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* *
* The MIT License (MIT) *
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* Copyright (c) 2015-2021 aoju.org and other contributors. *
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package org.aoju.bus.extra.qrcode;
import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
/**
* {@link BufferedImage} 图片二维码源
* 来自：http://blog.csdn.net/yangxin_blog/article/details/50850701
* 此类同样在zxing-j2se包中也有提供
*
* @author Kimi Liu
* @version 6.2.2
* @since JDK 1.8+
*/
public final class LuminanceSource extends com.google.zxing.LuminanceSource {
private final BufferedImage image;
private final int left;
private final int top;
/**
* 构造
*
* @param image {@link BufferedImage}
*/
public LuminanceSource(BufferedImage image) {
this(image, 0, 0, image.getWidth(), image.getHeight());
}
/**
* 构造
*
* @param image {@link BufferedImage}
* @param left 左边间隔
* @param top 顶部间隔
* @param width 宽度
* @param height 高度
*/
public LuminanceSource(BufferedImage image, int left, int top, int width, int height) {
super(width, height);
int sourceWidth = image.getWidth();
int sourceHeight = image.getHeight();
if (left + width > sourceWidth || top + height > sourceHeight) {
throw new IllegalArgumentException("Crop rectangle does not fit within image data.");
}
for (int y = top; y < top + height; y++) {
for (int x = left; x < left + width; x++) {
if ((image.getRGB(x, y) & 0xFF000000) == 0) {
image.setRGB(x, y, 0xFFFFFFFF); // = white
}
}
}
this.image = new BufferedImage(sourceWidth, sourceHeight, BufferedImage.TYPE_BYTE_GRAY);
this.image.getGraphics().drawImage(image, 0, 0, null);
this.left = left;
this.top = top;
}
@Override
public byte[] getRow(int y, byte[] row) {
if (y < 0 || y >= getHeight()) {
throw new IllegalArgumentException("Requested row is outside the image: " + y);
}
int width = getWidth();
if (null == row || row.length < width) {
row = new byte[width];
}
image.getRaster().getDataElements(left, top + y, width, 1, row);
return row;
}
@Override
public byte[] getMatrix() {
int width = getWidth();
int height = getHeight();
int area = width * height;
byte[] matrix = new byte[area];
image.getRaster().getDataElements(left, top, width, height, matrix);
return matrix;
}
@Override
public boolean isCropSupported() {
return true;
}
@Override
public com.google.zxing.LuminanceSource crop(int left, int top, int width, int height) {
return new LuminanceSource(image, this.left + left, this.top + top, width, height);
}
@Override
public boolean isRotateSupported() {
return true;
}
@Override
public com.google.zxing.LuminanceSource rotateCounterClockwise() {
int sourceWidth = image.getWidth();
int sourceHeight = image.getHeight();
AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0, 0.0, 0.0, sourceWidth);
BufferedImage rotatedImage = new BufferedImage(sourceHeight, sourceWidth, BufferedImage.TYPE_BYTE_GRAY);
Graphics2D g = rotatedImage.createGraphics();
g.drawImage(image, transform, null);
g.dispose();
int width = getWidth();
return new LuminanceSource(rotatedImage, top, sourceWidth - (left + width), getHeight(), width);
}
}
