Writing out to file : one tile at a time

Hi,

  I am writing out a checker image to better understand setFramebuffer and
writeTile

  The current version I have stores the "entire" width+height black and
white pixel data and choose from there.

  I am hoping to find a way, possibly in setFramebuffer, where I can supply
a tile size pixel data (one black, one white) to choose from rather than an
entire width/height version which defeats the purpose of being able to
handle/process pixels on a tile by tile basis.

8<--------------------------------------------
void writeChecker (const char fileName[],
           int width, int height,
           int tileWidth, int tileHeight)
{
    Imf::TiledRgbaOutputFile out (fileName,
                                  width, height, // image size
                                  tileWidth, tileHeight, // tile size
                                  Imf::ONE_LEVEL, // level mode
                                  Imf::ROUND_DOWN, // rounding mode
                                  Imf::WRITE_RGBA); // channels in file // 1
    int xTileCount = out.numXTiles();
    int yTileCount = out.numYTiles();

    RgbaArray whitePixels;
    whitePixels.resize(boost::extents[width][height]);

    for (RgbaArray::index h=0;h<height;h++)
        for (RgbaArray::index w=0;w<width;w++)
        {
                whitePixels[w][h] = whitePixel;
        }

    RgbaArray blackPixels;
    blackPixels.resize(boost::extents[width][height]);

    for (RgbaArray::index h=0;h<height;h++)
        for (RgbaArray::index w=0;w<width;w++)
        {
                blackPixels[w][h] = blackPixel;
        }

    for (int y=0;y<yTileCount;y++)
    for (int x=0;x<xTileCount;x++)
    {
    bool isWhite = checkeredWhite(x,y);

    if (isWhite)
        out.setFrameBuffer (whitePixels.data(), 1, tileWidth);
    else
                out.setFrameBuffer (blackPixels.data(), 1, tileWidth);
    out.writeTile (x,y);
    }
}
8<--------------------------------------------
Cheers
-- 
Nicholas Yue
Graphics - Arnold, Alembic, RenderMan, OpenGL, HDF5
Custom Dev - C++ porting, OSX, Linux, Windows
http://au.linkedin.com/in/nicholasyue
https://vimeo.com/channels/naiadtools

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