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testYca.cpp

//////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2004, Industrial Light & Magic, a division of Lucasfilm
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//////////////////////////////////////////////////////////////////////////////

#include <tmpDir.h>

#include <ImfRgbaFile.h>
#include <ImfArray.h>
#include <ImfThreading.h>
#include "IlmThread.h"
#include "ImathMath.h"
#include <stdio.h>
#include <assert.h>
#include <algorithm>

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

namespace {

void
fillPixelsColor (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 = 0.8 + 0.5 * sin (x * 0.05);
          p.g = 0.8 + 0.5 * sin (x * 0.02 + y * 0.02);
          p.b = 0.8 + 0.5 * sin (y * 0.03);

          float t = 0.8 + 0.5 * sin (x * 0.05 - y * 0.05);

          p.r *= t;
          p.g *= t;
          p.b *= t;
          p.a  = t;
      }
    }
}


void
fillPixelsGray (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 = 0.8 + 0.5 * sin (x * 0.05 - y * 0.05);
          p.g = p.r;
          p.b = p.r;
          p.a = 0.5 + 0.5 * cos (x * 0.05 - y * 0.05);
      }
    }
}


void
writeReadYca (const char fileName[],
            const Box2i &dw,
            RgbaChannels channels,
            LineOrder writeOrder,
            LineOrder readOrder,
            void (* fillPixels) (Array2D <Rgba> &pixels, int w, int h))
{
    int w = dw.max.x - dw.min.x + 1;
    int h = dw.max.y - dw.min.y + 1;
    Array2D <Rgba> pixels1 (h, w);
    Array2D <Rgba> pixels2 (h, w);

    cout << w << " by " << h << " pixels, "
          "channels " << channels << ", "
          "write order " << writeOrder << ", "
          "read order " << readOrder <<
          endl;

    fillPixels (pixels1, w, h);

    cout << "writing " << flush;

    {
      RgbaOutputFile out (fileName,
                      dw, dw, // display window, data window
                      channels,
                      1,            // pixelAspectRatio
                      V2f (0, 0),   // screenWindowCenter
                      1,            // screenWindowWidth
                      writeOrder);

      out.setYCRounding (9, 9);
      out.setFrameBuffer (&pixels1[-dw.min.y][-dw.min.x], 1, w);
      out.writePixels (h);
    }

    cout << "reading " << flush;

    {
      RgbaInputFile in (fileName);

      in.setFrameBuffer (&pixels2[-dw.min.y][-dw.min.x], 1, w);

      switch (readOrder)
      {
        case INCREASING_Y:

          for (int y = dw.min.y; y <= dw.max.y; ++y)
            in.readPixels (y);

          break;

        case DECREASING_Y:

          for (int y = dw.max.y; y >= dw.min.y; --y)
            in.readPixels (y);

          break;

        case RANDOM_Y:

          assert (h % 5 != 0);

          for (int i = 0; i < h; ++i)
          {
            int y = dw.min.y + (i * 5) % h;
            in.readPixels (y);
          }

          break;
      }
    }

    cout << "comparing" << endl;

    for (int y = 0; y < h; ++y)
    {
      for (int x = 0; x < w; ++x)
      {
          const Rgba &p1 = pixels1[y][x];
          const Rgba &p2 = pixels2[y][x];

          if (channels & WRITE_C)
          {
            float p1Max = max (p1.r, max (p1.g, p1.b));
            float p2Max = max (p2.r, max (p2.g, p2.b));

            assert (equalWithAbsError (p1Max, p2Max, 0.03f));
          }
          else
          {
            assert (p1.g == p2.g);
          }

          if (channels & WRITE_A)
          {
            assert (p1.a == p2.a);
          }
      }
    }

    remove (fileName);
}

} // namespace


void
testYca ()
{
    try
    {
        cout << "Testing luminance/chroma input and output" << endl;

      const char *fileName = IMF_TMP_DIR "imf_test_yca.exr";

      Box2i dataWindow[6];
      dataWindow[0] = Box2i (V2i (0, 0), V2i (1, 17));
      dataWindow[1] = Box2i (V2i (0, 0), V2i (5, 17));
      dataWindow[2] = Box2i (V2i (0, 0), V2i (17, 1));
      dataWindow[3] = Box2i (V2i (0, 0), V2i (17, 5));
      dataWindow[4] = Box2i (V2i (0, 0), V2i (1, 1));
      dataWindow[5] = Box2i (V2i (-18, -28), V2i (247, 255));

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

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

          for (int i = 0; i < 6; ++i)
          {
            for (int writeOrder = INCREASING_Y;
                 writeOrder <= DECREASING_Y;
                 ++writeOrder)
            {
                for (int readOrder = INCREASING_Y;
                   readOrder <= RANDOM_Y;
                   ++readOrder)
                {
                  writeReadYca (fileName, dataWindow[i],
                              WRITE_YCA,
                              LineOrder (writeOrder),
                              LineOrder (readOrder),
                              fillPixelsColor);

                  writeReadYca (fileName, dataWindow[i],
                              WRITE_YC,
                              LineOrder (writeOrder),
                              LineOrder (readOrder),
                              fillPixelsColor);

                  writeReadYca (fileName, dataWindow[i],
                              WRITE_YA,
                              LineOrder (writeOrder),
                              LineOrder (readOrder),
                              fillPixelsGray);

                  writeReadYca (fileName, dataWindow[i],
                              WRITE_Y,
                              LineOrder (writeOrder),
                              LineOrder (readOrder),
                              fillPixelsGray);
                }
            }
          }
      }

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

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