resampler.cpp File Reference

#include <stdlib.h>
#include <math.h>
#include <float.h>
#include <assert.h>
#include <string.h>
#include <iostream>
#include "resampler.h"

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Macros
#define	resampler_assert   assert
#define	max(a, b)   (((a) > (b)) ? (a) : (b))
#define	min(a, b)   (((a) < (b)) ? (a) : (b))
#define	TRUE   (1)
#define	FALSE   (0)
#define	RESAMPLER_DEBUG   0
#define	M_PI   3.14159265358979323846
#define	BOX_FILTER_SUPPORT   (0.5f)
#define	TENT_FILTER_SUPPORT   (1.0f)
#define	BELL_SUPPORT   (1.5f)
#define	B_SPLINE_SUPPORT   (2.0f)
#define	QUADRATIC_SUPPORT   1.5f
#define	MITCHELL_SUPPORT   (2.0f)
#define	CATMULL_ROM_SUPPORT   (2.0f)
#define	BLACKMAN_SUPPORT   (3.0f)
#define	GAUSSIAN_SUPPORT   (1.25f)
#define	LANCZOS3_SUPPORT   (3.0f)
#define	LANCZOS4_SUPPORT   (4.0f)
#define	LANCZOS6_SUPPORT   (6.0f)
#define	LANCZOS12_SUPPORT   (12.0f)
#define	KAISER_SUPPORT   3

Functions
static int	resampler_range_check (int v, int h)
static int	cast_to_int (Resample_Real i)
static int	posmod (int x, int y)
static Resample_Real	box_filter (Resample_Real t)
static Resample_Real	tent_filter (Resample_Real t)
static Resample_Real	bell_filter (Resample_Real t)
static Resample_Real	B_spline_filter (Resample_Real t)
static Resample_Real	quadratic (Resample_Real t, const Resample_Real R)
static Resample_Real	quadratic_interp_filter (Resample_Real t)
static Resample_Real	quadratic_approx_filter (Resample_Real t)
static Resample_Real	quadratic_mix_filter (Resample_Real t)
static Resample_Real	mitchell (Resample_Real t, const Resample_Real B, const Resample_Real C)
static Resample_Real	mitchell_filter (Resample_Real t)
static Resample_Real	catmull_rom_filter (Resample_Real t)
static double	sinc (double x)
static Resample_Real	clean (double t)
static double	blackman_exact_window (double x)
static Resample_Real	blackman_filter (Resample_Real t)
static Resample_Real	gaussian_filter (Resample_Real t)
static Resample_Real	lanczos3_filter (Resample_Real t)
static Resample_Real	lanczos4_filter (Resample_Real t)
static Resample_Real	lanczos6_filter (Resample_Real t)
static Resample_Real	lanczos12_filter (Resample_Real t)
static double	bessel0 (double x)
static double	kaiser (double alpha, double half_width, double x)
static Resample_Real	kaiser_filter (Resample_Real t)

Variables
static const Resample_Real	KAISER_ALPHA = 4.0
struct {
char   name [32]
Resample_Real(*   func )(Resample_Real t)
Resample_Real   support
}	g_filters []
static const int	NUM_FILTERS = sizeof(g_filters) / sizeof(g_filters[0])

Macro Definition Documentation

B_SPLINE_SUPPORT

#define B_SPLINE_SUPPORT   (2.0f)

Definition at line 115 of file resampler.cpp.

BELL_SUPPORT

#define BELL_SUPPORT   (1.5f)

Definition at line 97 of file resampler.cpp.

BLACKMAN_SUPPORT

#define BLACKMAN_SUPPORT   (3.0f)

Definition at line 248 of file resampler.cpp.

BOX_FILTER_SUPPORT

#define BOX_FILTER_SUPPORT   (0.5f)

Definition at line 75 of file resampler.cpp.

CATMULL_ROM_SUPPORT

#define CATMULL_ROM_SUPPORT   (2.0f)

Definition at line 214 of file resampler.cpp.

FALSE

#define FALSE   (0)

Definition at line 42 of file resampler.cpp.

GAUSSIAN_SUPPORT

#define GAUSSIAN_SUPPORT   (1.25f)

Definition at line 261 of file resampler.cpp.

KAISER_SUPPORT

#define KAISER_SUPPORT   3

Definition at line 350 of file resampler.cpp.

LANCZOS12_SUPPORT

#define LANCZOS12_SUPPORT   (12.0f)

Definition at line 309 of file resampler.cpp.

LANCZOS3_SUPPORT

#define LANCZOS3_SUPPORT   (3.0f)

Definition at line 273 of file resampler.cpp.

LANCZOS4_SUPPORT

#define LANCZOS4_SUPPORT   (4.0f)

Definition at line 285 of file resampler.cpp.

LANCZOS6_SUPPORT

#define LANCZOS6_SUPPORT   (6.0f)

Definition at line 297 of file resampler.cpp.

M_PI

#define M_PI   3.14159265358979323846

Definition at line 47 of file resampler.cpp.

max

#define max	(		a,
			b
	)		(((a) > (b)) ? (a) : (b))

Definition at line 30 of file resampler.cpp.

min

#define min	(		a,
			b
	)		(((a) < (b)) ? (a) : (b))

Definition at line 34 of file resampler.cpp.

MITCHELL_SUPPORT

#define MITCHELL_SUPPORT   (2.0f)

Definition at line 208 of file resampler.cpp.

QUADRATIC_SUPPORT

#define QUADRATIC_SUPPORT   1.5f

Definition at line 138 of file resampler.cpp.

resampler_assert

#define resampler_assert   assert

Definition at line 20 of file resampler.cpp.

RESAMPLER_DEBUG

#define RESAMPLER_DEBUG   0

Definition at line 45 of file resampler.cpp.

TENT_FILTER_SUPPORT

#define TENT_FILTER_SUPPORT   (1.0f)

Definition at line 85 of file resampler.cpp.

TRUE

#define TRUE   (1)

Definition at line 38 of file resampler.cpp.

Function Documentation

B_spline_filter()

static Resample_Real B_spline_filter ( Resample_Real  t )

static

Definition at line 116 of file resampler.cpp.

bell_filter()

static Resample_Real bell_filter ( Resample_Real  t )

static

Definition at line 98 of file resampler.cpp.

bessel0()

static double bessel0 ( double  x )

static

Definition at line 321 of file resampler.cpp.

Referenced by kaiser().

blackman_exact_window()

static double blackman_exact_window ( double  x )

static

Definition at line 243 of file resampler.cpp.

References M_PI.

Referenced by blackman_filter(), and gaussian_filter().

blackman_filter()

static Resample_Real blackman_filter ( Resample_Real  t )

static

Definition at line 249 of file resampler.cpp.

References blackman_exact_window(), clean(), and sinc().

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box_filter()

static Resample_Real box_filter ( Resample_Real  t )

static

Definition at line 76 of file resampler.cpp.

cast_to_int()

static int cast_to_int ( Resample_Real  i )

inlinestatic

Definition at line 50 of file resampler.cpp.

Referenced by Resampler::make_clist().

catmull_rom_filter()

static Resample_Real catmull_rom_filter ( Resample_Real  t )

static

Definition at line 215 of file resampler.cpp.

References mitchell().

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clean()

static Resample_Real clean ( double  t )

static

Definition at line 230 of file resampler.cpp.

Referenced by blackman_filter(), gaussian_filter(), kaiser_filter(), lanczos12_filter(), lanczos3_filter(), lanczos4_filter(), and lanczos6_filter().

gaussian_filter()

static Resample_Real gaussian_filter ( Resample_Real  t )

static

Definition at line 262 of file resampler.cpp.

References blackman_exact_window(), clean(), GAUSSIAN_SUPPORT, and M_PI.

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kaiser()

static double kaiser ( double  alpha, double  half_width, double  x  )

static

Definition at line 344 of file resampler.cpp.

References bessel0().

Referenced by kaiser_filter().

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kaiser_filter()

static Resample_Real kaiser_filter ( Resample_Real  t )

static

Definition at line 351 of file resampler.cpp.

References clean(), kaiser(), KAISER_SUPPORT, and sinc().

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lanczos12_filter()

static Resample_Real lanczos12_filter ( Resample_Real  t )

static

Definition at line 310 of file resampler.cpp.

References clean(), and sinc().

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lanczos3_filter()

static Resample_Real lanczos3_filter ( Resample_Real  t )

static

Definition at line 274 of file resampler.cpp.

References clean(), and sinc().

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lanczos4_filter()

static Resample_Real lanczos4_filter ( Resample_Real  t )

static

Definition at line 286 of file resampler.cpp.

References clean(), and sinc().

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lanczos6_filter()

static Resample_Real lanczos6_filter ( Resample_Real  t )

static

Definition at line 298 of file resampler.cpp.

References clean(), and sinc().

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mitchell()

static Resample_Real mitchell ( Resample_Real  t, const Resample_Real  B, const Resample_Real  C  )

static

Definition at line 178 of file resampler.cpp.

Referenced by catmull_rom_filter(), and mitchell_filter().

mitchell_filter()

static Resample_Real mitchell_filter ( Resample_Real  t )

static

Definition at line 209 of file resampler.cpp.

References mitchell().

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posmod()

static int posmod ( int  x, int  y  )

inlinestatic

Definition at line 56 of file resampler.cpp.

Referenced by Resampler::reflect().

quadratic()

static Resample_Real quadratic ( Resample_Real  t, const Resample_Real  R  )

static

Definition at line 139 of file resampler.cpp.

References QUADRATIC_SUPPORT.

Referenced by quadratic_approx_filter(), quadratic_interp_filter(), and quadratic_mix_filter().

quadratic_approx_filter()

static Resample_Real quadratic_approx_filter ( Resample_Real  t )

static

Definition at line 160 of file resampler.cpp.

References quadratic().

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quadratic_interp_filter()

static Resample_Real quadratic_interp_filter ( Resample_Real  t )

static

Definition at line 155 of file resampler.cpp.

References quadratic().

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quadratic_mix_filter()

static Resample_Real quadratic_mix_filter ( Resample_Real  t )

static

Definition at line 165 of file resampler.cpp.

References quadratic().

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resampler_range_check()

static int resampler_range_check ( int  v, int  h  )

inlinestatic

Definition at line 22 of file resampler.cpp.

References resampler_assert.

Referenced by Resampler::get_line(), Resampler::put_line(), Resampler::resample_y(), Resampler::Resampler(), and Resampler::restart().

sinc()

static double sinc ( double  x )

static

Definition at line 220 of file resampler.cpp.

References M_PI.

Referenced by blackman_filter(), kaiser_filter(), lanczos12_filter(), lanczos3_filter(), lanczos4_filter(), and lanczos6_filter().

tent_filter()

static Resample_Real tent_filter ( Resample_Real  t )

static

Definition at line 86 of file resampler.cpp.

Variable Documentation

func

Resample_Real(* func) (Resample_Real t)

(

Resample_Real

t

)

Definition at line 372 of file resampler.cpp.

Referenced by applyFunctionHeuristics(), mu::ParserBase::ContainsVectorVars(), Fitcontroller::fitctrl(), Resampler::Resampler(), and wxMGL::SetDraw().

struct { ... } g_filters[]

Initial value:

=
{
    {"box",                box_filter,                BOX_FILTER_SUPPORT },
    {"tent",               tent_filter,               TENT_FILTER_SUPPORT },
    {"bell",               bell_filter,               BELL_SUPPORT },
    {"bspline",            B_spline_filter,           B_SPLINE_SUPPORT },
    {"mitchell",           mitchell_filter,           MITCHELL_SUPPORT },
    {"lanczos3",           lanczos3_filter,           LANCZOS3_SUPPORT },
    {"blackman",           blackman_filter,           BLACKMAN_SUPPORT },
    {"lanczos4",           lanczos4_filter,           LANCZOS4_SUPPORT },
    {"lanczos6",           lanczos6_filter,           LANCZOS6_SUPPORT },
    {"lanczos12",          lanczos12_filter,          LANCZOS12_SUPPORT },
    {"kaiser",             kaiser_filter,             KAISER_SUPPORT },
    {"gaussian",           gaussian_filter,           GAUSSIAN_SUPPORT },
    {"catmullrom",         catmull_rom_filter,        CATMULL_ROM_SUPPORT },
    {"quadratic_interp",   quadratic_interp_filter,   QUADRATIC_SUPPORT },
    {"quadratic_approx",   quadratic_approx_filter,   QUADRATIC_SUPPORT },
    {"quadratic_mix",      quadratic_mix_filter,      QUADRATIC_SUPPORT },
}

Referenced by Resampler::get_filter_name(), and Resampler::Resampler().

KAISER_ALPHA

const Resample_Real KAISER_ALPHA = 4.0

static

Definition at line 343 of file resampler.cpp.

name

char name[32]

Definition at line 371 of file resampler.cpp.

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NUM_FILTERS

const int NUM_FILTERS = sizeof(g_filters) / sizeof(g_filters[0])

static

Definition at line 394 of file resampler.cpp.

Referenced by Resampler::get_filter_name(), Resampler::get_filter_num(), and Resampler::Resampler().

support

Resample_Real support

Definition at line 373 of file resampler.cpp.

Referenced by Resampler::Resampler().