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(Brush *b)
  15 {
  16         XPoint points[5];
  17         XSetLineAttributes(dpy, b->gc, 1, LineSolid, CapButt, JoinMiter);
  18         XSetForeground(dpy, b->gc, b->border);
  19         points[0].x = b->x;
  20         points[0].y = b->y;
  21         points[1].x = b->w - 1;
  22         points[1].y = 0;
  23         points[2].x = 0;
  24         points[2].y = b->h - 1;
  25         points[3].x = -(b->w - 1);
  26         points[3].y = 0;
  27         points[4].x = 0;
  28         points[4].y = -(b->h - 1);
  29         XDrawLines(dpy, b->drawable, b->gc, points, 5, CoordModePrevious);
  30 }
  31
  32 void
  33 draw(Brush *b, 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 = { b->x, b->y, b->w, b->h };
  40
  41         XSetForeground(dpy, b->gc, b->bg);
  42         XFillRectangles(dpy, b->drawable, b->gc, &r, 1);
  43
  44         w = 0;
  45         if(border)
  46                 drawborder(b);
  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 = b->font.ascent + b->font.descent;
  58         y = b->y + (b->h / 2) - (h / 2) + b->font.ascent;
  59         x = b->x + (h / 2);
  60
  61         /* shorten text if necessary */
  62         while(len && (w = textnw(&b->font, buf, len)) > b->w - h)
  63                 buf[--len] = 0;
  64
  65         if(w > b->w)
  66                 return; /* too long */
  67
  68         gcv.foreground = b->fg;
  69         gcv.background = b->bg;
  70         if(b->font.set) {
  71                 XChangeGC(dpy, b->gc, GCForeground | GCBackground, &gcv);
  72                 XmbDrawImageString(dpy, b->drawable, b->font.set, b->gc,
  73                                 x, y, buf, len);
  74         }
  75         else {
  76                 gcv.font = b->font.xfont->fid;
  77                 XChangeGC(dpy, b->gc, GCForeground | GCBackground | GCFont, &gcv);
  78                 XDrawImageString(dpy, b->drawable, b->gc, x, y, buf, len);
  79         }
  80 }
  81
  82 static unsigned long
  83 xloadcolors(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 loadcolors(int scr, Brush *b,
  92                 const char *bg, const char *fg, const char *border)
  93 {
  94         Colormap cmap = DefaultColormap(dpy, scr);
  95         b->bg = xloadcolors(cmap, bg);
  96         b->fg = xloadcolors(cmap, fg);
  97         b->border = xloadcolors(cmap, border);
  98 }
  99
 100 unsigned int
 101 textnw(Fnt *font, char *text, unsigned int len)
 102 {
 103         XRectangle r;
 104         if(font->set) {
 105                 XmbTextExtents(font->set, text, len, NULL, &r);
 106                 return r.width;
 107         }
 108         return XTextWidth(font->xfont, text, len);
 109 }
 110
 111 unsigned int
 112 textw(Fnt *font, char *text)
 113 {
 114         return textnw(font, text, strlen(text));
 115 }
 116
 117 unsigned int
 118 texth(Fnt *font)
 119 {
 120         return font->height + 4;
 121 }
 122
 123 void
 124 loadfont(Fnt *font, const char *fontstr)
 125 {
 126         char **missing, *def;
 127         int i, n;
 128
 129         missing = NULL;
 130         setlocale(LC_ALL, "");
 131         if(font->set)
 132                 XFreeFontSet(dpy, font->set);
 133         font->set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 134         if(missing) {
 135                 while(n--)
 136                         fprintf(stderr, "missing fontset: %s\n", missing[n]);
 137                 XFreeStringList(missing);
 138                 if(font->set) {
 139                         XFreeFontSet(dpy, font->set);
 140                         font->set = NULL;
 141                 }
 142         }
 143         if(font->set) {
 144                 XFontSetExtents *font_extents;
 145                 XFontStruct **xfonts;
 146                 char **font_names;
 147
 148                 font->ascent = font->descent = 0;
 149                 font_extents = XExtentsOfFontSet(font->set);
 150                 n = XFontsOfFontSet(font->set, &xfonts, &font_names);
 151                 for(i = 0, font->ascent = 0, font->descent = 0; i < n; i++) {
 152                         if(font->ascent < (*xfonts)->ascent)
 153                                 font->ascent = (*xfonts)->ascent;
 154                         if(font->descent < (*xfonts)->descent)
 155                                 font->descent = (*xfonts)->descent;
 156                         xfonts++;
 157                 }
 158         }
 159         else {
 160                 if(font->xfont)
 161                         XFreeFont(dpy, font->xfont);
 162                 font->xfont = NULL;
 163                 font->xfont = XLoadQueryFont(dpy, fontstr);
 164                 if (!font->xfont)
 165                         font->xfont = XLoadQueryFont(dpy, "fixed");
 166                 if (!font->xfont)
 167                         error("error, cannot load 'fixed' font\n");
 168                 font->ascent = font->xfont->ascent;
 169                 font->descent = font->xfont->descent;
 170         }
 171         font->height = font->ascent + font->descent;
 172 }