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