/*
 *  copyright (c) 2002 patrick julien <freak@codepimps.org>
 *
 *  this program is free software; you can redistribute it and/or modify
 *  it under the terms of the gnu general public license as published by
 *  the free software foundation; either version 2 of the license, or
 *  (at your option) any later version.
 *
 *  this program is distributed in the hope that it will be useful,
 *  but without any warranty; without even the implied warranty of
 *  merchantability or fitness for a particular purpose.  see the
 *  gnu general public license for more details.
 *
 *  you should have received a copy of the gnu general public license
 *  along with this program; if not, write to the free software
 *  foundation, inc., 675 mass ave, cambridge, ma 02139, usa.
 */
#ifndef KIS_PAINT_DEVICE_IMPL_H_
#define KIS_PAINT_DEVICE_IMPL_H_

#include <qcolor.h>
#include <qobject.h>
#include <qpixmap.h>
#include <qptrlist.h>
#include <qrect.h>
#include <qvaluelist.h>
#include <qstring.h>

#include "kis_types.h"
#include "kdebug.h"
#include "kis_global.h"
#include "kis_image.h"
#include "kis_colorspace.h"
#include "kis_canvas_controller.h"
#include "kis_color.h"
#include <koffice_export.h>

class DCOPObject;

class QImage;
class QSize;
class QPoint;
class QWMatrix;
class QTimer;

class KNamedCommand;

class KoStore;

class KisExifInfo;
class KisHLineIteratorPixel;
class KisImage;
class KisRectIteratorPixel;
class KisVLineIteratorPixel;
class KisRandomAccessorPixel;
class KisRandomSubAccessorPixel;
class KisUndoAdapter;
class KisFilter;
class KisDataManager;
typedef KSharedPtr<KisDataManager> KisDataManagerSP;

class KisMemento;
typedef KSharedPtr<KisMemento> KisMementoSP;


/**
 * A paint device contains the actual pixel data and offers methods
 * to read and write pixels. A paint device has an integer x,y position
 * (i.e., are not positioned on the image with sub-pixel accuracy).
 * A KisPaintDevice doesn't have any fixed size, the size change dynamicaly
 * when pixels are accessed by an iterator.
 */
class KRITACORE_EXPORT KisPaintDevice
    : public QObject
    , public KShared
{

        Q_OBJECT

public:

    /**
     * Create a new paint device with the specified colorspace.
     *
     * @param colorSpace the colorspace of this paint device
     * @param name for debugging purposes
     */
    KisPaintDevice(KisColorSpace * colorSpace, const char * name = 0);

    /**
     * Create a new paint device with the specified colorspace. The
     * parentLayer will be notified of changes to this paint device.
     *
     * @param parentLayer the layer that contains this paint device.
     * @param colorSpace the colorspace of this paint device
     * @param name for debugging purposes
     */
    KisPaintDevice(KisLayer *parentLayer, KisColorSpace * colorSpace, const char * name = 0);

    KisPaintDevice(const KisPaintDevice& rhs);
    virtual ~KisPaintDevice();
    virtual DCOPObject *dcopObject();

    void lock(bool lock) { m_lock = lock; }

public:

    /**
     * Write the pixels of this paint device into the specified file store.
     */
    virtual bool write(KoStore *store);

    /**
     * Fill this paint device with the pixels from the specified file store.
     */
    virtual bool read(KoStore *store);

public:

    /**
     * Moves the device to these new coordinates (so no incremental move or so)
     */
    virtual void move(Q_INT32 x, Q_INT32 y);

    /**
     * Convenience method for the above
     */
    virtual void move(const QPoint& pt);

    /**
     * Move the paint device to the specified location and make it possible to
     * undo the move.
     */
    virtual KNamedCommand * moveCommand(Q_INT32 x, Q_INT32 y);

    /**
     * Returns true of x,y is within the extent of this paint device
     */
    bool contains(Q_INT32 x, Q_INT32 y) const;

    /**
     * Convenience method for the above
     */
    bool contains(const QPoint& pt) const;

    /**
     * Retrieve the bounds of the paint device. The size is not exact,
     * but may be larger if the underlying datamanager works that way.
     * For instance, the tiled datamanager keeps the extent to the nearest
     * multiple of 64.
     */
    virtual void extent(Q_INT32 &x, Q_INT32 &y, Q_INT32 &w, Q_INT32 &h) const;
    virtual QRect extent() const;

    /**
     * XXX: This should be a temporay hack, awaiting a proper fix.
     *
     * Indicates whether the extent really represents the extent. For example,
     * the KisBackground checkerboard pattern is generated by filling the
     * default tile but it will return an empty extent.
     */
    bool extentIsValid() const;

    /// Convience method for the above
    void setExtentIsValid(bool isValid);

    /**
     * Get the exact bounds of this paint device. This may be very slow,
     * especially on larger paint devices because it does a linear scanline search.
     */
    virtual void exactBounds(Q_INT32 &x, Q_INT32 &y, Q_INT32 &w, Q_INT32 &h) const;
    virtual QRect exactBounds() const;
    virtual QRect exactBoundsOldMethod() const;
    virtual QRect exactBoundsImprovedOldMethod() const;

    /**
     * Cut the paint device down to the specified rect
     */
    void crop(Q_INT32 x, Q_INT32 y, Q_INT32 w, Q_INT32 h);

    /// Convience method for the above
    void crop(QRect r);

    /**
     * Complete erase the current paint device. Its size will become 0.
     */
    virtual void clear();

    /**
     * Fill the given rectangle with the given pixel.
     */
    void fill(Q_INT32 x, Q_INT32 y, Q_INT32 w, Q_INT32 h, const Q_UINT8 *fillPixel);

    /**
     * Read the bytes representing the rectangle described by x, y, w, h into
     * data. If data is not big enough, Krita will gladly overwrite the rest
     * of your precious memory.
     *
     * Since this is a copy, you need to make sure you have enough memory.
     *
     * Reading from areas not previously initialized will read the default
     * pixel value into data but not initialize that region.
     */
    virtual void readBytes(Q_UINT8 * data, Q_INT32 x, Q_INT32 y, Q_INT32 w, Q_INT32 h);

    /**
     * Copy the bytes in data into the rect specified by x, y, w, h. If the
     * data is too small or uninitialized, Krita will happily read parts of
     * memory you never wanted to be read.
     *
     * If the data is written to areas of the paint device not previously initialized,
     * the paint device will grow.
     */
    virtual void writeBytes(const Q_UINT8 * data, Q_INT32 x, Q_INT32 y, Q_INT32 w, Q_INT32 h);

    /**
     * Get the number of contiguous columns starting at x, valid for all values
     * of y between minY and maxY.
     */
    Q_INT32 numContiguousColumns(Q_INT32 x, Q_INT32 minY, Q_INT32 maxY);

    /**
     * Get the number of contiguous rows starting at y, valid for all values
     * of x between minX and maxX.
     */
    Q_INT32 numContiguousRows(Q_INT32 y, Q_INT32 minX, Q_INT32 maxX);

    /**
     * Get the row stride at pixel (x, y). This is the number of bytes to add to a
     * pointer to pixel (x, y) to access (x, y + 1).
     */
    Q_INT32 rowStride(Q_INT32 x, Q_INT32 y);

    /**
     * Get a read-only pointer to pixel (x, y).
     */
    KDE_DEPRECATED const Q_UINT8* pixel(Q_INT32 x, Q_INT32 y);

    /**
     * Get a read-write pointer to pixel (x, y).
     */
    KDE_DEPRECATED Q_UINT8* writablePixel(Q_INT32 x, Q_INT32 y);

    /**
     *   Converts the paint device to a different colorspace
     */
    virtual void convertTo(KisColorSpace * dstColorSpace, Q_INT32 renderingIntent = INTENT_PERCEPTUAL);

    /**
     * Changes the profile of the colorspace of this paint device to the given
     * profile. If the given profile is 0, nothing happens.
     */
    virtual void setProfile(KisProfile * profile);
    
    /**
     * Fill this paint device with the data from img; starting at (offsetX, offsetY)
     * @param srcProfileName name of the RGB profile to interpret the img as. "" is interpreted as sRGB
     */
    virtual void convertFromQImage(const QImage& img, const QString &srcProfileName, Q_INT32 offsetX = 0, Q_INT32 offsetY = 0);

    /**
     * Create an RGBA QImage from a rectangle in the paint device.
     *
     * @param x Left coordinate of the rectangle
     * @param y Top coordinate of the rectangle
     * @param w Width of the rectangle in pixels
     * @param h Height of the rectangle in pixels
     * @param dstProfile RGB profile to use in conversion. May be 0, in which
     * case it's up to the colour strategy to choose a profile (most
     * like sRGB).
     * @param exposure The exposure setting used to render a preview of a high dynamic range image.
     */
    virtual QImage convertToQImage(KisProfile *  dstProfile, Q_INT32 x, Q_INT32 y, Q_INT32 w, Q_INT32 h, float exposure = 0.0f);

    /**
     * Create an RGBA QImage from a rectangle in the paint device. The rectangle is defined by the parent image's bounds.
     *
     * @param dstProfile RGB profile to use in conversion. May be 0, in which
     * case it's up to the colour strategy to choose a profile (most
     * like sRGB).
     * @param exposure The exposure setting used to render a preview of a high dynamic range image.
     */
    virtual QImage convertToQImage(KisProfile *  dstProfile, float exposure = 0.0f);

    /**
     * Creates a paint device thumbnail of the paint device, retaining the aspect ratio.
     * The width and height of the returned device won't exceed \p maxw and \p maxw, but they may be smaller.
     */

    KisPaintDeviceSP createThumbnailDevice(Q_INT32 w, Q_INT32 h);
            
    /**
     * Creates a thumbnail of the paint device, retaining the aspect ratio.
     * The width and height of the returned QImage won't exceed \p maxw and \p maxw, but they may be smaller.
     * The colors are not corrected for display!
     */
    virtual QImage createThumbnail(Q_INT32 maxw, Q_INT32 maxh);


    /**
     * Fill c and opacity with the values found at x and y.
     *
     * The color values will be transformed from the profile of
     * this paint device to the display profile.
     *
     * @return true if the operation was succesful.
     */
    bool pixel(Q_INT32 x, Q_INT32 y, QColor *c, Q_UINT8 *opacity);


    /**
     * Fill kc with the values found at x and y. This method differs
     * from the above in using KisColor, which can be of any colorspace
     *
     * The color values will be transformed from the profile of
     * this paint device to the display profile.
     *
     * @return true if the operation was succesful.
     */
    bool pixel(Q_INT32 x, Q_INT32 y, KisColor * kc);

    /**
     * Return the KisColor of the pixel at x,y.
     */
    KisColor colorAt(Q_INT32 x, Q_INT32 y);

    /**
     * Set the specified pixel to the specified color. Note that this
     * bypasses KisPainter. the PaintDevice is here used as an equivalent
     * to QImage, not QPixmap. This means that this is not undoable; also,
     * there is no compositing with an existing value at this location.
     *
     * The color values will be transformed from the display profile to
     * the paint device profile.
     *
     * Note that this will use 8-bit values and may cause a significant
     * degradation when used on 16-bit or hdr quality images.
     *
     * @return true if the operation was succesful
     *
     */
    bool setPixel(Q_INT32 x, Q_INT32 y, const QColor& c, Q_UINT8 opacity);

    bool setPixel(Q_INT32 x, Q_INT32 y, const KisColor& kc);

    KisColorSpace * colorSpace() const;

    KisDataManagerSP dataManager() const;

    /**
     * Replace the pixel data, color strategy, and profile.
     */
    void setData(KisDataManagerSP data, KisColorSpace * colorSpace);

    /**
     * The X offset of the paint device
     */
    Q_INT32 getX() const;

    /**
     * The Y offset of the paint device
     */
    Q_INT32 getY() const;

    /**
     * Return the X offset of the paint device
     */
    void setX(Q_INT32 x);

    /**
     * Return the Y offset of the paint device
     */
    void setY(Q_INT32 y);


    /**
     * Return the number of bytes a pixel takes.
     */
    virtual Q_INT32 pixelSize() const;

    /**
     * Return the number of channels a pixel takes
     */
    virtual Q_INT32 nChannels() const;

    /**
     * Return the image that contains this paint device, or 0 if it is not
     * part of an image. This is the same as calling parentLayer()->image().
     */
    KisImage *image() const;

    /**
     * Returns the KisLayer that contains this paint device, or 0 if this is not
     * part of a layer.
     */
    KisLayer *parentLayer() const;

    /**
     * Set the KisLayer that contains this paint device, or 0 if this is not
     * part of a layer.
     */
    void setParentLayer(KisLayer *parentLayer);

    /**
     * Add the specified rect top the parent layer (if present)
     */
    virtual void setDirty(const QRect & rc);

    /**
     * Set the parent layer completely dirty, if this paint device has one.
     */
    virtual void setDirty();
    
    
    /**
     * Mirror the device along the X axis
     */
    void mirrorX();
    /**
     * Mirror the device along the Y axis
     */
    void mirrorY();

    KisMementoSP getMemento();
    void rollback(KisMementoSP memento);
    void rollforward(KisMementoSP memento);

    /**
     * This function return an iterator which points to the first pixel of an rectangle
     */
    KisRectIteratorPixel createRectIterator(Q_INT32 left, Q_INT32 top, Q_INT32 w, Q_INT32 h, bool writable);

    /**
     * This function return an iterator which points to the first pixel of a horizontal line
     */
    KisHLineIteratorPixel createHLineIterator(Q_INT32 x, Q_INT32 y, Q_INT32 w, bool writable);

    /**
     * This function return an iterator which points to the first pixel of a vertical line
     */
    KisVLineIteratorPixel createVLineIterator(Q_INT32 x, Q_INT32 y, Q_INT32 h, bool writable);

    /**
     * This function creates a random accessor which allow to randomly access any pixels on
     * the paint device.
     * <b>Note:</b> random access is way slower than iterators, allways use iterators whenever
     * you can
     */
    KisRandomAccessorPixel createRandomAccessor(Q_INT32 x, Q_INT32 y, bool writable);
    
    /**
     * This function create a random accessor which can easily access to sub pixel values.
     */
    KisRandomSubAccessorPixel createRandomSubAccessor();
    
    /** Get the current selection or create one if this paintdevice hasn't got a selection yet. */
    KisSelectionSP selection();

    /** Adds the specified selection to the currently active selection for this paintdevice */
    void addSelection(KisSelectionSP selection);

    /** Subtracts the specified selection from the currently active selection for this paindevice */
    void subtractSelection(KisSelectionSP selection);

    /** Whether there is a valid selection for this paintdevice. */
    bool hasSelection();

   /** Whether the previous selection was deselected. */
    bool selectionDeselected();

    /** Deselect the selection for this paintdevice. */
    void deselect();

    /** Reinstates the old selection */
    void reselect();
        
    /** Clear the selected pixels from the paint device */
    void clearSelection();

    /**
     * Apply a mask to the image data, i.e. multiply each pixel's opacity by its
     * selectedness in the mask.
     */
    void applySelectionMask(KisSelectionSP mask);

    /**
     * Sets the selection of this paint device to the new selection,
     * returns the old selection, if there was an old selection,
     * otherwise 0
     */
    KisSelectionSP setSelection(KisSelectionSP selection);

    /**
     * Notify the owning image that the current selection has changed.
     */
    void emitSelectionChanged();

    /**
     * Notify the owning image that the current selection has changed.
     *
     * @param r the area for which the selection has changed
     */
    void emitSelectionChanged(const QRect& r);

    
    KisUndoAdapter *undoAdapter() const;

    /**
     * Return the exifInfo associated with this layer. If no exif infos are
     * available, the function will create it.
     */
    KisExifInfo* exifInfo();
    /**
     * This function return true if the layer has exif info associated with it.
     */
    bool hasExifInfo() { return m_exifInfo != 0; }
signals:
    void positionChanged(KisPaintDeviceSP device);
    void ioProgress(Q_INT8 percentage);
    void profileChanged(KisProfile *  profile);

private slots:

    void runBackgroundFilters();
    
private:
    KisPaintDevice& operator=(const KisPaintDevice&);

protected:
    KisDataManagerSP m_datamanager;
    
private:
    /* The KisLayer that contains this paint device, or 0 if this is not 
     * part of a layer.
     */
    KisLayer *m_parentLayer;

    bool m_extentIsValid;

    Q_INT32 m_x;
    Q_INT32 m_y;
    KisColorSpace * m_colorSpace;
    // Cached for quick access
    Q_INT32 m_pixelSize;
    Q_INT32 m_nChannels;

    // Whether the selection is active
    bool m_hasSelection;
    bool m_selectionDeselected;
    
    // Contains the actual selection. For now, there can be only
    // one selection per layer. XXX: is this a limitation?
    KisSelectionSP m_selection;
    
    DCOPObject * m_dcop;

    KisExifInfo* m_exifInfo;

    QValueList<KisFilter*> m_longRunningFilters;
    QTimer * m_longRunningFilterTimer;

    bool m_lock;
};

inline Q_INT32 KisPaintDevice::pixelSize() const
{
    Q_ASSERT(m_pixelSize > 0);
    return m_pixelSize;
}

inline Q_INT32 KisPaintDevice::nChannels() const
{
    Q_ASSERT(m_nChannels > 0);
    return m_nChannels;
;
}

inline KisColorSpace * KisPaintDevice::colorSpace() const
{
    Q_ASSERT(m_colorSpace != 0);
        return m_colorSpace;
}


inline Q_INT32 KisPaintDevice::getX() const
{
    return m_x;
}

inline Q_INT32 KisPaintDevice::getY() const
{
    return m_y;
}

#endif // KIS_PAINT_DEVICE_IMPL_H_