Alpha from the tractor fix

git-svn-id: https://mlt.svn.sourceforge.net/svnroot/mlt/trunk/mlt@439 d19143bc-622f-0410-bfdd-b5b2a6649095

diff --git a/src/framework/mlt_tractor.c b/src/framework/mlt_tractor.c
index 18cae0c..45918d5 100644 (file)
--- a/src/framework/mlt_tractor.c
+++ b/src/framework/mlt_tractor.c
@@ -201,8 +201,14 @@ mlt_producer mlt_tractor_get_track( mlt_tractor this, int index )
        return mlt_multitrack_track( mlt_tractor_multitrack( this ), index );
 }
 
+static uint8_t *mlt_tractor_alpha_mask( mlt_frame frame )
+{
+       return mlt_properties_get_data( mlt_frame_properties( frame ), "alpha", NULL );
+}
+
 static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 {
+       uint8_t *data = NULL;
        mlt_properties properties = mlt_frame_properties( this );
        mlt_frame frame = mlt_frame_pop_service( this );
        mlt_properties_inherit( mlt_frame_properties( frame ), properties );
@@ -211,6 +217,9 @@ static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_forma
        mlt_properties_set_int( properties, "width", *width );
        mlt_properties_set_int( properties, "height", *height );
        mlt_properties_set_double( properties, "aspect_ratio", mlt_frame_get_aspect_ratio( frame ) );
+       data = mlt_frame_get_alpha_mask( frame );
+       mlt_properties_set_data( properties, "alpha", data, 0, NULL, NULL );
+       this->get_alpha_mask = mlt_tractor_alpha_mask;
        return 0;
 }