Actionscript HSL Color blend texture

HSLColorBlender.as

        public static function hslColorBlendMaterial(target:BitmapData,colorMask:BitmapData,color:uint,darkLuminance:Number=0.0):void
        {
            Profiler.enter("BitmapFeatureRenderer.colorBlendMaterial");
            var hslColorMask:HSL = new HSL();            
            var hslTarget:HSL = new HSL();
            if(colorMask != null && !colorMask.rect.equals(target.rect))
                throw new Error("only supports color blending same size textures");
            
            // Calculate a single HSL color for the mask.
            HSL.convertRGBToHSL(color,hslColorMask);
            var isDark:Boolean = (hslColorMask.luminance < darkLuminance);
            
            for(var x:int = 0; x < target.width; x++)
            {
                for (var y:int = 0; y < target.height; y++)
                {
                    var maskPixel:uint = (colorMask != null) ? colorMask.getPixel(x,y) : 0xFFFFFF;
                    if(maskPixel != 0)
                    {
                        HSL.convertRGBToHSL(target.getPixel(x,y),hslTarget);                       
                        hslTarget.hue = hslColorMask.hue;
                        hslTarget.saturation = hslColorMask.saturation;
                        
                        hslTarget.luminance = Math.pow(hslTarget.luminance,2.1);
                        target.setPixel(x,y,HSL.convertHSLToRGB(hslTarget));
                    }
                }
            }
            
            Profiler.exit("BitmapFeatureRenderer.colorBlendMaterial");
        }