Add plugin for animated Windows cursors (ANI)

src/imageformats/ani_p.h

@@ -0,0 +1,69 @@
+/*
+    SPDX-FileCopyrightText: 2020 Kai Uwe Broulik <kde@broulik.de>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#ifndef KIMG_ANI_P_H
+#define KIMG_ANI_P_H
+
+#include <QImageIOPlugin>
+#include <QSize>
+
+class ANIHandler : public QImageIOHandler
+{
+public:
+    ANIHandler();
+
+    bool canRead() const override;
+    bool read(QImage *image) override;
+
+    int currentImageNumber() const override;
+    int imageCount() const override;
+    bool jumpToImage(int imageNumber) override;
+    bool jumpToNextImage() override;
+
+    int loopCount() const override;
+    int nextImageDelay() const override;
+
+    bool supportsOption(ImageOption option) const override;
+    QVariant option(ImageOption option) const override;
+
+    static bool canRead(QIODevice *device);
+
+private:
+    bool ensureScanned() const;
+
+    bool m_scanned = false;
+
+    int m_currentImageNumber = 0;
+
+    int m_frameCount = 0; // "physical" frames
+    int m_imageCount = 0; // logical images
+    // Stores a custom sequence of images
+    QVector<int> m_imageSequence;
+    // and the corresponding offsets where they are
+    // since we can't read the image data sequentally in this case then
+    QVector<qint64> m_frameOffsets;
+    qint64 m_firstFrameOffset = 0;
+
+    int m_displayRate = 0;
+    QVector<int> m_displayRates;
+
+    QString m_name;
+    QString m_artist;
+    QSize m_size;
+
+};
+
+class ANIPlugin : public QImageIOPlugin
+{
+    Q_OBJECT
+    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QImageIOHandlerFactoryInterface" FILE "ani.json")
+
+public:
+    Capabilities capabilities(QIODevice *device, const QByteArray &format) const override;
+    QImageIOHandler *create(QIODevice *device, const QByteArray &format = QByteArray()) const override;
+};
+
+#endif // KIMG_ANI_P_H