SWAP

Originally committed as revision 6030 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/mpegvideo.c

@@ -1687,7 +1687,7 @@ void MPV_frame_end(MpegEncContext *s)
  * @param color color of the arrow
  */
 static void draw_line(uint8_t *buf, int sx, int sy, int ex, int ey, int w, int h, int stride, int color){
-    int t, x, y, fr, f;
+    int x, y, fr, f;
 
     sx= clip(sx, 0, w-1);
     sy= clip(sy, 0, h-1);
@@ -1698,8 +1698,8 @@ static void draw_line(uint8_t *buf, int sx, int sy, int ex, int ey, int w, int h
 
     if(ABS(ex - sx) > ABS(ey - sy)){
         if(sx > ex){
-            t=sx; sx=ex; ex=t;
+            SWAP(int, sx, ex);
-            t=sy; sy=ey; ey=t;
+            SWAP(int, sy, ey);
         }
         buf+= sx + sy*stride;
         ex-= sx;
@@ -1712,8 +1712,8 @@ static void draw_line(uint8_t *buf, int sx, int sy, int ex, int ey, int w, int h
         }
     }else{
         if(sy > ey){
-            t=sx; sx=ex; ex=t;
+            SWAP(int, sx, ex);
-            t=sy; sy=ey; ey=t;
+            SWAP(int, sy, ey);
         }
         buf+= sx + sy*stride;
         ey-= sy;

libavutil/common.h

@@ -169,6 +169,8 @@ typedef uint64_t      uint_fast64_t;
 #define FFMAX(a,b) ((a) > (b) ? (a) : (b))
 #define FFMIN(a,b) ((a) > (b) ? (b) : (a))
 
+#define SWAP(type,a,b) do{type SWAP_tmp= b; b= a; a= SWAP_tmp;}while(0)
+
 /* misc math functions */
 extern FF_IMPORT_ATTR const uint8_t ff_log2_tab[256];