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         GdkPixbuf    *pixbuf;
  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         GdkPixbuf    *pixbuf = data->pixbuf;
  58         g_free(data);
  59
  60         /* Create Texture */
  61         g_debug("GisPluginMap: _load_tile_cb start");
  62         guchar   *pixels = gdk_pixbuf_get_pixels(pixbuf);
  63         gboolean  alpha  = gdk_pixbuf_get_has_alpha(pixbuf);
  64         gint      width  = gdk_pixbuf_get_width(pixbuf);
  65         gint      height = gdk_pixbuf_get_height(pixbuf);
  66
  67         for (int i = 0; i < width*height; i++) {
  68                 for (int j = 0; j < G_N_ELEMENTS(colormap); j++) {
  69                         if (pixels[i*4+0] == colormap[j][0][0] &&
  70                             pixels[i*4+1] == colormap[j][0][1] &&
  71                             pixels[i*4+2] == colormap[j][0][2]) {
  72                                 pixels[i*4+0] = colormap[j][1][0];
  73                                 pixels[i*4+1] = colormap[j][1][1];
  74                                 pixels[i*4+2] = colormap[j][1][2];
  75                                 pixels[i*4+3] = colormap[j][1][3];
  76                                 break;
  77                         }
  78                 }
  79         }
  80
  81         guint *tex = g_new0(guint, 1);
  82         glGenTextures(1, tex);
  83         glBindTexture(GL_TEXTURE_2D, *tex);
  84
  85         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  86         glPixelStorei(GL_PACK_ALIGNMENT, 1);
  87         glTexImage2D(GL_TEXTURE_2D, 0, 4, width, height, 0,
  88                         (alpha ? GL_RGBA : GL_RGB), GL_UNSIGNED_BYTE, pixels);
  89         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  90         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  91         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
  92         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
  93         glFlush();
  94
  95         tile->data = tex;
  96         gtk_widget_queue_draw(GTK_WIDGET(map->viewer));
  97         g_object_unref(pixbuf);
  98         return FALSE;
  99 }
 100
 101 static void _load_tile(GisTile *tile, gpointer _map)
 102 {
 103         GisPluginMap *map = _map;
 104         g_debug("GisPluginMap: _load_tile start %p", g_thread_self());
 105         char *path = gis_wms_fetch(map->wms, tile, GIS_ONCE, NULL, NULL);
 106         struct _LoadTileData *data = g_new0(struct _LoadTileData, 1);
 107         data->map    = map;
 108         data->tile   = tile;
 109         data->pixbuf = gdk_pixbuf_new_from_file(path, NULL);
 110         if (data->pixbuf) {
 111                 g_idle_add_full(G_PRIORITY_LOW, _load_tile_cb, data, NULL);
 112         } else {
 113                 g_warning("GisPluginMap: _load_tile - Error loading pixbuf %s", path);
 114                 g_remove(path);
 115         }
 116         g_free(path);
 117         g_debug("GisPluginMap: _load_tile end %p", g_thread_self());
 118 }
 119
 120 static gboolean _free_tile_cb(gpointer data)
 121 {
 122         glDeleteTextures(1, data);
 123         g_free(data);
 124         return FALSE;
 125 }
 126 static void _free_tile(GisTile *tile, gpointer _map)
 127 {
 128         GisPluginMap *map = _map;
 129         g_debug("GisPluginMap: _free_tile: %p", tile->data);
 130         g_idle_add_full(G_PRIORITY_LOW, _free_tile_cb, tile->data, NULL);
 131 }
 132
 133 static gpointer _update_tiles(gpointer _map)
 134 {
 135         g_debug("GisPluginMap: _update_tiles");
 136         GisPluginMap *map = _map;
 137         if (!g_mutex_trylock(map->mutex))
 138                 return NULL;
 139         gdouble lat, lon, elev;
 140         gis_viewer_get_location(map->viewer, &lat, &lon, &elev);
 141         gis_tile_update(map->tiles,
 142                         MAX_RESOLUTION, TILE_WIDTH, TILE_WIDTH,
 143                         lat, lon, elev,
 144                         _load_tile, map);
 145         gis_tile_gc(map->tiles, time(NULL)-10,
 146                         _free_tile, map);
 147         g_mutex_unlock(map->mutex);
 148         return NULL;
 149 }
 150
 151 /*************
 152  * Callbacks *
 153  *************/
 154 static void _on_location_changed(GisViewer *viewer,
 155                 gdouble lat, gdouble lon, gdouble elev, GisPluginMap *map)
 156 {
 157         g_thread_create(_update_tiles, map, FALSE, NULL);
 158 }
 159
 160 static gpointer _threaded_init(GisPluginMap *map)
 161 {
 162         _load_tile(map->tiles, map);
 163         _update_tiles(map);
 164         return NULL;
 165 }
 166
 167 /***********
 168  * Methods *
 169  ***********/
 170 /**
 171  * gis_plugin_map_new:
 172  * @viewer: the #GisViewer to use for drawing
 173  *
 174  * Create a new instance of the map plugin.
 175  *
 176  * Returns: the new #GisPluginMap
 177  */
 178 GisPluginMap *gis_plugin_map_new(GisViewer *viewer)
 179 {
 180         g_debug("GisPluginMap: new");
 181         GisPluginMap *map = g_object_new(GIS_TYPE_PLUGIN_MAP, NULL);
 182         map->viewer = g_object_ref(viewer);
 183
 184         /* Load initial tiles */
 185         g_thread_create((GThreadFunc)_threaded_init, map, FALSE, NULL);
 186
 187         /* Connect signals */
 188         map->sigid = g_signal_connect(map->viewer, "location-changed",
 189                         G_CALLBACK(_on_location_changed), map);
 190
 191         /* Add renderers */
 192         gis_viewer_add(viewer, GIS_OBJECT(map->tiles), GIS_LEVEL_OVERLAY, 0);
 193
 194         return map;
 195 }
 196
 197
 198 /****************
 199  * GObject code *
 200  ****************/
 201 /* Plugin init */
 202 static void gis_plugin_map_plugin_init(GisPluginInterface *iface);
 203 G_DEFINE_TYPE_WITH_CODE(GisPluginMap, gis_plugin_map, G_TYPE_OBJECT,
 204                 G_IMPLEMENT_INTERFACE(GIS_TYPE_PLUGIN,
 205                         gis_plugin_map_plugin_init));
 206 static void gis_plugin_map_plugin_init(GisPluginInterface *iface)
 207 {
 208         g_debug("GisPluginMap: plugin_init");
 209         /* Add methods to the interface */
 210 }
 211 /* Class/Object init */
 212 static void gis_plugin_map_init(GisPluginMap *map)
 213 {
 214         g_debug("GisPluginMap: init");
 215         /* Set defaults */
 216         map->mutex  = g_mutex_new();
 217         map->tiles  = gis_tile_new(NULL, NORTH, SOUTH, EAST, WEST);
 218         map->wms    = gis_wms_new(
 219                 "http://labs.metacarta.com/wms/vmap0", "basic", "image/png",
 220                 "osm/", "png", TILE_WIDTH, TILE_HEIGHT);
 221 }
 222 static void gis_plugin_map_dispose(GObject *gobject)
 223 {
 224         g_debug("GisPluginMap: dispose");
 225         GisPluginMap *map = GIS_PLUGIN_MAP(gobject);
 226         /* Drop references */
 227         if (map->viewer) {
 228                 g_signal_handler_disconnect(map->viewer, map->sigid);
 229                 g_object_unref(map->viewer);
 230                 map->viewer = NULL;
 231         }
 232         G_OBJECT_CLASS(gis_plugin_map_parent_class)->dispose(gobject);
 233 }
 234 static void gis_plugin_map_finalize(GObject *gobject)
 235 {
 236         g_debug("GisPluginMap: finalize");
 237         GisPluginMap *map = GIS_PLUGIN_MAP(gobject);
 238         /* Free data */
 239         gis_tile_free(map->tiles, _free_tile, map);
 240         gis_wms_free(map->wms);
 241         g_mutex_free(map->mutex);
 242         G_OBJECT_CLASS(gis_plugin_map_parent_class)->finalize(gobject);
 243
 244 }
 245 static void gis_plugin_map_class_init(GisPluginMapClass *klass)
 246 {
 247         g_debug("GisPluginMap: class_init");
 248         GObjectClass *gobject_class = (GObjectClass*)klass;
 249         gobject_class->dispose  = gis_plugin_map_dispose;
 250         gobject_class->finalize = gis_plugin_map_finalize;
 251 }