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Merge pull request #1776 from mstorsjo/mc-test-fix

Avoid writing outside of the target rect in MCHalfPelFilterAnchor

--- a/test/encoder/EncUT_MotionCompensation.cpp

+++ b/test/encoder/EncUT_MotionCompensation.cpp

@@ -49,7 +49,8 @@

       pDstH[x] = Clip255 ((FILTER6TAP (pSrc, x, 1) + 16) >> 5);

     for (int32_t x = -2; x < iWidth + 3; x++) {

       int32_t v = FILTER6TAP (pSrc, x, iStride);

-      pDstV[x] = Clip255 ((v + 16) >> 5);

+      if (x >= 0 && x < iWidth)

+        pDstV[x] = Clip255 ((v + 16) >> 5);

       pBuf[x + 2] = v;

     }

     for (int32_t x = 0; x < iWidth; x++)