camera2 api watermark on images

Question

I am using camera2 API in my android app and i want to make some png watermark on images, please if its possible help me to make it thank you in advance. in other words, I want to make png watermark on captured photos is it possible? in my opinion, camera2 API must have some method to make it but I havnt arrange of finding something on the internet there is not a lot of documentation, so i hope you know something about it.

 private void takePicture() {
        if(cameraDevice == null)
            return;
        CameraManager manager = (CameraManager)getSystemService(Context.CAMERA_SERVICE);
        try{
            CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraDevice.getId());
            Size[] jpegSizes = null;
            if(characteristics != null)
                jpegSizes = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP)
                        .getOutputSizes(ImageFormat.JPEG);

            //Capture image with custom size
            int width = 1000;
            int height = 1000;
            /*
            if(jpegSizes != null && jpegSizes.length > 0)
            {
                width = jpegSizes[0].getWidth();
                height = jpegSizes[0].getHeight();
            }
            */
            final ImageReader reader = ImageReader.newInstance(width,height,ImageFormat.JPEG,1);
            List<Surface> outputSurface = new ArrayList<>(2);
            outputSurface.add(reader.getSurface());
            outputSurface.add(new Surface(textureView.getSurfaceTexture()));

            final CaptureRequest.Builder captureBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
            captureBuilder.addTarget(reader.getSurface());
            captureBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);

            //Check orientation base on device
            int rotation = getWindowManager().getDefaultDisplay().getRotation();
            captureBuilder.set(CaptureRequest.JPEG_ORIENTATION,ORIENTATIONS.get(rotation));

            file = new File(Environment.getExternalStorageDirectory()+"/"+UUID.randomUUID().toString()+".jpg");
            ImageReader.OnImageAvailableListener readerListener = new ImageReader.OnImageAvailableListener() {
                @Override
                public void onImageAvailable(ImageReader imageReader) {
                    Image image = null;
                    try{
                        image = reader.acquireLatestImage();
                        ByteBuffer buffer = image.getPlanes()[0].getBuffer();
                        byte[] bytes = new byte[buffer.capacity()];
                        buffer.get(bytes);
                        save(bytes);

                    }
                    catch (FileNotFoundException e)
                    {
                        e.printStackTrace();
                    }
                    catch (IOException e)
                    {
                        e.printStackTrace();
                    }
                    finally {
                        {
                            if(image != null)
                                image.close();
                        }
                    }
                }
                private void save(byte[] bytes) throws IOException {
                    OutputStream outputStream = null;
                    try{
                        outputStream = new FileOutputStream(file);
                        outputStream.write(bytes);
                    }finally {
                        if(outputStream != null)
                            outputStream.close();
                    }
                }
            };

            reader.setOnImageAvailableListener(readerListener,mBackgroundHandler);
            final CameraCaptureSession.CaptureCallback captureListener = new CameraCaptureSession.CaptureCallback() {
                @Override
                public void onCaptureCompleted(@NonNull CameraCaptureSession session, @NonNull CaptureRequest request, @NonNull TotalCaptureResult result) {
                    super.onCaptureCompleted(session, request, result);
                    Toast.makeText(MainActivity.this, "Saved "+file, Toast.LENGTH_SHORT).show();
                    createCameraPreview();
                }
            };

            cameraDevice.createCaptureSession(outputSurface, new CameraCaptureSession.StateCallback() {
                @Override
                public void onConfigured(@NonNull CameraCaptureSession cameraCaptureSession) {
                    try{
                        cameraCaptureSession.capture(captureBuilder.build(),captureListener,mBackgroundHandler);
                    } catch (CameraAccessException e) {
                        e.printStackTrace();
                    }
                }

                @Override
                public void onConfigureFailed(@NonNull CameraCaptureSession cameraCaptureSession) {

                }
            },mBackgroundHandler);


        } catch (CameraAccessException e) {
            e.printStackTrace();
        }

    }

PerracoLabs · Accepted Answer · 2019-01-28T13:38:01.153

Custom image manipulation is unrelated to any Camera API, and therefore there are no methods to apply any type of watermark.

The solution is to load the photo as a bitmap, render the watermark through a canvas initialized with the bitmap, and save it again.

Some considerations you need to take into account:

You will need to correctly manage the OutOfMemoryError if loading a large image. Here some tips to avoid any problem.
If saving again to JPEG, you may want to copy the original EXIF details to the new modified image.
You should perform all this operation in a background thread to avoid blocking the UI, as the operation definitely will be time consuming.

camera2 api watermark on images

1 Answers1