From 04434e7ef936a28e6d87bc6c0bb69c95db28c0a4 Mon Sep 17 00:00:00 2001
From: Bborie Park <bkpark at ucdavis.edu>
Date: Wed, 24 Oct 2012 22:21:56 +0000
Subject: [PATCH] Added checks to rt_raster_gdal_rasterize() and
 RASTER_asRaster() where if input geometry is empty, return empty raster.

git-svn-id: http://svn.osgeo.org/postgis/trunk@10550 b70326c6-7e19-0410-871a-916f4a2858ee
---
 raster/rt_core/rt_api.c | 18 ++++++++++++++++++
 raster/rt_pg/rt_pg.c    | 20 ++++++++++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/raster/rt_core/rt_api.c b/raster/rt_core/rt_api.c
index e4b02b9e0..11761a047 100644
--- a/raster/rt_core/rt_api.c
+++ b/raster/rt_core/rt_api.c
@@ -10272,6 +10272,24 @@ rt_raster_gdal_rasterize(const unsigned char *wkb,
 		return NULL;
 	}
 
+	/* OGR Geometry is empty */
+	if (OGR_G_IsEmpty(src_geom)) {
+		rtinfo("Geometry provided is empty. Returning empty raster");
+
+		if (noband) {
+			rtdealloc(_pixtype);
+			rtdealloc(_init);
+			rtdealloc(_nodata);
+			rtdealloc(_hasnodata);
+			rtdealloc(_value);
+		}
+
+		OSRDestroySpatialReference(src_sr);
+		/* OGRCleanupAll(); */
+
+		return rt_raster_new(0, 0);
+	}
+
 	/* get envelope */
 	OGR_G_GetEnvelope(src_geom, &src_env);
 	rt_util_from_ogr_envelope(src_env, &extent);
diff --git a/raster/rt_pg/rt_pg.c b/raster/rt_pg/rt_pg.c
index 1f28133ea..bca35f09b 100644
--- a/raster/rt_pg/rt_pg.c
+++ b/raster/rt_pg/rt_pg.c
@@ -10628,6 +10628,26 @@ Datum RASTER_asRaster(PG_FUNCTION_ARGS)
 		geom = geom2d;
 	}
 
+	/* empty geometry, return empty raster */
+	if (lwgeom_is_empty(geom)) {
+		POSTGIS_RT_DEBUG(3, "Input geometry is empty. Returning empty raster");
+		lwgeom_free(geom);
+		PG_FREE_IF_COPY(gser, 0);
+
+		rast = rt_raster_new(0, 0);
+		if (rast == NULL)
+			PG_RETURN_NULL();
+
+		pgrast = rt_raster_serialize(rast);
+		rt_raster_destroy(rast);
+
+		if (NULL == pgrast)
+			PG_RETURN_NULL();
+
+		SET_VARSIZE(pgrast, pgrast->size);
+		PG_RETURN_POINTER(pgrast);
+	}
+
 	/* scale x */
 	if (!PG_ARGISNULL(1)) {
 		scale[0] = PG_GETARG_FLOAT8(1);
-- 
2.50.1