Pileus Git - grits/blob - src/plugins/map.c

   1 /*
   2  * Copyright (C) 2009-2010 Andy Spencer <andy753421@gmail.com>
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 /**
  19  * SECTION:map
  20  * @short_description: Map plugin
  21  *
  22  * #GisPluginMap provides map overlays. Much of this data is obtained from the
  23  * OpenStreetMap project.
  24  */
  25
  26 #include <time.h>
  27 #include <stdlib.h>
  28 #include <glib/gstdio.h>
  29 #include <GL/gl.h>
  30
  31 #include <gis.h>
  32
  33 #include "map.h"
  34
  35 #define MAX_RESOLUTION 500
  36 #define TILE_WIDTH     1024
  37 #define TILE_HEIGHT    512
  38
  39 static const guchar colormap[][2][4] = {
  40         {{0x73, 0x91, 0xad}, {0x73, 0x91, 0xad, 0x20}}, // Oceans
  41         {{0xf6, 0xee, 0xee}, {0xf6, 0xee, 0xee, 0x00}}, // Ground
  42         {{0xff, 0xff, 0xff}, {0xff, 0xff, 0xff, 0xff}}, // Borders
  43         {{0x73, 0x93, 0xad}, {0x73, 0x93, 0xad, 0x40}}, // Lakes
  44         {{0xff, 0xe1, 0x80}, {0xff, 0xe1, 0x80, 0x60}}, // Cities
  45 };
  46
  47 struct _LoadTileData {
  48         GisPluginMap *map;
  49         GisTile      *tile;
  50         gchar        *path;
  51 };
  52 static gboolean _load_tile_cb(gpointer _data)
  53 {
  54         struct _LoadTileData *data = _data;
  55         GisPluginMap *map  = data->map;
  56         GisTile      *tile = data->tile;
  57         gchar        *path = data->path;
  58         g_free(data);
  59
  60         /* Load pixbuf */
  61         g_debug("GisPluginMap: _load_tile_cb start");
  62         GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file(path, NULL);
  63         if (!pixbuf) {
  64                 g_warning("GisPluginMap: _load_tile - Error loading pixbuf %s", path);
  65                 g_remove(path);
  66                 g_free(path);
  67                 return FALSE;
  68         }
  69         g_free(path);
  70
  71         /* Create Texture */
  72         guchar   *pixels = gdk_pixbuf_get_pixels(pixbuf);
  73         gboolean  alpha  = gdk_pixbuf_get_has_alpha(pixbuf);
  74         gint      width  = gdk_pixbuf_get_width(pixbuf);
  75         gint      height = gdk_pixbuf_get_height(pixbuf);
  76
  77         for (int i = 0; i < width*height; i++) {
  78                 for (int j = 0; j < G_N_ELEMENTS(colormap); j++) {
  79                         if (pixels[i*4+0] == colormap[j][0][0] &&
  80                             pixels[i*4+1] == colormap[j][0][1] &&
  81                             pixels[i*4+2] == colormap[j][0][2]) {
  82                                 pixels[i*4+0] = colormap[j][1][0];
  83                                 pixels[i*4+1] = colormap[j][1][1];
  84                                 pixels[i*4+2] = colormap[j][1][2];
  85                                 pixels[i*4+3] = colormap[j][1][3];
  86                                 break;
  87                         }
  88                 }
  89         }
  90
  91         guint *tex = g_new0(guint, 1);
  92         glGenTextures(1, tex);
  93         glBindTexture(GL_TEXTURE_2D, *tex);
  94
  95         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  96         glPixelStorei(GL_PACK_ALIGNMENT, 1);
  97         glTexImage2D(GL_TEXTURE_2D, 0, 4, width, height, 0,
  98                         (alpha ? GL_RGBA : GL_RGB), GL_UNSIGNED_BYTE, pixels);
  99         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 100         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 101         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
 102         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
 103         glFlush();
 104
 105         tile->data = tex;
 106         gtk_widget_queue_draw(GTK_WIDGET(map->viewer));
 107         g_object_unref(pixbuf);
 108         return FALSE;
 109 }
 110
 111 static void _load_tile(GisTile *tile, gpointer _map)
 112 {
 113         GisPluginMap *map = _map;
 114         g_debug("GisPluginMap: _load_tile start %p", g_thread_self());
 115         struct _LoadTileData *data = g_new0(struct _LoadTileData, 1);
 116         data->map  = map;
 117         data->tile = tile;
 118         data->path = gis_wms_fetch(map->wms, tile, GIS_ONCE, NULL, NULL);
 119         g_idle_add_full(G_PRIORITY_LOW, _load_tile_cb, data, NULL);
 120         g_debug("GisPluginMap: _load_tile end %p", g_thread_self());
 121 }
 122
 123 static gboolean _free_tile_cb(gpointer data)
 124 {
 125         glDeleteTextures(1, data);
 126         g_free(data);
 127         return FALSE;
 128 }
 129 static void _free_tile(GisTile *tile, gpointer _map)
 130 {
 131         g_debug("GisPluginMap: _free_tile: %p", tile->data);
 132         if (tile->data)
 133                 g_idle_add_full(G_PRIORITY_LOW, _free_tile_cb, tile->data, NULL);
 134 }
 135
 136 static gpointer _update_tiles(gpointer _map)
 137 {
 138         g_debug("GisPluginMap: _update_tiles");
 139         GisPluginMap *map = _map;
 140         if (!g_mutex_trylock(map->mutex))
 141                 return NULL;
 142         GisPoint eye;
 143         gis_viewer_get_location(map->viewer, &eye.lat, &eye.lon, &eye.elev);
 144         gis_tile_update(map->tiles, &eye,
 145                         MAX_RESOLUTION, TILE_WIDTH, TILE_WIDTH,
 146                         _load_tile, map);
 147         gis_tile_gc(map->tiles, time(NULL)-10,
 148                         _free_tile, map);
 149         g_mutex_unlock(map->mutex);
 150         return NULL;
 151 }
 152
 153 /*************
 154  * Callbacks *
 155  *************/
 156 static void _on_location_changed(GisViewer *viewer,
 157                 gdouble lat, gdouble lon, gdouble elev, GisPluginMap *map)
 158 {
 159         g_thread_create(_update_tiles, map, FALSE, NULL);
 160 }
 161
 162 static gpointer _threaded_init(GisPluginMap *map)
 163 {
 164         _load_tile(map->tiles, map);
 165         _update_tiles(map);
 166         return NULL;
 167 }
 168
 169 /***********
 170  * Methods *
 171  ***********/
 172 /**
 173  * gis_plugin_map_new:
 174  * @viewer: the #GisViewer to use for drawing
 175  *
 176  * Create a new instance of the map plugin.
 177  *
 178  * Returns: the new #GisPluginMap
 179  */
 180 GisPluginMap *gis_plugin_map_new(GisViewer *viewer)
 181 {
 182         g_debug("GisPluginMap: new");
 183         GisPluginMap *map = g_object_new(GIS_TYPE_PLUGIN_MAP, NULL);
 184         map->viewer = g_object_ref(viewer);
 185
 186         /* Load initial tiles */
 187         g_thread_create((GThreadFunc)_threaded_init, map, FALSE, NULL);
 188
 189         /* Connect signals */
 190         map->sigid = g_signal_connect(map->viewer, "location-changed",
 191                         G_CALLBACK(_on_location_changed), map);
 192
 193         /* Add renderers */
 194         gis_viewer_add(viewer, GIS_OBJECT(map->tiles), GIS_LEVEL_OVERLAY-1, 0);
 195
 196         return map;
 197 }
 198
 199
 200 /****************
 201  * GObject code *
 202  ****************/
 203 /* Plugin init */
 204 static void gis_plugin_map_plugin_init(GisPluginInterface *iface);
 205 G_DEFINE_TYPE_WITH_CODE(GisPluginMap, gis_plugin_map, G_TYPE_OBJECT,
 206                 G_IMPLEMENT_INTERFACE(GIS_TYPE_PLUGIN,
 207                         gis_plugin_map_plugin_init));
 208 static void gis_plugin_map_plugin_init(GisPluginInterface *iface)
 209 {
 210         g_debug("GisPluginMap: plugin_init");
 211         /* Add methods to the interface */
 212 }
 213 /* Class/Object init */
 214 static void gis_plugin_map_init(GisPluginMap *map)
 215 {
 216         g_debug("GisPluginMap: init");
 217         /* Set defaults */
 218         map->mutex  = g_mutex_new();
 219         map->tiles  = gis_tile_new(NULL, NORTH, SOUTH, EAST, WEST);
 220         map->wms    = gis_wms_new(
 221                 "http://labs.metacarta.com/wms/vmap0", "basic", "image/png",
 222                 "osm/", "png", TILE_WIDTH, TILE_HEIGHT);
 223 }
 224 static void gis_plugin_map_dispose(GObject *gobject)
 225 {
 226         g_debug("GisPluginMap: dispose");
 227         GisPluginMap *map = GIS_PLUGIN_MAP(gobject);
 228         /* Drop references */
 229         if (map->viewer) {
 230                 g_signal_handler_disconnect(map->viewer, map->sigid);
 231                 g_object_unref(map->viewer);
 232                 map->viewer = NULL;
 233         }
 234         G_OBJECT_CLASS(gis_plugin_map_parent_class)->dispose(gobject);
 235 }
 236 static void gis_plugin_map_finalize(GObject *gobject)
 237 {
 238         g_debug("GisPluginMap: finalize");
 239         GisPluginMap *map = GIS_PLUGIN_MAP(gobject);
 240         /* Free data */
 241         gis_tile_free(map->tiles, _free_tile, map);
 242         gis_wms_free(map->wms);
 243         g_mutex_free(map->mutex);
 244         G_OBJECT_CLASS(gis_plugin_map_parent_class)->finalize(gobject);
 245
 246 }
 247 static void gis_plugin_map_class_init(GisPluginMapClass *klass)
 248 {
 249         g_debug("GisPluginMap: class_init");
 250         GObjectClass *gobject_class = (GObjectClass*)klass;
 251         gobject_class->dispose  = gis_plugin_map_dispose;
 252         gobject_class->finalize = gis_plugin_map_finalize;
 253 }