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avcodec/tiff: Factor constant computation out of inner loop 

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-04-11 03:37:35 +02:00
parent 2b4cc8d1bb
commit cd8e62746f
1 changed files with 2 additions and 1 deletions
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3
libavcodec/tiff.c
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@ -1362,10 +1362,11 @@ static int decode_frame(AVCodecContext *avctx,
}
if (s->photometric == TIFF_PHOTOMETRIC_WHITE_IS_ZERO) {
int c = (s->avctx->pix_fmt == AV_PIX_FMT_PAL8 ? (1<<s->bpp) - 1 : 255);
dst = p->data[plane];
for (i = 0; i < s->height; i++) {
for (j = 0; j < stride; j++)
dst[j] = (s->avctx->pix_fmt == AV_PIX_FMT_PAL8 ? (1<<s->bpp) - 1 : 255) - dst[j];
dst[j] = c - dst[j];
dst += stride;
}
}