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generalInterfaceTiledExamples.cpp

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// Copyright (c) 2002, Industrial Light & Magic, a division of Lucas
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//-----------------------------------------------------------------------------
//
//    Code examples that show how class TiledInputFile and
//    class TiledOutputFile can be used to read and write
//    OpenEXR image files with an arbitrary set of channels.
//
//-----------------------------------------------------------------------------


#include <ImfTiledOutputFile.h>
#include <ImfTiledInputFile.h>
#include <ImfChannelList.h>
#include <ImfStringAttribute.h>
#include <ImfMatrixAttribute.h>
#include <ImfArray.h>
#include <drawImage.h>

#include <iostream>

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


void
writeTiled1 (const char fileName[],
             Array2D<GZ> &pixels,
             int width, int height,
             int tileWidth, int tileHeight)
{
    Header header (width, height);
    header.channels().insert ("G", Channel (HALF));
    header.channels().insert ("Z", Channel (FLOAT));

    header.setTileDescription
      (TileDescription (tileWidth, tileHeight, ONE_LEVEL));
    
    TiledOutputFile out (fileName, header);

    FrameBuffer frameBuffer;

    frameBuffer.insert ("G",                           // name
                        Slice (HALF,                         // type
                         (char *) &pixels[0][0].g,     // base
                        sizeof (pixels[0][0]) * 1,     // xStride
                        sizeof (pixels[0][0]) * width)); // yStride

    frameBuffer.insert ("Z",                           // name
                        Slice (FLOAT,                        // type
                         (char *) &pixels[0][0].z,     // base
                        sizeof (pixels[0][0]) * 1,     // xStride
                        sizeof (pixels[0][0]) * width)); // yStride

    out.setFrameBuffer (frameBuffer);
    out.writeTiles (0, out.numXTiles() - 1, 0, out.numYTiles() - 1);
}


void
readTiled1 (const char fileName[],
            Array2D<GZ> &pixels,
            int &width, int &height)
{
    TiledInputFile in (fileName);

    Box2i dw = in.header().dataWindow();
    width  = dw.max.x - dw.min.x + 1;
    height = dw.max.y - dw.min.y + 1;
    int dx = dw.min.x;
    int dy = dw.min.y;

    pixels.resizeErase (height, width);

    FrameBuffer frameBuffer;

    frameBuffer.insert ("G",                           // name
                        Slice (HALF,                         // type
                         (char *) &pixels[-dy][-dx].g,       // base
                        sizeof (pixels[0][0]) * 1,     // xStride
                        sizeof (pixels[0][0]) * width)); // yStride

    frameBuffer.insert ("Z",                           // name
                        Slice (FLOAT,                        // type
                         (char *) &pixels[-dy][-dx].z,       // base
                        sizeof (pixels[0][0]) * 1,     // xStride
                        sizeof (pixels[0][0]) * width)); // yStride

    in.setFrameBuffer (frameBuffer);
    in.readTiles (0, in.numXTiles() - 1, 0, in.numYTiles() - 1);
}


void
generalInterfaceTiledExamples ()
{
    cout << "\nGZ (green, depth) tiled files\n" << endl;
    cout << "drawing image" << endl;

    int w = 800;
    int h = 600;

    Array2D<GZ>  pixels (h, w);
    drawImage6 (pixels, w, h);

    cout << "writing file" << endl;

    writeTiled1 ("tiledgz1.exr", pixels, w, h, 64, 64);

    cout << "reading file" << endl;

    readTiled1 ("tiledgz1.exr", pixels, w, h);
}

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