Function msWMSGetMap

mapwms.c:2815–2922

** msWMSGetMap() */

** msWMSGetMap()
*/
int msWMSGetMap(mapObj *map, int nVersion, char **names, char **values, int numentries,
                char *wms_exception_format, owsRequestObj *ows_request)
{
  imageObj *img;
  int i = 0;
  int sldrequested = MS_FALSE,  sldspatialfilter = MS_FALSE;
  const char *http_max_age;

  /* __TODO__ msDrawMap() will try to adjust the extent of the map */
  /* to match the width/height image ratio. */
  /* The spec states that this should not happen so that we can deliver */
  /* maps to devices with non-square pixels. */


/* If there was an SLD in the request, we need to treat it */
/* diffrently : some SLD may contain spatial filters requiring */
/* to do a query. While parsing the SLD and applying it to the */
/* layer, we added a temporary metadata on the layer */
/* (tmp_wms_sld_query) for layers with a spatial filter. */

  for (i=0; i<numentries; i++)
  {
    if ((strcasecmp(names[i], "SLD") == 0 && values[i] && strlen(values[i]) > 0) ||
        (strcasecmp(names[i], "SLD_BODY") == 0 && values[i] && strlen(values[i]) > 0))
    {
        sldrequested = MS_TRUE;
        break;
    }
  }
  if (sldrequested)
  {
      for (i=0; i<map->numlayers; i++)
      {
          if (msLookupHashTable(&(GET_LAYER(map, i)->metadata), "tmp_wms_sld_query"))
          {
              sldspatialfilter = MS_TRUE;
              break;
          }
      }
  }

  /* turn off layer if WMS GetMap is not enabled */
  for (i=0; i<map->numlayers; i++)
      if (!msIntegerInArray(GET_LAYER(map, i)->index, ows_request->enabled_layers, ows_request->numlayers))
          GET_LAYER(map, i)->status = MS_OFF;

  if (sldrequested && sldspatialfilter)
  {
      /* set the quermap style so that only selected features will be retruned */
      map->querymap.status = MS_ON;
      map->querymap.style = MS_SELECTED;

      img = msPrepareImage(map, MS_TRUE);
      
      /* compute layer scale factors now */
      for(i=0;i<map->numlayers; i++) {
          if(GET_LAYER(map, i)->sizeunits != MS_PIXELS)
            GET_LAYER(map, i)->scalefactor = (msInchesPerUnit(GET_LAYER(map, i)->sizeunits,0)/msInchesPerUnit(map->units,0)) / map->cellsize;