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path: root/support/dktools/dk4pxres.c
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/*
Copyright (C) 2017-2020, Dirk Krause
SPDX-License-Identifier: BSD-3-Clause
*/

/*
	WARNING: This file was generated by the dkct program (see
	http://dktools.sourceforge.net/ for details).
	Changes you make here will be lost if dkct is run again!
	You should modify the original source and run dkct on it.
	Original source: dk4pxres.ctr
*/

/**	@file dk4pxres.c The dk4pxres module.
*/


#line 148 "dk4pxres.ctr"

#include "dk4conf.h"

#ifndef	DK4PXRES_H_INCLUDED
#include "dk4pxres.h"
#endif

#ifndef	DK4PXBIT_H_INCLUDED
#include "dk4pxbit.h"
#endif

#if DK4_HAVE_ASSERT_H
#ifndef	ASSERT_H_INCLUDED
#include <assert.h>
#define	ASSERT_H_INCLUDED 1
#endif
#endif




#line 168 "dk4pxres.ctr"



void
dk4pxres_init(dk4_px_resample_t *pxrptr)
{
	

#line 175 "dk4pxres.ctr"
#if	DK4_USE_ASSERT
	assert(NULL != pxrptr);
#endif
	if (NULL != pxrptr) {
		pxrptr->nom		= 255UL;
		pxrptr->denom	= 255UL;
		pxrptr->denom2	= 127UL;
	}
	

#line 184 "dk4pxres.ctr"
}



int
dk4pxres_setup(
	dk4_px_resample_t	*pxrptr,
	size_t				 ibits,
	size_t				 obits
)
{
	dk4_px_t	nom;
	dk4_px_t	denom;
	int		 	back	= 0;
	

#line 199 "dk4pxres.ctr"
#if	DK4_USE_ASSERT
	assert(NULL != pxrptr);
#endif
	/*
		Check pointer
	*/
	if (NULL == pxrptr) {
		goto finished;
	}
	pxrptr->nom = 255UL;
	pxrptr->denom = 255UL;
	pxrptr->denom2 = 127UL;
	/*
		Attempt to retrieve values
	*/
	nom		= dk4pxbit_get_max(obits);
	denom	= dk4pxbit_get_max(ibits);
	if ((0 == nom) || (0 == denom)) {
		goto finished;
	}
	/*
		Set values and indicate success
	*/
	pxrptr->nom		= (unsigned long)nom;
	pxrptr->denom	= (unsigned long)denom;
	pxrptr->denom2	= pxrptr->denom / 2UL;
	

#line 226 "dk4pxres.ctr"
	back = 1;
	finished:
	

#line 229 "dk4pxres.ctr"
	return back;
}



int
dk4pxres_setup_from_maxval(
	dk4_px_resample_t	*pxrptr,
	dk4_px_t			 imaxval,
	size_t				 obits
)
{
	int		 		back	= 0;
	unsigned long	nom;
	unsigned long	denom;
	

#line 245 "dk4pxres.ctr"
#if	DK4_USE_ASSERT
	assert(NULL != pxrptr);
#endif
	/*
		Check pointer
	*/
	if (NULL == pxrptr) {
		goto finished;
	}
	/*
		Set defaults
	*/
	pxrptr->nom = 255UL;
	pxrptr->denom = 255UL;
	pxrptr->denom2 = 127UL;
	/*
		Retrieve values
	*/
	nom = dk4pxbit_get_max(obits);
	if ((0 == nom) || (0 == imaxval)) {
		goto finished;
	}
	/*	Set values and indicate success
	*/
	pxrptr->nom		= (unsigned long)nom;
	pxrptr->denom	= denom	= (unsigned long)imaxval;
	pxrptr->denom2	= (unsigned long)imaxval / 2UL;
	

#line 273 "dk4pxres.ctr"
	back = 1;

	finished:
	

#line 277 "dk4pxres.ctr"
	return back;
}



int
dk4pxres_setup_to_maxval(
	dk4_px_resample_t	*pxrptr,
	size_t				 ibits,
	dk4_px_t			 omaxval
)
{
	unsigned long	nom;
	unsigned long	denom;
	int			 	back	= 0;
	

#line 293 "dk4pxres.ctr"
#if	DK4_USE_ASSERT
	assert(NULL != pxrptr);
#endif
	/*
		Check pointer
	*/
	if (NULL == pxrptr) { goto finished; }
	/*
		Set defaults
	*/
	pxrptr->nom = 255UL;
	pxrptr->denom = 255UL;
	pxrptr->denom2 = 127UL;
	/*
		Find nominator and denominator
	*/
	nom = (unsigned long)omaxval;
	denom = (unsigned long)dk4pxbit_get_max(ibits);
	if ((0UL == nom) || (0UL == denom)) { goto finished; }
	pxrptr->nom = nom;
	pxrptr->denom = denom;
	pxrptr->denom2 = denom / 2UL;
	

#line 316 "dk4pxres.ctr"
	back = 1;

	finished:
	

#line 320 "dk4pxres.ctr"
	return back;
}



dk4_px_t
dk4pxres_get(
	dk4_px_resample_t const	*pxrptr,
	dk4_px_t				 in
)
{
	unsigned long	prod;
	dk4_px_t		back	= 0U;
	

#line 334 "dk4pxres.ctr"
#if	DK4_USE_ASSERT
	assert(NULL != pxrptr);
#endif
	/*
		Check pointer
	*/
	if (NULL == pxrptr) {
		goto finished;
	}
	/*
		Leave value unchanged for equal size
	*/
	if (pxrptr->nom == pxrptr->denom) {
		back = in;
		goto finished;
	}
	/*
		Calculate
	*/
	if (0 == pxrptr->denom) {
		goto finished;
	}
	prod = (unsigned long)in * pxrptr->nom;
	back = (dk4_px_t)(prod / pxrptr->denom);
	if (pxrptr->denom2 < (prod % pxrptr->denom)) {
		back++;
	}
	finished:
	

#line 363 "dk4pxres.ctr"
	return back;
}



int
dk4pxres_check(
	dk4_px_resample_t const	*pxrptr,
	dk4_px_t				 in
)
{
	unsigned long	prod;
	int				back	= 0;
	

#line 377 "dk4pxres.ctr"
#if	DK4_USE_ASSERT
	assert(NULL != pxrptr);
#endif
	if (NULL == pxrptr) {
		goto finished;
	}
	if (pxrptr->nom == pxrptr->denom) {
		back = 1;
		goto finished;
	}
	if (0 == pxrptr->denom) {
		goto finished;
	}
	prod = (unsigned long)in * pxrptr->nom;
	if (0 == (prod % pxrptr->denom)) {
		back = 1;
	}
	finished:
	

#line 396 "dk4pxres.ctr"
	return back;
}



int
dk4pxres_multiple(
	dk4_px_t				*dptr,
	size_t					 dsz,
	dk4_px_resample_t const	*pxrptr
)
{
	int		 back	= 0;
	

#line 410 "dk4pxres.ctr"
#if	DK4_USE_ASSERT
	assert(NULL != dptr);
	assert(0 < dsz);
#endif
	if ((NULL == dptr) || (NULL == pxrptr)) {
		goto finished;
	}
	back = 1;
	while (0 < dsz--) {
		*dptr = dk4pxres_get(pxrptr, *dptr);
		dptr++;
	}
	finished:
	

#line 424 "dk4pxres.ctr"
	return back;
}



/* vim: set ai sw=4 ts=4 : */