clamp pointer to max row to avoid stepping off source image.

BUG=292
TESTED=BackgroundOverlayKernelTest.ProcessVideo_ForegroundBackground

Review URL: https://webrtc-codereview.appspot.com/5379004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@905 16f28f9a-4ce2-e073-06de-1de4eb20be90

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 904
+Version: 905
 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 904
+#define LIBYUV_VERSION 905
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT

source/scale.cc

@@ -656,6 +656,7 @@ void ScalePlaneBilinearUp(int src_width, int src_height,
       if (y > max_y) {
         y = max_y;
         yi = y >> 16;
+        src = src_ptr + yi * src_stride;
       }
       if (yi != lasty) {
         ScaleFilterCols(rowptr, src, dst_width, x, dx);

source/scale_argb.cc

@@ -324,6 +324,7 @@ static void ScaleARGBBilinearUp(int src_width, int src_height,
       if (y > max_y) {
         y = max_y;
         yi = y >> 16;
+        src = src_argb + yi * src_stride;
       }
       if (yi != lasty) {
         ScaleARGBFilterCols(rowptr, src, dst_width, x, dx);
@@ -500,6 +501,10 @@ static void ScaleYUVToARGBBilinearUp(int src_width, int src_height,
       if (y > max_y) {
         y = max_y;
         yi = y >> 16;
+        uv_yi = yi >> kYShift;
+        src_row_y = src_y + yi * src_stride_y;
+        src_row_u = src_u + uv_yi * src_stride_u;
+        src_row_v = src_v + uv_yi * src_stride_v;
       }
       if (yi != lasty) {
         // TODO(fbarchard): Convert the clipped region of row.