Nullpointer exception with Video Library and Processing 4 about deep-vision-processing

[cansik]

The problem can be reproduced with the following example:

import processing.video.*;

import java.awt.image.*;
import java.nio.*;

Capture cam;

void setup() {
  size(640, 480);
  cam = new Capture(this, "pipeline:autovideosrc");
  cam.start();
}

void draw() {
  if (cam.available() == true) {
    cam.read();
  }

  image(cam, 0, 0, width, height);

  // expect NPE in Processing 4.0a3
  demo(cam);
}

void demo(PImage img) {
  BufferedImage image = (BufferedImage) img.getNative();
  WritableRaster raster = image.getRaster();
  DataBuffer dataBuffer = raster.getDataBuffer();
  DataBufferInt pixelBuffer = (DataBufferInt)dataBuffer;
  int[] pixels = pixelBuffer.getData();

  println("Pixels: " + pixels.length);
}

This code is used in OpenCV for Processing to convert a PImage into a Mat.
Related to benfry/processing4#80 (removal of AWT in PImage)

[cansik]

Fixed by using internal PImage.pixels directly. Please use loadPixels() if necessary (96065fb)