draw.c

   1 /*
   2  * (C)opyright MMIV-MMVI Anselm R. Garbe <garbeam at gmail dot com>
   3  * See LICENSE file for license details.
   4  */
   5
   6 #include <stdio.h>
   7 #include <string.h>
   8
   9 #include <X11/Xlocale.h>
  10
  11 #include "wm.h"
  12
  13 static void
  14 drawborder(void)
  15 {
  16         XPoint points[5];
  17         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
  18         XSetForeground(dpy, dc.gc, dc.border);
  19         points[0].x = dc.x;
  20         points[0].y = dc.y;
  21         points[1].x = dc.w - 1;
  22         points[1].y = 0;
  23         points[2].x = 0;
  24         points[2].y = dc.h - 1;
  25         points[3].x = -(dc.w - 1);
  26         points[3].y = 0;
  27         points[4].x = 0;
  28         points[4].y = -(dc.h - 1);
  29         XDrawLines(dpy, dc.drawable, dc.gc, points, 5, CoordModePrevious);
  30 }
  31
  32 void
  33 draw(Bool border, const char *text)
  34 {
  35         int x, y, w, h;
  36         unsigned int len;
  37         static char buf[256];
  38         XGCValues gcv;
  39         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
  40
  41         XSetForeground(dpy, dc.gc, dc.bg);
  42         XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
  43
  44         w = 0;
  45         if(border)
  46                 drawborder();
  47
  48         if(!text)
  49                 return;
  50
  51         len = strlen(text);
  52         if(len >= sizeof(buf))
  53                 len = sizeof(buf) - 1;
  54         memcpy(buf, text, len);
  55         buf[len] = 0;
  56
  57         h = dc.font.ascent + dc.font.descent;
  58         y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
  59         x = dc.x + (h / 2);
  60
  61         /* shorten text if necessary */
  62         while(len && (w = textnw(&dc.font, buf, len)) > dc.w - h)
  63                 buf[--len] = 0;
  64
  65         if(w > dc.w)
  66                 return; /* too long */
  67
  68         gcv.foreground = dc.fg;
  69         gcv.background = dc.bg;
  70         if(dc.font.set) {
  71                 XChangeGC(dpy, dc.gc, GCForeground | GCBackground, &gcv);
  72                 XmbDrawImageString(dpy, dc.drawable, dc.font.set, dc.gc,
  73                                 x, y, buf, len);
  74         }
  75         else {
  76                 gcv.font = dc.font.xfont->fid;
  77                 XChangeGC(dpy, dc.gc, GCForeground | GCBackground | GCFont, &gcv);
  78                 XDrawImageString(dpy, dc.drawable, dc.gc, x, y, buf, len);
  79         }
  80 }
  81
  82 static unsigned long
  83 xinitcolors(Colormap cmap, const char *colstr)
  84 {
  85         XColor color;
  86         XAllocNamedColor(dpy, cmap, colstr, &color, &color);
  87         return color.pixel;
  88 }
  89
  90 void
  91 initcolors(const char *bg, const char *fg, const char *border)
  92 {
  93         Colormap cmap = DefaultColormap(dpy, screen);
  94         dc.bg = xinitcolors(cmap, bg);
  95         dc.fg = xinitcolors(cmap, fg);
  96         dc.border = xinitcolors(cmap, border);
  97 }
  98
  99 unsigned int
 100 textnw(Fnt *font, char *text, unsigned int len)
 101 {
 102         XRectangle r;
 103         if(font->set) {
 104                 XmbTextExtents(font->set, text, len, NULL, &r);
 105                 return r.width;
 106         }
 107         return XTextWidth(font->xfont, text, len);
 108 }
 109
 110 unsigned int
 111 textw(Fnt *font, char *text)
 112 {
 113         return textnw(font, text, strlen(text));
 114 }
 115
 116 unsigned int
 117 texth(Fnt *font)
 118 {
 119         return font->height + 4;
 120 }
 121
 122 void
 123 initfont(Fnt *font, const char *fontstr)
 124 {
 125         char **missing, *def;
 126         int i, n;
 127
 128         missing = NULL;
 129         setlocale(LC_ALL, "");
 130         if(font->set)
 131                 XFreeFontSet(dpy, font->set);
 132         font->set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 133         if(missing) {
 134                 while(n--)
 135                         fprintf(stderr, "missing fontset: %s\n", missing[n]);
 136                 XFreeStringList(missing);
 137                 if(font->set) {
 138                         XFreeFontSet(dpy, font->set);
 139                         font->set = NULL;
 140                 }
 141         }
 142         if(font->set) {
 143                 XFontSetExtents *font_extents;
 144                 XFontStruct **xfonts;
 145                 char **font_names;
 146
 147                 font->ascent = font->descent = 0;
 148                 font_extents = XExtentsOfFontSet(font->set);
 149                 n = XFontsOfFontSet(font->set, &xfonts, &font_names);
 150                 for(i = 0, font->ascent = 0, font->descent = 0; i < n; i++) {
 151                         if(font->ascent < (*xfonts)->ascent)
 152                                 font->ascent = (*xfonts)->ascent;
 153                         if(font->descent < (*xfonts)->descent)
 154                                 font->descent = (*xfonts)->descent;
 155                         xfonts++;
 156                 }
 157         }
 158         else {
 159                 if(font->xfont)
 160                         XFreeFont(dpy, font->xfont);
 161                 font->xfont = NULL;
 162                 font->xfont = XLoadQueryFont(dpy, fontstr);
 163                 if (!font->xfont)
 164                         font->xfont = XLoadQueryFont(dpy, "fixed");
 165                 if (!font->xfont)
 166                         error("error, cannot init 'fixed' font\n");
 167                 font->ascent = font->xfont->ascent;
 168                 font->descent = font->xfont->descent;
 169         }
 170         font->height = font->ascent + font->descent;
 171 }