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