draw.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
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
/* See LICENSE file for copyright and license details. */
#include <locale.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <X11/Xlib.h>
#include "draw.h"
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#define DEFFONT "fixed"
static Bool loadfont(DC *dc, const char *fontstr);
void
drawrect(DC *dc, int x, int y, unsigned int w, unsigned int h, Bool fill, unsigned long color) {
XRectangle r = { dc->x + x, dc->y + y, w, h };
if(!fill) {
r.width -= 1;
r.height -= 1;
}
XSetForeground(dc->dpy, dc->gc, color);
(fill ? XFillRectangles : XDrawRectangles)(dc->dpy, dc->canvas, dc->gc, &r, 1);
}
void
drawtext(DC *dc, const char *text, unsigned long col[ColLast]) {
char buf[BUFSIZ];
size_t mn, n = strlen(text);
/* shorten text if necessary */
for(mn = MIN(n, sizeof buf); textnw(dc, text, mn) + dc->font.height/2 > dc->w; mn--)
if(mn == 0)
return;
memcpy(buf, text, mn);
if(mn < n)
for(n = MAX(mn-3, 0); n < mn; buf[n++] = '.');
drawrect(dc, 0, 0, dc->w, dc->h, True, BG(dc, col));
drawtextn(dc, buf, mn, col);
}
void
drawtextn(DC *dc, const char *text, size_t n, unsigned long col[ColLast]) {
int x = dc->x + dc->font.height/2;
int y = dc->y + dc->font.ascent+1;
XSetForeground(dc->dpy, dc->gc, FG(dc, col));
if(dc->font.set)
XmbDrawString(dc->dpy, dc->canvas, dc->font.set, dc->gc, x, y, text, n);
else {
XSetFont(dc->dpy, dc->gc, dc->font.xfont->fid);
XDrawString(dc->dpy, dc->canvas, dc->gc, x, y, text, n);
}
}
void
eprintf(const char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
if(fmt[strlen(fmt)-1] == ':') {
fputc(' ', stderr);
perror(NULL);
}
exit(EXIT_FAILURE);
}
void
freedc(DC *dc) {
if(dc->font.set)
XFreeFontSet(dc->dpy, dc->font.set);
if(dc->font.xfont)
XFreeFont(dc->dpy, dc->font.xfont);
if(dc->canvas)
XFreePixmap(dc->dpy, dc->canvas);
XFreeGC(dc->dpy, dc->gc);
XCloseDisplay(dc->dpy);
free(dc);
}
unsigned long
getcolor(DC *dc, const char *colstr) {
Colormap cmap = DefaultColormap(dc->dpy, DefaultScreen(dc->dpy));
XColor color;
if(!XAllocNamedColor(dc->dpy, cmap, colstr, &color, &color))
eprintf("cannot allocate color '%s'\n", colstr);
return color.pixel;
}
DC *
initdc(void) {
DC *dc;
if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
fprintf(stderr, "no locale support\n");
if(!(dc = calloc(1, sizeof *dc)))
eprintf("cannot malloc %u bytes:", sizeof *dc);
if(!(dc->dpy = XOpenDisplay(NULL)))
eprintf("cannot open display\n");
dc->gc = XCreateGC(dc->dpy, DefaultRootWindow(dc->dpy), 0, NULL);
XSetLineAttributes(dc->dpy, dc->gc, 1, LineSolid, CapButt, JoinMiter);
return dc;
}
void
initfont(DC *dc, const char *fontstr) {
if(!loadfont(dc, fontstr ? fontstr : DEFFONT)) {
if(fontstr != NULL)
fprintf(stderr, "cannot load font '%s'\n", fontstr);
if(fontstr == NULL || !loadfont(dc, DEFFONT))
eprintf("cannot load font '%s'\n", DEFFONT);
}
dc->font.height = dc->font.ascent + dc->font.descent;
}
Bool
loadfont(DC *dc, const char *fontstr) {
char *def, **missing;
int i, n;
if(!*fontstr)
return False;
if((dc->font.set = XCreateFontSet(dc->dpy, fontstr, &missing, &n, &def))) {
char **names;
XFontStruct **xfonts;
n = XFontsOfFontSet(dc->font.set, &xfonts, &names);
for(i = dc->font.ascent = dc->font.descent = 0; i < n; i++) {
dc->font.ascent = MAX(dc->font.ascent, xfonts[i]->ascent);
dc->font.descent = MAX(dc->font.descent, xfonts[i]->descent);
}
}
else if((dc->font.xfont = XLoadQueryFont(dc->dpy, fontstr))) {
dc->font.ascent = dc->font.xfont->ascent;
dc->font.descent = dc->font.xfont->descent;
}
if(missing)
XFreeStringList(missing);
return (dc->font.set || dc->font.xfont);
}
void
mapdc(DC *dc, Window win, unsigned int w, unsigned int h) {
XCopyArea(dc->dpy, dc->canvas, win, dc->gc, 0, 0, w, h, 0, 0);
}
void
resizedc(DC *dc, unsigned int w, unsigned int h) {
if(dc->canvas)
XFreePixmap(dc->dpy, dc->canvas);
dc->canvas = XCreatePixmap(dc->dpy, DefaultRootWindow(dc->dpy), w, h,
DefaultDepth(dc->dpy, DefaultScreen(dc->dpy)));
dc->w = w;
dc->h = h;
}
int
textnw(DC *dc, const char *text, size_t len) {
if(dc->font.set) {
XRectangle r;
XmbTextExtents(dc->font.set, text, len, NULL, &r);
return r.width;
}
return XTextWidth(dc->font.xfont, text, len);
}
int
textw(DC *dc, const char *text) {
return textnw(dc, text, strlen(text)) + dc->font.height;
}