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cs440-acg/ext/openexr/IlmBase/Imath/ImathFun.cpp

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+///////////////////////////////////////////////////////////////////////////
+//
+// Copyright (c) 2002-2012, 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.
+//
+///////////////////////////////////////////////////////////////////////////
+
+
+#include "ImathFun.h"
+
+IMATH_INTERNAL_NAMESPACE_SOURCE_ENTER
+
+
+float
+succf (float f)
+{
+    union {float f; int i;} u;
+    u.f = f;
+
+    if ((u.i & 0x7f800000) == 0x7f800000)
+    {
+        // Nan or infinity; don't change value.
+    }
+    else if (u.i == 0x00000000 || u.i == 0x80000000)
+    {
+        // Plus or minus zero.
+
+        u.i = 0x00000001;
+    }
+    else if (u.i > 0)
+    {
+        // Positive float, normalized or denormalized.
+        // Incrementing the largest positive float
+        // produces +infinity.
+
+        ++u.i;
+    }
+    else
+    {
+        // Negative normalized or denormalized float.
+
+        --u.i;
+    }
+
+    return u.f;
+}
+
+
+float
+predf (float f)
+{
+    union {float f; int i;} u;
+    u.f = f;
+
+    if ((u.i & 0x7f800000) == 0x7f800000)
+    {
+        // Nan or infinity; don't change value.
+    }
+    else if (u.i == 0x00000000 || u.i == 0x80000000)
+    {
+        // Plus or minus zero.
+
+        u.i = 0x80000001;
+    }
+    else if (u.i > 0)
+    {
+        // Positive float, normalized or denormalized.
+
+        --u.i;
+    }
+    else
+    {
+        // Negative normalized or denormalized float.
+        // Decrementing the largest negative float
+        // produces -infinity.
+
+        ++u.i;
+    }
+
+    return u.f;
+}
+
+
+double
+succd (double d)
+{
+    union {double d; Int64 i;} u;
+    u.d = d;
+
+    if ((u.i & 0x7ff0000000000000LL) == 0x7ff0000000000000LL)
+    {
+        // Nan or infinity; don't change value.
+    }
+    else if (u.i == 0x0000000000000000LL || u.i == 0x8000000000000000LL)
+    {
+        // Plus or minus zero.
+
+        u.i = 0x0000000000000001LL;
+    }
+    else if (u.d > 0)
+    {
+        // Positive double, normalized or denormalized.
+        // Incrementing the largest positive double
+        // produces +infinity.
+
+        ++u.i;
+    }
+    else
+    {
+        // Negative normalized or denormalized double.
+
+        --u.i;
+    }
+
+    return u.d;
+}
+
+
+double
+predd (double d)
+{
+    union {double d; Int64 i;} u;
+    u.d = d;
+
+    if ((u.i & 0x7ff0000000000000LL) == 0x7ff0000000000000LL)
+    {
+        // Nan or infinity; don't change value.
+    }
+    else if (u.i == 0x0000000000000000LL || u.i == 0x8000000000000000LL)
+    {
+        // Plus or minus zero.
+
+        u.i = 0x8000000000000001LL;
+    }
+    else if (u.d > 0)
+    {
+        // Positive double, normalized or denormalized.
+
+        --u.i;
+    }
+    else
+    {
+        // Negative normalized or denormalized double.
+        // Decrementing the largest negative double
+        // produces -infinity.
+
+        ++u.i;
+    }
+
+    return u.d;
+}
+
+
+IMATH_INTERNAL_NAMESPACE_SOURCE_EXIT