Add a RegionDuplicate function

This allocates a new region structure and copies a source region into
it in a single API rather than forcing the caller to do both steps themselves.

Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/dix/region.c b/dix/region.c
index 737d2a861..15f3d01a5 100644
--- a/dix/region.c
+++ b/dix/region.c
@@ -255,6 +255,21 @@ RegionDestroy(RegionPtr pReg)
         free(pReg);
 }
 
+RegionPtr
+RegionDuplicate(RegionPtr pOld)
+{
+    RegionPtr   pNew;
+
+    pNew = RegionCreate(&pOld->extents, 0);
+    if (!pNew)
+        return NULL;
+    if (!RegionCopy(pNew, pOld)) {
+        RegionDestroy(pNew);
+        return NULL;
+    }
+    return pNew;
+}
+
 void
 RegionPrint(RegionPtr rgn)
 {