<languageVersion : 1.0;>
  
  kernel Crossfade
  <   namespace : "AIF";
      vendor : "Adobe Systems";
      version : 2;
      description : "Crossfade between two images"; >
  {
     parameter float intensity;
  
     input image4 frontImage;
     input image4 backImage;
     output pixel4 dst;
     
     void evaluatePixel()
     {
          // Acquire the pixel values from both images at the current location
          float4 frontPixel = sampleNearest(frontImage, outCoord());
          float4 backPixel = sampleNearest(backImage, outCoord());
          
          // We set the output to the mix of the two pixels.  The mix function
          // applies the following equation to the pixel values:
          //    (1.0 - intensity) * frontPixel + intensity * backPixel
          dst = mix(frontPixel, backPixel, intensity);
     }
  }