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

   1 #include "font.h"
   2 #include "color.h"
   3 #include "mask.h"
   4 #include "theme.h"
   5 #include "kernel/geom.h"
   6 #include "kernel/gettext.h"
   7 #define _(str) gettext(str)
   8
   9 #include <X11/Xft/Xft.h>
  10 #include <glib.h>
  11 #include <string.h>
  12
  13 #define ELIPSES "..."
  14 #define ELIPSES_LENGTH(font, shadow, offset) \
  15     (font->elipses_length + (shadow ? offset : 0))
  16
  17 static gboolean started = FALSE;
  18
  19 static void font_startup(void)
  20 {
  21 #ifdef DEBUG
  22     int version;
  23 #endif /* DEBUG */
  24     if (!XftInit(0)) {
  25         g_warning(_("Couldn't initialize Xft.\n"));
  26         exit(3);
  27     }
  28 #ifdef DEBUG
  29     version = XftGetVersion();
  30     g_message("Using Xft %d.%d.%d (Built against %d.%d.%d).",
  31               version / 10000 % 100, version / 100 % 100, version % 100,
  32               XFT_MAJOR, XFT_MINOR, XFT_REVISION);
  33 #endif
  34 }
  35
  36 static void measure_font(RrFont *f)
  37 {
  38     XGlyphInfo info;
  39
  40     /* measure an elipses */
  41     XftTextExtentsUtf8(RrDisplay(f->inst), f->xftfont,
  42                        (FcChar8*)ELIPSES, strlen(ELIPSES), &info);
  43     f->elipses_length = (signed) info.xOff;
  44 }
  45
  46 RrFont *RrFontOpen(const RrInstance *inst, char *fontstring)
  47 {
  48     RrFont *out;
  49     XftFont *xf;
  50
  51     if (!started) {
  52         font_startup();
  53         started = TRUE;
  54     }
  55
  56     if ((xf = XftFontOpenName(RrDisplay(inst), RrScreen(inst), fontstring))) {
  57         out = g_new(RrFont, 1);
  58         out->inst = inst;
  59         out->xftfont = xf;
  60         measure_font(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(RrDisplay(inst), RrScreen(inst), "sans"))) {
  67         out = g_new(RrFont, 1);
  68         out->inst = inst;
  69         out->xftfont = xf;
  70         measure_font(out);
  71         return out;
  72     }
  73     g_warning(_("Unable to load font: %s\n"), "sans");
  74     g_warning(_("Aborting!.\n"));
  75
  76     exit(3); /* can't continue without a font */
  77 }
  78
  79 void RrFontClose(RrFont *f)
  80 {
  81     if (f) {
  82         XftFontClose(RrDisplay(f->inst), f->xftfont);
  83         g_free(f);
  84     }
  85 }
  86
  87 static void font_measure_full(const RrFont *f, const gchar *str,
  88                               gint shadow, gint offset, gint *x, gint *y)
  89 {
  90     XGlyphInfo info;
  91
  92     XftTextExtentsUtf8(RrDisplay(f->inst), f->xftfont,
  93                        (const FcChar8*)str, strlen(str), &info);
  94
  95     *x = (signed) info.xOff + (shadow ? ABS(offset) : 0);
  96     *y = info.height + (shadow ? ABS(offset) : 0);
  97 }
  98
  99 int RrFontMeasureString(const RrFont *f, const gchar *str,
 100                         gint shadow, gint offset)
 101 {
 102     gint x, y;
 103     font_measure_full (f, str, shadow, offset, &x, &y);
 104     return x;
 105 }
 106
 107 int RrFontHeight(const RrFont *f, gint shadow, gint offset)
 108 {
 109     return f->xftfont->ascent + f->xftfont->descent + (shadow ? offset : 0);
 110 }
 111
 112 int RrFontMaxCharWidth(const RrFont *f)
 113 {
 114     return (signed) f->xftfont->max_advance_width;
 115 }
 116
 117 void RrFontDraw(XftDraw *d, RrTextureText *t, Rect *area)
 118 {
 119     gint x,y,w,h;
 120     XftColor c;
 121     GString *text;
 122     gint mw, em, mh;
 123     size_t l;
 124     gboolean shortened = FALSE;
 125
 126     /* center vertically */
 127     y = area->y +
 128         (area->height - RrFontHeight(t->font, t->shadow, t->offset)) / 2;
 129     w = area->width;
 130     h = area->height;
 131
 132     text = g_string_new(t->string);
 133     l = g_utf8_strlen(text->str, -1);
 134     font_measure_full(t->font, text->str, t->shadow, t->offset, &mw, &mh);
 135     while (l && mw > area->width) {
 136         shortened = TRUE;
 137         /* remove a character from the middle */
 138         text = g_string_erase(text, l-- / 2, 1);
 139         em = ELIPSES_LENGTH(t->font, t->shadow, t->offset);
 140         /* if the elipses are too large, don't show them at all */
 141         if (em > area->width)
 142             shortened = FALSE;
 143         font_measure_full(t->font, text->str, t->shadow, t->offset, &mw, &mh);
 144         mw += em;
 145     }
 146     if (shortened) {
 147         text = g_string_insert(text, (l + 1) / 2, ELIPSES);
 148         l += 3;
 149     }
 150     if (!l) return;
 151
 152     switch (t->justify) {
 153     case RR_JUSTIFY_LEFT:
 154         x = area->x;
 155         break;
 156     case RR_JUSTIFY_RIGHT:
 157         x = area->x + (w - mw);
 158         break;
 159     case RR_JUSTIFY_CENTER:
 160         x = area->x + (w - mw) / 2;
 161         break;
 162     }
 163
 164     l = strlen(text->str); /* number of bytes */
 165
 166     if (t->shadow) {
 167         if (t->tint >= 0) {
 168             c.color.red = 0;
 169             c.color.green = 0;
 170             c.color.blue = 0;
 171             c.color.alpha = 0xffff * t->tint / 100; /* transparent shadow */
 172             c.pixel = BlackPixel(RrDisplay(t->font->inst),
 173                                  RrScreen(t->font->inst));
 174         } else {
 175             c.color.red = 0xffff * -t->tint / 100;
 176             c.color.green = 0xffff * -t->tint / 100;
 177             c.color.blue = 0xffff * -t->tint / 100;
 178             c.color.alpha = 0xffff * -t->tint / 100; /* transparent shadow */
 179             c.pixel = WhitePixel(RrDisplay(t->font->inst),
 180                                  RrScreen(t->font->inst));
 181         }
 182         XftDrawStringUtf8(d, &c, t->font->xftfont, x + t->offset,
 183                           t->font->xftfont->ascent + y + t->offset,
 184                           (FcChar8*)text->str, l);
 185     }
 186     c.color.red = t->color->r | t->color->r << 8;
 187     c.color.green = t->color->g | t->color->g << 8;
 188     c.color.blue = t->color->b | t->color->b << 8;
 189     c.color.alpha = 0xff | 0xff << 8; /* fully opaque text */
 190     c.pixel = t->color->pixel;
 191
 192     XftDrawStringUtf8(d, &c, t->font->xftfont, x,
 193                       t->font->xftfont->ascent + y,
 194                       (FcChar8*)text->str, l);
 195     return;
 196 }