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

//

// 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

// 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,

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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 "compareB44.h"

#include "compareDwa.h"

#include <ImfRgbaFile.h>

#include <ImfArray.h>

#include <string>

#include <ImathRandom.h>

#include <ImfThreading.h>

#include <IlmThread.h>

#include <IlmThreadMutex.h>

#include <IlmThreadSemaphore.h>

#include <ImfThreading.h>

#include <stdio.h>

#include <assert.h>

using namespace OPENEXR_IMF_NAMESPACE;

using namespace std;

using namespace IMATH_NAMESPACE;

using namespace ILMTHREAD_NAMESPACE;

namespace {

Rand48 rand1 (27);

Mutex scanlineMutex;

Semaphore threadSemaphore;

int remainingScanlines = 0;

void

fillPixels (Array2D<Rgba> &pixels, int w, int h)

{

    assert (sizeof (int) == sizeof (float));

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

    {

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

	{

	    Rgba &p = pixels[y][x];

	    p.r = x % 100 + 100 * (y % 100) +

		  rand1.nextf (-0.01f, -0.01f);

	    p.g = 0.5 + 0.5 * sin (0.1 * x + 0.2 * y) +

                  rand1.nextf (-0.01f, -0.01f);

	    p.b = 0.5 + 0.5 * sin (0.1 * x + 0.3 * y) +

                  rand1.nextf (-0.01f, -0.01f);

	    p.a = rand1.nextf (0.0f, 1.0f);

	}

    }

}

class WriterThread: public Thread

{

  public:

    WriterThread (RgbaOutputFile *outfile);

    virtual void	run ();

  private:

    RgbaOutputFile *	_outfile;

};

WriterThread::WriterThread (RgbaOutputFile *outfile): _outfile (outfile)

{

    start();

}

void

WriterThread::run ()

{

    //

    // Signal that the thread has started

    //

    threadSemaphore.post();

    while (true)

    {

	Lock lock (scanlineMutex);

	if (remainingScanlines)

	{

	    int n = int (rand1.nextf (0.0f, remainingScanlines) + 0.5f);

	    _outfile->writePixels (n);

	    remainingScanlines -= n;

	}

	else

	{

	    break;

	}

    }

}

class ReaderThread : public Thread

{

  public:

    ReaderThread (RgbaInputFile *infile, int start, int step);

    virtual void	run ();

  private:

    RgbaInputFile *	_infile;

    int			_start;

    int			_step;

};

ReaderThread::ReaderThread (RgbaInputFile *infile, int start, int step):

    _infile (infile), _start (start), _step (step)

{

    Thread::start();

}

void

ReaderThread::run ()

{

    //

    // Signal that the thread has started

    //

    threadSemaphore.post ();

    int num = _infile->header().dataWindow().max.y -

	      _infile->header().dataWindow().min.y + 1;

    for (int i = _start; i < num; i += _step)

	_infile->readPixels (i);

}

void

writeReadRGBA (const char fileName[],

	       int width,

	       int height,

	       const Array2D<Rgba> &p1,

	       RgbaChannels channels,

	       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": "") <<

	    ", compression " << comp << ", " << flush;

    Header header (width, height);

    header.compression() = comp;

    {

	remove (fileName);

        cout << "writing " << flush;

	RgbaOutputFile out (fileName, header, channels);

        out.setFrameBuffer (&p1[0][0], 1, width);

        remainingScanlines = height;

        WriterThread writer1 (&out;;

        WriterThread writer2 (&out;;

        threadSemaphore.wait();

        threadSemaphore.wait();

    }

    {

        cout << "reading " << flush;

	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);

        {

            ReaderThread reader1 (&in, 0, 2);

            ReaderThread reader2 (&in, 1, 2);

            threadSemaphore.wait();

            threadSemaphore.wait();

        }

	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);

        cout << "comparing " << endl;

	if (in.compression() == B44_COMPRESSION ||

	    in.compression() == B44A_COMPRESSION)

	{

	    compareB44 (width, height, p1, p2, channels);

	}

	else if (in.compression() == DWAA_COMPRESSION ||

	         in.compression() == DWAB_COMPRESSION)

	{

	    compareDwa (width, height, 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

testSharedFrameBuffer (const std::string &tempDir)

{

    try

    {

	cout << "Testing reading from and writing to files using\n"

		"multiple threads and a shared framebuffer" << endl;

        if (!ILMTHREAD_NAMESPACE::supportsThreads ())

        {

            cout << "   Threading not supported!" << endl << endl;

            return;

        }

	const int W = 1371;

	const int H = 159;

	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)

            {

                writeReadRGBA ((tempDir + "imf_test_rgba.exr").c_str(),

                                W, H, p1,

                                WRITE_RGBA,

                                Compression (comp));

                writeReadRGBA ((tempDir + "imf_test_rgba.exr").c_str(),

                                W, H, p1,

                                WRITE_RGB,

                                Compression (comp));

                writeReadRGBA ((tempDir + "imf_test_rgba.exr").c_str(),

                                W, H, p1,

                                WRITE_A,

                                Compression (comp));

                writeReadRGBA ((tempDir + "imf_test_rgba.exr").c_str(),

                                W, H, p1,

                                RgbaChannels (WRITE_R | WRITE_B),

                                Compression (comp));

            }

        }

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

    }

    catch (const std::exception &e)

    {

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

	assert (false);

    }

}