1 /*****************************************************************************/ 2 // Copyright 2006-2007 Adobe Systems Incorporated 3 // All Rights Reserved. 4 // 5 // NOTICE: Adobe permits you to use, modify, and distribute this file in 6 // accordance with the terms of the Adobe license agreement accompanying it. 7 /*****************************************************************************/ 8 9 /* $Id: //mondo/dng_sdk_1_4/dng_sdk/source/dng_xy_coord.cpp#1 $ */ 10 /* $DateTime: 2012/05/30 13:28:51 $ */ 11 /* $Change: 832332 $ */ 12 /* $Author: tknoll $ */ 13 14 /*****************************************************************************/ 15 16 #include "dng_xy_coord.h" 17 18 #include "dng_matrix.h" 19 #include "dng_utils.h" 20 21 /******************************************************************************/ 22 23 dng_xy_coord XYZtoXY (const dng_vector_3 &coord) 24 { 25 26 real64 X = coord [0]; 27 real64 Y = coord [1]; 28 real64 Z = coord [2]; 29 30 real64 total = X + Y + Z; 31 32 if (total > 0.0) 33 { 34 35 return dng_xy_coord (X / total, 36 Y / total); 37 38 } 39 40 return D50_xy_coord (); 41 42 } 43 44 /*****************************************************************************/ 45 46 dng_vector_3 XYtoXYZ (const dng_xy_coord &coord) 47 { 48 49 dng_xy_coord temp = coord; 50 51 // Restrict xy coord to someplace inside the range of real xy coordinates. 52 // This prevents math from doing strange things when users specify 53 // extreme temperature/tint coordinates. 54 55 temp.x = Pin_real64 (0.000001, temp.x, 0.999999); 56 temp.y = Pin_real64 (0.000001, temp.y, 0.999999); 57 58 if (temp.x + temp.y > 0.999999) 59 { 60 real64 scale = 0.999999 / (temp.x + temp.y); 61 temp.x *= scale; 62 temp.y *= scale; 63 } 64 65 return dng_vector_3 (temp.x / temp.y, 66 1.0, 67 (1.0 - temp.x - temp.y) / temp.y); 68 69 } 70 71 /*****************************************************************************/ 72 73 dng_xy_coord PCStoXY () 74 { 75 76 return D50_xy_coord (); 77 78 } 79 80 /*****************************************************************************/ 81 82 dng_vector_3 PCStoXYZ () 83 { 84 85 return XYtoXYZ (PCStoXY ()); 86 87 } 88 89 /*****************************************************************************/ 90
