From a3359f5d2c736b8e5a3fc5f9194c845de6b46d46 Mon Sep 17 00:00:00 2001
From: skal <pascal.massimino@gmail.com>
Date: Tue, 10 Dec 2013 05:36:23 +0100
Subject: [PATCH] Only compute quantization params once

(all quantization params #1..#15 are the same)

Change-Id: If04058bd89fe2677b5b118ee4e1bcce88f0e4bf5
---
 src/enc/quant.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/src/enc/quant.c b/src/enc/quant.c
index 3f1ae8e7..3ad49499 100644
--- a/src/enc/quant.c
+++ b/src/enc/quant.c
@@ -188,12 +188,8 @@ static const uint8_t kFreqSharpening[16] = {
 
 // Returns the average quantizer
 static int ExpandMatrix(VP8Matrix* const m, int type) {
-  int i;
-  int sum = 0;
-  for (i = 2; i < 16; ++i) {
-    m->q_[i] = m->q_[1];
-  }
-  for (i = 0; i < 16; ++i) {
+  int i, sum;
+  for (i = 0; i < 2; ++i) {
     const int is_ac_coeff = (i > 0);
     const int bias = kBiasMatrices[type][is_ac_coeff];
     m->iq_[i] = (1 << QFIX) / m->q_[i];
@@ -202,6 +198,14 @@ static int ExpandMatrix(VP8Matrix* const m, int type) {
     //   * zero if coeff <= zthresh
     //   * non-zero if coeff > zthresh
     m->zthresh_[i] = ((1 << QFIX) - 1 - m->bias_[i]) / m->iq_[i];
+  }
+  for (i = 2; i < 16; ++i) {
+    m->q_[i] = m->q_[1];
+    m->iq_[i] = m->iq_[1];
+    m->bias_[i] = m->bias_[1];
+    m->zthresh_[i] = m->zthresh_[1];
+  }
+  for (sum = 0, i = 0; i < 16; ++i) {
     if (type == 0) {  // we only use sharpening for AC luma coeffs
       m->sharpen_[i] = (kFreqSharpening[i] * m->q_[i]) >> SHARPEN_BITS;
     } else {