Gets input from a Vuforia AR Camera and assigns it to a UnityEngine.Texture2D

CaptureScreen.cs

using UnityEngine;
using System.Collections;
using System.IO;
using MultiFormatReader = com.google.zxing.MultiFormatReader;

public class TakeScreenshot : MonoBehaviour {
  
  public GUITexture mainProduct;
  private MultiFormatReader reader;
  
  void Start() {
    reader = new MultiFormatReader();
  }

  void OnMouseUp() { // for debugging only, the touch input is what counts for mobile
    StartCoroutine(ScreenshotEncode());
  }
  
  // Update is called once per frame
  void Update () {
    if(Input.touchCount == 1) {
      Touch touch = Input.touches[0];
      
      if(touch.phase == TouchPhase.Ended && guiTexture.HitTest(touch.position)) {
        StartCoroutine(ScreenshotEncode());
      }
    }
  }
  
  IEnumerator ScreenshotEncode() {
    // wait for graphics to render
    yield return new WaitForEndOfFrame();

    // create a texture to pass to encoding
    Texture2D t = new Texture2D(Screen.width, Screen.height, TextureFormat.RGB24, false);

    // put buffer into texture
    t.ReadPixels(new Rect(0, 0, Screen.width, Screen.height), 0, 0);
    t.Apply();
    
    // i'm assigning it to a GUI Texture here for testing
    mainProduct.guiTexture.texture = t;
    
    // what i really want is to pass this texture as input to MultiFormatReader so I can read barcodes.
    // reader.decode(t);
  } 
}