curve_tools.c File Reference

#include "common/darktable.h"
#include "curve_tools.h"
#include <float.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>

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Macros
#define	EPSILON   2 * FLT_MIN
#define	MAX_ITER   10

Functions
float	spline_cubic_val (int n, float t[], float tval, float y[], float ypp[])
float	catmull_rom_val (int n, float x[], float xval, float y[], float tangents[])
float *	spline_cubic_set (int n, float t[], float y[])
float *	catmull_rom_set (int n, float x[], float y[])
float *	monotone_hermite_set (int n, float x[], float y[])
float *	d3_np_fs (int n, float a[], float b[])
static float *	spline_cubic_set_internal (int n, float t[], float y[], int ibcbeg, float ybcbeg, int ibcend, float ybcend)
float *	interpolate_set (int n, float x[], float y[], unsigned int type)
float	interpolate_val (int n, float x[], float xval, float y[], float tangents[], unsigned int type)
int	CurveDataSample (CurveData *curve, CurveSample *sample)

Variables
static const int	curvedata_anchors_max = 20
float(*	spline_val [])(int, float[], float, float[], float[]) = { spline_cubic_val, catmull_rom_val, catmull_rom_val }
float *(*	spline_set [])(int, float[], float[]) = { spline_cubic_set, catmull_rom_set, monotone_hermite_set }

Macro Definition Documentation

EPSILON

#define EPSILON   2 * FLT_MIN

MAX_ITER

#define MAX_ITER   10

Function Documentation

catmull_rom_set()

float * catmull_rom_set	(	int	n,
		float	x[],
		float	y[]
	)

References i, m, n, and x.

catmull_rom_val()

float catmull_rom_val	(	int	n,
		float	x[],
		float	xval,
		float	y[],
		float	tangents[]
	)

References h, i, n, and x.

CurveDataSample()

int CurveDataSample	(	CurveData *	curve,
		CurveSample *	sample
	)

References CT_ERROR, CT_SUCCESS, dt_free, i, interpolate_set(), interpolate_val(), CurveData::m_anchors, CurveData::m_max_x, CurveData::m_max_y, CurveData::m_min_x, CurveData::m_min_y, CurveData::m_numAnchors, CurveSample::m_outputRes, CurveSample::m_Samples, CurveSample::m_samplingRes, CurveData::m_spline_type, n, CurveAnchorPoint::x, x, and CurveAnchorPoint::y.

Referenced by dt_draw_curve_calc_values(), get_error(), and main().

d3_np_fs()

float * d3_np_fs	(	int	n,
		float	a[],
		float	b[]
	)

References a, b, curvedata_anchors_max, i, n, and x.

Referenced by spline_cubic_set_internal().

interpolate_set()

float * interpolate_set	(	int	n,
		float	x[],
		float	y[],
		unsigned int	type
	)

References n, spline_set, type, and x.

Referenced by CurveDataSample(), and dt_draw_curve_calc_value().

interpolate_val()

float interpolate_val	(	int	n,
		float	x[],
		float	xval,
		float	y[],
		float	tangents[],
		unsigned int	type
	)

References n, spline_val, type, and x.

Referenced by CurveDataSample(), and dt_draw_curve_calc_value().

monotone_hermite_set()

float * monotone_hermite_set	(	int	n,
		float	x[],
		float	y[]
	)

References delta, dt_free, EPSILON, i, m, n, and x.

spline_cubic_set()

float * spline_cubic_set	(	int	n,
		float	t[],
		float	y[]
	)

References n, spline_cubic_set_internal(), and t.

spline_cubic_set_internal()

static float * spline_cubic_set_internal ( int  n, float  t[], float  y[], int  ibcbeg, float  ybcbeg, int  ibcend, float  ybcend  )

static

References a, b, d3_np_fs(), dt_free, i, n, and t.

Referenced by spline_cubic_set().

spline_cubic_val()

float spline_cubic_val	(	int	n,
		float	t[],
		float	tval,
		float	y[],
		float	ypp[]
	)

ypval = ( y[ival+1] - y[ival] ) / h

• ( ypp[ival+1] / 6.0E+00 + ypp[ival] / 3.0E+00 ) * h
• dt * ( ypp[ival]
• dt * ( 0.5E+00 * ( ypp[ival+1] - ypp[ival] ) / h ) );

yppval = ypp[ival] + dt * ( ypp[ival+1] - ypp[ival] ) / h;

References h, i, n, and t.

Variable Documentation

curvedata_anchors_max

const int curvedata_anchors_max = 20

static

Referenced by d3_np_fs().

spline_set

float *(* spline_set[])(int, float[], float[])	(	int	,
		float	[],
		float	[]
	)		= { spline_cubic_set, catmull_rom_set, monotone_hermite_set }

Referenced by interpolate_set().

spline_val

float(* spline_val[])(int, float[], float, float[], float[])	(	int	,
		float	[],
		float	,
		float	[],
		float	[]
	)		= { spline_cubic_val, catmull_rom_val, catmull_rom_val }

Referenced by interpolate_val().