[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 gboolean _supports_if_modified_since (VikMapSource *self );

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

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

#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,
  PROP_REFERER,
  PROP_FOLLOW_LOCATION,
  PROP_CHECK_FILE_SERVER_TIME,
};

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;
  priv->options.referer = NULL;
  priv->options.follow_location = 0;
  priv->options.check_file = a_check_map_file;
  priv->options.check_file_server_time = 0;

  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_free (priv->options.referer);
  priv->options.referer = 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;

    case PROP_REFERER:
      g_free (priv->options.referer);
      priv->options.referer = g_value_dup_string (value);
      break;

    case PROP_FOLLOW_LOCATION:
      priv->options.follow_location = g_value_get_long (value);
      break;

    case PROP_CHECK_FILE_SERVER_TIME:
      priv->options.check_file_server_time = g_value_get_uint (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;

    case PROP_REFERER:
      g_value_set_string (value, priv->options.referer);
      break;

    case PROP_FOLLOW_LOCATION:
      g_value_set_long (value, priv->options.follow_location);
      break;

    case PROP_CHECK_FILE_SERVER_TIME:
      g_value_set_uint (value, priv->options.check_file_server_time);
      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;
	parent_class->supports_if_modified_since = _supports_if_modified_since;
	
	/* 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);

	pspec = g_param_spec_string ("referer",
	                             "Referer",
	                             "The REFERER string to use in HTTP request",
	                             NULL /* default value */,
	                             G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE);
	g_object_class_install_property (object_class, PROP_REFERER, pspec);
	
	pspec = g_param_spec_long ("follow-location",
	                           "Follow location",
                               "Specifies the number of retries to follow a redirect while downloading a page",
                               0  /* minimum value */,
                               G_MAXLONG /* maximum value */,
                               0  /* default value */,
                               G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE);
	g_object_class_install_property (object_class, PROP_FOLLOW_LOCATION, pspec);
	
	pspec = g_param_spec_uint ("check-file-server-time",
	                           "Check file server time",
                               "Age of current cache before redownloading tile",
                               0  /* minimum value */,
                               G_MAXUINT16 /* maximum value */,
                               0  /* default value */,
                               G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE);
	g_object_class_install_property (object_class, PROP_CHECK_FILE_SERVER_TIME, 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);
}

gboolean
_supports_if_modified_since (VikMapSource *self)
{
	g_return_val_if_fail (VIK_IS_SLIPPY_MAP_SOURCE(self), FALSE);
	
    VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE(self);
	
	g_debug ("%s: priv->options.check_file_server_time = %d", __FUNCTION__, priv->options.check_file_server_time);
	
	return priv->options.check_file_server_time != 0;
}
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);
	
	VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE(self);
	return &(priv->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 );
0f08bd0d	33	static gboolean _supports_if_modified_since (VikMapSource *self );
e3a90009	34
8eb12ac6 GB	35	static gchar _get_uri( VikSlippyMapSource self, MapCoord *src );
	36	static gchar _get_hostname( VikSlippyMapSource self );
	37	static DownloadOptions _get_download_options( VikSlippyMapSource self );
e3a90009	38
8eb12ac6 GB	39	typedef struct _VikSlippyMapSourcePrivate VikSlippyMapSourcePrivate;
	40	struct _VikSlippyMapSourcePrivate
	41	{
	42	gchar *hostname;
	43	gchar *url;
c395c6a5	44	DownloadOptions options;
8eb12ac6 GB	45	};
	46
	47	#define VIK_SLIPPY_MAP_SOURCE_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), VIK_TYPE_SLIPPY_MAP_SOURCE, VikSlippyMapSourcePrivate))
	48
4e53f3dc GB	49	/* properties */
	50	enum
	51	{
	52	PROP_0,
	53
	54	PROP_HOSTNAME,
	55	PROP_URL,
c395c6a5 GB	56	PROP_REFERER,
c395c6a5 GB	57	PROP_FOLLOW_LOCATION,
0f08bd0d	58	PROP_CHECK_FILE_SERVER_TIME,
4e53f3dc GB	59	};
4e53f3dc GB	60
8eb12ac6	61	G_DEFINE_TYPE_EXTENDED (VikSlippyMapSource, vik_slippy_map_source, VIK_TYPE_MAP_SOURCE_DEFAULT, (GTypeFlags)0,);
e3a90009 GB	62
e3a90009 GB	63	static void
3a84e537	64	vik_slippy_map_source_init (VikSlippyMapSource *self)
e3a90009	65	{
9cca9d93 GB	66	/* initialize the object here */
	67	VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE (self);
	68
	69	priv->hostname = NULL;
	70	priv->url = NULL;
c395c6a5 GB	71	priv->options.referer = NULL;
	72	priv->options.follow_location = 0;
	73	priv->options.check_file = a_check_map_file;
0f08bd0d	74	priv->options.check_file_server_time = 0;
9cca9d93 GB	75
	76	g_object_set (G_OBJECT (self),
	77	"tilesize-x", 256,
	78	"tilesize-y", 256,
	79	"drawmode", VIK_VIEWPORT_DRAWMODE_MERCATOR,
	80	NULL);
e3a90009 GB	81	}
	82
	83	static void
8eb12ac6	84	vik_slippy_map_source_finalize (GObject *object)
e3a90009	85	{
9cca9d93 GB	86	VikSlippyMapSource *self = VIK_SLIPPY_MAP_SOURCE (object);
	87	VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE (self);
	88
	89	g_free (priv->hostname);
	90	priv->hostname = NULL;
	91	g_free (priv->url);
	92	priv->url = NULL;
c395c6a5 GB	93	g_free (priv->options.referer);
c395c6a5 GB	94	priv->options.referer = NULL;
e3a90009	95
9cca9d93	96	G_OBJECT_CLASS (vik_slippy_map_source_parent_class)->finalize (object);
e3a90009 GB	97	}
e3a90009 GB	98
4e53f3dc GB	99	static void
	100	vik_slippy_map_source_set_property (GObject *object,
	101	guint property_id,
	102	const GValue *value,
	103	GParamSpec *pspec)
	104	{
	105	VikSlippyMapSource *self = VIK_SLIPPY_MAP_SOURCE (object);
	106	VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE (self);
	107
	108	switch (property_id)
	109	{
	110	case PROP_HOSTNAME:
	111	g_free (priv->hostname);
	112	priv->hostname = g_value_dup_string (value);
	113	break;
	114
	115	case PROP_URL:
	116	g_free (priv->url);
	117	priv->url = g_value_dup_string (value);
	118	break;
	119
c395c6a5 GB	120	case PROP_REFERER:
	121	g_free (priv->options.referer);
	122	priv->options.referer = g_value_dup_string (value);
	123	break;
	124
	125	case PROP_FOLLOW_LOCATION:
	126	priv->options.follow_location = g_value_get_long (value);
	127	break;
	128
0f08bd0d GB	129	case PROP_CHECK_FILE_SERVER_TIME:
	130	priv->options.check_file_server_time = g_value_get_uint (value);
	131	break;
	132
4e53f3dc GB	133	default:
	134	/* We don't have any other property... */
	135	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
	136	break;
	137	}
	138	}
	139
	140	static void
	141	vik_slippy_map_source_get_property (GObject *object,
	142	guint property_id,
	143	GValue *value,
	144	GParamSpec *pspec)
	145	{
	146	VikSlippyMapSource *self = VIK_SLIPPY_MAP_SOURCE (object);
	147	VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE (self);
	148
	149	switch (property_id)
	150	{
	151	case PROP_HOSTNAME:
	152	g_value_set_string (value, priv->hostname);
	153	break;
	154
	155	case PROP_URL:
	156	g_value_set_string (value, priv->url);
	157	break;
	158
c395c6a5 GB	159	case PROP_REFERER:
	160	g_value_set_string (value, priv->options.referer);
	161	break;
	162
	163	case PROP_FOLLOW_LOCATION:
	164	g_value_set_long (value, priv->options.follow_location);
	165	break;
	166
0f08bd0d GB	167	case PROP_CHECK_FILE_SERVER_TIME:
	168	g_value_set_uint (value, priv->options.check_file_server_time);
	169	break;
	170
4e53f3dc GB	171	default:
	172	/* We don't have any other property... */
	173	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
	174	break;
	175	}
	176	}
	177
e3a90009	178	static void
8eb12ac6	179	vik_slippy_map_source_class_init (VikSlippyMapSourceClass *klass)
e3a90009 GB	180	{
	181	GObjectClass* object_class = G_OBJECT_CLASS (klass);
	182	VikMapSourceClass* parent_class = VIK_MAP_SOURCE_CLASS (klass);
4e53f3dc GB	183	GParamSpec *pspec = NULL;
	184
	185	object_class->set_property = vik_slippy_map_source_set_property;
	186	object_class->get_property = vik_slippy_map_source_get_property;
e3a90009 GB	187
	188	/* Overiding methods */
	189	parent_class->coord_to_mapcoord = _coord_to_mapcoord;
	190	parent_class->mapcoord_to_center_coord = _mapcoord_to_center_coord;
	191	parent_class->download = _download;
0f08bd0d	192	parent_class->supports_if_modified_since = _supports_if_modified_since;
8eb12ac6 GB	193
	194	/* Default implementation of methods */
	195	klass->get_uri = _get_uri;
	196	klass->get_hostname = _get_hostname;
	197	klass->get_download_options = _get_download_options;
4e53f3dc GB	198
	199	pspec = g_param_spec_string ("hostname",
	200	"Hostname",
	201	"The hostname of the map server",
	202	"<no-set>" /* default value */,
	203	G_PARAM_CONSTRUCT_ONLY \| G_PARAM_READWRITE);
	204	g_object_class_install_property (object_class, PROP_HOSTNAME, pspec);
	205
	206	pspec = g_param_spec_string ("url",
	207	"URL",
	208	"The template of the tiles' URL",
	209	"<no-set>" /* default value */,
	210	G_PARAM_CONSTRUCT_ONLY \| G_PARAM_READWRITE);
	211	g_object_class_install_property (object_class, PROP_URL, pspec);
c395c6a5 GB	212
	213	pspec = g_param_spec_string ("referer",
	214	"Referer",
	215	"The REFERER string to use in HTTP request",
	216	NULL /* default value */,
	217	G_PARAM_CONSTRUCT_ONLY \| G_PARAM_READWRITE);
	218	g_object_class_install_property (object_class, PROP_REFERER, pspec);
8eb12ac6	219
c395c6a5 GB	220	pspec = g_param_spec_long ("follow-location",
	221	"Follow location",
	222	"Specifies the number of retries to follow a redirect while downloading a page",
	223	0 /* minimum value */,
	224	G_MAXLONG /* maximum value */,
	225	0 /* default value */,
	226	G_PARAM_CONSTRUCT_ONLY \| G_PARAM_READWRITE);
	227	g_object_class_install_property (object_class, PROP_FOLLOW_LOCATION, pspec);
0f08bd0d GB	228
	229	pspec = g_param_spec_uint ("check-file-server-time",
	230	"Check file server time",
	231	"Age of current cache before redownloading tile",
	232	0 /* minimum value */,
	233	G_MAXUINT16 /* maximum value */,
	234	0 /* default value */,
	235	G_PARAM_CONSTRUCT_ONLY \| G_PARAM_READWRITE);
	236	g_object_class_install_property (object_class, PROP_CHECK_FILE_SERVER_TIME, pspec);
c395c6a5	237
8eb12ac6 GB	238	g_type_class_add_private (klass, sizeof (VikSlippyMapSourcePrivate));
	239
	240	object_class->finalize = vik_slippy_map_source_finalize;
e3a90009 GB	241	}
	242
	243	/* 1 << (x) is like a 2*(x) /
	244	#define GZ(x) ((1<<x))
	245
	246	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),
	247	GZ(10), GZ(11), GZ(12), GZ(13), GZ(14), GZ(15), GZ(16), GZ(17) };
	248
	249	static const gint num_scales = (sizeof(scale_mpps) / sizeof(scale_mpps[0]));
	250
	251	#define ERROR_MARGIN 0.01
	252	static guint8 slippy_zoom ( gdouble mpp ) {
	253	gint i;
	254	for ( i = 0; i < num_scales; i++ ) {
	255	if ( ABS(scale_mpps[i] - mpp) < ERROR_MARGIN )
	256	return i;
	257	}
	258	return 255;
	259	}
	260
	261	gchar *
8eb12ac6	262	vik_slippy_map_source_get_uri( VikSlippyMapSource self, MapCoord src )
e3a90009	263	{
8eb12ac6	264	VikSlippyMapSourceClass *klass;
e3a90009	265	g_return_val_if_fail (self != NULL, 0);
8eb12ac6 GB	266	g_return_val_if_fail (VIK_IS_SLIPPY_MAP_SOURCE (self), 0);
8eb12ac6 GB	267	klass = VIK_SLIPPY_MAP_SOURCE_GET_CLASS(self);
e3a90009 GB	268
	269	g_return_val_if_fail (klass->get_uri != NULL, 0);
	270
	271	return (*klass->get_uri)(self, src);
	272	}
	273
	274	gchar *
8eb12ac6	275	vik_slippy_map_source_get_hostname( VikSlippyMapSource *self )
e3a90009	276	{
8eb12ac6	277	VikSlippyMapSourceClass *klass;
e3a90009	278	g_return_val_if_fail (self != NULL, 0);
8eb12ac6 GB	279	g_return_val_if_fail (VIK_IS_SLIPPY_MAP_SOURCE (self), 0);
8eb12ac6 GB	280	klass = VIK_SLIPPY_MAP_SOURCE_GET_CLASS(self);
e3a90009 GB	281
	282	g_return_val_if_fail (klass->get_hostname != NULL, 0);
	283
	284	return (*klass->get_hostname)(self);
	285	}
	286
	287	DownloadOptions *
8eb12ac6	288	vik_slippy_map_source_get_download_options( VikSlippyMapSource *self )
e3a90009	289	{
8eb12ac6	290	VikSlippyMapSourceClass *klass;
e3a90009	291	g_return_val_if_fail (self != NULL, 0);
8eb12ac6 GB	292	g_return_val_if_fail (VIK_IS_SLIPPY_MAP_SOURCE (self), 0);
8eb12ac6 GB	293	klass = VIK_SLIPPY_MAP_SOURCE_GET_CLASS(self);
e3a90009 GB	294
	295	g_return_val_if_fail (klass->get_download_options != NULL, 0);
	296
	297	return (*klass->get_download_options)(self);
	298	}
	299
0f08bd0d GB	300	gboolean
	301	_supports_if_modified_since (VikMapSource *self)
	302	{
	303	g_return_val_if_fail (VIK_IS_SLIPPY_MAP_SOURCE(self), FALSE);
	304
	305	VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE(self);
	306
	307	g_debug ("%s: priv->options.check_file_server_time = %d", __FUNCTION__, priv->options.check_file_server_time);
	308
	309	return priv->options.check_file_server_time != 0;
	310	}
e3a90009 GB	311	static gboolean
	312	_coord_to_mapcoord ( VikMapSource self, const VikCoord src, gdouble xzoom, gdouble yzoom, MapCoord *dest )
	313	{
	314	g_assert ( src->mode == VIK_COORD_LATLON );
	315
	316	if ( xzoom != yzoom )
	317	return FALSE;
	318
	319	dest->scale = slippy_zoom ( xzoom );
	320	if ( dest->scale == 255 )
	321	return FALSE;
	322
	323	dest->x = (src->east_west + 180) / 360 * GZ(17) / xzoom;
	324	dest->y = (180 - MERCLAT(src->north_south)) / 360 * GZ(17) / xzoom;
	325	dest->z = 0;
	326
	327	return TRUE;
	328	}
	329
	330	static void
	331	_mapcoord_to_center_coord ( VikMapSource self, MapCoord src, VikCoord *dest )
	332	{
	333	gdouble socalled_mpp = GZ(src->scale);
	334	dest->mode = VIK_COORD_LATLON;
	335	dest->east_west = ((src->x+0.5) / GZ(17) * socalled_mpp * 360) - 180;
	336	dest->north_south = DEMERCLAT(180 - ((src->y+0.5) / GZ(17) * socalled_mpp * 360));
	337	}
	338
	339	static int
	340	_download ( VikMapSource self, MapCoord src, const gchar *dest_fn )
	341	{
	342	int res;
8eb12ac6 GB	343	gchar *uri = vik_slippy_map_source_get_uri(VIK_SLIPPY_MAP_SOURCE(self), src);
	344	gchar *host = vik_slippy_map_source_get_hostname(VIK_SLIPPY_MAP_SOURCE(self));
	345	DownloadOptions *options = vik_slippy_map_source_get_download_options(VIK_SLIPPY_MAP_SOURCE(self));
e3a90009 GB	346	res = a_http_download_get_url ( host, uri, dest_fn, options );
	347	g_free ( uri );
	348	g_free ( host );
	349	return res;
	350	}
8eb12ac6 GB	351
	352	static gchar *
	353	_get_uri( VikSlippyMapSource self, MapCoord src )
	354	{
	355	g_return_val_if_fail (VIK_IS_SLIPPY_MAP_SOURCE(self), NULL);
	356
	357	VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE(self);
	358	gchar *uri = g_strdup_printf (priv->url, 17 - src->scale, src->x, src->y);
	359	return uri;
	360	}
	361
	362	static gchar *
	363	_get_hostname( VikSlippyMapSource *self )
	364	{
	365	g_return_val_if_fail (VIK_IS_SLIPPY_MAP_SOURCE(self), NULL);
	366
	367	VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE(self);
	368	return g_strdup( priv->hostname );
	369	}
	370
	371	static DownloadOptions *
	372	_get_download_options( VikSlippyMapSource *self )
	373	{
	374	g_return_val_if_fail (VIK_IS_SLIPPY_MAP_SOURCE(self), NULL);
	375
c395c6a5 GB	376	VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE(self);
c395c6a5 GB	377	return &(priv->options);
8eb12ac6 GB	378	}
	379
	380	VikSlippyMapSource *
db03733a	381	vik_slippy_map_source_new_with_id (guint8 id, const gchar label, const gchar hostname, const gchar *url)
8eb12ac6	382	{
4e53f3dc	383	return g_object_new(VIK_TYPE_SLIPPY_MAP_SOURCE,
db03733a	384	"id", id, "label", label, "hostname", hostname, "url", url, NULL);
c395c6a5	385	}