draw.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <locale.h>
   3 #include <stdarg.h>
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7 #include <X11/Xlib.h>
   8 #include "draw.h"
   9
  10 #define MAX(a, b)  ((a) > (b) ? (a) : (b))
  11 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  12 #define DEFFONT    "fixed"
  13
  14 static Bool loadfont(DC *dc, const char *fontstr);
  15
  16 void
  17 drawrect(DC *dc, int x, int y, unsigned int w, unsigned int h, Bool fill, unsigned long color) {
  18         XRectangle r = { dc->x + x, dc->y + y, w, h };
  19
  20         if(!fill) {
  21                 r.width -= 1;
  22                 r.height -= 1;
  23         }
  24         XSetForeground(dc->dpy, dc->gc, color);
  25         (fill ? XFillRectangles : XDrawRectangles)(dc->dpy, dc->canvas, dc->gc, &r, 1);
  26 }
  27
  28 void
  29 drawtext(DC *dc, const char *text, unsigned long col[ColLast]) {
  30         char buf[BUFSIZ];
  31         size_t mn, n = strlen(text);
  32
  33         /* shorten text if necessary */
  34         for(mn = MIN(n, sizeof buf); textnw(dc, text, mn) + dc->font.height/2 > dc->w; mn--)
  35                 if(mn == 0)
  36                         return;
  37         memcpy(buf, text, mn);
  38         if(mn < n)
  39                 for(n = MAX(mn-3, 0); n < mn; buf[n++] = '.');
  40
  41         drawrect(dc, 0, 0, dc->w, dc->h, True, BG(dc, col));
  42         drawtextn(dc, buf, mn, col);
  43 }
  44
  45 void
  46 drawtextn(DC *dc, const char *text, size_t n, unsigned long col[ColLast]) {
  47         int x = dc->x + dc->font.height/2;
  48         int y = dc->y + dc->font.ascent+1;
  49
  50         XSetForeground(dc->dpy, dc->gc, FG(dc, col));
  51         if(dc->font.set)
  52                 XmbDrawString(dc->dpy, dc->canvas, dc->font.set, dc->gc, x, y, text, n);
  53         else {
  54                 XSetFont(dc->dpy, dc->gc, dc->font.xfont->fid);
  55                 XDrawString(dc->dpy, dc->canvas, dc->gc, x, y, text, n);
  56         }
  57 }
  58
  59 void
  60 eprintf(const char *fmt, ...) {
  61         va_list ap;
  62
  63         va_start(ap, fmt);
  64         vfprintf(stderr, fmt, ap);
  65         va_end(ap);
  66
  67         if(fmt[strlen(fmt)-1] == ':') {
  68                 fputc(' ', stderr);
  69                 perror(NULL);
  70         }
  71         exit(EXIT_FAILURE);
  72 }
  73
  74 void
  75 freedc(DC *dc) {
  76         if(dc->font.set)
  77                 XFreeFontSet(dc->dpy, dc->font.set);
  78         if(dc->font.xfont)
  79                 XFreeFont(dc->dpy, dc->font.xfont);
  80         if(dc->canvas)
  81                 XFreePixmap(dc->dpy, dc->canvas);
  82         XFreeGC(dc->dpy, dc->gc);
  83         XCloseDisplay(dc->dpy);
  84         free(dc);
  85 }
  86
  87 unsigned long
  88 getcolor(DC *dc, const char *colstr) {
  89         Colormap cmap = DefaultColormap(dc->dpy, DefaultScreen(dc->dpy));
  90         XColor color;
  91
  92         if(!XAllocNamedColor(dc->dpy, cmap, colstr, &color, &color))
  93                 eprintf("cannot allocate color '%s'\n", colstr);
  94         return color.pixel;
  95 }
  96
  97 DC *
  98 initdc(void) {
  99         DC *dc;
 100
 101         if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
 102                 fprintf(stderr, "no locale support\n");
 103         if(!(dc = calloc(1, sizeof *dc)))
 104                 eprintf("cannot malloc %u bytes:", sizeof *dc);
 105         if(!(dc->dpy = XOpenDisplay(NULL)))
 106                 eprintf("cannot open display\n");
 107
 108         dc->gc = XCreateGC(dc->dpy, DefaultRootWindow(dc->dpy), 0, NULL);
 109         XSetLineAttributes(dc->dpy, dc->gc, 1, LineSolid, CapButt, JoinMiter);
 110         return dc;
 111 }
 112
 113 void
 114 initfont(DC *dc, const char *fontstr) {
 115         if(!loadfont(dc, fontstr ? fontstr : DEFFONT)) {
 116                 if(fontstr != NULL)
 117                         fprintf(stderr, "cannot load font '%s'\n", fontstr);
 118                 if(fontstr == NULL || !loadfont(dc, DEFFONT))
 119                         eprintf("cannot load font '%s'\n", DEFFONT);
 120         }
 121         dc->font.height = dc->font.ascent + dc->font.descent;
 122 }
 123
 124 Bool
 125 loadfont(DC *dc, const char *fontstr) {
 126         char *def, **missing;
 127         int i, n;
 128
 129         if(!*fontstr)
 130                 return False;
 131         if((dc->font.set = XCreateFontSet(dc->dpy, fontstr, &missing, &n, &def))) {
 132                 char **names;
 133                 XFontStruct **xfonts;
 134
 135                 n = XFontsOfFontSet(dc->font.set, &xfonts, &names);
 136                 for(i = dc->font.ascent = dc->font.descent = 0; i < n; i++) {
 137                         dc->font.ascent = MAX(dc->font.ascent, xfonts[i]->ascent);
 138                         dc->font.descent = MAX(dc->font.descent, xfonts[i]->descent);
 139                 }
 140         }
 141         else if((dc->font.xfont = XLoadQueryFont(dc->dpy, fontstr))) {
 142                 dc->font.ascent = dc->font.xfont->ascent;
 143                 dc->font.descent = dc->font.xfont->descent;
 144         }
 145         if(missing)
 146                 XFreeStringList(missing);
 147         return (dc->font.set || dc->font.xfont);
 148 }
 149
 150 void
 151 mapdc(DC *dc, Window win, unsigned int w, unsigned int h) {
 152         XCopyArea(dc->dpy, dc->canvas, win, dc->gc, 0, 0, w, h, 0, 0);
 153 }
 154
 155 void
 156 resizedc(DC *dc, unsigned int w, unsigned int h) {
 157         if(dc->canvas)
 158                 XFreePixmap(dc->dpy, dc->canvas);
 159
 160         dc->canvas = XCreatePixmap(dc->dpy, DefaultRootWindow(dc->dpy), w, h,
 161                                    DefaultDepth(dc->dpy, DefaultScreen(dc->dpy)));
 162         dc->w = w;
 163         dc->h = h;
 164 }
 165
 166 int
 167 textnw(DC *dc, const char *text, size_t len) {
 168         if(dc->font.set) {
 169                 XRectangle r;
 170
 171                 XmbTextExtents(dc->font.set, text, len, NULL, &r);
 172                 return r.width;
 173         }
 174         return XTextWidth(dc->font.xfont, text, len);
 175 }
 176
 177 int
 178 textw(DC *dc, const char *text) {
 179         return textnw(dc, text, strlen(text)) + dc->font.height;
 180 }