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BitmapData Set Each Pixel To Random Color

/ Published in: ActionScript 3
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Using lock() and unLock() saves about 20% when doing bulk pixel updates.

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  1. // Create the bitmap
  2. var imgData:BitmapData = new BitmapData(500, 500, true, 0x00000000);
  3. var bmp:Bitmap = new Bitmap(imgData);
  4. // Invoke lock( )
  5. imgData.lock( );
  6. // Set pixel color-values
  7. var color:uint;
  8. for (var i:int = 0; i < imgData.height ; i++) {
  9.     for (var j:int = 0; j < imgData.width; j++) {
  10.         color = Math.floor(Math.random( )*0xFFFFFFFF);
  11.         imgData.setPixel32(j, i, color);
  12.     }
  13. }
  14. // Invoke unlock( )
  15. imgData.lock( );

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