int avpriv_set_systematic_pal2(uint32_t pal[256], enum AVPixelFormat pix_fmt);
+static av_always_inline av_const int avpriv_mirror(int x, int w)
+{
+ if (!w)
+ return 0;
+
+ while ((unsigned)x > (unsigned)w) {
+ x = -x;
+ if (x < 0)
+ x += 2 * w;
+ }
+ return x;
+}
+
#if FF_API_GET_CHANNEL_LAYOUT_COMPAT
uint64_t ff_get_channel_layout(const char *name, int compat);
#endif