///////////////////////////////////////////////////////////////////////////

//

// Copyright (c) 2014, Industrial Light & Magic, a division of Lucas

// Digital Ltd. LLC

// 

// All rights reserved.

// 

// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are

// met:

// *       Redistributions of source code must retain the above copyright

// notice, this list of conditions and the following disclaimer.

// *       Redistributions in binary form must reproduce the above

// copyright notice, this list of conditions and the following disclaimer

// in the documentation and/or other materials provided with the

// distribution.

// *       Neither the name of Industrial Light & Magic nor the names of

// its contributors may be used to endorse or promote products derived

// from this software without specific prior written permission. 

// 

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

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///////////////////////////////////////////////////////////////////////////

//----------------------------------------------------------------------------

//

//      class ImageChannel

//

//----------------------------------------------------------------------------

#include "ImfImageChannel.h"

#include "ImfImageLevel.h"

#include <Iex.h>

using namespace IMATH_NAMESPACE;

using namespace IEX_NAMESPACE;

using namespace std;

OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_ENTER

ImageChannel::ImageChannel

    (ImageLevel &level,

     int xSampling,

     int ySampling,

     bool pLinear)

:

    _level (level),

    _xSampling (xSampling),

    _ySampling (ySampling),

    _pLinear (pLinear),

    _pixelsPerRow (0),

    _pixelsPerColumn (0),

    _numPixels (0)

{

    // empty

}

ImageChannel::~ImageChannel ()

{

    // empty

}

Channel

ImageChannel::channel () const

{

    return Channel (pixelType(), xSampling(), ySampling(), pLinear());

}

void

ImageChannel::resize ()

{

    const Box2i& dataWindow = level().dataWindow();

    if (dataWindow.min.x % _xSampling || dataWindow.min.y % _ySampling)

    {

        throw ArgExc ("The minimum x and y coordinates of the data window "

                      "of an image level must be multiples of the x and y "

                      "subsampling factors of all channels in the image.");

    }

    int width =  dataWindow.max.x - dataWindow.min.x + 1;

    int height = dataWindow.max.y - dataWindow.min.y + 1;

    if (width % _xSampling || height % _ySampling)

    {

        throw ArgExc ("The width and height of the data window of an image "

                      "level must be multiples of the x and y subsampling "

                      "factors of all channels in the image.");

    }

    _pixelsPerRow =    width  / _xSampling;

    _pixelsPerColumn = height / _ySampling;

    _numPixels = _pixelsPerRow * _pixelsPerColumn;

}

void

ImageChannel::boundsCheck (int x, int y) const

{

    const Box2i &dataWindow = level().dataWindow();

    if (x < dataWindow.min.x || x > dataWindow.max.x ||

        y < dataWindow.min.y || y > dataWindow.max.y)

    {

        THROW (ArgExc,

               "Attempt to access a pixel at location "

               "(" << x << ", " << y << ") in an image whose data window is "

               "(" << dataWindow.min.x << ", " << dataWindow.min.y << ") - "

               "(" << dataWindow.max.x << ", " << dataWindow.max.y << ").");

    }

    if (x % _xSampling || y % _ySampling)

    {

        THROW (ArgExc,

               "Attempt to access a pixel at location "

               "(" << x << ", " << y << ") in a channel whose x and y sampling "

               "rates are " << _xSampling << " and " << _ySampling << ".  The "

               "pixel coordinates are not divisible by the sampling rates.");

    }

}

OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_EXIT