Square image using custom camera

Question

I open the camera using viewview and custom view. using this, I can successfully click the image using one of the sizes from getSupportedPictureSizes (). But I want pictures in a square shape. Right now I'm cropping it after clicking on the picture. In android, it is possible to show a bright vivid image and a dark overlay with the rest of the camera preview, and when clicked, only viewing inside the square opens. this is possible on the iPhone. but don’t know how to do it in Android. Any help would be greatly appreciated.

Answer 1

Yes, you can overlay SurfaceView with two translucent rectangles to cut a square.

You must calculate the expected crop effect on the captured welcome image. For example. if your camera supports an image size of 4368x2912, you need to crop (mLeft = 728, mTop = 0, mWidth = 2912, mHeight = 2912).

To apply custom cropping to Jpeg byte[] obtained from onPictureTaken () , you have two options: simple or efficient.

A simple way is to decode Jpeg data for a bitmap,

 @Override public void onPictureTaken(final byte[] data, Camera camera) { Bitmap picture = BitmapFactory.decodeByteArray(data, 0, data.length); picture = Bitmap.createBitmap(picture, mLeft, mTop, mWidth, mHeight); picture.compress(Bitmap.CompressFormat.JPEG, 85, mFileOutputStream); } 

The disadvantages are that it can be slow and requires huge memory (maybe 60 megabytes for a camera with a resolution of 12 megapixels).

A smart approach is to use the Jpeg Lossless transform (see, for example, http://mediachest.sourceforge.net/mediautil/ ), using less than 10 megabytes. Note that this imposes some limitations, for example. in the example of the 12 megapixel camera above you might need mLeft = 720 because 728 is not divisible by 16.