1 /*
2 Copyright (c) 2003-2010 Sony Pictures Imageworks Inc., et al.
3 All Rights Reserved.
4 
5 Redistribution and use in source and binary forms, with or without
6 modification, are permitted provided that the following conditions are
7 met:
8 * Redistributions of source code must retain the above copyright
9   notice, this list of conditions and the following disclaimer.
10 * Redistributions in binary form must reproduce the above copyright
11   notice, this list of conditions and the following disclaimer in the
12   documentation and/or other materials provided with the distribution.
13 * Neither the name of Sony Pictures Imageworks nor the names of its
14   contributors may be used to endorse or promote products derived from
15   this software without specific prior written permission.
16 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28 
29 
30 #ifndef INCLUDED_OCIO_LUT1DOP_H
31 #define INCLUDED_OCIO_LUT1DOP_H
32 
33 #include <OpenColorIO/OpenColorIO.h>
34 
35 #include "Mutex.h"
36 #include "Op.h"
37 
38 #include <vector>
39 
40 OCIO_NAMESPACE_ENTER
41 {
42     // TODO: turn into a class instead of a struct?
43 
44     enum ErrorType
45     {
46         ERROR_ABSOLUTE = 1,
47         ERROR_RELATIVE
48     };
49 
50 
51     struct Lut1D;
52     typedef OCIO_SHARED_PTR<Lut1D> Lut1DRcPtr;
53 
54     struct Lut1D
55     {
56         static Lut1DRcPtr Create();
57 
58         // This will compute the cacheid, and also
59         // determine if the lut is a no-op.
60         // If this lut is being read in from float ASCII text
61         // a value of 1e-5 is preferable.
62         // If this lut is being read in from integer ASCII
63         // representation, the value will depend on the LSB
64         // at the specified integer precision.
65         // Example: reading 10-bit ints? Use 2/1023.0
66         // If you dont want to do the noop computation,
67         // specify a 0.0 tolerance.
68         //
69         // TODO: Instead of having each user compute the error
70         // individually, maybe they should specify the original file bitdepth?
71         // (with appropriate precision tokens?)
72         float maxerror;
73         ErrorType errortype;
74 
75         float from_min[3];
76         float from_max[3];
77 
78         typedef std::vector<float> fv_t;
79         fv_t luts[3];
80 
81         std::string getCacheID() const;
82         bool isNoOp() const;
83 
84         void unfinalize();
85     private:
86         Lut1D();
87 
88         mutable std::string m_cacheID;
89         mutable bool m_isNoOp;
90         mutable Mutex m_mutex;
91 
92         void finalize() const;
93     };
94 
95     typedef OCIO_SHARED_PTR<Lut1D> Lut1DRcPtr;
96 
97     // This generates an identity 1d lut, from 0.0 to 1.0
98     void GenerateIdentityLut1D(float* img, int numElements, int numChannels);
99 
100     void CreateLut1DOp(OpRcPtrVec & ops,
101                        const Lut1DRcPtr & lut,
102                        Interpolation interpolation,
103                        TransformDirection direction);
104 }
105 OCIO_NAMESPACE_EXIT
106 
107 #endif
108