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
  54 #ifdef USE_PANGO
  55     g_type_init();
  56 #endif /* USE_PANGO */
  57     /* Here we are teaching xft about the shadow, shadowoffset & shadowtint */
  58     FcNameRegisterObjectTypes(objs, (sizeof(objs) / sizeof(objs[0])));
  59 }
  60
  61 static void measure_font(RrFont *f)
  62 {
  63     /* xOff, yOff is the normal spacing to the next glyph. */
  64     XGlyphInfo info;
  65
  66     /* measure an elipses */
  67 #ifndef USE_PANGO
  68     XftTextExtentsUtf8(RrDisplay(f->inst), f->xftfont,
  69                        (FcChar8*)ELIPSES, strlen(ELIPSES), &info);
  70     f->elipses_length = (signed) info.xOff;
  71 #else /* USE_PANGO */
  72     XftTextExtentsUtf8(RrDisplay(f->inst), f->xftfont,
  73                        (FcChar8*)ELIPSES, strlen(ELIPSES), &info);
  74     f->elipses_length = (signed) info.xOff;
  75 #endif /* USE_PANGO */
  76 }
  77
  78 static RrFont *openfont(const RrInstance *inst, gchar *fontstring)
  79 {
  80     /* This function is called for each font in the theme file. */
  81     /* It returns a pointer to a RrFont struct after filling it. */
  82     RrFont *out;
  83     FcPattern *pat, *match;
  84     XftFont *font;
  85     FcResult res;
  86     gint tint;
  87 #ifdef USE_PANGO
  88     gchar *tmp_string = NULL;
  89     gint tmp_int;
  90 #endif /* USE_PANGO */
  91
  92     if (!(pat = XftNameParse(fontstring)))
  93         return NULL;
  94
  95     match = XftFontMatch(RrDisplay(inst), RrScreen(inst), pat, &res);
  96     FcPatternDestroy(pat);
  97     if (!match)
  98         return NULL;
  99
 100     out = g_new(RrFont, 1);
 101     out->inst = inst;
 102 #ifdef USE_PANGO
 103     /*    printf("\n\n%s\n\n",fontstring);
 104           FcPatternPrint(match); */
 105
 106     out->pango_font_description = pango_font_description_new();
 107
 108     if (FcPatternGetString(match, "family", 0, &tmp_string) != FcResultTypeMismatch) {
 109         pango_font_description_set_family(out->pango_font_description, tmp_string);
 110         tmp_string = NULL;
 111     }
 112     if (FcPatternGetString(match, "style", 0, &tmp_string) != FcResultTypeMismatch) {
 113         /* Bold ? */
 114         if (!strcasecmp("bold", tmp_string)) {
 115             pango_font_description_set_weight(out->pango_font_description, PANGO_WEIGHT_BOLD);
 116         }
 117         /* Italic ? */
 118         else if (!strcasecmp("italic", tmp_string)) {
 119             pango_font_description_set_style(out->pango_font_description, PANGO_STYLE_ITALIC);
 120         }
 121         tmp_string = NULL;
 122     }
 123
 124     if (FcPatternGetInteger(match, "pixelsize", 0, &tmp_int) != FcResultTypeMismatch) {
 125         /* TODO: is PANGO_SCALE correct ?? */
 126         pango_font_description_set_size(out->pango_font_description, tmp_int*PANGO_SCALE);
 127     }
 128 #endif /* USE_PANGO */
 129
 130     if (FcPatternGetBool(match, OB_SHADOW, 0, &out->shadow) != FcResultMatch)
 131         out->shadow = FALSE;
 132
 133     if (FcPatternGetInteger(match, OB_SHADOW_OFFSET, 0, &out->offset) !=
 134         FcResultMatch)
 135         out->offset = 1;
 136
 137     if (FcPatternGetInteger(match, OB_SHADOW_ALPHA, 0, &tint) != FcResultMatch)
 138         tint = 25;
 139     if (tint > 100) tint = 100;
 140     else if (tint < -100) tint = -100;
 141     out->tint = tint;
 142
 143     font = XftFontOpenPattern(RrDisplay(inst), match);
 144     if (!font) {
 145         FcPatternDestroy(match);
 146         g_free(out);
 147         return NULL;
 148     } else
 149         out->xftfont = font;
 150
 151 #ifdef USE_PANGO
 152     /*        FcPatternDestroy(match); */
 153 #endif /* USE_PANGO */
 154     measure_font(out);
 155
 156     return out;
 157 }
 158
 159 RrFont *RrFontOpen(const RrInstance *inst, gchar *fontstring)
 160 {
 161     RrFont *out;
 162
 163     if (!started) {
 164         font_startup();
 165         started = TRUE;
 166     }
 167
 168     if ((out = openfont(inst, fontstring)))
 169         return out;
 170     g_warning(_("Unable to load font: %s\n"), fontstring);
 171     g_warning(_("Trying fallback font: %s\n"), "sans");
 172
 173     if ((out = openfont(inst, "sans")))
 174         return out;
 175     g_warning(_("Unable to load font: %s\n"), "sans");
 176
 177     return NULL;
 178 }
 179
 180 void RrFontClose(RrFont *f)
 181 {
 182     if (f) {
 183         XftFontClose(RrDisplay(f->inst), f->xftfont);
 184         g_free(f);
 185     }
 186 }
 187
 188 static void font_measure_full(const RrFont *f, const gchar *str,
 189                               gint *x, gint *y)
 190 {
 191 #ifdef USE_PANGO
 192     PangoContext *context;
 193     PangoLayout *pl;
 194     PangoRectangle rect;
 195     context = pango_xft_get_context (RrDisplay(f->inst), RrScreen(f->inst));
 196     pl = pango_layout_new (context);
 197     pango_layout_set_text(pl, str, -1);
 198     pango_layout_set_font_description(pl, f->pango_font_description);
 199     pango_layout_set_single_paragraph_mode(pl, TRUE);
 200     pango_layout_get_pixel_extents(pl, NULL, &rect);
 201     *x = rect.width + (f->shadow ? ABS(f->offset) : 0);
 202     *y = rect.height + (f->shadow ? ABS(f->offset) : 0);
 203     g_object_unref(pl);
 204     g_object_unref(context);
 205
 206 #else
 207     XGlyphInfo info;
 208
 209     XftTextExtentsUtf8(RrDisplay(f->inst), f->xftfont,
 210                        (const FcChar8*)str, strlen(str), &info);
 211
 212     *x = (signed) info.xOff + (f->shadow ? ABS(f->offset) : 0);
 213     *y = info.height + (f->shadow ? ABS(f->offset) : 0);
 214 #endif /* USE_PANGO */
 215 }
 216
 217 gint RrFontMeasureString(const RrFont *f, const gchar *str)
 218 {
 219     gint x, y;
 220     font_measure_full (f, str, &x, &y);
 221     return x + 4;
 222 }
 223
 224 gint RrFontHeight(const RrFont *f)
 225 {
 226 #ifndef USE_PANGO
 227     return f->xftfont->ascent + f->xftfont->descent +
 228         (f->shadow ? f->offset : 0);
 229 #else /* USE_PANGO */
 230      /*
 231      PangoContext *context = pango_context_new ();
 232
 233      PangoFontMetrics *metrics = pango_context_get_metrics(context, f->pango_font, NULL);
 234
 235      gint result =  pango_font_metrics_get_ascent (metrics) +
 236          pango_font_metrics_get_descent(metrics) +
 237          (f->shadow ? f->offset : 0);
 238
 239      pango_font_metrics_unref(metrics);
 240      g_object_unref(context);
 241      return result;
 242  */
 243     return f->xftfont->ascent + f->xftfont->descent +
 244         (f->shadow ? f->offset : 0);
 245
 246 #endif /* USE_PANGO */
 247 }
 248
 249 gint RrFontMaxCharWidth(const RrFont *f)
 250 {
 251     return (signed) f->xftfont->max_advance_width;
 252 }
 253
 254 void RrFontDraw(XftDraw *d, RrTextureText *t, RrRect *area)
 255 {
 256     gint x,y,w,h;
 257     XftColor c;
 258     GString *text;
 259     gint mw, mh;
 260     size_t l;
 261     gboolean shortened = FALSE;
 262
 263 #ifdef USE_PANGO
 264     PangoLayout *pl;
 265     PangoLayoutLine *pll;
 266     PangoContext *context;
 267     GSList *p;
 268
 269     context = pango_xft_get_context (RrDisplay(t->font->inst), RrScreen(t->font->inst));
 270     pl = pango_layout_new (context);
 271 #endif /* USE_PANGO */
 272
 273     /* center vertically */
 274     y = area->y +
 275         (area->height - RrFontHeight(t->font)) / 2;
 276     /* the +2 and -4 leave a small blank edge on the sides */
 277     x = area->x + 2;
 278     w = area->width - 4;
 279     h = area->height;
 280
 281     text = g_string_new(t->string);
 282     l = g_utf8_strlen(text->str, -1);
 283     font_measure_full(t->font, text->str, &mw, &mh);
 284     while (l && mw > area->width) {
 285         shortened = TRUE;
 286         /* remove a character from the middle */
 287         text = g_string_erase(text, l-- / 2, 1);
 288         /* if the elipses are too large, don't show them at all */
 289         if (ELIPSES_LENGTH(t->font) > area->width)
 290             shortened = FALSE;
 291         font_measure_full(t->font, text->str, &mw, &mh);
 292         mw += ELIPSES_LENGTH(t->font);
 293     }
 294     if (shortened) {
 295         text = g_string_insert(text, (l + 1) / 2, ELIPSES);
 296         l += 3;
 297     }
 298     if (!l) return;
 299
 300     switch (t->justify) {
 301     case RR_JUSTIFY_LEFT:
 302         break;
 303     case RR_JUSTIFY_RIGHT:
 304         x += (w - mw);
 305         break;
 306     case RR_JUSTIFY_CENTER:
 307         x += (w - mw) / 2;
 308         break;
 309     }
 310
 311     l = strlen(text->str); /* number of bytes */
 312
 313 #ifdef USE_PANGO
 314     pango_layout_set_text(pl, text->str, l);
 315     pango_layout_set_font_description(pl, t->font->pango_font_description);
 316     pango_layout_set_single_paragraph_mode(pl, TRUE);
 317     pll = pango_layout_get_line(pl, 0);
 318 #endif /* USE_PANGO */
 319
 320     if (t->font->shadow) {
 321 #ifdef USE_PANGO
 322         int x2 = x;
 323 #endif /* USE_PANGO */
 324         if (t->font->tint >= 0) {
 325             c.color.red = 0;
 326             c.color.green = 0;
 327             c.color.blue = 0;
 328             c.color.alpha = 0xffff * t->font->tint / 100;
 329             c.pixel = BlackPixel(RrDisplay(t->font->inst),
 330                                  RrScreen(t->font->inst));
 331         } else {
 332             c.color.red = 0xffff;
 333             c.color.green = 0xffff;
 334             c.color.blue = 0xffff;
 335             c.color.alpha = 0xffff * -t->font->tint / 100;
 336             c.pixel = WhitePixel(RrDisplay(t->font->inst),
 337                                  RrScreen(t->font->inst));
 338 #ifndef USE_PANGO
 339         }
 340         XftDrawStringUtf8(d, &c, t->font->xftfont, x + t->font->offset,
 341                           t->font->xftfont->ascent + y + t->font->offset,
 342                           (FcChar8*)text->str, l);
 343     }
 344 #else /* USE_PANGO */
 345         }
 346
 347     for (p = pll->runs; p != NULL; p = p->next)
 348         {
 349             PangoLayoutRun *run = p->data;
 350             PangoFont *font = run->item->analysis.font;
 351             PangoGlyphString *glyphs = run->glyphs;
 352             PangoRectangle rect;
 353
 354             pango_glyph_string_extents (glyphs, font, NULL, &rect);
 355             pango_xft_render (d, &c, font, glyphs, x2 + t->font->offset,
 356                               t->font->xftfont->ascent + y + t->font->offset);
 357             x2 += rect.width / PANGO_SCALE;
 358         }
 359     }
 360 #endif /* USE_PANGO */
 361     c.color.red = t->color->r | t->color->r << 8;
 362     c.color.green = t->color->g | t->color->g << 8;
 363     c.color.blue = t->color->b | t->color->b << 8;
 364     c.color.alpha = 0xff | 0xff << 8; /* fully opaque text */
 365     c.pixel = t->color->pixel;
 366
 367 #ifndef USE_PANGO
 368     XftDrawStringUtf8(d, &c, t->font->xftfont, x,
 369                       t->font->xftfont->ascent + y,
 370                       (FcChar8*)text->str, l);
 371 #else /* USE_PANGO */
 372     for (p = pll->runs; p != NULL; p = p->next)
 373         {
 374             PangoLayoutRun *run = p->data;
 375             PangoFont *font = run->item->analysis.font;
 376             PangoGlyphString *glyphs = run->glyphs;
 377             PangoRectangle rect;
 378
 379             pango_glyph_string_extents (glyphs, font, NULL, &rect);
 380             pango_xft_render (d, &c, font, glyphs, x, t->font->xftfont->ascent + y);
 381             x += rect.width / PANGO_SCALE;
 382         }
 383
 384     //    pango_layout_line_unref(pll);
 385         g_object_unref(pl);
 386         g_object_unref(context);
 387 #endif /* USE_PANGO */
 388
 389     g_string_free(text, TRUE);
 390     return;
 391 }