Question

I am drawing on canvas using an array as the pixels:

 g.drawBitmap(imageBuffer, offset, stride, 0, 0, width, height, false, mPaint);

since imageBuffer is an array, not bitmap, how to I rotate while minimizing the extra effort to copy data in memory?

Answer 1

Assuming that g is the canvas, into which you’re drawing, you can easily do this with:

g.save();
g.rotate(degrees);
g.drawBitmap(imageBuffer, offset, stride, 0, 0, width, height, false, mPaint);
g.restore();

And that should be it.