BlurTransformation crashs on Android 4.4

[baole]

Bug Reporting

Using glide-transformations 4.0.1

11-28 10:47:25.243 5546-5693/net.tandem E/GlideExecutor: Request threw uncaught throwable
    java.lang.ArrayIndexOutOfBoundsException: length=112896; index=116326
        at jp.wasabeef.glide.transformations.internal.FastBlur.blur(FastBlur.java:208)
        at jp.wasabeef.glide.transformations.BlurTransformation.transform(BlurTransformation.java:73)
        at jp.wasabeef.glide.transformations.BitmapTransformation.transform(BitmapTransformation.java:50)
        at com.bumptech.glide.load.engine.DecodeJob.onResourceDecoded(DecodeJob.java:540)
        at com.bumptech.glide.load.engine.DecodeJob$DecodeCallback.onResourceDecoded(DecodeJob.java:604)
        at com.bumptech.glide.load.engine.DecodePath.decode(DecodePath.java:46)
        at com.bumptech.glide.load.engine.LoadPath.loadWithExceptionList(LoadPath.java:58)
        at com.bumptech.glide.load.engine.LoadPath.load(LoadPath.java:43)
        at com.bumptech.glide.load.engine.DecodeJob.runLoadPath(DecodeJob.java:507)
        at com.bumptech.glide.load.engine.DecodeJob.decodeFromFetcher(DecodeJob.java:472)
        at com.bumptech.glide.load.engine.DecodeJob.decodeFromData(DecodeJob.java:458)
        at com.bumptech.glide.load.engine.DecodeJob.decodeFromRetrievedData(DecodeJob.java:410)
        at com.bumptech.glide.load.engine.DecodeJob.onDataFetcherReady(DecodeJob.java:379)
        at com.bumptech.glide.load.engine.SourceGenerator.onDataReady(SourceGenerator.java:112)
        at com.bumptech.glide.load.model.UnitModelLoader$UnitFetcher.loadData(UnitModelLoader.java:57)
        at com.bumptech.glide.load.engine.SourceGenerator.startNext(SourceGenerator.java:62)
        at com.bumptech.glide.load.engine.DecodeJob.runGenerators(DecodeJob.java:302)
        at com.bumptech.glide.load.engine.DecodeJob.runWrapped(DecodeJob.java:269)
        at com.bumptech.glide.load.engine.DecodeJob.run(DecodeJob.java:233)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
        at java.lang.Thread.run(Thread.java:841)
        at com.bumptech.glide.load.engine.executor.GlideExecutor$DefaultThreadFactory$1.run(GlideExecutor.java:446)

Steps to Reproduce

Bitmap background = xxx;
Glide.with(this).load(background)
                        .apply(RequestOptions.bitmapTransform(new BlurTransformation(20, 8)))
                        .into(binder.blurry);

OS details

It works fine on Android 5.0+, and throws exceptions on Android 4.4

• Device: Emulator, Wiko
• OS: Android 4.4