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

//

// 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

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

// distribution.

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// from this software without specific prior written permission. 

// 

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

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

#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> &ph, int width, int height)

{

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

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

	    ph[y][x] = sin (double (x)) + sin (y * 0.5);

}

void

writeCopyRead (const Array2D<half> &ph1,

	       const char fileName1[],

	       const char fileName2[],

	       int width,

	       int height,

	       int xOffset,

	       int yOffset,

	       Compression comp)

{

    //

    // Write the pixel data in ph1 to an image file using the

    // specified compression type and subsampling rates.

    // Then copy the image file using OutputFile::copyPixels()

    // Read the pixel data back from the copied file verify

    // that the data are the same as those in ph1.

    //

    cout << "compression " << comp << ":" << flush;

    Header hdr ((Box2i (V2i (0, 0),			// display window

		        V2i (width - 1, height -1))),

		(Box2i (V2i (xOffset, yOffset),		// data window

		        V2i (xOffset + width - 1, yOffset + height - 1))));

    hdr.compression() = comp;

    hdr.channels().insert ("H", Channel (HALF, 1, 1));

    {

	FrameBuffer fb; 

	fb.insert ("H",						// name

		   Slice (HALF,					// type

			  (char *) &ph1[-yOffset][-xOffset],	// base

			  sizeof (ph1[0][0]), 			// xStride

			  sizeof (ph1[0][0]) * width,		// yStride

			  1,					// xSampling

			  1)					// ySampling

		  );

	cout << " writing" << flush;

	remove (fileName1);

	OutputFile out (fileName1, hdr);

	out.setFrameBuffer (fb);

	out.writePixels (height);

    }

    {

	cout << " copying" << flush;

	remove (fileName2);

	InputFile in (fileName1);

	OutputFile out (fileName2, in.header());

	out.copyPixels (in);

    }

    {

	cout << " reading" << flush;

	InputFile in1 (fileName1);

	InputFile in2 (fileName2);

	const Box2i &dw = in2.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> ph1 (h, w);

	Array2D<half> ph2 (h, w);

	FrameBuffer fb1;

	FrameBuffer fb2;

	fb1.insert ("H",				// name

		    Slice (HALF,			// type

			   (char *) &ph1[-dy][-dx],	// base

			   sizeof (ph1[0][0]), 		// xStride

			   sizeof (ph1[0][0]) * w,	// yStride

			   1,				// xSampling

			   1)				// ySampling

		   );

	fb2.insert ("H",				// name

		    Slice (HALF,			// type

			   (char *) &ph2[-dy][-dx],	// base

			   sizeof (ph2[0][0]), 		// xStride

			   sizeof (ph2[0][0]) * w,	// yStride

			   1,				// xSampling

			   1)				// ySampling

		   );

	in1.setFrameBuffer (fb1);

	in1.readPixels (dw.min.y, dw.max.y);

	in2.setFrameBuffer (fb2);

	in2.readPixels (dw.min.y, dw.max.y);

	cout << " comparing" << flush;

	assert (in2.header().displayWindow() == hdr.displayWindow());

	assert (in2.header().dataWindow() == hdr.dataWindow());

	assert (in2.header().pixelAspectRatio() == hdr.pixelAspectRatio());

	assert (in2.header().screenWindowCenter() == hdr.screenWindowCenter());

	assert (in2.header().screenWindowWidth() == hdr.screenWindowWidth());

	assert (in2.header().lineOrder() == hdr.lineOrder());

	assert (in2.header().compression() == hdr.compression());

	assert (in2.header().channels() == hdr.channels());

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

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

		assert (ph1[y][x] == ph2[y][x]);

    }

    remove (fileName1);

    remove (fileName2);

    cout << endl;

}

void

writeCopyRead (const std::string &tempDir, const Array2D<half> &ph, int w, int h, int dx, int dy)

{

    std::string filename1 = tempDir + "imf_test_copy1.exr";

    std::string filename2 = tempDir + "imf_test_copy2.exr";

    for (int comp = 0; comp < NUM_COMPRESSION_METHODS; ++comp)

    {

	writeCopyRead (ph,

		       filename1.c_str(),

		       filename2.c_str(),

		       w, h,

		       dx, dy,

		       Compression (comp));

    }

}

} // namespace

void

testCopyPixels (const std::string &tempDir)

{

    try

    {

	cout << "Testing fast pixel copying" << endl;

	const int W = 371;

	const int H = 559;

	const int DX = 17;

	const int DY = 29;

	Array2D<half> ph (H, W);

	fillPixels (ph, W, H);

	writeCopyRead (tempDir, ph, W, H, 0,  0);

	writeCopyRead (tempDir, ph, W, H, 0,  DY);

	writeCopyRead (tempDir, ph, W, H, DX, 0);

	writeCopyRead (tempDir, ph, W, H, DX, DY);

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

    }

    catch (const std::exception &e)

    {

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

	assert (false);

    }

}