CODEWITHSUNDEEP
androidimagebitmap
thedjdoorn
thedjdoorn

Reputation: 41

Bitmap is seen as immutable when caling getPixels()

I have the following code:

Bitmap mutableBitmap = result.bitmap.copy(Bitmap.Config.ARGB_8888, true);
Matrix matrix = new Matrix();
matrix.postRotate(-result.rotationDegrees);
Bitmap rotatedBitmap = Bitmap.createBitmap(mutableBitmap, 0, 0, mutableBitmap.getWidth(), mutableBitmap.getHeight(), matrix, true);
int[] intValues = new int[INPUT_SIZE*INPUT_SIZE];
rotatedBitmap.getPixels(intValues, 0, rotatedBitmap.getWidth(), 0, 0, rotatedBitmap.getWidth(), rotatedBitmap.getHeight());

An IllegalStateException is thrown in the eraseColor method with the message cannot erase immutable bitmaps when rotatedBitmap.getPixels is called. Obviously, both mutableBitmap and rotatedBitmap are mutable bitmaps, that's why they exist, and the debugger confirms this as well. For completeness, INPUT_SIZE is the screen width and result is a PhotoResult object from FotoApparat.

So why is this exception thrown?

Upvotes: 0

Views: 106

Answers (1)

Frank
Frank

Reputation: 12300

I think your specific createBitmap method does not create a mutable bitmap:

https://developer.android.com/reference/android/graphics/Bitmap.html#createBitmap(android.graphics.Bitmap, int, int, int, int, android.graphics.Matrix, boolean)

"Returns an immutable bitmap from subset of the source bitmap, transformed by the optional matrix."

Upvotes: 2

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