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import android.content.Context; | |
import android.graphics.Bitmap; | |
import android.renderscript.Allocation; | |
import android.renderscript.Element; | |
import android.renderscript.RenderScript; | |
import android.renderscript.ScriptIntrinsicBlur; | |
import com.squareup.picasso.Transformation; | |
public class BlurTransform implements Transformation { | |
RenderScript rs; | |
public BlurTransform(Context context) { | |
super(); | |
rs = RenderScript.create(context); | |
} | |
@Override | |
public Bitmap transform(Bitmap bitmap) { | |
// Create another bitmap that will hold the results of the filter. | |
Bitmap blurredBitmap = Bitmap.createBitmap(bitmap); | |
// Allocate memory for Renderscript to work with | |
Allocation input = Allocation.createFromBitmap(rs, bitmap, Allocation.MipmapControl.MIPMAP_FULL, Allocation.USAGE_SHARED); | |
Allocation output = Allocation.createTyped(rs, input.getType()); | |
// Load up an instance of the specific script that we want to use. | |
ScriptIntrinsicBlur script = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs)); | |
script.setInput(input); | |
// Set the blur radius | |
script.setRadius(10); | |
// Start the ScriptIntrinisicBlur | |
script.forEach(output); | |
// Copy the output to the blurred bitmap | |
output.copyTo(blurredBitmap); | |
return blurredBitmap; | |
} | |
@Override | |
public String key() { | |
return "blur"; | |
} | |
} |
Hmm, so I realize that be re-adding the recycle() call my image is not getting cached. So if I don't want to recycle I get the error mentioned above ("Transformation blur mutated input Bitmap but failed to recycle the original.").
Any idea how I can avoid this? Or is there no way to resize and blur an image at the same time?
Quick note: you shouldn't creating a new RS instance in the constructor, which gets called every time - even when the blurred image is being loaded from memory. Instead, store a WeakReference<Context>
and create RenderScript inside of the transform method.
It requires api level 17
Thanks for posting this up.
I had to change one line to get things working in my case:
val blurredBitmap = Bitmap.createBitmap(bitmap)
to
val blurredBitmap = bitmap.copy(Bitmap.Config.ARGB_8888, true)
Problem was that BitMap.createBitmap() doesn't always create a copy - sometimes it reuses the bitmap. Looks like this was confusing Picasso's error checking in terms of whether or not the Transformation object correctly handled recycling.
Note that if you don't call bitmap.recycle than the following call will fail:
Picasso.with(getActivity())
.load(mClip.getImageUrl(app))
.resize(width, height)
.centerCrop()
.transform(new BlurTransform(getActivity()))
.into(mImageView);
with the following error: "Transformation blur mutated input Bitmap but failed to recycle the original."
So in this case I've re-added the .recycle() call.