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cs440-acg/ext/openexr/OpenEXR/IlmImf/ImfConvert.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.
+//
+///////////////////////////////////////////////////////////////////////////
+
+
+//-----------------------------------------------------------------------------
+//
+//	Routines for converting between pixel data types,
+//	with well-defined behavior for exceptional cases.
+//
+//-----------------------------------------------------------------------------
+
+#include "ImfConvert.h"
+#include "ImfNamespace.h"
+
+#include <limits.h>
+
+
+OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_ENTER
+
+namespace {
+
+inline bool
+isNegative (float f)
+{
+    union {float f; int i;} u;
+    u.f = f;
+    return (u.i & 0x80000000) != 0;
+}
+
+
+inline bool
+isNan (float f)
+{
+    union {float f; int i;} u;
+    u.f = f;
+    return (u.i & 0x7fffffff) > 0x7f800000;
+}
+
+
+inline bool
+isInfinity (float f)
+{
+    union {float f; int i;} u;
+    u.f = f;
+    return (u.i & 0x7fffffff) == 0x7f800000;
+}
+
+
+inline bool
+isFinite (float f)
+{
+    union {float f; int i;} u;
+    u.f = f;
+    return (u.i & 0x7f800000) != 0x7f800000;
+}
+
+} // namespace
+
+
+unsigned int
+halfToUint (half h)
+{
+    if (h.isNegative() || h.isNan())
+	return 0;
+
+    if (h.isInfinity())
+	return UINT_MAX;
+
+    return (unsigned int) h;
+}
+
+
+unsigned int
+floatToUint (float f)
+{
+    if (isNegative (f) || isNan (f))
+	return 0;
+
+    if (isInfinity (f) || f > (float) UINT_MAX)
+	return UINT_MAX;
+
+    return (unsigned int) f;
+}
+
+
+half	
+uintToHalf (unsigned int ui)
+{
+    if (ui >  HALF_MAX)
+	return half::posInf();
+
+    return half ((float) ui);
+}
+
+
+half	
+floatToHalf (float f)
+{
+    if (isFinite (f))
+    {
+	if (f >  HALF_MAX)
+	    return half::posInf();
+
+	if (f < -HALF_MAX)
+	    return half::negInf();
+    }
+
+    return half (f);
+}
+
+
+OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_EXIT