+ * \brief Recover the pixel area length (in Bytes)
+ * @return Pixel Element Length, as stored in the header
+ * (NOT the memory space necessary to hold the Pixels
+ * -in case of embeded compressed image-)
+ * 0 : NOT USABLE file. The caller has to check.
+ */
+size_t gdcmHeader::GetPixelAreaLength()
+{
+ gdcmDocEntry* pxlElement = GetDocEntryByNumber(GrPixel,NumPixel);
+ if ( pxlElement )
+ {
+ return pxlElement->GetLength();
+ }
+ else
+ {
+#ifdef GDCM_DEBUG
+ std::cout << "Big trouble : Pixel Element ("
+ << std::hex << GrPixel<<","<< NumPixel<< ") NOT found"
+ << std::endl;
+#endif //GDCM_DEBUG
+ return 0;
+ }
+}
+
+/**
+ * \ingroup gdcmHeader
+ * \brief tells us if LUT are used
+ * \warning Right now, 'Segmented xxx Palette Color Lookup Table Data'
+ * are NOT considered as LUT, since nobody knows
+ * how to deal with them
+ * Please warn me if you know sbdy that *does* know ... jprx
+ * @return true if LUT Descriptors and LUT Tables were found
+ */
+bool gdcmHeader::HasLUT()
+{
+ // Check the presence of the LUT Descriptors, and LUT Tables
+ // LutDescriptorRed
+ if ( !GetDocEntryByNumber(0x0028,0x1101) )
+ {
+ return false;
+ }
+ // LutDescriptorGreen
+ if ( !GetDocEntryByNumber(0x0028,0x1102) )
+ {
+ return false;
+ }
+ // LutDescriptorBlue
+ if ( !GetDocEntryByNumber(0x0028,0x1103) )
+ {
+ return false;
+ }
+ // Red Palette Color Lookup Table Data
+ if ( !GetDocEntryByNumber(0x0028,0x1201) )
+ {
+ return false;
+ }
+ // Green Palette Color Lookup Table Data
+ if ( !GetDocEntryByNumber(0x0028,0x1202) )
+ {
+ return false;
+ }
+ // Blue Palette Color Lookup Table Data
+ if ( !GetDocEntryByNumber(0x0028,0x1203) )
+ {
+ return false;
+ }
+
+ // FIXME : (0x0028,0x3006) : LUT Data (CTX dependent)
+ // NOT taken into account, but we don't know how to use it ...
+ return true;
+}
+
+/**
+ * \ingroup gdcmHeader
+ * \brief gets the info from 0028,1101 : Lookup Table Desc-Red
+ * else 0
+ * @return Lookup Table number of Bits , 0 by default
+ * when (0028,0004),Photometric Interpretation = [PALETTE COLOR ]
+ * @ return bit number of each LUT item
+ */
+int gdcmHeader::GetLUTNbits()
+{
+ std::vector<std::string> tokens;
+ int lutNbits;
+
+ //Just hope Lookup Table Desc-Red = Lookup Table Desc-Red = Lookup Table Desc-Blue
+ // Consistency already checked in GetLUTLength
+ std::string lutDescription = GetEntryByNumber(0x0028,0x1101);
+ if ( lutDescription == GDCM_UNFOUND )
+ {
+ return 0;
+ }
+
+ tokens.clear(); // clean any previous value
+ Tokenize ( lutDescription, tokens, "\\" );
+ //LutLength=atoi(tokens[0].c_str());
+ //LutDepth=atoi(tokens[1].c_str());
+
+ lutNbits = atoi( tokens[2].c_str() );
+ tokens.clear();
+
+ return lutNbits;
+}
+
+/**
+ * \ingroup gdcmHeader
+ * \brief builts Red/Green/Blue/Alpha LUT from Header
+ * when (0028,0004),Photometric Interpretation = [PALETTE COLOR ]
+ * and (0028,1101),(0028,1102),(0028,1102)
+ * - xxx Palette Color Lookup Table Descriptor - are found
+ * and (0028,1201),(0028,1202),(0028,1202)
+ * - xxx Palette Color Lookup Table Data - are found
+ * \warning does NOT deal with :
+ * 0028 1100 Gray Lookup Table Descriptor (Retired)
+ * 0028 1221 Segmented Red Palette Color Lookup Table Data
+ * 0028 1222 Segmented Green Palette Color Lookup Table Data
+ * 0028 1223 Segmented Blue Palette Color Lookup Table Data
+ * no known Dicom reader deals with them :-(
+ * @return a RGBA Lookup Table
+ */
+uint8_t* gdcmHeader::GetLUTRGBA()
+{
+ // Not so easy : see
+ // http://www.barre.nom.fr/medical/dicom2/limitations.html#Color%20Lookup%20Tables
+
+// if Photometric Interpretation # PALETTE COLOR, no LUT to be done
+ if ( GetEntryByNumber(0x0028,0x0004) != "PALETTE COLOR " )
+ {
+ return NULL;
+ }
+
+ int lengthR, debR, nbitsR;
+ int lengthG, debG, nbitsG;
+ int lengthB, debB, nbitsB;
+
+ // Get info from Lut Descriptors
+ // (the 3 LUT descriptors may be different)
+ std::string lutDescriptionR = GetEntryByNumber(0x0028,0x1101);
+ if ( lutDescriptionR == GDCM_UNFOUND )
+ {
+ return NULL;
+ }
+
+ std::string lutDescriptionG = GetEntryByNumber(0x0028,0x1102);
+ if ( lutDescriptionG == GDCM_UNFOUND )
+ {
+ return NULL;
+ }
+
+ std::string lutDescriptionB = GetEntryByNumber(0x0028,0x1103);
+ if ( lutDescriptionB == GDCM_UNFOUND )
+ {
+ return NULL;
+ }
+
+ // lengthR: Red LUT length in Bytes
+ // debR: subscript of the first Lut Value
+ // nbitsR: Lut item size (in Bits)
+ int nbRead = sscanf( lutDescriptionR.c_str(), "%d\\%d\\%d",
+ &lengthR, &debR, &nbitsR );
+ if( nbRead != 3 )
+ {
+ dbg.Verbose(0, "gdcmHeader::GetLUTRGBA: trouble reading red LUT");
+ }
+
+ // lengthG: Green LUT length in Bytes
+ // debG: subscript of the first Lut Value
+ // nbitsG: Lut item size (in Bits)
+ nbRead = sscanf( lutDescriptionG.c_str(), "%d\\%d\\%d",
+ &lengthG, &debG, &nbitsG );
+ if( nbRead != 3 )
+ {
+ dbg.Verbose(0, "gdcmHeader::GetLUTRGBA: trouble reading green LUT");
+ }
+
+ // lengthB: Blue LUT length in Bytes
+ // debB: subscript of the first Lut Value
+ // nbitsB: Lut item size (in Bits)
+ nbRead = sscanf( lutDescriptionB.c_str(), "%d\\%d\\%d",
+ &lengthB, &debB, &nbitsB );
+ if( nbRead != 3 )
+ {
+ dbg.Verbose(0, "gdcmHeader::GetLUTRGBA: trouble reading blue LUT");
+ }
+
+ // Load LUTs into memory, (as they were stored on disk)
+ uint8_t* lutR = (uint8_t*) GetEntryVoidAreaByNumber(0x0028,0x1201);
+ uint8_t* lutG = (uint8_t*) GetEntryVoidAreaByNumber(0x0028,0x1202);
+ uint8_t* lutB = (uint8_t*) GetEntryVoidAreaByNumber(0x0028,0x1203);
+
+ if ( !lutR || !lutG || !lutB )
+ {
+ dbg.Verbose(0, "gdcmHeader::GetLUTRGBA: trouble with one of the LUT");
+ return NULL;
+ }
+ // forge the 4 * 8 Bits Red/Green/Blue/Alpha LUT
+
+ uint8_t* LUTRGBA = new uint8_t[1024]; // 256 * 4 (R, G, B, Alpha)
+ if ( !LUTRGBA )
+ {
+ return NULL;
+ }
+ memset(LUTRGBA, 0, 1024);
+
+ // Bits Allocated
+ int nb;
+ std::string str_nb = GetEntryByNumber(0x0028,0x0100);
+ if ( str_nb == GDCM_UNFOUND )
+ {
+ nb = 16;
+ }
+ else
+ {
+ nb = atoi( str_nb.c_str() );
+ }
+ int mult;
+
+ if ( nbitsR == 16 && nb == 8)
+ {
+ // when LUT item size is different than pixel size
+ mult = 2; // high byte must be = low byte
+ }
+ else
+ {
+ // See PS 3.3-2003 C.11.1.1.2 p 619
+ mult = 1;
+ }
+
+ // if we get a black image, let's just remove the '+1'
+ // from 'i*mult+1' and check again
+ // if it works, we shall have to check the 3 Palettes
+ // to see which byte is ==0 (first one, or second one)
+ // and fix the code
+ // We give up the checking to avoid some (useless ?)overhead
+ // (optimistic asumption)
+ uint8_t* a;
+ int i;
+
+ a = LUTRGBA + 0;
+ for( i=0; i < lengthR; ++i)
+ {
+ *a = lutR[i*mult+1];
+ a += 4;
+ }
+
+ a = LUTRGBA + 1;
+ for( i=0; i < lengthG; ++i)
+ {
+ *a = lutG[i*mult+1];
+ a += 4;
+ }
+
+ a = LUTRGBA + 2;
+ for(i=0; i < lengthB; ++i)
+ {
+ *a = lutB[i*mult+1];
+ a += 4;
+ }
+
+ a = LUTRGBA + 3;
+ for(i=0; i < 256; ++i)
+ {
+ *a = 1; // Alpha component
+ a += 4;
+ }
+
+ return LUTRGBA;
+}
+
+/**
+ * \brief Accesses the info from 0002,0010 : Transfert Syntax and gdcmTS
+ * else 1.
+ * @return The full Transfert Syntax Name (as opposed to Transfert Syntax UID)