plugin: add image analyser

1 files changed, 61 insertions, 0 deletions

diff --git a/plugin/src/Caelestia/imageanalyser.hpp b/plugin/src/Caelestia/imageanalyser.hpp
new file mode 100644
index 0000000..bbea2b3
--- /dev/null
+++ b/plugin/src/Caelestia/imageanalyser.hpp
@@ -0,0 +1,61 @@
+#pragma once
+
+#include <QtQuick/qquickitem.h>
+#include <qfuture.h>
+#include <qfuturewatcher.h>
+#include <qobject.h>
+#include <qqmlintegration.h>
+
+namespace caelestia {
+
+class ImageAnalyser : public QObject {
+    Q_OBJECT
+    QML_ELEMENT
+
+    Q_PROPERTY(QString source READ source WRITE setSource NOTIFY sourceChanged)
+    Q_PROPERTY(QQuickItem* sourceItem READ sourceItem WRITE setSourceItem NOTIFY sourceItemChanged)
+    Q_PROPERTY(int rescaleSize READ rescaleSize WRITE setRescaleSize NOTIFY rescaleSizeChanged)
+    Q_PROPERTY(QColor dominantColour READ dominantColour NOTIFY dominantColourChanged)
+    Q_PROPERTY(qreal luminance READ luminance NOTIFY luminanceChanged)
+
+public:
+    explicit ImageAnalyser(QObject* parent = nullptr);
+
+    [[nodiscard]] QString source() const;
+    void setSource(const QString& source);
+
+    [[nodiscard]] QQuickItem* sourceItem() const;
+    void setSourceItem(QQuickItem* sourceItem);
+
+    [[nodiscard]] int rescaleSize() const;
+    void setRescaleSize(int rescaleSize);
+
+    [[nodiscard]] QColor dominantColour() const;
+    [[nodiscard]] qreal luminance() const;
+
+    Q_INVOKABLE void requestUpdate();
+
+signals:
+    void sourceChanged();
+    void sourceItemChanged();
+    void rescaleSizeChanged();
+    void dominantColourChanged();
+    void luminanceChanged();
+
+private:
+    using AnalyseResult = QPair<QColor, qreal>;
+
+    QFutureWatcher<AnalyseResult>* const m_futureWatcher;
+
+    QString m_source;
+    QQuickItem* m_sourceItem;
+    int m_rescaleSize;
+
+    QColor m_dominantColour;
+    qreal m_luminance;
+
+    void update();
+    static void analyse(QPromise<AnalyseResult>& promise, const QImage& image, int rescaleSize);
+};
+
+} // namespace caelestia