How to cut part of a bitmap?

Question

I want to create a Bitmap that its content is a part of another Bitmap

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For example:

I have a Bitmap (400x900)
width = 400
height = 900

I want to cut it in the dimensions (400x400) in order to leave the height equal to the width ignoring the rest of the image.

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The result should stay this way:

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I built this algorithm, but it takes too long running:

private Bitmap reparteImage(Bitmap bitmap) {
    int w = bitmap.getWidth();
    //PASSA WIDTH PARA WIDTH E HEIGHT
    Bitmap bmp = Bitmap.createBitmap(w, w, Bitmap.Config.ARGB_8888); // this creates a MUTABLE bitmap
    for(int x=0;x<bmp.getWidth();x++){
        for(int y=0;y<bmp.getHeight();y++){
            bmp.setPixel(x, y, bitmap.getPixel(x, y));
        }
    }
    return bmp;
}

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There is a faster way to perform this procedure using Canvas or some other class that works with Images?

Answer 1

Use the static method createBitmap() of the Bitmap class:

Bitmap createBitmap (Bitmap source, int x, int y, int width, int height)

In your case use it like this:

Bitmap croppedBitmap = Bitmap.createBitmap(bitmapSource, 0, 0, 400, 400);