From 48ffee5fa78f44bd00d76772ad79ae4eeb6c8dc4 Mon Sep 17 00:00:00 2001
From: Alexey Andreyev <aa13q@ya.ru>
Date: Wed, 15 May 2019 16:36:02 +0300
Subject: Move out the logic of the hue calculation to utils

---
 lib/util.cpp | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'lib/util.cpp')

diff --git a/lib/util.cpp b/lib/util.cpp
index 4e17d2f9..01d4e77b 100644
--- a/lib/util.cpp
+++ b/lib/util.cpp
@@ -23,6 +23,10 @@
 #include <QtCore/QDir>
 #include <QtCore/QStringBuilder>
 
+#include <QtCore/QCryptographicHash>
+#include <QtCore/QtEndian>
+#include <QtCore/QDataStream>
+
 static const auto RegExpOptions =
     QRegularExpression::CaseInsensitiveOption
     | QRegularExpression::OptimizeOnFirstUsageOption
@@ -93,6 +97,21 @@ QString QMatrixClient::cacheLocation(const QString& dirName)
     return cachePath;
 }
 
+qreal QMatrixClient::stringToHueF(const QString &string)
+{
+    Q_ASSERT(!string.isEmpty());
+    QByteArray hash = QCryptographicHash::hash(string.toUtf8(),
+                                               QCryptographicHash::Sha1);
+    QDataStream dataStream(qToLittleEndian(hash).left(2));
+    dataStream.setByteOrder(QDataStream::LittleEndian);
+    quint16 hashValue;
+    dataStream >> hashValue;
+    const auto hueF =
+            qreal(hashValue)/std::numeric_limits<quint16>::max();
+    Q_ASSERT((0 <= hueF) && (hueF <= 1));
+    return hueF;
+}
+
 // Tests for function_traits<>
 
 #ifdef Q_CC_CLANG
-- 
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