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///////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 2007, 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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// resizeLatLong(), resizeCube() -- functions that resample
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// an environment map and convert it to latitude-longitude or
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// cube-face format.
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//
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//-----------------------------------------------------------------------------
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#include <resizeImage.h>
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#include "Iex.h"
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#include <string.h>
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#include "namespaceAlias.h"
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using namespace IMF;
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using namespace std;
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using namespace IMATH;
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void
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resizeLatLong (const EnvmapImage &image1,
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EnvmapImage &image2,
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const Box2i &image2DataWindow,
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float filterRadius,
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int numSamples)
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{
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int w = image2DataWindow.max.x - image2DataWindow.min.x + 1;
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int h = image2DataWindow.max.y - image2DataWindow.min.y + 1;
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float radius = 0.5f * 2 * M_PI * filterRadius / w;
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image2.resize (ENVMAP_LATLONG, image2DataWindow);
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image2.clear ();
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Array2D<Rgba> &pixels = image2.pixels();
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for (int y = 0; y < h; ++y)
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{
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for (int x = 0; x < w; ++x)
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{
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V3f dir = LatLongMap::direction (image2DataWindow, V2f (x, y));
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pixels[y][x] = image1.filteredLookup (dir, radius, numSamples);
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}
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}
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}
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void
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resizeCube (const EnvmapImage &image1,
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EnvmapImage &image2,
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const Box2i &image2DataWindow,
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float filterRadius,
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int numSamples)
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{
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if (image1.type() == ENVMAP_CUBE && image1.dataWindow() == image2DataWindow)
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{
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//
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// Special case - the input image is a cube-face environment
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// map with the same size as the output image. We can copy
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// the input image without resampling.
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//
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image2.resize (ENVMAP_CUBE, image2DataWindow);
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int w = image2DataWindow.max.x - image2DataWindow.min.x + 1;
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int h = image2DataWindow.max.y - image2DataWindow.min.y + 1;
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memcpy (&(image2.pixels()[0][0]),
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&(image1.pixels()[0][0]),
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sizeof (Rgba) * w * h);
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return;
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}
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//
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// Resampe the input image
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//
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int sof = CubeMap::sizeOfFace (image2DataWindow);
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float radius = 1.5f * filterRadius / sof;
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image2.resize (ENVMAP_CUBE, image2DataWindow);
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image2.clear ();
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Array2D<Rgba> &pixels = image2.pixels();
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for (int f = CUBEFACE_POS_X; f <= CUBEFACE_NEG_Z; ++f)
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{
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CubeMapFace face = CubeMapFace (f);
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for (int y = 0; y < sof; ++y)
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{
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for (int x = 0; x < sof; ++x)
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{
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V2f posInFace (x, y);
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V3f dir =
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CubeMap::direction (face, image2DataWindow, posInFace);
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V2f pos =
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CubeMap::pixelPosition (face, image2DataWindow, posInFace);
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pixels[int (pos.y + 0.5f)][int (pos.x + 0.5f)] =
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image1.filteredLookup (dir, radius, numSamples);
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}
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}
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}
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}
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