qimageiohandler.h
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上传日期:2022-06-22
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- /****************************************************************************
- **
- ** Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
- ** Contact: Qt Software Information (qt-info@nokia.com)
- **
- ** This file is part of the QtGui module of the Qt Toolkit.
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- **
- **
- ** GNU General Public License Usage
- ** Alternatively, this file may be used under the terms of the GNU
- ** General Public License versions 2.0 or 3.0 as published by the Free
- ** Software Foundation and appearing in the file LICENSE.GPL included in
- ** the packaging of this file. Please review the following information
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- #ifndef QIMAGEIOHANDLER_H
- #define QIMAGEIOHANDLER_H
- #include <QtCore/qplugin.h>
- #include <QtCore/qfactoryinterface.h>
- QT_BEGIN_HEADER
- QT_BEGIN_NAMESPACE
- QT_MODULE(Gui)
- class QImage;
- class QRect;
- class QSize;
- class QVariant;
- class QImageIOHandlerPrivate;
- class Q_GUI_EXPORT QImageIOHandler
- {
- Q_DECLARE_PRIVATE(QImageIOHandler)
- public:
- QImageIOHandler();
- virtual ~QImageIOHandler();
- void setDevice(QIODevice *device);
- QIODevice *device() const;
- void setFormat(const QByteArray &format);
- void setFormat(const QByteArray &format) const;
- QByteArray format() const;
- virtual QByteArray name() const;
- virtual bool canRead() const = 0;
- virtual bool read(QImage *image) = 0;
- virtual bool write(const QImage &image);
- enum ImageOption {
- Size,
- ClipRect,
- Description,
- ScaledClipRect,
- ScaledSize,
- CompressionRatio,
- Gamma,
- Quality,
- Name,
- SubType,
- IncrementalReading,
- Endianness,
- Animation,
- BackgroundColor
- };
- virtual QVariant option(ImageOption option) const;
- virtual void setOption(ImageOption option, const QVariant &value);
- virtual bool supportsOption(ImageOption option) const;
- // incremental loading
- virtual bool jumpToNextImage();
- virtual bool jumpToImage(int imageNumber);
- virtual int loopCount() const;
- virtual int imageCount() const;
- virtual int nextImageDelay() const;
- virtual int currentImageNumber() const;
- virtual QRect currentImageRect() const;
- protected:
- QImageIOHandler(QImageIOHandlerPrivate &dd);
- QImageIOHandlerPrivate *d_ptr;
- private:
- Q_DISABLE_COPY(QImageIOHandler)
- };
- struct Q_GUI_EXPORT QImageIOHandlerFactoryInterface : public QFactoryInterface
- {
- virtual QImageIOHandler *create(QIODevice *device, const QByteArray &format = QByteArray()) const = 0;
- };
- #define QImageIOHandlerFactoryInterface_iid "com.trolltech.Qt.QImageIOHandlerFactoryInterface"
- Q_DECLARE_INTERFACE(QImageIOHandlerFactoryInterface, QImageIOHandlerFactoryInterface_iid)
- class Q_GUI_EXPORT QImageIOPlugin : public QObject, public QImageIOHandlerFactoryInterface
- {
- Q_OBJECT
- Q_INTERFACES(QImageIOHandlerFactoryInterface:QFactoryInterface)
- public:
- explicit QImageIOPlugin(QObject *parent = 0);
- virtual ~QImageIOPlugin();
- enum Capability {
- CanRead = 0x1,
- CanWrite = 0x2,
- CanReadIncremental = 0x4
- };
- Q_DECLARE_FLAGS(Capabilities, Capability)
- virtual Capabilities capabilities(QIODevice *device, const QByteArray &format) const = 0;
- virtual QStringList keys() const = 0;
- virtual QImageIOHandler *create(QIODevice *device, const QByteArray &format = QByteArray()) const = 0;
- };
- Q_DECLARE_OPERATORS_FOR_FLAGS(QImageIOPlugin::Capabilities)
- QT_END_NAMESPACE
- QT_END_HEADER
- #endif // QIMAGEIOHANDLER_H