///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2004-2012, 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. 
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///////////////////////////////////////////////////////////////////////////


#include "compareB44.h"
#include "compareDwa.h"

#include <ImfRgbaFile.h>
#include <ImfArray.h>
#include <string>
#include <stdio.h>
#include <assert.h>
#include <ImathRandom.h>
#include <ImfThreading.h>
#include <IlmThread.h>


using namespace OPENEXR_IMF_NAMESPACE;
using namespace std;
using namespace IMATH_NAMESPACE;


namespace {

Rand32 rand1 (27);

void
fillPixels (Array2D<Rgba> &pixels, int w, int h)
{
    for (int y = 0; y < h; ++y)
    {
	for (int x = 0; x < w; ++x)
	{
	    Rgba &p = pixels[y][x];

	    p.r = 0.5 + 0.5 * sin (0.1 * x + 0.1 * y);
	    p.g = 0.5 + 0.5 * sin (0.1 * x + 0.2 * y);
	    p.b = 0.5 + 0.5 * sin (0.1 * x + 0.3 * y);
	    p.a = (p.r + p.b + p.g) / 3.0;
	}
    }
}


void
writeReadRGBA (const char fileName[],
	       int width,
	       int height,
	       const Array2D<Rgba> &p1,
	       RgbaChannels channels,
	       LineOrder lorder,
	       Compression comp)
{
    //
    // Save the selected channels of RGBA image p1; save the
    // scan lines in the specified order.  Read the image back
    // from the file, and compare the data with the orignal.
    //

    cout << "channels " <<
	    ((channels & WRITE_R)? "R": "") <<
	    ((channels & WRITE_G)? "G": "") <<
	    ((channels & WRITE_B)? "B": "") <<
	    ((channels & WRITE_A)? "A": "") <<
	    ", line order " << lorder <<
	    ", compression " << comp << endl;

    Header header (width, height);
    header.lineOrder() = lorder;
    header.compression() = comp;

    {
	remove (fileName);
	RgbaOutputFile out (fileName, header, channels);
        out.setFrameBuffer (&p1[0][0], 1, width);
        
        int numLeft = height;
        int numWrite = 1;

	//
        // Iterate over all scanlines, and write them out in random-size chunks
	//

        while (numLeft)
        {
            numWrite = int (rand1.nextf() * numLeft + 0.5f);
            out.writePixels (numWrite);
            numLeft -= numWrite;
        }
    }

    {
	RgbaInputFile in (fileName);
	const Box2i &dw = in.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<Rgba> p2 (h, w);
	in.setFrameBuffer (&p2[-dy][-dx], 1, w);
	in.readPixels (dw.min.y, dw.max.y);

	assert (in.displayWindow() == header.displayWindow());
	assert (in.dataWindow() == header.dataWindow());
	assert (in.pixelAspectRatio() == header.pixelAspectRatio());
	assert (in.screenWindowCenter() == header.screenWindowCenter());
	assert (in.screenWindowWidth() == header.screenWindowWidth());
	assert (in.lineOrder() == header.lineOrder());
	assert (in.compression() == header.compression());
	assert (in.channels() == channels);

	if (in.compression() == B44_COMPRESSION ||
	    in.compression() == B44A_COMPRESSION)
	{
	    compareB44 (w, h, p1, p2, channels);
	}
	else if (in.compression() == DWAA_COMPRESSION ||
	         in.compression() == DWAB_COMPRESSION)
	{
	    compareDwa (w, h, p1, p2, channels);
	}
	else
	{
	    for (int y = 0; y < h; ++y)
	    {
		for (int x = 0; x < w; ++x)
		{
		    if (channels & WRITE_R)
			assert (p2[y][x].r == p1[y][x].r);
		    else
			assert (p2[y][x].r == 0);

		    if (channels & WRITE_G)
			assert (p2[y][x].g == p1[y][x].g);
		    else
			assert (p2[y][x].g == 0);

		    if (channels & WRITE_B)
			assert (p2[y][x].b == p1[y][x].b);
		    else
			assert (p2[y][x].b == 0);

		    if (channels & WRITE_A)
			assert (p2[y][x].a == p1[y][x].a);
		    else
			assert (p2[y][x].a == 1);
		}
	    }
	}
    }

    remove (fileName);
}


} // namespace


void
testRgbaThreading (const std::string &tempDir)
{
    try
    {
        cout << "Testing setGlobalThreadCount()" << endl;

        if (!ILMTHREAD_NAMESPACE::supportsThreads ())
        {
            cout << "   Threading not supported!" << endl << endl;
            return;
        }
    
        for (int i = 0; i < 10000; i++)
        {
            int numThreads = int (rand1.nextf() * 32 + 0.5f);
            setGlobalThreadCount (numThreads);
            
            if (i % 2000 == 0)
                cout << "." << flush;
        }

        cout << "\nok\n" << endl;

	cout << "Testing multi-threaded writing of scanlines\n"
		"in random-sized blocks" << endl;

	const int W = 237;
	const int H = 119;

	Array2D<Rgba> p1 (H, W);
	fillPixels (p1, W, H);

        for (int n = 0; n <= 8; n++)
        {
            int numThreads = (n * 3) % 8;

            setGlobalThreadCount (numThreads);
            cout << "number of threads: " << globalThreadCount () << endl;

            for (int comp = 0; comp < NUM_COMPRESSION_METHODS; ++comp)
            {
                for (int lorder = 0; lorder < RANDOM_Y; ++lorder)
                {
                    writeReadRGBA ((tempDir + "imf_test_rgba.exr").c_str(),
                                   W, H, p1,
                                   WRITE_RGBA,
                                   LineOrder (lorder),
                                   Compression (comp));
    
                    writeReadRGBA ((tempDir + "imf_test_rgba.exr").c_str(),
                                   W, H, p1,
                                   WRITE_RGB,
                                   LineOrder (lorder),
                                   Compression (comp));
    
                    writeReadRGBA ((tempDir + "imf_test_rgba.exr").c_str(),
                                   W, H, p1,
                                   WRITE_A,
                                   LineOrder (lorder),
                                   Compression (comp));
    
                    writeReadRGBA ((tempDir + "imf_test_rgba.exr").c_str(),
                                   W, H, p1,
                                   RgbaChannels (WRITE_R | WRITE_B),
                                   LineOrder (lorder),
                                   Compression (comp));
                }
            }
        }
        
	cout << "ok\n" << endl;
    }
    catch (const std::exception &e)
    {
	cerr << "ERROR -- caught exception: " << e.what() << endl;
	assert (false);
    }
}
