PaintUtil.java

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// -*- mode: java; c-basic-offset: 2; -*-
// Copyright 2009-2011 Google, All Rights reserved
// Copyright 2011-2017 MIT, All rights reserved
// Released under the Apache License, Version 2.0
// http://www.apache.org/licenses/LICENSE-2.0
 
package com.google.appinventor.components.runtime.util;
 
import android.graphics.Paint;
import android.graphics.PorterDuffXfermode;
 
public class PaintUtil {
  private PaintUtil() {}
 
  public static void changePaint(Paint paint, int argb) {
    // TODO(user): can the following two lines can be replaced by:
    // paint.setColor(argb)?
    paint.setColor(argb & 0x00FFFFFF);
    paint.setAlpha((argb >> 24) & 0xFF);
    paint.setXfermode(null);
  }
 
  public static void changePaintTransparent(Paint paint) {
    paint.setAlpha(0x00);
    paint.setXfermode(new PorterDuffXfermode(android.graphics.PorterDuff.Mode.CLEAR));
  }
 
  public static int hexStringToInt(String argb) {
    String unprefixed = argb;
    if (argb.startsWith("#x") || argb.startsWith("&H")) {
      unprefixed = argb.substring(2);
    }
    // Integer.parseInt will throw
    long l = Long.parseLong(unprefixed, 16);
    if (l > Integer.MAX_VALUE) {
      l += 2 * Integer.MIN_VALUE;
    }
    return (int) l;
  }
}