CopyPlane check for contiguous memory and treat image as width * height, 1 image.

BUG=176
TEST=I420ToI420
Review URL: https://webrtc-codereview.appspot.com/1021014

git-svn-id: http://libyuv.googlecode.com/svn/trunk@538 16f28f9a-4ce2-e073-06de-1de4eb20be90

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 537
+Version: 538
 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 537
+#define LIBYUV_VERSION 538
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT

source/planar_functions.cc

@@ -28,6 +28,11 @@ LIBYUV_API
 void CopyPlane(const uint8* src_y, int src_stride_y,
                uint8* dst_y, int dst_stride_y,
                int width, int height) {
+  if (src_stride_y == width && dst_stride_y == width) {
+    CopyPlane(src_y, 0, dst_y, 0, width * height, 1);
+    return;
+  }
+
   void (*CopyRow)(const uint8* src, uint8* dst, int width) = CopyRow_C;
 #if defined(HAS_COPYROW_NEON)
   if (TestCpuFlag(kCpuHasNEON) && IS_ALIGNED(width, 32)) {