TileLoaderHelper.h

/*
    SPDX-FileCopyrightText: 2005-2007 Torsten Rahn <tackat@kde.org>
    SPDX-FileCopyrightText: 2007 Inge Wallin <ingwa@kde.org>
    SPDX-FileCopyrightText: 2008 Patrick Spendrin <ps_ml@gmx.de>
    SPDX-FileCopyrightText: 2008 Jens-Michael Hoffmann <jensmh@gmx.de>
 
    SPDX-License-Identifier: LGPL-2.0-or-later
*/
 
#ifndef MARBLE_TILELOADERHELPER_H
#define MARBLE_TILELOADERHELPER_H
 
#include "marble_export.h"
 
namespace Marble
{
 
namespace TileLoaderHelper
{
    /**
     * @brief Get the maximum number of tile rows for a given tile level.
     * @param levelZeroRows  the number of rows in level zero
     * @param level  the tile level
     * @return       the maximum number of rows that a map level was tiled into. 
     *               If the tile level number is invalid then "-1" gets 
     *               returned so this case of wrong input data can get caught 
     *               by the code which makes use of it.
     */
    MARBLE_EXPORT int levelToRow( int levelZeroRows, int level );
 
    /**
     * @brief Get the maximum number of tile columns for a given tile level.
     * @param levelZeroColumns  the number of columns in level zero
     * @param level  the tile level
     * @return       the maximum number of columns that a map level was tiled into. 
     *               If the tile level number is invalid then "-1" gets 
     *               returned so this case of wrong input data can get caught 
     *               by the code which makes use of it.
     */
    MARBLE_EXPORT int levelToColumn( int levelZeroColumns, int level );
 
    /**
     * @brief Get the tile level for the given maximum number of tile columns.
     * @param levelZeroRows  the number of rows in level zero
     * @param row    the maximum number of rows that a map level was tiled into.
     * @return       the corresponding tile level.
     *               If the number of rows is invalid then "-1" gets 
     *               returned so this case of wrong input data can get caught 
     *               by the code which makes use of it.
     */
    MARBLE_EXPORT int rowToLevel( int levelZeroRows, int row );
 
    /**
     * @brief Get the tile level for the given maximum number of tile columns.
     * @param levelZeroColumns  the number of columns in level zero
     * @param column the maximum number of columns that a map level was tiled into.
     * @return       the corresponding tile level.
     *               If the number of columns is invalid then "-1" gets 
     *               returned so this case of wrong input data can get caught 
     *               by the code which makes use of it.
     */
    MARBLE_EXPORT int columnToLevel( int levelZeroColumns, int column );
}
 
}
 
#endif // MARBLE_TILELOADERHELPER_H