// Process a layer and add labels.
simplet_status_t
simplet_layer_process(simplet_layer_t *layer, simplet_map_t *map, simplet_lithograph_t *litho, cairo_t *ctx){
simplet_listiter_t *iter; OGRDataSourceH source;
if(!(source = OGROpenShared(layer->source, 0, NULL)))
return set_error(layer, SIMPLET_OGR_ERR, "error opening layer source");
// Retain the datasource because we want to cache open connections to a
// data source like postgres.
if(OGR_DS_GetRefCount(source) == 1) OGR_DS_Reference(source);
if(!(iter = simplet_get_list_iter(layer->filters))){
OGRReleaseDataSource(source);
return set_error(layer, SIMPLET_OOM, "out of memory getting list iterator");
}
// Loop through the layer's filters and process them.
simplet_filter_t *filter;
simplet_status_t status = SIMPLET_OK;
while((filter = simplet_list_next(iter))) {
status = simplet_filter_process(filter, map, source, litho, ctx);
if(status != SIMPLET_OK){
simplet_list_iter_free(iter);
OGRReleaseDataSource(source);
return status;
}
simplet_lithograph_apply(litho, filter->styles);
}
OGRReleaseDataSource(source);
return SIMPLET_OK;
}
// The atexit handler used to close all connections to open data stores
static void
cleanup(){
for(int i = 0; i < OGRGetOpenDSCount(); i++)
while(OGRGetOpenDS(i) && OGR_DS_GetRefCount(OGRGetOpenDS(i)))
OGRReleaseDataSource(OGRGetOpenDS(i));
assert(!OGRGetOpenDSCount());
OGRCleanupAll();
}
