[x265] [PATCH 2 of 4] C primitive changes for luma_hps and chroma_hps

[nabajit at multicorewareinc.com]

# HG changeset patch
# User Nabajit Deka
# Date 1386160675 -19800
#      Wed Dec 04 18:07:55 2013 +0530
# Node ID 8b045312625b2ffe16dd555b6958647f105b906d
# Parent  9440e424c637a46e15a96c03739d645e1dbf8b56
C primitive changes for luma_hps and chroma_hps.

diff -r 9440e424c637 -r 8b045312625b source/common/ipfilter.cpp
--- a/source/common/ipfilter.cpp	Wed Dec 04 17:54:14 2013 +0530
+++ b/source/common/ipfilter.cpp	Wed Dec 04 18:07:55 2013 +0530
@@ -270,17 +270,24 @@
 }
 
 template<int N, int width, int height>
-void interp_horiz_ps_c(pixel *src, intptr_t srcStride, int16_t *dst, intptr_t dstStride, int coeffIdx)
+void interp_horiz_ps_c(pixel *src, intptr_t srcStride, int16_t *dst, intptr_t dstStride, int coeffIdx, int isRowExt)
 {
     int16_t const * coeff = (N == 4) ? g_chromaFilter[coeffIdx] : g_lumaFilter[coeffIdx];
     int headRoom = IF_INTERNAL_PREC - X265_DEPTH;
     int shift = IF_FILTER_PREC - headRoom;
     int offset = -IF_INTERNAL_OFFS << shift;
+    int blkheight = height;
 
     src -= N / 2 - 1;
 
+    if (isRowExt)
+    {
+        src -= (N / 2 - 1) * srcStride;
+        blkheight += N - 1;
+    }
+
     int row, col;
-    for (row = 0; row < height; row++)
+    for (row = 0; row < blkheight; row++)
     {
         for (col = 0; col < width; col++)
         {