qtextureatlas_p_p.h

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// Copyright (C) 2016 Klaralvdalens Datakonsult AB (KDAB).

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

#ifndef QT3DEXTRAS_QTEXTUREATLAS_P_P_H

#define QT3DEXTRAS_QTEXTUREATLAS_P_P_H

//

//  W A R N I N G

//  -------------

//

// This file is not part of the Qt API.  It exists for the convenience

// of other Qt classes.  This header file may change from version to

// version without notice, or even be removed.

//

// We mean it.

//

#include <QtCore/qscopedpointer.h>

#include <Qt3DRender/private/qabstracttexture_p.h>

#include <Qt3DRender/private/qtexturegenerator_p.h>

#include <Qt3DExtras/private/areaallocator_p.h>

#include <Qt3DExtras/private/qtextureatlas_p.h>

QT_BEGIN_NAMESPACE

namespace Qt3DExtras {

// Used to store texture info within atlas

struct AtlasTexture

    QRect position;

    int padding = 0;

};

// data shared between QTextureAtlasPrivate and the QTextureGenerators

// we use this extra indirection so we can lazily copy the sub-images

// into the actual texture image in the backend texture loader thread.

class QTextureAtlasData

public:

    QTextureAtlasData(int w, int h, QImage::Format fmt);

    ~QTextureAtlasData();

    int width() const { return m_image.width(); }

    int height() const { return m_image.height(); }

    void addImage(const AtlasTexture &texture, const QImage &image);

    QByteArray createUpdatedImageData();

private:

    struct Update {

        AtlasTexture textureInfo;

        QImage image;

};

    QMutex m_mutex;

    QImage m_image;

    QList<Update> m_updates;

};

typedef QSharedPointer<QTextureAtlasData> QTextureAtlasDataPtr;

class QTextureAtlasPrivate : public Qt3DRender::QAbstractTexturePrivate

public:

    QTextureAtlasPrivate();

    ~QTextureAtlasPrivate();

    Q_DECLARE_PUBLIC(QTextureAtlas)

    QTextureAtlas::TextureId m_currId = 1;  // IDs for new sub-textures

    int m_currGen = 0;

    QTextureAtlasDataPtr m_data;

    QScopedPointer<AreaAllocator> m_allocator;

    QOpenGLTexture::PixelFormat m_pixelFormat;

    QHash<QTextureAtlas::TextureId, AtlasTexture> m_textures;

};

class QTextureAtlasGenerator : public Qt3DRender::QTextureGenerator

public:

    QTextureAtlasGenerator(const QTextureAtlasPrivate *texAtlas);

    ~QTextureAtlasGenerator();

    Qt3DRender::QTextureDataPtr operator()() override;

    bool operator==(const QTextureGenerator &other) const override;

    QT3D_FUNCTOR(QTextureAtlasGenerator)

private:

    QTextureAtlasDataPtr m_data;

    Qt3DRender::QAbstractTexture::TextureFormat m_format;

    QOpenGLTexture::PixelFormat m_pixelFormat;

    int m_generation;

    Qt3DCore::QNodeId m_atlasId;

};

typedef QSharedPointer<QTextureAtlasGenerator> QTextureAtlasGeneratorPtr;

} // namespace Qt3DExtras

QT_END_NAMESPACE

#endif // QT3DEXTRAS_QTEXTUREATLAS_P_P_H