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cs440-acg/ext/openexr/OpenEXR_Viewers/playexr/ctlToLut.h

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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.
+//
+///////////////////////////////////////////////////////////////////////////
+
+#ifndef INCLUDED_CTL_TO_LUT_H
+#define INCLUDED_CTL_TO_LUT_H
+
+//-----------------------------------------------------------------------------
+//
+//	Run a set of CTL transforms to generate a color lookup table.
+//
+//	Function ctlToLut() applies a series of CTL transforms to a
+//	set of input pixel values, pixelValues, producing a color lookup
+//	table, lut.  A Cg shader in the display thread of the playexr
+//	program will use this lookup table to approximate the effect
+//	of applying the CTL transforms directly to the displayed images.
+//
+//	Parameters:
+//
+//	transformNames	A list of the names of the CTL transforms that will
+//			be applied to the input pixel values.  If this list
+//			is empty, ctlToLut() looks for a rendering transform
+//			and a display transform:
+//
+//			If inHeader contains a string attribute called
+//			"renderingTransform" then the value of this attribute
+//			is the name of the rendering transform.
+//			If inHeader contains no such attribute, then the
+//			name of the rendering transform is "transform_RRT".
+//
+//			If the environment variable CTL_DISPLAY_TRANSFORM
+//			is set, the value of the environment variable is
+//			the name of the display transform.
+//			If the environment variable is not set, then the name
+//			of the display transform is "transform_display_video".
+//
+//	inHeader	The header of the first frame of the image sequence
+//			displayed by playexr.  The attributes in the header
+//			can be read by the CTL transforms.
+//
+//	lutSize		Number of elements in the pixelValues and lut arrays.
+//
+//	pixelValues,
+//	lut		Input and output pixel data arrays.  Four channels
+//			R, G, B and A are interleaved: RGBARGBARGBA...
+//			The A channel is only for padding; it cannot be
+//			accessed by the CTL transforms.
+//
+//
+//	Function displayVideoGamma() returns 1/g, where g is the display's
+//	video gamma.  The value of g is read from the environment variable
+//	EXR_DISPLAY_VIDEO_GAMMA.  If the environment variable is not set,
+//	then displayVideoGamma() returns 1 / 2.2.
+//
+//-----------------------------------------------------------------------------
+
+#include <ImfHeader.h>
+#include <string>
+#include <vector>
+#include <half.h>
+#include <cstdlib>
+
+
+
+
+void
+ctlToLut (std::vector<std::string> transformNames,
+	  OPENEXR_IMF_NAMESPACE::Header inHeader,
+	  size_t lutSize,
+	  const half pixelValues[/*lutSize*/],
+	  half lut[/*lutSize*/]);
+
+float
+displayVideoGamma ();
+
+
+#endif