utvideoenc: use av_image_copy_plane()

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavcodec/utvideoenc.c

@@ -24,6 +24,7 @@
  * Ut Video encoder
  */
 
+#include "libavutil/imgutils.h"
 #include "libavutil/intreadwrite.h"
 #include "avcodec.h"
 #include "internal.h"
@@ -230,20 +231,6 @@ static void mangle_rgb_planes(uint8_t *dst[4], int dst_stride, uint8_t *src,
     }
 }
 
-/* Write data to a plane, no prediction applied */
-static void write_plane(uint8_t *src, uint8_t *dst, int stride,
-                        int width, int height)
-{
-    int i, j;
-
-    for (j = 0; j < height; j++) {
-        for (i = 0; i < width; i++)
-            *dst++ = src[i];
-
-        src += stride;
-    }
-}
-
 /* Write data to a plane with left prediction */
 static void left_predict(uint8_t *src, uint8_t *dst, int stride,
                          int width, int height)
@@ -383,8 +370,9 @@ static int encode_plane(AVCodecContext *avctx, uint8_t *src,
         for (i = 0; i < c->slices; i++) {
             sstart = send;
             send   = height * (i + 1) / c->slices;
-            write_plane(src + sstart * stride, dst + sstart * width,
-                        stride, width, send - sstart);
+            av_image_copy_plane(dst + sstart * width, width,
+                                src + sstart * stride, stride,
+                                width, send - sstart);
         }
         break;
     case PRED_LEFT: