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 PangoFontMap *pfm;
  47 PangoContext *context;
  48
  49 static gboolean started = FALSE;
  50
  51 static void font_startup(void)
  52 {
  53     if (!XftInit(0)) {
  54         g_warning(_("Couldn't initialize Xft."));
  55         exit(EXIT_FAILURE);
  56     }
  57
  58 #ifdef USE_PANGO
  59     g_type_init();
  60     /* these will never be freed, but we will need them until we shut down anyway */
  61     pfm = pango_xft_get_font_map(RrDisplay(NULL), RrScreen(NULL));
  62     context = pango_xft_get_context(RrDisplay(NULL), RrScreen(NULL));
  63 #endif /* USE_PANGO */
  64     /* Here we are teaching xft about the shadow, shadowoffset & shadowtint */
  65     FcNameRegisterObjectTypes(objs, (sizeof(objs) / sizeof(objs[0])));
  66 }
  67
  68 static void measure_font(RrFont *f)
  69 {
  70     /* xOff, yOff is the normal spacing to the next glyph. */
  71     XGlyphInfo info;
  72
  73     /* measure an elipses */
  74     XftTextExtentsUtf8(RrDisplay(f->inst), f->xftfont,
  75                        (FcChar8*)ELIPSES, strlen(ELIPSES), &info);
  76     f->elipses_length = (signed) info.xOff;
  77 }
  78
  79 static RrFont *openfont(const RrInstance *inst, gchar *fontstring)
  80 {
  81     /* This function is called for each font in the theme file. */
  82     /* It returns a pointer to a RrFont struct after filling it. */
  83     RrFont *out;
  84     FcPattern *pat, *match;
  85     XftFont *font;
  86     FcResult res;
  87     gint tint;
  88 #ifdef USE_PANGO
  89     guchar *tmp_string = NULL;
  90     gint tmp_int;
  91 #endif /* USE_PANGO */
  92
  93     if (!(pat = XftNameParse(fontstring)))
  94         return NULL;
  95
  96     match = XftFontMatch(RrDisplay(inst), RrScreen(inst), pat, &res);
  97     FcPatternDestroy(pat);
  98     if (!match)
  99         return NULL;
 100
 101     out = g_new(RrFont, 1);
 102     out->inst = inst;
 103 #ifdef USE_PANGO
 104     /*    printf("\n\n%s\n\n",fontstring);
 105           FcPatternPrint(match); */
 106
 107     out->pango_font_description = pango_font_description_new();
 108
 109     if (FcPatternGetString(match, "family", 0, &tmp_string) != FcResultTypeMismatch) {
 110         pango_font_description_set_family(out->pango_font_description, (gchar *)tmp_string);
 111         tmp_string = NULL;
 112     }
 113     if (FcPatternGetString(match, "style", 0, &tmp_string) != FcResultTypeMismatch) {
 114         /* Bold ? */
 115         if (!strcasecmp("bold", (gchar *)tmp_string)) {
 116             pango_font_description_set_weight(out->pango_font_description, PANGO_WEIGHT_BOLD);
 117         }
 118         /* Italic ? */
 119         else if (!strcasecmp("italic", (gchar *)tmp_string)) {
 120             pango_font_description_set_style(out->pango_font_description, PANGO_STYLE_ITALIC);
 121         }
 122         tmp_string = NULL;
 123     }
 124
 125     if (FcPatternGetInteger(match, "pixelsize", 0, &tmp_int) != FcResultTypeMismatch) {
 126         /* TODO: is PANGO_SCALE correct ?? */
 127         pango_font_description_set_size(out->pango_font_description, tmp_int*PANGO_SCALE);
 128     }
 129
 130     PangoFontset *pfs = pango_font_map_load_fontset(pfm, context, out->pango_font_description, NULL);
 131     out->pango_font_metrics = pango_fontset_get_metrics(pfs);
 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_metrics_unref(f->pango_font_metrics);
 192     pango_font_description_free(f->pango_font_description);
 193 #endif
 194 }
 195
 196 static void font_measure_full(const RrFont *f, const gchar *str,
 197                               gint *x, gint *y)
 198 {
 199 #ifdef USE_PANGO
 200     PangoLayout *pl;
 201     PangoRectangle rect;
 202     pl = pango_layout_new (context);
 203     pango_layout_set_text(pl, str, -1);
 204     pango_layout_set_font_description(pl, f->pango_font_description);
 205     pango_layout_set_single_paragraph_mode(pl, TRUE);
 206     pango_layout_get_pixel_extents(pl, NULL, &rect);
 207     *x = rect.width + (f->shadow ? ABS(f->offset) : 0);
 208     *y = rect.height + (f->shadow ? ABS(f->offset) : 0);
 209     g_object_unref(pl);
 210
 211 #else
 212     XGlyphInfo info;
 213
 214     XftTextExtentsUtf8(RrDisplay(f->inst), f->xftfont,
 215                        (const FcChar8*)str, strlen(str), &info);
 216
 217     *x = (signed) info.xOff + (f->shadow ? ABS(f->offset) : 0);
 218     *y = info.height + (f->shadow ? ABS(f->offset) : 0);
 219 #endif /* USE_PANGO */
 220 }
 221
 222 RrSize *RrFontMeasureString(const RrFont *f, const gchar *str)
 223 {
 224     RrSize *size;
 225     size = g_new(RrSize, 1);
 226     font_measure_full (f, str, &size->width, &size->height);
 227     return size;
 228 }
 229
 230 gint RrFontHeight(const RrFont *f)
 231 {
 232 #ifdef USE_PANGO
 233     int ascent, descent;
 234     ascent = pango_font_metrics_get_ascent(f->pango_font_metrics);
 235     descent = pango_font_metrics_get_descent(f->pango_font_metrics);
 236     return (ascent + descent) / PANGO_SCALE;
 237 #else
 238     return f->xftfont->ascent + f->xftfont->descent +
 239         (f->shadow ? f->offset : 0);
 240 #endif
 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 #ifndef USE_PANGO
 255     size_t l;
 256     gboolean shortened = FALSE;
 257 #else
 258     PangoLayout *pl;
 259     PangoRectangle rect;
 260
 261     pl = pango_layout_new (context);
 262 #endif /* USE_PANGO */
 263
 264     /* center vertically */
 265 #ifndef USE_PANGO /* We have to wait for the text string with pango */
 266     y = area->y +
 267         (area->height - RrFontHeight(t->font)) / 2;
 268 #endif
 269     /* the +2 and -4 leave a small blank edge on the sides */
 270     x = area->x + 2;
 271     w = area->width - 4;
 272     h = area->height;
 273
 274     text = g_string_new(t->string);
 275 #ifndef USE_PANGO
 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 #else
 308     pango_layout_set_text(pl, text->str, -1);
 309     pango_layout_set_font_description(pl, t->font->pango_font_description);
 310     pango_layout_set_single_paragraph_mode(pl, TRUE);
 311     pango_layout_set_width(pl, w * PANGO_SCALE);
 312     pango_layout_set_ellipsize(pl, PANGO_ELLIPSIZE_MIDDLE);
 313     pango_layout_set_alignment(pl, (PangoAlignment)(t->justify));
 314     pango_layout_get_pixel_extents(pl, NULL, &rect);
 315     y = area->y +
 316         (area->height - rect.height) / 2;
 317
 318 #endif /* USE_PANGO */
 319
 320     if (t->font->shadow) {
 321         if (t->font->tint >= 0) {
 322             c.color.red = 0;
 323             c.color.green = 0;
 324             c.color.blue = 0;
 325             c.color.alpha = 0xffff * t->font->tint / 100;
 326             c.pixel = BlackPixel(RrDisplay(t->font->inst),
 327                                  RrScreen(t->font->inst));
 328         } else {
 329             c.color.red = 0xffff;
 330             c.color.green = 0xffff;
 331             c.color.blue = 0xffff;
 332             c.color.alpha = 0xffff * -t->font->tint / 100;
 333             c.pixel = WhitePixel(RrDisplay(t->font->inst),
 334                                  RrScreen(t->font->inst));
 335         }
 336 #ifndef USE_PANGO
 337         XftDrawStringUtf8(d, &c, t->font->xftfont, x + t->font->offset,
 338                           t->font->xftfont->ascent + y + t->font->offset,
 339                           (FcChar8*)text->str, l);
 340 #else /* USE_PANGO */
 341         pango_xft_render_layout(d, &c, pl, (x + t->font->offset) * PANGO_SCALE,
 342                                 (y + t->font->offset) * PANGO_SCALE);
 343 #endif /* USE_PANGO */
 344     }
 345     c.color.red = t->color->r | t->color->r << 8;
 346     c.color.green = t->color->g | t->color->g << 8;
 347     c.color.blue = t->color->b | t->color->b << 8;
 348     c.color.alpha = 0xff | 0xff << 8; /* fully opaque text */
 349     c.pixel = t->color->pixel;
 350
 351 #ifndef USE_PANGO
 352     XftDrawStringUtf8(d, &c, t->font->xftfont, x,
 353                       t->font->xftfont->ascent + y,
 354                       (FcChar8*)text->str, l);
 355 #else /* USE_PANGO */
 356     pango_xft_render_layout(d, &c, pl, x * PANGO_SCALE, y * PANGO_SCALE);
 357     g_object_unref(pl);
 358 #endif
 359
 360     g_string_free(text, TRUE);
 361     return;
 362 }