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
  36     /* measure an elipses */
  37     XftTextExtentsUtf8(ob_display, f->xftfont,
  38                        (FcChar8*)ELIPSES, strlen(ELIPSES), &info);
  39     f->elipses_length = (signed) info.xOff;
  40 }
  41
  42 ObFont *font_open(char *fontstring)
  43 {
  44     ObFont *out;
  45     XftFont *xf;
  46
  47     if ((xf = XftFontOpenName(ob_display, ob_screen, fontstring))) {
  48         out = g_new(ObFont, 1);
  49         out->xftfont = xf;
  50         measure_height(out);
  51         return out;
  52     }
  53     g_warning(_("Unable to load font: %s\n"), fontstring);
  54     g_warning(_("Trying fallback font: %s\n"), "sans");
  55
  56     if ((xf = XftFontOpenName(ob_display, ob_screen, "sans"))) {
  57         out = g_new(ObFont, 1);
  58         out->xftfont = xf;
  59         measure_height(out);
  60         return out;
  61     }
  62     g_warning(_("Unable to load font: %s\n"), "sans");
  63     g_warning(_("Aborting!.\n"));
  64
  65     exit(3); /* can't continue without a font */
  66 }
  67
  68 void font_close(ObFont *f)
  69 {
  70     if (f) {
  71         XftFontClose(ob_display, f->xftfont);
  72         g_free(f);
  73     }
  74 }
  75
  76 void font_measure_full(ObFont *f, char *str, int shadow, int offset,
  77                        int *x, int *y)
  78 {
  79     XGlyphInfo info;
  80
  81     XftTextExtentsUtf8(ob_display, f->xftfont,
  82                        (FcChar8*)str, strlen(str), &info);
  83
  84     *x = (signed) info.xOff + (shadow ? ABS(offset) : 0);
  85     *y = info.height + (shadow ? ABS(offset) : 0);
  86 }
  87
  88 int font_measure_string(ObFont *f, char *str, int shadow, int offset)
  89 {
  90     int x, y;
  91     font_measure_full (f, str, shadow, offset, &x, &y);
  92     return x;
  93 }
  94
  95 int font_height(ObFont *f, int shadow, int offset)
  96 {
  97     return f->xftfont->ascent + f->xftfont->descent + (shadow ? offset : 0);
  98 }
  99
 100 int font_max_char_width(ObFont *f)
 101 {
 102     return (signed) f->xftfont->max_advance_width;
 103 }
 104
 105 void font_draw(XftDraw *d, TextureText *t, Rect *position)
 106 {
 107     int x,y,w,h;
 108     XftColor c;
 109     GString *text;
 110     int mw, em, mh;
 111     size_t l;
 112     gboolean shortened = FALSE;
 113
 114     y = position->y;
 115     w = position->width;
 116     h = position->height;
 117
 118     text = g_string_new(t->string);
 119     l = g_utf8_strlen(text->str, -1);
 120     font_measure_full(t->font, text->str, t->shadow, t->offset, &mw, &mh);
 121     while (l && mw > position->width) {
 122         shortened = TRUE;
 123         /* remove a character from the middle */
 124         text = g_string_erase(text, l-- / 2, 1);
 125         em = ELIPSES_LENGTH(t->font, t->shadow, t->offset);
 126         /* if the elipses are too large, don't show them at all */
 127         if (em > position->width)
 128             shortened = FALSE;
 129         font_measure_full(t->font, text->str, t->shadow, t->offset, &mw, &mh);
 130         mw += em;
 131     }
 132     if (shortened) {
 133         text = g_string_insert(text, (l + 1) / 2, ELIPSES);
 134         l += 3;
 135     }
 136     if (!l) return;
 137
 138     /* center vertically */
 139     y -= ((t->font->xftfont->ascent + t->font->xftfont->descent) - mh) / 2;
 140
 141     switch (t->justify) {
 142     case Justify_Left:
 143         x = position->x;
 144         break;
 145     case Justify_Right:
 146         x = position->x + (w - mw);
 147         break;
 148     case Justify_Center:
 149         x = position->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 }