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testTiledYa.cpp

//////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2004, Industrial Light & Magic, a division of Lucasfilm
// Entertainment Company Ltd.  Portions contributed and copyright held by
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#include <tmpDir.h>

#include <ImfTiledRgbaFile.h>
#include <ImfArray.h>
#include <stdio.h>
#include <assert.h>
#include <math.h>

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

namespace {

void
waves (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 = (0.5 + 0.5 * sin (0.1 * x + 0.1 * y)) +
              (0.5 + 0.5 * sin (-0.1 * x + 0.2 * y));

          p.g = p.r;
          p.b = p.r;

          p.a = (0.5 + 0.5 * sin (1.1 * x + 0.5 * y));
      }
    }
}


void
wheel (Array2D<Rgba> &pixels, int w, int h)
{
    float n = 40;
    float m = 0.5;
    float radMin = 2 * n / M_PI;
    float xCen = w * 0.5;
    float yCen = h * 0.5;
    float radMax = (xCen < yCen)? xCen: yCen;

    for (int y = 0; y < h; ++y)
    {
      for (int x = 0; x < w; ++x)
      {
          Rgba &p = pixels[y][x];
          float rad = sqrt ((x-xCen) * (x-xCen) + (y-yCen) * (y-yCen));

          if (rad <= radMax && rad >= radMin)
          {
            float phi = atan2 (y - yCen, x - xCen);
            float c = 0.5 + 0.5 * sin (phi * n + rad * m);

            p.r = 0.5 + 0.5 * c;
            p.g = p.r;
            p.b = p.r;
            p.a = 0.5 - 0.5 * c;
          }
          else
          {
            p.r = 0.5;
            p.g = p.r;
            p.b = p.r;
            p.a = p.r;
          }
      }
    }
}


void
writeReadYa (Box2i &dw,
           int tileSizeX,
           int tileSizeY,
           const char fileName[],
           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);

    fillPixels (pixels1, w, h);

    cout << "writing " << flush;

    {
      TiledRgbaOutputFile out (fileName,
                         tileSizeX, tileSizeY,
                         ONE_LEVEL, ROUND_DOWN,
                         dw, dw,
                         WRITE_YA);

      out.setFrameBuffer (&pixels1[-dw.min.y][-dw.min.x], 1, w);

      for (int y = 0; y < out.numYTiles(); ++y)
          for (int x = 0; x < out.numXTiles(); ++x)
            out.writeTile (x, y);
    }

    cout << "reading " << flush;

    {
      TiledRgbaInputFile in (fileName);

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

      for (int y = 0; y < in.numYTiles(); ++y)
          for (int x = 0; x < in.numXTiles(); ++x)
            in.readTile (x, y);
    }

    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];

          assert (p1.r == p2.r);
          assert (p1.g == p2.g);
          assert (p1.b == p2.b);
          assert (p1.a == p2.a);
      }
    }

    remove (fileName);
}

} // namespace


void
testTiledYa ()
{
    try
    {
        cout << "Testing tiled luminance input and output" << endl;

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

      Box2i dataWindow (V2i (-17, -29), V2i (348, 556));
      writeReadYa (dataWindow, 19, 27, fileName, waves);
      writeReadYa (dataWindow, 19, 27, fileName, wheel);

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

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