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cs440-acg/ext/openexr/OpenEXR/IlmImf/ImfLut.h

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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.
+//
+///////////////////////////////////////////////////////////////////////////
+
+
+
+#ifndef INCLUDED_IMF_LUT_H
+#define INCLUDED_IMF_LUT_H
+
+//-----------------------------------------------------------------------------
+//
+//	Lookup tables for efficient application
+//	of half --> half functions to pixel data,
+//	and some commonly applied functions.
+//
+//-----------------------------------------------------------------------------
+
+#include "ImfRgbaFile.h"
+#include "ImfFrameBuffer.h"
+#include "ImathBox.h"
+#include "halfFunction.h"
+#include "ImfNamespace.h"
+#include "ImfExport.h"
+
+OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER
+
+//
+// Lookup table for individual half channels.
+//
+
+class IMF_EXPORT HalfLut
+{
+  public:
+
+    //------------
+    // Constructor
+    //------------
+
+    template <class Function>
+    HalfLut (Function f);
+
+
+    //----------------------------------------------------------------------
+    // Apply the table to data[0], data[stride] ... data[(nData-1) * stride]
+    //----------------------------------------------------------------------
+
+    void apply (half *data,
+		int nData,
+		int stride = 1) const;
+
+
+    //---------------------------------------------------------------
+    // Apply the table to a frame buffer slice (see ImfFrameBuffer.h)
+    //---------------------------------------------------------------
+
+    void apply (const Slice &data,
+		const IMATH_NAMESPACE::Box2i &dataWindow) const;
+
+  private:
+
+    halfFunction <half>	_lut;
+};
+
+
+//
+// Lookup table for combined RGBA data.
+//
+
+class IMF_EXPORT RgbaLut
+{
+  public:
+
+    //------------
+    // Constructor
+    //------------
+
+    template <class Function>
+    RgbaLut (Function f, RgbaChannels chn = WRITE_RGB);
+
+
+    //----------------------------------------------------------------------
+    // Apply the table to data[0], data[stride] ... data[(nData-1) * stride]
+    //----------------------------------------------------------------------
+
+    void apply (Rgba *data,
+		int nData,
+		int stride = 1) const;
+
+
+    //-----------------------------------------------------------------------
+    // Apply the table to a frame buffer (see RgbaOutpuFile.setFrameBuffer())
+    //-----------------------------------------------------------------------
+
+    void apply (Rgba *base,
+		int xStride,
+		int yStride,
+		const IMATH_NAMESPACE::Box2i &dataWindow) const;
+
+  private:
+
+    halfFunction <half>	_lut;
+    RgbaChannels	_chn;
+};
+
+
+//
+// 12bit log rounding reduces data to 20 stops with 200 steps per stop.
+// That makes 4000 numbers.  An extra 96 just come along for the ride.
+// Zero explicitly remains zero.  The first non-zero half will map to 1
+// in the 0-4095 12log space.  A nice power of two number is placed at
+// the center [2000] and that number is near 0.18.
+//
+
+IMF_EXPORT 
+half round12log (half x);
+
+
+//
+// Round to n-bit precision (n should be between 0 and 10).
+// After rounding, the significand's 10-n least significant
+// bits will be zero.
+//
+
+struct roundNBit
+{
+    roundNBit (int n): n(n) {}
+    half operator () (half x) {return x.round(n);}
+    int n;
+};
+
+
+//
+// Template definitions
+//
+
+
+template <class Function>
+HalfLut::HalfLut (Function f):
+    _lut(f, -HALF_MAX, HALF_MAX, half (0),
+	 half::posInf(), half::negInf(), half::qNan())
+{
+    // empty
+}
+
+
+template <class Function>
+RgbaLut::RgbaLut (Function f, RgbaChannels chn):
+    _lut(f, -HALF_MAX, HALF_MAX, half (0),
+	 half::posInf(), half::negInf(), half::qNan()),
+    _chn(chn)
+{
+    // empty
+}
+
+
+OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT
+
+#endif