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

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