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Diffstat (limited to 'Source/OpenEXR/IlmImf/ImfLut.h')
| -rw-r--r-- | Source/OpenEXR/IlmImf/ImfLut.h | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/Source/OpenEXR/IlmImf/ImfLut.h b/Source/OpenEXR/IlmImf/ImfLut.h new file mode 100644 index 0000000..ca702d2 --- /dev/null +++ b/Source/OpenEXR/IlmImf/ImfLut.h @@ -0,0 +1,185 @@ +/////////////////////////////////////////////////////////////////////////// +// +// 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" + +namespace Imf { + +// +// Lookup table for individual half channels. +// + +class 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::Box2i &dataWindow) const; + + private: + + halfFunction <half> _lut; +}; + + +// +// Lookup table for combined RGBA data. +// + +class 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::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. +// + +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 +} + + +} // namespace Imf + +#endif |