1 /*=========================================================================
4 Module: $RCSfile: gdcmPixelConvert.cxx,v $
6 Date: $Date: 2004/10/25 17:07:16 $
7 Version: $Revision: 1.21 $
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.
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.
17 =========================================================================*/
19 ////////////////// TEMPORARY NOTE
20 // look for "fixMem" and convert that to a member of this class
21 // Removing the prefix fixMem and dealing with allocations should do the trick
23 // grep PIXELCONVERT everywhere and clean up !
25 #include "gdcmDebug.h"
26 #include "gdcmPixelConvert.h"
32 #define str2num(str, typeNum) *((typeNum *)(str))
34 // For JPEG 2000, body in file gdcmJpeg2000.cxx
35 bool gdcm_read_JPEG2000_file (std::ifstream* fp, void* image_buffer);
37 // For JPEG 8 Bits, body in file gdcmJpeg8.cxx
38 bool gdcm_read_JPEG_file8 (std::ifstream* fp, void* image_buffer);
40 // For JPEG 12 Bits, body in file gdcmJpeg12.cxx
41 bool gdcm_read_JPEG_file12 (std::ifstream* fp, void* image_buffer);
43 // For JPEG 16 Bits, body in file gdcmJpeg16.cxx
44 // Beware this is misleading there is no 16bits DCT algorithm, only
45 // jpeg lossless compression exist in 16bits.
46 bool gdcm_read_JPEG_file16 (std::ifstream* fp, void* image_buffer);
49 //-----------------------------------------------------------------------------
50 // Constructor / Destructor
51 PixelConvert::PixelConvert()
63 void PixelConvert::Squeeze()
71 delete [] Decompressed;
79 PixelConvert::~PixelConvert()
84 void PixelConvert::AllocateRGB()
89 RGB = new uint8_t[ RGBSize ];
92 void PixelConvert::AllocateDecompressed()
95 delete [] Decompressed;
97 Decompressed = new uint8_t[ DecompressedSize ];
101 * \brief Read from file a 12 bits per pixel image and decompress it
102 * into a 16 bits per pixel image.
104 void PixelConvert::ReadAndDecompress12BitsTo16Bits( std::ifstream* fp )
105 throw ( FormatError )
107 int nbPixels = XSize * YSize;
108 uint16_t* localDecompres = (uint16_t*)Decompressed;
110 for( int p = 0; p < nbPixels; p += 2 )
114 fp->read( (char*)&b0, 1);
115 if ( fp->fail() || fp->eof() )//Fp->gcount() == 1
117 throw FormatError( "PixelConvert::ReadAndDecompress12BitsTo16Bits()",
118 "Unfound first block" );
121 fp->read( (char*)&b1, 1 );
122 if ( fp->fail() || fp->eof())//Fp->gcount() == 1
124 throw FormatError( "PixelConvert::ReadAndDecompress12BitsTo16Bits()",
125 "Unfound second block" );
128 fp->read( (char*)&b2, 1 );
129 if ( fp->fail() || fp->eof())//Fp->gcount() == 1
131 throw FormatError( "PixelConvert::ReadAndDecompress12BitsTo16Bits()",
132 "Unfound second block" );
135 // Two steps are necessary to please VC++
137 // 2 pixels 12bit = [0xABCDEF]
138 // 2 pixels 16bit = [0x0ABD] + [0x0FCE]
140 *localDecompres++ = ((b0 >> 4) << 8) + ((b0 & 0x0f) << 4) + (b1 & 0x0f);
142 *localDecompres++ = ((b2 & 0x0f) << 8) + ((b1 >> 4) << 4) + (b2 >> 4);
144 /// \todo JPR Troubles expected on Big-Endian processors ?
149 * \brief Try to deal with RLE 16 Bits.
150 * We assume the RLE has allready been parsed and loaded in
151 * Decompressed (through \ref ReadAndDecompressJPEGFile ).
152 * We here need to make 16 Bits Pixels from Low Byte and
153 * High Byte 'Planes'...(for what it may mean)
156 bool PixelConvert::DecompressRLE16BitsFromRLE8Bits( int NumberOfFrames )
158 size_t PixelNumber = XSize * YSize;
159 size_t decompressedSize = XSize * YSize * NumberOfFrames;
161 // We assumed Decompressed contains the decoded RLE pixels but as
162 // 8 bits per pixel. In order to convert those pixels to 16 bits
163 // per pixel we cannot work in place within Decompressed and hence
164 // we copy it in a safe place, say copyDecompressed.
166 uint8_t* copyDecompressed = new uint8_t[ decompressedSize * 2 ];
167 memmove( copyDecompressed, Decompressed, decompressedSize * 2 );
169 uint8_t* x = Decompressed;
170 uint8_t* a = copyDecompressed;
171 uint8_t* b = a + PixelNumber;
173 for ( int i = 0; i < NumberOfFrames; i++ )
175 for ( unsigned int j = 0; j < PixelNumber; j++ )
182 delete[] copyDecompressed;
184 /// \todo check that operator new []didn't fail, and sometimes return false
189 * \brief Implementation of the RLE decoding algorithm for decompressing
190 * a RLE fragment. [refer to PS 3.5-2003, section G.3.2 p 86]
191 * @param subDecompressed Sub region of \ref Decompressed where the de
192 * decoded fragment should be placed.
193 * @param fragmentSize The length of the binary fragment as found on the disk.
194 * @param decompressedSegmentSize The expected length of the fragment ONCE
196 * @param fp File Pointer: on entry the position should be the one of
197 * the fragment to be decoded.
199 bool PixelConvert::ReadAndDecompressRLEFragment( uint8_t* subDecompressed,
201 long decompressedSegmentSize,
205 long numberOfOutputBytes = 0;
206 long numberOfReadBytes = 0;
208 while( numberOfOutputBytes < decompressedSegmentSize )
210 fp->read( (char*)&count, 1 );
211 numberOfReadBytes += 1;
213 // Note: count <= 127 comparison is always true due to limited range
214 // of data type int8_t [since the maximum of an exact width
215 // signed integer of width N is 2^(N-1) - 1, which for int8_t
218 fp->read( (char*)subDecompressed, count + 1);
219 numberOfReadBytes += count + 1;
220 subDecompressed += count + 1;
221 numberOfOutputBytes += count + 1;
225 if ( ( count <= -1 ) && ( count >= -127 ) )
228 fp->read( (char*)&newByte, 1);
229 numberOfReadBytes += 1;
230 for( int i = 0; i < -count + 1; i++ )
232 subDecompressed[i] = newByte;
234 subDecompressed += -count + 1;
235 numberOfOutputBytes += -count + 1;
238 // if count = 128 output nothing
240 if ( numberOfReadBytes > fragmentSize )
242 dbg.Verbose(0, "PixelConvert::ReadAndDecompressRLEFragment: we "
243 "read more bytes than the segment size.");
251 * \brief Reads from disk the Pixel Data of 'Run Length Encoded'
252 * Dicom encapsulated file and decompress it.
253 * @param fp already open File Pointer
254 * at which the pixel data should be copied
257 bool PixelConvert::ReadAndDecompressRLEFile( std::ifstream* fp )
259 uint8_t* subDecompressed = Decompressed;
260 long decompressedSegmentSize = XSize * YSize;
262 // Loop on the frame[s]
263 for( RLEFramesInfo::RLEFrameList::iterator
264 it = RLEInfo->Frames.begin();
265 it != RLEInfo->Frames.end();
268 // Loop on the fragments
269 for( unsigned int k = 1; k <= (*it)->NumberFragments; k++ )
271 //fseek( fp, (*it)->Offset[k] ,SEEK_SET );
272 fp->seekg( (*it)->Offset[k] , std::ios_base::beg );
273 (void)ReadAndDecompressRLEFragment( subDecompressed,
275 decompressedSegmentSize,
277 subDecompressed += decompressedSegmentSize;
281 if ( BitsAllocated == 16 )
283 // Try to deal with RLE 16 Bits
284 (void)DecompressRLE16BitsFromRLE8Bits( ZSize );
291 * \brief Swap the bytes, according to \ref SwapCode.
293 void PixelConvert::ConvertSwapZone()
297 if( BitsAllocated == 16 )
299 uint16_t* im16 = (uint16_t*)Decompressed;
310 for( i = 0; i < DecompressedSize / 2; i++ )
312 im16[i]= (im16[i] >> 8) | (im16[i] << 8 );
316 dbg.Verbose( 0, "PixelConvert::ConvertSwapZone: SwapCode value "
317 "(16 bits) not allowed." );
320 else if( BitsAllocated == 32 )
325 uint32_t* im32 = (uint32_t*)Decompressed;
332 for( i = 0; i < DecompressedSize / 4; i++ )
334 low = im32[i] & 0x0000ffff; // 4321
335 high = im32[i] >> 16;
336 high = ( high >> 8 ) | ( high << 8 );
337 low = ( low >> 8 ) | ( low << 8 );
339 im32[i] = ( s32 << 16 ) | high;
343 for( i = 0; i < DecompressedSize / 4; i++ )
345 low = im32[i] & 0x0000ffff; // 2143
346 high = im32[i] >> 16;
347 high = ( high >> 8 ) | ( high << 8 );
348 low = ( low >> 8 ) | ( low << 8 );
350 im32[i] = ( s32 << 16 ) | low;
354 for( i = 0; i < DecompressedSize / 4; i++ )
356 low = im32[i] & 0x0000ffff; // 3412
357 high = im32[i] >> 16;
359 im32[i] = ( s32 << 16 ) | high;
363 dbg.Verbose( 0, "PixelConvert::ConvertSwapZone: SwapCode value "
364 "(32 bits) not allowed." );
370 * \brief Deal with endianity i.e. re-arange bytes inside the integer
372 void PixelConvert::ConvertReorderEndianity()
374 if ( BitsAllocated != 8 )
379 // Special kludge in order to deal with xmedcon broken images:
380 if ( ( BitsAllocated == 16 )
381 && ( BitsStored < BitsAllocated )
384 int l = (int)( DecompressedSize / ( BitsAllocated / 8 ) );
385 uint16_t *deb = (uint16_t *)Decompressed;
386 for(int i = 0; i<l; i++)
398 * \brief Reads from disk the Pixel Data of JPEG Dicom encapsulated
399 & file and decompress it.
400 * @param fp File Pointer
403 bool PixelConvert::ReadAndDecompressJPEGFile( std::ifstream* fp )
405 uint8_t* localDecompressed = Decompressed;
406 // Loop on the fragment[s]
407 for( JPEGFragmentsInfo::JPEGFragmentsList::iterator
408 it = JPEGInfo->Fragments.begin();
409 it != JPEGInfo->Fragments.end();
412 //fseek( fp, (*it)->Offset, SEEK_SET );
413 fp->seekg( (*it)->Offset, std::ios_base::beg);
417 if ( ! gdcm_read_JPEG2000_file( fp,localDecompressed ) )
422 else if ( BitsStored == 8)
424 // JPEG Lossy : call to IJG 6b
425 if ( ! gdcm_read_JPEG_file8( fp, localDecompressed ) )
430 else if ( BitsStored == 12)
432 // Reading Fragment pixels
433 if ( ! gdcm_read_JPEG_file12 ( fp, localDecompressed ) )
438 else if ( BitsStored == 16)
440 // Reading Fragment pixels
441 if ( ! gdcm_read_JPEG_file16 ( fp, localDecompressed ) )
445 //assert( IsJPEGLossless );
449 // other JPEG lossy not supported
450 dbg.Error("PixelConvert::ReadAndDecompressJPEGFile: unknown "
451 "jpeg lossy compression ");
455 // Advance to next free location in Decompressed
456 // for next fragment decompression (if any)
457 int length = XSize * YSize * SamplesPerPixel;
458 int numberBytes = BitsAllocated / 8;
460 localDecompressed += length * numberBytes;
466 * \brief Re-arrange the bits within the bytes.
469 bool PixelConvert::ConvertReArrangeBits() throw ( FormatError )
471 if ( BitsStored != BitsAllocated )
473 int l = (int)( DecompressedSize / ( BitsAllocated / 8 ) );
474 if ( BitsAllocated == 16 )
476 uint16_t mask = 0xffff;
477 mask = mask >> ( BitsAllocated - BitsStored );
478 uint16_t* deb = (uint16_t*)Decompressed;
479 for(int i = 0; i<l; i++)
481 *deb = (*deb >> (BitsStored - HighBitPosition - 1)) & mask;
485 else if ( BitsAllocated == 32 )
487 uint32_t mask = 0xffffffff;
488 mask = mask >> ( BitsAllocated - BitsStored );
489 uint32_t* deb = (uint32_t*)Decompressed;
490 for(int i = 0; i<l; i++)
492 *deb = (*deb >> (BitsStored - HighBitPosition - 1)) & mask;
498 dbg.Verbose(0, "PixelConvert::ConvertReArrangeBits: weird image");
499 throw FormatError( "PixelConvert::ConvertReArrangeBits()",
507 * \brief Convert (Y plane, cB plane, cR plane) to RGB pixels
508 * \warning Works on all the frames at a time
510 void PixelConvert::ConvertYcBcRPlanesToRGBPixels()
512 uint8_t* localDecompressed = Decompressed;
513 uint8_t* copyDecompressed = new uint8_t[ DecompressedSize ];
514 memmove( copyDecompressed, localDecompressed, DecompressedSize );
516 // to see the tricks about YBR_FULL, YBR_FULL_422,
517 // YBR_PARTIAL_422, YBR_ICT, YBR_RCT have a look at :
518 // ftp://medical.nema.org/medical/dicom/final/sup61_ft.pdf
519 // and be *very* affraid
521 int l = XSize * YSize;
522 int nbFrames = ZSize;
524 uint8_t* a = copyDecompressed;
525 uint8_t* b = copyDecompressed + l;
526 uint8_t* c = copyDecompressed + l + l;
529 /// \todo : Replace by the 'well known' integer computation
530 /// counterpart. Refer to
531 /// http://lestourtereaux.free.fr/papers/data/yuvrgb.pdf
532 /// for code optimisation.
534 for ( int i = 0; i < nbFrames; i++ )
536 for ( int j = 0; j < l; j++ )
538 R = 1.164 *(*a-16) + 1.596 *(*c -128) + 0.5;
539 G = 1.164 *(*a-16) - 0.813 *(*c -128) - 0.392 *(*b -128) + 0.5;
540 B = 1.164 *(*a-16) + 2.017 *(*b -128) + 0.5;
542 if (R < 0.0) R = 0.0;
543 if (G < 0.0) G = 0.0;
544 if (B < 0.0) B = 0.0;
545 if (R > 255.0) R = 255.0;
546 if (G > 255.0) G = 255.0;
547 if (B > 255.0) B = 255.0;
549 *(localDecompressed++) = (uint8_t)R;
550 *(localDecompressed++) = (uint8_t)G;
551 *(localDecompressed++) = (uint8_t)B;
557 delete[] copyDecompressed;
561 * \brief Convert (Red plane, Green plane, Blue plane) to RGB pixels
562 * \warning Works on all the frames at a time
564 void PixelConvert::ConvertRGBPlanesToRGBPixels()
566 uint8_t* localDecompressed = Decompressed;
567 uint8_t* copyDecompressed = new uint8_t[ DecompressedSize ];
568 memmove( copyDecompressed, localDecompressed, DecompressedSize );
570 int l = XSize * YSize * ZSize;
572 uint8_t* a = copyDecompressed;
573 uint8_t* b = copyDecompressed + l;
574 uint8_t* c = copyDecompressed + l + l;
576 for (int j = 0; j < l; j++)
578 *(localDecompressed++) = *(a++);
579 *(localDecompressed++) = *(b++);
580 *(localDecompressed++) = *(c++);
582 delete[] copyDecompressed;
585 bool PixelConvert::ReadAndDecompressPixelData( std::ifstream* fp )
587 ComputeDecompressedAndRGBSizes();
588 AllocateDecompressed();
589 //////////////////////////////////////////////////
590 //// First stage: get our hands on the Pixel Data.
593 dbg.Verbose( 0, "PixelConvert::ReadAndDecompressPixelData: "
594 "unavailable file pointer." );
598 //if ( fseek( fp, PixelOffset, SEEK_SET ) == -1 )
599 fp->seekg( PixelOffset, std::ios_base::beg );
600 if( fp->fail() || fp->eof()) //Fp->gcount() == 1
602 dbg.Verbose( 0, "PixelConvert::ReadAndDecompressPixelData: "
603 "unable to find PixelOffset in file." );
607 //////////////////////////////////////////////////
608 //// Second stage: read from disk dans decompress.
609 if ( BitsAllocated == 12 )
611 ReadAndDecompress12BitsTo16Bits( fp);
613 else if ( IsDecompressed )
615 fp->read( (char*)Decompressed, PixelDataLength);
616 if ( fp->fail() || fp->eof())//Fp->gcount() == 1
618 dbg.Verbose( 0, "PixelConvert::ReadAndDecompressPixelData: "
619 "reading of decompressed pixel data failed." );
623 else if ( IsRLELossless )
625 if ( ! ReadAndDecompressRLEFile( fp ) )
627 dbg.Verbose( 0, "PixelConvert::ReadAndDecompressPixelData: "
628 "RLE decompressor failed." );
634 // Default case concerns JPEG family
635 if ( ! ReadAndDecompressJPEGFile( fp ) )
637 dbg.Verbose( 0, "PixelConvert::ReadAndDecompressPixelData: "
638 "JPEG decompressor failed." );
643 ////////////////////////////////////////////
644 //// Third stage: twigle the bytes and bits.
645 ConvertReorderEndianity();
646 ConvertReArrangeBits();
647 ConvertHandleColor();
652 void PixelConvert::ConvertHandleColor()
654 //////////////////////////////////
655 // Deal with the color decoding i.e. handle:
656 // - R, G, B planes (as opposed to RGB pixels)
657 // - YBR (various) encodings.
658 // - LUT[s] (or "PALETTE COLOR").
660 // The classification in the color decoding schema is based on the blending
661 // of two Dicom tags values:
662 // * "Photometric Interpretation" for which we have the cases:
663 // - [Photo A] MONOCHROME[1|2] pictures,
664 // - [Photo B] RGB or YBR_FULL_422 (which acts as RGB),
665 // - [Photo C] YBR_* (with the above exception of YBR_FULL_422)
666 // - [Photo D] "PALETTE COLOR" which indicates the presence of LUT[s].
667 // * "Planar Configuration" for which we have the cases:
668 // - [Planar 0] 0 then Pixels are already RGB
669 // - [Planar 1] 1 then we have 3 planes : R, G, B,
670 // - [Planar 2] 2 then we have 1 gray Plane and 3 LUTs
672 // Now in theory, one could expect some coherence when blending the above
673 // cases. For example we should not encounter files belonging at the
674 // time to case [Planar 0] and case [Photo D].
675 // Alas, this was only theory ! Because in practice some odd (read ill
676 // formated Dicom) files (e.g. gdcmData/US-PAL-8-10x-echo.dcm) we encounter:
677 // - "Planar Configuration" = 0,
678 // - "Photometric Interpretation" = "PALETTE COLOR".
679 // Hence gdcm shall use the folowing "heuristic" in order to be tolerant
680 // towards Dicom-non-conformance files:
681 // << whatever the "Planar Configuration" value might be, a
682 // "Photometric Interpretation" set to "PALETTE COLOR" forces
683 // a LUT intervention >>
685 // Now we are left with the following handling of the cases:
686 // - [Planar 0] OR [Photo A] no color decoding (since respectively
687 // Pixels are already RGB and monochrome pictures have no color :),
688 // - [Planar 1] AND [Photo B] handled with ConvertRGBPlanesToRGBPixels()
689 // - [Planar 1] AND [Photo C] handled with ConvertYcBcRPlanesToRGBPixels()
690 // - [Planar 2] OR [Photo D] requires LUT intervention.
692 if ( ! IsDecompressedRGB() )
694 // [Planar 2] OR [Photo D]: LUT intervention done outside
698 if ( PlanarConfiguration == 1 )
702 // [Planar 1] AND [Photo C] (remember YBR_FULL_422 acts as RGB)
703 ConvertYcBcRPlanesToRGBPixels();
707 // [Planar 1] AND [Photo C]
708 ConvertRGBPlanesToRGBPixels();
713 // When planarConf is 0, and RLELossless (forbidden by Dicom norm)
714 // pixels need to be RGB-fied anyway
717 ConvertRGBPlanesToRGBPixels();
719 // In *normal *case, when planarConf is 0, pixels are already in RGB
723 * \brief Predicate to know wether the image[s] (once decompressed) is RGB.
724 * \note See comments of \ref ConvertHandleColor
726 bool PixelConvert::IsDecompressedRGB()
729 || ( PlanarConfiguration == 2 )
737 void PixelConvert::ComputeDecompressedAndRGBSizes()
739 int bitsAllocated = BitsAllocated;
740 // Number of "Bits Allocated" is fixed to 16 when it's 12, since
741 // in this case we will expand the image to 16 bits (see
742 // \ref ReadAndDecompress12BitsTo16Bits() )
743 if ( BitsAllocated == 12 )
748 DecompressedSize = XSize * YSize * ZSize
749 * ( bitsAllocated / 8 )
753 RGBSize = 3 * DecompressedSize;
758 void PixelConvert::GrabInformationsFromHeader( Header* header )
760 // Just in case some access to a Header element requires disk access.
761 // Note: gdcmDocument::Fp is leaved open after OpenFile.
762 std::ifstream* fp = header->OpenFile();
763 // Number of Bits Allocated for storing a Pixel is defaulted to 16
764 // when absent from the header.
765 BitsAllocated = header->GetBitsAllocated();
766 if ( BitsAllocated == 0 )
771 // Number of "Bits Stored" defaulted to number of "Bits Allocated"
772 // when absent from the header.
773 BitsStored = header->GetBitsStored();
774 if ( BitsStored == 0 )
776 BitsStored = BitsAllocated;
780 HighBitPosition = header->GetHighBitPosition();
781 if ( HighBitPosition == 0 )
783 HighBitPosition = BitsAllocated - 1;
786 XSize = header->GetXSize();
787 YSize = header->GetYSize();
788 ZSize = header->GetZSize();
789 SamplesPerPixel = header->GetSamplesPerPixel();
790 PixelSize = header->GetPixelSize();
791 PixelSign = header->IsSignedPixelData();
792 SwapCode = header->GetSwapCode();
793 TransferSyntaxType ts = header->GetTransferSyntax();
795 ( ! header->IsDicomV3() )
796 || ts == ImplicitVRLittleEndian
797 || ts == ExplicitVRLittleEndian
798 || ts == ExplicitVRBigEndian
799 || ts == DeflatedExplicitVRLittleEndian;
800 IsJPEG2000 = header->IsJPEG2000();
801 IsJPEGLossless = header->IsJPEGLossless();
802 IsRLELossless = ( ts == RLELossless );
803 PixelOffset = header->GetPixelOffset();
804 PixelDataLength = header->GetPixelAreaLength();
805 RLEInfo = header->GetRLEInfo();
806 JPEGInfo = header->GetJPEGInfo();
808 PlanarConfiguration = header->GetPlanarConfiguration();
809 IsMonochrome = header->IsMonochrome();
810 IsPaletteColor = header->IsPaletteColor();
811 IsYBRFull = header->IsYBRFull();
813 /////////////////////////////////////////////////////////////////
815 HasLUT = header->HasLUT();
818 LutRedDescriptor = header->GetEntryByNumber( 0x0028, 0x1101 );
819 LutGreenDescriptor = header->GetEntryByNumber( 0x0028, 0x1102 );
820 LutBlueDescriptor = header->GetEntryByNumber( 0x0028, 0x1103 );
822 // Depending on the value of Document::MAX_SIZE_LOAD_ELEMENT_VALUE
823 // [ refer to invocation of Document::SetMaxSizeLoadEntry() in
824 // Document::Document() ], the loading of the value (content) of a
825 // [Bin|Val]Entry occurence migth have been hindered (read simply NOT
826 // loaded). Hence, we first try to obtain the LUTs data from the header
827 // and when this fails we read the LUTs data directely from disk.
828 /// \todo Reading a [Bin|Val]Entry directly from disk is a kludge.
829 /// We should NOT bypass the [Bin|Val]Entry class. Instead
830 /// an access to an UNLOADED content of a [Bin|Val]Entry occurence
831 /// (e.g. BinEntry::GetBinArea()) should force disk access from
832 /// within the [Bin|Val]Entry class itself. The only problem
833 /// is that the [Bin|Val]Entry is unaware of the FILE* is was
834 /// parsed from. Fix that. FIXME.
837 LutRedData = (uint8_t*)header->GetEntryBinAreaByNumber( 0x0028, 0x1201 );
840 // Read the Lut Data from disk
841 DocEntry* lutRedDataEntry = header->GetDocEntryByNumber( 0x0028,
843 LutRedData = new uint8_t[ lutRedDataEntry->GetLength() ];
844 //fseek( fp, lutRedDataEntry->GetOffset() ,SEEK_SET );
845 fp->seekg( lutRedDataEntry->GetOffset() ,std::ios_base::beg );
846 fp->read( (char*)LutRedData, (size_t)lutRedDataEntry->GetLength());
847 //if ( numberItem != 1 )
848 if ( fp->fail() || fp->eof())//Fp->gcount() == 1
850 dbg.Verbose(0, "PixelConvert::GrabInformationsFromHeader: "
851 "unable to read red LUT data" );
857 LutGreenData = (uint8_t*)header->GetEntryBinAreaByNumber(0x0028, 0x1202 );
860 // Read the Lut Data from disk
861 DocEntry* lutGreenDataEntry = header->GetDocEntryByNumber( 0x0028,
863 LutGreenData = new uint8_t[ lutGreenDataEntry->GetLength() ];
864 //fseek( fp, lutGreenDataEntry->GetOffset() ,SEEK_SET );
865 fp->seekg( lutGreenDataEntry->GetOffset() , std::ios_base::beg );
866 fp->read( (char*)LutGreenData, (size_t)lutGreenDataEntry->GetLength() );
867 //if ( numberItem != 1 )
868 if ( fp->fail() || fp->eof())//Fp->gcount() == 1
870 dbg.Verbose(0, "PixelConvert::GrabInformationsFromHeader: "
871 "unable to read green LUT data" );
877 LutBlueData = (uint8_t*)header->GetEntryBinAreaByNumber( 0x0028, 0x1203 );
880 // Read the Lut Data from disk
881 DocEntry* lutBlueDataEntry = header->GetDocEntryByNumber( 0x0028,
883 LutBlueData = new uint8_t[ lutBlueDataEntry->GetLength() ];
884 //fseek( fp, lutBlueDataEntry->GetOffset() ,SEEK_SET );
885 fp->seekg( lutBlueDataEntry->GetOffset() , std::ios_base::beg );
886 fp->read( (char*)LutBlueData, (size_t)lutBlueDataEntry->GetLength() );
887 //if ( numberItem != 1 )
888 if ( fp->fail() || fp->eof())//Fp->gcount() == 1
890 dbg.Verbose(0, "PixelConvert::GrabInformationsFromHeader: "
891 "unable to read blue LUT data" );
901 * \brief Build Red/Green/Blue/Alpha LUT from Header
902 * when (0028,0004),Photometric Interpretation = [PALETTE COLOR ]
903 * and (0028,1101),(0028,1102),(0028,1102)
904 * - xxx Palette Color Lookup Table Descriptor - are found
905 * and (0028,1201),(0028,1202),(0028,1202)
906 * - xxx Palette Color Lookup Table Data - are found
907 * \warning does NOT deal with :
908 * 0028 1100 Gray Lookup Table Descriptor (Retired)
909 * 0028 1221 Segmented Red Palette Color Lookup Table Data
910 * 0028 1222 Segmented Green Palette Color Lookup Table Data
911 * 0028 1223 Segmented Blue Palette Color Lookup Table Data
912 * no known Dicom reader deals with them :-(
913 * @return a RGBA Lookup Table
915 void PixelConvert::BuildLUTRGBA()
922 // http://www.barre.nom.fr/medical/dicom2/limitations.html#Color%20Lookup%20Tables
924 if ( ! IsPaletteColor )
929 if ( ( LutRedDescriptor == GDCM_UNFOUND )
930 || ( LutGreenDescriptor == GDCM_UNFOUND )
931 || ( LutBlueDescriptor == GDCM_UNFOUND ) )
936 ////////////////////////////////////////////
937 // Extract the info from the LUT descriptors
938 int lengthR; // Red LUT length in Bytes
939 int debR; // Subscript of the first Lut Value
940 int nbitsR; // Lut item size (in Bits)
941 int nbRead = sscanf( LutRedDescriptor.c_str(),
943 &lengthR, &debR, &nbitsR );
946 dbg.Verbose(0, "PixelConvert::BuildLUTRGBA: wrong red LUT descriptor");
949 int lengthG; // Green LUT length in Bytes
950 int debG; // Subscript of the first Lut Value
951 int nbitsG; // Lut item size (in Bits)
952 nbRead = sscanf( LutGreenDescriptor.c_str(),
954 &lengthG, &debG, &nbitsG );
957 dbg.Verbose(0, "PixelConvert::BuildLUTRGBA: wrong green LUT descriptor");
960 int lengthB; // Blue LUT length in Bytes
961 int debB; // Subscript of the first Lut Value
962 int nbitsB; // Lut item size (in Bits)
963 nbRead = sscanf( LutRedDescriptor.c_str(),
965 &lengthB, &debB, &nbitsB );
968 dbg.Verbose(0, "PixelConvert::BuildLUTRGBA: wrong blue LUT descriptor");
971 ////////////////////////////////////////////////////////
972 if ( ( ! LutRedData ) || ( ! LutGreenData ) || ( ! LutBlueData ) )
977 ////////////////////////////////////////////////
978 // forge the 4 * 8 Bits Red/Green/Blue/Alpha LUT
979 LutRGBA = new uint8_t[ 1024 ]; // 256 * 4 (R, G, B, Alpha)
984 memset( LutRGBA, 0, 1024 );
987 if ( ( nbitsR == 16 ) && ( BitsAllocated == 8 ) )
989 // when LUT item size is different than pixel size
990 mult = 2; // high byte must be = low byte
994 // See PS 3.3-2003 C.11.1.1.2 p 619
998 // if we get a black image, let's just remove the '+1'
999 // from 'i*mult+1' and check again
1000 // if it works, we shall have to check the 3 Palettes
1001 // to see which byte is ==0 (first one, or second one)
1003 // We give up the checking to avoid some (useless ?)overhead
1004 // (optimistic asumption)
1006 uint8_t* a = LutRGBA + 0;
1007 for( i=0; i < lengthR; ++i )
1009 *a = LutRedData[i*mult+1];
1014 for( i=0; i < lengthG; ++i)
1016 *a = LutGreenData[i*mult+1];
1021 for(i=0; i < lengthB; ++i)
1023 *a = LutBlueData[i*mult+1];
1028 for(i=0; i < 256; ++i)
1030 *a = 1; // Alpha component
1036 * \brief Build the RGB image from the Decompressed imagage and the LUTs.
1038 bool PixelConvert::BuildRGBImage()
1042 // The job is allready done.
1046 if ( ! Decompressed )
1048 // The job can't be done
1055 // The job can't be done
1061 uint8_t* localRGB = RGB;
1062 for (size_t i = 0; i < DecompressedSize; ++i )
1064 int j = Decompressed[i] * 4;
1065 *localRGB++ = LutRGBA[j];
1066 *localRGB++ = LutRGBA[j+1];
1067 *localRGB++ = LutRGBA[j+2];
1073 * \brief Print self.
1074 * @param indent Indentation string to be prepended during printing.
1075 * @param os Stream to print to.
1077 void PixelConvert::Print( std::string indent, std::ostream &os )
1080 << "--- Pixel information -------------------------"
1083 << "Pixel Data: offset " << PixelOffset
1084 << " x" << std::hex << PixelOffset << std::dec
1085 << " length " << PixelDataLength
1086 << " x" << std::hex << PixelDataLength << std::dec
1089 if ( IsRLELossless )
1093 RLEInfo->Print( indent, os );
1097 dbg.Verbose(0, "PixelConvert::Print: set as RLE file "
1098 "but NO RLEinfo present.");
1102 if ( IsJPEG2000 || IsJPEGLossless )
1106 JPEGInfo->Print( indent, os );
1110 dbg.Verbose(0, "PixelConvert::Print: set as JPEG file "
1111 "but NO JPEGinfo present.");
1116 } // end namespace gdcm
1118 // NOTES on File internal calls
1120 // ---> GetImageData
1121 // ---> GetImageDataIntoVector
1122 // |---> GetImageDataIntoVectorRaw
1123 // | lut intervention
1125 // ---> GetImageDataRaw
1126 // ---> GetImageDataIntoVectorRaw