Disabled external gits

cs440-acg/ext/openexr/OpenEXR/IlmImf/ImfRleCompressor.cpp

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+///////////////////////////////////////////////////////////////////////////
+//
+// Copyright (c) 2002, Industrial Light & Magic, a division of Lucas
+// Digital Ltd. LLC
+// 
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+// *       Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// *       Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// *       Neither the name of Industrial Light & Magic nor the names of
+// its contributors may be used to endorse or promote products derived
+// from this software without specific prior written permission. 
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+///////////////////////////////////////////////////////////////////////////
+
+
+
+//-----------------------------------------------------------------------------
+//
+//	class RleCompressor
+//
+//-----------------------------------------------------------------------------
+
+#include "ImfRleCompressor.h"
+#include "ImfCheckedArithmetic.h"
+#include "ImfRle.h"
+#include "Iex.h"
+#include "ImfNamespace.h"
+
+OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_ENTER
+
+RleCompressor::RleCompressor (const Header &hdr, size_t maxScanLineSize):
+    Compressor (hdr),
+    _maxScanLineSize (maxScanLineSize),
+    _tmpBuffer (0),
+    _outBuffer (0)
+{
+    _tmpBuffer = new char [maxScanLineSize];
+    _outBuffer = new char [uiMult (maxScanLineSize, size_t (3)) / 2];
+}
+
+
+RleCompressor::~RleCompressor ()
+{
+    delete [] _tmpBuffer;
+    delete [] _outBuffer;
+}
+
+
+int
+RleCompressor::numScanLines () const
+{
+    //
+    // This compressor compresses individual scan lines.
+    //
+
+    return 1;
+}
+
+
+int
+RleCompressor::compress (const char *inPtr,
+			 int inSize,
+			 int minY,
+			 const char *&outPtr)
+{
+    //
+    // Special case <20>- empty input buffer
+    //
+
+    if (inSize == 0)
+    {
+	outPtr = _outBuffer;
+	return 0;
+    }
+
+    //
+    // Reorder the pixel data.
+    //
+
+    {
+	char *t1 = _tmpBuffer;
+	char *t2 = _tmpBuffer + (inSize + 1) / 2;
+	const char *stop = inPtr + inSize;
+
+	while (true)
+	{
+	    if (inPtr < stop)
+		*(t1++) = *(inPtr++);
+	    else
+		break;
+
+	    if (inPtr < stop)
+		*(t2++) = *(inPtr++);
+	    else
+		break;
+	}
+    }
+
+    //
+    // Predictor.
+    //
+
+    {
+	unsigned char *t = (unsigned char *) _tmpBuffer + 1;
+	unsigned char *stop = (unsigned char *) _tmpBuffer + inSize;
+	int p = t[-1];
+
+	while (t < stop)
+	{
+	    int d = int (t[0]) - p + (128 + 256);
+	    p = t[0];
+	    t[0] = d;
+	    ++t;
+	}
+    }
+
+    //
+    // Run-length encode the data.
+    //
+
+    outPtr = _outBuffer;
+    return rleCompress (inSize, _tmpBuffer, (signed char *) _outBuffer);
+}
+
+
+int
+RleCompressor::uncompress (const char *inPtr,
+			   int inSize,
+			   int minY,
+			   const char *&outPtr)
+{
+    //
+    // Special case <20>- empty input buffer
+    //
+
+    if (inSize == 0)
+    {
+	outPtr = _outBuffer;
+	return 0;
+    }
+
+    //
+    // Decode the run-length encoded data
+    //
+
+    int outSize;
+
+    if (0 == (outSize = rleUncompress (inSize, _maxScanLineSize,
+				       (const signed char *) inPtr,
+				       _tmpBuffer)))
+    {
+	throw IEX_NAMESPACE::InputExc ("Data decoding (rle) failed.");
+    }
+
+    //
+    // Predictor.
+    //
+
+    {
+	unsigned char *t = (unsigned char *) _tmpBuffer + 1;
+	unsigned char *stop = (unsigned char *) _tmpBuffer + outSize;
+
+	while (t < stop)
+	{
+	    int d = int (t[-1]) + int (t[0]) - 128;
+	    t[0] = d;
+	    ++t;
+	}
+    }
+
+    //
+    // Reorder the pixel data.
+    //
+
+    {
+	const char *t1 = _tmpBuffer;
+	const char *t2 = _tmpBuffer + (outSize + 1) / 2;
+	char *s = _outBuffer;
+	char *stop = s + outSize;
+
+	while (true)
+	{
+	    if (s < stop)
+		*(s++) = *(t1++);
+	    else
+		break;
+
+	    if (s < stop)
+		*(s++) = *(t2++);
+	    else
+		break;
+	}
+    }
+
+    outPtr = _outBuffer;
+    return outSize;
+}
+
+
+OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_EXIT