[andy/viking.git] / src / vikslippymapsource.c

/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*- */
/*
 * viking
 * Copyright (C) Guilhem Bonnefille 2009 <guilhem.bonnefille@gmail.com>
 * 
 * viking 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.
 * 
 * viking 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifdef HAVE_MATH_H
#include <math.h>
#endif

#include "globals.h"
#include "vikslippymapsource.h"

static gboolean _coord_to_mapcoord ( VikMapSource *self, const VikCoord *src, gdouble xzoom, gdouble yzoom, MapCoord *dest );
static void _mapcoord_to_center_coord ( VikMapSource *self, MapCoord *src, VikCoord *dest );
static int _download ( VikMapSource *self, MapCoord *src, const gchar *dest_fn );

static gchar *_get_uri( VikSlippyMapSource *self, MapCoord *src );
static gchar *_get_hostname( VikSlippyMapSource *self );
static DownloadOptions *_get_download_options( VikSlippyMapSource *self );

/* FIXME Huge gruik */
static DownloadOptions slippy_options = { NULL, 0, a_check_map_file };

typedef struct _VikSlippyMapSourcePrivate VikSlippyMapSourcePrivate;
struct _VikSlippyMapSourcePrivate
{
  gchar *hostname;
  gchar *url;
};

#define VIK_SLIPPY_MAP_SOURCE_PRIVATE(o)  (G_TYPE_INSTANCE_GET_PRIVATE ((o), VIK_TYPE_SLIPPY_MAP_SOURCE, VikSlippyMapSourcePrivate))

/* properties */
enum
{
  PROP_0,

  PROP_HOSTNAME,
  PROP_URL,
};

G_DEFINE_TYPE_EXTENDED (VikSlippyMapSource, vik_slippy_map_source, VIK_TYPE_MAP_SOURCE_DEFAULT, (GTypeFlags)0,);

static void
vik_slippy_map_source_init (VikSlippyMapSource *self)
{
  /* initialize the object here */
  VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE (self);

  priv->hostname = NULL;
  priv->url = NULL;

  g_object_set (G_OBJECT (self),
                "tilesize-x", 256,
                "tilesize-y", 256,
                "drawmode", VIK_VIEWPORT_DRAWMODE_MERCATOR,
                NULL);
}

static void
vik_slippy_map_source_finalize (GObject *object)
{
  VikSlippyMapSource *self = VIK_SLIPPY_MAP_SOURCE (object);
  VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE (self);

  g_free (priv->hostname);
  priv->hostname = NULL;
  g_free (priv->url);
  priv->url = NULL;

  G_OBJECT_CLASS (vik_slippy_map_source_parent_class)->finalize (object);
}

static void
vik_slippy_map_source_set_property (GObject      *object,
                                    guint         property_id,
                                    const GValue *value,
                                    GParamSpec   *pspec)
{
  VikSlippyMapSource *self = VIK_SLIPPY_MAP_SOURCE (object);
  VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE (self);

  switch (property_id)
    {
    case PROP_HOSTNAME:
      g_free (priv->hostname);
      priv->hostname = g_value_dup_string (value);
      break;

    case PROP_URL:
      g_free (priv->url);
      priv->url = g_value_dup_string (value);
      break;

    default:
      /* We don't have any other property... */
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
      break;
    }
}

static void
vik_slippy_map_source_get_property (GObject    *object,
                                    guint       property_id,
                                    GValue     *value,
                                    GParamSpec *pspec)
{
  VikSlippyMapSource *self = VIK_SLIPPY_MAP_SOURCE (object);
  VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE (self);

  switch (property_id)
    {
    case PROP_HOSTNAME:
      g_value_set_string (value, priv->hostname);
      break;

    case PROP_URL:
      g_value_set_string (value, priv->url);
      break;

    default:
      /* We don't have any other property... */
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
      break;
    }
}

static void
vik_slippy_map_source_class_init (VikSlippyMapSourceClass *klass)
{
	GObjectClass* object_class = G_OBJECT_CLASS (klass);
	VikMapSourceClass* parent_class = VIK_MAP_SOURCE_CLASS (klass);
	GParamSpec *pspec = NULL;
		
	object_class->set_property = vik_slippy_map_source_set_property;
    object_class->get_property = vik_slippy_map_source_get_property;

	/* Overiding methods */
	parent_class->coord_to_mapcoord =        _coord_to_mapcoord;
	parent_class->mapcoord_to_center_coord = _mapcoord_to_center_coord;
	parent_class->download =                 _download;
	
	/* Default implementation of methods */
	klass->get_uri = _get_uri;
	klass->get_hostname = _get_hostname;
	klass->get_download_options = _get_download_options;

	pspec = g_param_spec_string ("hostname",
	                             "Hostname",
	                             "The hostname of the map server",
	                             "<no-set>" /* default value */,
	                             G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE);
	g_object_class_install_property (object_class, PROP_HOSTNAME, pspec);

	pspec = g_param_spec_string ("url",
	                             "URL",
	                             "The template of the tiles' URL",
	                             "<no-set>" /* default value */,
	                             G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE);
	g_object_class_install_property (object_class, PROP_URL, pspec);
	
	g_type_class_add_private (klass, sizeof (VikSlippyMapSourcePrivate));
	
	object_class->finalize = vik_slippy_map_source_finalize;
}

/* 1 << (x) is like a 2**(x) */
#define GZ(x) ((1<<x))

static const gdouble scale_mpps[] = { GZ(0), GZ(1), GZ(2), GZ(3), GZ(4), GZ(5), GZ(6), GZ(7), GZ(8), GZ(9),
                                           GZ(10), GZ(11), GZ(12), GZ(13), GZ(14), GZ(15), GZ(16), GZ(17) };

static const gint num_scales = (sizeof(scale_mpps) / sizeof(scale_mpps[0]));

#define ERROR_MARGIN 0.01
static guint8 slippy_zoom ( gdouble mpp ) {
  gint i;
  for ( i = 0; i < num_scales; i++ ) {
    if ( ABS(scale_mpps[i] - mpp) < ERROR_MARGIN )
      return i;
  }
  return 255;
}

gchar *
vik_slippy_map_source_get_uri( VikSlippyMapSource *self, MapCoord *src )
{
	VikSlippyMapSourceClass *klass;
	g_return_val_if_fail (self != NULL, 0);
	g_return_val_if_fail (VIK_IS_SLIPPY_MAP_SOURCE (self), 0);
	klass = VIK_SLIPPY_MAP_SOURCE_GET_CLASS(self);

	g_return_val_if_fail (klass->get_uri != NULL, 0);

	return (*klass->get_uri)(self, src);
}

gchar *
vik_slippy_map_source_get_hostname( VikSlippyMapSource *self )
{
	VikSlippyMapSourceClass *klass;
	g_return_val_if_fail (self != NULL, 0);
	g_return_val_if_fail (VIK_IS_SLIPPY_MAP_SOURCE (self), 0);
	klass = VIK_SLIPPY_MAP_SOURCE_GET_CLASS(self);

	g_return_val_if_fail (klass->get_hostname != NULL, 0);

	return (*klass->get_hostname)(self);
}

DownloadOptions *
vik_slippy_map_source_get_download_options( VikSlippyMapSource *self )
{
	VikSlippyMapSourceClass *klass;
	g_return_val_if_fail (self != NULL, 0);
	g_return_val_if_fail (VIK_IS_SLIPPY_MAP_SOURCE (self), 0);
	klass = VIK_SLIPPY_MAP_SOURCE_GET_CLASS(self);

	g_return_val_if_fail (klass->get_download_options != NULL, 0);

	return (*klass->get_download_options)(self);
}

static gboolean
_coord_to_mapcoord ( VikMapSource *self, const VikCoord *src, gdouble xzoom, gdouble yzoom, MapCoord *dest )
{
  g_assert ( src->mode == VIK_COORD_LATLON );

  if ( xzoom != yzoom )
    return FALSE;

  dest->scale = slippy_zoom ( xzoom );
  if ( dest->scale == 255 )
    return FALSE;

  dest->x = (src->east_west + 180) / 360 * GZ(17) / xzoom;
  dest->y = (180 - MERCLAT(src->north_south)) / 360 * GZ(17) / xzoom;
  dest->z = 0;

  return TRUE;
}

static void
_mapcoord_to_center_coord ( VikMapSource *self, MapCoord *src, VikCoord *dest )
{
  gdouble socalled_mpp = GZ(src->scale);
  dest->mode = VIK_COORD_LATLON;
  dest->east_west = ((src->x+0.5) / GZ(17) * socalled_mpp * 360) - 180;
  dest->north_south = DEMERCLAT(180 - ((src->y+0.5) / GZ(17) * socalled_mpp * 360));
}

static int
_download ( VikMapSource *self, MapCoord *src, const gchar *dest_fn )
{
   int res;
   gchar *uri = vik_slippy_map_source_get_uri(VIK_SLIPPY_MAP_SOURCE(self), src);
   gchar *host = vik_slippy_map_source_get_hostname(VIK_SLIPPY_MAP_SOURCE(self));
   DownloadOptions *options = vik_slippy_map_source_get_download_options(VIK_SLIPPY_MAP_SOURCE(self));
   res = a_http_download_get_url ( host, uri, dest_fn, options );
   g_free ( uri );
   g_free ( host );
   return res;
}

static gchar *
_get_uri( VikSlippyMapSource *self, MapCoord *src )
{
	g_return_val_if_fail (VIK_IS_SLIPPY_MAP_SOURCE(self), NULL);
	
    VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE(self);
	gchar *uri = g_strdup_printf (priv->url, 17 - src->scale, src->x, src->y);
	return uri;
} 

static gchar *
_get_hostname( VikSlippyMapSource *self )
{
	g_return_val_if_fail (VIK_IS_SLIPPY_MAP_SOURCE(self), NULL);
	
    VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE(self);
	return g_strdup( priv->hostname );
}

static DownloadOptions *
_get_download_options( VikSlippyMapSource *self )
{
	g_return_val_if_fail (VIK_IS_SLIPPY_MAP_SOURCE(self), NULL);
	
	return &slippy_options;
}

VikSlippyMapSource *
vik_slippy_map_source_new_with_id (guint8 id, const gchar *label, const gchar *hostname, const gchar *url)
{
	return g_object_new(VIK_TYPE_SLIPPY_MAP_SOURCE,
	                    "id", id, "label", label, "hostname", hostname, "url", url, NULL);
}
Commit	Line	Data
e3a90009 GB	1	/* -- Mode: C; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -- */
	2	/*
	3	* viking
	4	* Copyright (C) Guilhem Bonnefille 2009 <guilhem.bonnefille@gmail.com>
	5	*
	6	* viking is free software: you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License as published by the
	8	* Free Software Foundation, either version 3 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* viking is distributed in the hope that it will be useful, but
	12	* WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
	14	* See the GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License along
	17	* with this program. If not, see <http://www.gnu.org/licenses/>.
	18	*/
	19	#ifdef HAVE_CONFIG_H
	20	#include "config.h"
	21	#endif
	22
	23	#ifdef HAVE_MATH_H
	24	#include <math.h>
	25	#endif
	26
	27	#include "globals.h"
8eb12ac6	28	#include "vikslippymapsource.h"
e3a90009 GB	29
	30	static gboolean _coord_to_mapcoord ( VikMapSource self, const VikCoord src, gdouble xzoom, gdouble yzoom, MapCoord *dest );
	31	static void _mapcoord_to_center_coord ( VikMapSource self, MapCoord src, VikCoord *dest );
	32	static int _download ( VikMapSource self, MapCoord src, const gchar *dest_fn );
	33
8eb12ac6 GB	34	static gchar _get_uri( VikSlippyMapSource self, MapCoord *src );
	35	static gchar _get_hostname( VikSlippyMapSource self );
	36	static DownloadOptions _get_download_options( VikSlippyMapSource self );
e3a90009	37
8eb12ac6 GB	38	/* FIXME Huge gruik */
	39	static DownloadOptions slippy_options = { NULL, 0, a_check_map_file };
	40
	41	typedef struct _VikSlippyMapSourcePrivate VikSlippyMapSourcePrivate;
	42	struct _VikSlippyMapSourcePrivate
	43	{
	44	gchar *hostname;
	45	gchar *url;
	46	};
	47
	48	#define VIK_SLIPPY_MAP_SOURCE_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), VIK_TYPE_SLIPPY_MAP_SOURCE, VikSlippyMapSourcePrivate))
	49
4e53f3dc GB	50	/* properties */
	51	enum
	52	{
	53	PROP_0,
	54
	55	PROP_HOSTNAME,
	56	PROP_URL,
	57	};
	58
8eb12ac6	59	G_DEFINE_TYPE_EXTENDED (VikSlippyMapSource, vik_slippy_map_source, VIK_TYPE_MAP_SOURCE_DEFAULT, (GTypeFlags)0,);
e3a90009 GB	60
e3a90009 GB	61	static void
3a84e537	62	vik_slippy_map_source_init (VikSlippyMapSource *self)
e3a90009	63	{
9cca9d93 GB	64	/* initialize the object here */
	65	VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE (self);
	66
	67	priv->hostname = NULL;
	68	priv->url = NULL;
	69
	70	g_object_set (G_OBJECT (self),
	71	"tilesize-x", 256,
	72	"tilesize-y", 256,
	73	"drawmode", VIK_VIEWPORT_DRAWMODE_MERCATOR,
	74	NULL);
e3a90009 GB	75	}
	76
	77	static void
8eb12ac6	78	vik_slippy_map_source_finalize (GObject *object)
e3a90009	79	{
9cca9d93 GB	80	VikSlippyMapSource *self = VIK_SLIPPY_MAP_SOURCE (object);
	81	VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE (self);
	82
	83	g_free (priv->hostname);
	84	priv->hostname = NULL;
	85	g_free (priv->url);
	86	priv->url = NULL;
e3a90009	87
9cca9d93	88	G_OBJECT_CLASS (vik_slippy_map_source_parent_class)->finalize (object);
e3a90009 GB	89	}
e3a90009 GB	90
4e53f3dc GB	91	static void
	92	vik_slippy_map_source_set_property (GObject *object,
	93	guint property_id,
	94	const GValue *value,
	95	GParamSpec *pspec)
	96	{
	97	VikSlippyMapSource *self = VIK_SLIPPY_MAP_SOURCE (object);
	98	VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE (self);
	99
	100	switch (property_id)
	101	{
	102	case PROP_HOSTNAME:
	103	g_free (priv->hostname);
	104	priv->hostname = g_value_dup_string (value);
	105	break;
	106
	107	case PROP_URL:
	108	g_free (priv->url);
	109	priv->url = g_value_dup_string (value);
	110	break;
	111
	112	default:
	113	/* We don't have any other property... */
	114	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
	115	break;
	116	}
	117	}
	118
	119	static void
	120	vik_slippy_map_source_get_property (GObject *object,
	121	guint property_id,
	122	GValue *value,
	123	GParamSpec *pspec)
	124	{
	125	VikSlippyMapSource *self = VIK_SLIPPY_MAP_SOURCE (object);
	126	VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE (self);
	127
	128	switch (property_id)
	129	{
	130	case PROP_HOSTNAME:
	131	g_value_set_string (value, priv->hostname);
	132	break;
	133
	134	case PROP_URL:
	135	g_value_set_string (value, priv->url);
	136	break;
	137
	138	default:
	139	/* We don't have any other property... */
	140	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
	141	break;
	142	}
	143	}
	144
e3a90009	145	static void
8eb12ac6	146	vik_slippy_map_source_class_init (VikSlippyMapSourceClass *klass)
e3a90009 GB	147	{
	148	GObjectClass* object_class = G_OBJECT_CLASS (klass);
	149	VikMapSourceClass* parent_class = VIK_MAP_SOURCE_CLASS (klass);
4e53f3dc GB	150	GParamSpec *pspec = NULL;
	151
	152	object_class->set_property = vik_slippy_map_source_set_property;
	153	object_class->get_property = vik_slippy_map_source_get_property;
e3a90009 GB	154
	155	/* Overiding methods */
	156	parent_class->coord_to_mapcoord = _coord_to_mapcoord;
	157	parent_class->mapcoord_to_center_coord = _mapcoord_to_center_coord;
	158	parent_class->download = _download;
8eb12ac6 GB	159
	160	/* Default implementation of methods */
	161	klass->get_uri = _get_uri;
	162	klass->get_hostname = _get_hostname;
	163	klass->get_download_options = _get_download_options;
4e53f3dc GB	164
	165	pspec = g_param_spec_string ("hostname",
	166	"Hostname",
	167	"The hostname of the map server",
	168	"<no-set>" /* default value */,
	169	G_PARAM_CONSTRUCT_ONLY \| G_PARAM_READWRITE);
	170	g_object_class_install_property (object_class, PROP_HOSTNAME, pspec);
	171
	172	pspec = g_param_spec_string ("url",
	173	"URL",
	174	"The template of the tiles' URL",
	175	"<no-set>" /* default value */,
	176	G_PARAM_CONSTRUCT_ONLY \| G_PARAM_READWRITE);
	177	g_object_class_install_property (object_class, PROP_URL, pspec);
8eb12ac6 GB	178
	179	g_type_class_add_private (klass, sizeof (VikSlippyMapSourcePrivate));
	180
	181	object_class->finalize = vik_slippy_map_source_finalize;
e3a90009 GB	182	}
	183
	184	/* 1 << (x) is like a 2*(x) /
	185	#define GZ(x) ((1<<x))
	186
	187	static const gdouble scale_mpps[] = { GZ(0), GZ(1), GZ(2), GZ(3), GZ(4), GZ(5), GZ(6), GZ(7), GZ(8), GZ(9),
	188	GZ(10), GZ(11), GZ(12), GZ(13), GZ(14), GZ(15), GZ(16), GZ(17) };
	189
	190	static const gint num_scales = (sizeof(scale_mpps) / sizeof(scale_mpps[0]));
	191
	192	#define ERROR_MARGIN 0.01
	193	static guint8 slippy_zoom ( gdouble mpp ) {
	194	gint i;
	195	for ( i = 0; i < num_scales; i++ ) {
	196	if ( ABS(scale_mpps[i] - mpp) < ERROR_MARGIN )
	197	return i;
	198	}
	199	return 255;
	200	}
	201
	202	gchar *
8eb12ac6	203	vik_slippy_map_source_get_uri( VikSlippyMapSource self, MapCoord src )
e3a90009	204	{
8eb12ac6	205	VikSlippyMapSourceClass *klass;
e3a90009	206	g_return_val_if_fail (self != NULL, 0);
8eb12ac6 GB	207	g_return_val_if_fail (VIK_IS_SLIPPY_MAP_SOURCE (self), 0);
8eb12ac6 GB	208	klass = VIK_SLIPPY_MAP_SOURCE_GET_CLASS(self);
e3a90009 GB	209
	210	g_return_val_if_fail (klass->get_uri != NULL, 0);
	211
	212	return (*klass->get_uri)(self, src);
	213	}
	214
	215	gchar *
8eb12ac6	216	vik_slippy_map_source_get_hostname( VikSlippyMapSource *self )
e3a90009	217	{
8eb12ac6	218	VikSlippyMapSourceClass *klass;
e3a90009	219	g_return_val_if_fail (self != NULL, 0);
8eb12ac6 GB	220	g_return_val_if_fail (VIK_IS_SLIPPY_MAP_SOURCE (self), 0);
8eb12ac6 GB	221	klass = VIK_SLIPPY_MAP_SOURCE_GET_CLASS(self);
e3a90009 GB	222
	223	g_return_val_if_fail (klass->get_hostname != NULL, 0);
	224
	225	return (*klass->get_hostname)(self);
	226	}
	227
	228	DownloadOptions *
8eb12ac6	229	vik_slippy_map_source_get_download_options( VikSlippyMapSource *self )
e3a90009	230	{
8eb12ac6	231	VikSlippyMapSourceClass *klass;
e3a90009	232	g_return_val_if_fail (self != NULL, 0);
8eb12ac6 GB	233	g_return_val_if_fail (VIK_IS_SLIPPY_MAP_SOURCE (self), 0);
8eb12ac6 GB	234	klass = VIK_SLIPPY_MAP_SOURCE_GET_CLASS(self);
e3a90009 GB	235
	236	g_return_val_if_fail (klass->get_download_options != NULL, 0);
	237
	238	return (*klass->get_download_options)(self);
	239	}
	240
	241	static gboolean
	242	_coord_to_mapcoord ( VikMapSource self, const VikCoord src, gdouble xzoom, gdouble yzoom, MapCoord *dest )
	243	{
	244	g_assert ( src->mode == VIK_COORD_LATLON );
	245
	246	if ( xzoom != yzoom )
	247	return FALSE;
	248
	249	dest->scale = slippy_zoom ( xzoom );
	250	if ( dest->scale == 255 )
	251	return FALSE;
	252
	253	dest->x = (src->east_west + 180) / 360 * GZ(17) / xzoom;
	254	dest->y = (180 - MERCLAT(src->north_south)) / 360 * GZ(17) / xzoom;
	255	dest->z = 0;
	256
	257	return TRUE;
	258	}
	259
	260	static void
	261	_mapcoord_to_center_coord ( VikMapSource self, MapCoord src, VikCoord *dest )
	262	{
	263	gdouble socalled_mpp = GZ(src->scale);
	264	dest->mode = VIK_COORD_LATLON;
	265	dest->east_west = ((src->x+0.5) / GZ(17) * socalled_mpp * 360) - 180;
	266	dest->north_south = DEMERCLAT(180 - ((src->y+0.5) / GZ(17) * socalled_mpp * 360));
	267	}
	268
	269	static int
	270	_download ( VikMapSource self, MapCoord src, const gchar *dest_fn )
	271	{
	272	int res;
8eb12ac6 GB	273	gchar *uri = vik_slippy_map_source_get_uri(VIK_SLIPPY_MAP_SOURCE(self), src);
	274	gchar *host = vik_slippy_map_source_get_hostname(VIK_SLIPPY_MAP_SOURCE(self));
	275	DownloadOptions *options = vik_slippy_map_source_get_download_options(VIK_SLIPPY_MAP_SOURCE(self));
e3a90009 GB	276	res = a_http_download_get_url ( host, uri, dest_fn, options );
	277	g_free ( uri );
	278	g_free ( host );
	279	return res;
	280	}
8eb12ac6 GB	281
	282	static gchar *
	283	_get_uri( VikSlippyMapSource self, MapCoord src )
	284	{
	285	g_return_val_if_fail (VIK_IS_SLIPPY_MAP_SOURCE(self), NULL);
	286
	287	VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE(self);
	288	gchar *uri = g_strdup_printf (priv->url, 17 - src->scale, src->x, src->y);
	289	return uri;
	290	}
	291
	292	static gchar *
	293	_get_hostname( VikSlippyMapSource *self )
	294	{
	295	g_return_val_if_fail (VIK_IS_SLIPPY_MAP_SOURCE(self), NULL);
	296
	297	VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE(self);
	298	return g_strdup( priv->hostname );
	299	}
	300
	301	static DownloadOptions *
	302	_get_download_options( VikSlippyMapSource *self )
	303	{
	304	g_return_val_if_fail (VIK_IS_SLIPPY_MAP_SOURCE(self), NULL);
	305
	306	return &slippy_options;
	307	}
	308
	309	VikSlippyMapSource *
db03733a	310	vik_slippy_map_source_new_with_id (guint8 id, const gchar label, const gchar hostname, const gchar *url)
8eb12ac6	311	{
4e53f3dc	312	return g_object_new(VIK_TYPE_SLIPPY_MAP_SOURCE,
db03733a	313	"id", id, "label", label, "hostname", hostname, "url", url, NULL);
8eb12ac6	314	}