BitmapData munches my CPU!

programming
1

Hey there… im currently working on a space game and i wanna chuck in some nice ‘spacey’ effects so ive had a very strange attempt at bitmap data. Now im not gonna lie, i have never used it in my life so that explains why i am here…

Basicly i want a nice blury trail to follow EVERYTHING, yes everything in my game… it looks great BUT the CPU usage rises to about 50%! Now my PC is pretty beefy!!! so what kind off effect will someone with a PC that isnt so good get :-/!

Also using an FPS counter ive noted a slight drop, only when capped 40+

TBH ive got to be doing somthing wrong because bitmapData is godlike from what i have heard, someone please enlighten me!

My code is here and the link to the SWF is http://img170.imageshack.us/my.php?image=vectorwarszh4.swf, even if you dont know that answer gimmi an idea what FPS you got :sure:

import flash.display.BitmapData;
import flash.filters.BlurFilter;

class bitmap
{
    //variables
    public var sourceMC:MovieClip;
    public var destMC:MovieClip;
    public var bmpData:BitmapData;

    //FUNCTION: constructer
    public function bitmap(a:MovieClip)
    {
        sourceMC = a.createEmptyMovieClip("sourceMC", a.getNextHighestDepth());
        destMC = a.createEmptyMovieClip("destMC", a.getNextHighestDepth());
        bmpData = new BitmapData(Stage.width, Stage.height, true, 0);
        destMC._alpha = 40;
    }
    //FUNCTION: draw new data
    public function draw():Void
    {
        bmpData.draw(sourceMC);
    }
    //FUNCTION: display new data & apply filter
    public function display():Void
    {
        destMC.attachBitmap(bmpData,0);
        bmpData.applyFilter(bmpData,bmpData.rectangle,destMC.Point(0, 0),new BlurFilter(5.5, 5.5, 3));
    }
}

This is called from the FLA with an onEnterFrame event!! (PS: HOLD SPACE TO DISABLE THE BITMAPPING)

TY in advance :slight_smile: