From e016324d31626e9f1c172ddf107ca7ca2c25d67d Mon Sep 17 00:00:00 2001
From: Julien Isorce <julien.isorce@collabora.co.uk>
Date: Tue, 24 Jun 2014 19:23:01 +0100
Subject: [PATCH] glfilter: prepend intersection to src caps

Prefer to stay in the same memory space if possible.
Also it let a chance to do passthrough.

See https://bugzilla.gnome.org/show_bug.cgi?id=732178
---
 gst-libs/gst/gl/gstglfilter.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/gst-libs/gst/gl/gstglfilter.c b/gst-libs/gst/gl/gstglfilter.c
index 250ae39eea..c0c79f3b11 100644
--- a/gst-libs/gst/gl/gstglfilter.c
+++ b/gst-libs/gst/gl/gstglfilter.c
@@ -757,6 +757,12 @@ gst_gl_filter_transform_caps (GstBaseTransform * bt,
     result = tmp;
   }
 
+  /* if output still intersects input then prefer the intersection */
+  if (direction == GST_PAD_SINK) {
+    tmp = gst_caps_intersect_full (result, caps, GST_CAPS_INTERSECT_FIRST);
+    result = gst_caps_merge (tmp, result);
+  }
+
   GST_DEBUG_OBJECT (bt, "returning caps: %" GST_PTR_FORMAT, result);
 
   return result;