]> Creatis software - gdcm.git/blob - src/gdcmSegmentedPalette.h
ENH: gdcm is not called gdcm anymore...
[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 12:02:55 $
7   Version:   $Revision: 1.7 $
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 #include <assert.h>
36 #include <algorithm>
37 #include <deque>
38 #include <map>
39 #include <vector>
40 #include <iterator>
41
42 namespace GDCM_NAME_SPACE
43 {
44     // abstract class for segment.
45     template <typename EntryType>
46     class Segment {
47     public:
48         typedef std::map<const EntryType*, const Segment*> SegmentMap;
49         virtual bool Expand(const SegmentMap& instances,
50             std::vector<EntryType>& expanded) const = 0;
51         const EntryType* First() const { return _first; }
52         const EntryType* Last() const { return _last; }
53         struct ToMap {
54             std::pair<
55                 typename SegmentMap::key_type,
56                 typename SegmentMap::mapped_type
57             >
58                 operator()(const Segment* segment) const
59             { return std::make_pair(segment->First(), segment); }
60         };
61     protected:
62         Segment(const EntryType* first, const EntryType* last) {
63             _first = first; _last = last;
64         }
65         const EntryType* _first;
66         const EntryType* _last;
67     };
68
69     // discrete segment (opcode = 0)
70     template <typename EntryType>
71     class DiscreteSegment : public Segment<EntryType> {
72     public:
73         typedef typename Segment<EntryType>::SegmentMap SegmentMap;
74         DiscreteSegment(const EntryType* first)
75             : Segment<EntryType>(first, first+2+*(first+1)) {}
76         virtual bool Expand(const SegmentMap&,
77             std::vector<EntryType>& expanded) const
78         {
79             std::copy(this->_first + 2, this->_last, std::back_inserter(expanded));
80             return true;
81         }
82     };
83
84     // linear segment (opcode = 1)
85     template <typename EntryType>
86     class LinearSegment : public Segment<EntryType> {
87     public:
88         typedef typename Segment<EntryType>::SegmentMap SegmentMap;
89         LinearSegment(const EntryType* first)
90             : Segment<EntryType>(first, first+3) {}
91         virtual bool Expand(const SegmentMap&,
92             std::vector<EntryType>& expanded) const
93         {
94             if ( expanded.empty() ) {
95                 // linear segment can't be the first segment.
96                 return false;
97             }
98             EntryType length = *(this->_first + 1);
99             EntryType y0 = expanded.back();
100             EntryType y1 = *(this->_first + 2);
101             double y01 = y1 - y0;
102             for ( EntryType i = 0; i <length; ++i ) {
103                 double value_float
104                     = static_cast<double>(y0)
105                     + (static_cast<double>(i)/static_cast<double>(length)) * y01;
106                 EntryType value_int = static_cast<EntryType>(value_float + 0.5);
107                 expanded.push_back(value_int);
108             }
109             return true;
110         }
111     };
112
113     // indirect segment (opcode = 2)
114     template <typename EntryType>
115     class IndirectSegment : public Segment<EntryType> {
116     public:
117         typedef typename Segment<EntryType>::SegmentMap SegmentMap;
118         IndirectSegment(const EntryType* first)
119             : Segment<EntryType>(first, first+2+4/sizeof(EntryType)) {}
120         virtual bool Expand(const SegmentMap& instances,
121             std::vector<EntryType>& expanded) const
122         {
123             if ( instances.empty() ) {
124                 // some other segments are required as references.
125                 return false;
126             }
127             const EntryType* first_segment = instances.begin()->first;
128             const unsigned short* pOffset
129                 = reinterpret_cast<const unsigned short*>(this->_first + 2);
130             unsigned long offsetBytes
131                 = (*pOffset) | (static_cast<unsigned long>(*(pOffset + 1)) << 16);
132             const EntryType* copied_part_head
133                 = first_segment + offsetBytes / sizeof(EntryType);
134             typename SegmentMap::const_iterator ppHeadSeg = instances.find(copied_part_head);
135             if ( ppHeadSeg == instances.end() ) {
136                 // referred segment not found
137                 return false;
138             }
139             EntryType nNumCopies = *(this->_first + 1);
140             typename SegmentMap::const_iterator ppSeg = ppHeadSeg;
141             while ( std::distance(ppHeadSeg, ppSeg) < nNumCopies ) {
142                 assert( ppSeg != instances.end() );
143                 ppSeg->second->Expand(instances, expanded);
144                 ++ppSeg;
145             }
146             return true;
147         }
148     };
149
150     template <typename EntryType>
151     void ExpandPalette(const EntryType* raw_values, uint32_t length,
152         std::vector<EntryType>& palette)
153     {
154         typedef std::deque<Segment<EntryType>*> SegmentList;
155         SegmentList segments;
156         const EntryType* raw_seg = raw_values;
157         while ( (std::distance(raw_values, raw_seg) * sizeof(EntryType)) <length ) {
158             Segment<EntryType>* segment = NULL;
159             if ( *raw_seg == 0 ) {
160                 segment = new DiscreteSegment<EntryType>(raw_seg);
161             } else if ( *raw_seg == 1 ) {
162                 segment = new LinearSegment<EntryType>(raw_seg);
163             } else if ( *raw_seg == 2 ) {
164                 segment = new IndirectSegment<EntryType>(raw_seg);
165             }
166             if ( segment ) {
167                 segments.push_back(segment);
168                 raw_seg = segment->Last();
169             } else {
170                 // invalid opcode
171                 break;
172             }
173         }
174         typename Segment<EntryType>::SegmentMap instances;
175         std::transform(segments.begin(), segments.end(),
176             std::inserter(instances, instances.end()), typename Segment<EntryType>::ToMap());
177         typename SegmentList::iterator ppSeg = segments.begin();
178         typename SegmentList::iterator endOfSegments = segments.end();
179         for ( ; ppSeg != endOfSegments; ++ppSeg ) {
180             (*ppSeg)->Expand(instances, palette);
181         }
182         ppSeg = segments.begin();
183         for ( ; ppSeg != endOfSegments; ++ppSeg ) {
184             delete *ppSeg;
185         }
186     }
187
188     void ReadPaletteInto(GDCM_NAME_SPACE::File* pds, const GDCM_NAME_SPACE::TagKey& descriptor,
189       const GDCM_NAME_SPACE::TagKey& segment, uint8_t* lut)
190       {
191       unsigned int desc_values[3] = {};
192       unsigned long count = 0;
193       //if ( pds->findAndGetUint16Array(descriptor, desc_values, &count).good() )
194       std::string desc_values_str = pds->GetEntryString(descriptor.GetGroup(), descriptor.GetElement() );
195       count = sscanf( desc_values_str.c_str(), "%u\\%u\\%u", desc_values, desc_values+1, desc_values+2 );
196         {
197         assert( count == 3 );
198         unsigned int num_entries = desc_values[0];
199         if ( num_entries == 0 ) {
200           num_entries = 0x10000;
201         }
202         unsigned int min_pixel_value = desc_values[1];
203         assert( min_pixel_value == 0 ); // FIXME
204         unsigned int entry_size = desc_values[2];
205         assert( entry_size == 8 || entry_size == 16 );
206         //DcmElement* pe = NULL;
207         GDCM_NAME_SPACE::DataEntry* pe = NULL;
208
209         pe = pds->GetDataEntry(segment.GetGroup(), segment.GetElement() ); {
210           //if ( pds->findAndGetElement(segment, pe).good() )
211           unsigned long length = pe->GetLength();
212           if ( entry_size == 8 ) {
213             uint8_t* segment_values = NULL;
214             //if ( pe->getUint8Array(segment_values).good() )
215             segment_values = (uint8_t*)pe->GetBinArea(); {
216               std::vector<uint8_t> palette;
217               palette.reserve(num_entries);
218               ExpandPalette(segment_values, length, palette);
219               memcpy(lut, &palette[0], palette.size() );
220             }
221           } else if ( entry_size == 16 ) {
222             uint16_t* segment_values = NULL;
223             segment_values = (uint16_t*)pe->GetBinArea(); {
224               //if ( pe->getUint16Array(segment_values).good() )
225               std::vector<uint16_t> palette;
226               palette.reserve(num_entries);
227               ExpandPalette(segment_values, length, palette);
228               memcpy(lut, &palette[0], palette.size()*2 );
229 //              std::copy(palette.begin(), palette.end(), 
230 //                std::ostream_iterator<uint16_t>(std::cout, "\n"));
231
232             }
233           }
234         }
235         }
236       }
237 } // end namespace gdcm
238
239
240 #endif