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High quality, high performance thumbnails

/ Published in: ActionScript 3
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  1. private static const SCALE_DROP:Number = .5;
  2.  
  3. public function resample(bitmapData:BitmapData, newWidth:uint, newHeight:uint):BitmapData
  4. {
  5.     var finalScale:Number = Math.min(newWidth/bitmapData.width, newHeight/bitmapData.height);
  6.     var finalData:BitmapData = bitmapData;
  7.  
  8.     if (finalScale> 1) {
  9.         finalData = new BitmapData(bitmapData.width*finalScale, bitmapData.height*finalScale, true, 0);
  10.         finalData.draw(bitmapData, new Matrix(finalScale, 0, 0, finalScale), null, null, null, true);
  11.         return finalData;
  12.     }
  13.  
  14.     var drop:Number = SCALE_DROP;
  15.     var initialScale:Number = finalScale;
  16.     while (initialScale/drop <1) initialScale /= drop;
  17.  
  18.     var bd:BitmapData = new BitmapData(Math.ceil(bitmapData.width*initialScale), Math.ceil(bitmapData.height*initialScale));
  19.     bd.draw(finalData, new Matrix(initialScale, 0, 0, initialScale), null, null, null, true);
  20.     finalData = bd;
  21.  
  22.     for (var scale:Number = initialScale*drop; Math.round(scale*1000)>= Math.round(finalScale*1000); scale *= drop) {
  23.         bd = new BitmapData(Math.ceil(bitmapData.width*scale), Math.ceil(bitmapData.height*scale));
  24.         bd.draw(finalData, new Matrix(drop, 0, 0, drop), null, null, null, true);
  25.         finalData = bd;
  26.     }
  27.  
  28.     return finalData;
  29. }

URL: http://jacwright.com/blog/221/high-quality-high-performance-thumbnails-in-flash/

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