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/* $Id: diffimg.c,v 1.11 2006/01/28 00:20:45 ellson Exp $ $Revision: 1.11 $ */
/* vim:set shiftwidth=4 ts=8: */
/**********************************************************
* This software is part of the graphviz package *
* http://www.graphviz.org/ *
* *
* Copyright (c) 1994-2004 AT&T Corp. *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Corp. *
* *
* Information and Software Systems Research *
* AT&T Research, Florham Park NJ *
**********************************************************/
/*
* This program generates an image where each pixel is the
* difference between the corresponding pixel in each of the
* two source images. Thus, if the source images are the same
* the resulting image will be black, otherwise it will have
* regions of non-black where the images differ.
*
* Currently supports: .png, .gif, .jpg, and .ps by using ghostscript
*
* John Ellson <ellson@research.att.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sysexits.h>
#include <gd.h>
#if defined HAVE_STDBOOL_H && ! defined __cplusplus
#include <stdbool.h>
#endif
#define NOT(v) (!(v))
#if ! defined HAVE_BOOL && ! defined __cplusplus
typedef unsigned char bool;
#define false 0
#define true NOT(false)
#endif
static char *pstopng="gs -dNOPAUSE -sDEVICE=pngalpha -sOutputFile=- -q -";
static gdImagePtr imageLoad (char *filename)
{
FILE *f;
char *ext, *cmd, *tmp;
gdImagePtr im;
int rc;
struct stat statbuf;
ext = strrchr(filename, '.');
if (!ext) {
fprintf(stderr, "Filename \"%s\" has no file extension.\n", filename);
exit(EX_USAGE);
}
rc = stat(filename, &statbuf);
if (rc) {
fprintf(stderr, "Failed to stat \"%s\"\n", filename);
exit(EX_NOINPUT);
}
if (strcasecmp(ext, ".ps") == 0) {
ext = ".png";
tmp = malloc(strlen(filename) + strlen(ext) + 1);
strcpy(tmp,filename);
strcat(tmp,ext);
cmd = malloc(strlen(pstopng) + 2 + strlen(filename) + 2 + strlen(tmp) + 1);
strcpy(cmd,pstopng);
strcat(cmd," <");
strcat(cmd,filename);
strcat(cmd," >");
strcat(cmd,tmp);
rc = system(cmd);
free(cmd);
f = fopen(tmp, "rb");
free(tmp);
if (!f) {
fprintf(stderr, "Failed to open converted \"%s%s\"\n", filename, ext);
exit(EX_NOINPUT);
}
}
else {
f = fopen(filename, "rb");
if (!f) {
fprintf(stderr, "Failed to open \"%s\"\n", filename);
exit(EX_NOINPUT);
}
}
im = 0;
if (strcasecmp(ext, ".png") == 0) {
#ifdef HAVE_GD_PNG
im = gdImageCreateFromPng(f);
#else
fprintf(stderr, "PNG support is not available\n");
exit(EX_UNAVAILABLE);
#endif
}
else if (strcasecmp(ext, ".gif") == 0) {
#ifdef HAVE_GD_GIF
im = gdImageCreateFromGif(f);
#else
fprintf(stderr, "GIF support is not available\n");
exit(EX_UNAVAILABLE);
#endif
}
else if (strcasecmp(ext, ".jpg") == 0) {
#ifdef HAVE_GD_JPEG
im = gdImageCreateFromJpeg(f);
#else
fprintf(stderr, "JPEG support is not available\n");
exit(EX_UNAVAILABLE);
#endif
}
fclose(f);
if (!im) {
fprintf(stderr, "Loading image from file \"%s\" failed!\n", filename);
exit(EX_DATAERR);
}
return im;
}
static bool imageDiff (gdImagePtr A, gdImagePtr B, gdImagePtr C,
unsigned int w, unsigned int h,
unsigned char black, unsigned char white)
{
unsigned int x, y;
bool d, rc;
rc = false;
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
d = (bool)( gdImageGetTrueColorPixel(B,x,y)
- gdImageGetTrueColorPixel(A,x,y));
gdImageSetPixel (C, x, y, (d ? white : black));
rc |= d;
}
}
return rc;
}
int main(int argc, char **argv)
{
gdImagePtr A, B, C;
unsigned char black, white;
unsigned int minSX, minSY, maxSX, maxSY;
bool rc;
#ifdef HAVE_GD_PNG
FILE *f;
#endif
if (argc < 3) {
fprintf(stderr, "Usage: diffimg image1 image2 [outimage]\n");
exit(EX_USAGE);
}
A = imageLoad(argv[1]);
B = imageLoad(argv[2]);
minSX = (gdImageSX(A) < gdImageSX(B)) ? gdImageSX(A) : gdImageSX(B);
minSY = (gdImageSY(A) < gdImageSY(B)) ? gdImageSY(A) : gdImageSY(B);
maxSX = (gdImageSX(A) > gdImageSX(B)) ? gdImageSX(A) : gdImageSX(B);
maxSY = (gdImageSY(A) > gdImageSY(B)) ? gdImageSY(A) : gdImageSY(B);
C = gdImageCreatePalette (maxSX, maxSY);
white = gdImageColorAllocate(C, gdRedMax, gdGreenMax, gdBlueMax);
black = gdImageColorAllocate(C, 0, 0, 0);
if (maxSX > minSX && maxSY > minSY)
gdImageFilledRectangle(C, minSX, minSY, maxSX-1, maxSY-1, black);
rc = imageDiff (A, B, C, minSX, minSY, black, white);
#ifdef HAVE_GD_PNG
if ((argc > 3) && ((f = fopen(argv[3], "wb")))) {
gdImagePng (C, f);
fclose(f);
}
else
gdImagePng (C, stdout);
#else
fprintf(stderr, "PNG output support is not available\n");
#endif
gdImageDestroy(A);
gdImageDestroy(B);
gdImageDestroy(C);
return (rc ? EXIT_FAILURE : EXIT_SUCCESS);
}
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