6 // Table for transforming from zig-zag order to natural order.
7 // We use the same trick as libjpeg here; there are 16 extra entries
8 // after the end of the table, since the run-length decoder could
9 // potentially cause entries indices >= 64 to be decoded.
10 static const unsigned unzigzag[DCTSIZE2 + 16] = {
12 0, 1, 8, 16, 9, 2, 3, 10,
13 17, 24, 32, 25, 18, 11, 4, 5,
14 12, 19, 26, 33, 40, 48, 41, 34,
15 27, 20, 13, 6, 7, 14, 21, 28,
16 35, 42, 49, 56, 57, 50, 43, 36,
17 29, 22, 15, 23, 30, 37, 44, 51,
18 58, 59, 52, 45, 38, 31, 39, 46,
19 53, 60, 61, 54, 47, 55, 62, 63,
21 // Extra padding entries; should never be referenced in well-formed data.
22 63, 63, 63, 63, 63, 63, 63, 63,
23 63, 63, 63, 63, 63, 63, 63, 63,
26 #endif /* !defined(_ZIGZAG_H) */