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[gdcm.git] / src / gdcmSegmentedPalette.h
1 /*=========================================================================
2  
3   Program:   gdcm
4   Module:    $RCSfile: gdcmSegmentedPalette.h,v $
5   Language:  C++
6   Date:      $Date: 2007/10/03 09:46:09 $
7   Version:   $Revision: 1.4 $
8                                                                                 
9   Copyright (c) CREATIS (Centre de Recherche et d'Applications en Traitement de
10   l'Image). All rights reserved. See Doc/License.txt or
11   http://www.creatis.insa-lyon.fr/Public/Gdcm/License.html for details.
12                                                                                 
13      This software is distributed WITHOUT ANY WARRANTY; without even
14      the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
15      PURPOSE.  See the above copyright notices for more information.
16                                                                                 
17 =========================================================================*/
18
19 #include <gdcm.h>
20 // Ref: 
21 // http://blog.goo.ne.jp/satomi_takeo/e/3643e5249b2a9650f9e10ef1c830e8b8
22 // I bet the code was compiled on VS6. Make it compile on other platform:
23 // * typedef are not inherited
24 // * need to explicitely add typename keyword
25 // * Uint8 / Uint16 are neither C nor C++
26 // * replace all dcmtk code with equivalent gdcm code
27 // * Add extra parameter to ReadPaletteInto to save extracted info
28
29 #include <assert.h>
30 #include <algorithm>
31 #include <deque>
32 #include <map>
33 #include <vector>
34 #include <iterator>
35
36 namespace gdcm {
37     // abstract class for segment.
38     template <typename EntryType>
39     class Segment {
40     public:
41         typedef std::map<const EntryType*, const Segment*> SegmentMap;
42         virtual bool Expand(const SegmentMap& instances,
43             std::vector<EntryType>& expanded) const = 0;
44         const EntryType* First() const { return _first; }
45         const EntryType* Last() const { return _last; }
46         struct ToMap {
47             std::pair<
48                 typename SegmentMap::key_type,
49                 typename SegmentMap::mapped_type
50             >
51                 operator()(const Segment* segment) const
52             { return std::make_pair(segment->First(), segment); }
53         };
54     protected:
55         Segment(const EntryType* first, const EntryType* last) {
56             _first = first; _last = last;
57         }
58         const EntryType* _first;
59         const EntryType* _last;
60     };
61
62     // discrete segment (opcode = 0)
63     template <typename EntryType>
64     class DiscreteSegment : public Segment<EntryType> {
65     public:
66         typedef typename Segment<EntryType>::SegmentMap SegmentMap;
67         DiscreteSegment(const EntryType* first)
68             : Segment<EntryType>(first, first+2+*(first+1)) {}
69         virtual bool Expand(const SegmentMap&,
70             std::vector<EntryType>& expanded) const
71         {
72             std::copy(this->_first + 2, this->_last, std::back_inserter(expanded));
73             return true;
74         }
75     };
76
77     // linear segment (opcode = 1)
78     template <typename EntryType>
79     class LinearSegment : public Segment<EntryType> {
80     public:
81         typedef typename Segment<EntryType>::SegmentMap SegmentMap;
82         LinearSegment(const EntryType* first)
83             : Segment<EntryType>(first, first+3) {}
84         virtual bool Expand(const SegmentMap&,
85             std::vector<EntryType>& expanded) const
86         {
87             if ( expanded.empty() ) {
88                 // linear segment can't be the first segment.
89                 return false;
90             }
91             EntryType length = *(this->_first + 1);
92             EntryType y0 = expanded.back();
93             EntryType y1 = *(this->_first + 2);
94             double y01 = y1 - y0;
95             for ( EntryType i = 0; i <length; ++i ) {
96                 double value_float
97                     = static_cast<double>(y0)
98                     + (static_cast<double>(i)/static_cast<double>(length)) * y01;
99                 EntryType value_int = static_cast<EntryType>(value_float + 0.5);
100                 expanded.push_back(value_int);
101             }
102             return true;
103         }
104     };
105
106     // indirect segment (opcode = 2)
107     template <typename EntryType>
108     class IndirectSegment : public Segment<EntryType> {
109     public:
110         typedef typename Segment<EntryType>::SegmentMap SegmentMap;
111         IndirectSegment(const EntryType* first)
112             : Segment<EntryType>(first, first+2+4/sizeof(EntryType)) {}
113         virtual bool Expand(const SegmentMap& instances,
114             std::vector<EntryType>& expanded) const
115         {
116             if ( instances.empty() ) {
117                 // some other segments are required as references.
118                 return false;
119             }
120             const EntryType* first_segment = instances.begin()->first;
121             const unsigned short* pOffset
122                 = reinterpret_cast<const unsigned short*>(this->_first + 2);
123             unsigned long offsetBytes
124                 = (*pOffset) | (static_cast<unsigned long>(*(pOffset + 1)) << 16);
125             const EntryType* copied_part_head
126                 = first_segment + offsetBytes / sizeof(EntryType);
127             typename SegmentMap::const_iterator ppHeadSeg = instances.find(copied_part_head);
128             if ( ppHeadSeg == instances.end() ) {
129                 // referred segment not found
130                 return false;
131             }
132             EntryType nNumCopies = *(this->_first + 1);
133             typename SegmentMap::const_iterator ppSeg = ppHeadSeg;
134             while ( std::distance(ppHeadSeg, ppSeg) <nNumCopies ) {
135                 assert( ppSeg != instances.end() );
136                 ppSeg->second->Expand(instances, expanded);
137                 ++ppSeg;
138             }
139             return true;
140         }
141     };
142
143     template <typename EntryType>
144     void ExpandPalette(const EntryType* raw_values, uint32_t length,
145         std::vector<EntryType>& palette)
146     {
147         typedef std::deque<Segment<EntryType>*> SegmentList;
148         SegmentList segments;
149         const EntryType* raw_seg = raw_values;
150         while ( (std::distance(raw_values, raw_seg) * sizeof(EntryType)) <length ) {
151             Segment<EntryType>* segment = NULL;
152             if ( *raw_seg == 0 ) {
153                 segment = new DiscreteSegment<EntryType>(raw_seg);
154             } else if ( *raw_seg == 1 ) {
155                 segment = new LinearSegment<EntryType>(raw_seg);
156             } else if ( *raw_seg == 2 ) {
157                 segment = new IndirectSegment<EntryType>(raw_seg);
158             }
159             if ( segment ) {
160                 segments.push_back(segment);
161                 raw_seg = segment->Last();
162             } else {
163                 // invalid opcode
164                 break;
165             }
166         }
167         typename Segment<EntryType>::SegmentMap instances;
168         std::transform(segments.begin(), segments.end(),
169             std::inserter(instances, instances.end()), typename Segment<EntryType>::ToMap());
170         typename SegmentList::iterator ppSeg = segments.begin();
171         typename SegmentList::iterator endOfSegments = segments.end();
172         for ( ; ppSeg != endOfSegments; ++ppSeg ) {
173             (*ppSeg)->Expand(instances, palette);
174         }
175         ppSeg = segments.begin();
176         for ( ; ppSeg != endOfSegments; ++ppSeg ) {
177             delete *ppSeg;
178         }
179     }
180
181     void ReadPaletteInto(GDCM_NAME_SPACE::File* pds, const GDCM_NAME_SPACE::TagKey& descriptor,
182       const GDCM_NAME_SPACE::TagKey& segment, uint8_t* lut)
183       {
184       int desc_values[3] = {};
185       unsigned long count = 0;
186       //if ( pds->findAndGetUint16Array(descriptor, desc_values, &count).good() )
187       std::string desc_values_str = pds->GetEntryString(descriptor.GetGroup(), descriptor.GetElement() );
188       count = sscanf( desc_values_str.c_str(), "%d\\%d\\%d", desc_values, desc_values+1, desc_values+2 );
189         {
190         assert( count == 3 );
191         unsigned int num_entries = desc_values[0];
192         if ( num_entries == 0 ) {
193           num_entries = 0x10000;
194         }
195         int min_pixel_value = desc_values[1];
196         unsigned int entry_size = desc_values[2];
197         assert( entry_size == 8 || entry_size == 16 );
198         //DcmElement* pe = NULL;
199         GDCM_NAME_SPACE::DataEntry* pe = NULL;
200
201         pe = pds->GetDataEntry(segment.GetGroup(), segment.GetElement() ); {
202           //if ( pds->findAndGetElement(segment, pe).good() )
203           unsigned long length = pe->GetLength();
204           if ( entry_size == 8 ) {
205             uint8_t* segment_values = NULL;
206             //if ( pe->getUint8Array(segment_values).good() )
207             segment_values = (uint8_t*)pe->GetBinArea(); {
208               std::vector<uint8_t> palette;
209               palette.reserve(num_entries);
210               ExpandPalette(segment_values, length, palette);
211               memcpy(lut, &palette[0], palette.size() );
212             }
213           } else if ( entry_size == 16 ) {
214             uint16_t* segment_values = NULL;
215             segment_values = (uint16_t*)pe->GetBinArea(); {
216               //if ( pe->getUint16Array(segment_values).good() )
217               std::vector<uint16_t> palette;
218               palette.reserve(num_entries);
219               ExpandPalette(segment_values, length, palette);
220               memcpy(lut, &palette[0], palette.size()*2 );
221 //              std::copy(palette.begin(), palette.end(), 
222 //                std::ostream_iterator<uint16_t>(std::cout, "\n"));
223
224             }
225           }
226         }
227         }
228       }
229 } // end namespace
230
231