Use a C++ implementation of hsluv

src/backend/backend.py

@@ -7,7 +7,6 @@ import traceback
 from pathlib import Path
 from typing import Any, DefaultDict, Dict, List, Optional, Tuple
 
-import hsluv
 from appdirs import AppDirs
 
 import nio
@@ -245,13 +244,6 @@ class Backend:
 
     # General functions
 
-    @staticmethod
-    def hsluv(hue: int, saturation: int, lightness: int) -> List[float]:
-        """Convert HSLuv (0-360, 0-100, 0-100) to RGB (0-1, 0-1, 0-1) color."""
-
-        return hsluv.hsluv_to_rgb([hue, saturation, lightness])
-
-
     async def load_settings(self) -> tuple:
         """Return parsed user config files."""
 

src/gui/Utils.qml

@@ -91,9 +91,7 @@ QtObject {
 
 
     function hsluv(hue, saturation, lightness, alpha=1.0) {
-        hue = numberWrapAt(hue, 360)
-        let rgb = py.callSync("hsluv", [hue, saturation, lightness])
-        return Qt.rgba(rgb[0], rgb[1], rgb[2], alpha)
+        return CppUtils.hsluv(hue, saturation, lightness, alpha)
     }
 
 

src/utils.cpp

@@ -2,10 +2,12 @@
 
 // Function implementations of the Utils class, see the utils.h file.
 
+#include <QColor>
 #include <QLocale>
 #include <QUuid>
 
 #include "utils.h"
+#include "../submodules/hsluv-c/src/hsluv.h"
 
 
 Utils::Utils() {
@@ -23,3 +25,10 @@ QString Utils::formattedBytes(qint64 bytes, int precision) {
 QString Utils::uuid() {
     return QUuid::createUuid().toString(QUuid::WithoutBraces);
 }
+
+
+QColor Utils::hsluv(qreal hue, qreal saturation, qreal luv, qreal alpha) {
+    double red, green, blue;
+    hsluv2rgb(hue, saturation, luv, &red, &green, &blue);
+    return QColor::fromRgbF(red, green, blue, alpha);
+}

src/utils.h

@@ -1,13 +1,14 @@
 // SPDX-License-Identifier: LGPL-3.0-or-later
 
 // The Utils class exposes various useful functions for QML that aren't
-// normally provided by Qt.
+// provided by the `Qt` object.
 
 #ifndef UTILS_H
 #define UTILS_H
 
-#include <QObject>
+#include <QColor>
 #include <QLocale>
+#include <QObject>
 
 
 class Utils : public QObject {
@@ -20,6 +21,7 @@ public:
 public slots:
     QString formattedBytes(qint64 bytes, int precision = 2);
     QString uuid();
+    QColor hsluv(qreal hue, qreal saturation, qreal luv, qreal alpha = 1.0);
 
 private:
     QLocale m_locale;