shithub: libvpx

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ref: bc3dd313efd41ec996abe306a404e690a0f4ab78
parent: a96bf2038cd55f762d6468bdc61a0c946a7fefa1
parent: efa9abd02891855afc40670cc874922a5c1fcb1b
author: Yaowu Xu <yaowu@google.com>
date: Thu Feb 16 10:33:01 EST 2012 

Merge "optmized rounding for transforms" into experimental


--- a/vp8/common/idctllm.c
+++ b/vp8/common/idctllm.c
@@ -396,7 +396,8 @@
     {
         for (j = 0; j < TX_DIM; j++)
         {
-             X[i * TX_DIM + j] = (int)(coefs[i * TX_DIM + j]+2)>>2;
+             X[i * TX_DIM + j] = (int)(coefs[i * TX_DIM + j]+1
+                                    + (coefs[i * TX_DIM + j]<0))>>2;
         }
     }
   for (i = 0; i < 8; i++)
@@ -487,7 +488,7 @@
        op[i] = 0;
    }
 
-   op[0] = (ip[0] + ip[1] + ip[4] + ip[8])>>1;
+   op[0] = (ip[0] + ip[1] + ip[4] + ip[8] + 1)>>1;
    op[1] = (ip[0] - ip[1] + ip[4] - ip[8])>>1;
    op[4] = (ip[0] + ip[1] - ip[4] - ip[8])>>1;
    op[8] = (ip[0] - ip[1] - ip[4] + ip[8])>>1;
--- a/vp8/encoder/dct.c
+++ b/vp8/encoder/dct.c
@@ -120,7 +120,7 @@
        op1[i] = 0;
    }
 
-   op1[0]=(ip1[0] + ip1[1] + ip1[4] + ip1[8])>>1;
+   op1[0]=(ip1[0] + ip1[1] + ip1[4] + ip1[8] + 1)>>1;
    op1[1]=(ip1[0] - ip1[1] + ip1[4] - ip1[8])>>1;
    op1[4]=(ip1[0] + ip1[1] - ip1[4] - ip1[8])>>1;
    op1[8]=(ip1[0] - ip1[1] - ip1[4] + ip1[8])>>1;