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

//

// Copyright (c) 2002-2012, 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

// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

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

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

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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

//

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

#include <ImfOutputFile.h>

#include <ImfInputFile.h>

#include <ImfChannelList.h>

#include <ImfArray.h>

#include "half.h"

#include <stdio.h>

#include <assert.h>

using namespace OPENEXR_IMF_NAMESPACE;

using namespace std;

using namespace IMATH_NAMESPACE;

namespace {

void

fillPixels (Array2D<half> &ph1,

	    Array2D<half> &ph2,

	    int width, int height)

{

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

    {

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

	{

	    ph1[y][x] = x % 10 + 10 * (y % 17);

	    ph2[y][x] = x % 11 + 11 * (y % 15);

	}

    }

}

void

writeRead (const Array2D<half> &h1out,

	   const Array2D<half> &h2out,

	   const char fileName[],

	   int width,

	   int height)

{

    //

    // Write an image file with three channels, H1, H2 and H3.

    // Our frame buffer contains pixel data only for H1 and H2;

    // the file's H3 channel should be filled with zeroes.

    //

    Header hdr (width, height);

    hdr.channels().insert ("H1",			// name

			   Channel (HALF,		// type

				    1,			// xSampling

				    1)			// ySampling

			  );

    hdr.channels().insert ("H2",			// name

			   Channel (HALF,		// type

				    1,			// xSampling

				    1)			// ySampling

			  );

    hdr.channels().insert ("H3",			// name

			   Channel (HALF,		// type

				    1,			// xSampling

				    1)			// ySampling

			  );

    {

	FrameBuffer fb; 

	fb.insert ("H1",				// name

		   Slice (HALF,				// type

			  (char *) &h1out[0][0],	// base

			  sizeof (h1out[0][0]), 	// xStride

			  sizeof (h1out[0][0]) * width,	// yStride

			  1,				// xSampling

			  1)				// ySampling

		  );

	fb.insert ("H2",				// name

		   Slice (HALF,				// type

			  (char *) &h2out[0][0],	// base

			  sizeof (h2out[0][0]), 	// xStride

			  sizeof (h2out[0][0]) * width,	// yStride

			  1,				// xSampling

			  1)				// ySampling

		  );

	cout << "writing" << flush;

	remove (fileName);

	OutputFile out (fileName, hdr);

	out.setFrameBuffer (fb);

	out.writePixels (height);

    }

    //

    // Read the image back from the file.  Our frame buffer now

    // contains space for the three channels, H1, H3 and H4.

    // H1 and H3 should be read back from the file (but H3

    // should contain only zeroes), and H4 should be filled

    // with a default value, 3.0, because the file contains

    // no data for it.  The file's H2 channel should be ignored.

    //

    {

	cout << " reading" << flush;

	InputFile in (fileName);

	const Box2i &dw = in.header().dataWindow();

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

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

	int dx = dw.min.x;

	int dy = dw.min.y;

	Array2D<half> h1in (h, w);

	Array2D<half> h3in (h, w);

	Array2D<half> h4in (h, w);

	FrameBuffer fb;

	fb.insert ("H1",				// name

		   Slice (HALF,				// type

			  (char *) &h1in[-dy][-dx],	// base

			  sizeof (h1in[0][0]), 		// xStride

			  sizeof (h1in[0][0]) * w,	// yStride

			  1,				// xSampling

			  1,				// ySampling

			  3.0)				// fillValue

		  );

	fb.insert ("H3",				// name

		   Slice (HALF,				// type

			  (char *) &h3in[-dy][-dx],	// base

			  sizeof (h3in[0][0]), 		// xStride

			  sizeof (h3in[0][0]) * w,	// yStride

			  1,				// xSampling

			  1,				// ySampling

			  3.0)				// fillValue

		  );

	fb.insert ("H4",				// name

		   Slice (HALF,				// type

			  (char *) &h4in[-dy][-dx],	// base

			  sizeof (h4in[0][0]), 		// xStride

			  sizeof (h4in[0][0]) * w,	// yStride

			  1,				// xSampling

			  1,				// ySampling

			  3.0)				// fillValue

		  );

	in.setFrameBuffer (fb);

	in.readPixels (dw.min.y, dw.max.y);

	cout << " comparing" << flush;

	assert (in.header().displayWindow() == hdr.displayWindow());

	assert (in.header().dataWindow() == hdr.dataWindow());

	assert (in.header().pixelAspectRatio() == hdr.pixelAspectRatio());

	assert (in.header().screenWindowCenter() == hdr.screenWindowCenter());

	assert (in.header().screenWindowWidth() == hdr.screenWindowWidth());

	assert (in.header().lineOrder() == hdr.lineOrder());

	assert (in.header().compression() == hdr.compression());

	ChannelList::ConstIterator hi = hdr.channels().begin();

	ChannelList::ConstIterator ii = in.header().channels().begin();

	while (hi != hdr.channels().end())

	{

	    assert (!strcmp (hi.name(), ii.name()));

	    assert (hi.channel().type == ii.channel().type);

	    assert (hi.channel().xSampling == ii.channel().xSampling);

	    assert (hi.channel().ySampling == ii.channel().ySampling);

	    ++hi;

	    ++ii;

	}

	assert (ii == in.header().channels().end());

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

	{

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

	    {

		assert (h1in[y][x] == h1out[y][x]);

		assert (h3in[y][x] == 0.0);

		assert (h4in[y][x] == 3.0);

	    }

	}

    }

    remove (fileName);

    cout << endl;

}

} // namespace

void

testChannels (const std::string &tempDir)

{

    try

    {

	cout << "Testing filling of missing channels" << endl;

	const int W = 117;

	const int H = 97;

	Array2D<half> ph1 (H, W);

	Array2D<half> ph2 (H, W);

	fillPixels (ph1, ph2, W, H);

	std::string filename = tempDir + "imf_test_channels.exr";

	writeRead (ph1, ph2, filename.c_str(), W, H);

	cout << "ok\n" << endl;

    }

    catch (const std::exception &e)

    {

	cerr << "ERROR -- caught exception: " << e.what() << endl;

	assert (false);

    }

}