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

   1 #include "font.h"
   2 #include "theme.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 static gboolean started = FALSE;
  16
  17 static void font_startup(void)
  18 {
  19 #ifdef DEBUG
  20     int version;
  21 #endif /* DEBUG */
  22     if (!XftInit(0)) {
  23         g_warning(_("Couldn't initialize Xft.\n"));
  24         exit(3);
  25     }
  26 #ifdef DEBUG
  27     version = XftGetVersion();
  28     g_message("Using Xft %d.%d.%d (Built against %d.%d.%d).",
  29               version / 10000 % 100, version / 100 % 100, version % 100,
  30               XFT_MAJOR, XFT_MINOR, XFT_REVISION);
  31 #endif
  32 }
  33
  34 static void measure_font(RrFont *f)
  35 {
  36     XGlyphInfo info;
  37
  38     /* measure an elipses */
  39     XftTextExtentsUtf8(RrDisplay(f->inst), f->xftfont,
  40                        (FcChar8*)ELIPSES, strlen(ELIPSES), &info);
  41     f->elipses_length = (signed) info.xOff;
  42 }
  43
  44 RrFont *RrFontOpen(const RrInstance *inst, char *fontstring)
  45 {
  46     RrFont *out;
  47     XftFont *xf;
  48
  49     if (!started) {
  50         font_startup();
  51         started = TRUE;
  52     }
  53
  54     if ((xf = XftFontOpenName(RrDisplay(inst), RrScreen(inst), fontstring))) {
  55         out = g_new(RrFont, 1);
  56         out->inst = inst;
  57         out->xftfont = xf;
  58         measure_font(out);
  59         return out;
  60     }
  61     g_warning(_("Unable to load font: %s\n"), fontstring);
  62     g_warning(_("Trying fallback font: %s\n"), "sans");
  63
  64     if ((xf = XftFontOpenName(RrDisplay(inst), RrScreen(inst), "sans"))) {
  65         out = g_new(RrFont, 1);
  66         out->inst = inst;
  67         out->xftfont = xf;
  68         measure_font(out);
  69         return out;
  70     }
  71     g_warning(_("Unable to load font: %s\n"), "sans");
  72     g_warning(_("Aborting!.\n"));
  73
  74     exit(3); /* can't continue without a font */
  75 }
  76
  77 void RrFontClose(RrFont *f)
  78 {
  79     if (f) {
  80         XftFontClose(RrDisplay(f->inst), f->xftfont);
  81         g_free(f);
  82     }
  83 }
  84
  85 static void font_measure_full(const RrFont *f, const gchar *str,
  86                               gint shadow, gint offset, gint *x, gint *y)
  87 {
  88     XGlyphInfo info;
  89
  90     XftTextExtentsUtf8(RrDisplay(f->inst), f->xftfont,
  91                        (const FcChar8*)str, strlen(str), &info);
  92
  93     *x = (signed) info.xOff + (shadow ? ABS(offset) : 0);
  94     *y = info.height + (shadow ? ABS(offset) : 0);
  95 }
  96
  97 int RrFontMeasureString(const RrFont *f, const gchar *str,
  98                         gint shadow, gint offset)
  99 {
 100     gint x, y;
 101     font_measure_full (f, str, shadow, offset, &x, &y);
 102     return x;
 103 }
 104
 105 int RrFontHeight(const RrFont *f, gint shadow, gint offset)
 106 {
 107     return f->xftfont->ascent + f->xftfont->descent + (shadow ? offset : 0);
 108 }
 109
 110 int RrFontMaxCharWidth(const RrFont *f)
 111 {
 112     return (signed) f->xftfont->max_advance_width;
 113 }
 114
 115 void RrFontDraw(XftDraw *d, RrTextureText *t, Rect *area)
 116 {
 117     gint x,y,w,h;
 118     XftColor c;
 119     GString *text;
 120     gint mw, em, mh;
 121     size_t l;
 122     gboolean shortened = FALSE;
 123
 124     /* center vertically */
 125     y = area->y +
 126         (area->height - RrFontHeight(t->font, t->shadow, t->offset)) / 2;
 127     w = area->width;
 128     h = area->height;
 129
 130     text = g_string_new(t->string);
 131     l = g_utf8_strlen(text->str, -1);
 132     font_measure_full(t->font, text->str, t->shadow, t->offset, &mw, &mh);
 133     while (l && mw > area->width) {
 134         shortened = TRUE;
 135         /* remove a character from the middle */
 136         text = g_string_erase(text, l-- / 2, 1);
 137         em = ELIPSES_LENGTH(t->font, t->shadow, t->offset);
 138         /* if the elipses are too large, don't show them at all */
 139         if (em > area->width)
 140             shortened = FALSE;
 141         font_measure_full(t->font, text->str, t->shadow, t->offset, &mw, &mh);
 142         mw += em;
 143     }
 144     if (shortened) {
 145         text = g_string_insert(text, (l + 1) / 2, ELIPSES);
 146         l += 3;
 147     }
 148     if (!l) return;
 149
 150     switch (t->justify) {
 151     case RR_JUSTIFY_LEFT:
 152         x = area->x;
 153         break;
 154     case RR_JUSTIFY_RIGHT:
 155         x = area->x + (w - mw);
 156         break;
 157     case RR_JUSTIFY_CENTER:
 158         x = area->x + (w - mw) / 2;
 159         break;
 160     }
 161
 162     l = strlen(text->str); /* number of bytes */
 163
 164     if (t->shadow) {
 165         if (t->tint >= 0) {
 166             c.color.red = 0;
 167             c.color.green = 0;
 168             c.color.blue = 0;
 169             c.color.alpha = 0xffff * t->tint / 100; /* transparent shadow */
 170             c.pixel = BlackPixel(RrDisplay(t->font->inst),
 171                                  RrScreen(t->font->inst));
 172         } else {
 173             c.color.red = 0xffff * -t->tint / 100;
 174             c.color.green = 0xffff * -t->tint / 100;
 175             c.color.blue = 0xffff * -t->tint / 100;
 176             c.color.alpha = 0xffff * -t->tint / 100; /* transparent shadow */
 177             c.pixel = WhitePixel(RrDisplay(t->font->inst),
 178                                  RrScreen(t->font->inst));
 179         }
 180         XftDrawStringUtf8(d, &c, t->font->xftfont, x + t->offset,
 181                           t->font->xftfont->ascent + y + t->offset,
 182                           (FcChar8*)text->str, l);
 183     }
 184     c.color.red = t->color->r | t->color->r << 8;
 185     c.color.green = t->color->g | t->color->g << 8;
 186     c.color.blue = t->color->b | t->color->b << 8;
 187     c.color.alpha = 0xff | 0xff << 8; /* fully opaque text */
 188     c.pixel = t->color->pixel;
 189
 190     XftDrawStringUtf8(d, &c, t->font->xftfont, x,
 191                       t->font->xftfont->ascent + y,
 192                       (FcChar8*)text->str, l);
 193     return;
 194 }