kis_tile_data_wrapper.h

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/*
 *  SPDX-FileCopyrightText: 2009 Dmitry Kazakov <dimula73@gmail.com>
 *
 *  SPDX-License-Identifier: GPL-2.0-or-later
 */
 
#ifndef __KIS_TILE_DATA_WRAPPER_H
#define __KIS_TILE_DATA_WRAPPER_H
 
 
class KisTileDataWrapper
{
public:
    enum accessType {
        READ,
        WRITE
    };
 
    inline KisTileDataWrapper(KisTiledDataManager *dm,
                              qint32 x, qint32 y,
                              enum KisTileDataWrapper::accessType type)
    {
        const qint32 col = dm->xToCol(x);
        const qint32 row = dm->yToRow(y);
 
        /* FIXME: Always positive? */
        const qint32 xInTile = x - col * KisTileData::WIDTH;
        const qint32 yInTile = y - row * KisTileData::HEIGHT;
 
        const qint32 pixelIndex = xInTile + yInTile * KisTileData::WIDTH;
 
        KisTileSP tile = dm->getTile(col, row, type == WRITE);
 
        m_tile = tile;
        m_offset = pixelIndex * dm->pixelSize();
 
        if (type == READ) {
            m_tile->lockForRead();
        }
        else {
            m_tile->lockForWrite();
        }
 
        m_type = type;
    }
 
    virtual ~KisTileDataWrapper()
    {
        if (m_type == READ) {
            m_tile->unlockForRead();
        } else {
            m_tile->unlockForWrite();
        }
    }
 
    inline qint32 offset() const
    {
        return m_offset;
    }
 
    inline KisTileSP& tile()
    {
        return m_tile;
    }
 
    inline quint8* data() const
    {
        return m_tile->data() + m_offset;
    }
 
private:
    Q_DISABLE_COPY(KisTileDataWrapper)
 
    KisTileSP m_tile;
    qint32 m_offset;
    KisTileDataWrapper::accessType m_type;
};
#endif /* __KIS_TILE_DATA_WRAPPER_H */