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/*
* Compface - 48x48x1 image compression and decompression
*
* Copyright (c) James Ashton - Sydney University - June 1990.
*
* Written 11th November 1989.
*
* Permission is given to distribute these sources, as long as the
* copyright messages are not removed, and no monies are exchanged.
*
* No responsibility is taken for any errors on inaccuracies inherent
* either to the comments or the code of this program, but if reported
* to me, then an attempt will be made to fix them.
*/
#include "compface.h"
#define EXTERN
#define INIT(x) = x
/* need to know how many bits per hexadecimal digit for io */
EXTERN char HexDigits[] INIT("0123456789ABCDEF");
/* internal face representation - 1 char per pixel is faster */
EXTERN char F[PIXELS];
EXTERN BigInt B;
/* data.h was established by sampling over 1000 faces and icons */
EXTERN Guesses G
=
#include "data.h"
;
/* A stack of probability values */
EXTERN Prob *ProbBuf[PIXELS * 2];
EXTERN int NumProbs INIT(0);
EXTERN Prob levels[4][3]
=
{
{{1, 255}, {251, 0}, {4, 251}}, /* Top of tree almost always grey */
{{1, 255}, {200, 0}, {55, 200}},
{{33, 223}, {159, 0}, {64, 159}},
{{131, 0}, {0, 0}, {125, 131}} /* Grey disallowed at bottom */
}
;
EXTERN Prob freqs[16]
=
{
{0, 0}, {38, 0}, {38, 38}, {13, 152},
{38, 76}, {13, 165}, {13, 178}, {6, 230},
{38, 114}, {13, 191}, {13, 204}, {6, 236},
{13, 217}, {6, 242}, {5, 248}, {3, 253}
}
;
EXTERN int status;
EXTERN jmp_buf comp_env;
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