avcodec/pngdec: use av_mod_uintp2

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc> Signed-off-by: James Almer <jamrial@gmail.com>
9 years ago · 1bb3b90db8
parent 8514f6dcfd
commit 1bb3b90db8
1 changed files with 1 additions and 1 deletions
--- a/libavcodec/pngdec.c
+++ b/libavcodec/pngdec.c
@ -787,7 +787,7 @@ static int decode_trns_chunk(AVCodecContext *avctx, PNGDecContext *s,

        for (i = 0; i < length / 2; i++) {
            /* only use the least significant bits */
-            v = bytestream2_get_be16(&s->gb) & ((1 << s->bit_depth) - 1);
+            v = av_mod_uintp2(bytestream2_get_be16(&s->gb), s->bit_depth);

            if (s->bit_depth > 8)
                AV_WB16(&s->transparent_color_be[2 * i], v);