From 66953954df20c49d1fb5246c29b514ed77d97ee8 Mon Sep 17 00:00:00 2001
From: ellson <devnull@localhost>
Date: Tue, 18 Oct 2005 18:53:33 +0000
Subject: [PATCH] add .ps to diffimg by using system(gs ...) for the conversion

---
 contrib/diffimg/diffimg.c | 93 +++++++++++++++++++++++++++------------
 1 file changed, 64 insertions(+), 29 deletions(-)

diff --git a/contrib/diffimg/diffimg.c b/contrib/diffimg/diffimg.c
index a5eca9472..bda190e75 100644
--- a/contrib/diffimg/diffimg.c
+++ b/contrib/diffimg/diffimg.c
@@ -29,50 +29,61 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
 #include <gd.h>
 
 #define ABS(x) (((x) < 0) ? -(x) : (x))
 
-static void imageDiff (gdImagePtr dst, gdImagePtr src,
-			int dstX, int dstY,
-			int srcX, int srcY,
-			int w, int h)
-{
-    int s, d;
-    int x, y;
-
-    for (y = 0; (y < h); y++) {
-        for (x = 0; (x < w); x++) {
-	    s = gdImageGetTrueColorPixel (src, srcX + x, srcY + y);
-	    d = gdImageGetTrueColorPixel (dst, dstX + x, dstY + y);
-    
-	    d = gdTrueColorAlpha(
-		  ABS(gdTrueColorGetRed(s) - gdTrueColorGetRed(d)),
-		  ABS(gdTrueColorGetGreen(s) - gdTrueColorGetGreen(d)),
-		  ABS(gdTrueColorGetBlue(s) - gdTrueColorGetBlue(d)),
-		  ABS(gdTrueColorGetAlpha(s) - gdTrueColorGetAlpha(d)));
-    
-            gdImageSetPixel (dst, dstX + x, dstY + y, d);
-        }
-    }
-}
+static char *pstopng="gs -dNOPAUSE -sDEVICE=pngalpha -sOutputFile=- -q -";
 
 static gdImagePtr imageLoad (char *filename)
 {
     FILE *f;
-    char *ext;
+    char *ext, *cmd, *tmp, *base;
     gdImagePtr im;
+    int rc;
+    struct stat statbuf;
 
-    f = fopen(filename, "rb");
-    if (!f) {
-        fprintf(stderr, "Input file \"%s\" does not exist!\n", filename);
-        exit(1);
-    }
     ext = strrchr(filename, '.');
     if (!ext) {
         fprintf(stderr, "Filename \"%s\" has no file extension.\n", filename);
         exit(1);
     }
+    rc = stat(filename, &statbuf);
+    if (rc) {
+	 fprintf(stderr, "Failed to stat \"%s\"\n", filename);
+         exit(1);
+    }
+    if (strcasecmp(ext, ".ps") == 0) {
+	ext = ".png";
+	base = strrchr(filename, '/');
+	if (base != filename)
+	    base++;
+	tmp = malloc(strlen(base) + 20 + strlen(ext));
+	strcpy(tmp,"/tmp/diffimg-");
+	strcat(tmp,base);
+	strcat(tmp,ext);
+	
+	cmd = malloc(strlen(pstopng) + strlen(filename) + strlen(tmp) + 10);
+	strcpy(cmd,pstopng);
+	strcat(cmd," <");
+	strcat(cmd,filename);
+	strcat(cmd," >");
+	strcat(cmd,tmp);
+	rc = system(cmd);
+	
+        f = fopen(tmp, "rb");
+	free(cmd);
+	free(tmp);
+    }
+    else
+        f = fopen(filename, "rb");
+    if (!f) {
+        fprintf(stderr, "Failed to open \"%s\"\n", filename);
+        exit(1);
+    }
     im = 0;
     if (strcasecmp(ext, ".png") == 0) 
         im = gdImageCreateFromPng(f);
@@ -88,6 +99,30 @@ static gdImagePtr imageLoad (char *filename)
     return im;
 }
 
+static void imageDiff (gdImagePtr dst, gdImagePtr src,
+			int dstX, int dstY,
+			int srcX, int srcY,
+			int w, int h)
+{
+    int s, d;
+    int x, y;
+
+    for (y = 0; (y < h); y++) {
+        for (x = 0; (x < w); x++) {
+	    s = gdImageGetTrueColorPixel (src, srcX + x, srcY + y);
+	    d = gdImageGetTrueColorPixel (dst, dstX + x, dstY + y);
+    
+	    d = gdTrueColorAlpha(
+		  ABS(gdTrueColorGetRed(s) - gdTrueColorGetRed(d)),
+		  ABS(gdTrueColorGetGreen(s) - gdTrueColorGetGreen(d)),
+		  ABS(gdTrueColorGetBlue(s) - gdTrueColorGetBlue(d)),
+		  ABS(gdTrueColorGetAlpha(s) - gdTrueColorGetAlpha(d)));
+    
+            gdImageSetPixel (dst, dstX + x, dstY + y, d);
+        }
+    }
+}
+
 int main(int argc, char **argv)
 {
     gdImagePtr im1, im2, im3;
-- 
2.40.0