I have made a simple function to resize a jpeg image :
Code: Select all
#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;
}- valgrind --leak-check=full test_resizeimage
==8701== Memcheck, a memory error detector
==8701== Copyright (C) 2002-2010, and GNU GPL'd, by Julian Seward et al.
==8701== Using Valgrind-3.6.1 and LibVEX; rerun with -h for copyright info
==8701== Command: test_resizeimage
==8701==
==8701==
==8701== HEAP SUMMARY:
==8701== in use at exit: 49,376 bytes in 1,329 blocks
==8701== total heap usage: 1,654 allocs, 325 frees, 728,485 bytes allocated
==8701==
==8701== 117 (84 direct, 33 indirect) bytes in 1 blocks are definitely lost in loss record 1,105 of 1,112
==8701== at 0x4023BE8: malloc (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
==8701== by 0x4211405: AcquireMagickMemory (in /usr/lib/libMagickCore.so.4.0.1)
==8701== by 0x420FC5C: SetMagickInfo (in /usr/lib/libMagickCore.so.4.0.1)
==8701== by 0x42DA553: RegisterMAGICKImage (in /usr/lib/libMagickCore.so.4.0.1)
==8701== by 0x427F86E: RegisterStaticModules (in /usr/lib/libMagickCore.so.4.0.1)
==8701== by 0x420FFE0: GetMagickInfo (in /usr/lib/libMagickCore.so.4.0.1)
==8701== by 0x4200F62: SetImageInfo (in /usr/lib/libMagickCore.so.4.0.1)
==8701== by 0x4187D80: ReadImage (in /usr/lib/libMagickCore.so.4.0.1)
==8701== by 0x40AB6D2: MagickReadImage (in /usr/lib/libMagickWand.so.4.0.1)
==8701== by 0x8048818: resizeimage (resizeimage.c:24)
==8701== by 0x468BDA5: (below main) (in /lib/libc-2.13.so)
==8701==
==8701== LEAK SUMMARY:
==8701== definitely lost: 84 bytes in 1 blocks
==8701== indirectly lost: 33 bytes in 3 blocks
==8701== possibly lost: 0 bytes in 0 blocks
==8701== still reachable: 49,259 bytes in 1,325 blocks
==8701== suppressed: 0 bytes in 0 blocks
==8701== Reachable blocks (those to which a pointer was found) are not shown.
==8701== To see them, rerun with: --leak-check=full --show-reachable=yes
==8701==
==8701== For counts of detected and suppressed errors, rerun with: -v
==8701== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 43 from
Thomas