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 const char *progname;
  18
  19 void
  20 cleanupdraw(DC *dc) {
  21         if(dc->font.set)
  22                 XFreeFontSet(dc->dpy, dc->font.set);
  23         else
  24                 XFreeFont(dc->dpy, dc->font.xfont);
  25         XFreePixmap(dc->dpy, dc->drawable);
  26         XFreeGC(dc->dpy, dc->gc);
  27 }
  28
  29 void
  30 setupdraw(DC *dc, Window w) {
  31         XWindowAttributes wa;
  32
  33         XGetWindowAttributes(dc->dpy, w, &wa);
  34         dc->drawable = XCreatePixmap(dc->dpy, w, wa.width, wa.height,
  35                 DefaultDepth(dc->dpy, DefaultScreen(dc->dpy)));
  36         dc->gc = XCreateGC(dc->dpy, w, 0, NULL);
  37         XSetLineAttributes(dc->dpy, dc->gc, 1, LineSolid, CapButt, JoinMiter);
  38         if(!dc->font.set)
  39                 XSetFont(dc->dpy, dc->gc, dc->font.xfont->fid);
  40 }
  41
  42 void
  43 drawtext(DC *dc, 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(dc->dpy, dc->gc, col[ColBG]);
  49         XFillRectangles(dc->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(dc, 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(dc->dpy, dc->gc, col[ColFG]);
  64         if(dc->font.set)
  65                 XmbDrawString(dc->dpy, dc->drawable, dc->font.set, dc->gc, x, y, buf, len);
  66         else
  67                 XDrawString(dc->dpy, dc->drawable, dc->gc, x, y, buf, len);
  68 }
  69
  70 void
  71 eprint(const char *fmt, ...) {
  72         va_list ap;
  73
  74         fprintf(stderr, "%s: ", progname);
  75         va_start(ap, fmt);
  76         vfprintf(stderr, fmt, ap);
  77         va_end(ap);
  78         exit(EXIT_FAILURE);
  79 }
  80
  81 unsigned long
  82 getcolor(DC *dc, const char *colstr) {
  83         Colormap cmap = DefaultColormap(dc->dpy, DefaultScreen(dc->dpy));
  84         XColor color;
  85
  86         if(!XAllocNamedColor(dc->dpy, cmap, colstr, &color, &color))
  87                 eprint("cannot allocate color '%s'\n", colstr);
  88         return color.pixel;
  89 }
  90
  91 void
  92 initfont(DC *dc, const char *fontstr) {
  93         char *def, **missing = NULL;
  94         int i, n;
  95
  96         if(!fontstr || !*fontstr)
  97                 eprint("cannot load null font\n");
  98         dc->font.set = XCreateFontSet(dc->dpy, fontstr, &missing, &n, &def);
  99         if(missing)
 100                 XFreeStringList(missing);
 101         if(dc->font.set) {
 102                 XFontStruct **xfonts;
 103                 char **font_names;
 104                 dc->font.ascent = dc->font.descent = 0;
 105                 n = XFontsOfFontSet(dc->font.set, &xfonts, &font_names);
 106                 for(i = 0; i < n; i++) {
 107                         dc->font.ascent = MAX(dc->font.ascent, (*xfonts)->ascent);
 108                         dc->font.descent = MAX(dc->font.descent, (*xfonts)->descent);
 109                         xfonts++;
 110                 }
 111         }
 112         else {
 113                 if(!(dc->font.xfont = XLoadQueryFont(dc->dpy, fontstr))
 114                 && !(dc->font.xfont = XLoadQueryFont(dc->dpy, "fixed")))
 115                         eprint("cannot load font '%s'\n", fontstr);
 116                 dc->font.ascent = dc->font.xfont->ascent;
 117                 dc->font.descent = dc->font.xfont->descent;
 118         }
 119         dc->font.height = dc->font.ascent + dc->font.descent;
 120 }
 121
 122 int
 123 textnw(DC *dc, const char *text, unsigned int len) {
 124         XRectangle r;
 125
 126         if(dc->font.set) {
 127                 XmbTextExtents(dc->font.set, text, len, NULL, &r);
 128                 return r.width;
 129         }
 130         return XTextWidth(dc->font.xfont, text, len);
 131 }
 132
 133 int
 134 textw(DC *dc, const char *text) {
 135         return textnw(dc, text, strlen(text)) + dc->font.height;
 136 }