Function msLayerGetExtent

maplayer.c:281–312

** Returns extent of spatial coverage for a layer. ** ** If layer->extent is set then this value is used, otherwise the ** driver-specific implementation is called (this can be expensive). ** ** If layer is not already opened then it is opened and closed (so this ** function can be called on both opened or closed layers). ** ** Returns MS_SUCCESS/MS_FAILURE. */

** Returns MS_SUCCESS/MS_FAILURE.
*/
int msLayerGetExtent(layerObj *layer, rectObj *extent) 
{
  int need_to_close = MS_FALSE, status = MS_SUCCESS;

  if (MS_VALID_EXTENT(layer->extent))
  {
      *extent = layer->extent;
      return MS_SUCCESS;
  }

  if (!msLayerIsOpen(layer))
  {
      if (msLayerOpen(layer) != MS_SUCCESS)
          return MS_FAILURE;
      need_to_close = MS_TRUE;
  }

  if ( ! layer->vtable) {
      int rv =  msInitializeVirtualTable(layer);
      if (rv != MS_SUCCESS) {
        if (need_to_close)
            msLayerClose(layer);
            return rv;
      }
  }
  status = layer->vtable->LayerGetExtent(layer, extent);

  if (need_to_close)
      msLayerClose(layer);

  return(status);
}

int msLayerGetItemIndex(layerObj *layer, char *item)
{