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The
flash.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
flash.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
flash.display.JPEGEncoderOptions
object
as the second parameter of the
BitmapData.encode()
method.
-
JPEGXR
- Uses JPEG Extended Range (XR) compression,
optionally specifying color channel, lossy, and entropy settings.
To use JPEGXR compression, pass a new
flash.display.JPEGXREncoderOptions
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:BitmapData = new BitmapData(640,480,false,0x00FF00);
var byteArray:ByteArray = new ByteArray();
bitmapData.encode(new Rectangle(0,0,640,480), new flash.display.JPEGEncoderOptions(), byteArray);
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