Program: gdcm
Module: $RCSfile: gdcmPixelConvert.cxx,v $
Language: C++
- Date: $Date: 2004/10/13 04:05:04 $
- Version: $Revision: 1.10 $
+ Date: $Date: 2004/10/13 14:15:30 $
+ Version: $Revision: 1.11 $
Copyright (c) CREATIS (Centre de Recherche et d'Applications en Traitement de
l'Image). All rights reserved. See Doc/License.txt or
* \brief Read from file a 12 bits per pixel image and uncompress it
* into a 16 bits per pixel image.
*/
-void PixelConvert::Decompress12BitsTo16Bits(
+void PixelConvert::ReadAndDecompress12BitsTo16Bits(
uint8_t* pixelZone,
FILE* filePtr)
throw ( FormatError )
ItemRead = fread( &b0, 1, 1, filePtr);
if ( ItemRead != 1 )
{
- throw FormatError( "File::Decompress12BitsTo16Bits()",
+ throw FormatError( "File::ReadAndDecompress12BitsTo16Bits()",
"Unfound first block" );
}
ItemRead = fread( &b1, 1, 1, filePtr);
if ( ItemRead != 1 )
{
- throw FormatError( "File::Decompress12BitsTo16Bits()",
+ throw FormatError( "File::ReadAndDecompress12BitsTo16Bits()",
"Unfound second block" );
}
ItemRead = fread( &b2, 1, 1, filePtr);
if ( ItemRead != 1 )
{
- throw FormatError( "File::Decompress12BitsTo16Bits()",
+ throw FormatError( "File::ReadAndDecompress12BitsTo16Bits()",
"Unfound second block" );
}
/**
* \brief Re-arrange the bits within the bytes.
- * @param fp already open File Pointer
- * @param destination Where decompressed fragments should end up
+ * @param pixelZone zone
* @return Boolean
*/
bool PixelConvert::ReArrangeBits( uint8_t* pixelZone )
* \brief Convert (Y plane, cB plane, cR plane) to RGB pixels
* \warning Works on all the frames at a time
*/
-void PixelConvert::ConvertYcBcRPlanesToRGBPixels(
- uint8_t* destination,
- size_t imageDataSize )
+void PixelConvert::ConvertYcBcRPlanesToRGBPixels( uint8_t* destination )
{
- uint8_t* oldPixelZone = new uint8_t[ imageDataSize ];
- memmove( oldPixelZone, destination, imageDataSize );
+ uint8_t* oldPixelZone = new uint8_t[ DecompressedSize ];
+ memmove( oldPixelZone, destination, DecompressedSize );
// to see the tricks about YBR_FULL, YBR_FULL_422,
// YBR_PARTIAL_422, YBR_ICT, YBR_RCT have a look at :
* \brief Convert (Red plane, Green plane, Blue plane) to RGB pixels
* \warning Works on all the frames at a time
*/
-void PixelConvert::ConvertRGBPlanesToRGBPixels(
- uint8_t* destination,
- size_t imageDataSize )
+void PixelConvert::ConvertRGBPlanesToRGBPixels( uint8_t* destination )
{
- uint8_t* oldPixelZone = new uint8_t[ imageDataSize ];
- memmove( oldPixelZone, destination, imageDataSize );
+ uint8_t* oldPixelZone = new uint8_t[ DecompressedSize ];
+ memmove( oldPixelZone, destination, DecompressedSize );
int l = XSize * YSize * ZSize;
bool PixelConvert::ReadAndDecompressPixelData( void* destination, FILE* fp )
{
+ //////////////////////////////////////////////////
+ //// First stage: get our hands on the Pixel Data.
if ( !fp )
{
+ dbg.Verbose( 0, "PixelConvert::ReadAndDecompressPixelData: "
+ "unavailable file pointer." );
return false;
}
if ( fseek(fp, PixelOffset, SEEK_SET) == -1 )
{
+ dbg.Verbose( 0, "PixelConvert::ReadAndDecompressPixelData: "
+ "unable to find PixelOffset in file." );
return false;
}
+ //////////////////////////////////////////////////
+ //// Second stage: read from disk dans uncompress.
if ( BitsAllocated == 12 )
{
- Decompress12BitsTo16Bits( (uint8_t*)destination, fp);
- return true;
+ ReadAndDecompress12BitsTo16Bits( (uint8_t*)destination, fp);
}
-
- //////////// Decompressed File
- if ( IsUncompressed )
+ else if ( IsUncompressed )
{
size_t ItemRead = fread( destination, PixelDataLength, 1, fp);
if ( ItemRead != 1 )
{
+ dbg.Verbose( 0, "PixelConvert::ReadAndDecompressPixelData: "
+ "reading of uncompressed pixel data failed." );
return false;
}
- else
+ }
+ else if ( IsRLELossless )
+ {
+ if ( ! ReadAndDecompressRLEFile( destination, fp ) )
{
- return true;
+ dbg.Verbose( 0, "PixelConvert::ReadAndDecompressPixelData: "
+ "RLE decompressor failed." );
+ return false;
}
}
+ else
+ {
+ // Default case concerns JPEG family
+ if ( ! ReadAndDecompressJPEGFile( (uint8_t*)destination, fp ) )
+ {
+ dbg.Verbose( 0, "PixelConvert::ReadAndDecompressPixelData: "
+ "JPEG decompressor failed." );
+ return false;
+ }
+ }
+
+ ////////////////////////////////////////////
+ //// Third stage: twigle the bytes and bits.
+ ReorderEndianity( (uint8_t*) destination );
+ ReArrangeBits( (uint8_t*) destination );
+
+}
+
+bool PixelConvert::HandleColor( uint8_t* destination )
+{
+ //////////////////////////////////
+ // Deal with the color decoding i.e. handle:
+ // - R, G, B planes (as opposed to RGB pixels)
+ // - YBR (various) encodings.
+ // - LUT[s] (or "PALETTE COLOR").
+ //
+ // The classification in the color decoding schema is based on the blending
+ // of two Dicom tags values:
+ // * "Photometric Interpretation" for which we have the cases:
+ // - [Photo A] MONOCHROME[1|2] pictures,
+ // - [Photo B] RGB or YBR_FULL_422 (which acts as RGB),
+ // - [Photo C] YBR_* (with the above exception of YBR_FULL_422)
+ // - [Photo D] "PALETTE COLOR" which indicates the presence of LUT[s].
+ // * "Planar Configuration" for which we have the cases:
+ // - [Planar 0] 0 then Pixels are already RGB
+ // - [Planar 1] 1 then we have 3 planes : R, G, B,
+ // - [Planar 2] 2 then we have 1 gray Plane and 3 LUTs
+ //
+ // Now in theory, one could expect some coherence when blending the above
+ // cases. For example we should not encounter files belonging at the
+ // time to case [Planar 0] and case [Photo D].
+ // Alas, this was only theory ! Because in practice some odd (read ill
+ // formated Dicom) files (e.g. gdcmData/US-PAL-8-10x-echo.dcm) we encounter:
+ // - "Planar Configuration" = 0,
+ // - "Photometric Interpretation" = "PALETTE COLOR".
+ // Hence gdcm shall use the folowing "heuristic" in order to be tolerant
+ // towards Dicom-non-conformance files:
+ // << whatever the "Planar Configuration" value might be, a
+ // "Photometric Interpretation" set to "PALETTE COLOR" forces
+ // a LUT intervention >>
+ //
+ // Now we are left with the following handling of the cases:
+ // - [Planar 0] OR [Photo A] no color decoding (since respectively
+ // Pixels are already RGB and monochrome pictures have no color :),
+ // - [Planar 1] AND [Photo B] handled with ConvertRGBPlanesToRGBPixels()
+ // - [Planar 1] AND [Photo C] handled with ConvertYcBcRPlanesToRGBPixels()
+ // - [Planar 2] OR [Photo D] requires LUT intervention.
+
+ if ( IsMonochrome
+ || ( PlanarConfiguration == 2 )
+ || IsPaletteColor )
+ {
+ // [Planar 2] OR [Photo D]: LUT intervention done outside
+ return false;
+ }
- ///////////// Run Length Encoding
- if ( IsRLELossless )
+ if ( PlanarConfiguration == 1 )
{
- return ReadAndDecompressRLEFile( destination, fp );
+ if ( IsYBRFull )
+ {
+ // [Planar 1] AND [Photo C] (remember YBR_FULL_422 acts as RGB)
+ ConvertYcBcRPlanesToRGBPixels( (uint8_t*)destination );
+ }
+ else
+ {
+ // [Planar 1] AND [Photo C]
+ ConvertRGBPlanesToRGBPixels( (uint8_t*)destination );
+ }
}
- ///////////// SingleFrame/Multiframe JPEG Lossless/Lossy/2000
- return ReadAndDecompressJPEGFile( (uint8_t*)destination, fp );
+ // When planarConf is 0, pixels are allready in RGB
+ return true;
}
void PixelConvert::ComputeDecompressedImageDataSize()
int bitsAllocated;
// Number of "Bits Allocated" is fixed to 16 when it's 12, since
// in this case we will expand the image to 16 bits (see
- // \ref Decompress12BitsTo16Bits() )
+ // \ref ReadAndDecompress12BitsTo16Bits() )
if ( BitsAllocated == 12 )
{
bitsAllocated = 16;
}
} // end namespace gdcm
+
+// NOTES on File internal calls
+// User
+// ---> GetImageData
+// ---> GetImageDataIntoVector
+// |---> GetImageDataIntoVectorRaw
+// | lut intervention
+// User
+// ---> GetImageDataRaw
+// ---> GetImageDataIntoVectorRaw
git://git.creatis.insa-lyon.fr / gdcm.git / blobdiff