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/*
** dithers.h
**
** Here are some dithering matrices. They are all taken from "Digital
** Halftoning" by Robert Ulichney, MIT Press, ISBN 0-262-21009-6.
*/
#if 0
/*
** Order-6 ordered dithering matrix. Note that smaller ordered dithers
** have no advantage over larger ones, so use dither8 instead.
*/
static int const dither6[8][8] = {
{ 1, 59, 15, 55, 2, 56, 12, 52 },
{ 33, 17, 47, 31, 34, 18, 44, 28 },
{ 9, 49, 5, 63, 10, 50, 6, 60 },
{ 41, 25, 37, 21, 42, 26, 38, 22 },
{ 3, 57, 13, 53, 0, 58, 14, 54 },
{ 35, 19, 45, 29, 32, 16, 46, 30 },
{ 11, 51, 7, 61, 8, 48, 4, 62 },
{ 43, 27, 39, 23, 40, 24, 36, 20 }
};
#endif
/* Order-8 ordered dithering matrix. */
static int const dither8[16][16] = {
{ 1,235, 59,219, 15,231, 55,215, 2,232, 56,216, 12,228, 52,212},
{ 129, 65,187,123,143, 79,183,119,130, 66,184,120,140, 76,180,116},
{ 33,193, 17,251, 47,207, 31,247, 34,194, 18,248, 44,204, 28,244},
{ 161, 97,145, 81,175,111,159, 95,162, 98,146, 82,172,108,156, 92},
{ 9,225, 49,209, 5,239, 63,223, 10,226, 50,210, 6,236, 60,220},
{ 137, 73,177,113,133, 69,191,127,138, 74,178,114,134, 70,188,124},
{ 41,201, 25,241, 37,197, 21,255, 42,202, 26,242, 38,198, 22,252},
{ 169,105,153, 89,165,101,149, 85,170,106,154, 90,166,102,150, 86},
{ 3,233, 57,217, 13,229, 53,213, 0,234, 58,218, 14,230, 54,214},
{ 131, 67,185,121,141, 77,181,117,128, 64,186,122,142, 78,182,118},
{ 35,195, 19,249, 45,205, 29,245, 32,192, 16,250, 46,206, 30,246},
{ 163, 99,147, 83,173,109,157, 93,160, 96,144, 80,174,110,158, 94},
{ 11,227, 51,211, 7,237, 61,221, 8,224, 48,208, 4,238, 62,222},
{ 139, 75,179,115,135, 71,189,125,136, 72,176,112,132, 68,190,126},
{ 43,203, 27,243, 39,199, 23,253, 40,200, 24,240, 36,196, 20,254},
{ 171,107,155, 91,167,103,151, 87,168,104,152, 88,164,100,148, 84}
};
/* Order-3 clustered dithering matrix. */
static int const cluster3[6][6] = {
{ 9,11,10, 8, 6, 7},
{ 12,17,16, 5, 0, 1},
{ 13,14,15, 4, 3, 2},
{ 8, 6, 7, 9,11,10},
{ 5, 0, 1,12,17,16},
{ 4, 3, 2,13,14,15}
};
/* Order-4 clustered dithering matrix. */
static int const cluster4[8][8] = {
{ 18,20,19,16,13,11,12,15},
{ 27,28,29,22, 4, 3, 2, 9},
{ 26,31,30,21, 5, 0, 1,10},
{ 23,25,24,17, 8, 6, 7,14},
{ 13,11,12,15,18,20,19,16},
{ 4, 3, 2, 9,27,28,29,22},
{ 5, 0, 1,10,26,31,30,21},
{ 8, 6, 7,14,23,25,24,17}
};
/* Order-8 clustered dithering matrix. */
static int const cluster8[16][16] = {
{ 64, 69, 77, 87, 86, 76, 68, 67, 63, 58, 50, 40, 41, 51, 59, 60},
{ 70, 94,100,109,108, 99, 93, 75, 57, 33, 27, 18, 19, 28, 34, 52},
{ 78,101,114,116,115,112, 98, 83, 49, 26, 13, 11, 12, 15, 29, 44},
{ 88,110,123,124,125,118,107, 85, 39, 17, 4, 3, 2, 9, 20, 42},
{ 89,111,122,127,126,117,106, 84, 38, 16, 5, 0, 1, 10, 21, 43},
{ 79,102,119,121,120,113, 97, 82, 48, 25, 8, 6, 7, 14, 30, 45},
{ 71, 95,103,104,105, 96, 92, 74, 56, 32, 24, 23, 22, 31, 35, 53},
{ 65, 72, 80, 90, 91, 81, 73, 66, 62, 55, 47, 37, 36, 46, 54, 61},
{ 63, 58, 50, 40, 41, 51, 59, 60, 64, 69, 77, 87, 86, 76, 68, 67},
{ 57, 33, 27, 18, 19, 28, 34, 52, 70, 94,100,109,108, 99, 93, 75},
{ 49, 26, 13, 11, 12, 15, 29, 44, 78,101,114,116,115,112, 98, 83},
{ 39, 17, 4, 3, 2, 9, 20, 42, 88,110,123,124,125,118,107, 85},
{ 38, 16, 5, 0, 1, 10, 21, 43, 89,111,122,127,126,117,106, 84},
{ 48, 25, 8, 6, 7, 14, 30, 45, 79,102,119,121,120,113, 97, 82},
{ 56, 32, 24, 23, 22, 31, 35, 53, 71, 95,103,104,105, 96, 92, 74},
{ 62, 55, 47, 37, 36, 46, 54, 61, 65, 72, 80, 90, 91, 81, 73, 66}
};
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