/src/skia/third_party/externals/dng_sdk/source/dng_xy_coord.cpp
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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 | 0 | { |
25 | | |
26 | 0 | real64 X = coord [0]; |
27 | 0 | real64 Y = coord [1]; |
28 | 0 | real64 Z = coord [2]; |
29 | | |
30 | 0 | real64 total = X + Y + Z; |
31 | | |
32 | 0 | if (total > 0.0) |
33 | 0 | { |
34 | | |
35 | 0 | return dng_xy_coord (X / total, |
36 | 0 | Y / total); |
37 | | |
38 | 0 | } |
39 | | |
40 | 0 | return D50_xy_coord (); |
41 | | |
42 | 0 | } |
43 | | |
44 | | /*****************************************************************************/ |
45 | | |
46 | | dng_vector_3 XYtoXYZ (const dng_xy_coord &coord) |
47 | 0 | { |
48 | | |
49 | 0 | 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 | 0 | temp.x = Pin_real64 (0.000001, temp.x, 0.999999); |
56 | 0 | temp.y = Pin_real64 (0.000001, temp.y, 0.999999); |
57 | | |
58 | 0 | if (temp.x + temp.y > 0.999999) |
59 | 0 | { |
60 | 0 | real64 scale = 0.999999 / (temp.x + temp.y); |
61 | 0 | temp.x *= scale; |
62 | 0 | temp.y *= scale; |
63 | 0 | } |
64 | | |
65 | 0 | return dng_vector_3 (temp.x / temp.y, |
66 | 0 | 1.0, |
67 | 0 | (1.0 - temp.x - temp.y) / temp.y); |
68 | | |
69 | 0 | } |
70 | | |
71 | | /*****************************************************************************/ |
72 | | |
73 | | dng_xy_coord PCStoXY () |
74 | 0 | { |
75 | | |
76 | 0 | return D50_xy_coord (); |
77 | | |
78 | 0 | } |
79 | | |
80 | | /*****************************************************************************/ |
81 | | |
82 | | dng_vector_3 PCStoXYZ () |
83 | 0 | { |
84 | | |
85 | 0 | return XYtoXYZ (PCStoXY ()); |
86 | | |
87 | 0 | } |
88 | | |
89 | | /*****************************************************************************/ |