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cs440-acg/ext/openexr/OpenEXR/IlmImf/ImfDeepCompositing.cpp

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+///////////////////////////////////////////////////////////////////////////
+//
+// Copyright (c) 2012, Weta Digital Ltd
+// 
+// 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 Weta Digital 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.
+//
+///////////////////////////////////////////////////////////////////////////
+
+#include "ImfDeepCompositing.h"
+
+#include "ImfNamespace.h"
+#include <algorithm>
+#include <vector>
+
+OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_ENTER
+
+using std::sort;
+using std::vector;
+DeepCompositing::DeepCompositing()
+{
+}
+
+DeepCompositing::~DeepCompositing()
+{
+}
+
+void 
+DeepCompositing::composite_pixel (float outputs[],
+                                  const float* inputs[],
+                                  const char*channel_names[],
+                                  int num_channels,
+                                  int num_samples,
+                                  int sources)
+{
+    for(int i=0;i<num_channels;i++) outputs[i]=0.0;
+    // no samples? do nothing
+   if(num_samples==0)
+   {
+       return;
+   }
+   
+   vector<int> sort_order;
+   if(sources>1)
+   {
+       sort_order.resize(num_samples);
+       for(int i=0;i<num_samples;i++) sort_order[i]=i;
+       sort(&sort_order[0],inputs,channel_names,num_channels,num_samples,sources);
+   }
+   
+   
+   for(int i=0;i<num_samples;i++)
+   {
+       int s=(sources>1) ? sort_order[i] : i;
+       float alpha=outputs[2]; 
+       if(alpha>=1.0) return;
+       
+       for(int c=0;c<num_channels;c++)
+       {
+           outputs[c]+=(1.0-alpha)*inputs[c][s];
+       }
+   }   
+}
+
+struct sort_helper
+{
+    const float ** inputs;
+    bool operator() (int a,int b) 
+    {
+        if(inputs[0][a] < inputs[0][b]) return true;
+        if(inputs[0][a] > inputs[0][b]) return false;
+        if(inputs[1][a] < inputs[1][b]) return true;
+        if(inputs[1][a] > inputs[1][b]) return false;
+        return a<b;
+    }
+    sort_helper(const float ** i) : inputs(i) {}
+};
+
+void
+DeepCompositing::sort(int order[], const float* inputs[], const char* channel_names[], int num_channels, int num_samples, int sources)
+{
+  std::sort(order+0,order+num_samples,sort_helper(inputs));
+}
+
+
+OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_EXIT