From 9d9c19d7c14aad9e439a5bdf648b190bd97a0f27 Mon Sep 17 00:00:00 2001
From: Bborie Park <bkpark at ucdavis.edu>
Date: Fri, 24 Feb 2012 17:33:48 +0000
Subject: [PATCH] Added additional conditions for rt_raster_gdal_rasterize()
 determining when to expand the extent.

git-svn-id: http://svn.osgeo.org/postgis/trunk@9286 b70326c6-7e19-0410-871a-916f4a2858ee
---
 raster/rt_core/rt_api.c                    | 45 ++++++++++++++++++----
 raster/test/regress/rt_intersects_expected |  8 ++--
 2 files changed, 41 insertions(+), 12 deletions(-)

diff --git a/raster/rt_core/rt_api.c b/raster/rt_core/rt_api.c
index d1e32dad2..ef5d60bc2 100644
--- a/raster/rt_core/rt_api.c
+++ b/raster/rt_core/rt_api.c
@@ -8915,16 +8915,45 @@ rt_raster_gdal_rasterize(const unsigned char *wkb,
 
 #if POSTGIS_GDAL_VERSION > 18
 		RASTER_DEBUG(3, "Adjusting extent for GDAL > 1.8 by half the scale");
-		src_env.MinX -= (_scale[0] / 2.);
-		src_env.MaxX += (_scale[0] / 2.);
-		src_env.MinY -= (_scale[1] / 2.);
-		src_env.MaxY += (_scale[1] / 2.);
+
+		if (
+			FLT_EQ((src_env.MaxX - src_env.MinX), 0) ||
+			(wkbtype == wkbMultiPoint) ||
+			(wkbtype == wkbMultiLineString)
+		) {
+			src_env.MinX -= (_scale[0] / 2.);
+			src_env.MaxX += (_scale[0] / 2.);
+		}
+
+		if (
+			FLT_EQ((src_env.MaxY - src_env.MinY), 0) ||
+			(wkbtype == wkbMultiPoint) ||
+			(wkbtype == wkbMultiLineString)
+		) {
+			src_env.MinY -= (_scale[1] / 2.);
+			src_env.MaxY += (_scale[1] / 2.);
+		}
+
 #else
 		RASTER_DEBUG(3, "Adjusting extent for GDAL <= 1.8 by the scale");
-		src_env.MinX -= _scale[0];
-		src_env.MaxX += _scale[0];
-		src_env.MinY -= _scale[1];
-		src_env.MaxY += _scale[1];
+
+		if (
+			FLT_EQ((src_env.MaxX - src_env.MinX), 0) ||
+			(wkbtype == wkbMultiPoint) ||
+			(wkbtype == wkbMultiLineString)
+		) {
+			src_env.MinX -= _scale[0];
+			src_env.MaxX += _scale[0];
+		}
+
+		if (
+			FLT_EQ((src_env.MaxY - src_env.MinY), 0) ||
+			(wkbtype == wkbMultiPoint) ||
+			(wkbtype == wkbMultiLineString)
+		) {
+			src_env.MinY -= _scale[1];
+			src_env.MaxY += _scale[1];
+		}
 #endif
 
 	}
diff --git a/raster/test/regress/rt_intersects_expected b/raster/test/regress/rt_intersects_expected
index e47990fc3..a17cebb1d 100644
--- a/raster/test/regress/rt_intersects_expected
+++ b/raster/test/regress/rt_intersects_expected
@@ -188,7 +188,7 @@ NOTICE:  table "raster_intersects_geom" does not exist, skipping
 2.5|0|25|ST_LineString|f
 2.5|0|26|ST_LineString|t
 2.5|0|27|ST_LineString|t
-2.5|0|28|ST_LineString|t
+2.5|0|28|ST_LineString|f
 2.5|0|29|ST_LineString|f
 2.5|0|31|ST_Polygon|t
 2.5|0|32|ST_Polygon|t
@@ -217,10 +217,10 @@ NOTICE:  table "raster_intersects_geom" does not exist, skipping
 2.6|2|15|ST_MultiPoint|t
 2.6|2|21|ST_LineString|t
 2.6|2|22|ST_LineString|t
-2.6|2|23|ST_LineString|t
-2.6|2|24|ST_LineString|t
+2.6|2|23|ST_LineString|f
+2.6|2|24|ST_LineString|f
 2.6|2|25|ST_LineString|t
-2.6|2|26|ST_LineString|t
+2.6|2|26|ST_LineString|f
 2.6|2|27|ST_LineString|t
 2.6|2|28|ST_LineString|t
 2.6|2|29|ST_LineString|t
-- 
2.40.0