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 "draw.h"
  10 #include "util.h"
  11
  12 static void
  13 drawborder(Display *dpy, Brush *b)
  14 {
  15         XPoint points[5];
  16         XSetLineAttributes(dpy, b->gc, 1, LineSolid, CapButt, JoinMiter);
  17         XSetForeground(dpy, b->gc, b->border);
  18         points[0].x = b->x;
  19         points[0].y = b->y;
  20         points[1].x = b->w - 1;
  21         points[1].y = 0;
  22         points[2].x = 0;
  23         points[2].y = b->h - 1;
  24         points[3].x = -(b->w - 1);
  25         points[3].y = 0;
  26         points[4].x = 0;
  27         points[4].y = -(b->h - 1);
  28         XDrawLines(dpy, b->drawable, b->gc, points, 5, CoordModePrevious);
  29 }
  30
  31 void
  32 draw(Display *dpy, Brush *b, Bool border, const char *text)
  33 {
  34         unsigned int x, y, w, h, len;
  35         static char buf[256];
  36         XGCValues gcv;
  37         XRectangle r = { b->x, b->y, b->w, b->h };
  38
  39         XSetForeground(dpy, b->gc, b->bg);
  40         XFillRectangles(dpy, b->drawable, b->gc, &r, 1);
  41
  42         w = 0;
  43         if(border)
  44                 drawborder(dpy, b);
  45
  46         if(!text)
  47                 return;
  48
  49         len = strlen(text);
  50         if(len >= sizeof(buf))
  51                 len = sizeof(buf) - 1;
  52         memcpy(buf, text, len);
  53         buf[len] = 0;
  54
  55         h = b->font.ascent + b->font.descent;
  56         y = b->y + (b->h / 2) - (h / 2) + b->font.ascent;
  57         x = b->x + (h / 2);
  58
  59         /* shorten text if necessary */
  60         while(len && (w = textnw(&b->font, buf, len)) > b->w - h)
  61                 buf[--len] = 0;
  62
  63         if(w > b->w)
  64                 return; /* too long */
  65
  66         gcv.foreground = b->fg;
  67         gcv.background = b->bg;
  68         if(b->font.set) {
  69                 XChangeGC(dpy, b->gc, GCForeground | GCBackground, &gcv);
  70                 XmbDrawImageString(dpy, b->drawable, b->font.set, b->gc,
  71                                 x, y, buf, len);
  72         }
  73         else {
  74                 gcv.font = b->font.xfont->fid;
  75                 XChangeGC(dpy, b->gc, GCForeground | GCBackground | GCFont, &gcv);
  76                 XDrawImageString(dpy, b->drawable, b->gc, x, y, buf, len);
  77         }
  78 }
  79
  80 static unsigned long
  81 xloadcolors(Display *dpy, Colormap cmap, const char *colstr)
  82 {
  83         XColor color;
  84         XAllocNamedColor(dpy, cmap, colstr, &color, &color);
  85         return color.pixel;
  86 }
  87
  88 void
  89 loadcolors(Display *dpy, int screen, Brush *b,
  90                 const char *bg, const char *fg, const char *border)
  91 {
  92         Colormap cmap = DefaultColormap(dpy, screen);
  93         b->bg = xloadcolors(dpy, cmap, bg);
  94         b->fg = xloadcolors(dpy, cmap, fg);
  95         b->border = xloadcolors(dpy, cmap, border);
  96 }
  97
  98 unsigned int
  99 textnw(Fnt *font, char *text, unsigned int len)
 100 {
 101         XRectangle r;
 102         if(font->set) {
 103                 XmbTextExtents(font->set, text, len, NULL, &r);
 104                 return r.width;
 105         }
 106         return XTextWidth(font->xfont, text, len);
 107 }
 108
 109 unsigned int
 110 textw(Fnt *font, char *text)
 111 {
 112         return textnw(font, text, strlen(text));
 113 }
 114
 115 unsigned int
 116 texth(Fnt *font)
 117 {
 118         return font->height + 4;
 119 }
 120
 121 void
 122 loadfont(Display *dpy, Fnt *font, const char *fontstr)
 123 {
 124         char **missing, *def;
 125         int n;
 126
 127         missing = NULL;
 128         def = "?";
 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                 unsigned int i;
 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 }