GLImageItterator.cpp

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////////////////////////////////////////////////////////////////////////////////
//    Scorched3D (c) 2000-2009
//
//    This file is part of Scorched3D.
//
//    Scorched3D 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.
//
//    Scorched3D 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 Scorched3D; if not, write to the Free Software
//    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
////////////////////////////////////////////////////////////////////////////////

#include <GLEXT/GLImageItterator.h>

ImageItterator::ImageItterator(Image &bitmap,
                                                                        int destX,
                                                                        int destY,
                                                                        Type type)
        : bitmap_(bitmap), type_(type)
{
        if (type == stretch)
        {
                dx_ = (float) bitmap.getWidth() / (float) destX;
                dy_ = (float) bitmap.getHeight() / (float) destY;
        }
        else
        {
                dx_ = 1;
                dy_ = 1;
        }
        width_ = 3 * bitmap.getWidth();
        width_   = (width_ + 3) & ~3;   

        reset();
}

ImageItterator::~ImageItterator()
{

}

void ImageItterator::reset()
{
        posX_ = posY_ = 0.0f;
        pos_ = bitmap_.getBits();
}

void ImageItterator::incX()
{
        posX_ += dx_;
        if (posX_ >= bitmap_.getWidth()) posX_ = 0.0f;
}

void ImageItterator::incY()
{
        posX_ = 0.0f;
        posY_ += dy_;
        if (posY_ >= bitmap_.getHeight()) posY_ = 0.0f;
        pos_ = (unsigned char *) (bitmap_.getBits() + ((int) posY_  * width_));
}

unsigned char *ImageItterator::getPos()
{
        return pos_ + (int) posX_ * 3;
}

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