--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/lcms2/utils/samples/roundtrip.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,99 @@
+//
+//  Little cms
+//  Copyright (C) 1998-2011 Marti Maria
+//
+// Permission is hereby granted, free of charge, to any person obtaining 
+// a copy of this software and associated documentation files (the "Software"), 
+// to deal in the Software without restriction, including without limitation 
+// the rights to use, copy, modify, merge, publish, distribute, sublicense, 
+// and/or sell copies of the Software, and to permit persons to whom the Software 
+// is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in 
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO 
+// THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 
+
+#include "lcms2mt.h"
+#include <math.h>
+
+
+
+static
+double VecDist(cmsUInt8Number bin[3], cmsUInt8Number bout[3])
+{
+       double rdist, gdist, bdist;
+
+       rdist = fabs((double) bout[0] - bin[0]);
+       gdist = fabs((double) bout[1] - bin[1]);
+       bdist = fabs((double) bout[2] - bin[2]);
+
+       return (sqrt((rdist*rdist + gdist*gdist + bdist*bdist)));
+}
+
+
+int main(int  argc, char* argv[])
+{
+
+    int r, g, b;
+    cmsUInt8Number RGB[3], RGB_OUT[3];
+    cmsHTRANSFORM xform;
+    cmsHPROFILE hProfile;
+    double err, SumX=0, SumX2=0, Peak = 0, n = 0;
+
+
+    if (argc != 2) {
+        printf("roundtrip <RGB icc profile>\n");
+        return 1;
+    }
+
+    hProfile = cmsOpenProfileFromFile(argv[1], "r");
+    if (hProfile == NULL)
+    {
+        printf("invalid profile\n");
+        return 1;
+    }
+
+    xform = cmsCreateTransform(hProfile,TYPE_RGB_8, hProfile, TYPE_RGB_8, INTENT_RELATIVE_COLORIMETRIC, cmsFLAGS_NOOPTIMIZE);
+    if (xform == NULL)
+    {
+        printf("Not a valid RGB profile\n");
+        return 1;
+    }
+
+    for (r=0; r< 256; r++) {
+        printf("%d  \r", r);
+        for (g=0; g < 256; g++) {
+            for (b=0; b < 256; b++) {
+
+                RGB[0] = r;
+                RGB[1] = g;
+                RGB[2] = b;
+
+                cmsDoTransform(xform, RGB, RGB_OUT, 1);
+
+                err = VecDist(RGB, RGB_OUT);
+
+                SumX  += err;
+                SumX2 += err * err;
+                n += 1.0;
+                if (err > Peak)
+                    Peak = err;
+
+            }
+        }
+    }
+
+    printf("Average %g\n", SumX / n);
+    printf("Max %g\n", Peak);
+    printf("Std  %g\n", sqrt((n*SumX2 - SumX * SumX) / (n*(n-1))));
+    cmsCloseProfile(hProfile);
+    cmsDeleteTransform(xform);
+
+    return 0;
+}
\ No newline at end of file