From 6d81609804cf96639d5ba2f8d60b6df59e73ca0f Mon Sep 17 00:00:00 2001
From: Paul Ramsey <pramsey@cleverelephant.ca>
Date: Wed, 1 Feb 2012 23:18:19 +0000
Subject: [PATCH] Add lwcollection_homogenize and ST_Homogenize (#375)

git-svn-id: http://svn.osgeo.org/postgis/trunk@9009 b70326c6-7e19-0410-871a-916f4a2858ee
---
 liblwgeom/lwhomogenize.c         |  2 ++
 postgis/lwgeom_functions_basic.c | 21 +++++++++++++++++++++
 postgis/postgis.sql.in.c         |  6 ++++++
 3 files changed, 29 insertions(+)

diff --git a/liblwgeom/lwhomogenize.c b/liblwgeom/lwhomogenize.c
index 104f6c053..a074b68e2 100644
--- a/liblwgeom/lwhomogenize.c
+++ b/liblwgeom/lwhomogenize.c
@@ -31,6 +31,7 @@ init_homogenizebuffer(HomogenizeBuffer *buffer)
 	}
 }
 
+/*
 static void
 free_homogenizebuffer(HomogenizeBuffer *buffer)
 {
@@ -43,6 +44,7 @@ free_homogenizebuffer(HomogenizeBuffer *buffer)
 		}
 	}
 }
+*/
 
 /*
 ** Given a generic collection, return the "simplest" form.
diff --git a/postgis/lwgeom_functions_basic.c b/postgis/lwgeom_functions_basic.c
index 9fdfcc8f0..f90de7fcb 100644
--- a/postgis/lwgeom_functions_basic.c
+++ b/postgis/lwgeom_functions_basic.c
@@ -2558,6 +2558,27 @@ Datum ST_CollectionExtract(PG_FUNCTION_ARGS)
 	PG_RETURN_POINTER(output);
 }
 
+PG_FUNCTION_INFO_V1(ST_CollectionHomogenize);
+Datum ST_CollectionHomogenize(PG_FUNCTION_ARGS)
+{
+	GSERIALIZED *input = (GSERIALIZED *)PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
+	GSERIALIZED *output;
+	LWGEOM *lwgeom = lwgeom_from_gserialized(input);
+	LWGEOM *lwoutput = NULL;
+
+	lwoutput = lwgeom_homogenize(lwgeom);
+	lwgeom_free(lwgeom);
+	PG_FREE_IF_COPY(input, 0);
+
+	if ( ! lwoutput )
+		PG_RETURN_NULL();
+
+	output = geometry_serialize(lwoutput);
+	lwgeom_free(lwoutput);
+
+	PG_RETURN_POINTER(output);
+}
+
 Datum ST_RemoveRepeatedPoints(PG_FUNCTION_ARGS);
 PG_FUNCTION_INFO_V1(ST_RemoveRepeatedPoints);
 Datum ST_RemoveRepeatedPoints(PG_FUNCTION_ARGS)
diff --git a/postgis/postgis.sql.in.c b/postgis/postgis.sql.in.c
index 5db961d93..92e8d6c76 100644
--- a/postgis/postgis.sql.in.c
+++ b/postgis/postgis.sql.in.c
@@ -1102,6 +1102,12 @@ CREATE OR REPLACE FUNCTION ST_CollectionExtract(geometry, integer)
 	AS 'MODULE_PATHNAME', 'ST_CollectionExtract'
 	LANGUAGE 'C' IMMUTABLE STRICT;
 
+-- Availability: 2.0.0
+CREATE OR REPLACE FUNCTION ST_CollectionHomogenize(geometry)
+	RETURNS geometry
+	AS 'MODULE_PATHNAME', 'ST_CollectionHomogenize'
+	LANGUAGE 'C' IMMUTABLE STRICT;
+
 -- Availability: 1.2.2
 CREATE OR REPLACE FUNCTION ST_Multi(geometry)
 	RETURNS geometry
-- 
2.40.0