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