package com.fangxu.dota2helper.util; import android.content.Context; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Paint; import android.support.v8.renderscript.Allocation; import android.support.v8.renderscript.Element; import android.support.v8.renderscript.RenderScript; import android.support.v8.renderscript.ScriptIntrinsicBlur; import com.bumptech.glide.Glide; import com.bumptech.glide.load.Transformation; import com.bumptech.glide.load.engine.Resource; import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool; import com.bumptech.glide.load.resource.bitmap.BitmapResource; public class BlurTransformation implements Transformation<Bitmap> { private static int DEFAULT_RADIUS = 5; private static int DEFAULT_DOWN_SAMPLING = 1; private Context mContext; private BitmapPool mBitmapPool; private int mRadius; private int mSampling; public BlurTransformation(Context context) { this(context, Glide.get(context).getBitmapPool(), DEFAULT_RADIUS, DEFAULT_DOWN_SAMPLING); } public BlurTransformation(Context context, BitmapPool pool) { this(context, pool, DEFAULT_RADIUS, DEFAULT_DOWN_SAMPLING); } public BlurTransformation(Context context, BitmapPool pool, int radius) { this(context, pool, radius, DEFAULT_DOWN_SAMPLING); } public BlurTransformation(Context context, int radius) { this(context, Glide.get(context).getBitmapPool(), radius, DEFAULT_DOWN_SAMPLING); } public BlurTransformation(Context context, int radius, int sampling) { this(context, Glide.get(context).getBitmapPool(), radius, sampling); } public BlurTransformation(Context context, BitmapPool pool, int radius, int sampling) { mContext = context.getApplicationContext(); mBitmapPool = pool; mRadius = radius; mSampling = sampling; } @Override public Resource<Bitmap> transform(Resource<Bitmap> resource, int outWidth, int outHeight) { Bitmap source = resource.get(); int width = source.getWidth(); int height = source.getHeight(); int scaledWidth = width / mSampling; int scaledHeight = height / mSampling; Bitmap bitmap = mBitmapPool.get(scaledWidth, scaledHeight, Bitmap.Config.ARGB_8888); if (bitmap == null) { bitmap = Bitmap.createBitmap(scaledWidth, scaledHeight, Bitmap.Config.ARGB_8888); } Canvas canvas = new Canvas(bitmap); canvas.scale(1 / (float) mSampling, 1 / (float) mSampling); Paint paint = new Paint(); paint.setFlags(Paint.FILTER_BITMAP_FLAG); canvas.drawBitmap(source, 0, 0, paint); RenderScript rs = RenderScript.create(mContext); Allocation input = Allocation.createFromBitmap(rs, bitmap, Allocation.MipmapControl.MIPMAP_NONE, Allocation.USAGE_SCRIPT); Allocation output = Allocation.createTyped(rs, input.getType()); ScriptIntrinsicBlur blur = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs)); blur.setInput(input); blur.setRadius(mRadius); blur.forEach(output); output.copyTo(bitmap); rs.destroy(); return BitmapResource.obtain(bitmap, mBitmapPool); } @Override public String getId() { return "BlurTransformation(radius=" + mRadius + ", sampling=" + mSampling + ")"; } }