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Add XCursor image format plug-in

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Allows to read XCursor files, including ones with animation.

The cursor hotspot is set in QImage textKeys as "HotspotX" and "HotspotY".
The "Sizes" textKey contains a list of available sizes in this file.
This commit is contained in:
Kai Uwe Broulik
2026-01-30 19:22:12 +01:00
parent 2c8a1ad6ff
commit 0c25cb5b8c
16 changed files with 564 additions and 0 deletions
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src/imageformats/xcursor_p.h Normal file
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/*
* SPDX-FileCopyrightText: 2026 Kai Uwe Broulik <kde@broulik.de>
*
* SPDX-License-Identifier: LGPL-2.0-or-later
*/
#ifndef KIMG_XCURSOR_P_H
#define KIMG_XCURSOR_P_H
#include <QImageIOPlugin>
#include <QSize>
#include <optional>
struct XCursorImage {
qint64 offset;
quint32 delay;
};
class XCursorHandler : public QImageIOHandler
{
public:
XCursorHandler();
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;
void setOption(ImageOption option, const QVariant &value) override;
static bool canRead(QIODevice *device);
private:
bool ensureScanned() const;
void pickSize();
bool m_scanned = false;
int m_currentImageNumber = 0;
QSize m_scaledSize;
int m_currentSize = 0;
QMap<int /*size*/, QVector<qint64 /*offset*/>> m_images;
int m_nextImageDelay = 0;
std::optional<QPoint> m_hotspot;
};
class XCursorPlugin : public QImageIOPlugin
{
Q_OBJECT
Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QImageIOHandlerFactoryInterface" FILE "xcursor.json")
public:
Capabilities capabilities(QIODevice *device, const QByteArray &format) const override;
QImageIOHandler *create(QIODevice *device, const QByteArray &format = QByteArray()) const override;
};
#endif // KIMG_XCURSOR_P_H