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 #include <time.h>
  19 #include <glib/gstdio.h>
  20 #include <GL/gl.h>
  21
  22 #include <gis.h>
  23
  24 #include "map.h"
  25
  26 #define MAX_RESOLUTION 500
  27 #define TILE_WIDTH     1024
  28 #define TILE_HEIGHT    512
  29
  30 const guchar colormap[][2][4] = {
  31         {{0x73, 0x91, 0xad}, {0x73, 0x91, 0xad, 0x20}}, // Oceans
  32         {{0xf6, 0xee, 0xee}, {0xf6, 0xee, 0xee, 0x00}}, // Ground
  33         {{0xff, 0xff, 0xff}, {0xff, 0xff, 0xff, 0xff}}, // Borders
  34         {{0x73, 0x93, 0xad}, {0x73, 0x93, 0xad, 0x40}}, // Lakes
  35         {{0xff, 0xe1, 0x80}, {0xff, 0xe1, 0x80, 0x60}}, // Cities
  36 };
  37
  38 struct _LoadTileData {
  39         GisPluginMap *map;
  40         GisTile      *tile;
  41         GdkPixbuf    *pixbuf;
  42 };
  43 #include <stdlib.h>
  44 static gboolean _load_tile_cb(gpointer _data)
  45 {
  46         struct _LoadTileData *data = _data;
  47         GisPluginMap *map    = data->map;
  48         GisTile      *tile   = data->tile;
  49         GdkPixbuf    *pixbuf = data->pixbuf;
  50         g_free(data);
  51
  52         /* Create Texture */
  53         g_debug("GisPluginMap: _load_tile_cb start");
  54         guchar   *pixels = gdk_pixbuf_get_pixels(pixbuf);
  55         gboolean  alpha  = gdk_pixbuf_get_has_alpha(pixbuf);
  56         gint      width  = gdk_pixbuf_get_width(pixbuf);
  57         gint      height = gdk_pixbuf_get_height(pixbuf);
  58
  59         for (int i = 0; i < width*height; i++) {
  60                 for (int j = 0; j < G_N_ELEMENTS(colormap); j++) {
  61                         if (pixels[i*4+0] == colormap[j][0][0] &&
  62                             pixels[i*4+1] == colormap[j][0][1] &&
  63                             pixels[i*4+2] == colormap[j][0][2]) {
  64                                 pixels[i*4+0] = colormap[j][1][0];
  65                                 pixels[i*4+1] = colormap[j][1][1];
  66                                 pixels[i*4+2] = colormap[j][1][2];
  67                                 pixels[i*4+3] = colormap[j][1][3];
  68                                 break;
  69                         }
  70                 }
  71         }
  72
  73         guint *tex = g_new0(guint, 1);
  74         glGenTextures(1, tex);
  75         glBindTexture(GL_TEXTURE_2D, *tex);
  76
  77         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  78         glPixelStorei(GL_PACK_ALIGNMENT, 1);
  79         glTexImage2D(GL_TEXTURE_2D, 0, 4, width, height, 0,
  80                         (alpha ? GL_RGBA : GL_RGB), GL_UNSIGNED_BYTE, pixels);
  81         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  82         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  83         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
  84         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
  85         glFlush();
  86
  87         tile->data = tex;
  88         gtk_widget_queue_draw(GTK_WIDGET(map->viewer));
  89         g_object_unref(pixbuf);
  90         return FALSE;
  91 }
  92
  93 static void _load_tile(GisTile *tile, gpointer _map)
  94 {
  95         GisPluginMap *map = _map;
  96         g_debug("GisPluginMap: _load_tile start %p", g_thread_self());
  97         char *path = gis_wms_fetch(map->wms, tile, GIS_ONCE, NULL, NULL);
  98         struct _LoadTileData *data = g_new0(struct _LoadTileData, 1);
  99         data->map    = map;
 100         data->tile   = tile;
 101         data->pixbuf = gdk_pixbuf_new_from_file(path, NULL);
 102         if (data->pixbuf) {
 103                 g_idle_add_full(G_PRIORITY_LOW, _load_tile_cb, data, NULL);
 104         } else {
 105                 g_warning("GisPluginMap: _load_tile - Error loading pixbuf %s", path);
 106                 g_remove(path);
 107         }
 108         g_free(path);
 109         g_debug("GisPluginMap: _load_tile end %p", g_thread_self());
 110 }
 111
 112 static gboolean _free_tile_cb(gpointer data)
 113 {
 114         glDeleteTextures(1, data);
 115         g_free(data);
 116         return FALSE;
 117 }
 118 static void _free_tile(GisTile *tile, gpointer _map)
 119 {
 120         GisPluginMap *map = _map;
 121         g_debug("GisPluginMap: _free_tile: %p", tile->data);
 122         g_idle_add_full(G_PRIORITY_LOW, _free_tile_cb, tile->data, NULL);
 123 }
 124
 125 static gpointer _update_tiles(gpointer _map)
 126 {
 127         g_debug("GisPluginMap: _update_tiles");
 128         GisPluginMap *map = _map;
 129         g_mutex_lock(map->mutex);
 130         gdouble lat, lon, elev;
 131         gis_viewer_get_location(map->viewer, &lat, &lon, &elev);
 132         gis_tile_update(map->tiles,
 133                         MAX_RESOLUTION, TILE_WIDTH, TILE_WIDTH,
 134                         lat, lon, elev,
 135                         _load_tile, map);
 136         gis_tile_gc(map->tiles, time(NULL)-10,
 137                         _free_tile, map);
 138         g_mutex_unlock(map->mutex);
 139         return NULL;
 140 }
 141
 142 /*************
 143  * Callbacks *
 144  *************/
 145 static void _on_location_changed(GisViewer *viewer,
 146                 gdouble lat, gdouble lon, gdouble elev, GisPluginMap *map)
 147 {
 148         g_thread_create(_update_tiles, map, FALSE, NULL);
 149 }
 150
 151 /***********
 152  * Methods *
 153  ***********/
 154 GisPluginMap *gis_plugin_map_new(GisViewer *viewer)
 155 {
 156         g_debug("GisPluginMap: new");
 157         GisPluginMap *map = g_object_new(GIS_TYPE_PLUGIN_MAP, NULL);
 158         map->viewer = g_object_ref(viewer);
 159
 160         /* Load initial tiles */
 161         _load_tile(map->tiles, map);
 162         g_thread_create(_update_tiles, map, FALSE, NULL);
 163
 164         /* Connect signals */
 165         map->sigid = g_signal_connect(map->viewer, "location-changed",
 166                         G_CALLBACK(_on_location_changed), map);
 167
 168         /* Add renderers */
 169         gis_viewer_add(viewer, GIS_OBJECT(map->tiles), GIS_LEVEL_OVERLAY, 0);
 170
 171         return map;
 172 }
 173
 174
 175 /****************
 176  * GObject code *
 177  ****************/
 178 /* Plugin init */
 179 static void gis_plugin_map_plugin_init(GisPluginInterface *iface);
 180 G_DEFINE_TYPE_WITH_CODE(GisPluginMap, gis_plugin_map, G_TYPE_OBJECT,
 181                 G_IMPLEMENT_INTERFACE(GIS_TYPE_PLUGIN,
 182                         gis_plugin_map_plugin_init));
 183 static void gis_plugin_map_plugin_init(GisPluginInterface *iface)
 184 {
 185         g_debug("GisPluginMap: plugin_init");
 186         /* Add methods to the interface */
 187 }
 188 /* Class/Object init */
 189 static void gis_plugin_map_init(GisPluginMap *map)
 190 {
 191         g_debug("GisPluginMap: init");
 192         /* Set defaults */
 193         map->mutex  = g_mutex_new();
 194         map->tiles  = gis_tile_new(NULL, NORTH, SOUTH, EAST, WEST);
 195         map->wms    = gis_wms_new(
 196                 "http://labs.metacarta.com/wms/vmap0", "basic", "image/png",
 197                 "osm/", "png", TILE_WIDTH, TILE_HEIGHT);
 198 }
 199 static void gis_plugin_map_dispose(GObject *gobject)
 200 {
 201         g_debug("GisPluginMap: dispose");
 202         GisPluginMap *map = GIS_PLUGIN_MAP(gobject);
 203         /* Drop references */
 204         if (map->viewer) {
 205                 g_signal_handler_disconnect(map->viewer, map->sigid);
 206                 g_object_unref(map->viewer);
 207                 map->viewer = NULL;
 208         }
 209         G_OBJECT_CLASS(gis_plugin_map_parent_class)->dispose(gobject);
 210 }
 211 static void gis_plugin_map_finalize(GObject *gobject)
 212 {
 213         g_debug("GisPluginMap: finalize");
 214         GisPluginMap *map = GIS_PLUGIN_MAP(gobject);
 215         /* Free data */
 216         gis_tile_free(map->tiles, _free_tile, map);
 217         gis_wms_free(map->wms);
 218         g_mutex_free(map->mutex);
 219         G_OBJECT_CLASS(gis_plugin_map_parent_class)->finalize(gobject);
 220
 221 }
 222 static void gis_plugin_map_class_init(GisPluginMapClass *klass)
 223 {
 224         g_debug("GisPluginMap: class_init");
 225         GObjectClass *gobject_class = (GObjectClass*)klass;
 226         gobject_class->dispose  = gis_plugin_map_dispose;
 227         gobject_class->finalize = gis_plugin_map_finalize;
 228 }