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testLineOrder.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
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// 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.
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///////////////////////////////////////////////////////////////////////////


#include <tmpDir.h>

#include <ImfOutputFile.h>
#include <ImfInputFile.h>
#include <ImfChannelList.h>
#include <ImfArray.h>
#include <ImfThreading.h>
#include "IlmThread.h"
#include "half.h"

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

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

namespace {

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


void
writeRead (const Array2D<half> &ph1,
         const char fileName[],
         int width,
         int height,
         LineOrder lorder)
{
    //
    // Write the pixel data in ph1 to an image file using
    // the specified line order.  Read the pixel data back
    // from the file in pseudo-random order and verify that
    // the data did not change.
    //

    cout << "line order " << lorder <<
          ":" << flush;

    Header hdr (width, height);
    hdr.lineOrder() = lorder;

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

    {
      FrameBuffer fb; 

      fb.insert ("H",                           // name
               Slice (HALF,                     // type
                    (char *) &ph1[0][0],        // base
                    sizeof (ph1[0][0]),         // xStride
                    sizeof (ph1[0][0]) * width, // yStride
                    1,                    // xSampling
                    1)                    // ySampling
              );
      
      cout << " writing" << flush;

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

    {
      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> ph2 (h, w);

      FrameBuffer fb;

      fb.insert ("H",                           // name
               Slice (HALF,                     // type
                    (char *) &ph2[-dy][-dx],    // base
                    sizeof (ph2[0][0]),         // xStride
                    sizeof (ph2[0][0]) * w,     // yStride
                    1,                    // xSampling
                    1)                    // ySampling
              );
          
      in.setFrameBuffer (fb);

      //
      // Read the scan lines in this order:
      // 0, N, 2N, 3N, ... 1, N+1, 2N+1, ... 2, N+2, 2N+2, ...
      //

      const int N = 7;

      for (int i = 0; i < N; ++i)
          for (int y = dw.min.y + i; y <= dw.max.y; y += N)
            in.readPixels (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 (ph1[y][x] == ph2[y][x]);
    }

    remove (fileName);
    cout << endl;
}


} // namespace


void
testLineOrder ()
{
    try
    {
      cout << "Testing line order and random access to scan lines" << endl;

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

      Array2D<half> ph (H, W);
      fillPixels (ph, W, H);

      int maxThreads = IlmThread::supportsThreads()? 3: 0;

      for (int n = 0; n <= maxThreads; ++n)
      {
          if (IlmThread::supportsThreads())
          {
            setGlobalThreadCount (n);
            cout << "\nnumber of threads: " << globalThreadCount() << endl;
          }

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

          for (int lorder = 0; lorder < RANDOM_Y; ++lorder)
          {
            writeRead (ph,
                     filename,
                     W, H,
                     LineOrder (lorder));
          }
      }

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

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