将模糊过滤器应用于 BitmapData

问题描述

这是我用来使用 BitmapData 模糊图像的代码.在 Slider_changeHandler(event:Event):void 事件上调用该函数，并将滑块的值作为模糊值传递给该函数.

Here's the code I am using to blur an image using BitmapData. The function is called on a Slider_changeHandler(event:Event):voidevent and the value of the slider is passed to the function as blurvalue.

问题是该函数有效，但似乎是累积性的(如果这是正确的词！)，也就是说，假设我将它滑动到最大，然后尝试通过将其向后滑回模糊的前面来减少模糊还在不断增加.我如何使它工作，以便向上滑动时模糊增加，向后滑动时模糊减少，当滑块为 0 时，不应用模糊.

The problem is the function works but seems to be cummalative (if that's the correct word!), that is, suppose I slide it to the maximum and after that try to reduce the blur by sliding it back towards the front the blur still keeps increasing. How do I make it to work so when I will slide it up blur increases and when I slide it back blur decreases and when slider is at 0, no blur is applied.

            var blur:BlurFilter = new BlurFilter();
            blur.blurX = blurvalue;
            blur.blurY = blurvalue;
            blur.quality = BitmapFilterQuality.MEDIUM;
            bitmapdata.applyFilter(bitmapdata,new
                Rectangle(0,0,bitmapdata.width,bitmapdata.height),new Point(0,0),
                blur);
            return bitmapdata;

推荐答案

如何返回应用了过滤器的原始 bitmapData 的克隆?

how about returning a clone of the original bitmapData with the filter applied ?

例如

var result:BitmapData = bitmapdata.clone();
var blur:BlurFilter = new BlurFilter();
blur.blurX = blurvalue;
blur.blurY = blurvalue;
blur.quality = BitmapFilterQuality.MEDIUM;
result.applyFilter(result,new
Rectangle(0,0,bitmapdata.width,bitmapdata.height),new Point(0,0),blur);
return result;

此外，如果您正在使用 BlurFilter，您可能需要一个更大的矩形，具体取决于模糊量.为此，您可以使用 generateFilterRect() 方法来为过滤器获取正确大小的矩形.

Also, if you're using the BlurFilter, you might need a larger rectangle, depending on the amount of blur. For that, you can use the generateFilterRect() method to get correct sized rectangle for the filter.

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