Function msDrawMap

mapdraw.c:259–580

* Generic function to render the map file. * The type of the image created is based on the imagetype parameter in the map file. * * mapObj *map - map object loaded in MapScript or via a mapfile to use * int querymap - is this map the result of a query operation, MS_TRUE|MS_FALSE */

 * int querymap - is this map the result of a query operation, MS_TRUE|MS_FALSE 
*/
imageObj *msDrawMap(mapObj *map, int querymap)
{
  int i;
  layerObj *lp=NULL;
  int status = MS_FAILURE;
  imageObj *image = NULL;
  struct mstimeval mapstarttime, mapendtime;
  struct mstimeval starttime, endtime;

#if defined(USE_WMS_LYR) || defined(USE_WFS_LYR)
  enum MS_CONNECTION_TYPE lastconnectiontype;
  httpRequestObj *pasOWSReqInfo=NULL;
  int numOWSLayers=0, numOWSRequests=0;
  wmsParamsObj sLastWMSParams;
#endif

  if(map->debug >= MS_DEBUGLEVEL_TUNING) msGettimeofday(&mapstarttime, NULL);

  if(querymap) { /* use queryMapObj image dimensions */
    if(map->querymap.width != -1) map->width = map->querymap.width;
    if(map->querymap.height != -1) map->height = map->querymap.height;
  }

  msApplyMapConfigOptions(map);
  image = msPrepareImage(map, MS_TRUE);

  if(!image) {
    msSetError(MS_IMGERR, "Unable to initialize image.", "msDrawMap()");
    return(NULL);
  }

  if( map->debug >= MS_DEBUGLEVEL_DEBUG )
      msDebug( "msDrawMap(): rendering using outputformat named %s (%s).\n",
               map->outputformat->name, 
               map->outputformat->driver );

#if defined(USE_WMS_LYR) || defined(USE_WFS_LYR)

  /* Time the OWS query phase */
  if(map->debug >= MS_DEBUGLEVEL_TUNING ) msGettimeofday(&starttime, NULL);

  /* How many OWS (WMS/WFS) layers do we have to draw?
   * Note: numOWSLayers is the number of actual layers and numOWSRequests is
   * the number of HTTP requests which could be lower if multiple layers 
   * are merged into the same request.
   */
  numOWSLayers=0;
  for(i=0; i<map->numlayers; i++) {
    if(map->layerorder[i] != -1 && 
       msLayerIsVisible(map, GET_LAYER(map,map->layerorder[i])))
        numOWSLayers++;
  }


  if (numOWSLayers > 0) {
    /* Alloc and init pasOWSReqInfo...
     */
    pasOWSReqInfo = (httpRequestObj *)malloc((numOWSLayers+1)*sizeof(httpRequestObj));