/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
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**
** This file is part of the QtQuick module of the Qt Toolkit.
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** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
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** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
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****************************************************************************/

#ifndef QQUICKPIXMAPCACHE_H
#define QQUICKPIXMAPCACHE_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include <QtCore/qcoreapplication.h>
#include <QtCore/qstring.h>
#include <QtGui/qpixmap.h>
#include <QtCore/qurl.h>
#include <private/qtquickglobal_p.h>
#include <QtQuick/qquickimageprovider.h>

#include <private/qintrusivelist_p.h>

QT_BEGIN_NAMESPACE

class QQmlEngine;
class QQuickPixmapData;
class QQuickTextureFactory;
class QQuickImageProviderOptionsPrivate;

class QQuickDefaultTextureFactory : public QQuickTextureFactory
{
    Q_OBJECT
public:
    QQuickDefaultTextureFactory(const QImage &i);
    QSGTexture *createTexture(QQuickWindow *window) const override;
    QSize textureSize() const override { return size; }
    int textureByteCount() const override { return size.width() * size.height() * 4; }
    QImage image() const override { return im; }

private:
    QImage im;
    QSize size;
};

class QQuickImageProviderPrivate
{
public:
    QQuickImageProvider::ImageType type;
    QQuickImageProvider::Flags flags;
    bool isProviderWithOptions;
};

// ### Qt 6: Make public moving to qquickimageprovider.h
class Q_QUICK_PRIVATE_EXPORT QQuickImageProviderOptions
{
public:
    enum AutoTransform {
        UsePluginDefaultTransform = -1,
        ApplyTransform = 0,
        DoNotApplyTransform = 1
    };

    QQuickImageProviderOptions();
    ~QQuickImageProviderOptions();

    QQuickImageProviderOptions(const QQuickImageProviderOptions&);
    QQuickImageProviderOptions& operator=(const QQuickImageProviderOptions&);

    bool operator==(const QQuickImageProviderOptions&) const;

    AutoTransform autoTransform() const;
    void setAutoTransform(AutoTransform autoTransform);

    bool preserveAspectRatioCrop() const;
    void setPreserveAspectRatioCrop(bool preserveAspectRatioCrop);

    bool preserveAspectRatioFit() const;
    void setPreserveAspectRatioFit(bool preserveAspectRatioFit);

private:
    QSharedDataPointer<QQuickImageProviderOptionsPrivate> d;
};

class Q_QUICK_PRIVATE_EXPORT QQuickPixmap
{
    Q_DECLARE_TR_FUNCTIONS(QQuickPixmap)
public:
    QQuickPixmap();
    QQuickPixmap(QQmlEngine *, const QUrl &);
    QQuickPixmap(QQmlEngine *, const QUrl &, const QSize &);
    QQuickPixmap(const QUrl &, const QImage &image);
    ~QQuickPixmap();

    enum Status { Null, Ready, Error, Loading };

    enum Option {
        Asynchronous = 0x00000001,
        Cache        = 0x00000002
    };
    Q_DECLARE_FLAGS(Options, Option)

    bool isNull() const;
    bool isReady() const;
    bool isError() const;
    bool isLoading() const;

    Status status() const;
    QString error() const;
    const QUrl &url() const;
    const QSize &implicitSize() const;
    const QSize &requestSize() const;
    QQuickImageProviderOptions::AutoTransform autoTransform() const;
    QImage image() const;
    void setImage(const QImage &);
    void setPixmap(const QQuickPixmap &other);

    QQuickTextureFactory *textureFactory() const;

    QRect rect() const;
    int width() const;
    int height() const;

    void load(QQmlEngine *, const QUrl &);
    void load(QQmlEngine *, const QUrl &, QQuickPixmap::Options options);
    void load(QQmlEngine *, const QUrl &, const QSize &);
    void load(QQmlEngine *, const QUrl &, const QSize &, QQuickPixmap::Options options);
    void load(QQmlEngine *, const QUrl &, const QSize &, QQuickPixmap::Options options, const QQuickImageProviderOptions &providerOptions);

    void clear();
    void clear(QObject *);

    bool connectFinished(QObject *, const char *);
    bool connectFinished(QObject *, int);
    bool connectDownloadProgress(QObject *, const char *);
    bool connectDownloadProgress(QObject *, int);

    static void purgeCache();
    static bool isCached(const QUrl &url, const QSize &requestSize, const QQuickImageProviderOptions &options);

    static const QLatin1String itemGrabberScheme;

private:
    Q_DISABLE_COPY(QQuickPixmap)
    QQuickPixmapData *d;
    QIntrusiveListNode dataListNode;
    friend class QQuickPixmapData;
};

Q_DECLARE_OPERATORS_FOR_FLAGS(QQuickPixmap::Options)

// This class will disappear with Qt6 and will just be the regular QQuickImageProvider
// ### Qt 6: Remove this class and fold it with QQuickImageProvider
class Q_QUICK_PRIVATE_EXPORT QQuickImageProviderWithOptions : public QQuickAsyncImageProvider
{
public:
    QQuickImageProviderWithOptions(ImageType type, Flags flags = Flags());

    QImage requestImage(const QString &id, QSize *size, const QSize& requestedSize) override;
    QPixmap requestPixmap(const QString &id, QSize *size, const QSize& requestedSize) override;
    QQuickTextureFactory *requestTexture(const QString &id, QSize *size, const QSize &requestedSize) override;
    QQuickImageResponse *requestImageResponse(const QString &id, const QSize &requestedSize) override;

    virtual QImage requestImage(const QString &id, QSize *size, const QSize& requestedSize, const QQuickImageProviderOptions &options);
    virtual QPixmap requestPixmap(const QString &id, QSize *size, const QSize& requestedSize, const QQuickImageProviderOptions &options);
    virtual QQuickTextureFactory *requestTexture(const QString &id, QSize *size, const QSize &requestedSize, const QQuickImageProviderOptions &options);
    virtual QQuickImageResponse *requestImageResponse(const QString &id, const QSize &requestedSize, const QQuickImageProviderOptions &options);

    static QSize loadSize(const QSize &originalSize, const QSize &requestedSize, const QByteArray &format, const QQuickImageProviderOptions &options);
    static QQuickImageProviderWithOptions *checkedCast(QQuickImageProvider *provider);
};

QT_END_NAMESPACE

#endif // QQUICKPIXMAPCACHE_H