TextureTile.h

/*
    SPDX-FileCopyrightText: 2010 Jens-Michael Hoffmann <jmho@c-xx.com>
    SPDX-FileCopyrightText: 2012 Ander Pijoan <ander.pijoan@deusto.es>
 
    SPDX-License-Identifier: LGPL-2.1-or-later
*/
 
#ifndef MARBLE_TEXTURETILE_H
#define MARBLE_TEXTURETILE_H
 
#include <QImage>
 
#include "Tile.h"
 
namespace Marble
{
class Blending;
class TileId;
 
/*!
    \class TextureTile
    \brief A class that resembles an image tile (extends Tile).
 
    This tile provides a bitmap image for a certain (geographic) area and
    for a given zoom level. Each Tile can be identified via a unique
    TileId.
 
    A stack of Tiles that cover the same area and the same
    zoom level can be stored (and painted) layer by layer in a StackedTile object.
    For this purpose each Tile specifies a blending type.
 
    Usually the tiles are organized in so called quad tiles: This means that
    with increasing zoom level four other tiles cover the same area as a
    single "parent" tile in the previous zoom level. These four tiles have
    the same pixel size as the "parent" tile.
 
    The process of "filling the tile with data is done in stages: The
    State describes the current progress of loading the data (Empty, Scaled,
    Expired, StateUptodate).
 
    The life time cycle of a Tile can also be influenced by its
    expiration time which will trigger a reload of the tile data.
*/
 
class TextureTile : public Tile
{
public:
    TextureTile(TileId const &tileId, QImage const &image, const Blending *blending);
    ~TextureTile() override;
 
    /*!
        \brief Returns the QImage that describes the look of the Tile
        \return A non-zero pointer to a QImage associated with the tile.
    */
    QImage const *image() const;
 
    /*!
        \brief Returns the kind of blending used for the texture tile.
        \return A pointer to the blending object used for painting/merging the Tile.
 
        If no blending is set the pointer returned will be zero.
    */
    Blending const *blending() const;
 
    int byteCount() const;
 
private:
    Q_DISABLE_COPY(TextureTile)
 
    QImage const m_image;
    Blending const *const m_blending;
};
 
inline QImage const *TextureTile::image() const
{
    return &m_image;
}
 
inline Blending const *TextureTile::blending() const
{
    return m_blending;
}
 
inline int TextureTile::byteCount() const
{
    return m_image.sizeInBytes();
}
}
 
#endif // MARBLE_TEXTURETILE_H