From 7cdce8cb55e7af25b88b45b6338402baad1e9ec9 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Sun, 21 Dec 2014 00:54:36 +0100
Subject: [PATCH] avfilter/vf_boxblur: factor rounder offset out
3322 -> 3204 cycles
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
libavfilter/vf_boxblur.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
diff --git a/libavfilter/vf_boxblur.c b/libavfilter/vf_boxblur.c
index 1fa5135d980..a908b6d125c 100644
--- a/libavfilter/vf_boxblur.c
+++ b/libavfilter/vf_boxblur.c
@@ -227,19 +227,21 @@ static inline void blur(uint8_t *dst, int dst_step, const uint8_t *src, int src_
sum += src[x*src_step]<<1;
sum += src[radius*src_step];
+ sum = sum*inv + (1<<15);
+
for (x = 0; x <= radius; x++) {
- sum += src[(radius+x)*src_step] - src[(radius-x)*src_step];
- dst[x*dst_step] = (sum*inv + (1<<15))>>16;
+ sum += (src[(radius+x)*src_step] - src[(radius-x)*src_step])*inv;
+ dst[x*dst_step] = sum>>16;
}
for (; x < len-radius; x++) {
- sum += src[(radius+x)*src_step] - src[(x-radius-1)*src_step];
- dst[x*dst_step] = (sum*inv + (1<<15))>>16;
+ sum += (src[(radius+x)*src_step] - src[(x-radius-1)*src_step])*inv;
+ dst[x*dst_step] = sum >>16;
}
for (; x < len; x++) {
- sum += src[(2*len-radius-x-1)*src_step] - src[(x-radius-1)*src_step];
- dst[x*dst_step] = (sum*inv + (1<<15))>>16;
+ sum += (src[(2*len-radius-x-1)*src_step] - src[(x-radius-1)*src_step])*inv;
+ dst[x*dst_step] = sum>>16;
}
}
--
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