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testChannels.cpp

///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2002, 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
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///////////////////////////////////////////////////////////////////////////


#include <tmpDir.h>

#include <ImfOutputFile.h>
#include <ImfInputFile.h>
#include <ImfChannelList.h>
#include <ImfArray.h>
#include <half.h>

#include <stdio.h>
#include <assert.h>

using namespace std;
using namespace Imath;
using namespace Imf;

namespace {

void
fillPixels (Array2D<half> &ph1,
          Array2D<half> &ph2,
          int width, int height)
{
    for (int y = 0; y < height; ++y)
    {
      for (int x = 0; x < width; ++x)
      {
          ph1[y][x] = x % 10 + 10 * (y % 17);
          ph2[y][x] = x % 11 + 11 * (y % 15);
      }
    }
}


void
writeRead (const Array2D<half> &h1out,
         const Array2D<half> &h2out,
         const char fileName[],
         int width,
         int height)
{
    //
    // Write an image file with three channels, H1, H2 and H3.
    // Our frame buffer contains pixel data only for H1 and H2;
    // the file's H3 channel should be filled with zeroes.
    //

    Header hdr (width, height);

    hdr.channels().insert ("H1",                // name
                     Channel (HALF,       // type
                            1,                  // xSampling
                            1)                  // ySampling
                    );

    hdr.channels().insert ("H2",                // name
                     Channel (HALF,       // type
                            1,                  // xSampling
                            1)                  // ySampling
                    );

    hdr.channels().insert ("H3",                // name
                     Channel (HALF,       // type
                            1,                  // xSampling
                            1)                  // ySampling
                    );

    {
      FrameBuffer fb; 

      fb.insert ("H1",                    // name
               Slice (HALF,                     // type
                    (char *) &h1out[0][0],      // base
                    sizeof (h1out[0][0]),       // xStride
                    sizeof (h1out[0][0]) * width,     // yStride
                    1,                    // xSampling
                    1)                    // ySampling
              );

      fb.insert ("H2",                    // name
               Slice (HALF,                     // type
                    (char *) &h2out[0][0],      // base
                    sizeof (h2out[0][0]),       // xStride
                    sizeof (h2out[0][0]) * width,     // yStride
                    1,                    // xSampling
                    1)                    // ySampling
              );
      
      cout << "writing" << flush;

      remove (fileName);
      OutputFile out (fileName, hdr);
      out.setFrameBuffer (fb);
      out.writePixels (height);
    }

    //
    // Read the image back from the file.  Our frame buffer now
    // contains space for the three channels, H1, H3 and H4.
    // H1 and H3 should be read back from the file (but H3
    // should contain only zeroes), and H4 should be filled
    // with a default value, 3.0, because the file contains
    // no data for it.  The file's H2 channel should be ignored.
    //

    {
      cout << " reading" << flush;

      InputFile in (fileName);
      
      const Box2i &dw = in.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> h1in (h, w);
      Array2D<half> h3in (h, w);
      Array2D<half> h4in (h, w);

      FrameBuffer fb;

      fb.insert ("H1",                    // name
               Slice (HALF,                     // type
                    (char *) &h1in[-dy][-dx],   // base
                    sizeof (h1in[0][0]),        // xStride
                    sizeof (h1in[0][0]) * w,    // yStride
                    1,                    // xSampling
                    1,                    // ySampling
                    3.0)                        // fillValue
              );
          
      fb.insert ("H3",                    // name
               Slice (HALF,                     // type
                    (char *) &h3in[-dy][-dx],   // base
                    sizeof (h3in[0][0]),        // xStride
                    sizeof (h3in[0][0]) * w,    // yStride
                    1,                    // xSampling
                    1,                    // ySampling
                    3.0)                        // fillValue
              );
          
      fb.insert ("H4",                    // name
               Slice (HALF,                     // type
                    (char *) &h4in[-dy][-dx],   // base
                    sizeof (h4in[0][0]),        // xStride
                    sizeof (h4in[0][0]) * w,    // yStride
                    1,                    // xSampling
                    1,                    // ySampling
                    3.0)                        // fillValue
              );
          
      in.setFrameBuffer (fb);
      in.readPixels (dw.min.y, dw.max.y);

      cout << " comparing" << flush;

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

      ChannelList::ConstIterator hi = hdr.channels().begin();
      ChannelList::ConstIterator ii = in.header().channels().begin();

      while (hi != hdr.channels().end())
      {
          assert (!strcmp (hi.name(), ii.name()));
          assert (hi.channel().type == ii.channel().type);
          assert (hi.channel().xSampling == ii.channel().xSampling);
          assert (hi.channel().ySampling == ii.channel().ySampling);

          ++hi;
          ++ii;
      }

      assert (ii == in.header().channels().end());

      for (int y = 0; y < h; ++y)
      {
          for (int x = 0; x < w; ++x)
          {
            assert (h1in[y][x] == h1out[y][x]);
            assert (h3in[y][x] == 0.0);
            assert (h4in[y][x] == 3.0);
          }
      }
    }

    remove (fileName);
    cout << endl;
}


} // namespace


void
testChannels ()
{
    try
    {
      cout << "Testing filling of missing channels" << endl;

      const int W = 117;
      const int H = 97;

      Array2D<half> ph1 (H, W);
      Array2D<half> ph2 (H, W);
      fillPixels (ph1, ph2, W, H);

      const char *filename = IMF_TMP_DIR "imf_test_channels.exr";

      writeRead (ph1, ph2, filename, W, H);

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

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