151 {
152 	if(r1->min.x > r2.min.x)
153 		r1->min.x = r2.min.x;
154 	if(r1->min.y > r2.min.y)
155 		r1->min.y = r2.min.y;
156 	if(r1->max.x < r2.max.x)
157 		r1->max.x = r2.max.x;
158 	if(r1->max.y < r2.max.y)
159 		r1->max.y = r2.max.y;
160 }
161 
162 u32int
163 drawld2chan[] = {
164 	GREY1,
165 	GREY2,
166 	GREY4,
167 	CMAP8,
168 };
169 
170 u32int
171 setalpha(u32int color, uchar alpha)
172 {
173 	int red, green, blue;
174 
175 	red = (color >> 3*8) & 0xFF;
176 	green = (color >> 2*8) & 0xFF;
177 	blue = (color >> 1*8) & 0xFF;
178 	/* ignore incoming alpha */
179 	red = (red * alpha)/255;
180 	green = (green * alpha)/255;
181 	blue = (blue * alpha)/255;
182 	return (red<<3*8) | (green<<2*8) | (blue<<1*8) | (alpha<<0*8);
183 }
184 
185 Point	ZP;
186 Rectangle ZR;
187 int
188 Rfmt(Fmt *f)
189 {
190 	Rectangle r;
191 
192 	r = va_arg(f->args, Rectangle);
193 	return fmtprint(f, "%P %P", r.min, r.max);
194 }
195 
196 int
197 Pfmt(Fmt *f)
198 {
199 	Point p;
200 
201 	p = va_arg(f->args, Point);
202 	return fmtprint(f, "[%d %d]", p.x, p.y);
203 }