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

   1 /* -*- indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*-
   2
   3    font.c for the Openbox window manager
   4    Copyright (c) 2003        Ben Jansens
   5    Copyright (c) 2003        Derek Foreman
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    See the COPYING file for a copy of the GNU General Public License.
  18 */
  19
  20 #include "font.h"
  21 #include "color.h"
  22 #include "mask.h"
  23 #include "theme.h"
  24 #include "gettext.h"
  25
  26 #include <X11/Xft/Xft.h>
  27 #include <glib.h>
  28 #include <string.h>
  29 #include <stdlib.h>
  30
  31 #define ELIPSES "..."
  32 #define ELIPSES_LENGTH(font) \
  33     (font->elipses_length + (font->shadow ? font->offset : 0))
  34
  35 #define OB_SHADOW "shadow"
  36 #define OB_SHADOW_OFFSET "shadowoffset"
  37 #define OB_SHADOW_ALPHA "shadowtint"
  38
  39 FcObjectType objs[] = {
  40     { OB_SHADOW,        FcTypeBool    },
  41     { OB_SHADOW_OFFSET, FcTypeInteger },
  42     { OB_SHADOW_ALPHA,  FcTypeInteger  }
  43 };
  44
  45 static gboolean started = FALSE;
  46
  47 static void font_startup(void)
  48 {
  49     if (!XftInit(0)) {
  50         g_warning(_("Couldn't initialize Xft."));
  51         exit(EXIT_FAILURE);
  52     }
  53     FcNameRegisterObjectTypes(objs, (sizeof(objs) / sizeof(objs[0])));
  54 }
  55
  56 static void measure_font(RrFont *f)
  57 {
  58     XGlyphInfo info;
  59
  60     /* measure an elipses */
  61     XftTextExtentsUtf8(RrDisplay(f->inst), f->xftfont,
  62                        (FcChar8*)ELIPSES, strlen(ELIPSES), &info);
  63     f->elipses_length = (signed) info.xOff;
  64 }
  65
  66 static RrFont *openfont(const RrInstance *inst, char *fontstring)
  67 {
  68     RrFont *out;
  69     FcPattern *pat, *match;
  70     XftFont *font;
  71     FcResult res;
  72     gint tint;
  73
  74     if (!(pat = XftNameParse(fontstring)))
  75         return NULL;
  76
  77     match = XftFontMatch(RrDisplay(inst), RrScreen(inst), pat, &res);
  78     FcPatternDestroy(pat);
  79     if (!match)
  80         return NULL;
  81
  82     out = g_new(RrFont, 1);
  83     out->inst = inst;
  84
  85     if (FcPatternGetBool(match, OB_SHADOW, 0, &out->shadow) != FcResultMatch)
  86         out->shadow = FALSE;
  87
  88     if (FcPatternGetInteger(match, OB_SHADOW_OFFSET, 0, &out->offset) !=
  89         FcResultMatch)
  90         out->offset = 1;
  91
  92     if (FcPatternGetInteger(match, OB_SHADOW_ALPHA, 0, &tint) != FcResultMatch)
  93         tint = 25;
  94     if (tint > 100) tint = 100;
  95     else if (tint < -100) tint = -100;
  96     out->tint = tint;
  97
  98     font = XftFontOpenPattern(RrDisplay(inst), match);
  99     if (!font) {
 100         FcPatternDestroy(match);
 101         g_free(out);
 102         return NULL;
 103     } else
 104         out->xftfont = font;
 105
 106     measure_font(out);
 107
 108     return out;
 109 }
 110
 111 RrFont *RrFontOpen(const RrInstance *inst, char *fontstring)
 112 {
 113     RrFont *out;
 114
 115     if (!started) {
 116         font_startup();
 117         started = TRUE;
 118     }
 119
 120     if ((out = openfont(inst, fontstring)))
 121         return out;
 122     g_warning(_("Unable to load font: %s\n"), fontstring);
 123     g_warning(_("Trying fallback font: %s\n"), "sans");
 124
 125     if ((out = openfont(inst, "sans")))
 126         return out;
 127     g_warning(_("Unable to load font: %s\n"), "sans");
 128
 129     return NULL;
 130 }
 131
 132 void RrFontClose(RrFont *f)
 133 {
 134     if (f) {
 135         XftFontClose(RrDisplay(f->inst), f->xftfont);
 136         g_free(f);
 137     }
 138 }
 139
 140 static void font_measure_full(const RrFont *f, const gchar *str,
 141                               gint *x, gint *y)
 142 {
 143     XGlyphInfo info;
 144
 145     XftTextExtentsUtf8(RrDisplay(f->inst), f->xftfont,
 146                        (const FcChar8*)str, strlen(str), &info);
 147
 148     *x = (signed) info.xOff + (f->shadow ? ABS(f->offset) : 0);
 149     *y = info.height + (f->shadow ? ABS(f->offset) : 0);
 150 }
 151
 152 int RrFontMeasureString(const RrFont *f, const gchar *str)
 153 {
 154     gint x, y;
 155     font_measure_full (f, str, &x, &y);
 156     return x + 4;
 157 }
 158
 159 int RrFontHeight(const RrFont *f)
 160 {
 161     return f->xftfont->ascent + f->xftfont->descent +
 162         (f->shadow ? f->offset : 0);
 163 }
 164
 165 int RrFontMaxCharWidth(const RrFont *f)
 166 {
 167     return (signed) f->xftfont->max_advance_width;
 168 }
 169
 170 void RrFontDraw(XftDraw *d, RrTextureText *t, RrRect *area)
 171 {
 172     gint x,y,w,h;
 173     XftColor c;
 174     GString *text;
 175     gint mw, mh;
 176     size_t l;
 177     gboolean shortened = FALSE;
 178
 179     /* center vertically */
 180     y = area->y +
 181         (area->height - RrFontHeight(t->font)) / 2;
 182     /* the +2 and -4 leave a small blank edge on the sides */
 183     x = area->x + 2;
 184     w = area->width - 4;
 185     h = area->height;
 186
 187     text = g_string_new(t->string);
 188     l = g_utf8_strlen(text->str, -1);
 189     font_measure_full(t->font, text->str, &mw, &mh);
 190     while (l && mw > area->width) {
 191         shortened = TRUE;
 192         /* remove a character from the middle */
 193         text = g_string_erase(text, l-- / 2, 1);
 194         /* if the elipses are too large, don't show them at all */
 195         if (ELIPSES_LENGTH(t->font) > area->width)
 196             shortened = FALSE;
 197         font_measure_full(t->font, text->str, &mw, &mh);
 198         mw += ELIPSES_LENGTH(t->font);
 199     }
 200     if (shortened) {
 201         text = g_string_insert(text, (l + 1) / 2, ELIPSES);
 202         l += 3;
 203     }
 204     if (!l) return;
 205
 206     switch (t->justify) {
 207     case RR_JUSTIFY_LEFT:
 208         break;
 209     case RR_JUSTIFY_RIGHT:
 210         x += (w - mw);
 211         break;
 212     case RR_JUSTIFY_CENTER:
 213         x += (w - mw) / 2;
 214         break;
 215     }
 216
 217     l = strlen(text->str); /* number of bytes */
 218
 219     if (t->font->shadow) {
 220         if (t->font->tint >= 0) {
 221             c.color.red = 0;
 222             c.color.green = 0;
 223             c.color.blue = 0;
 224             c.color.alpha = 0xffff * t->font->tint / 100;
 225             c.pixel = BlackPixel(RrDisplay(t->font->inst),
 226                                  RrScreen(t->font->inst));
 227         } else {
 228             c.color.red = 0xffff;
 229             c.color.green = 0xffff;
 230             c.color.blue = 0xffff;
 231             c.color.alpha = 0xffff * -t->font->tint / 100;
 232             c.pixel = WhitePixel(RrDisplay(t->font->inst),
 233                                  RrScreen(t->font->inst));
 234         }
 235         XftDrawStringUtf8(d, &c, t->font->xftfont, x + t->font->offset,
 236                           t->font->xftfont->ascent + y + t->font->offset,
 237                           (FcChar8*)text->str, l);
 238     }
 239     c.color.red = t->color->r | t->color->r << 8;
 240     c.color.green = t->color->g | t->color->g << 8;
 241     c.color.blue = t->color->b | t->color->b << 8;
 242     c.color.alpha = 0xff | 0xff << 8; /* fully opaque text */
 243     c.pixel = t->color->pixel;
 244
 245     XftDrawStringUtf8(d, &c, t->font->xftfont, x,
 246                       t->font->xftfont->ascent + y,
 247                       (FcChar8*)text->str, l);
 248
 249     g_string_free(text, TRUE);
 250     return;
 251 }