draw.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <ctype.h>
   3 #include <locale.h>
   4 #include <stdarg.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <string.h>
   8 #include <strings.h>
   9 #include <X11/Xlib.h>
  10 #include "draw.h"
  11
  12 /* macros */
  13 #define MIN(a, b)               ((a) < (b) ? (a) : (b))
  14 #define MAX(a, b)               ((a) > (b) ? (a) : (b))
  15
  16 /* variables */
  17 char *progname;
  18
  19 void
  20 drawcleanup(void) {
  21         if(dc.font.set)
  22                 XFreeFontSet(dpy, dc.font.set);
  23         else
  24                 XFreeFont(dpy, dc.font.xfont);
  25         XFreePixmap(dpy, dc.drawable);
  26         XFreeGC(dpy, dc.gc);
  27 }
  28
  29 void
  30 drawsetup(void) {
  31         /* style */
  32         dc.norm[ColBG] = getcolor(normbgcolor);
  33         dc.norm[ColFG] = getcolor(normfgcolor);
  34         dc.sel[ColBG] = getcolor(selbgcolor);
  35         dc.sel[ColFG] = getcolor(selfgcolor);
  36
  37         /* pixmap */
  38         dc.drawable = XCreatePixmap(dpy, parent, mw, mh, DefaultDepth(dpy, screen));
  39         dc.gc = XCreateGC(dpy, parent, 0, NULL);
  40         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
  41         if(!dc.font.set)
  42                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
  43 }
  44
  45 void
  46 drawtext(const char *text, unsigned long col[ColLast]) {
  47         char buf[256];
  48         int i, x, y, h, len, olen;
  49         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
  50
  51         XSetForeground(dpy, dc.gc, col[ColBG]);
  52         XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
  53         if(!text)
  54                 return;
  55         olen = strlen(text);
  56         h = dc.font.height;
  57         y = dc.y + ((h+2) / 2) - (h / 2) + dc.font.ascent;
  58         x = dc.x + (h / 2);
  59         /* shorten text if necessary */
  60         for(len = MIN(olen, sizeof buf); len && textnw(text, len) > dc.w - h; len--);
  61         if(!len)
  62                 return;
  63         memcpy(buf, text, len);
  64         if(len < olen)
  65                 for(i = len; i && i > len - 3; buf[--i] = '.');
  66         XSetForeground(dpy, dc.gc, col[ColFG]);
  67         if(dc.font.set)
  68                 XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
  69         else
  70                 XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
  71 }
  72
  73 void
  74 eprint(const char *errstr, ...) {
  75         va_list ap;
  76
  77         fprintf(stderr, "%s: ", progname);
  78         va_start(ap, errstr);
  79         vfprintf(stderr, errstr, ap);
  80         va_end(ap);
  81         exit(EXIT_FAILURE);
  82 }
  83
  84 unsigned long
  85 getcolor(const char *colstr) {
  86         Colormap cmap = DefaultColormap(dpy, screen);
  87         XColor color;
  88
  89         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
  90                 eprint("cannot allocate color '%s'\n", colstr);
  91         return color.pixel;
  92 }
  93
  94 void
  95 initfont(const char *fontstr) {
  96         char *def, **missing = NULL;
  97         int i, n;
  98
  99         if(!fontstr || !*fontstr)
 100                 eprint("cannot load null font\n");
 101         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 102         if(missing)
 103                 XFreeStringList(missing);
 104         if(dc.font.set) {
 105                 XFontStruct **xfonts;
 106                 char **font_names;
 107                 dc.font.ascent = dc.font.descent = 0;
 108                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
 109                 for(i = 0; i < n; i++) {
 110                         dc.font.ascent = MAX(dc.font.ascent, (*xfonts)->ascent);
 111                         dc.font.descent = MAX(dc.font.descent, (*xfonts)->descent);
 112                         xfonts++;
 113                 }
 114         }
 115         else {
 116                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
 117                 && !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
 118                         eprint("cannot load font '%s'\n", fontstr);
 119                 dc.font.ascent = dc.font.xfont->ascent;
 120                 dc.font.descent = dc.font.xfont->descent;
 121         }
 122         dc.font.height = dc.font.ascent + dc.font.descent;
 123 }
 124
 125 int
 126 textnw(const char *text, unsigned int len) {
 127         XRectangle r;
 128
 129         if(dc.font.set) {
 130                 XmbTextExtents(dc.font.set, text, len, NULL, &r);
 131                 return r.width;
 132         }
 133         return XTextWidth(dc.font.xfont, text, len);
 134 }
 135
 136 int
 137 textw(const char *text) {
 138         return textnw(text, strlen(text)) + dc.font.height;
 139 }