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