diff options
author | Michael Niedermayer <michael@niedermayer.cc> | 2018-08-05 18:06:44 +0300 |
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committer | Michael Niedermayer <michael@niedermayer.cc> | 2018-09-28 02:25:17 +0300 |
commit | 5f84fbce08769fb21d8459b81e9aad53635008b7 (patch) | |
tree | f0660eff0c6fc00d09b308a7a96ab70bab06726b /libavcodec/gdv.c | |
parent | d021729efc1fe3480326c29f7dbb8d0e56ea4c71 (diff) |
avcodec/gdv: Eliminate 50% of the reads in the first inner loop in rescale()
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'libavcodec/gdv.c')
-rw-r--r-- | libavcodec/gdv.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/libavcodec/gdv.c b/libavcodec/gdv.c index 595d8ff4e4..aea15a88ef 100644 --- a/libavcodec/gdv.c +++ b/libavcodec/gdv.c @@ -85,9 +85,15 @@ static void rescale(GDVContext *gdv, uint8_t *dst, int w, int h, int scale_v, in int y = h - j - 1; uint8_t *dst1 = dst + PREAMBLE_SIZE + y * w; uint8_t *src1 = dst + PREAMBLE_SIZE + (y>>!!gdv->scale_h) * (w>>1); - for (x = w - 1; x >= 0; x--) { + + for (x = w - 1; x >= 0 && !(x&1); x--) { dst1[x] = src1[(x>>1)]; } + + for (x--; x >= 0; x-=2) { + dst1[x ] = + dst1[x+1] = src1[(x>>1)]; + } } } else if (gdv->scale_h) { for (j = 0; j < h; j++) { |