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->color.border);
  18         points[0].x = b->rect.x;
  19         points[0].y = b->rect.y;
  20         points[1].x = b->rect.width - 1;
  21         points[1].y = 0;
  22         points[2].x = 0;
  23         points[2].y = b->rect.height - 1;
  24         points[3].x = -(b->rect.width - 1);
  25         points[3].y = 0;
  26         points[4].x = 0;
  27         points[4].y = -(b->rect.height - 1);
  28         XDrawLines(dpy, b->drawable, b->gc, points, 5, CoordModePrevious);
  29 }
  30
  31 void
  32 draw(Display *dpy, Brush *b)
  33 {
  34         unsigned int x, y, w, h, len;
  35         static char buf[256];
  36         XGCValues gcv;
  37
  38         XSetForeground(dpy, b->gc, b->color.bg);
  39         XFillRectangles(dpy, b->drawable, b->gc, &b->rect, 1);
  40
  41         if(b->border)
  42                 drawborder(dpy, b);
  43
  44         if(!b->text)
  45                 return;
  46
  47         len = strlen(b->text);
  48         if(len >= sizeof(buf))
  49                 len = sizeof(buf) - 1;
  50         memcpy(buf, b->text, len);
  51         buf[len] = 0;
  52
  53         h = b->font->ascent + b->font->descent;
  54         y = b->rect.y + (b->rect.height / 2) - (h / 2) + b->font->ascent;
  55         x = b->rect.x + (h / 2);
  56
  57         /* shorten text if necessary */
  58         while(len && (w = textwidth_l(b->font, buf, len)) > b->rect.width - h)
  59                 buf[--len] = 0;
  60
  61         if(w > b->rect.width)
  62                 return; /* too long */
  63
  64         gcv.foreground = b->color.fg;
  65         gcv.background = b->color.bg;
  66         if(b->font->set) {
  67                 XChangeGC(dpy, b->gc, GCForeground | GCBackground, &gcv);
  68                 XmbDrawImageString(dpy, b->drawable, b->font->set, b->gc,
  69                                 x, y, buf, len);
  70         }
  71         else {
  72                 gcv.font = b->font->xfont->fid;
  73                 XChangeGC(dpy, b->gc, GCForeground | GCBackground | GCFont, &gcv);
  74                 XDrawImageString(dpy, b->drawable, b->gc, x, y, buf, len);
  75         }
  76 }
  77
  78 static unsigned long
  79 xloadcolor(Display *dpy, Colormap cmap, const char *colstr)
  80 {
  81         XColor color;
  82         XAllocNamedColor(dpy, cmap, colstr, &color, &color);
  83         return color.pixel;
  84 }
  85
  86 void
  87 loadcolor(Display *dpy, int screen, Color *c,
  88                 const char *bg, const char *fg, const char *border)
  89 {
  90         Colormap cmap = DefaultColormap(dpy, screen);
  91         c->bg = xloadcolor(dpy, cmap, bg);
  92         c->fg = xloadcolor(dpy, cmap, fg);
  93         c->border = xloadcolor(dpy, cmap, border);
  94 }
  95
  96 unsigned int
  97 textwidth_l(Fnt *font, char *text, unsigned int len)
  98 {
  99         if(font->set) {
 100                 XRectangle r;
 101                 XmbTextExtents(font->set, text, len, 0, &r);
 102                 return r.width;
 103         }
 104         return XTextWidth(font->xfont, text, len);
 105 }
 106
 107 unsigned int
 108 textwidth(Fnt *font, char *text)
 109 {
 110         return textwidth_l(font, text, strlen(text));
 111 }
 112
 113 void
 114 loadfont(Display *dpy, Fnt *font, const char *fontstr)
 115 {
 116         char **missing, *def;
 117         int n;
 118
 119         missing = 0;
 120         def = "?";
 121         setlocale(LC_ALL, "");
 122         if(font->set)
 123                 XFreeFontSet(dpy, font->set);
 124         font->set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 125         if(missing) {
 126                 while(n--)
 127                         fprintf(stderr, "missing fontset: %s\n", missing[n]);
 128                 XFreeStringList(missing);
 129                 if(font->set) {
 130                         XFreeFontSet(dpy, font->set);
 131                         font->set = 0;
 132                 }
 133         }
 134         if(font->set) {
 135                 XFontSetExtents *font_extents;
 136                 XFontStruct **xfonts;
 137                 char **font_names;
 138                 unsigned int i;
 139
 140                 font->ascent = font->descent = 0;
 141                 font_extents = XExtentsOfFontSet(font->set);
 142                 n = XFontsOfFontSet(font->set, &xfonts, &font_names);
 143                 for(i = 0, font->ascent = 0, font->descent = 0; i < n; i++) {
 144                         if(font->ascent < (*xfonts)->ascent)
 145                                 font->ascent = (*xfonts)->ascent;
 146                         if(font->descent < (*xfonts)->descent)
 147                                 font->descent = (*xfonts)->descent;
 148                         xfonts++;
 149                 }
 150         }
 151         else {
 152                 if(font->xfont)
 153                         XFreeFont(dpy, font->xfont);
 154                 font->xfont = 0;
 155                 font->xfont = XLoadQueryFont(dpy, fontstr);
 156                 if (!font->xfont)
 157                         font->xfont = XLoadQueryFont(dpy, "fixed");
 158                 if (!font->xfont)
 159                         error("error, cannot load 'fixed' font\n");
 160                 font->ascent = font->xfont->ascent;
 161                 font->descent = font->xfont->descent;
 162         }
 163 }