--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Core/DicomFormat/DicomIntegerPixelAccessor.cpp	Thu Sep 20 13:41:55 2012 +0200
@@ -0,0 +1,193 @@
+/**
+ * Orthanc - A Lightweight, RESTful DICOM Store
+ * Copyright (C) 2012 Medical Physics Department, CHU of Liege,
+ * Belgium
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+
+#include "DicomIntegerPixelAccessor.h"
+
+#ifndef NOMINMAX
+#define NOMINMAX
+#endif
+
+#include "../Core/OrthancException.h"
+#include <boost/lexical_cast.hpp>
+#include <limits>
+
+namespace Orthanc
+{
+  static const DicomTag COLUMNS(0x0028, 0x0011);
+  static const DicomTag ROWS(0x0028, 0x0010);
+  static const DicomTag SAMPLES_PER_PIXEL(0x0028, 0x0002);
+  static const DicomTag BITS_ALLOCATED(0x0028, 0x0100);
+  static const DicomTag BITS_STORED(0x0028, 0x0101);
+  static const DicomTag HIGH_BIT(0x0028, 0x0102);
+  static const DicomTag PIXEL_REPRESENTATION(0x0028, 0x0103);
+
+  DicomIntegerPixelAccessor::DicomIntegerPixelAccessor(const DicomMap& values,
+                                                       const void* pixelData,
+                                                       size_t size) :
+    pixelData_(pixelData),
+    size_(size)
+  {
+    unsigned int bitsAllocated;
+    unsigned int bitsStored;
+    unsigned int highBit;
+    unsigned int pixelRepresentation;
+
+    try
+    {
+      width_ = boost::lexical_cast<unsigned int>(values.GetValue(COLUMNS).AsString());
+      height_ = boost::lexical_cast<unsigned int>(values.GetValue(ROWS).AsString());
+      samplesPerPixel_ = boost::lexical_cast<unsigned int>(values.GetValue(SAMPLES_PER_PIXEL).AsString());
+      bitsAllocated = boost::lexical_cast<unsigned int>(values.GetValue(BITS_ALLOCATED).AsString());
+      bitsStored = boost::lexical_cast<unsigned int>(values.GetValue(BITS_STORED).AsString());
+      highBit = boost::lexical_cast<unsigned int>(values.GetValue(HIGH_BIT).AsString());
+      pixelRepresentation = boost::lexical_cast<unsigned int>(values.GetValue(PIXEL_REPRESENTATION).AsString());
+    }
+    catch (boost::bad_lexical_cast)
+    {
+      throw OrthancException(ErrorCode_NotImplemented);
+    }
+
+    frame_ = 0;
+    try
+    {
+      numberOfFrames_ = boost::lexical_cast<unsigned int>(values.GetValue(DicomTag::NUMBER_OF_FRAMES).AsString());
+    }
+    catch (OrthancException)
+    {
+      // If the tag "NumberOfFrames" is absent, assume there is a single frame
+      numberOfFrames_ = 1;
+    }
+    catch (boost::bad_lexical_cast)
+    {
+      throw OrthancException(ErrorCode_NotImplemented);
+    }
+
+    if ((bitsAllocated != 8 && bitsAllocated != 16 && 
+         bitsAllocated != 24 && bitsAllocated != 32) ||
+        numberOfFrames_ == 0)
+    {
+      throw OrthancException(ErrorCode_NotImplemented);
+    }
+
+    if (bitsAllocated > 32 ||
+        bitsStored >= 32)
+    {
+      // Not available, as the accessor internally uses int32_t values
+      throw OrthancException(ErrorCode_NotImplemented);
+    }
+
+    if (samplesPerPixel_ != 1)
+    {
+      throw OrthancException(ErrorCode_NotImplemented);
+    }
+
+    if (width_ * height_ * bitsAllocated / 8 * numberOfFrames_ != size)
+    {
+      throw OrthancException(ErrorCode_NotImplemented);
+    }
+
+    /*printf("%d %d %d %d %d %d %d %d\n", width_, height_, samplesPerPixel_, bitsAllocated,
+           bitsStored, highBit, pixelRepresentation, numberOfFrames_);*/
+
+    bytesPerPixel_ = bitsAllocated / 8;
+    shift_ = highBit + 1 - bitsStored;
+
+    if (pixelRepresentation)
+    {
+      mask_ = (1 << (bitsStored - 1)) - 1;
+      signMask_ = (1 << (bitsStored - 1));
+    }
+    else
+    {
+      mask_ = (1 << bitsStored) - 1;
+      signMask_ = 0;
+    }
+
+    rowOffset_ = width_ * bytesPerPixel_;
+    frameOffset_ = height_ * width_ * bytesPerPixel_;
+  }
+
+
+  void DicomIntegerPixelAccessor::GetExtremeValues(int32_t& min, 
+                                                   int32_t& max) const
+  {
+    if (height_ == 0 || width_ == 0)
+    {
+      min = max = 0;
+      return;
+    }
+
+    min = std::numeric_limits<int32_t>::max();
+    max = std::numeric_limits<int32_t>::min();
+    
+    for (unsigned int y = 0; y < height_; y++)
+    {
+      for (unsigned int x = 0; x < width_; x++)
+      {
+        int32_t v = GetValue(x, y);
+        if (v < min)
+          min = v;
+        if (v > max)
+          max = v;
+      }
+    }
+  }
+
+
+  int32_t DicomIntegerPixelAccessor::GetValue(unsigned int x, unsigned int y) const
+  {
+    assert(x < width_ && y < height_);
+    
+    const uint8_t* pixel = reinterpret_cast<const uint8_t*>(pixelData_) + 
+      y * rowOffset_ + x * bytesPerPixel_ + frame_ * frameOffset_;
+
+    int32_t v;
+    v = pixel[0];
+    if (bytesPerPixel_ >= 2)
+      v = v + (static_cast<int32_t>(pixel[1]) << 8);
+    if (bytesPerPixel_ >= 3)
+      v = v + (static_cast<int32_t>(pixel[2]) << 16);
+    if (bytesPerPixel_ >= 4)
+      v = v + (static_cast<int32_t>(pixel[3]) << 24);
+
+    v = (v >> shift_) & mask_;
+
+    if (v & signMask_)
+    {
+      // Signed value: Not implemented yet
+      //throw OrthancException(ErrorCode_NotImplemented);
+      v = 0;
+    }
+
+    return v;
+  }
+
+
+  void DicomIntegerPixelAccessor::SetCurrentFrame(unsigned int frame)
+  {
+    if (frame >= numberOfFrames_)
+    {
+      throw OrthancException(ErrorCode_ParameterOutOfRange);
+    }
+
+    frame_ = frame;
+  }
+
+}