179 lines
4.5 KiB
C++
179 lines
4.5 KiB
C++
///////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 2002, Industrial Light & Magic, a division of Lucas
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// Digital Ltd. LLC
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Industrial Light & Magic nor the names of
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// its contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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///////////////////////////////////////////////////////////////////////////
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//-----------------------------------------------------------------------------
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//
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// Lookup tables for efficient application
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// of half --> half functions to pixel data,
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// and some commonly applied functions.
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//
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//-----------------------------------------------------------------------------
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#include <ImfLut.h>
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#include <math.h>
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#include <assert.h>
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#include "ImfNamespace.h"
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OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_ENTER
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void
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HalfLut::apply (half *data, int nData, int stride) const
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{
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while (nData)
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{
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*data = _lut (*data);
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data += stride;
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nData -= 1;
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}
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}
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void
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HalfLut::apply (const Slice &data, const IMATH_NAMESPACE::Box2i &dataWindow) const
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{
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assert (data.type == HALF);
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assert (dataWindow.min.x % data.xSampling == 0);
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assert (dataWindow.min.y % data.ySampling == 0);
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assert ((dataWindow.max.x - dataWindow.min.x + 1) % data.xSampling == 0);
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assert ((dataWindow.max.y - dataWindow.min.y + 1) % data.ySampling == 0);
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char *base = data.base + data.yStride *
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(dataWindow.min.y / data.ySampling);
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for (int y = dataWindow.min.y;
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y <= dataWindow.max.y;
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y += data.ySampling)
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{
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char *pixel = base + data.xStride *
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(dataWindow.min.x / data.xSampling);
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for (int x = dataWindow.min.x;
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x <= dataWindow.max.x;
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x += data.xSampling)
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{
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*(half *)pixel = _lut (*(half *)pixel);
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pixel += data.xStride;
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}
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base += data.yStride;
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}
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}
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void
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RgbaLut::apply (Rgba *data, int nData, int stride) const
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{
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while (nData)
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{
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if (_chn & WRITE_R)
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data->r = _lut (data->r);
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if (_chn & WRITE_G)
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data->g = _lut (data->g);
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if (_chn & WRITE_B)
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data->b = _lut (data->b);
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if (_chn & WRITE_A)
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data->a = _lut (data->a);
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data += stride;
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nData -= 1;
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}
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}
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void
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RgbaLut::apply (Rgba *base,
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int xStride, int yStride,
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const IMATH_NAMESPACE::Box2i &dataWindow) const
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{
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base += dataWindow.min.y * yStride;
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for (int y = dataWindow.min.y; y <= dataWindow.max.y; ++y)
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{
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Rgba *pixel = base + dataWindow.min.x * xStride;
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for (int x = dataWindow.min.x; x <= dataWindow.max.x; ++x)
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{
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if (_chn & WRITE_R)
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pixel->r = _lut (pixel->r);
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if (_chn & WRITE_G)
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pixel->g = _lut (pixel->g);
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if (_chn & WRITE_B)
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pixel->b = _lut (pixel->b);
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if (_chn & WRITE_A)
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pixel->a = _lut (pixel->a);
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pixel += xStride;
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}
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base += yStride;
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}
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}
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half
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round12log (half x)
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{
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const float middleval = pow (2.0, -2.5);
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int int12log;
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if (x <= 0)
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{
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return 0;
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}
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else
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{
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int12log = int (2000.5 + 200.0 * log (x / middleval) / log (2.0));
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if (int12log > 4095)
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int12log = 4095;
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if (int12log < 1)
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int12log = 1;
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}
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return middleval * pow (2.0, (int12log - 2000.0) / 200.0);
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}
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OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_EXIT
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