kis_alpha_mask.h

/*
 *  Copyright (c) 2004 Boudewijn Rempt <boud@valdyas.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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
#ifndef KIS_ALPHA_MASK_
#define KIS_ALPHA_MASK_
 
#include <tqimage.h>
#include <tqvaluevector.h>
 
#include <ksharedptr.h>
 
#include "kis_global.h"
#include "kis_types.h"
 
class KisAlphaMask : public TDEShared {
    
 public:
    KisAlphaMask(const TQImage& img);
 
    KisAlphaMask(const TQImage& img, bool hasColor);
 
    KisAlphaMask(TQ_INT32 width, TQ_INT32 height);
 
    virtual ~KisAlphaMask();
 
    TQ_INT32 height() const;
 
       TQ_INT32 width() const;
 
    inline TQ_UINT8 alphaAt(TQ_INT32 x, TQ_INT32 y) const
    {
    if (y >= 0 && y < m_height && x >= 0 && x < m_width) {
        return m_data[(y * m_width) + x];
    }
    else {
        return OPACITY_TRANSPARENT;
    }
    }
 
    void setAlphaAt(TQ_INT32 x, TQ_INT32 y, TQ_UINT8 alpha);
 
    // Create a new mask by interpolating between mask1 and mask2 as t
    // goes from 0 to 1.
    static KisAlphaMaskSP interpolate(KisAlphaMaskSP mask1, KisAlphaMaskSP mask2, double t);
 
private:
    void computeAlpha(const TQImage& img);
    void copyAlpha(const TQImage& img);
 
    TQValueVector<TQ_UINT8> m_data;
    TQ_INT32 m_width;
    TQ_INT32 m_height;
};
 
#endif // KIS_ALPHA_MASK_