Add plugin for JPEG XL (JXL)

2025-07-18 20:04:16 -04:00 · 2021-11-10 15:08:54 +01:00
parent fb66044714
commit 41c4b5930c
11 changed files with 1005 additions and 1 deletions
--- a/src/imageformats/jxl_p.h
+++ b/src/imageformats/jxl_p.h
@ -0,0 +1,96 @@
+/*
+    JPEG XL (JXL) support for QImage.
+
+    SPDX-FileCopyrightText: 2021 Daniel Novomesky <dnovomesky@gmail.com>
+
+    SPDX-License-Identifier: BSD-2-Clause
+*/
+
+#ifndef KIMG_JXL_P_H
+#define KIMG_JXL_P_H
+
+#include <QByteArray>
+#include <QColorSpace>
+#include <QImage>
+#include <QImageIOHandler>
+#include <QImageIOPlugin>
+#include <QVariant>
+#include <QVector>
+
+#include <jxl/decode.h>
+
+class QJpegXLHandler : public QImageIOHandler
+{
+public:
+    QJpegXLHandler();
+    ~QJpegXLHandler();
+
+    bool canRead() const override;
+    bool read(QImage *image) override;
+    bool write(const QImage &image) override;
+
+    static bool canRead(QIODevice *device);
+
+    QVariant option(ImageOption option) const override;
+    void setOption(ImageOption option, const QVariant &value) override;
+    bool supportsOption(ImageOption option) const override;
+
+    int imageCount() const override;
+    int currentImageNumber() const override;
+    bool jumpToNextImage() override;
+    bool jumpToImage(int imageNumber) override;
+
+    int nextImageDelay() const override;
+
+    int loopCount() const override;
+
+private:
+    bool ensureParsed() const;
+    bool ensureALLCounted() const;
+    bool ensureDecoder();
+    bool countALLFrames();
+    bool decode_one_frame();
+    bool rewind();
+
+    enum ParseJpegXLState {
+        ParseJpegXLError = -1,
+        ParseJpegXLNotParsed = 0,
+        ParseJpegXLSuccess = 1,
+        ParseJpegXLBasicInfoParsed = 2,
+    };
+
+    ParseJpegXLState m_parseState;
+    int m_quality;
+    int m_currentimage_index;
+    int m_previousimage_index;
+
+    QByteArray m_rawData;
+
+    JxlDecoder *m_decoder;
+    void *m_runner;
+    JxlBasicInfo m_basicinfo;
+
+    QVector<int> m_framedelays;
+    int m_next_image_delay;
+
+    QImage m_current_image;
+    QColorSpace m_colorspace;
+
+    QImage::Format m_input_image_format;
+    QImage::Format m_target_image_format;
+
+    JxlPixelFormat m_input_pixel_format;
+    size_t m_buffer_size;
+};
+
+class QJpegXLPlugin : public QImageIOPlugin
+{
+    Q_OBJECT
+    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QImageIOHandlerFactoryInterface" FILE "jxl.json")
+
+public:
+    Capabilities capabilities(QIODevice *device, const QByteArray &format) const override;
+    QImageIOHandler *create(QIODevice *device, const QByteArray &format = QByteArray()) const override;
+};
+
+#endif // KIMG_JXL_P_H