+ Correction and a minor optimisation

git-svn-id: https://mlt.svn.sourceforge.net/svnroot/mlt/trunk/mlt@832 d19143bc-622f-0410-bfdd-b5b2a6649095

diff --git a/src/modules/avformat/consumer_avformat.c b/src/modules/avformat/consumer_avformat.c
index 8eaabce585d3bab573c8be28d5adfe9c139be090..dfa1c6b5db54fd96a5458edea40ca94d62f20dcb 100644 (file)
--- a/src/modules/avformat/consumer_avformat.c
+++ b/src/modules/avformat/consumer_avformat.c
@@ -915,18 +915,29 @@ static void *consumer_thread( void *arg )
                                                if ( video_st->codec->pix_fmt == PIX_FMT_RGBA32 )
                                                {
                                                        uint8_t *alpha = mlt_frame_get_alpha_mask( frame );
+                                                       register int n;
 
                                                        for ( i = 0; i < height; i ++ )
                                                        {
-                                                               p = input->data[ 0 ] + i * input->linesize[ 0 ];
+                                                               n = ( width + 7 ) / 8;
+                                                               p = output->data[ 0 ] + i * output->linesize[ 0 ];
+
                                                                #ifndef __DARWIN__
                                                                p += 3;
                                                                #endif
-                                                               j = width;
-                                                               while( j -- )
+
+                                                               switch( width % 8 )
                                                                {
-                                                                       *p = *alpha ++;
-                                                                       *p += 4;
+                                                                       case 0: do { *p = *alpha++; p += 4;
+                                                                       case 7:          *p = *alpha++; p += 4;
+                                                                       case 6:          *p = *alpha++; p += 4;
+                                                                       case 5:          *p = *alpha++; p += 4;
+                                                                       case 4:          *p = *alpha++; p += 4;
+                                                                       case 3:          *p = *alpha++; p += 4;
+                                                                       case 2:          *p = *alpha++; p += 4;
+                                                                       case 1:          *p = *alpha++; p += 4;
+                                                                                       }
+                                                                                       while( --n );
                                                                }
                                                        }
                                                }