[x265] [PATCH 2 of 4] improve ctuLumaLevel logic by Sad and CMOV

[Deepthi Nandakumar]

Kavitha,

Can you please pull this neat optimization of Min's into
picyuv::copyFromPicture?

On Thu, Aug 13, 2015 at 8:52 AM, Min Chen <chenm003 at 163.com> wrote:

> # HG changeset patch
> # User Min Chen <chenm003 at 163.com>
> # Date 1439423217 25200
> # Node ID 09846d1566428a73d70d2fcf2d50324c0dfbbb7f
> # Parent  f627a263bb5c1dcf274ab281a02670449ae891fc
> improve ctuLumaLevel logic by Sad and CMOV
> ---
>  source/encoder/frameencoder.cpp |    7 ++++---
>  1 files changed, 4 insertions(+), 3 deletions(-)
>
> diff -r f627a263bb5c -r 09846d156642 source/encoder/frameencoder.cpp
> --- a/source/encoder/frameencoder.cpp   Wed Aug 12 16:35:27 2015 -0700
> +++ b/source/encoder/frameencoder.cpp   Wed Aug 12 16:46:57 2015 -0700
> @@ -992,13 +992,14 @@
>          }
>
>          /* calculate maximum and average luma levels */
> -        uint32_t ctuLumaLevel = 0;
> +        static const pixel dummy_zero[MAX_CU_SIZE] = {0};
> +        uint32_t ctuLumaLevel =
> primitives.pu[best.fencYuv->m_part].sad(best.fencYuv->m_buf[0],
> best.fencYuv->m_size, dummy_zero, 0);
>          uint32_t ctuNoOfPixels = best.fencYuv->m_size *
> best.fencYuv->m_size;
>          for (uint32_t i = 0; i < ctuNoOfPixels; i++)
>          {
>              pixel p = best.fencYuv->m_buf[0][i];
> -            ctuLumaLevel += p;
> -            curRow.rowStats.maxLumaLevel = X265_MAX(p,
> curRow.rowStats.maxLumaLevel);
> +            if (p > curRow.rowStats.maxLumaLevel)
> +                curRow.rowStats.maxLumaLevel = p;
>          }
>          curRow.rowStats.lumaLevel += (double)(ctuLumaLevel) /
> ctuNoOfPixels;
>
>
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