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Java SE-specific extensions to core ZXing library

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/*
 * Copyright 2012 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.zxing.client.j2se;

import java.awt.image.BufferedImage;

/**
 * Encapsulates custom configuration used in methods of {@link MatrixToImageWriter}.
 */
public final class MatrixToImageConfig {

  public static final int BLACK = 0xFF000000;
  public static final int WHITE = 0xFFFFFFFF;
  
  private final int onColor;
  private final int offColor;

  /**
   * Creates a default config with on color {@link #BLACK} and off color {@link #WHITE}, generating normal
   * black-on-white barcodes.
   */
  public MatrixToImageConfig() {
    this(BLACK, WHITE);
  }

  /**
   * @param onColor pixel on color, specified as an ARGB value as an int
   * @param offColor pixel off color, specified as an ARGB value as an int
   */
  public MatrixToImageConfig(int onColor, int offColor) {
    this.onColor = onColor;
    this.offColor = offColor;
  }

  public int getPixelOnColor() {
    return onColor;
  }

  public int getPixelOffColor() {
    return offColor;
  }

  int getBufferedImageColorModel() {
    if (onColor == BLACK && offColor == WHITE) {
      // Use faster BINARY if colors match default
      return BufferedImage.TYPE_BYTE_BINARY;
    }
    if (hasTransparency(onColor) || hasTransparency(offColor)) {
      // Use ARGB representation if colors specify non-opaque alpha
      return BufferedImage.TYPE_INT_ARGB;
    }
    // Default otherwise to RGB representation with ignored alpha channel
    return BufferedImage.TYPE_INT_RGB;
  }

  private static boolean hasTransparency(int argb) {
    return (argb & 0xFF000000) != 0xFF000000;
  }

}