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 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(RrFont *f)
  33 {
  34     XGlyphInfo info;
  35
  36     /* measure an elipses */
  37     XftTextExtentsUtf8(RrDisplay(f->inst), f->xftfont,
  38                        (FcChar8*)ELIPSES, strlen(ELIPSES), &info);
  39     f->elipses_length = (signed) info.xOff;
  40 }
  41
  42 RrFont *font_open(const RrInstance *inst, char *fontstring)
  43 {
  44     RrFont *out;
  45     XftFont *xf;
  46
  47     if ((xf = XftFontOpenName(RrDisplay(inst), RrScreen(inst), fontstring))) {
  48         out = g_new(RrFont, 1);
  49         out->inst = inst;
  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(RrDisplay(inst), RrScreen(inst), "sans"))) {
  58         out = g_new(RrFont, 1);
  59         out->inst = inst;
  60         out->xftfont = xf;
  61         measure_height(out);
  62         return out;
  63     }
  64     g_warning(_("Unable to load font: %s\n"), "sans");
  65     g_warning(_("Aborting!.\n"));
  66
  67     exit(3); /* can't continue without a font */
  68 }
  69
  70 void font_close(RrFont *f)
  71 {
  72     if (f) {
  73         XftFontClose(RrDisplay(f->inst), f->xftfont);
  74         g_free(f);
  75     }
  76 }
  77
  78 void font_measure_full(RrFont *f, char *str, int shadow, int offset,
  79                        int *x, int *y)
  80 {
  81     XGlyphInfo info;
  82
  83     XftTextExtentsUtf8(RrDisplay(f->inst), f->xftfont,
  84                        (FcChar8*)str, strlen(str), &info);
  85
  86     *x = (signed) info.xOff + (shadow ? ABS(offset) : 0);
  87     *y = info.height + (shadow ? ABS(offset) : 0);
  88 }
  89
  90 int font_measure_string(RrFont *f, char *str, int shadow, int offset)
  91 {
  92     int x, y;
  93     font_measure_full (f, str, shadow, offset, &x, &y);
  94     return x;
  95 }
  96
  97 int font_height(RrFont *f, int shadow, int offset)
  98 {
  99     return f->xftfont->ascent + f->xftfont->descent + (shadow ? offset : 0);
 100 }
 101
 102 int font_max_char_width(RrFont *f)
 103 {
 104     return (signed) f->xftfont->max_advance_width;
 105 }
 106
 107 void font_draw(XftDraw *d, RrTextureText *t, Rect *area)
 108 {
 109     int x,y,w,h;
 110     XftColor c;
 111     GString *text;
 112     int mw, em, mh;
 113     size_t l;
 114     gboolean shortened = FALSE;
 115
 116     /* center vertically */
 117     y = area->y +
 118         (area->height - font_height(t->font, t->shadow, t->offset)) / 2;
 119     w = area->width;
 120     h = area->height;
 121
 122     text = g_string_new(t->string);
 123     l = g_utf8_strlen(text->str, -1);
 124     font_measure_full(t->font, text->str, t->shadow, t->offset, &mw, &mh);
 125     while (l && mw > area->width) {
 126         shortened = TRUE;
 127         /* remove a character from the middle */
 128         text = g_string_erase(text, l-- / 2, 1);
 129         em = ELIPSES_LENGTH(t->font, t->shadow, t->offset);
 130         /* if the elipses are too large, don't show them at all */
 131         if (em > area->width)
 132             shortened = FALSE;
 133         font_measure_full(t->font, text->str, t->shadow, t->offset, &mw, &mh);
 134         mw += 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 RR_JUSTIFY_LEFT:
 144         x = area->x;
 145         break;
 146     case RR_JUSTIFY_RIGHT:
 147         x = area->x + (w - mw);
 148         break;
 149     case RR_JUSTIFY_CENTER:
 150         x = area->x + (w - mw) / 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(RrDisplay(t->font->inst),
 163                                  RrScreen(t->font->inst));
 164         } else {
 165             c.color.red = 0xffff * -t->tint / 100;
 166             c.color.green = 0xffff * -t->tint / 100;
 167             c.color.blue = 0xffff * -t->tint / 100;
 168             c.color.alpha = 0xffff * -t->tint / 100; /* transparent shadow */
 169             c.pixel = WhitePixel(RrDisplay(t->font->inst),
 170                                  RrScreen(t->font->inst));
 171         }
 172         XftDrawStringUtf8(d, &c, t->font->xftfont, x + t->offset,
 173                           t->font->xftfont->ascent + y + t->offset,
 174                           (FcChar8*)text->str, l);
 175     }
 176     c.color.red = t->color->r | t->color->r << 8;
 177     c.color.green = t->color->g | t->color->g << 8;
 178     c.color.blue = t->color->b | t->color->b << 8;
 179     c.color.alpha = 0xff | 0xff << 8; /* fully opaque text */
 180     c.pixel = t->color->pixel;
 181
 182     XftDrawStringUtf8(d, &c, t->font->xftfont, x,
 183                       t->font->xftfont->ascent + y,
 184                       (FcChar8*)text->str, l);
 185     return;
 186 }