avcodec/pngdec: fix () in OP_* macros

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
11 years ago · c163f5e601
parent ad733089b0
commit c163f5e601
1 changed files with 2 additions and 2 deletions
--- a/libavcodec/pngdec.c
+++ b/libavcodec/pngdec.c
@ -237,7 +237,7 @@ static void png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type,
                *(int *)(dst + i) = p;
            }
        } else {
-#define OP_SUB(x, s, l) x + s
+#define OP_SUB(x, s, l) ((x) + (s))
            UNROLL_FILTER(OP_SUB);
        }
        break;
@ -249,7 +249,7 @@ static void png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type,
            p      = (last[i] >> 1);
            dst[i] = p + src[i];
        }
-#define OP_AVG(x, s, l) (((x + l) >> 1) + s) & 0xff
+#define OP_AVG(x, s, l) (((((x) + (l)) >> 1) + (s)) & 0xff)
        UNROLL_FILTER(OP_AVG);
        break;
    case PNG_FILTER_VALUE_PAETH: