trunk/src/icons.c

/*
 * Copyright (C) 2008-2010 Till Harbaum <till@harbaum.org>.
 *
 * This file is part of GPXView.
 *
 * GPXView is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * GPXView is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GPXView.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "gpxview.h"
#include <math.h>     // for isnan()

struct icon_data {
  GdkPixbuf **data;
  int count;
} icons[] = {
  { NULL, CACHE_TYPE_MAX+5 },             /* ICON_CACHE_TYPE      */
  { NULL, CACHE_TYPE_MAX+5 },             /* ICON_CACHE_TYPE_SEMI */
  { NULL, CACHE_TYPE_MAX+5 },             /* ICON_CACHE_TYPE_1_5X */
  { NULL, CACHE_TYPE_MAX+5 },             /* ICON_CACHE_TYPE_2X   */
  { NULL, CACHE_CONT_MAX+1 },             /* ICON_CACHE_SIZE      */
  { NULL, 9 },                            /* ICON_STARS           */
  { NULL, LOG_TYPE_MAX+1 },               /* ICON_LOG             */
  { NULL, 9 },                            /* ICON_HEADING         */
  { NULL, WPT_SYM_MAX+1 },                /* ICON_WPT             */
  { NULL, 2 },                            /* ICON_TB              */
  { NULL, 8 },                            /* ICON_MISC            */
  { NULL, WPT_SYM_MAX+CACHE_TYPE_MAX+11 },/* ICON_POS             */
  { NULL, 3 },                            /* ICON_FILE            */
  { NULL, ATT_MAX+2 },                    /* ICON_ATT             */
  { NULL, -1 }
};

/* ICON_ATT */
static const char *att_icon_name[] = { 
  "no", "unknown",
  "dogs", "fee", "rappelling", "boat",                     // 1-4
  "scuba", "kids", "onehour", "scenic", "hiking",          // 5-9
  "climbing", "wading", "swimming", "available", "night",  // 10-14
  "winter", "unknown", "poisonoak", "snakes", "ticks",     // 15-19
  "mine", "cliff", "hunting", "danger", "wheelchair",      // 20-24
  "parking", "public", "water", "restrooms", "phone",      // 25-29
  "picnic", "camping", "bicycles", "motorcycles", "quads", // 30-34
  "jeeps", "snowmobiles", "horses", "campfires", "thorn",  // 35-39
  "stealth", "stroller", "firstaid", "cow", "flashlight",  // 40-44
  "landf", "unknown", "field_puzzle", "UV", "snowshoes",   // 45-49
  "skiis", "s_tool", "nightcache", "parkngrab", "abandonedbuilding", // 50-54
  "hike_short", "hike_med", "hike_long", "fuel", "food",   // 55-59
  NULL
};

/* ICON_CACHE_TYPE / ICON_CACHE_TYPE_SEMI / ICON_CACHE_TYPE_2X */
const char *cache_type_icon_name[] = {
  "traditional", "multi",      "mystery", "virtual", "webcam", "event",
  "letterbox",   "earthcache", "wherigo", "megaevent", "cito",

  /* special overlays */
  "ovl_override", "ovl_found", "ovl_note", "ovl_mine",

  NULL
};

/* ICON_CACHE_SIZE */
const char *cache_size_icon_name[] = {
  "regular", "small",      "micro", "other", "not_chosen", "large",
  "virtual", NULL
};

/* ICON_STARS      */
const char *stars_icon_name[] = {
  "1", "1_5", "2", "2_5", "3", "3_5", "4", "4_5", "5", NULL
};

/* ICON_LOG        */
const char *log_icon_name[] = {
  "smile", "sad", "maint", "note", "big_smile", "enabled",
  "greenlight", "rsvp", "attended", "camera", "disabled",
  "needsmaint", "coord_update",
  "traffic_cone",
  "traffic_cone", /* LOG_TYPE_NEEDS_ARCHIVED */
  "traffic_cone", 
  NULL
};  

/* ICON_HEADING    */
const char *heading_icon_name[] = {
  "n", "ne", "e", "se", "s", "sw", "w", "nw", "none", NULL
};

/* ICON_WPT        */
const char *wpt_sym_icon_name[] = {
  "multistage", "parking", "final", "question",
  "trailhead", "refpoint", NULL
};

/* ICON_TB         */
const char *tb_icon_name[] = {
  "tb", "coin", NULL
};

/* ICON_MISC         */
const char *misc_icon_name[] = {
  "32x32/locked", "32x32/unlocked", "32x32/delete", 
#ifdef FREMANTLE
  "64x64/paypal", 
#else
  "32x32/paypal", 
#endif
  "32x32/pos_geomath", 
#ifdef FREMANTLE
  "64x64/gpxview",
#else
  "32x32/gpxview",
#endif
#ifndef USE_MAEMO
  "16x16/speaker", "16x16/speaker_off",
#else
#ifndef FREMANTLE
  "24x24/speaker", "24x24/speaker_off",
#else
  "32x32/speaker", "32x32/speaker_off",
#endif
#endif

  NULL
};

/* ICON_POS        */
const char *pos_icon_name[] = {
  "wpt_multistage",         "wpt_parking",           "wpt_final",
  "wpt_question",           "wpt_trailhead",         "wpt_refpoint", 

  "cache_type_traditional", "cache_type_multi",      "cache_type_mystery", 
  "cache_type_virtual",     "cache_type_webcam",     "cache_type_event",
  "cache_type_letterbox",   "cache_type_earthcache", "cache_type_wherigo", 
  "cache_type_megaevent",   "cache_type_cito",

  "pos_wpt", "pos_gps", "pos_geomath", "pos_map", "pos_home",

  "pos_get", "pos_set", "maemo-mapper", "clipboard",

  NULL
};

/* ICON_FILE         */
const char *file_icon_name[] = {
  "gc", "folder", "zip", NULL
};

static void icons_load(int type, char *format, const char *names[]) {
  int i;

  if(!icons[type].count) {
    icons[type].data = NULL;
    return;
  }

  icons[type].data = malloc(sizeof(GdkPixbuf *) * icons[type].count);
  
  for(i=0;i<icons[type].count;i++) {
    g_assert(names[i]);

    GError *error = NULL;
    char filename[128];
    strcpy(filename, ICONPATH);
    snprintf(filename+strlen(filename),
             sizeof(filename)-strlen(filename), format, names[i], "png");
    icons[type].data[i] = gdk_pixbuf_new_from_file(filename, &error);
    
    if(error) {
      error = NULL;
      /* try again in local dir */
      strcpy(filename, "./data/icons/");
      snprintf(filename+strlen(filename), 
               sizeof(filename)-strlen(filename), format, names[i], "png");
      icons[type].data[i] = gdk_pixbuf_new_from_file(filename, &error);
        
      if(error) {
        icons[type].data[i] = NULL;
        g_warning("Could not load icon %s: %s\n", names[i], error->message);
        g_error_free(error);
        error = NULL;
      }   
    }
  }
  
  g_assert(!names[i]);
}

void icons_init(void) {

  /* load cache type icons */
  icons_load(ICON_CACHE_TYPE, "32x32/cache_type_%s.%s", cache_type_icon_name);

  /* load semitransparent cache type icons */
  icons_load(ICON_CACHE_TYPE_SEMI, "32x32/cache_type_%s_semi.%s", cache_type_icon_name);

  /* load 150% sized cache type icons */
  icons_load(ICON_CACHE_TYPE_1_5X, "48x48/cache_type_%s.%s", cache_type_icon_name);

  /* load double sized cache type icons */
  icons_load(ICON_CACHE_TYPE_2X, "64x64/cache_type_%s.%s", cache_type_icon_name);

  /* load cache container/size icons */
#if !defined(USE_MAEMO) || (MAEMO_VERSION_MAJOR < 5)
  icons_load(ICON_CACHE_SIZE, "45x12/cache_size_%s.%s", cache_size_icon_name);
#else
  icons_load(ICON_CACHE_SIZE, "90x24/cache_size_%s.%s", cache_size_icon_name);
#endif

  /* load cache difficulty/terrain/quality icons */
#if !defined(USE_MAEMO) || (MAEMO_VERSION_MAJOR < 5)
  icons_load(ICON_STARS, "12x12/stars%s.%s", stars_icon_name);
#else
  icons_load(ICON_STARS, "16x16/stars%s.%s", stars_icon_name);
#endif

  /* load cache log icons */
  icons_load(ICON_LOG, "32x32/log_icon_%s.%s", log_icon_name);

  /* load icons to visualize heading */
#if !defined(USE_MAEMO) || (MAEMO_VERSION_MAJOR < 5)
  icons_load(ICON_HEADING, "32x32/heading_%s.%s", heading_icon_name);
#else
  icons_load(ICON_HEADING, "48x48/heading_%s.%s", heading_icon_name);
#endif

  /* load waypoint icons */
  icons_load(ICON_WPT, "32x32/wpt_%s.%s", wpt_sym_icon_name);

  /* load travelbug/coin icons */
  icons_load(ICON_TB, "32x32/%s.%s", tb_icon_name);

  /* load misc icons */
  icons_load(ICON_MISC, "%s.%s", misc_icon_name);

  /* load pos icons */
#if !defined(USE_MAEMO)
  icons_load(ICON_POS, "16x16/%s.%s", pos_icon_name);
#else
#if (MAEMO_VERSION_MAJOR < 5)
  icons_load(ICON_POS, "24x24/%s.%s", pos_icon_name);
#else
  icons_load(ICON_POS, "32x32/%s.%s", pos_icon_name);
#endif
#endif

  /* load file icons */
  icons_load(ICON_FILE, "32x32/file_%s.%s", file_icon_name);

  /* load attribute icons */
  icons_load(ICON_ATT, "32x32/att_%s.%s", att_icon_name);
}

void icons_free(void) {
  int i;
  struct icon_data *icon = icons;

  while(icon->count >= 0) {
    if(icon->count) {
      for(i=0;i<icon->count;i++)
        if(icon->data[i])
          gdk_pixbuf_unref(icon->data[i]);

      free(icon->data);
    }

    icon++;
  }
}

GdkPixbuf *icon_get(int type, int num) {
  if(num < 0)                  return NULL;
  if(num >= icons[type].count) return NULL;

  return icons[type].data[num];
}

GtkWidget *icon_get_widget(int type, int num) {
  GdkPixbuf *pbuf = icon_get(type, num);
  if(!pbuf) return NULL;

  return gtk_image_new_from_pixbuf(pbuf);
}

/* routine to overlay two pixbufs */
GdkPixbuf *pixbuf_overlay(GdkPixbuf *bot, GdkPixbuf *top) {
  GdkPixbuf *pix = gdk_pixbuf_copy(bot);

  gdk_pixbuf_composite(top, pix,
       0, 0, gdk_pixbuf_get_width(bot), gdk_pixbuf_get_height(bot), 
       0.0, 0.0, 1.0, 1.0, GDK_INTERP_NEAREST, 255);

  return pix;
}

GtkWidget *icon_get_widget_ovl(int type, int num, int ovl) {
  GdkPixbuf *pbuf0 = icon_get(type, num);
  GdkPixbuf *pbuf1 = icon_get(type, ovl);
  if(!pbuf0 || !pbuf1) return NULL;

  GdkPixbuf *pbuf = pixbuf_overlay(pbuf0, pbuf1);
  GtkWidget *widget = gtk_image_new_from_pixbuf(pbuf);

  /* widget now holds a reference */
  gdk_pixbuf_unref(pbuf);
  
  return widget;
}

GdkPixbuf *icon_bearing(pos_t from, pos_t to) {
  if(isnan(from.lat) || isnan(from.lon) || 
     isnan(to.lat) || isnan(to.lon))
    return icon_get(ICON_HEADING, 8);

  int idx = (gpx_pos_get_bearing(from, to)+22.5)/45.0;

  /* make sure we stay in icon bounds */
  if(idx < 0) idx += 8;
  if(idx > 7) idx -= 8;
  return icon_get(ICON_HEADING, idx);
}

1	/*
2	* Copyright (C) 2008-2010 Till Harbaum <till@harbaum.org>.
3	*
4	* This file is part of GPXView.
5	*
6	* GPXView is free software: you can redistribute it and/or modify
7	* it under the terms of the GNU General Public License as published by
8	* the Free Software Foundation, either version 3 of the License, or
9	* (at your option) any later version.
10	*
11	* GPXView is distributed in the hope that it will be useful,
12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	* GNU General Public License for more details.
15	*
16	* You should have received a copy of the GNU General Public License
17	* along with GPXView. If not, see <http://www.gnu.org/licenses/>.
18	*/
19
20	#include "gpxview.h"
21	#include <math.h> // for isnan()
22
23	struct icon_data {
24	GdkPixbuf **data;
25	int count;
26	} icons[] = {
27	{ NULL, CACHE_TYPE_MAX+5 }, /* ICON_CACHE_TYPE */
28	{ NULL, CACHE_TYPE_MAX+5 }, /* ICON_CACHE_TYPE_SEMI */
29	{ NULL, CACHE_TYPE_MAX+5 }, /* ICON_CACHE_TYPE_1_5X */
30	{ NULL, CACHE_TYPE_MAX+5 }, /* ICON_CACHE_TYPE_2X */
31	{ NULL, CACHE_CONT_MAX+1 }, /* ICON_CACHE_SIZE */
32	{ NULL, 9 }, /* ICON_STARS */
33	{ NULL, LOG_TYPE_MAX+1 }, /* ICON_LOG */
34	{ NULL, 9 }, /* ICON_HEADING */
35	{ NULL, WPT_SYM_MAX+1 }, /* ICON_WPT */
36	{ NULL, 2 }, /* ICON_TB */
37	{ NULL, 8 }, /* ICON_MISC */
38	{ NULL, WPT_SYM_MAX+CACHE_TYPE_MAX+11 },/* ICON_POS */
39	{ NULL, 3 }, /* ICON_FILE */
40	{ NULL, ATT_MAX+2 }, /* ICON_ATT */
41	{ NULL, -1 }
42	};
43
44	/* ICON_ATT */
45	static const char *att_icon_name[] = {
46	"no", "unknown",
47	"dogs", "fee", "rappelling", "boat", // 1-4
48	"scuba", "kids", "onehour", "scenic", "hiking", // 5-9
49	"climbing", "wading", "swimming", "available", "night", // 10-14
50	"winter", "unknown", "poisonoak", "snakes", "ticks", // 15-19
51	"mine", "cliff", "hunting", "danger", "wheelchair", // 20-24
52	"parking", "public", "water", "restrooms", "phone", // 25-29
53	"picnic", "camping", "bicycles", "motorcycles", "quads", // 30-34
54	"jeeps", "snowmobiles", "horses", "campfires", "thorn", // 35-39
55	"stealth", "stroller", "firstaid", "cow", "flashlight", // 40-44
56	"landf", "unknown", "field_puzzle", "UV", "snowshoes", // 45-49
57	"skiis", "s_tool", "nightcache", "parkngrab", "abandonedbuilding", // 50-54
58	"hike_short", "hike_med", "hike_long", "fuel", "food", // 55-59
59	NULL
60	};
61
62	/* ICON_CACHE_TYPE / ICON_CACHE_TYPE_SEMI / ICON_CACHE_TYPE_2X */
63	const char *cache_type_icon_name[] = {
64	"traditional", "multi", "mystery", "virtual", "webcam", "event",
65	"letterbox", "earthcache", "wherigo", "megaevent", "cito",
66
67	/* special overlays */
68	"ovl_override", "ovl_found", "ovl_note", "ovl_mine",
69
70	NULL
71	};
72
73	/* ICON_CACHE_SIZE */
74	const char *cache_size_icon_name[] = {
75	"regular", "small", "micro", "other", "not_chosen", "large",
76	"virtual", NULL
77	};
78
79	/* ICON_STARS */
80	const char *stars_icon_name[] = {
81	"1", "1_5", "2", "2_5", "3", "3_5", "4", "4_5", "5", NULL
82	};
83
84	/* ICON_LOG */
85	const char *log_icon_name[] = {
86	"smile", "sad", "maint", "note", "big_smile", "enabled",
87	"greenlight", "rsvp", "attended", "camera", "disabled",
88	"needsmaint", "coord_update",
89	"traffic_cone",
90	"traffic_cone", /* LOG_TYPE_NEEDS_ARCHIVED */
91	"traffic_cone",
92	NULL
93	};
94
95	/* ICON_HEADING */
96	const char *heading_icon_name[] = {
97	"n", "ne", "e", "se", "s", "sw", "w", "nw", "none", NULL
98	};
99
100	/* ICON_WPT */
101	const char *wpt_sym_icon_name[] = {
102	"multistage", "parking", "final", "question",
103	"trailhead", "refpoint", NULL
104	};
105
106	/* ICON_TB */
107	const char *tb_icon_name[] = {
108	"tb", "coin", NULL
109	};
110
111	/* ICON_MISC */
112	const char *misc_icon_name[] = {
113	"32x32/locked", "32x32/unlocked", "32x32/delete",
114	#ifdef FREMANTLE
115	"64x64/paypal",
116	#else
117	"32x32/paypal",
118	#endif
119	"32x32/pos_geomath",
120	#ifdef FREMANTLE
121	"64x64/gpxview",
122	#else
123	"32x32/gpxview",
124	#endif
125	#ifndef USE_MAEMO
126	"16x16/speaker", "16x16/speaker_off",
127	#else
128	#ifndef FREMANTLE
129	"24x24/speaker", "24x24/speaker_off",
130	#else
131	"32x32/speaker", "32x32/speaker_off",
132	#endif
133	#endif
134
135	NULL
136	};
137
138	/* ICON_POS */
139	const char *pos_icon_name[] = {
140	"wpt_multistage", "wpt_parking", "wpt_final",
141	"wpt_question", "wpt_trailhead", "wpt_refpoint",
142
143	"cache_type_traditional", "cache_type_multi", "cache_type_mystery",
144	"cache_type_virtual", "cache_type_webcam", "cache_type_event",
145	"cache_type_letterbox", "cache_type_earthcache", "cache_type_wherigo",
146	"cache_type_megaevent", "cache_type_cito",
147
148	"pos_wpt", "pos_gps", "pos_geomath", "pos_map", "pos_home",
149
150	"pos_get", "pos_set", "maemo-mapper", "clipboard",
151
152	NULL
153	};
154
155	/* ICON_FILE */
156	const char *file_icon_name[] = {
157	"gc", "folder", "zip", NULL
158	};
159
160	static void icons_load(int type, char format, const char names[]) {
161	int i;
162
163	if(!icons[type].count) {
164	icons[type].data = NULL;
165	return;
166	}
167
168	icons[type].data = malloc(sizeof(GdkPixbuf ) icons[type].count);
169
170	for(i=0;i<icons[type].count;i++) {
171	g_assert(names[i]);
172
173	GError *error = NULL;
174	char filename[128];
175	strcpy(filename, ICONPATH);
176	snprintf(filename+strlen(filename),
177	sizeof(filename)-strlen(filename), format, names[i], "png");
178	icons[type].data[i] = gdk_pixbuf_new_from_file(filename, &error);
179
180	if(error) {
181	error = NULL;
182	/* try again in local dir */
183	strcpy(filename, "./data/icons/");
184	snprintf(filename+strlen(filename),
185	sizeof(filename)-strlen(filename), format, names[i], "png");
186	icons[type].data[i] = gdk_pixbuf_new_from_file(filename, &error);
187
188	if(error) {
189	icons[type].data[i] = NULL;
190	g_warning("Could not load icon %s: %s\n", names[i], error->message);
191	g_error_free(error);
192	error = NULL;
193	}
194	}
195	}
196
197	g_assert(!names[i]);
198	}
199
200	void icons_init(void) {
201
202	/* load cache type icons */
203	icons_load(ICON_CACHE_TYPE, "32x32/cache_type_%s.%s", cache_type_icon_name);
204
205	/* load semitransparent cache type icons */
206	icons_load(ICON_CACHE_TYPE_SEMI, "32x32/cache_type_%s_semi.%s", cache_type_icon_name);
207
208	/* load 150% sized cache type icons */
209	icons_load(ICON_CACHE_TYPE_1_5X, "48x48/cache_type_%s.%s", cache_type_icon_name);
210
211	/* load double sized cache type icons */
212	icons_load(ICON_CACHE_TYPE_2X, "64x64/cache_type_%s.%s", cache_type_icon_name);
213
214	/* load cache container/size icons */
215	#if !defined(USE_MAEMO) \|\| (MAEMO_VERSION_MAJOR < 5)
216	icons_load(ICON_CACHE_SIZE, "45x12/cache_size_%s.%s", cache_size_icon_name);
217	#else
218	icons_load(ICON_CACHE_SIZE, "90x24/cache_size_%s.%s", cache_size_icon_name);
219	#endif
220
221	/* load cache difficulty/terrain/quality icons */
222	#if !defined(USE_MAEMO) \|\| (MAEMO_VERSION_MAJOR < 5)
223	icons_load(ICON_STARS, "12x12/stars%s.%s", stars_icon_name);
224	#else
225	icons_load(ICON_STARS, "16x16/stars%s.%s", stars_icon_name);
226	#endif
227
228	/* load cache log icons */
229	icons_load(ICON_LOG, "32x32/log_icon_%s.%s", log_icon_name);
230
231	/* load icons to visualize heading */
232	#if !defined(USE_MAEMO) \|\| (MAEMO_VERSION_MAJOR < 5)
233	icons_load(ICON_HEADING, "32x32/heading_%s.%s", heading_icon_name);
234	#else
235	icons_load(ICON_HEADING, "48x48/heading_%s.%s", heading_icon_name);
236	#endif
237
238	/* load waypoint icons */
239	icons_load(ICON_WPT, "32x32/wpt_%s.%s", wpt_sym_icon_name);
240
241	/* load travelbug/coin icons */
242	icons_load(ICON_TB, "32x32/%s.%s", tb_icon_name);
243
244	/* load misc icons */
245	icons_load(ICON_MISC, "%s.%s", misc_icon_name);
246
247	/* load pos icons */
248	#if !defined(USE_MAEMO)
249	icons_load(ICON_POS, "16x16/%s.%s", pos_icon_name);
250	#else
251	#if (MAEMO_VERSION_MAJOR < 5)
252	icons_load(ICON_POS, "24x24/%s.%s", pos_icon_name);
253	#else
254	icons_load(ICON_POS, "32x32/%s.%s", pos_icon_name);
255	#endif
256	#endif
257
258	/* load file icons */
259	icons_load(ICON_FILE, "32x32/file_%s.%s", file_icon_name);
260
261	/* load attribute icons */
262	icons_load(ICON_ATT, "32x32/att_%s.%s", att_icon_name);
263	}
264
265	void icons_free(void) {
266	int i;
267	struct icon_data *icon = icons;
268
269	while(icon->count >= 0) {
270	if(icon->count) {
271	for(i=0;i<icon->count;i++)
272	if(icon->data[i])
273	gdk_pixbuf_unref(icon->data[i]);
274
275	free(icon->data);
276	}
277
278	icon++;
279	}
280	}
281
282	GdkPixbuf *icon_get(int type, int num) {
283	if(num < 0) return NULL;
284	if(num >= icons[type].count) return NULL;
285
286	return icons[type].data[num];
287	}
288
289	GtkWidget *icon_get_widget(int type, int num) {
290	GdkPixbuf *pbuf = icon_get(type, num);
291	if(!pbuf) return NULL;
292
293	return gtk_image_new_from_pixbuf(pbuf);
294	}
295
296	/* routine to overlay two pixbufs */
297	GdkPixbuf pixbuf_overlay(GdkPixbuf bot, GdkPixbuf *top) {
298	GdkPixbuf *pix = gdk_pixbuf_copy(bot);
299
300	gdk_pixbuf_composite(top, pix,
301	0, 0, gdk_pixbuf_get_width(bot), gdk_pixbuf_get_height(bot),
302	0.0, 0.0, 1.0, 1.0, GDK_INTERP_NEAREST, 255);
303
304	return pix;
305	}
306
307	GtkWidget *icon_get_widget_ovl(int type, int num, int ovl) {
308	GdkPixbuf *pbuf0 = icon_get(type, num);
309	GdkPixbuf *pbuf1 = icon_get(type, ovl);
310	if(!pbuf0 \|\| !pbuf1) return NULL;
311
312	GdkPixbuf *pbuf = pixbuf_overlay(pbuf0, pbuf1);
313	GtkWidget *widget = gtk_image_new_from_pixbuf(pbuf);
314
315	/* widget now holds a reference */
316	gdk_pixbuf_unref(pbuf);
317
318	return widget;
319	}
320
321	GdkPixbuf *icon_bearing(pos_t from, pos_t to) {
322	if(isnan(from.lat) \|\| isnan(from.lon) \|\|
323	isnan(to.lat) \|\| isnan(to.lon))
324	return icon_get(ICON_HEADING, 8);
325
326	int idx = (gpx_pos_get_bearing(from, to)+22.5)/45.0;
327
328	/* make sure we stay in icon bounds */
329	if(idx < 0) idx += 8;
330	if(idx > 7) idx -= 8;
331	return icon_get(ICON_HEADING, idx);
332	}
333