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