added dependencies and build files (loosely inspired by Sebastian Dorda's love-native-android)

jni/lcms2-2.2/utils/samples/roundtrip.c

@@ -0,0 +1,66 @@
+
+#include "lcms2.h"
+
+
+static
+double VecDist(BYTE bin[3], BYTE bout[3])
+{
+       double rdist, gdist, bdist;
+
+       rdist = fabs(bout[0] - bin[0]);
+       gdist = fabs(bout[1] - bin[1]);
+       bdist = fabs(bout[2] - bin[2]);
+
+       return (sqrt((rdist*rdist + gdist*gdist + bdist*bdist)));
+}
+
+
+int main(int  argc, char* argv[])
+{
+
+	int r, g, b;
+	BYTE RGB[3], RGB_OUT[3];
+	cmsHTRANSFORM xform;
+	cmsHPROFILE hProfile;
+	double err, SumX=0, SumX2=0, Peak = 0, n = 0;
+
+
+	if (argc != 2) {
+		printf("roundtrip <icc profile>\n");
+		return 1;
+	}
+
+	hProfile = cmsOpenProfileFromFile(argv[1], "r");
+	xform = cmsCreateTransform(hProfile,TYPE_RGB_8, hProfile, TYPE_RGB_8, INTENT_RELATIVE_COLORIMETRIC, cmsFLAGS_NOTPRECALC);
+
+	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;
+}