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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 13:18:28 $
7   Version:   $Revision: 1.8 $
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 #ifndef _GDCMSEGMENTEDPALETTE_H_
20 #define _GDCMSEGMENTEDPALETTE_H_
21
22 #include "gdcmFile.h"
23 #include "gdcmTagKey.h"
24 #include "gdcmDataEntry.h"
25
26 // Ref: 
27 // http://blog.goo.ne.jp/satomi_takeo/e/3643e5249b2a9650f9e10ef1c830e8b8
28 // I bet the code was compiled on VS6. Make it compile on other platform:
29 // * typedef are not inherited
30 // * need to explicitely add typename keyword
31 // * Uint8 / Uint16 are neither C nor C++
32 // * replace all dcmtk code with equivalent gdcm code
33 // * Add extra parameter to ReadPaletteInto to save extracted info
34
35 // MM: Over 50000 DICOM files I only found two that had a Segmented Palette LUT
36 // And both were coming from a ALOKA SSD-4000 station
37 #include <assert.h>
38 #include <algorithm>
39 #include <deque>
40 #include <map>
41 #include <vector>
42 #include <iterator>
43
44 namespace GDCM_NAME_SPACE
45 {
46     // abstract class for segment.
47     template <typename EntryType>
48     class Segment {
49     public:
50         typedef std::map<const EntryType*, const Segment*> SegmentMap;
51         virtual bool Expand(const SegmentMap& instances,
52             std::vector<EntryType>& expanded) const = 0;
53         const EntryType* First() const { return _first; }
54         const EntryType* Last() const { return _last; }
55         struct ToMap {
56             std::pair<
57                 typename SegmentMap::key_type,
58                 typename SegmentMap::mapped_type
59             >
60                 operator()(const Segment* segment) const
61             { return std::make_pair(segment->First(), segment); }
62         };
63     protected:
64         Segment(const EntryType* first, const EntryType* last) {
65             _first = first; _last = last;
66         }
67         const EntryType* _first;
68         const EntryType* _last;
69     };
70
71     // discrete segment (opcode = 0)
72     template <typename EntryType>
73     class DiscreteSegment : public Segment<EntryType> {
74     public:
75         typedef typename Segment<EntryType>::SegmentMap SegmentMap;
76         DiscreteSegment(const EntryType* first)
77             : Segment<EntryType>(first, first+2+*(first+1)) {}
78         virtual bool Expand(const SegmentMap&,
79             std::vector<EntryType>& expanded) const
80         {
81             std::copy(this->_first + 2, this->_last, std::back_inserter(expanded));
82             return true;
83         }
84     };
85
86     // linear segment (opcode = 1)
87     template <typename EntryType>
88     class LinearSegment : public Segment<EntryType> {
89     public:
90         typedef typename Segment<EntryType>::SegmentMap SegmentMap;
91         LinearSegment(const EntryType* first)
92             : Segment<EntryType>(first, first+3) {}
93         virtual bool Expand(const SegmentMap&,
94             std::vector<EntryType>& expanded) const
95         {
96             if ( expanded.empty() ) {
97                 // linear segment can't be the first segment.
98                 return false;
99             }
100             EntryType length = *(this->_first + 1);
101             EntryType y0 = expanded.back();
102             EntryType y1 = *(this->_first + 2);
103             double y01 = y1 - y0;
104             for ( EntryType i = 0; i <length; ++i ) {
105                 double value_float
106                     = static_cast<double>(y0)
107                     + (static_cast<double>(i)/static_cast<double>(length)) * y01;
108                 EntryType value_int = static_cast<EntryType>(value_float + 0.5);
109                 expanded.push_back(value_int);
110             }
111             return true;
112         }
113     };
114
115     // indirect segment (opcode = 2)
116     template <typename EntryType>
117     class IndirectSegment : public Segment<EntryType> {
118     public:
119         typedef typename Segment<EntryType>::SegmentMap SegmentMap;
120         IndirectSegment(const EntryType* first)
121             : Segment<EntryType>(first, first+2+4/sizeof(EntryType)) {}
122         virtual bool Expand(const SegmentMap& instances,
123             std::vector<EntryType>& expanded) const
124         {
125             if ( instances.empty() ) {
126                 // some other segments are required as references.
127                 return false;
128             }
129             const EntryType* first_segment = instances.begin()->first;
130             const unsigned short* pOffset
131                 = reinterpret_cast<const unsigned short*>(this->_first + 2);
132             unsigned long offsetBytes
133                 = (*pOffset) | (static_cast<unsigned long>(*(pOffset + 1)) << 16);
134             const EntryType* copied_part_head
135                 = first_segment + offsetBytes / sizeof(EntryType);
136             typename SegmentMap::const_iterator ppHeadSeg = instances.find(copied_part_head);
137             if ( ppHeadSeg == instances.end() ) {
138                 // referred segment not found
139                 return false;
140             }
141             EntryType nNumCopies = *(this->_first + 1);
142             typename SegmentMap::const_iterator ppSeg = ppHeadSeg;
143             while ( std::distance(ppHeadSeg, ppSeg) < nNumCopies ) {
144                 assert( ppSeg != instances.end() );
145                 ppSeg->second->Expand(instances, expanded);
146                 ++ppSeg;
147             }
148             return true;
149         }
150     };
151
152     template <typename EntryType>
153     void ExpandPalette(const EntryType* raw_values, uint32_t length,
154         std::vector<EntryType>& palette)
155     {
156         typedef std::deque<Segment<EntryType>*> SegmentList;
157         SegmentList segments;
158         const EntryType* raw_seg = raw_values;
159         while ( (std::distance(raw_values, raw_seg) * sizeof(EntryType)) <length ) {
160             Segment<EntryType>* segment = NULL;
161             if ( *raw_seg == 0 ) {
162                 segment = new DiscreteSegment<EntryType>(raw_seg);
163             } else if ( *raw_seg == 1 ) {
164                 segment = new LinearSegment<EntryType>(raw_seg);
165             } else if ( *raw_seg == 2 ) {
166                 segment = new IndirectSegment<EntryType>(raw_seg);
167             }
168             if ( segment ) {
169                 segments.push_back(segment);
170                 raw_seg = segment->Last();
171             } else {
172                 // invalid opcode
173                 break;
174             }
175         }
176         typename Segment<EntryType>::SegmentMap instances;
177         std::transform(segments.begin(), segments.end(),
178             std::inserter(instances, instances.end()), typename Segment<EntryType>::ToMap());
179         typename SegmentList::iterator ppSeg = segments.begin();
180         typename SegmentList::iterator endOfSegments = segments.end();
181         for ( ; ppSeg != endOfSegments; ++ppSeg ) {
182             (*ppSeg)->Expand(instances, palette);
183         }
184         ppSeg = segments.begin();
185         for ( ; ppSeg != endOfSegments; ++ppSeg ) {
186             delete *ppSeg;
187         }
188     }
189
190     void ReadPaletteInto(GDCM_NAME_SPACE::File* pds, const GDCM_NAME_SPACE::TagKey& descriptor,
191       const GDCM_NAME_SPACE::TagKey& segment, uint8_t* lut)
192       {
193       unsigned int desc_values[3] = {};
194       unsigned long count = 0;
195       //if ( pds->findAndGetUint16Array(descriptor, desc_values, &count).good() )
196       std::string desc_values_str = pds->GetEntryString(descriptor.GetGroup(), descriptor.GetElement() );
197       count = sscanf( desc_values_str.c_str(), "%u\\%u\\%u", desc_values, desc_values+1, desc_values+2 );
198         {
199         assert( count == 3 );
200         unsigned int num_entries = desc_values[0];
201         if ( num_entries == 0 ) {
202           num_entries = 0x10000;
203         }
204         unsigned int min_pixel_value = desc_values[1];
205         assert( min_pixel_value == 0 ); // FIXME
206         unsigned int entry_size = desc_values[2];
207         assert( entry_size == 8 || entry_size == 16 );
208         //DcmElement* pe = NULL;
209         GDCM_NAME_SPACE::DataEntry* pe = NULL;
210
211         pe = pds->GetDataEntry(segment.GetGroup(), segment.GetElement() );
212           {
213           //if ( pds->findAndGetElement(segment, pe).good() )
214           unsigned long length = pe->GetLength();
215           if ( entry_size == 8 )
216             {
217             uint8_t* segment_values = NULL;
218             //if ( pe->getUint8Array(segment_values).good() )
219             segment_values = (uint8_t*)pe->GetBinArea();
220               {
221               std::vector<uint8_t> palette;
222               palette.reserve(num_entries);
223               ExpandPalette(segment_values, length, palette);
224               memcpy(lut, &palette[0], palette.size() );
225               }
226             } 
227           else if ( entry_size == 16 ) 
228             {
229             uint16_t* segment_values = NULL;
230             segment_values = (uint16_t*)pe->GetBinArea();
231               {
232               //if ( pe->getUint16Array(segment_values).good() )
233               std::vector<uint16_t> palette;
234               palette.reserve(num_entries);
235               ExpandPalette(segment_values, length, palette);
236               memcpy(lut, &palette[0], palette.size()*2 );
237
238               }
239             }
240           }
241         }
242       }
243 } // end namespace gdcm
244
245
246 #endif