Function msOGRLayerGetAutoStyle

mapogr.cpp:3542–3619

* msOGRLayerGetAutoStyle() * * Fills a classObj with style info from the specified shape. * For optimal results, this should be called immediately after * GetNextShape() or GetShape() so that the shape doesn't have to be read * twice. * * The returned classObj is a ref. to a static structure valid only until * the next call and that shouldn't be freed by the caller. *

 * the next call and that shouldn't be freed by the caller.
 **********************************************************************/
static int msOGRLayerGetAutoStyle(mapObj *map, layerObj *layer, classObj *c,
                                  shapeObj* shape)
{
#ifdef USE_OGR
  msOGRFileInfo *psInfo =(msOGRFileInfo*)layer->layerinfo;

  if (psInfo == NULL || psInfo->hLayer == NULL)
  {
    msSetError(MS_MISCERR, "Assertion failed: OGR layer not opened!!!", 
               "msOGRLayerGetAutoStyle()");
    return(MS_FAILURE);
  }

  if( layer->tileindex != NULL )
  {
      if( (psInfo->poCurTile == NULL || shape->tileindex != psInfo->poCurTile->nTileId)
          && msOGRFileReadTile( layer, psInfo ) != MS_SUCCESS )
          return MS_FAILURE;
      
      psInfo = psInfo->poCurTile;
  }

/* ------------------------------------------------------------------
 * Read shape or reuse ref. to last shape read.
 * ------------------------------------------------------------------ */
  ACQUIRE_OGR_LOCK;
  if (psInfo->hLastFeature == NULL || 
      psInfo->last_record_index_read != shape->resultindex)
  {
      RELEASE_OGR_LOCK;
      msSetError(MS_MISCERR, 
                 "Assertion failed: AutoStyle not requested on loaded shape.",
                 "msOGRLayerGetAutoStyle()");
      return(MS_FAILURE);
  }

/* ------------------------------------------------------------------
 * Reset style info in the class to defaults
 * the only members we don't touch are name, expression, and join/query stuff
 * ------------------------------------------------------------------ */
  resetClassStyle(c);
  if (msMaybeAllocateClassStyle(c, 0)) {
      RELEASE_OGR_LOCK;
      return(MS_FAILURE);
  }

  // __TODO__ label cache incompatible with styleitem feature.
  layer->labelcache = MS_OFF;

  int nRetVal = MS_SUCCESS;
  if (psInfo->hLastFeature)
  {
#if GDAL_VERSION_NUM >= 1500 /* Use OGR Style C API */
      OGRStyleMgrH hStyleMgr = OGR_SM_Create(NULL);
      OGR_SM_InitFromFeature(hStyleMgr, psInfo->hLastFeature);
      nRetVal = msOGRUpdateStyle(hStyleMgr, map, layer, c);
      OGR_SM_Destroy(hStyleMgr);
#else /* OGRStyle C++ */