libpipi/test/u8tof32tou8.c

/*
 *  libpipi       Pathetic image processing interface library
 *  Copyright (c) 2004-2008 Sam Hocevar <sam@zoy.org>
 *                All Rights Reserved
 *
 *  $Id$
 *
 *  This library is free software. It comes without any warranty, to
 *  the extent permitted by applicable law. You can redistribute it
 *  and/or modify it under the terms of the Do What The Fuck You Want
 *  To Public License, Version 2, as published by Sam Hocevar. See
 *  http://sam.zoy.org/wtfpl/COPYING for more details.
 */

/*
 * loadsave.c: unit test to check that converting an image to float values
 * and back to 8-bit integers does not change it.
 */

#include "config.h"

#include <stdio.h>
#include <stdlib.h>

#include <pipi.h>

int main(int argc, char *argv[])
{
    pipi_image_t *img1, *img2;
    pipi_pixels_t *pix1, *pix2;
    uint32_t *data1, *data2;
    int x, y, ret = EXIT_SUCCESS;

    img1 = pipi_load("mona.png");
    img2 = pipi_load("mona.png");

    pix1 = pipi_get_pixels(img1, PIPI_PIXELS_RGBA_U8);
    data1 = (uint32_t *)pix1->pixels;

    pipi_get_pixels(img2, PIPI_PIXELS_RGBA_F32);
    pix2 = pipi_get_pixels(img2, PIPI_PIXELS_RGBA_U8);
    data2 = (uint32_t *)pix2->pixels;

    for(y = 0; y < pix1->h; y++)
    {
        for(x = 0; x < pix1->w; x++)
        {
            uint32_t a = data1[y * pix1->w + x];
            uint32_t b = data2[y * pix2->w + x];

            if(a != b)
            {
                printf("loadsave: %08x != %08x at (%i,%i)\n", a, b, x, y);
                ret = EXIT_FAILURE;
            }
        }
    }

    pipi_free(img1);
    pipi_free(img2);

    return ret;
}