package eu.siacs.conversations.utils; import android.graphics.Color; import org.hsluv.HUSLColorConverter; import java.nio.charset.StandardCharsets; import java.security.MessageDigest; class XEP0392Helper { private static double angle(String nickname) { try { MessageDigest sha1 = MessageDigest.getInstance("SHA-1"); byte[] digest = sha1.digest(nickname.getBytes(StandardCharsets.UTF_8)); int angle = ((int) (digest[0]) & 0xff) + ((int) (digest[1]) & 0xff) * 256; return angle / 65536.; } catch (Exception e) { return 0.0; } } static int rgbFromNick(String name) { double[] hsluv = new double[3]; hsluv[0] = angle(name) * 360; hsluv[1] = 100; hsluv[2] = 50; double[] rgb = HUSLColorConverter.hsluvToRgb(hsluv); return Color.rgb((int) Math.round(rgb[0] * 255), (int) Math.round(rgb[1] * 255), (int) Math.round(rgb[2] * 255)); } }