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dither.h
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1992-07-05
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/*
* NAME dither.h - header file for Floyd-Steinberg dithering
*
* DESCRIPTION See header for dither.c.
*/
/* TYPEDEFS */
typedef struct
{
BYTE minIn; /* minimum input value */
BYTE maxIn; /* maximum input value */
BYTE minOut; /* minimum output value */
BYTE maxOut; /* maximum output value */
int numCols; /* number of columns per row */
ulong scale; /* scale factor for thresholding inflated by
* InflateBase */
ulong invscale; /* inverse scale factor */
int *oddRowErrs; /* array holding odd row errors */
int *evenRowErrs; /* array holding even row errors */
} DCtrlType;
/* FUNCTION PROTOTYPES */
int
DitherInit (
BYTE minIn, /* minimum input value */
BYTE maxIn, /* maximum input value */
BYTE minOut, /* minimum output value */
BYTE maxOut, /* maximum output value */
int numCols, /* number of columns in each row */
DCtrlType * pCtrl /* structure with control parameters */
);
void Dither (
DCtrlType * pCtrl, /* structure with
* control parameters */
int *pIn, /* input values */
int *pOut, /* output values */
int OddRow /* TRUE => current row
* is odd-numbered */
);
void DitherTerm (
DCtrlType * pCtrl /* structure with
* control parameters */
);