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cs440-acg/ext/openexr/OpenEXR/exrenvmap/resizeImage.cpp

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