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

//

// Copyright (c) 2007, 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

// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

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//

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

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

//

//	resizeLatLong(), resizeCube() -- functions that resample

//	an environment map and convert it to latitude-longitude or

//	cube-face format.

//

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

#include <resizeImage.h>

#include "Iex.h"

#include <string.h>

#include "namespaceAlias.h"

using namespace IMF;

using namespace std;

using namespace IMATH;

void

resizeLatLong (const EnvmapImage &image1,

	       EnvmapImage &image2,

	       const Box2i &image2DataWindow,

	       float filterRadius,

	       int numSamples)

{

    int w = image2DataWindow.max.x - image2DataWindow.min.x + 1;

    int h = image2DataWindow.max.y - image2DataWindow.min.y + 1;

    float radius = 0.5f * 2 * M_PI * filterRadius / w;

    image2.resize (ENVMAP_LATLONG, image2DataWindow);

    image2.clear ();

    Array2D<Rgba> &pixels = image2.pixels();

    for (int y = 0; y < h; ++y)

    {

	for (int x = 0; x < w; ++x)

	{

	    V3f dir = LatLongMap::direction (image2DataWindow, V2f (x, y));

	    pixels[y][x] = image1.filteredLookup (dir, radius, numSamples);

	}

    }

}

void

resizeCube (const EnvmapImage &image1,

	    EnvmapImage &image2,

	    const Box2i &image2DataWindow,

	    float filterRadius,

	    int numSamples)

{

    if (image1.type() == ENVMAP_CUBE && image1.dataWindow() == image2DataWindow)

    {

        //

        // Special case - the input image is a cube-face environment

        // map with the same size as the output image.  We can copy

        // the input image without resampling.

        // 

        image2.resize (ENVMAP_CUBE, image2DataWindow);

        int w = image2DataWindow.max.x - image2DataWindow.min.x + 1;

        int h = image2DataWindow.max.y - image2DataWindow.min.y + 1;

        memcpy (&(image2.pixels()[0][0]),

                &(image1.pixels()[0][0]),

                sizeof (Rgba) * w * h);

        return;

    }

    //

    // Resampe the input image

    //

    int sof = CubeMap::sizeOfFace (image2DataWindow);

    float radius = 1.5f * filterRadius / sof;

    image2.resize (ENVMAP_CUBE, image2DataWindow);

    image2.clear ();

    Array2D<Rgba> &pixels = image2.pixels();

    for (int f = CUBEFACE_POS_X; f <= CUBEFACE_NEG_Z; ++f)

    {

	CubeMapFace face = CubeMapFace (f);

	for (int y = 0; y < sof; ++y)

	{

	    for (int x = 0; x < sof; ++x)

	    {

		V2f posInFace (x, y);

		V3f dir =

		    CubeMap::direction (face, image2DataWindow, posInFace);

		V2f pos =

		    CubeMap::pixelPosition (face, image2DataWindow, posInFace);

		pixels[int (pos.y + 0.5f)][int (pos.x + 0.5f)] =

		    image1.filteredLookup (dir, radius, numSamples);

	    }

	}

    }

}