Flexible and animated shapes

git-svn-id: https://mlt.svn.sourceforge.net/svnroot/mlt/trunk/mlt@355 d19143bc-622f-0410-bfdd-b5b2a6649095

diff --git a/src/modules/core/transition_region.c b/src/modules/core/transition_region.c
index 2cbc978..e8391c5 100644 (file)
--- a/src/modules/core/transition_region.c
+++ b/src/modules/core/transition_region.c
@@ -91,6 +91,8 @@ static int create_instance( mlt_transition this, char *name, char *value, int co
 
 static uint8_t *filter_get_alpha_mask( mlt_frame this )
 {
+       uint8_t *alpha = NULL;
+
        // Obtain properties of frame
        mlt_properties properties = mlt_frame_properties( this );
 
@@ -107,7 +109,24 @@ static uint8_t *filter_get_alpha_mask( mlt_frame this )
        mlt_properties_set( mlt_frame_properties( shape_frame ), "distort", "true" );
        mlt_frame_get_image( shape_frame, &image, &format, &region_width, &region_height, 0 );
 
-       return mlt_frame_get_alpha_mask( shape_frame );
+       alpha = mlt_frame_get_alpha_mask( shape_frame );
+
+       // Generate from the Y component of the image if no alpha available
+       if ( alpha == NULL )
+       {
+               int size = region_width * region_height;
+               uint8_t *p = mlt_pool_alloc( size );
+               alpha = p;
+               while ( size -- )
+               {
+                       *p ++ = *image ++;
+                       image ++;
+               }
+               mlt_properties_set_data( mlt_frame_properties( shape_frame ), "alpha", alpha, 
+                                                                region_width * region_height, mlt_pool_release, NULL );
+       }
+
+       return alpha;
 }
 
 /** Do it :-).