I am implementing Gaussian blurring using the ScriptIntrinsicBlur class.
However, I have faced an intermittent issue where sometimes
ScriptIntrinsicBlur.create() throws RSRuntimeException: Internal error:
Object id 0.
Here is the most stacktrace that I can post:
android.renderscript.RSRuntimeException: Internal error: Object id 0.
at android.renderscript.BaseObj.getID(BaseObj.java:57)
at android.renderscript.Script.setVar(Script.java:202)
at
android.renderscript.ScriptIntrinsicBlur.setRadius(ScriptIntrinsicBlur.java:80)
at
android.renderscript.ScriptIntrinsicBlur.create(ScriptIntrinsicBlur.java:54)
The bitmap that is being blurred is usually around 300*300 ~ 400*400 pixels
and the blurRadius is set to 20.
private static Bitmap blurBitmap(Context context, Bitmap bm, float
blurRadius) {
if (context == null || bm == null || blurRadius < 0) {
return null;
}
try {
/* Make image width a multiple of 4. This is to avoid a bug in
the
* implementation of ScriptIntrinsicBlur that causes visual
* artifacts Source:
* https://plus.google.com/+RomanNurik/posts/TLkVQC3M6jW */
if (bm.getWidth() % 4 != 0) {
bm = Bitmap.createBitmap(bm, 0, 0, bm.getWidth() -
(bm.getWidth() % 4), bm.getHeight());
}
final RenderScript rs = RenderScript.create(context);
final Allocation input = Allocation.createFromBitmap(rs, bm,
Allocation.MipmapControl.MIPMAP_NONE,
Allocation.USAGE_SCRIPT);
final Allocation output = Allocation.createTyped(rs,
input.getType());
final ScriptIntrinsicBlur script =
ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));
script.setRadius(blurRadius);
script.setInput(input);
script.forEach(output);
output.copyTo(bm);
} catch (RSRuntimeException e) {
/* Throws android.renderscript.RSRuntimeException: Internal
error:
* Object id 0. */
}
return bm;
}
The exception is being thrown when create() is being called. I traced the
ScriptIntrinsicBlur.create() method and it am guessing that my problem
starts here:
int id = rs.nScriptIntrinsicCreate(5, e.getID(rs));
ScriptIntrinsicBlur sib = new ScriptIntrinsicBlur(id, rs);
sib.setRadius(5.f);
I am guessing that the native method nScriptIntrinsicCreate() may be
returning 0, which is passed to the constructor, then when setRadius() is
called it does a check and throws the exception. My questions are:
1. What does nScriptIntrinsicCreate() do and what can cause
nScriptIntrinsicCreate() to return 0?
2. How do you go about debugging native methods?
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