/*
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* Copyright 2009 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.stylefeng.guns.core.qr;
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import com.google.zxing.common.BitMatrix;
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import javax.imageio.ImageIO;
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import java.awt.image.BufferedImage;
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import java.io.File;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.nio.file.Path;
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/**
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* Writes a {@link BitMatrix} to {@link BufferedImage},
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* file or stream. Provided here instead of core since it depends on
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* Java SE libraries.
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*
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* @author Sean Owen
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*/
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public final class MatrixToImageWriter {
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private static final MatrixToImageConfig DEFAULT_CONFIG = new MatrixToImageConfig();
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private MatrixToImageWriter() {}
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/**
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* Renders a {@link BitMatrix} as an image, where "false" bits are rendered
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* as white, and "true" bits are rendered as black.
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*/
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public static BufferedImage toBufferedImage(BitMatrix matrix) {
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return toBufferedImage(matrix, DEFAULT_CONFIG);
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}
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/**
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* As {@link #toBufferedImage(BitMatrix)}, but allows customization of the output.
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*/
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public static BufferedImage toBufferedImage(BitMatrix matrix, MatrixToImageConfig config) {
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int width = matrix.getWidth();
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int height = matrix.getHeight();
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BufferedImage image = new BufferedImage(width, height, config.getBufferedImageColorModel());
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int onColor = config.getPixelOnColor();
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int offColor = config.getPixelOffColor();
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for (int x = 0; x < width; x++) {
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for (int y = 0; y < height; y++) {
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image.setRGB(x, y, matrix.get(x, y) ? onColor : offColor);
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}
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}
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return image;
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}
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/**
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* @deprecated use {@link #writeToPath(BitMatrix, String, Path)}
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*/
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@Deprecated
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public static void writeToFile(BitMatrix matrix, String format, File file) throws IOException {
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writeToPath(matrix, format, file.toPath());
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}
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/**
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* Writes a {@link BitMatrix} to a file.
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*
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* @see #toBufferedImage(BitMatrix)
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*/
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public static void writeToPath(BitMatrix matrix, String format, Path file) throws IOException {
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writeToPath(matrix, format, file, DEFAULT_CONFIG);
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}
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/**
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* @deprecated use {@link #writeToPath(BitMatrix, String, Path, MatrixToImageConfig)}
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*/
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@Deprecated
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public static void writeToFile(BitMatrix matrix, String format, File file, MatrixToImageConfig config)
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throws IOException {
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writeToPath(matrix, format, file.toPath(), config);
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}
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/**
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* As {@link #writeToFile(BitMatrix, String, File)}, but allows customization of the output.
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*/
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public static void writeToPath(BitMatrix matrix, String format, Path file, MatrixToImageConfig config)
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throws IOException {
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BufferedImage image = toBufferedImage(matrix, config);
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if (!ImageIO.write(image, format, file.toFile())) {
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throw new IOException("Could not write an image of format " + format + " to " + file);
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}
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}
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/**
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* Writes a {@link BitMatrix} to a stream.
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*
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* @see #toBufferedImage(BitMatrix)
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*/
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public static void writeToStream(BitMatrix matrix, String format, OutputStream stream) throws IOException {
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writeToStream(matrix, format, stream, DEFAULT_CONFIG);
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}
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/**
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* As {@link #writeToStream(BitMatrix, String, OutputStream)}, but allows customization of the output.
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*/
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public static void writeToStream(BitMatrix matrix, String format, OutputStream stream, MatrixToImageConfig config)
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throws IOException {
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BufferedImage image = toBufferedImage(matrix, config);
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if (!ImageIO.write(image, format, stream)) {
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throw new IOException("Could not write an image of format " + format);
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}
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}
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}
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