tcolors.c - plan9port - [fork] Plan 9 from user space
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tcolors.c (3206B)
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1 #include <u.h>
2 #include <libc.h>
3 #include <draw.h>
4 #include <event.h>
5
6 int nbit, npix;
7 Image *pixel;
8 Rectangle crect[256];
9
10 Image *color[256];
11
12 void
13 eresized(int new)
14 {
15 int x, y, i, n, nx, ny;
16 Rectangle r, b;
17
18 if(new && getwindow(display, Refnone) < 0){
19 fprint(2, "colors: can't reattach to window: %r\n");
20 exits("resized");
21 }
22 if(screen->depth > 8){
23 n = 256;
24 nx = 16;
25 }else{
26 n = 1<<screen->depth;
27 nx = 1<<(screen->depth/2);
28 }
29
30 ny = n/nx;
31 draw(screen, screen->r, display->white, nil, ZP);
32 r = insetrect(screen->r, 5);
33 r.min.y+=20;
34 b.max.y=r.min.y;
35 for(i=n-1, y=0; y!=ny; y++){
36 b.min.y=b.max.y;
37 b.max.y=r.min.y+(r.max.y-r.min.y)*(y+1)/ny;
38 b.max.x=r.min.x;
39 for(x=0; x!=nx; x++, --i){
40 b.min.x=b.max.x;
41 b.max.x=r.min.x+(r.max.x-r.min.x)*(x+1)/nx;
42 crect[i]=insetrect(b, 1);
43 draw(screen, crect[i], color[i], nil, ZP);
44 }
45 }
46 flushimage(display, 1);
47 }
48
49 char *buttons[] =
50 {
51 "exit",
52 0
53 };
54
55 ulong
56 grey(int i)
57 {
58 if(i < 0)
59 return grey(0);
60 if(i > 255)
61 return grey(255);
62 return (i<<16)+(i<<8)+i;
63 }
64
65 Menu menu =
66 {
67 buttons
68 };
69
70 int
71 dither[16] = {
72 0, 8, 2, 10,
73 12, 4, 14, 6,
74 3, 11, 1, 9,
75 15, 7, 13, 5
76 };
77
78 void
79 main(int argc, char *argv[])
80 {
81 Point p;
82 Mouse m;
83 int i, j, k, l, n, ramp, prev;
84 char buf[100];
85 char *fmt;
86 Image *dark;
87 ulong rgb;
88
89 ramp = 0;
90
91 fmt = "index %3d r %3lud g %3lud b %3lud 0x%.8luX ";
92 ARGBEGIN{
93 default:
94 goto Usage;
95 case 'x':
96 fmt = "index %2luX r %3luX g %3luX b %3luX 0x%.8luX ";
97 break;
98 case 'r':
99 ramp = 1;
100 break;
101 }ARGEND
102
103 if(argc){
104 Usage:
105 fprint(2, "Usage: %s [-rx]\n", argv0);
106 exits("usage");
107 }
108
109 if(initdraw(0, 0, "colors") < 0)
110 sysfatal("initdraw failed: %r");
111 einit(Emouse);
112
113 for(i=0; i<256; i++){
114 if(ramp){
115 if(screen->chan == CMAP8){
116 /* dither the fine grey */
117 j = i-(i%17);
118 dark = allocimage(display, Rect(0,0,1,1), screen->chan, 1, (grey(j)<<8)+0xFF);
119 color[i] = allocimage(display, Rect(0,0,4,4), screen->chan, 1, (grey(j+17)<<8)+0xFF);
120 for(j=0; j<16; j++){
121 k = j%4;
122 l = j/4;
123 if(dither[j] > (i%17))
124 draw(color[i], Rect(k, l, k+1, l+1), dark, nil, ZP);
125 }
126 freeimage(dark);
127 }else
128 color[i] = allocimage(display, Rect(0,0,1,1), screen->chan, 1, (grey(i)<<8)+0xFF);
129 }else
130 color[i] = allocimage(display, Rect(0,0,1,1), screen->chan, 1, (cmap2rgb(i)<<8)+0xFF);
131 if(color[i] == nil)
132 sysfatal("can't allocate image: %r");
133 }
134 eresized(0);
135 prev = -1;
136 for(;;){
137 flushimage(display, 1);
138 m = emouse();
139 switch(m.buttons){
140 case 1:
141 while(m.buttons){
142 if(screen->depth > 8)
143 n = 256;
144 else
145 n = 1<<screen->depth;
146 for(i=0; i!=n; i++)
147 if(i!=prev && ptinrect(m.xy, crect[i])){
148 if(ramp)
149 rgb = grey(i);
150 else
151 rgb = cmap2rgb(i);
152 sprint(buf, fmt,
153 i,
154 (rgb>>16)&0xFF,
155 (rgb>>8)&0xFF,
156 rgb&0xFF,
157 (rgb<<8) | 0xFF);
158 p = addpt(screen->r.min, Pt(2,2));
159 draw(screen, Rpt(p, addpt(p, stringsize(font, buf))), display->white, nil, p);
160 string(screen, p, display->black, ZP, font, buf);
161 prev=i;
162 break;
163 }
164 m = emouse();
165 }
166 break;
167
168 case 4:
169 switch(emenuhit(3, &m, &menu)){
170 case 0:
171 exits(0);
172 }
173 }
174 }
175 }