#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include <assert.h>
#include <simage.h>

Data Structures
struct	Image

struct	CONTRIB

struct	CLIST

Macros
#define	M_PI 3.14159265358979323846

#define	filter_support (1.0f)

#define	box_support (0.5f)

#define	triangle_support (1.0f)

#define	bell_support (1.5f)

#define	B_spline_support (2.0f)

#define	Lanczos3_support (3.0f)

#define	Mitchell_support (2.0)

#define	B (1.0f / 3.0f)

#define	C (1.0f / 3.0f)

Functions
static void	get_row (unsigned char row, Image image, int y)

static void	get_column (unsigned char column, Image image, int x)

static void	put_pixel (Image image, int x, int y, float data)

static float	filter (float t)

static float	box_filter (float t)

static float	triangle_filter (float t)

static float	bell_filter (float t)

static float	B_spline_filter (float t)

static float	sinc (float x)

static float	Lanczos3_filter (float t)

static float	Mitchell_filter (float t)

static Image *	new_image (int xsize, int ysize, int bpp, unsigned char *data)

static void	zoom (Image dst, Image src, float(*filterf)(float), float fwidth)

static unsigned char *	simage_resize_fast (unsigned char *src, int width, int height, int num_comp, int newwidth, int newheight)

unsigned char *	simage_resize (unsigned char *src, int width, int height, int num_comp, int newwidth, int newheight)

Macro Definition Documentation

#define B (1.0f / 3.0f)

Definition at line 193 of file resize.c.

Referenced by Mitchell_filter().

#define B_spline_support (2.0f)

Definition at line 155 of file resize.c.

#define bell_support (1.5f)

Definition at line 141 of file resize.c.

Referenced by simage_resize().

#define box_support (0.5f)

Definition at line 122 of file resize.c.

#define C (1.0f / 3.0f)

Definition at line 194 of file resize.c.

Referenced by Mitchell_filter().

#define filter_support (1.0f)

Definition at line 111 of file resize.c.

#define Lanczos3_support (3.0f)

Definition at line 181 of file resize.c.

#define M_PI 3.14159265358979323846

Definition at line 43 of file resize.c.

Referenced by sinc().

#define Mitchell_support (2.0)

Definition at line 191 of file resize.c.

#define triangle_support (1.0f)

Definition at line 131 of file resize.c.

Function Documentation

static float B_spline_filter ( float t )

static

Definition at line 158 of file resize.c.

static float bell_filter ( float t )

static

Definition at line 144 of file resize.c.

Referenced by simage_resize().

static float box_filter ( float t )

static

Definition at line 125 of file resize.c.

static float filter ( float t )

static

Definition at line 114 of file resize.c.

static void get_column	(	unsigned char *	column,
		Image *	image,
		int	x
	)

static

Definition at line 66 of file resize.c.

References Image::bpp, Image::data, Image::span, and Image::ysize.

Referenced by zoom().

static void get_row	(	unsigned char *	row,
		Image *	image,
		int	y
	)

static

Definition at line 55 of file resize.c.

References Image::bpp, Image::data, Image::span, and Image::xsize.

Referenced by zoom().

static float Lanczos3_filter ( float t )

static

Definition at line 184 of file resize.c.

References sinc().

static float Mitchell_filter ( float t )

static

Definition at line 197 of file resize.c.

References B, and C.

static Image* new_image	(	int	xsize,
		int	ysize,
		int	bpp,
		unsigned char *	data
	)

static

Definition at line 234 of file resize.c.

References Image::bpp, Image::data, Image::span, Image::xsize, and Image::ysize.

Referenced by simage_resize(), and zoom().

static void put_pixel	(	Image *	image,
		int	x,
		int	y,
		float *	data
	)

static

Definition at line 85 of file resize.c.

References Image::bpp, Image::data, and Image::span.

Referenced by zoom().

unsigned char* simage_resize	(	unsigned char *	imagedata,
		int	width,
		int	height,
		int	numcomponents,
		int	newwidth,
		int	newheight
	)

Since OpenGL textures must have width and height equal to 2^n, this is often needed. A pointer to the new image data is returned. imagedata is not freed. Uses the algorithm "Filtered Image Rescaling" by Dale Schumacher, from GGems III.

Scales the input imagedata and return a new image with the given dimensions returned image buffer must be freed by simage_free_image()

Definition at line 512 of file resize.c.

References bell_filter(), bell_support, Image::data, new_image(), simage_resize_fast(), and zoom().