Dogcows Code - chaz/openbox/blob - render/font.c

   1 #include "font.h"
   2 #include "kernel/openbox.h"
   3 #include "kernel/geom.h"
   4 #include "kernel/gettext.h"
   5 #define _(str) gettext(str)
   6
   7 #include <X11/Xft/Xft.h>
   8 #include <glib.h>
   9 #include <string.h>
  10
  11 #define ELIPSES "..."
  12 #define ELIPSES_LENGTH(font, shadow, offset) \
  13     (font->elipses_length + (shadow ? offset : 0))
  14
  15 void font_startup(void)
  16 {
  17 #ifdef DEBUG
  18     int version;
  19 #endif /* DEBUG */
  20     if (!XftInit(0)) {
  21         g_warning(_("Couldn't initialize Xft.\n"));
  22         exit(3);
  23     }
  24 #ifdef DEBUG
  25     version = XftGetVersion();
  26     g_message("Using Xft %d.%d.%d (Built against %d.%d.%d).",
  27               version / 10000 % 100, version / 100 % 100, version % 100,
  28               XFT_MAJOR, XFT_MINOR, XFT_REVISION);
  29 #endif
  30 }
  31
  32 static void measure_height(ObFont *f)
  33 {
  34     XGlyphInfo info;
  35     char *str;
  36
  37     /* XXX add some extended UTF8 characters in here? */
  38     str = "12345678900-qwertyuiopasdfghjklzxcvbnm"
  39         "!@#$%^&*()_+QWERTYUIOPASDFGHJKLZXCVBNM"
  40         "`~[]\\;',./{}|:\"<>?";
  41
  42     XftTextExtentsUtf8(ob_display, f->xftfont,
  43                        (FcChar8*)str, strlen(str), &info);
  44     f->height = (signed) info.height;
  45
  46     /* measure an elipses */
  47     XftTextExtentsUtf8(ob_display, f->xftfont,
  48                        (FcChar8*)ELIPSES, strlen(ELIPSES), &info);
  49     f->elipses_length = (signed) info.xOff;
  50 }
  51
  52 ObFont *font_open(char *fontstring)
  53 {
  54     ObFont *out;
  55     XftFont *xf;
  56
  57     if ((xf = XftFontOpenName(ob_display, ob_screen, fontstring))) {
  58         out = g_new(ObFont, 1);
  59         out->xftfont = xf;
  60         measure_height(out);
  61         return out;
  62     }
  63     g_warning(_("Unable to load font: %s\n"), fontstring);
  64     g_warning(_("Trying fallback font: %s\n"), "sans");
  65
  66     if ((xf = XftFontOpenName(ob_display, ob_screen, "sans"))) {
  67         out = g_new(ObFont, 1);
  68         out->xftfont = xf;
  69         measure_height(out);
  70         return out;
  71     }
  72     g_warning(_("Unable to load font: %s\n"), "sans");
  73     g_warning(_("Aborting!.\n"));
  74
  75     exit(3); /* can't continue without a font */
  76 }
  77
  78 void font_close(ObFont *f)
  79 {
  80     if (f) {
  81         XftFontClose(ob_display, f->xftfont);
  82         g_free(f);
  83     }
  84 }
  85
  86 int font_measure_string(ObFont *f, char *str, int shadow, int offset)
  87 {
  88     XGlyphInfo info;
  89
  90     XftTextExtentsUtf8(ob_display, f->xftfont,
  91                        (FcChar8*)str, strlen(str), &info);
  92
  93     return (signed) info.xOff + (shadow ? offset : 0);
  94 }
  95
  96 int font_height(ObFont *f, int shadow, int offset)
  97 {
  98     return f->height + (shadow ? offset : 0);
  99 }
 100
 101 int font_max_char_width(ObFont *f)
 102 {
 103     return (signed) f->xftfont->max_advance_width;
 104 }
 105
 106 void font_draw(XftDraw *d, TextureText *t, Rect *position)
 107 {
 108     int x,y,w,h;
 109     XftColor c;
 110     GString *text;
 111     int m, em;
 112     size_t l;
 113     gboolean shortened = FALSE;
 114
 115     y = position->y;
 116     w = position->width;
 117     h = position->height;
 118
 119     /* accomidate for areas bigger/smaller than Xft thinks the font is tall */
 120     y -= (2 * (t->font->xftfont->ascent + t->font->xftfont->descent) -
 121           (t->font->height + h) - 1) / 2;
 122
 123     text = g_string_new(t->string);
 124     l = g_utf8_strlen(text->str, -1);
 125     m = font_measure_string(t->font, text->str, t->shadow, t->offset);
 126     while (l && m > position->width) {
 127         shortened = TRUE;
 128         /* remove a character from the middle */
 129         text = g_string_erase(text, l-- / 2, 1);
 130         em = ELIPSES_LENGTH(t->font, t->shadow, t->offset);
 131         /* if the elipses are too large, don't show them at all */
 132         if (em > position->width)
 133             shortened = FALSE;
 134         m = font_measure_string(t->font, text->str, t->shadow, t->offset) + em;
 135     }
 136     if (shortened) {
 137         text = g_string_insert(text, (l + 1) / 2, ELIPSES);
 138         l += 3;
 139     }
 140     if (!l) return;
 141
 142     switch (t->justify) {
 143     case Justify_Left:
 144         x = position->x;
 145         break;
 146     case Justify_Right:
 147         x = position->x + (w - m);
 148         break;
 149     case Justify_Center:
 150         x = position->x + (w - m) / 2;
 151         break;
 152     }
 153
 154     l = strlen(text->str); /* number of bytes */
 155
 156     if (t->shadow) {
 157         if (t->tint >= 0) {
 158             c.color.red = 0;
 159             c.color.green = 0;
 160             c.color.blue = 0;
 161             c.color.alpha = 0xffff * t->tint / 100; /* transparent shadow */
 162             c.pixel = BlackPixel(ob_display, ob_screen);
 163         } else {
 164             c.color.red = 0xffff * -t->tint / 100;
 165             c.color.green = 0xffff * -t->tint / 100;
 166             c.color.blue = 0xffff * -t->tint / 100;
 167             c.color.alpha = 0xffff * -t->tint / 100; /* transparent shadow */
 168             c.pixel = WhitePixel(ob_display, ob_screen);
 169         }
 170         XftDrawStringUtf8(d, &c, t->font->xftfont, x + t->offset,
 171                           t->font->xftfont->ascent + y + t->offset,
 172                           (FcChar8*)text->str, l);
 173     }
 174     c.color.red = t->color->r | t->color->r << 8;
 175     c.color.green = t->color->g | t->color->g << 8;
 176     c.color.blue = t->color->b | t->color->b << 8;
 177     c.color.alpha = 0xff | 0xff << 8; /* fully opaque text */
 178     c.pixel = t->color->pixel;
 179
 180     XftDrawStringUtf8(d, &c, t->font->xftfont, x,
 181                       t->font->xftfont->ascent + y,
 182                       (FcChar8*)text->str, l);
 183     return;
 184 }