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         if(border)
  43                 drawborder(dpy, b);
  44
  45         if(!text)
  46                 return;
  47
  48         len = strlen(text);
  49         if(len >= sizeof(buf))
  50                 len = sizeof(buf) - 1;
  51         memcpy(buf, text, len);
  52         buf[len] = 0;
  53
  54         h = b->font.ascent + b->font.descent;
  55         y = b->y + (b->h / 2) - (h / 2) + b->font.ascent;
  56         x = b->x + (h / 2);
  57
  58         /* shorten text if necessary */
  59         while(len && (w = textnw(&b->font, buf, len)) > b->w - h)
  60                 buf[--len] = 0;
  61
  62         if(w > b->w)
  63                 return; /* too long */
  64
  65         gcv.foreground = b->fg;
  66         gcv.background = b->bg;
  67         if(b->font.set) {
  68                 XChangeGC(dpy, b->gc, GCForeground | GCBackground, &gcv);
  69                 XmbDrawImageString(dpy, b->drawable, b->font.set, b->gc,
  70                                 x, y, buf, len);
  71         }
  72         else {
  73                 gcv.font = b->font.xfont->fid;
  74                 XChangeGC(dpy, b->gc, GCForeground | GCBackground | GCFont, &gcv);
  75                 XDrawImageString(dpy, b->drawable, b->gc, x, y, buf, len);
  76         }
  77 }
  78
  79 static unsigned long
  80 xloadcolors(Display *dpy, Colormap cmap, const char *colstr)
  81 {
  82         XColor color;
  83         XAllocNamedColor(dpy, cmap, colstr, &color, &color);
  84         return color.pixel;
  85 }
  86
  87 void
  88 loadcolors(Display *dpy, int screen, Brush *b,
  89                 const char *bg, const char *fg, const char *border)
  90 {
  91         Colormap cmap = DefaultColormap(dpy, screen);
  92         b->bg = xloadcolors(dpy, cmap, bg);
  93         b->fg = xloadcolors(dpy, cmap, fg);
  94         b->border = xloadcolors(dpy, cmap, border);
  95 }
  96
  97 unsigned int
  98 textnw(Fnt *font, char *text, unsigned int len)
  99 {
 100         XRectangle r;
 101         if(font->set) {
 102                 XmbTextExtents(font->set, text, len, NULL, &r);
 103                 return r.width;
 104         }
 105         return XTextWidth(font->xfont, text, len);
 106 }
 107
 108 unsigned int
 109 textw(Fnt *font, char *text)
 110 {
 111         return textnw(font, text, strlen(text));
 112 }
 113
 114 unsigned int
 115 texth(Fnt *font)
 116 {
 117         return font->height + 4;
 118 }
 119
 120 void
 121 loadfont(Display *dpy, Fnt *font, const char *fontstr)
 122 {
 123         char **missing, *def;
 124         int n;
 125
 126         missing = NULL;
 127         def = "?";
 128         setlocale(LC_ALL, "");
 129         if(font->set)
 130                 XFreeFontSet(dpy, font->set);
 131         font->set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 132         if(missing) {
 133                 while(n--)
 134                         fprintf(stderr, "missing fontset: %s\n", missing[n]);
 135                 XFreeStringList(missing);
 136                 if(font->set) {
 137                         XFreeFontSet(dpy, font->set);
 138                         font->set = NULL;
 139                 }
 140         }
 141         if(font->set) {
 142                 XFontSetExtents *font_extents;
 143                 XFontStruct **xfonts;
 144                 char **font_names;
 145                 unsigned int i;
 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 load 'fixed' font\n");
 167                 font->ascent = font->xfont->ascent;
 168                 font->descent = font->xfont->descent;
 169         }
 170         font->height = font->ascent + font->descent;
 171 }