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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <pthread.h>
#include <wand/magick_wand.h>

static pthread_mutex_t mutex_im = PTHREAD_MUTEX_INITIALIZER;

int resizeimage(void)
{
        int ret=0; 
        float factor = 0.5;
        int height, width;
        MagickBooleanType
        status;
        MagickWand
        *magick_wand;

        pthread_mutex_lock(&mutex_im);

        MagickWandGenesis();
        magick_wand = NewMagickWand();
        status = MagickReadImage(magick_wand, "image.jpg");

        if (status == MagickFalse)
        {   
                ret = -1; 
                printf("Impossible de lire image.jpg\n");
                goto end;
        }   

        width = MagickGetImageWidth(magick_wand) * factor;
        height = MagickGetImageHeight(magick_wand) * factor;
        MagickResizeImage(magick_wand, width, height, LanczosFilter, 1.0);
        status = MagickWriteImages(magick_wand, "image2.jpg", 0); 

        if (status == MagickFalse)
        {   
                ret = -1; 
                printf("Impossible d'ecrire image2.gif\n");
                goto end;
        }   

end:
        magick_wand = DestroyMagickWand(magick_wand);
        MagickWandTerminus();
        pthread_mutex_unlock(&mutex_im);
        return ret;
}

int main(void)
{
        resizeimage();
        return 0;
}