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jsowell-pile/src/main/java/com/jsowell/wxpay/utils/BufferedImageLuminanceSource.java

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+package com.jsowell.wxpay.utils;
+ 
+import com.google.zxing.LuminanceSource;
+
+import java.awt.*;
+import java.awt.geom.AffineTransform;
+import java.awt.image.BufferedImage;
+
+public class BufferedImageLuminanceSource extends LuminanceSource {
+ 
+	private final BufferedImage image;
+	private final int left;
+	private final int top;
+ 
+	public BufferedImageLuminanceSource(BufferedImage image) {
+		this(image, 0, 0, image.getWidth(), image.getHeight());
+	}
+ 
+	public BufferedImageLuminanceSource(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;
+	}
+ 
+	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 (row == null || row.length < width) {
+			row = new byte[width];
+		}
+		image.getRaster().getDataElements(left, top + y, width, 1, row);
+		return row;
+	}
+ 
+	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;
+	}
+ 
+	public boolean isCropSupported() {
+		return true;
+	}
+ 
+	public LuminanceSource crop(int left, int top, int width, int height) {
+		return new BufferedImageLuminanceSource(image, this.left + left, this.top + top, width, height);
+	}
+ 
+	public boolean isRotateSupported() {
+		return true;
+	}
+ 
+	public 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 BufferedImageLuminanceSource(rotatedImage, top, sourceWidth - (left + width), getHeight(), width);
+	}
+ 
+}