clone alpha on whan cloning image

diff --git a/src/framework/mlt_frame.c b/src/framework/mlt_frame.c
index 612592932a7df6d7834780178e59b114a3c9759f..723e7feb7e00bf67b7cda788005257c344448d12 100644 (file)
--- a/src/framework/mlt_frame.c
+++ b/src/framework/mlt_frame.c
@@ -1023,6 +1023,17 @@ mlt_frame mlt_frame_clone( mlt_frame self, int is_deep )
                        copy = mlt_pool_alloc( size );
                        memcpy( copy, data, size );
                        mlt_properties_set_data( new_props, "image", copy, size, mlt_pool_release, NULL );
+
+                       data = mlt_properties_get_data( properties, "alpha", &size );
+                       if ( data )
+                       {
+                               if ( ! size )
+                                       size = mlt_properties_get_int( properties, "width" ) *
+                                               mlt_properties_get_int( properties, "height" );
+                               copy = mlt_pool_alloc( size );
+                               memcpy( copy, data, size );
+                               mlt_properties_set_data( new_props, "alpha", copy, size, mlt_pool_release, NULL );
+                       };
                }
        }
        else
@@ -1037,6 +1048,8 @@ mlt_frame mlt_frame_clone( mlt_frame self, int is_deep )
                mlt_properties_set_data( new_props, "audio", data, size, NULL, NULL );
                data = mlt_properties_get_data( properties, "image", &size );
                mlt_properties_set_data( new_props, "image", data, size, NULL, NULL );
+               data = mlt_properties_get_data( properties, "alpha", &size );
+               mlt_properties_set_data( new_props, "alpha", data, size, NULL, NULL );
        }
 
        return new_frame;