Swap x and dx to get slope right.

BUG=none
TEST=ARGBScaleClipFrom320x240_Bilinear
R=tpsiaki@google.com

Review URL: https://webrtc-codereview.appspot.com/5299004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@898 16f28f9a-4ce2-e073-06de-1de4eb20be90

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 897
+Version: 898
 License: BSD
 License File: LICENSE
 

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_  // NOLINT
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 897
+#define LIBYUV_VERSION 898
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT

source/scale_argb.cc

@@ -589,12 +589,12 @@ static void ScaleARGB(const uint8* src, int src_stride,
     src_stride = -src_stride;
   }
   // Initial source x/y coordinate and step values as 16.16 fixed point.
-  int dx = 0;
-  int dy = 0;
   int x = 0;
   int y = 0;
+  int dx = 0;
+  int dy = 0;
   ScaleSlope(src_width, src_height, dst_width, dst_height, filtering,
-             &dx, &dy, &x, &y);
+             &x, &y, &dx, &dy);
   if (clip_x) {
     x += clip_x * dx;
     dst += clip_x * 4;