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testPreviewImage.cpp

///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2003, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
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// All rights reserved.
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// *       Redistributions in binary form must reproduce the above
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// from this software without specific prior written permission. 
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#include <tmpDir.h>

#include <ImfRgbaFile.h>
#include <ImfArray.h>
#include <ImfPreviewImage.h>
#include <fstream>
#include <stdio.h>
#include <assert.h>

#ifndef ILM_IMF_TEST_IMAGEDIR
    #define ILM_IMF_TEST_IMAGEDIR
#endif


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

namespace {

void
readWriteFiles (const char fileName1[],
              const char fileName2[],
            const char fileName3[])
{
    //
    // Test if the preview image attribute works correctly:
    //
    // Read file1, which does not contain a preview image.
    //
    // Generate a preview image, and store both the pixels
    // from file 1 and the preview image in file 2.
    //
    // Read file 2, and verify that both the preview image, and
    // the main image are exactly what we stored in the file.
    //
    // Write file 3, with the same main image as file 2, but
    // initially leave the preview image blank.  Update the
    // preview image half way through writing the main image's
    // pixels.
    //
    // Compare file 2 and file 3 byte by byte, and verify that
    // the files are identical.
    //

    cout << "reading file " << fileName1 << endl;

    RgbaInputFile file1 (fileName1);

    assert (!file1.header().hasPreviewImage());

    const Box2i &dw = file1.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;

    Array<Imf::Rgba> pixels1 (w * h);
    file1.setFrameBuffer (pixels1 - dx - dy * w, 1, w);
    file1.readPixels (dw.min.y, dw.max.y);

    cout << "generating preview image" << endl;

    const int PREVIEW_WIDTH  = 128;
    const int PREVIEW_HEIGHT = 64;

    PreviewImage preview1 (PREVIEW_WIDTH, PREVIEW_HEIGHT);

    for (int y = 0; y < PREVIEW_HEIGHT; ++y)
      for (int x = 0; x < PREVIEW_WIDTH; ++x)
          preview1.pixel (x, y) = PreviewRgba (x*2, y*4, x+y, 128);

    cout << "writing file " << fileName2 << endl;

    {
      Header header (file1.header());
      header.setPreviewImage (preview1);

      RgbaOutputFile file2 (fileName2, header);
      file2.setFrameBuffer (pixels1 - dx - dy * w, 1, w);

      for (int y = dw.min.y; y <= dw.max.y; ++y)
          file2.writePixels (1);
    }

    cout << "reading file " << fileName2 << endl;

    {
      RgbaInputFile file2 (fileName2);

      assert (file2.header().hasPreviewImage());

      const PreviewImage &preview2 = file2.header().previewImage();

      for (int i = 0; i < PREVIEW_WIDTH * PREVIEW_HEIGHT; ++i)
      {
          assert (preview1.pixels()[i].r == preview2.pixels()[i].r);
          assert (preview1.pixels()[i].g == preview2.pixels()[i].g);
          assert (preview1.pixels()[i].b == preview2.pixels()[i].b);
          assert (preview1.pixels()[i].a == preview2.pixels()[i].a);
      }

      assert (dw == file2.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;

      Array<Imf::Rgba> pixels2 (w * h);
      file2.setFrameBuffer (pixels2 - dx - dy * w, 1, w);
      file2.readPixels (dw.min.y, dw.max.y);

      for (int i = 0; i < w * h; ++h)
      {
          assert (pixels1[i].r == pixels2[i].r);
          assert (pixels1[i].g == pixels2[i].g);
          assert (pixels1[i].b == pixels2[i].b);
          assert (pixels1[i].a == pixels2[i].a);
      }
    }

    cout << "writing file " << fileName3 << endl;

    {
      Header header (file1.header());
      header.setPreviewImage (PreviewImage (PREVIEW_WIDTH, PREVIEW_HEIGHT));

      RgbaOutputFile file3 (fileName3, header);
      file3.setFrameBuffer (pixels1 - dx - dy * w, 1, w);

      for (int y = dw.min.y; y <= dw.max.y; ++y)
      {
          file3.writePixels (1);

          if (y == (dw.min.y + dw.max.y) / 2)
            file3.updatePreviewImage (preview1.pixels());
      }
    }

    cout << "comparing files " << fileName2 << " and " << fileName3 << endl;

    {
      ifstream file2 (fileName2, std::ios_base::binary);
      ifstream file3 (fileName3, std::ios_base::binary);

      while (true)
      {
          int c2 = file2.get();
          int c3 = file3.get();

          if (file2.eof())
            break;

          assert (c2 == c3);
          assert (!!file2 && !!file3);
      }
    }

    remove (fileName2);
    remove (fileName3);
}

} // namespace


void
testPreviewImage ()
{
    const char *filename1 = IMF_TMP_DIR "imf_preview1.exr";
    const char *filename2 = IMF_TMP_DIR "imf_preview2.exr";

    try
    {
      cout << "Testing preview image attribute" << endl;

      readWriteFiles (ILM_IMF_TEST_IMAGEDIR "comp_piz.exr",
                  filename1,
                  filename2);

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


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