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

//

// Copyright (c) 2003-2012, Industrial Light & Magic, a division of Lucasfilm

// Entertainment Company Ltd.  Portions contributed and copyright held by

// others as indicated.  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

//       any other contributors to this software may be used to endorse or

//       promote products derived from this software without specific prior

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//

// 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

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//

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

#include <ImfOutputFile.h>

#include <ImfInputFile.h>

#include <ImfTiledOutputFile.h>

#include <ImfTiledInputFile.h>

#include <ImfChannelList.h>

#include <ImfArray.h>

#include <ImfConvert.h>

#include <half.h>

#include "compareFloat.h"

#include <stdio.h>

#include <assert.h>

namespace IMF = OPENEXR_IMF_NAMESPACE;

using namespace IMF;

using namespace std;

using namespace IMATH_NAMESPACE;

namespace {

//

// Functions to test conversion of individual numbers

//

void

testFloatToUint (unsigned int floatVal, unsigned int uintVal)

{

    union {unsigned int ui; float f;} u;

    u.ui = floatVal;

    cout << "floatToUint (" << u.f << ") == " << floatToUint(u.f) << endl;

    assert (floatToUint (u.f) == uintVal);

}

void

testHalfToUint (unsigned int halfVal, unsigned int uintVal)

{

    half h;

    h.setBits (halfVal);

    cout << "halfToUint (" << h << ") == " << halfToUint(h) << endl;

    assert (halfToUint (h) == uintVal);

}

void

testFloatToHalf (unsigned int floatVal, unsigned int halfVal)

{

    union {unsigned int ui; float f;} u;

    u.ui = floatVal;

    cout << "floatToHalf (" << u.f << ") == " << floatToHalf(u.f) << endl;

    assert (floatToHalf(u.f).bits() == halfVal);

}

void

testUintToHalf (unsigned int uintVal, unsigned int halfVal)

{

    cout << "uintToHalf (" << uintVal << ") == " << uintToHalf(uintVal) << endl;

    assert (uintToHalf(uintVal).bits() == halfVal);

}

void

testNumbers ()

{

    testFloatToUint (0x00000000, 0);		//  0.0

    testFloatToUint (0x3f000000, 0);		// +0.5

    testFloatToUint (0xbf000000, 0);		// -0.5

    testFloatToUint (0x42f82000, 124);		// +124.0625

    testFloatToUint (0xc2f82000, 0);		// -124.0625

    testFloatToUint (0x58635fa9, 0xffffffff);	// +1.0e15

    testFloatToUint (0xd8635fa9, 0);		// -1.0e15

    testFloatToUint (0x7f800000, 0xffffffff);	// +infinity

    testFloatToUint (0xff800000, 0);		// -infinity

    testFloatToUint (0x7fffffff, 0);		//  NaN

    testFloatToUint (0xffffffff, 0);		//  NaN

    testHalfToUint  (0x0000, 0);		//  0.0

    testHalfToUint  (0x3800, 0);		// +0.5

    testHalfToUint  (0xb800, 0);		// -0.5

    testHalfToUint  (0x57c1, 124);		// +124.0625

    testHalfToUint  (0xd7c1, 0);		// -124.0625

    testHalfToUint  (0x7c00, 0xffffffff);	// +infinity

    testHalfToUint  (0xfc00, 0);		// -infinity

    testHalfToUint  (0x7fff, 0);		//  NaN

    testHalfToUint  (0xffff, 0);		//  NaN

    testFloatToHalf (0x00000000, 0x0000);	//  0.0

    testFloatToHalf (0x3f000000, 0x3800);	// +0.5

    testFloatToHalf (0xbf000000, 0xb800);	// -0.5

    testFloatToHalf (0x42f82000, 0x57c1);	// +124.0625

    testFloatToHalf (0xc2f82000, 0xd7c1);	// -124.0625

    testFloatToHalf (0x58635fa9, 0x7c00);	// +1.0e15

    testFloatToHalf (0xd8635fa9, 0xfc00);	// -1.0e15

    testFloatToHalf (0x7f800000, 0x7c00);	// +infinity

    testFloatToHalf (0xff800000, 0xfc00);	// -infinity

    testFloatToHalf (0x7fffffff, 0x7fff);	//  NaN

    testFloatToHalf (0xffffffff, 0xffff);	//  NaN

    testUintToHalf  (0,          0x0000);	

    testUintToHalf  (1,          0x3c00);

    testUintToHalf  (124,        0x57c0);

    testUintToHalf  (1000000,    0x7c00);

    testUintToHalf  (0xffffffff, 0x7c00);

}

template <class T>

bool

isEquivalent (T t1, T t2, Compression compression)

{

    return t1 == t2;

}

template<>

bool

isEquivalent (float t1, float t2, Compression compression)

{

    return equivalent (t1, t2, compression);

}

template 

          class InType,  PixelType InTypeTag>

void

testScanLineImageChannel (const char fileName[],

		          int width, int height,

			  Compression compression)

{

    cout << "scan lines, "

	    "compression " << compression << ", " <<

	    "output type " << OutTypeTag << ", " <<

	    "input type " << InTypeTag << ":\n    " << flush;

    Array2D<OutType> outPixels (height, width);

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

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

	    outPixels[y][x] = x * 10 + y;

    {

	Header hdr (width, height);

	hdr.compression() = compression;

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

			       Channel (OutTypeTag));		// type

	FrameBuffer fb;

	fb.insert ("X",						// name

		   Slice (OutTypeTag,				// type

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

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

			  sizeof (outPixels[0][0]) * width));	// yStride

	cout << "writing " << flush;

	OutputFile out (fileName, hdr);

	out.setFrameBuffer (fb);

	out.writePixels (height);

    }

    Array2D<InType> inPixels (height, width);

    {

	cout << "reading " << flush;

	FrameBuffer fb;

	fb.insert ("X",						// name

		   Slice (InTypeTag,				// type

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

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

			  sizeof (inPixels[0][0]) * width));	// yStride

	InputFile in (fileName);

	in.setFrameBuffer (fb);

	in.readPixels (0, height - 1);

    }

    cout << "comparing" << flush;

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

    {

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

	{

	    assert (isEquivalent (inPixels[y][x],

				  InType (outPixels[y][x]),

				  compression));

	}

    }

    cout << endl;

    remove (fileName);

}

template 

          class InType,  PixelType InTypeTag>

void

testTiledImageChannel (const char fileName[],

		       int width, int height,

		       Compression compression)

{

    cout << "tiles, "

	    "compression " << compression << ", " <<

	    "output type " << OutTypeTag << ", " <<

	    "input type " << InTypeTag << ":\n    " << flush;

    Array2D<OutType> outPixels (height, width);

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

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

	    outPixels[y][x] = x * 10 + y;

    {

	Header hdr (width, height);

	hdr.setTileDescription (TileDescription (67, 67, ONE_LEVEL));

	hdr.compression() = compression;

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

			       Channel (OutTypeTag));		// type

	FrameBuffer fb;

	fb.insert ("X",						// name

		   Slice (OutTypeTag,				// type

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

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

			  sizeof (outPixels[0][0]) * width));	// yStride

	cout << "writing " << flush;

	TiledOutputFile out (fileName, hdr);

	out.setFrameBuffer (fb);

        out.writeTiles (0, out.numXTiles() - 1, 0, out.numYTiles() - 1);

    }

    Array2D<InType> inPixels (height, width);

    {

	cout << "reading " << flush;

	FrameBuffer fb;

	fb.insert ("X",						// name

		   Slice (InTypeTag,				// type

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

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

			  sizeof (inPixels[0][0]) * width));	// yStride

	TiledInputFile in (fileName);

	in.setFrameBuffer (fb);

        in.readTiles (0, in.numXTiles() - 1, 0, in.numYTiles() - 1);

    }

    cout << "comparing" << flush;

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

    {

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

	{

	    assert (isEquivalent (inPixels[y][x],

				  InType (outPixels[y][x]),

				  compression));

	}

    }

    cout << endl;

    remove (fileName);

}

template 

          class InType,  PixelType InTypeTag>

void

testImageChannel (const std::string &fileName,

		  int width, int height,

		  Compression compression)

{

    testScanLineImageChannel <OutType, OutTypeTag, InType, InTypeTag>

	(fileName.c_str(), width, height, compression);

    testTiledImageChannel <OutType, OutTypeTag, InType, InTypeTag>

	(fileName.c_str(), width, height, compression);

}

} // namespace

void

testConversion (const std::string &tempDir)

{

    try

    {

	cout << "Testing conversion between pixel data types" << endl;

	cout << "individual numbers" << endl;

	testNumbers();

	cout << "conversion of image channels while reading a file " << endl;

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

	{

	    if (comp == B44_COMPRESSION ||

                comp == B44A_COMPRESSION)

            {

		continue;

            }

	    testImageChannel <unsigned int, IMF::UINT, unsigned int, IMF::UINT>

			     (tempDir + "imf_test_conv.exr",

			      317, 539,

			      Compression (comp));

	    testImageChannel <unsigned int, IMF::UINT, half, IMF::HALF>

			     (tempDir + "imf_test_conv.exr",

			      317, 539,

			      Compression (comp));

	    testImageChannel <unsigned int, IMF::UINT, float, IMF::FLOAT>

			     (tempDir + "imf_test_conv.exr",

			      317, 539,

			      Compression (comp));

	    testImageChannel <half, IMF::HALF, unsigned int, IMF::UINT>

			     (tempDir + "imf_test_conv.exr",

			      317, 539,

			      Compression (comp));

	    testImageChannel <half, IMF::HALF, half, IMF::HALF>

			     (tempDir + "imf_test_conv.exr",

			      317, 539,

			      Compression (comp));

	    testImageChannel <half, IMF::HALF, float, IMF::FLOAT>

			     (tempDir + "imf_test_conv.exr",

			      317, 539,

			      Compression (comp));

	    testImageChannel <float, IMF::FLOAT, unsigned int, IMF::UINT>

			     (tempDir + "imf_test_conv.exr",

			      317, 539,

			      Compression (comp));

	    testImageChannel <float, IMF::FLOAT, half, IMF::HALF>

			     (tempDir + "imf_test_conv.exr",

			      317, 539,

			      Compression (comp));

	    testImageChannel <float, IMF::FLOAT, float, IMF::FLOAT>

			     (tempDir + "imf_test_conv.exr",

			      317, 539,

			      Compression (comp));

	}

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

    }

    catch (const std::exception &e)

    {

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

	assert (false);

    }

}