Add edge to sobel buffers to avoid overwrites.

BUG=296
TESTED=Sobel unittest in Effects
R=tpsiaki@google.com

Review URL: https://webrtc-codereview.appspot.com/6429004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@930 16f28f9a-4ce2-e073-06de-1de4eb20be90

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 929
+Version: 930
 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 929
+#define LIBYUV_VERSION 930
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT

source/planar_functions.cc

@@ -1908,10 +1908,10 @@ static int ARGBSobelize(const uint8* src_argb, int src_stride_argb,
   }
 #endif
   // 3 rows with edges before/after.
-  const int kRowSize = (width + 15) & ~15;
-  align_buffer_64(row_y, kEdge + kRowSize * 3);
-  align_buffer_64(row_sobelx, width);
-  align_buffer_64(row_sobely, width);
+  const int kRowSize = (width + kEdge + 15) & ~15;
+  align_buffer_64(row_y, kEdge + kRowSize * 3 + kEdge);
+  align_buffer_64(row_sobelx, width + kEdge);
+  align_buffer_64(row_sobely, width + kEdge);
 
   // Convert first row.
   uint8* row_y0 = row_y + kEdge;
@@ -1919,7 +1919,7 @@ static int ARGBSobelize(const uint8* src_argb, int src_stride_argb,
   uint8* row_y2 = row_y1 + kRowSize;
   ARGBToBayerRow(src_argb, row_y0, 0x0d090501, width);
   row_y0[-1] = row_y0[0];
-  memset(row_y0 + width, row_y0[width - 1], 16);  // extrude 16 pixels.
+  memset(row_y0 + width, row_y0[width - 1], 16);  // Extrude 16 for valgrind.
   ARGBToBayerRow(src_argb, row_y1, 0x0d090501, width);
   row_y1[-1] = row_y1[0];
   memset(row_y1 + width, row_y1[width - 1], 16);