/*****************************************************************************/
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// Copyright 2006-2007 Adobe Systems Incorporated
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// All Rights Reserved.
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//
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// NOTICE: Adobe permits you to use, modify, and distribute this file in
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// accordance with the terms of the Adobe license agreement accompanying it.
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/*****************************************************************************/
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/* $Id: //mondo/dng_sdk_1_4/dng_sdk/source/dng_xy_coord.cpp#1 $ */
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/* $DateTime: 2012/05/30 13:28:51 $ */
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/* $Change: 832332 $ */
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/* $Author: tknoll $ */
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/*****************************************************************************/
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#include "dng_xy_coord.h"
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#include "dng_matrix.h"
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#include "dng_utils.h"
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/******************************************************************************/
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dng_xy_coord XYZtoXY (const dng_vector_3 &coord)
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{
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real64 X = coord [0];
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real64 Y = coord [1];
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real64 Z = coord [2];
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real64 total = X + Y + Z;
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if (total > 0.0)
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{
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return dng_xy_coord (X / total,
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Y / total);
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}
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return D50_xy_coord ();
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}
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/*****************************************************************************/
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dng_vector_3 XYtoXYZ (const dng_xy_coord &coord)
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{
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dng_xy_coord temp = coord;
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// Restrict xy coord to someplace inside the range of real xy coordinates.
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// This prevents math from doing strange things when users specify
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// extreme temperature/tint coordinates.
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temp.x = Pin_real64 (0.000001, temp.x, 0.999999);
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temp.y = Pin_real64 (0.000001, temp.y, 0.999999);
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if (temp.x + temp.y > 0.999999)
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{
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real64 scale = 0.999999 / (temp.x + temp.y);
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temp.x *= scale;
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temp.y *= scale;
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}
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return dng_vector_3 (temp.x / temp.y,
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1.0,
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(1.0 - temp.x - temp.y) / temp.y);
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}
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/*****************************************************************************/
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dng_xy_coord PCStoXY ()
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{
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return D50_xy_coord ();
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}
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/*****************************************************************************/
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dng_vector_3 PCStoXYZ ()
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{
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return XYtoXYZ (PCStoXY ());
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}
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/*****************************************************************************/
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