Image.cpp

Go to the documentation of this file.

/*
--------------------------------------------------------------------------------
This source file is part of Hydrax.
Visit ---
 
Copyright (C) 2008 Xavier Verguín González <xavierverguin@hotmail.com>
                                           <xavyiy@gmail.com>
 
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser 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 Lesser General Public License for more details.
 
You should have received a copy of the GNU Lesser General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA, or go to
http://www.gnu.org/copyleft/lesser.txt.
--------------------------------------------------------------------------------
*/
 
#include <Image.h>
 
namespace Hydrax
{
    Image::Image(const Size &Size)
        : mSize(Hydrax::Size(Size.Width+1,Size.Height+1))
        , mChannels(static_cast<int>(TYPE_RGBA))
        , mData(0)
    {
        _Initialize(0);
    }
 
    Image::Image(const Size &Size, const Type &Type)
        : mSize(Hydrax::Size(Size.Width+1,Size.Height+1))
        , mChannels(static_cast<int>(Type))
        , mData(0)
    {
        _Initialize(0);
    }
 
    Image::Image(const Size &Size, const Type &Type, const float &v)
        : mSize(Hydrax::Size(Size.Width+1,Size.Height+1))
        , mChannels(static_cast<int>(Type))
        , mData(0)
    {
        _Initialize(v);
    }
 
    Image::~Image()
    {
        delete mData;
    }
 
    const float& Image::getValue(const int &x, const int &y, const int &c) const
    {
#if HYDRAX_IMAGE_CHECK_PIXELS == 1
        if (c < 0 || c > mChannels ||
            x < 0 || x > mSize.Width ||
            y < 0 || y > mSize.Height)
        {
            HydraxLOG("Error in Image::getValue, x = " + Ogre::StringConverter::toString(x)
                                             + " y = " + Ogre::StringConverter::toString(y)
                                             + " Channel = " + Ogre::StringConverter::toString(c));
 
            return 0;
        }
#endif
 
        return mData[(y*mSize.Width+x)*mChannels+c];
    }
 
    float Image::getValueLI(const float &x, const float &y, const int &c) const
    {
#if HYDRAX_IMAGE_CHECK_PIXELS == 1
        if (c < 0 || c > mChannels ||
            x < 0 || x > mSize.Width ||
            y < 0 || y > mSize.Height)
        {
            HydraxLOG("Error in Image::getValue, x = " + Ogre::StringConverter::toString(x)
                                             + " y = " + Ogre::StringConverter::toString(y)
                                             + " Channel = " + Ogre::StringConverter::toString(c));
 
            return 0;
        }
#endif
 
        int xINT = static_cast<int>(x),
            yINT = static_cast<int>(y);
 
        float xDIFF = x-xINT,
              yDIFF = y-yINT,
              _xDIFF = 1-xDIFF,
              _yDIFF = 1-yDIFF;
 
        //   A      B
        //
        //
        //   C      D
        float A = mData[(yINT*mSize.Width+xINT)*mChannels+c],
              B = mData[(yINT*mSize.Width+xINT+1)*mChannels+c],
              C = mData[((yINT+1)*mSize.Width+xINT)*mChannels+c],
              D = mData[((yINT+1)*mSize.Width+xINT+1)*mChannels+c];
 
        return A*_xDIFF*_yDIFF +
               B* xDIFF*_yDIFF +
               C*_xDIFF* yDIFF +
               D* xDIFF* yDIFF;
    }
 
    Image::Pixel Image::getPixel(const int &x, const int &y) const
    {
#if HYDRAX_IMAGE_CHECK_PIXELS == 1
        if (x < 0 || x > mSize.Width ||
            y < 0 || y > mSize.Height)
        {
            HydraxLOG("Error in Image::getPixel, x = " + Ogre::StringConverter::toString(x)
                                             + " y = " + Ogre::StringConverter::toString(y));
 
            return Pixel(0);
        }
#endif
 
        float v[4];
 
        for(int k = 0; k < 4; k++)
        {
            if (mChannels >= k)
            {
                v[k] = getValue(x, y, k);
            }
            else
            {
                v[k] = 0;
            }
        }
 
        return Pixel(v[0], v[1], v[2], v[3]);
    }
 
    Image::Pixel Image::getPixelLI(const float &x, const float &y) const
    {
#if HYDRAX_IMAGE_CHECK_PIXELS == 1
        if (x < 0 || x > mSize.Width ||
            y < 0 || y > mSize.Height)
        {
            HydraxLOG("Error in Image::getPixel, x = " + Ogre::StringConverter::toString(x)
                                             + " y = " + Ogre::StringConverter::toString(y));
 
            return Pixel(0);
        }
#endif
 
        float v[4];
 
        for(int k = 0; k < 4; k++)
        {
            if (mChannels >= k)
            {
                v[k] = getValueLI(x, y, k);
            }
            else
            {
                v[k] = 0;
            }
        }
 
        return Pixel(v[0], v[1], v[2], v[3]);
    }
 
    void Image::setValue(const int &x, const int &y, const int &c, const float &v)
    {
#if HYDRAX_IMAGE_CHECK_PIXELS == 1
        if (c < 0 || c > mChannels   ||
            x < 0 || x > mSize.Width ||
            y < 0 || y > mSize.Height)
        {
            HydraxLOG("Error in Image::setValue, x = " + Ogre::StringConverter::toString(x)
                                             + " y = " + Ogre::StringConverter::toString(y)
                                             + " Channel = " + Ogre::StringConverter::toString(c));
 
            return;
        }
#endif
 
        mData[(y*mSize.Width+x)*mChannels+c] = v;
    }
 
    void Image::setPixel(const int &x, const int &y, const Pixel &p)
    {
#if HYDRAX_IMAGE_CHECK_PIXELS == 1
        if (x < 0 || x > mSize.Width ||
            y < 0 || y > mSize.Height)
        {
            HydraxLOG("Error in Image::setPixel, x = " + Ogre::StringConverter::toString(x)
                                             + " y = " + Ogre::StringConverter::toString(y));
 
            return;
        }
#endif
 
        switch(mChannels)
        {
            case 1:
            {
                setValue(x, y, 0, p.red);
            }
            break;
 
            case 2:
            {
                setValue(x, y, 0, p.red);
                setValue(x, y, 1, p.green);
            }
            break;
 
            case 3:
            {
                setValue(x, y, 0, p.red);
                setValue(x, y, 1, p.green);
                setValue(x, y, 2, p.blue);
            }
            break;
 
            case 4:
            {
                setValue(x, y, 0, p.red);
                setValue(x, y, 1, p.green);
                setValue(x, y, 2, p.blue);
                setValue(x, y, 3, p.alpha);
            }
            break;
        }
    }
 
    void Image::_Initialize(const float &v)
    {
        mData = new float[(mSize.Width)  *
                          (mSize.Height) *
                          mChannels];
 
        int x,y,c;
 
        for (x = 0; x < mSize.Width; x++)
        {
            for (y = 0; y < mSize.Height; y++)
            {
                for(c = 0; c < mChannels; c++)
                {
                    mData[(y*mSize.Width+x)*mChannels+c] = v;
                }
            }
        }
    }
}