1 | /*****************************************************************************/ |
2 | // Copyright 2006 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_rational.cpp#1 $ */ |
10 | /* $DateTime: 2012/05/30 13:28:51 $ */ |
11 | /* $Change: 832332 $ */ |
12 | /* $Author: tknoll $ */ |
13 | |
14 | /*****************************************************************************/ |
15 | |
16 | #include "dng_rational.h" |
17 | |
18 | #include "dng_utils.h" |
19 | |
20 | /*****************************************************************************/ |
21 | |
22 | real64 dng_srational::As_real64 () const |
23 | { |
24 | |
25 | if (d) |
26 | return (real64) n / (real64) d; |
27 | |
28 | else |
29 | return 0.0; |
30 | |
31 | } |
32 | |
33 | /*****************************************************************************/ |
34 | |
35 | void dng_srational::Set_real64 (real64 x, int32 dd) |
36 | { |
37 | |
38 | if (x == 0.0) |
39 | { |
40 | |
41 | *this = dng_srational (0, 1); |
42 | |
43 | } |
44 | |
45 | if (dd == 0) |
46 | { |
47 | |
48 | real64 y = Abs_real64 (x); |
49 | |
50 | if (y >= 32768.0) |
51 | { |
52 | dd = 1; |
53 | } |
54 | |
55 | else if (y >= 1.0) |
56 | { |
57 | dd = 32768; |
58 | } |
59 | |
60 | else |
61 | { |
62 | dd = 32768 * 32768; |
63 | } |
64 | |
65 | } |
66 | |
67 | *this = dng_srational (Round_int32 (x * dd), dd); |
68 | |
69 | } |
70 | |
71 | /*****************************************************************************/ |
72 | |
73 | void dng_srational::ReduceByFactor (int32 factor) |
74 | { |
75 | |
76 | while (n % factor == 0 && |
77 | d % factor == 0 && |
78 | d >= factor) |
79 | { |
80 | n /= factor; |
81 | d /= factor; |
82 | } |
83 | |
84 | } |
85 | |
86 | /*****************************************************************************/ |
87 | |
88 | real64 dng_urational::As_real64 () const |
89 | { |
90 | |
91 | if (d) |
92 | return (real64) n / (real64) d; |
93 | |
94 | else |
95 | return 0.0; |
96 | |
97 | } |
98 | |
99 | /*****************************************************************************/ |
100 | |
101 | void dng_urational::Set_real64 (real64 x, uint32 dd) |
102 | { |
103 | |
104 | if (x <= 0.0) |
105 | { |
106 | |
107 | *this = dng_urational (0, 1); |
108 | |
109 | } |
110 | |
111 | if (dd == 0) |
112 | { |
113 | |
114 | if (x >= 32768.0) |
115 | { |
116 | dd = 1; |
117 | } |
118 | |
119 | else if (x >= 1.0) |
120 | { |
121 | dd = 32768; |
122 | } |
123 | |
124 | else |
125 | { |
126 | dd = 32768 * 32768; |
127 | } |
128 | |
129 | } |
130 | |
131 | *this = dng_urational (Round_uint32 (x * dd), dd); |
132 | |
133 | } |
134 | |
135 | /*****************************************************************************/ |
136 | |
137 | void dng_urational::ReduceByFactor (uint32 factor) |
138 | { |
139 | |
140 | while (n % factor == 0 && |
141 | d % factor == 0 && |
142 | d >= factor) |
143 | { |
144 | n /= factor; |
145 | d /= factor; |
146 | } |
147 | |
148 | } |
149 | |
150 | /*****************************************************************************/ |
151 | |