draw.c

   1 /* See LICENSE file for copyright and license details. */
   2
   3 /* enums */
   4 enum { ColFG, ColBG, ColLast };
   5
   6 /* typedefs */
   7 typedef struct {
   8         int x, y, w, h;
   9         unsigned long norm[ColLast];
  10         unsigned long sel[ColLast];
  11         Drawable drawable;
  12         GC gc;
  13         struct {
  14                 XFontStruct *xfont;
  15                 XFontSet set;
  16                 int ascent;
  17                 int descent;
  18                 int height;
  19         } font;
  20 } DC; /* draw context */
  21
  22 /* forward declarations */
  23 static void dccleanup(void);
  24 static void dcsetup(void);
  25 static void drawtext(const char *text, unsigned long col[ColLast]);
  26 static unsigned long getcolor(const char *colstr);
  27 static void initfont(const char *fontstr);
  28 static int textnw(const char *text, unsigned int len);
  29 static int textw(const char *text);
  30
  31 static DC dc;
  32
  33 void
  34 dccleanup(void) {
  35         if(dc.font.set)
  36                 XFreeFontSet(dpy, dc.font.set);
  37         else
  38                 XFreeFont(dpy, dc.font.xfont);
  39         XFreePixmap(dpy, dc.drawable);
  40         XFreeGC(dpy, dc.gc);
  41 }
  42
  43 void
  44 dcsetup(void) {
  45         /* style */
  46         dc.norm[ColBG] = getcolor(normbgcolor);
  47         dc.norm[ColFG] = getcolor(normfgcolor);
  48         dc.sel[ColBG] = getcolor(selbgcolor);
  49         dc.sel[ColFG] = getcolor(selfgcolor);
  50
  51         /* pixmap */
  52         dc.drawable = XCreatePixmap(dpy, parent, mw, mh, DefaultDepth(dpy, screen));
  53         dc.gc = XCreateGC(dpy, parent, 0, NULL);
  54         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
  55         if(!dc.font.set)
  56                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
  57 }
  58
  59 void
  60 drawtext(const char *text, unsigned long col[ColLast]) {
  61         char buf[256];
  62         int i, x, y, h, len, olen;
  63         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
  64
  65         XSetForeground(dpy, dc.gc, col[ColBG]);
  66         XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
  67         if(!text)
  68                 return;
  69         olen = strlen(text);
  70         h = dc.font.height;
  71         y = dc.y + ((h+2) / 2) - (h / 2) + dc.font.ascent;
  72         x = dc.x + (h / 2);
  73         /* shorten text if necessary */
  74         for(len = MIN(olen, sizeof buf); len && textnw(text, len) > dc.w - h; len--);
  75         if(!len)
  76                 return;
  77         memcpy(buf, text, len);
  78         if(len < olen)
  79                 for(i = len; i && i > len - 3; buf[--i] = '.');
  80         XSetForeground(dpy, dc.gc, col[ColFG]);
  81         if(dc.font.set)
  82                 XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
  83         else
  84                 XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
  85 }
  86
  87 unsigned long
  88 getcolor(const char *colstr) {
  89         Colormap cmap = DefaultColormap(dpy, screen);
  90         XColor color;
  91
  92         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
  93                 eprint("drawtext: cannot allocate color '%s'\n", colstr);
  94         return color.pixel;
  95 }
  96
  97 void
  98 initfont(const char *fontstr) {
  99         char *def, **missing = NULL;
 100         int i, n;
 101
 102         if(!fontstr || fontstr[0] == '\0')
 103                 eprint("drawtext: cannot load font: '%s'\n", fontstr);
 104         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 105         if(missing)
 106                 XFreeStringList(missing);
 107         if(dc.font.set) {
 108                 XFontStruct **xfonts;
 109                 char **font_names;
 110                 dc.font.ascent = dc.font.descent = 0;
 111                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
 112                 for(i = 0; i < n; i++) {
 113                         dc.font.ascent = MAX(dc.font.ascent, (*xfonts)->ascent);
 114                         dc.font.descent = MAX(dc.font.descent, (*xfonts)->descent);
 115                         xfonts++;
 116                 }
 117         }
 118         else {
 119                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
 120                 && !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
 121                         eprint("drawtext: cannot load font: '%s'\n", fontstr);
 122                 dc.font.ascent = dc.font.xfont->ascent;
 123                 dc.font.descent = dc.font.xfont->descent;
 124         }
 125         dc.font.height = dc.font.ascent + dc.font.descent;
 126 }
 127
 128 int
 129 textnw(const char *text, unsigned int len) {
 130         XRectangle r;
 131
 132         if(dc.font.set) {
 133                 XmbTextExtents(dc.font.set, text, len, NULL, &r);
 134                 return r.width;
 135         }
 136         return XTextWidth(dc.font.xfont, text, len);
 137 }
 138
 139 int
 140 textw(const char *text) {
 141         return textnw(text, strlen(text)) + dc.font.height;
 142 }