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 "geom.h"
  25 #include "gettext.h"
  26
  27 #include <X11/Xft/Xft.h>
  28 #include <glib.h>
  29 #include <string.h>
  30 #include <stdlib.h>
  31
  32 #define ELIPSES "..."
  33 #define ELIPSES_LENGTH(font) \
  34     (font->elipses_length + (font->shadow ? font->offset : 0))
  35
  36 #define OB_SHADOW "shadow"
  37 #define OB_SHADOW_OFFSET "shadowoffset"
  38 #define OB_SHADOW_ALPHA "shadowtint"
  39
  40 FcObjectType objs[] = {
  41     { OB_SHADOW,        FcTypeBool    },
  42     { OB_SHADOW_OFFSET, FcTypeInteger },
  43     { OB_SHADOW_ALPHA,  FcTypeInteger  }
  44 };
  45
  46 static PangoContext *context;
  47 static gboolean started = FALSE;
  48
  49 static void font_startup(void)
  50 {
  51     if (!XftInit(0)) {
  52         g_warning(_("Couldn't initialize Xft."));
  53         exit(EXIT_FAILURE);
  54     }
  55
  56 #ifdef USE_PANGO
  57     g_type_init();
  58     /* these will never be freed, but we will need
  59      * them until we shut down anyway */
  60     context = pango_xft_get_context(RrDisplay(NULL), RrScreen(NULL));
  61 #endif /* USE_PANGO */
  62     /* Here we are teaching xft about the shadow, shadowoffset & shadowtint */
  63     FcNameRegisterObjectTypes(objs, (sizeof(objs) / sizeof(objs[0])));
  64 }
  65
  66 static void measure_font(RrFont *f)
  67 {
  68     /* xOff, yOff is the normal spacing to the next glyph. */
  69     XGlyphInfo info;
  70
  71     /* measure an elipses */
  72     XftTextExtentsUtf8(RrDisplay(f->inst), f->xftfont,
  73                        (FcChar8*)ELIPSES, strlen(ELIPSES), &info);
  74     f->elipses_length = (signed) info.xOff;
  75 }
  76
  77 static RrFont *openfont(const RrInstance *inst, gchar *fontstring)
  78 {
  79     /* This function is called for each font in the theme file. */
  80     /* It returns a pointer to a RrFont struct after filling it. */
  81     RrFont *out;
  82     FcPattern *pat, *match;
  83     XftFont *font;
  84     FcResult res;
  85     gint tint;
  86 #ifdef USE_PANGO
  87     guchar *tmp_string = NULL;
  88     gint tmp_int;
  89 #endif /* USE_PANGO */
  90
  91     if (!(pat = XftNameParse(fontstring)))
  92         return NULL;
  93
  94     match = XftFontMatch(RrDisplay(inst), RrScreen(inst), pat, &res);
  95     FcPatternDestroy(pat);
  96     if (!match)
  97         return NULL;
  98
  99     out = g_new(RrFont, 1);
 100     out->inst = inst;
 101 #ifdef USE_PANGO
 102     out->pango_font_description = pango_font_description_new();
 103
 104     if (FcPatternGetString(match, "family", 0, &tmp_string) !=
 105             FcResultTypeMismatch) {
 106         pango_font_description_set_family(out->pango_font_description,
 107                                           (gchar *)tmp_string);
 108         tmp_string = NULL;
 109     }
 110     if (FcPatternGetString(match, "style", 0, &tmp_string) !=
 111             FcResultTypeMismatch) {
 112         /* Bold ? */
 113         if (!strcasecmp("bold", (gchar *)tmp_string)) {
 114             pango_font_description_set_weight(out->pango_font_description,
 115                                               PANGO_WEIGHT_BOLD);
 116         }
 117         /* Italic ? */
 118         else if (!strcasecmp("italic", (gchar *)tmp_string)) {
 119             pango_font_description_set_style(out->pango_font_description,
 120                                              PANGO_STYLE_ITALIC);
 121         }
 122         tmp_string = NULL;
 123     }
 124
 125     if (FcPatternGetInteger(match, "pixelsize", 0, &tmp_int) !=
 126             FcResultTypeMismatch) {
 127         /* TODO: is PANGO_SCALE correct ?? */
 128         pango_font_description_set_size(out->pango_font_description,
 129                                         tmp_int*PANGO_SCALE);
 130     }
 131
 132     /* based on gtkmain.c gtk_get_default_language() */
 133     PangoLanguage *ln;
 134     gchar *locale, *p;
 135     locale = g_strdup(setlocale(LC_CTYPE, NULL));
 136     if ((p = strchr(locale, '.')))
 137         *p = '\0';
 138     if ((p = strchr(locale, '@')))
 139         *p = '\0';
 140     PangoFontMetrics *metrics =
 141         pango_context_get_metrics(context, out->pango_font_description,
 142                                   ln = pango_language_from_string(locale));
 143     out->pango_ascent = pango_font_metrics_get_ascent(metrics);
 144     out->pango_descent = pango_font_metrics_get_descent(metrics);
 145     g_free(locale);
 146     pango_font_metrics_unref(metrics);
 147 #endif /* USE_PANGO */
 148
 149     if (FcPatternGetBool(match, OB_SHADOW, 0, &out->shadow) != FcResultMatch)
 150         out->shadow = FALSE;
 151
 152     if (FcPatternGetInteger(match, OB_SHADOW_OFFSET, 0, &out->offset) !=
 153         FcResultMatch)
 154         out->offset = 1;
 155
 156     if (FcPatternGetInteger(match, OB_SHADOW_ALPHA, 0, &tint) != FcResultMatch)
 157         tint = 25;
 158     if (tint > 100) tint = 100;
 159     else if (tint < -100) tint = -100;
 160     out->tint = tint;
 161
 162     font = XftFontOpenPattern(RrDisplay(inst), match);
 163     if (!font) {
 164         FcPatternDestroy(match);
 165         g_free(out);
 166         return NULL;
 167     } else
 168         out->xftfont = font;
 169
 170 #ifdef USE_PANGO
 171     /*        FcPatternDestroy(match); */
 172 #endif /* USE_PANGO */
 173     measure_font(out);
 174
 175     return out;
 176 }
 177
 178 RrFont *RrFontOpen(const RrInstance *inst, gchar *fontstring)
 179 {
 180     RrFont *out;
 181
 182     if (!started) {
 183         font_startup();
 184         started = TRUE;
 185     }
 186
 187     if ((out = openfont(inst, fontstring)))
 188         return out;
 189     g_warning(_("Unable to load font: %s\n"), fontstring);
 190     g_warning(_("Trying fallback font: %s\n"), "sans");
 191
 192     if ((out = openfont(inst, "sans")))
 193         return out;
 194     g_warning(_("Unable to load font: %s\n"), "sans");
 195
 196     return NULL;
 197 }
 198
 199 void RrFontClose(RrFont *f)
 200 {
 201     if (f) {
 202         XftFontClose(RrDisplay(f->inst), f->xftfont);
 203         g_free(f);
 204     }
 205 #ifdef USE_PANGO
 206     pango_font_description_free(f->pango_font_description);
 207 #endif
 208 }
 209
 210 static void font_measure_full(const RrFont *f, const gchar *str,
 211                               gint *x, gint *y)
 212 {
 213 #ifdef USE_PANGO
 214     PangoLayout *pl;
 215     PangoRectangle rect;
 216     pl = pango_layout_new (context);
 217     pango_layout_set_text(pl, str, -1);
 218     pango_layout_set_font_description(pl, f->pango_font_description);
 219     pango_layout_set_single_paragraph_mode(pl, TRUE);
 220     pango_layout_get_pixel_extents(pl, NULL, &rect);
 221     *x = rect.width + (f->shadow ? ABS(f->offset) : 0);
 222     *y = rect.height + (f->shadow ? ABS(f->offset) : 0);
 223     g_object_unref(pl);
 224
 225 #else
 226     XGlyphInfo info;
 227
 228     XftTextExtentsUtf8(RrDisplay(f->inst), f->xftfont,
 229                        (const FcChar8*)str, strlen(str), &info);
 230
 231     *x = (signed) info.xOff + (f->shadow ? ABS(f->offset) : 0);
 232     *y = info.height + (f->shadow ? ABS(f->offset) : 0);
 233 #endif /* USE_PANGO */
 234 }
 235
 236 RrSize *RrFontMeasureString(const RrFont *f, const gchar *str)
 237 {
 238     RrSize *size;
 239     size = g_new(RrSize, 1);
 240     font_measure_full (f, str, &size->width, &size->height);
 241     return size;
 242 }
 243
 244 gint RrFontHeight(const RrFont *f)
 245 {
 246 #ifdef USE_PANGO
 247     return (f->pango_ascent
 248             + f->pango_descent
 249            ) / PANGO_SCALE +
 250            (f->shadow ? f->offset : 0);
 251 #else
 252     return f->xftfont->ascent + f->xftfont->descent +
 253            (f->shadow ? f->offset : 0);
 254 #endif
 255 }
 256
 257 gint RrFontMaxCharWidth(const RrFont *f)
 258 {
 259     return (signed) f->xftfont->max_advance_width;
 260 }
 261
 262 #ifdef USE_PANGO
 263 static inline int font_calculate_baseline(RrFont *f, gint height)
 264 {
 265 /* For my own reference:
 266  *   _________
 267  *  ^space/2  ^height     ^baseline
 268  *  v_________|_          |
 269  *            | ^ascent   |   _           _
 270  *            | |         |  | |_ _____ _| |_ _  _
 271  *            | |         |  |  _/ -_) \ /  _| || |
 272  *            | v_________v   \__\___/_\_\\__|\_, |
 273  *            | ^descent                      |__/
 274  *  __________|_v
 275  *  ^space/2  |
 276  *  V_________v
 277  */
 278     int asc = f->pango_ascent;
 279     int ascdesc = asc + f->pango_descent;
 280     int space = height * PANGO_SCALE - ascdesc;
 281     int baseline = space / 2 + asc;
 282     return baseline / PANGO_SCALE;
 283 }
 284 #endif
 285
 286 void RrFontDraw(XftDraw *d, RrTextureText *t, RrRect *area)
 287 {
 288     gint x,y,w,h;
 289     XftColor c;
 290     GString *text;
 291     gint mw, mh;
 292 #ifndef USE_PANGO
 293     size_t l;
 294     gboolean shortened = FALSE;
 295 #else
 296     PangoLayout *pl;
 297     PangoRectangle rect;
 298
 299     pl = pango_layout_new (context);
 300 #endif /* USE_PANGO */
 301
 302     /* center vertically
 303      * for xft we pass the top edge of the text for positioning... */
 304 #ifndef USE_PANGO
 305     y = area->y +
 306         (area->height - RrFontHeight(t->font)) / 2;
 307 #else
 308     /* but for pango we pass the baseline, since different fonts have
 309      * different top edges. It looks stupid when the baseline of "normal"
 310      * text jumps up and down when a "strange" character is just added
 311      * to the end of the text */
 312     y = area->y +
 313         font_calculate_baseline(t->font, area->height);
 314 #endif
 315     /* the +2 and -4 leave a small blank edge on the sides */
 316     x = area->x + 2;
 317     w = area->width - 4;
 318     h = area->height;
 319
 320     text = g_string_new(t->string);
 321 #ifndef USE_PANGO
 322     l = g_utf8_strlen(text->str, -1);
 323     font_measure_full(t->font, text->str, &mw, &mh);
 324     while (l && mw > area->width) {
 325         shortened = TRUE;
 326         /* remove a character from the middle */
 327         text = g_string_erase(text, l-- / 2, 1);
 328         /* if the elipses are too large, don't show them at all */
 329         if (ELIPSES_LENGTH(t->font) > area->width)
 330             shortened = FALSE;
 331         font_measure_full(t->font, text->str, &mw, &mh);
 332         mw += ELIPSES_LENGTH(t->font);
 333     }
 334     if (shortened) {
 335         text = g_string_insert(text, (l + 1) / 2, ELIPSES);
 336         l += 3;
 337     }
 338     if (!l) return;
 339
 340     l = strlen(text->str); /* number of bytes */
 341
 342 #else
 343     pango_layout_set_text(pl, text->str, -1);
 344     pango_layout_set_font_description(pl, t->font->pango_font_description);
 345     pango_layout_set_single_paragraph_mode(pl, TRUE);
 346     pango_layout_set_width(pl, w * PANGO_SCALE);
 347     pango_layout_set_ellipsize(pl, PANGO_ELLIPSIZE_MIDDLE);
 348     /* This doesn't work with layout_line() of course */
 349 /*    pango_layout_set_alignment(pl, (PangoAlignment)(t->justify)); */
 350     pango_layout_get_pixel_extents(pl, NULL, &rect);
 351     mw = rect.width;
 352
 353 #endif /* USE_PANGO */
 354
 355     switch (t->justify) {
 356     case RR_JUSTIFY_LEFT:
 357         break;
 358     case RR_JUSTIFY_RIGHT:
 359         x += (w - mw);
 360         break;
 361     case RR_JUSTIFY_CENTER:
 362         x += (w - mw) / 2;
 363         break;
 364     }
 365
 366     if (t->font->shadow) {
 367         if (t->font->tint >= 0) {
 368             c.color.red = 0;
 369             c.color.green = 0;
 370             c.color.blue = 0;
 371             c.color.alpha = 0xffff * t->font->tint / 100;
 372             c.pixel = BlackPixel(RrDisplay(t->font->inst),
 373                                  RrScreen(t->font->inst));
 374         } else {
 375             c.color.red = 0xffff;
 376             c.color.green = 0xffff;
 377             c.color.blue = 0xffff;
 378             c.color.alpha = 0xffff * -t->font->tint / 100;
 379             c.pixel = WhitePixel(RrDisplay(t->font->inst),
 380                                  RrScreen(t->font->inst));
 381         }
 382 #ifndef USE_PANGO
 383         XftDrawStringUtf8(d, &c, t->font->xftfont, x + t->font->offset,
 384                           t->font->xftfont->ascent + y + t->font->offset,
 385                           (FcChar8*)text->str, l);
 386 #else /* USE_PANGO */
 387         /* see below... */
 388         pango_xft_render_layout_line(d, &c, pango_layout_get_line(pl, 0),
 389                                      (x + t->font->offset) * PANGO_SCALE,
 390                                      (y + t->font->offset) * PANGO_SCALE);
 391 #endif /* USE_PANGO */
 392     }
 393     c.color.red = t->color->r | t->color->r << 8;
 394     c.color.green = t->color->g | t->color->g << 8;
 395     c.color.blue = t->color->b | t->color->b << 8;
 396     c.color.alpha = 0xff | 0xff << 8; /* fully opaque text */
 397     c.pixel = t->color->pixel;
 398
 399 #ifndef USE_PANGO
 400     XftDrawStringUtf8(d, &c, t->font->xftfont, x,
 401                       t->font->xftfont->ascent + y,
 402                       (FcChar8*)text->str, l);
 403 #else /* USE_PANGO */
 404     /* This looks retarded, but layout_line() bases y on the baseline, while
 405      * layout() bases y on the top of the ink layout shit ass fucking crap.
 406      * We want the baseline to always be in the same place, thusly, we use
 407      * layout_line()
 408      * The actual line doesn't need to be freed */
 409     pango_xft_render_layout_line(d, &c, pango_layout_get_line(pl, 0),
 410                                  x * PANGO_SCALE, y * PANGO_SCALE);
 411     g_object_unref(pl);
 412 #endif
 413
 414     g_string_free(text, TRUE);
 415     return;
 416 }