Compressing bitmap data

The openfl.display.BitmapData.encode() method lets you natively compress bitmap data into one of the following image compression formats:

• PNG - Uses PNG compression, optionally using fast compression, which emphasizes compression speed over file size. To use PNG compression, pass a new openfl.display.PNGEncoderOptions object as the second parameter of the BitmapData.encode() method.
• JPEG - Uses JPEG compression, optionally specifying image quality. To use JPEG compression, pass a new openfl.display.JPEGEncoderOptions object as the second parameter of the BitmapData.encode() method.

You can use this feature for image processing as part of a server upload or download workflow. The following example snippet compresses a BitmapData object using JPEGEncoderOptions:

// Compress a BitmapData object as a JPEG file.
var bitmapData = new BitmapData (640, 480, false, 0x00FF00);
var byteArray = new ByteArray ();
bitmapData.encode (new Rectangle (0, 0, 640, 480), new openfl.display.JPEGEncoderOptions (), byteArray);