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
  29 void
  30 drawtext(DC *dc, const char *text, unsigned long col[ColLast]) {
  31         char buf[256];
  32         size_t n, mn;
  33
  34         /* shorten text if necessary */
  35         n = strlen(text);
  36         for(mn = MIN(n, sizeof buf); textnw(dc, text, mn) > dc->w - dc->font.height/2; mn--)
  37                 if(mn == 0)
  38                         return;
  39         memcpy(buf, text, mn);
  40         if(mn < n)
  41                 for(n = MAX(mn-3, 0); n < mn; buf[n++] = '.');
  42
  43         drawrect(dc, 0, 0, dc->w, dc->h, True, BG(dc, col));
  44         drawtextn(dc, buf, mn, col);
  45 }
  46
  47 void
  48 drawtextn(DC *dc, const char *text, size_t n, unsigned long col[ColLast]) {
  49         int x, y;
  50
  51         x = dc->x + dc->font.height/2;
  52         y = dc->y + dc->font.ascent+1;
  53
  54         XSetForeground(dc->dpy, dc->gc, FG(dc, col));
  55         if(dc->font.set)
  56                 XmbDrawString(dc->dpy, dc->canvas, dc->font.set, dc->gc, x, y, text, n);
  57         else {
  58                 XSetFont(dc->dpy, dc->gc, dc->font.xfont->fid);
  59                 XDrawString(dc->dpy, dc->canvas, dc->gc, x, y, text, n);
  60         }
  61 }
  62
  63 void
  64 eprintf(const char *fmt, ...) {
  65         va_list ap;
  66
  67         fprintf(stderr, "%s: ", progname);
  68         va_start(ap, fmt);
  69         vfprintf(stderr, fmt, ap);
  70         va_end(ap);
  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                 weprintf("no locale support\n");
 103         if(!(dc = malloc(sizeof *dc)))
 104                 eprintf("cannot malloc %u bytes\n", 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         dc->font.xfont = NULL;
 111         dc->font.set = NULL;
 112         dc->canvas = None;
 113         return dc;
 114 }
 115
 116 void
 117 initfont(DC *dc, const char *fontstr) {
 118         if(!loadfont(dc, fontstr ? fontstr : DEFFONT)) {
 119                 if(fontstr != NULL)
 120                         weprintf("cannot load font '%s'\n", fontstr);
 121                 if(fontstr == NULL || !loadfont(dc, DEFFONT))
 122                         eprintf("cannot load font '%s'\n", DEFFONT);
 123         }
 124         dc->font.height = dc->font.ascent + dc->font.descent;
 125 }
 126
 127 Bool
 128 loadfont(DC *dc, const char *fontstr) {
 129         char *def, **missing;
 130         int i, n;
 131
 132         if(!*fontstr)
 133                 return False;
 134         if((dc->font.set = XCreateFontSet(dc->dpy, fontstr, &missing, &n, &def))) {
 135                 char **names;
 136                 XFontStruct **xfonts;
 137
 138                 n = XFontsOfFontSet(dc->font.set, &xfonts, &names);
 139                 for(i = dc->font.ascent = dc->font.descent = 0; i < n; i++) {
 140                         dc->font.ascent = MAX(dc->font.ascent, xfonts[i]->ascent);
 141                         dc->font.descent = MAX(dc->font.descent, xfonts[i]->descent);
 142                 }
 143         }
 144         else if((dc->font.xfont = XLoadQueryFont(dc->dpy, fontstr))) {
 145                 dc->font.ascent = dc->font.xfont->ascent;
 146                 dc->font.descent = dc->font.xfont->descent;
 147         }
 148         if(missing)
 149                 XFreeStringList(missing);
 150         return (dc->font.set || dc->font.xfont);
 151 }
 152
 153 void
 154 mapdc(DC *dc, Window win, unsigned int w, unsigned int h) {
 155         XCopyArea(dc->dpy, dc->canvas, win, dc->gc, 0, 0, w, h, 0, 0);
 156 }
 157
 158 void
 159 resizedc(DC *dc, unsigned int w, unsigned int h) {
 160         if(dc->canvas)
 161                 XFreePixmap(dc->dpy, dc->canvas);
 162         dc->canvas = XCreatePixmap(dc->dpy, DefaultRootWindow(dc->dpy), w, h,
 163                                    DefaultDepth(dc->dpy, DefaultScreen(dc->dpy)));
 164         dc->x = dc->y = 0;
 165         dc->w = w;
 166         dc->h = h;
 167         dc->invert = False;
 168 }
 169
 170 int
 171 textnw(DC *dc, const char *text, size_t len) {
 172         if(dc->font.set) {
 173                 XRectangle r;
 174
 175                 XmbTextExtents(dc->font.set, text, len, NULL, &r);
 176                 return r.width;
 177         }
 178         return XTextWidth(dc->font.xfont, text, len);
 179 }
 180
 181 int
 182 textw(DC *dc, const char *text) {
 183         return textnw(dc, text, strlen(text)) + dc->font.height;
 184 }
 185
 186 void
 187 weprintf(const char *fmt, ...) {
 188         va_list ap;
 189
 190         fprintf(stderr, "%s: warning: ", progname);
 191         va_start(ap, fmt);
 192         vfprintf(stderr, fmt, ap);
 193         va_end(ap);
 194 }