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//
// Copyright (c) 2002-2012, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
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#include <ImfWav.h>
#include "ImathRandom.h"
#include <ImfArray.h>
#include <iostream>
#include <exception>
#include <stdlib.h>
#include <assert.h>


using namespace OPENEXR_IMF_NAMESPACE;
using namespace std;


namespace {


void
fill1_14bit (Array2D <unsigned short> &a,
             Array2D <unsigned short> &b,
             int nx,
             int ny,
	     IMATH_NAMESPACE::Rand48 & rand48)
{
    for (int y = 0; y < ny; ++y)
	for (int x = 0; x < nx; ++x)
	    a[y][x] = b[y][x] = rand48.nexti() & 0x3fff;
}


void
fill1_16bit (Array2D <unsigned short> &a,
             Array2D <unsigned short> &b,
             int nx,
             int ny,
	     IMATH_NAMESPACE::Rand48 & rand48)
{
    for (int y = 0; y < ny; ++y)
	for (int x = 0; x < nx; ++x)
	    a[y][x] = b[y][x] = rand48.nexti() & 0xffff;
}


void
fill2 (Array2D <unsigned short> &a,
       Array2D <unsigned short> &b,
       int nx,
       int ny,
       unsigned short v)
{
    for (int y = 0; y < ny; ++y)
	for (int x = 0; x < nx; ++x)
	    a[y][x] = b[y][x] = v;
}


void
fill3_14bit (Array2D <unsigned short> &a,
             Array2D <unsigned short> &b,
             int nx,
             int ny)
{
    for (int y = 0; y < ny; ++y)
	for (int x = 0; x < nx; ++x)
	    a[y][x] = b[y][x] = (x & 1)? 0: 0x3fff;
}


void
fill3_16bit (Array2D <unsigned short> &a,
          Array2D <unsigned short> &b,
          int nx,
          int ny)
{
    for (int y = 0; y < ny; ++y)
	for (int x = 0; x < nx; ++x)
	    a[y][x] = b[y][x] = (x & 1)? 0: 0xffff;
}


void
fill4_14bit (Array2D <unsigned short> &a,
             Array2D <unsigned short> &b,
             int nx,
             int ny)
{
    for (int y = 0; y < ny; ++y)
	for (int x = 0; x < nx; ++x)
	    a[y][x] = b[y][x] = (y & 1)? 0: 0x3fff;
}


void
fill4_16bit (Array2D <unsigned short> &a,
             Array2D <unsigned short> &b,
             int nx,
             int ny)
{
    for (int y = 0; y < ny; ++y)
	for (int x = 0; x < nx; ++x)
	    a[y][x] = b[y][x] = (y & 1)? 0: 0xffff;
}


void
fill5_14bit (Array2D <unsigned short> &a,
             Array2D <unsigned short> &b,
             int nx,
             int ny)
{
    for (int y = 0; y < ny; ++y)
	for (int x = 0; x < nx; ++x)
	    a[y][x] = b[y][x] = ((x + y) & 1)? 0: 0x3fff;
}


void
fill5_16bit (Array2D <unsigned short> &a,
             Array2D <unsigned short> &b,
             int nx,
             int ny)
{
    for (int y = 0; y < ny; ++y)
	for (int x = 0; x < nx; ++x)
	    a[y][x] = b[y][x] = ((x + y) & 1)? 0: 0xffff;
}


unsigned short
maxValue (const Array2D <unsigned short> &a, int nx, int ny)
{
    unsigned short mx = 0;

    for (int y = 0; y < ny; ++y)
	for (int x = 0; x < nx; ++x)
	    if (mx < a[y][x])
		mx = a[y][x];

    // cout << "max value = " << mx << endl;

    return mx;
}


void
wavEncodeDecode (Array2D <unsigned short> &a,
		 const Array2D <unsigned short> &b,
		 int nx,
		 int ny)
{
    unsigned short mx = maxValue (a, nx, ny);

    //cout << "encoding " << flush;

    wav2Encode (&a[0][0], nx, 1, ny, nx, mx);

    //cout << "decoding " << flush;

    wav2Decode (&a[0][0], nx, 1, ny, nx, mx);

    //cout << "comparing" << endl;

    for (int y = 0; y < ny; ++y)
    {
	for (int x = 0; x < nx; ++x)
	{
	    //cout << x << ' ' << y << ' ' << a[y][x] << ' ' << b[y][x] << endl;
	    assert (a[y][x] == b[y][x]);
	}
    }
}


void
test (int nx, int ny)
{
    cout << nx << " x " << ny << endl;

    Array2D<unsigned short> a (ny, nx);
    Array2D<unsigned short> b (ny, nx);

    IMATH_NAMESPACE::Rand48 rand48 (0);

    fill1_14bit (a, b, nx, ny, rand48);
    wavEncodeDecode (a, b, nx, ny);

    fill1_16bit (a, b, nx, ny, rand48);
    wavEncodeDecode (a, b, nx, ny);

    fill2 (a, b, nx, ny, 0);
    wavEncodeDecode (a, b, nx, ny);

    fill2 (a, b, nx, ny, 1);
    wavEncodeDecode (a, b, nx, ny);

    fill2 (a, b, nx, ny, 0x3ffe);
    wavEncodeDecode (a, b, nx, ny);

    fill2 (a, b, nx, ny, 0x3fff);
    wavEncodeDecode (a, b, nx, ny);

    fill2 (a, b, nx, ny, 0xfffe);
    wavEncodeDecode (a, b, nx, ny);

    fill2 (a, b, nx, ny, 0xffff);
    wavEncodeDecode (a, b, nx, ny);

    fill3_14bit (a, b, nx, ny);
    wavEncodeDecode (a, b, nx, ny);

    fill3_16bit (a, b, nx, ny);
    wavEncodeDecode (a, b, nx, ny);

    fill4_14bit (a, b, nx, ny);
    wavEncodeDecode (a, b, nx, ny);

    fill4_16bit (a, b, nx, ny);
    wavEncodeDecode (a, b, nx, ny);

    fill5_14bit (a, b, nx, ny);
    wavEncodeDecode (a, b, nx, ny);

    fill5_16bit (a, b, nx, ny);
    wavEncodeDecode (a, b, nx, ny);
}

} // namespace


void
testWav (const std::string&)
{
    try
    {
	cout << "Testing Wavelet encoder" << endl;
	
	test (1, 1);
	test (2, 2);
	test (32, 32);
	test (1024, 16);
	test (16, 1024);
	test (997, 37);
	test (37, 997);
	test (1024, 1024);
	test (997, 997);

	cout << "ok\n" << endl;
    }
    catch (const std::exception &e)
    {
	cerr << "ERROR -- caught exception: " << e.what() << endl;
	assert (false);
    }
}
