downsample.cpp File Reference

Small script for successively generating the downsampled images of the 8 large input-tiles (16K x 16K each). More...

#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <ctype.h>
#include <errno.h>
#include <math.h>
#include <limits.h>
#include <SDL/SDL.h>
#include <SDL/SDL_image.h>
#include "includes.hpp"
#include "pngout.hpp"
#include "rawio.hpp"
#include "sampler.hpp"
#include "dwt.hpp"
#include "tilecutter.hpp"

Functions
void	cleanup (int status, const char *fmt,...)
	Frees all allocated memory.
long int	str2int (char *string)
	Convert a string to an integer.
int	check_for_power_of_2 (SDL_Surface *img, int *ldw, int *ldh)
	Check if a certain image is "power of two - sized".
void	bmp_swap_BGR2RGB (SDL_Surface *img)
	Swap BGR => RGB.
int	main (int argc, char **argv)
	The main-function.
Variables
SDL_Surface *	img1
uchar_t *	src
uchar_t *	dst
uchar_t *	upsamp

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Detailed Description

Small script for successively generating the downsampled images of the 8 large input-tiles (16K x 16K each).

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Function Documentation

void bmp_swap_BGR2RGB

(

SDL_Surface *

img

)

Swap BGR => RGB.

Parameters:

img

The source-data for swapping.

int check_for_power_of_2	(	SDL_Surface *	img,
		int *	ldw,
		int *	ldh
	)

Check if a certain image is "power of two - sized".

Parameters:

	img	The input-image.
	ldw	The ld of the image-width.
	ldh	The ld of the image-height.

Returns:

Returns 0 if the image is power of two and -1 else.

void cleanup	(	int	status,
		const char *	fmt,
			...
	)

Frees all allocated memory.

Parameters:

	status	Exit-code for program termination.
	fmt	String to output before termination.

int main	(	int	argc,
		char **	argv
	)

The main-function.

Loads a picture and repeatedly downsamples the image by a factor of 2.

Parameters:

	argc	Argument count.
	argv	Argument strings.

Returns:

Returns 0 on success.

long int str2int

(

char *

string

)

Convert a string to an integer.

Parameters:

string

The string to be converted.

Returns:

The converted value or -1 if an error occurs (only positive values are valid anyway...).

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