more dissolve optimisation

git-svn-id: https://mlt.svn.sourceforge.net/svnroot/mlt/trunk/mlt@157 d19143bc-622f-0410-bfdd-b5b2a6649095

diff --git a/src/modules/core/transition_luma.c b/src/modules/core/transition_luma.c
index e77999c41e9cbe46fab1c5d6d18ec2c5de46aab0..167d4cfebd6a6af465b1912496d4270e7ce1ed83 100644 (file)
--- a/src/modules/core/transition_luma.c
+++ b/src/modules/core/transition_luma.c
@@ -95,48 +95,24 @@ static float delta_calculate( mlt_transition this, mlt_frame frame )
        return ( y - x ) / 2.0;
 }
 
-static inline int dissolve_yuv( mlt_frame this, mlt_frame that, float weight, int *width, int *height )
+static inline int dissolve_yuv( mlt_frame this, mlt_frame that, float weight, int width, int height )
 {
        int ret = 0;
-       int width_src = *width, height_src = *height;
-       int width_dest = *width, height_dest = *height;
-       mlt_image_format format_src = mlt_image_yuv422, format_dest = mlt_image_yuv422;
+       int width_src = width, height_src = height;
+       mlt_image_format format = mlt_image_yuv422;
        uint8_t *p_src, *p_dest;
-       int i, j;
-       int stride_src;
-       int stride_dest;
-
-       format_src = mlt_image_yuv422;
-       format_dest = mlt_image_yuv422;
-
-       mlt_frame_get_image( this, &p_dest, &format_dest, &width_dest, &height_dest, 1 /* writable */ );
-       mlt_frame_get_image( that, &p_src, &format_src, &width_src, &height_src, 0 /* writable */ );
-
-       stride_src = width_src << 1;
-       stride_dest = width_dest << 1;
-       
-       uint8_t *p = p_src;
-       uint8_t *q = p_dest;
-       uint8_t *o = p_dest;
-
-       uint8_t Y;
-       uint8_t UV;
        float weight_complement = 1 - weight;
+       uint8_t *p;
+       uint8_t *limit;
 
-       // now do the compositing only to cropped extents
-       for ( i = 0; i < height_src; i++ )
-       {
-               p = &p_src[ i * stride_src ];
-               o = q = &p_dest[ i * stride_dest ];
+       mlt_frame_get_image( this, &p_dest, &format, &width, &height, 1 /* writable */ );
+       mlt_frame_get_image( that, &p_src, &format, &width_src, &height_src, 0 /* writable */ );
+       
+       p = p_dest;
+       limit = p_dest + height_src * width_src * 2;
 
-               for ( j = 0; j < width_src; j ++ )
-               {
-                       Y = *p ++;
-                       UV = *p ++;
-                       *o ++ = (uint8_t)( Y * weight + *q++ * weight_complement );
-                       *o ++ = (uint8_t)( UV * weight + *q++ * weight_complement );
-               }
-       }
+       while ( p < limit )
+               *p_dest++ = ( uint8_t )( *p_src++ * weight + *p++ * weight_complement );
 
        return ret;
 }
@@ -259,7 +235,7 @@ static int transition_get_image( mlt_frame this, uint8_t **image, mlt_image_form
                        luma_softness, progressive ? -1 : top_field_first, width, height );
        else
                // Dissolve the frames using the time offset for mix value
-               dissolve_yuv( this, b_frame, mix, width, height );
+               dissolve_yuv( this, b_frame, mix, *width, *height );
 
        // Extract the a_frame image info
        *width = mlt_properties_get_int( a_props, "width" );