[x265] [PATCH 3 of 3] improve rdoQuant() by block fill on non-zero coeff group

[Min Chen]

# HG changeset patch
# User Min Chen <chenm003 at 163.com>
# Date 1429017546 -28800
# Node ID 18697529da8a22d57b961c021fdc5019bf20b39c
# Parent  639ba5cea135ed10b1f5a406e15a7e469f0ee68f
improve rdoQuant() by block fill on non-zero coeff group
---
 source/common/quant.cpp |   14 ++++++++++++--
 1 files changed, 12 insertions(+), 2 deletions(-)

diff -r 639ba5cea135 -r 18697529da8a source/common/quant.cpp
--- a/source/common/quant.cpp	Tue Apr 14 21:19:02 2015 +0800
+++ b/source/common/quant.cpp	Tue Apr 14 21:19:06 2015 +0800
@@ -981,10 +981,20 @@
         dstCoeff[blkPos] = (int16_t)((level ^ mask) - mask);
     }
 
-    // TODO: use fast block fill, it is slower in less coeff transform block
+    // Average 49.62 pixels
     /* clean uncoded coefficients */
-    for (int pos = bestLastIdx; pos <= lastScanPos; pos++)
+    for (int pos = bestLastIdx; pos <= fastMin(lastScanPos, (bestLastIdx | (SCAN_SET_SIZE - 1))); pos++)
+    {
         dstCoeff[codeParams.scan[pos]] = 0;
+    }
+    for (int pos = (bestLastIdx & ~(SCAN_SET_SIZE - 1)) + SCAN_SET_SIZE; pos <= lastScanPos; pos += SCAN_SET_SIZE)
+    {
+        const uint32_t blkPos = codeParams.scan[pos];
+        memset(&dstCoeff[blkPos + 0 * trSize], 0, 4 * sizeof(*dstCoeff));
+        memset(&dstCoeff[blkPos + 1 * trSize], 0, 4 * sizeof(*dstCoeff));
+        memset(&dstCoeff[blkPos + 2 * trSize], 0, 4 * sizeof(*dstCoeff));
+        memset(&dstCoeff[blkPos + 3 * trSize], 0, 4 * sizeof(*dstCoeff));
+    }
 
     /* rate-distortion based sign-hiding */
     if (cu.m_slice->m_pps->bSignHideEnabled && numSig >= 2)