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

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+///////////////////////////////////////////////////////////////////////////
+//
+// Copyright (c) 2006, 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.
+//
+///////////////////////////////////////////////////////////////////////////
+
+//-----------------------------------------------------------------------------
+//
+//	Rational numbers
+//
+//	The double-to-Rational conversion code below
+//	was contributed to OpenEXR by Greg Ward.
+//
+//-----------------------------------------------------------------------------
+
+#include <ImfRational.h>
+#include <cmath>
+
+using namespace std;
+#include "ImfNamespace.h"
+
+OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_ENTER
+
+namespace {
+
+double
+frac (double x, double e)
+{
+    return x - floor (x + e);
+}
+
+
+double
+square (double x)
+{
+    return x * x;
+}
+
+
+double
+denom (double x, double e)
+{
+    if (e > frac (x, e))
+    {
+        return 1;
+    }
+    else
+    {
+	double r = frac (1 / x, e);
+	
+        if (e > r)
+        {
+            return floor (1 / x + e);
+        }
+        else
+        {
+            return denom (frac (1 / r, e), e / square (x * r)) +
+                   floor (1 / x + e) * denom (frac (1 / x, e), e / square (x));
+        }
+    }
+}
+
+} // namespace
+
+
+Rational::Rational (double x)
+{
+    int sign;
+
+    if (x >= 0)
+    {
+	sign = 1;	// positive
+    }
+    else if (x < 0)
+    {
+	sign = -1;	// negative
+	x = -x;
+    }
+    else
+    {
+	n = 0;		// NaN
+	d = 0;
+	return;
+    }
+
+    if (x >= (1U << 31) - 0.5)
+    {
+	n = sign;	// infinity
+	d = 0;
+	return;
+    }
+
+    double e = (x < 1? 1: x) / (1U << 30);
+    d = (unsigned int) denom (x, e);
+    n = sign * (int) floor (x * d + 0.5);
+}
+
+
+OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_EXIT