Quick tip: Fastest ActionScript PNGEncoder (update)

Here are some benchmark tests for current available PNGEncoders. Sync encoding tested on 2 real bitmap images (500x300px, 256x256px) on Intel Core 2 Duo @ 2.80GHz, win XP:

encoder / image                         500x333 px  256x256 px
by.blooddy.crypto.image.PNG24Encoder     78ms       125ms
dsk.PNGEncoder							140ms		141ms
net.kaourantin.PNGEnc					188ms		187ms
mx.graphics.codec.PNGEncoder			203ms		172ms
com.adobe.images.PNGEncoder				219ms		172ms
org.aswing.image.png.AsPngEncoder		234ms		172ms
ru.inspirit.encoders.png.PNGEncoder		391ms		203ms

by.blooddy.crypto.image.PNG24Encoder worked fastest for me.

Update Nov 15, 2011: There is a new worth to try async and superfast encoder from Cameron written in HaXe called PNGEncoder2.

Check out some more benchmarks from Blooddy and Cameron.

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A different view on loops – listener-looping

What is the usual practice when searching / setting / operating over some list of item? I think you usually think of iterating over some list (array) or linked list etc. Well, ActionScript has to offer one more technique you maybe never tought of, lets call it listener-looping. ActionScript is event based language, that means that every EventDispatcher based classes are able to listen and dispatch events. And this fits our needs for loop alternative. Lets suggest, you do not have any list to be iterated over but you still have a chance to accomplish it by making each item listening for custom event.

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Myth Buster – Benchmarking Loops

Lets have a look at some of the most common and fastest loops used in ActionScript 3. Is int really faster than uint and Number? Is while loop faster than for? Is pre-increment faster than post-increment? To test all of these I have created benchmark test application on wonderfl. App compares loops with 10.000.000 iterations and logs testing times. To compare different variable types, loop methods, increment / decrement modes, there are buttons grouping each test. Please be patient with your first click, the model Array is being generated (Link button also generates linked list). The first test compares Arrays, second one Vectors.

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How to resize an image with ActionScript (update)


If you need to resize an image on client side, I mean real bitmapData resize (not just showing scaled), feel free to use ImageResizer class. This class takes bitmapData of source image, new width and height and resize method (defined by ResizeMath class), and returns new bitmapData of resized image.

Update: It seems that bitmapData.draw() method uses bilinear algorithm when scaling via Matrix. Bilinear algorithm gives you fine results when downscaling no more than 2 times (400px -> 200px). So, I added bilinearIterative() method into ImageResizer class that creates resized bitmapData by multiple steps achieving much smoother results!

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ActionScript 3 Performance Testing

Have you ever been curious about performance (benchmark) tests in ActionScript 3? Here are some results gathered from gskinner blog.

Performance testing on loops (read more).

method............................................................. ms
for (var i:uint=0; i<length; i++)                                   40
for (var i:uint=length; i>0; i--)                                   40
var i:uint = 0; while (i < length) i++;                             40
var i:uint = length; while (--i)                                    52
var i:uint = 0; do {} while (++i < length);                         68
var i:uint = length-1; do {} while (i--);                           68
for (var b:* in arr)                                               224
for each (var b:Boolean in arr)                                    216
for each (var b:* in arr)                                          200
for each (var b:* in arr) var c:Boolean = b as Boolean;            686
arr.forEach(arrForEachF)                                          1446

Performance testing on operations with Number, int, uint. (read more)

Assignment (a:TYPE = 0) ......... min - max (ms)
int:                               24 -  45
Number:                            24 -  36
uint:                              25 -  37
Assignment (a:TYPE = 0.5) ....... min - max (ms)
int:                               56 -  83
Number:                            26 -  43
uint:                              57 -  92
Division (a:TYPE = i/2) ......... min - max (ms)
int:                               60 - 105
Number:                            34 -  64
uint:                             184 - 278
Multiplication (a:TYPE = i*2) ... min - max (ms)
int:                               78 - 129
Number:                            39 -  64
uint:                             207 - 280
Addition (a:TYPE = i+2) ......... min - max (ms)
int:                               31 -  49
Number:                            44 -  55
uint:                              85 - 113
Bitshift (a:TYPE = i<<1) ........ min - max (ms)
int:                               31 -  63
Number:                            61 - 114
uint:                              71 - 130