resize.c File Reference

#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

M_PI

#define M_PI   3.14159265358979323846

filter_support

#define filter_support   (1.0f)

box_support

#define box_support   (0.5f)

triangle_support

#define triangle_support   (1.0f)

bell_support

#define bell_support   (1.5f)

B_spline_support

#define B_spline_support   (2.0f)

Lanczos3_support

#define Lanczos3_support   (3.0f)

Mitchell_support

#define Mitchell_support   (2.0)

B

#define B   (1.0f / 3.0f)

C

#define C   (1.0f / 3.0f)

Function Documentation

get_row()

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

static

get_column()

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

static

put_pixel()

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

static

filter()

static float filter ( float  t )

static

box_filter()

static float box_filter ( float  t )

static

triangle_filter()

static float triangle_filter ( float  t )

static

bell_filter()

static float bell_filter ( float  t )

static

B_spline_filter()

static float B_spline_filter ( float  t )

static

sinc()

static float sinc ( float  x )

static

Lanczos3_filter()

static float Lanczos3_filter ( float  t )

static

Mitchell_filter()

static float Mitchell_filter ( float  t )

static

new_image()

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

static

zoom()

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

static

simage_resize_fast()

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

static

simage_resize()

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()