- if ( this != NULL && this->get_alpha_mask != NULL )
- return this->get_alpha_mask( this );
- return this == NULL ? NULL : mlt_properties_get_data( &this->parent, "alpha", NULL );
+ uint8_t *alpha = NULL;
+ if ( this != NULL )
+ {
+ if ( this->get_alpha_mask != NULL )
+ alpha = this->get_alpha_mask( this );
+ if ( alpha == NULL )
+ alpha = mlt_properties_get_data( &this->parent, "alpha", NULL );
+ if ( alpha == NULL )
+ {
+ int size = mlt_properties_get_int( &this->parent, "scaled_width" ) * mlt_properties_get_int( &this->parent, "scaled_height" );
+ alpha = mlt_pool_alloc( size );
+ memset( alpha, 255, size );
+ mlt_properties_set_data( &this->parent, "alpha", alpha, size, mlt_pool_release, NULL );
+ }
+ }
+ return alpha;