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 * Copyright (C) 2008 Adobe Systems Incorporated
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<languageVersion: 1.0;>
 
// invertRGB: A simple example to demonstrate how to invert the RGB color 
//            space.
kernel invertRGB
<   namespace : "AIF";
    vendor : "Adobe Systems, Inc.";
    version : 2;
    description : "Invert the Red, Green and Blue channels of an image"; >
{
    input image4 src;
    output float4 dst;
    
    // evaluatePixel(): The function of the filter that actually does the 
    //                  processing of the image.  This function is called once 
    //                  for each pixel of the output image.
    void
    evaluatePixel()
    {
        // Obtain the input pixel color
        float4 inputColor = sampleNearest(src, outCoord());

        // Calculate (1 - channel) for each of the RGB channels
        dst.rgb = float3(1.0, 1.0, 1.0) - inputColor.rgb;
        
        // set the alpha value equal to the alpha of the input
        dst.a = inputColor.a;
    }
}