///////////////////////////////////////////////////////////////////////////

//

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

// Digital Ltd. LLC

// 

// All rights reserved.

// 

// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are

// met:

// *       Redistributions of source code must retain the above copyright

// notice, this list of conditions and the following disclaimer.

// *       Redistributions in binary form must reproduce the above

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// in the documentation and/or other materials provided with the

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// 

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///////////////////////////////////////////////////////////////////////////

//-----------------------------------------------------------------------------

//

//	function makeLatLongMap() -- makes latitude-longitude environment maps

//

//-----------------------------------------------------------------------------

#include <makeLatLongMap.h>

#include <resizeImage.h>

#include <ImfRgbaFile.h>

#include <ImfTiledRgbaFile.h>

#include <ImfStandardAttributes.h>

#include "Iex.h"

#include <iostream>

#include <algorithm>

#include "namespaceAlias.h"

using namespace IMF;

using namespace std;

using namespace IMATH;

void

makeLatLongMap (EnvmapImage &image1,

		Header &header,

		RgbaChannels channels,

	        const char outFileName[],

	        int tileWidth,

	        int tileHeight,

	        LevelMode levelMode,

	        LevelRoundingMode roundingMode,

		Compression compression,

	        int mapWidth,

	        float filterRadius,

	        int numSamples,

	        bool verbose)

{

    if (levelMode == RIPMAP_LEVELS)

    {

	throw IEX::NoImplExc ("Cannot generate ripmap "

			      "latitude-longitude environments.");

    }

    //

    // Open the file that will contain the latitude-longitude map,

    // and write the header.

    //

    int mapHeight = mapWidth / 2;

    header.dataWindow() = Box2i (V2i (0, 0), V2i (mapWidth - 1, mapHeight - 1));

    header.displayWindow() = header.dataWindow();

    header.compression() = compression;

    addEnvmap (header, ENVMAP_LATLONG);

    TiledRgbaOutputFile out (outFileName,

			     header,

			     channels,

			     tileWidth, tileHeight,

			     levelMode,

			     roundingMode);

    if (verbose)

	cout << "writing file " << outFileName << endl;

    //

    // Generate the pixels for the various levels of the latitude-longitude

    // map, and store them in the file.  The pixels for the highest-resolution

    // level are generated by resampling the original input image; for each of

    // the other levels, the pixels are generated by resampling the previous

    // level.

    //

    EnvmapImage image2;

    EnvmapImage *iptr1 = &image1;

    EnvmapImage *iptr2 = &image2;

    for (int level = 0; level < out.numLevels(); ++level)

    {

	if (verbose)

	    cout << "level " << level << endl;

	Box2i dw = out.dataWindowForLevel (level);

	resizeLatLong (*iptr1, *iptr2, dw, filterRadius, numSamples);

	out.setFrameBuffer (&(iptr2->pixels()[0][0]), 1, dw.max.x + 1);

	for (int tileY = 0; tileY < out.numYTiles (level); ++tileY)

	    for (int tileX = 0; tileX < out.numXTiles (level); ++tileX)

		out.writeTile (tileX, tileY, level);

	swap (iptr1, iptr2);

    }

    if (verbose)

	cout << "done." << endl;

}