I400 invert support which fixes a valgrind bug

BUG=117
TEST=I400ToI400Invert_OptVsC
Review URL: https://webrtc-codereview.appspot.com/859010

git-svn-id: http://libyuv.googlecode.com/svn/trunk@398 16f28f9a-4ce2-e073-06de-1de4eb20be90

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 397
+Version: 398
 License: BSD
 License File: LICENSE
 

include/libyuv/planar_functions.h

@@ -27,8 +27,11 @@ void SetPlane(uint8* dst_y, int dst_stride_y,
               int width, int height,
               uint32 value);
 
-// Alias.
-#define I400ToI400 CopyPlane
+// Copy I400.  Supports inverting.
+LIBYUV_API
+int I400ToI400(const uint8* src_y, int src_stride_y,
+               uint8* dst_y, int dst_stride_y,
+               int width, int height);
 
 // Copy a plane of data (I420 to I400).
 LIBYUV_API

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_  // NOLINT
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 397
+#define LIBYUV_VERSION 398
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT

source/planar_functions.cc

@@ -55,6 +55,24 @@ void CopyPlane(const uint8* src_y, int src_stride_y,
   }
 }
 
+// Copy I400.
+LIBYUV_API
+int I400ToI400(const uint8* src_y, int src_stride_y,
+               uint8* dst_y, int dst_stride_y,
+               int width, int height) {
+  if (!src_y || !dst_y || width <= 0 || height == 0) {
+    return -1;
+  }
+  // Negative height means invert the image.
+  if (height < 0) {
+    height = -height;
+    src_y = src_y + (height - 1) * src_stride_y;
+    src_stride_y = -src_stride_y;
+  }
+  CopyPlane(src_y, src_stride_y, dst_y, dst_stride_y, width, height);
+  return 0;
+}
+
 // Convert I420 to I400.
 LIBYUV_API
 int I420ToI400(const uint8* src_y, int src_stride_y,