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AMF.NET comes with a BitmapReconstitutor meant both as an example of how to build your own Reconstitutors and to let you pass images to your functions. The BitmapReconstitutor was used to map a custom ActionScript class to a .NET Bitmap object. Below is the custom ActionScript class which the BitMapReconstitutor will be able to handle:

class com.image.SerializedBitmap
{
   private var __pixels:String;
   private var __height:Number;
   private var __width:Number;
   private var __transparent:Boolean;

   public function get pixels():String
   {
       return ( __pixels );
   }
   public function get height():Number
   {
       return ( __height );
   }
   public function get width():Number
   {
       return ( __width );
   }

    public function SerializedBitmap( pixels:String, width:Number, height:Number, transparent:Boolean )
    {
        __pixels = pixels;
        __height = height;
        __width = width;
        __transparent = transparent;
    }    
}

The class was registered in Flash with:

Object.registerClass( "SerializedBitmap", com.spirograph.image.SerializedBitmap );

Unfortunetly, how you turn a BitmapData into a SerializedBitmap is up to you.