mirror of
https://gitee.com/chinabugotech/hutool.git
synced 2025-05-09 23:51:34 +08:00
del gif
This commit is contained in:
Looly
parent
772d80a8be
commit
cf8c890e8d
@ -100,6 +100,18 @@ public class ZipWriter implements Closeable {
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return this;
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}
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/**
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* 设置压缩方式
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*
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* @param method 压缩方式，支持{@link ZipOutputStream#DEFLATED}和{@link ZipOutputStream#STORED}
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* @return this
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* @since 6.0.0
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*/
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public ZipWriter setMethod(final int method) {
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this.out.setMethod(method);
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return this;
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}
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/**
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* 获取原始的{@link ZipOutputStream}
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*
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@ -233,9 +245,10 @@ public class ZipWriter implements Closeable {
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* @param filter 文件过滤器，通过实现此接口，自定义要过滤的文件（过滤掉哪些文件或文件夹不加入压缩），{@code null}表示不过滤
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* @throws IORuntimeException IO异常
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*/
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private ZipWriter _add(final File file, final String srcRootDir, final FileFilter filter) throws IORuntimeException {
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@SuppressWarnings("resource")
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private void _add(final File file, final String srcRootDir, final FileFilter filter) throws IORuntimeException {
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if (null == file || (null != filter && false == filter.accept(file))) {
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return this;
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return;
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}
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// 获取文件相对于压缩文件夹根目录的子路径
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@ -256,7 +269,6 @@ public class ZipWriter implements Closeable {
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// 如果是文件或其它符号，则直接压缩该文件
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putEntry(subPath, FileUtil.getInputStream(file));
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}
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return this;
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}
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/**
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@ -38,6 +38,7 @@ import java.io.Writer;
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import java.nio.CharBuffer;
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import java.nio.charset.Charset;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.util.Collection;
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import java.util.Objects;
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@ -527,12 +528,24 @@ public class IoUtil extends NioUtil {
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/**
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* 文件转为{@link InputStream}
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*
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* @param file 文件
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* @param file 文件，非空
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* @return {@link InputStream}
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*/
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public static InputStream toStream(final File file) {
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Assert.notNull(file);
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return toStream(file.toPath());
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}
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/**
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* 文件转为{@link InputStream}
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*
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* @param path {@link Path}，非空
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* @return {@link InputStream}
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*/
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public static InputStream toStream(final Path path) {
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Assert.notNull(path);
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try {
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return Files.newInputStream(file.toPath());
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return Files.newInputStream(path);
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} catch (final IOException e) {
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throw new IORuntimeException(e);
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}
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@ -27,6 +27,12 @@
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<version>${project.parent.version}</version>
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</dependency>
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<!-- 图片 -->
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<dependency>
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<groupId>com.madgag</groupId>
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<artifactId>animated-gif-lib</artifactId>
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<version>1.4</version>
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<optional>true</optional>
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</dependency>
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<dependency>
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<groupId>com.drewnoakes</groupId>
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<artifactId>metadata-extractor</artifactId>
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@ -1,9 +1,9 @@
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package cn.hutool.swing.captcha;
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import cn.hutool.swing.img.gif.AnimatedGifEncoder;
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import cn.hutool.core.util.ObjUtil;
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import cn.hutool.core.util.RandomUtil;
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import com.madgag.gif.fmsware.AnimatedGifEncoder;
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import java.awt.AlphaComposite;
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import java.awt.Color;
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@ -1,583 +0,0 @@
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package cn.hutool.swing.img.gif;
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import java.awt.Color;
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import java.awt.Graphics2D;
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import java.awt.image.BufferedImage;
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import java.awt.image.DataBufferByte;
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import java.io.BufferedOutputStream;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.nio.file.Files;
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import java.nio.file.Paths;
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/**
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* 动态GIF动画生成器，可生成一个或多个帧的GIF。
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*
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* <pre>
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* Example:
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* AnimatedGifEncoder e = new AnimatedGifEncoder();
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* e.start(outputFileName);
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* e.setDelay(1000); // 1 frame per sec
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* e.addFrame(image1);
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* e.addFrame(image2);
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* e.finish();
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* </pre>
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* <p>
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* 来自：<a href="https://github.com/rtyley/animated-gif-lib-for-java">https://github.com/rtyley/animated-gif-lib-for-java</a>
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*
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* @author Kevin Weiner, FM Software
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* @version 1.03 November 2003
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* @since 5.3.8
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*/
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public class AnimatedGifEncoder {
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protected int width; // image size
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protected int height;
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protected Color transparent = null; // transparent color if given
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protected boolean transparentExactMatch = false; // transparent color will be found by looking for the closest color
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// or for the exact color if transparentExactMatch == true
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protected Color background = null; // background color if given
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protected int transIndex; // transparent index in color table
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protected int repeat = -1; // no repeat
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protected int delay = 0; // frame delay (hundredths)
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protected boolean started = false; // ready to output frames
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protected OutputStream out;
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protected BufferedImage image; // current frame
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protected byte[] pixels; // BGR byte array from frame
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protected byte[] indexedPixels; // converted frame indexed to palette
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protected int colorDepth; // number of bit planes
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protected byte[] colorTab; // RGB palette
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protected boolean[] usedEntry = new boolean[256]; // active palette entries
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protected int palSize = 7; // color table size (bits-1)
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protected int dispose = -1; // disposal code (-1 = use default)
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protected boolean closeStream = false; // close stream when finished
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protected boolean firstFrame = true;
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protected boolean sizeSet = false; // if false, get size from first frame
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protected int sample = 10; // default sample interval for quantizer
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/**
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* 设置每一帧的间隔时间
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* Sets the delay time between each frame, or changes it
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* for subsequent frames (applies to last frame added).
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*
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* @param ms 间隔时间，单位毫秒
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*/
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public void setDelay(final int ms) {
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delay = Math.round(ms / 10.0f);
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}
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/**
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* Sets the GIF frame disposal code for the last added frame
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* and any subsequent frames. Default is 0 if no transparent
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* color has been set, otherwise 2.
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*
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* @param code int disposal code.
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*/
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public void setDispose(final int code) {
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if (code >= 0) {
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dispose = code;
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}
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}
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/**
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* Sets the number of times the set of GIF frames
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* should be played. Default is 1; 0 means play
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* indefinitely. Must be invoked before the first
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* image is added.
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*
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* @param iter int number of iterations.
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*/
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public void setRepeat(final int iter) {
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if (iter >= 0) {
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repeat = iter;
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}
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}
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/**
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* Sets the transparent color for the last added frame
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* and any subsequent frames.
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* Since all colors are subject to modification
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* in the quantization process, the color in the final
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* palette for each frame closest to the given color
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* becomes the transparent color for that frame.
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* May be set to null to indicate no transparent color.
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*
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* @param c Color to be treated as transparent on display.
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*/
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public void setTransparent(final Color c) {
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setTransparent(c, false);
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}
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/**
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* Sets the transparent color for the last added frame
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* and any subsequent frames.
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* Since all colors are subject to modification
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* in the quantization process, the color in the final
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* palette for each frame closest to the given color
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* becomes the transparent color for that frame.
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* If exactMatch is set to true, transparent color index
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* is search with exact match, and not looking for the
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* closest one.
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* May be set to null to indicate no transparent color.
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*
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* @param c Color to be treated as transparent on display.
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* @param exactMatch If exactMatch is set to true, transparent color index is search with exact match
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*/
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public void setTransparent(final Color c, final boolean exactMatch) {
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transparent = c;
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transparentExactMatch = exactMatch;
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}
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/**
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* Sets the background color for the last added frame
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* and any subsequent frames.
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* Since all colors are subject to modification
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* in the quantization process, the color in the final
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* palette for each frame closest to the given color
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* becomes the background color for that frame.
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* May be set to null to indicate no background color
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* which will default to black.
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*
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* @param c Color to be treated as background on display.
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*/
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public void setBackground(final Color c) {
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background = c;
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}
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/**
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* Adds next GIF frame. The frame is not written immediately, but is
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* actually deferred until the next frame is received so that timing
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* data can be inserted. Invoking {@code finish()} flushes all
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* frames. If {@code setSize} was not invoked, the size of the
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* first image is used for all subsequent frames.
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*
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* @param im BufferedImage containing frame to write.
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* @return true if successful.
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*/
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public boolean addFrame(final BufferedImage im) {
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if ((im == null) || !started) {
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return false;
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}
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boolean ok = true;
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try {
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if (!sizeSet) {
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// use first frame's size
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setSize(im.getWidth(), im.getHeight());
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}
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image = im;
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getImagePixels(); // convert to correct format if necessary
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analyzePixels(); // build color table & map pixels
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if (firstFrame) {
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writeLSD(); // logical screen descriptior
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writePalette(); // global color table
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if (repeat >= 0) {
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// use NS app extension to indicate reps
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writeNetscapeExt();
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}
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}
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writeGraphicCtrlExt(); // write graphic control extension
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writeImageDesc(); // image descriptor
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if (!firstFrame) {
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writePalette(); // local color table
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}
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writePixels(); // encode and write pixel data
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firstFrame = false;
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} catch (final IOException e) {
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ok = false;
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}
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return ok;
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}
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/**
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* Flushes any pending data and closes output file.
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* If writing to an OutputStream, the stream is not
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* closed.
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*
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* @return is ok
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*/
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public boolean finish() {
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if (!started) return false;
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boolean ok = true;
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started = false;
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try {
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out.write(0x3b); // gif trailer
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out.flush();
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if (closeStream) {
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out.close();
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}
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} catch (final IOException e) {
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ok = false;
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}
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// reset for subsequent use
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transIndex = 0;
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out = null;
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image = null;
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pixels = null;
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indexedPixels = null;
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colorTab = null;
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closeStream = false;
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firstFrame = true;
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return ok;
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}
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/**
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* Sets frame rate in frames per second. Equivalent to
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* {@code setDelay(1000/fps)}.
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*
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* @param fps float frame rate (frames per second)
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*/
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public void setFrameRate(final float fps) {
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if (fps != 0f) {
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delay = Math.round(100f / fps);
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}
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}
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/**
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* Sets quality of color quantization (conversion of images
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* to the maximum 256 colors allowed by the GIF specification).
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* Lower values (minimum = 1) produce better colors, but slow
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* processing significantly. 10 is the default, and produces
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* good color mapping at reasonable speeds. Values greater
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* than 20 do not yield significant improvements in speed.
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*
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* @param quality int greater than 0.
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*/
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public void setQuality(int quality) {
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if (quality < 1) quality = 1;
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sample = quality;
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}
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/**
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* Sets the GIF frame size. The default size is the
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* size of the first frame added if this method is
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* not invoked.
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*
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* @param w int frame width.
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* @param h int frame width.
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*/
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public void setSize(final int w, final int h) {
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if (started && !firstFrame) return;
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width = w;
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height = h;
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if (width < 1) width = 320;
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if (height < 1) height = 240;
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sizeSet = true;
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}
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/**
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* Initiates GIF file creation on the given stream. The stream
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* is not closed automatically.
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*
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* @param os OutputStream on which GIF images are written.
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* @return false if initial write failed.
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*/
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public boolean start(final OutputStream os) {
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if (os == null) return false;
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boolean ok = true;
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closeStream = false;
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out = os;
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try {
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writeString("GIF89a"); // header
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} catch (final IOException e) {
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ok = false;
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}
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return started = ok;
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}
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/**
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* Initiates writing of a GIF file with the specified name.
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*
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* @param file String containing output file name.
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* @return false if open or initial write failed.
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*/
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public boolean start(final String file) {
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boolean ok;
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try {
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out = new BufferedOutputStream(Files.newOutputStream(Paths.get(file)));
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ok = start(out);
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closeStream = true;
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} catch (final IOException e) {
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ok = false;
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}
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return started = ok;
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}
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/**
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* @return 是否开始
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*/
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public boolean isStarted() {
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return started;
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}
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/**
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* Analyzes image colors and creates color map.
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*/
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protected void analyzePixels() {
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final int len = pixels.length;
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final int nPix = len / 3;
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indexedPixels = new byte[nPix];
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final NeuQuant nq = new NeuQuant(pixels, len, sample);
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// initialize quantizer
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colorTab = nq.process(); // create reduced palette
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// convert map from BGR to RGB
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for (int i = 0; i < colorTab.length; i += 3) {
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final byte temp = colorTab[i];
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colorTab[i] = colorTab[i + 2];
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colorTab[i + 2] = temp;
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usedEntry[i / 3] = false;
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}
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// map image pixels to new palette
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int k = 0;
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for (int i = 0; i < nPix; i++) {
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final int index =
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nq.map(pixels[k++] & 0xff,
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pixels[k++] & 0xff,
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pixels[k++] & 0xff);
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usedEntry[index] = true;
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indexedPixels[i] = (byte) index;
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}
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pixels = null;
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colorDepth = 8;
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palSize = 7;
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// get the closest match to transparent color if specified
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if (transparent != null) {
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transIndex = transparentExactMatch ? findExact(transparent) : findClosest(transparent);
|
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}
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}
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/**
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* Returns index of palette color closest to c
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*
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* @param c Color
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* @return index
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*/
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protected int findClosest(final Color c) {
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if (colorTab == null) return -1;
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final int r = c.getRed();
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final int g = c.getGreen();
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final int b = c.getBlue();
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int minpos = 0;
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int dmin = 256 * 256 * 256;
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final int len = colorTab.length;
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for (int i = 0; i < len; ) {
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final int dr = r - (colorTab[i++] & 0xff);
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final int dg = g - (colorTab[i++] & 0xff);
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final int db = b - (colorTab[i] & 0xff);
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final int d = dr * dr + dg * dg + db * db;
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final int index = i / 3;
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if (usedEntry[index] && (d < dmin)) {
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dmin = d;
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minpos = index;
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}
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i++;
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}
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return minpos;
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}
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/**
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* Returns true if the exact matching color is existing, and used in the color palette, otherwise, return false.
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* This method has to be called before finishing the image,
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* because after finished the palette is destroyed, and it will always return false.
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*
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* @param c 颜色
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* @return 颜色是否存在
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*/
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boolean isColorUsed(final Color c) {
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return findExact(c) != -1;
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}
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/**
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* Returns index of palette exactly matching to color c or -1 if there is no exact matching.
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*
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* @param c Color
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* @return index
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*/
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protected int findExact(final Color c) {
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if (colorTab == null) {
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return -1;
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}
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||||
|
||||
final int r = c.getRed();
|
||||
final int g = c.getGreen();
|
||||
final int b = c.getBlue();
|
||||
final int len = colorTab.length / 3;
|
||||
for (int index = 0; index < len; ++index) {
|
||||
final int i = index * 3;
|
||||
// If the entry is used in colorTab, then check if it is the same exact color we're looking for
|
||||
if (usedEntry[index] && r == (colorTab[i] & 0xff) && g == (colorTab[i + 1] & 0xff) && b == (colorTab[i + 2] & 0xff)) {
|
||||
return index;
|
||||
}
|
||||
}
|
||||
return -1;
|
||||
}
|
||||
|
||||
/**
|
||||
* Extracts image pixels into byte array "pixels"
|
||||
*/
|
||||
protected void getImagePixels() {
|
||||
final int w = image.getWidth();
|
||||
final int h = image.getHeight();
|
||||
final int type = image.getType();
|
||||
if ((w != width)
|
||||
|| (h != height)
|
||||
|| (type != BufferedImage.TYPE_3BYTE_BGR)) {
|
||||
// create new image with right size/format
|
||||
final BufferedImage temp =
|
||||
new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);
|
||||
final Graphics2D g = temp.createGraphics();
|
||||
g.setColor(background);
|
||||
g.fillRect(0, 0, width, height);
|
||||
g.drawImage(image, 0, 0, null);
|
||||
image = temp;
|
||||
}
|
||||
pixels = ((DataBufferByte) image.getRaster().getDataBuffer()).getData();
|
||||
}
|
||||
|
||||
/**
|
||||
* Writes Graphic Control Extension
|
||||
*
|
||||
* @throws IOException IO异常
|
||||
*/
|
||||
protected void writeGraphicCtrlExt() throws IOException {
|
||||
out.write(0x21); // extension introducer
|
||||
out.write(0xf9); // GCE label
|
||||
out.write(4); // data block size
|
||||
final int transp;
|
||||
int disp;
|
||||
if (transparent == null) {
|
||||
transp = 0;
|
||||
disp = 0; // dispose = no action
|
||||
} else {
|
||||
transp = 1;
|
||||
disp = 2; // force clear if using transparent color
|
||||
}
|
||||
if (dispose >= 0) {
|
||||
disp = dispose & 7; // user override
|
||||
}
|
||||
disp <<= 2;
|
||||
|
||||
// packed fields
|
||||
//noinspection PointlessBitwiseExpression
|
||||
out.write(0 | // 1:3 reserved
|
||||
disp | // 4:6 disposal
|
||||
0 | // 7 user input - 0 = none
|
||||
transp); // 8 transparency flag
|
||||
|
||||
writeShort(delay); // delay x 1/100 sec
|
||||
out.write(transIndex); // transparent color index
|
||||
out.write(0); // block terminator
|
||||
}
|
||||
|
||||
/**
|
||||
* Writes Image Descriptor
|
||||
*
|
||||
* @throws IOException IO异常
|
||||
*/
|
||||
protected void writeImageDesc() throws IOException {
|
||||
out.write(0x2c); // image separator
|
||||
writeShort(0); // image position x,y = 0,0
|
||||
writeShort(0);
|
||||
writeShort(width); // image size
|
||||
writeShort(height);
|
||||
// packed fields
|
||||
if (firstFrame) {
|
||||
// no LCT - GCT is used for first (or only) frame
|
||||
out.write(0);
|
||||
} else {
|
||||
// specify normal LCT
|
||||
//noinspection PointlessBitwiseExpression
|
||||
out.write(0x80 | // 1 local color table 1=yes
|
||||
0 | // 2 interlace - 0=no
|
||||
0 | // 3 sorted - 0=no
|
||||
0 | // 4-5 reserved
|
||||
palSize); // 6-8 size of color table
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Writes Logical Screen Descriptor
|
||||
*
|
||||
* @throws IOException IO异常
|
||||
*/
|
||||
protected void writeLSD() throws IOException {
|
||||
// logical screen size
|
||||
writeShort(width);
|
||||
writeShort(height);
|
||||
// packed fields
|
||||
//noinspection PointlessBitwiseExpression
|
||||
out.write((0x80 | // 1 : global color table flag = 1 (gct used)
|
||||
0x70 | // 2-4 : color resolution = 7
|
||||
0x00 | // 5 : gct sort flag = 0
|
||||
palSize)); // 6-8 : gct size
|
||||
|
||||
out.write(0); // background color index
|
||||
out.write(0); // pixel aspect ratio - assume 1:1
|
||||
}
|
||||
|
||||
/**
|
||||
* Writes Netscape application extension to define
|
||||
* repeat count.
|
||||
*
|
||||
* @throws IOException IO异常
|
||||
*/
|
||||
protected void writeNetscapeExt() throws IOException {
|
||||
out.write(0x21); // extension introducer
|
||||
out.write(0xff); // app extension label
|
||||
out.write(11); // block size
|
||||
writeString("NETSCAPE" + "2.0"); // app id + auth code
|
||||
out.write(3); // sub-block size
|
||||
out.write(1); // loop sub-block id
|
||||
writeShort(repeat); // loop count (extra iterations, 0=repeat forever)
|
||||
out.write(0); // block terminator
|
||||
}
|
||||
|
||||
/**
|
||||
* Writes color table
|
||||
*
|
||||
* @throws IOException IO异常
|
||||
*/
|
||||
protected void writePalette() throws IOException {
|
||||
out.write(colorTab, 0, colorTab.length);
|
||||
final int n = (3 * 256) - colorTab.length;
|
||||
for (int i = 0; i < n; i++) {
|
||||
out.write(0);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Encodes and writes pixel data
|
||||
*
|
||||
* @throws IOException IO异常
|
||||
*/
|
||||
protected void writePixels() throws IOException {
|
||||
final LZWEncoder encoder = new LZWEncoder(width, height, indexedPixels, colorDepth);
|
||||
encoder.encode(out);
|
||||
}
|
||||
|
||||
/**
|
||||
* Write 16-bit value to output stream, LSB first
|
||||
*
|
||||
* @param value 16-bit value
|
||||
* @throws IOException IO异常
|
||||
*/
|
||||
protected void writeShort(final int value) throws IOException {
|
||||
out.write(value & 0xff);
|
||||
out.write((value >> 8) & 0xff);
|
||||
}
|
||||
|
||||
/**
|
||||
* Writes string to output stream
|
||||
*
|
||||
* @param s String
|
||||
* @throws IOException IO异常
|
||||
*/
|
||||
protected void writeString(final String s) throws IOException {
|
||||
for (int i = 0; i < s.length(); i++) {
|
||||
out.write((byte) s.charAt(i));
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -1,793 +0,0 @@
|
||||
package cn.hutool.swing.img.gif;
|
||||
|
||||
import cn.hutool.core.io.IoUtil;
|
||||
|
||||
import java.awt.AlphaComposite;
|
||||
import java.awt.Color;
|
||||
import java.awt.Dimension;
|
||||
import java.awt.Graphics2D;
|
||||
import java.awt.Rectangle;
|
||||
import java.awt.image.BufferedImage;
|
||||
import java.awt.image.DataBufferInt;
|
||||
import java.io.BufferedInputStream;
|
||||
import java.io.IOException;
|
||||
import java.io.InputStream;
|
||||
import java.net.URL;
|
||||
import java.nio.file.Files;
|
||||
import java.nio.file.Paths;
|
||||
import java.util.ArrayList;
|
||||
|
||||
/**
|
||||
* GIF文件解析
|
||||
* Class GifDecoder - Decodes a GIF file into one or more frames.
|
||||
* <p>
|
||||
* Example:
|
||||
*
|
||||
* <pre>
|
||||
* {@code
|
||||
* GifDecoder d = new GifDecoder();
|
||||
* d.read("sample.gif");
|
||||
* int n = d.getFrameCount();
|
||||
* for (int i = 0; i < n; i++) {
|
||||
* BufferedImage frame = d.getFrame(i); // frame i
|
||||
* int t = d.getDelay(i); // display duration of frame in milliseconds
|
||||
* // do something with frame
|
||||
* }
|
||||
* }
|
||||
* </pre>
|
||||
* <p>
|
||||
* 来自：<a href="https://github.com/rtyley/animated-gif-lib-for-java">https://github.com/rtyley/animated-gif-lib-for-java</a>
|
||||
*
|
||||
* @author Kevin Weiner, FM Software; LZW decoder adapted from John Cristy's ImageMagick.
|
||||
*/
|
||||
public class GifDecoder {
|
||||
|
||||
/**
|
||||
* File read status: No errors.
|
||||
*/
|
||||
public static final int STATUS_OK = 0;
|
||||
|
||||
/**
|
||||
* File read status: Error decoding file (may be partially decoded)
|
||||
*/
|
||||
public static final int STATUS_FORMAT_ERROR = 1;
|
||||
|
||||
/**
|
||||
* File read status: Unable to open source.
|
||||
*/
|
||||
public static final int STATUS_OPEN_ERROR = 2;
|
||||
|
||||
protected BufferedInputStream in;
|
||||
protected int status;
|
||||
|
||||
protected int width; // full image width
|
||||
protected int height; // full image height
|
||||
protected boolean gctFlag; // global color table used
|
||||
protected int gctSize; // size of global color table
|
||||
protected int loopCount = 1; // iterations; 0 = repeat forever
|
||||
|
||||
protected int[] gct; // global color table
|
||||
protected int[] lct; // local color table
|
||||
protected int[] act; // active color table
|
||||
|
||||
protected int bgIndex; // background color index
|
||||
protected int bgColor; // background color
|
||||
protected int lastBgColor; // previous bg color
|
||||
protected int pixelAspect; // pixel aspect ratio
|
||||
|
||||
protected boolean lctFlag; // local color table flag
|
||||
protected boolean interlace; // interlace flag
|
||||
protected int lctSize; // local color table size
|
||||
|
||||
protected int ix, iy, iw, ih; // current image rectangle
|
||||
protected Rectangle lastRect; // last image rect
|
||||
protected BufferedImage image; // current frame
|
||||
protected BufferedImage lastImage; // previous frame
|
||||
|
||||
protected byte[] block = new byte[256]; // current data block
|
||||
protected int blockSize = 0; // block size
|
||||
|
||||
// last graphic control extension info
|
||||
protected int dispose = 0;
|
||||
// 0=no action; 1=leave in place; 2=restore to bg; 3=restore to prev
|
||||
protected int lastDispose = 0;
|
||||
protected boolean transparency = false; // use transparent color
|
||||
protected int delay = 0; // delay in milliseconds
|
||||
protected int transIndex; // transparent color index
|
||||
|
||||
protected static final int MAX_STACK_SIZE = 4096;
|
||||
// max decoder pixel stack size
|
||||
|
||||
// LZW decoder working arrays
|
||||
protected short[] prefix;
|
||||
protected byte[] suffix;
|
||||
protected byte[] pixelStack;
|
||||
protected byte[] pixels;
|
||||
|
||||
protected ArrayList<GifFrame> frames; // frames read from current file
|
||||
protected int frameCount;
|
||||
|
||||
static class GifFrame {
|
||||
public GifFrame(final BufferedImage im, final int del) {
|
||||
image = im;
|
||||
delay = del;
|
||||
}
|
||||
|
||||
public BufferedImage image;
|
||||
public int delay;
|
||||
}
|
||||
|
||||
/**
|
||||
* Gets display duration for specified frame.
|
||||
*
|
||||
* @param n int index of frame
|
||||
* @return delay in milliseconds
|
||||
*/
|
||||
public int getDelay(final int n) {
|
||||
//
|
||||
delay = -1;
|
||||
if ((n >= 0) && (n < frameCount)) {
|
||||
delay = frames.get(n).delay;
|
||||
}
|
||||
return delay;
|
||||
}
|
||||
|
||||
/**
|
||||
* Gets the number of frames read from file.
|
||||
*
|
||||
* @return frame count
|
||||
*/
|
||||
public int getFrameCount() {
|
||||
return frameCount;
|
||||
}
|
||||
|
||||
/**
|
||||
* Gets the first (or only) image read.
|
||||
*
|
||||
* @return BufferedImage containing first frame, or null if none.
|
||||
*/
|
||||
public BufferedImage getImage() {
|
||||
return getFrame(0);
|
||||
}
|
||||
|
||||
/**
|
||||
* Gets the "Netscape" iteration count, if any.
|
||||
* A count of 0 means repeat indefinitiely.
|
||||
*
|
||||
* @return iteration count if one was specified, else 1.
|
||||
*/
|
||||
public int getLoopCount() {
|
||||
return loopCount;
|
||||
}
|
||||
|
||||
/**
|
||||
* Creates new frame image from current data (and previous
|
||||
* frames as specified by their disposition codes).
|
||||
*/
|
||||
protected void setPixels() {
|
||||
// expose destination image's pixels as int array
|
||||
final int[] dest =
|
||||
((DataBufferInt) image.getRaster().getDataBuffer()).getData();
|
||||
|
||||
// fill in starting image contents based on last image's dispose code
|
||||
if (lastDispose > 0) {
|
||||
if (lastDispose == 3) {
|
||||
// use image before last
|
||||
final int n = frameCount - 2;
|
||||
if (n > 0) {
|
||||
lastImage = getFrame(n - 1);
|
||||
} else {
|
||||
lastImage = null;
|
||||
}
|
||||
}
|
||||
|
||||
if (lastImage != null) {
|
||||
final int[] prev =
|
||||
((DataBufferInt) lastImage.getRaster().getDataBuffer()).getData();
|
||||
System.arraycopy(prev, 0, dest, 0, width * height);
|
||||
// copy pixels
|
||||
|
||||
if (lastDispose == 2) {
|
||||
// fill last image rect area with background color
|
||||
final Graphics2D g = image.createGraphics();
|
||||
final Color c;
|
||||
if (transparency) {
|
||||
c = new Color(0, 0, 0, 0); // assume background is transparent
|
||||
} else {
|
||||
c = new Color(lastBgColor); // use given background color
|
||||
}
|
||||
g.setColor(c);
|
||||
g.setComposite(AlphaComposite.Src); // replace area
|
||||
g.fill(lastRect);
|
||||
g.dispose();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// copy each source line to the appropriate place in the destination
|
||||
int pass = 1;
|
||||
int inc = 8;
|
||||
int iline = 0;
|
||||
for (int i = 0; i < ih; i++) {
|
||||
int line = i;
|
||||
if (interlace) {
|
||||
if (iline >= ih) {
|
||||
pass++;
|
||||
switch (pass) {
|
||||
case 2:
|
||||
iline = 4;
|
||||
break;
|
||||
case 3:
|
||||
iline = 2;
|
||||
inc = 4;
|
||||
break;
|
||||
case 4:
|
||||
iline = 1;
|
||||
inc = 2;
|
||||
}
|
||||
}
|
||||
line = iline;
|
||||
iline += inc;
|
||||
}
|
||||
line += iy;
|
||||
if (line < height) {
|
||||
final int k = line * width;
|
||||
int dx = k + ix; // start of line in dest
|
||||
int dlim = dx + iw; // end of dest line
|
||||
if ((k + width) < dlim) {
|
||||
dlim = k + width; // past dest edge
|
||||
}
|
||||
int sx = i * iw; // start of line in source
|
||||
while (dx < dlim) {
|
||||
// map color and insert in destination
|
||||
final int index = ((int) pixels[sx++]) & 0xff;
|
||||
final int c = act[index];
|
||||
if (c != 0) {
|
||||
dest[dx] = c;
|
||||
}
|
||||
dx++;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Gets the image contents of frame n.
|
||||
*
|
||||
* @param n frame
|
||||
* @return BufferedImage
|
||||
*/
|
||||
public BufferedImage getFrame(final int n) {
|
||||
BufferedImage im = null;
|
||||
if ((n >= 0) && (n < frameCount)) {
|
||||
im = frames.get(n).image;
|
||||
}
|
||||
return im;
|
||||
}
|
||||
|
||||
/**
|
||||
* Gets image size.
|
||||
*
|
||||
* @return GIF image dimensions
|
||||
*/
|
||||
public Dimension getFrameSize() {
|
||||
return new Dimension(width, height);
|
||||
}
|
||||
|
||||
/**
|
||||
* Reads GIF image from stream
|
||||
*
|
||||
* @param is BufferedInputStream containing GIF file.
|
||||
* @return read status code (0 = no errors)
|
||||
*/
|
||||
public int read(final BufferedInputStream is) {
|
||||
init();
|
||||
if (is != null) {
|
||||
in = is;
|
||||
readHeader();
|
||||
if (false == err()) {
|
||||
readContents();
|
||||
if (frameCount < 0) {
|
||||
status = STATUS_FORMAT_ERROR;
|
||||
}
|
||||
}
|
||||
} else {
|
||||
status = STATUS_OPEN_ERROR;
|
||||
}
|
||||
IoUtil.close(is);
|
||||
return status;
|
||||
}
|
||||
|
||||
/**
|
||||
* Reads GIF image from stream
|
||||
*
|
||||
* @param is InputStream containing GIF file.
|
||||
* @return read status code (0 = no errors)
|
||||
*/
|
||||
public int read(InputStream is) {
|
||||
init();
|
||||
if (is != null) {
|
||||
if (!(is instanceof BufferedInputStream))
|
||||
is = new BufferedInputStream(is);
|
||||
in = (BufferedInputStream) is;
|
||||
readHeader();
|
||||
if (!err()) {
|
||||
readContents();
|
||||
if (frameCount < 0) {
|
||||
status = STATUS_FORMAT_ERROR;
|
||||
}
|
||||
}
|
||||
} else {
|
||||
status = STATUS_OPEN_ERROR;
|
||||
}
|
||||
IoUtil.close(is);
|
||||
return status;
|
||||
}
|
||||
|
||||
/**
|
||||
* Reads GIF file from specified file/URL source
|
||||
* (URL assumed if name contains ":/" or "file:")
|
||||
*
|
||||
* @param name String containing source
|
||||
* @return read status code (0 = no errors)
|
||||
*/
|
||||
public int read(String name) {
|
||||
status = STATUS_OK;
|
||||
try {
|
||||
name = name.trim().toLowerCase();
|
||||
if ((name.contains("file:")) ||
|
||||
(name.indexOf(":/") > 0)) {
|
||||
final URL url = new URL(name);
|
||||
in = new BufferedInputStream(url.openStream());
|
||||
} else {
|
||||
in = new BufferedInputStream(Files.newInputStream(Paths.get(name)));
|
||||
}
|
||||
status = read(in);
|
||||
} catch (final IOException e) {
|
||||
status = STATUS_OPEN_ERROR;
|
||||
}
|
||||
|
||||
return status;
|
||||
}
|
||||
|
||||
/**
|
||||
* Decodes LZW image data into pixel array.
|
||||
* Adapted from John Cristy's ImageMagick.
|
||||
*/
|
||||
protected void decodeImageData() {
|
||||
final int NullCode = -1;
|
||||
final int npix = iw * ih;
|
||||
int available;
|
||||
final int clear;
|
||||
int code_mask;
|
||||
int code_size;
|
||||
final int end_of_information;
|
||||
int in_code;
|
||||
int old_code;
|
||||
int bits;
|
||||
int code;
|
||||
int count;
|
||||
int i;
|
||||
int datum;
|
||||
final int data_size;
|
||||
int first;
|
||||
int top;
|
||||
int bi;
|
||||
int pi;
|
||||
|
||||
if ((pixels == null) || (pixels.length < npix)) {
|
||||
pixels = new byte[npix]; // allocate new pixel array
|
||||
}
|
||||
if (prefix == null) prefix = new short[MAX_STACK_SIZE];
|
||||
if (suffix == null) suffix = new byte[MAX_STACK_SIZE];
|
||||
if (pixelStack == null) pixelStack = new byte[MAX_STACK_SIZE + 1];
|
||||
|
||||
// Initialize GIF data stream decoder.
|
||||
|
||||
data_size = read();
|
||||
clear = 1 << data_size;
|
||||
end_of_information = clear + 1;
|
||||
available = clear + 2;
|
||||
old_code = NullCode;
|
||||
code_size = data_size + 1;
|
||||
code_mask = (1 << code_size) - 1;
|
||||
for (code = 0; code < clear; code++) {
|
||||
prefix[code] = 0;
|
||||
suffix[code] = (byte) code;
|
||||
}
|
||||
|
||||
// Decode GIF pixel stream.
|
||||
|
||||
datum = bits = count = first = top = pi = bi = 0;
|
||||
|
||||
for (i = 0; i < npix; ) {
|
||||
if (top == 0) {
|
||||
if (bits < code_size) {
|
||||
// Load bytes until there are enough bits for a code.
|
||||
if (count == 0) {
|
||||
// Read a new data block.
|
||||
count = readBlock();
|
||||
if (count <= 0)
|
||||
break;
|
||||
bi = 0;
|
||||
}
|
||||
datum += (((int) block[bi]) & 0xff) << bits;
|
||||
bits += 8;
|
||||
bi++;
|
||||
count--;
|
||||
continue;
|
||||
}
|
||||
|
||||
// Get the next code.
|
||||
|
||||
code = datum & code_mask;
|
||||
datum >>= code_size;
|
||||
bits -= code_size;
|
||||
|
||||
// Interpret the code
|
||||
|
||||
if ((code > available) || (code == end_of_information))
|
||||
break;
|
||||
if (code == clear) {
|
||||
// Reset decoder.
|
||||
code_size = data_size + 1;
|
||||
code_mask = (1 << code_size) - 1;
|
||||
available = clear + 2;
|
||||
old_code = NullCode;
|
||||
continue;
|
||||
}
|
||||
if (old_code == NullCode) {
|
||||
pixelStack[top++] = suffix[code];
|
||||
old_code = code;
|
||||
first = code;
|
||||
continue;
|
||||
}
|
||||
in_code = code;
|
||||
if (code == available) {
|
||||
pixelStack[top++] = (byte) first;
|
||||
code = old_code;
|
||||
}
|
||||
while (code > clear) {
|
||||
pixelStack[top++] = suffix[code];
|
||||
code = prefix[code];
|
||||
}
|
||||
first = ((int) suffix[code]) & 0xff;
|
||||
|
||||
// Add a new string to the string table,
|
||||
|
||||
if (available >= MAX_STACK_SIZE) {
|
||||
pixelStack[top++] = (byte) first;
|
||||
continue;
|
||||
}
|
||||
pixelStack[top++] = (byte) first;
|
||||
prefix[available] = (short) old_code;
|
||||
suffix[available] = (byte) first;
|
||||
available++;
|
||||
if (((available & code_mask) == 0)
|
||||
&& (available < MAX_STACK_SIZE)) {
|
||||
code_size++;
|
||||
code_mask += available;
|
||||
}
|
||||
old_code = in_code;
|
||||
}
|
||||
|
||||
// Pop a pixel off the pixel stack.
|
||||
|
||||
top--;
|
||||
pixels[pi++] = pixelStack[top];
|
||||
i++;
|
||||
}
|
||||
|
||||
for (i = pi; i < npix; i++) {
|
||||
pixels[i] = 0; // clear missing pixels
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns true if an error was encountered during reading/decoding
|
||||
*
|
||||
* @return true if an error was encountered during reading/decoding
|
||||
*/
|
||||
protected boolean err() {
|
||||
return status != STATUS_OK;
|
||||
}
|
||||
|
||||
/**
|
||||
* Initializes or re-initializes reader
|
||||
*/
|
||||
protected void init() {
|
||||
status = STATUS_OK;
|
||||
frameCount = 0;
|
||||
frames = new ArrayList<>();
|
||||
gct = null;
|
||||
lct = null;
|
||||
}
|
||||
|
||||
/**
|
||||
* Reads a single byte from the input stream.
|
||||
*
|
||||
* @return single byte
|
||||
*/
|
||||
protected int read() {
|
||||
int curByte = 0;
|
||||
try {
|
||||
curByte = in.read();
|
||||
} catch (final IOException e) {
|
||||
status = STATUS_FORMAT_ERROR;
|
||||
}
|
||||
return curByte;
|
||||
}
|
||||
|
||||
/**
|
||||
* Reads next variable length block from input.
|
||||
*
|
||||
* @return number of bytes stored in "buffer"
|
||||
*/
|
||||
protected int readBlock() {
|
||||
blockSize = read();
|
||||
int n = 0;
|
||||
if (blockSize > 0) {
|
||||
try {
|
||||
int count;
|
||||
while (n < blockSize) {
|
||||
count = in.read(block, n, blockSize - n);
|
||||
if (count == -1)
|
||||
break;
|
||||
n += count;
|
||||
}
|
||||
} catch (final IOException e) {
|
||||
//ignore
|
||||
}
|
||||
|
||||
if (n < blockSize) {
|
||||
status = STATUS_FORMAT_ERROR;
|
||||
}
|
||||
}
|
||||
return n;
|
||||
}
|
||||
|
||||
/**
|
||||
* Reads color table as 256 RGB integer values
|
||||
*
|
||||
* @param ncolors int number of colors to read
|
||||
* @return int array containing 256 colors (packed ARGB with full alpha)
|
||||
*/
|
||||
protected int[] readColorTable(final int ncolors) {
|
||||
final int nbytes = 3 * ncolors;
|
||||
int[] tab = null;
|
||||
final byte[] c = new byte[nbytes];
|
||||
int n = 0;
|
||||
try {
|
||||
n = in.read(c);
|
||||
} catch (final IOException e) {
|
||||
//ignore
|
||||
}
|
||||
if (n < nbytes) {
|
||||
status = STATUS_FORMAT_ERROR;
|
||||
} else {
|
||||
tab = new int[256]; // max size to avoid bounds checks
|
||||
int i = 0;
|
||||
int j = 0;
|
||||
while (i < ncolors) {
|
||||
final int r = ((int) c[j++]) & 0xff;
|
||||
final int g = ((int) c[j++]) & 0xff;
|
||||
final int b = ((int) c[j++]) & 0xff;
|
||||
tab[i++] = 0xff000000 | (r << 16) | (g << 8) | b;
|
||||
}
|
||||
}
|
||||
return tab;
|
||||
}
|
||||
|
||||
/**
|
||||
* Main file parser. Reads GIF content blocks.
|
||||
*/
|
||||
protected void readContents() {
|
||||
// read GIF file content blocks
|
||||
boolean done = false;
|
||||
while (!(done || err())) {
|
||||
int code = read();
|
||||
switch (code) {
|
||||
|
||||
case 0x2C: // image separator
|
||||
readImage();
|
||||
break;
|
||||
|
||||
case 0x21: // extension
|
||||
code = read();
|
||||
switch (code) {
|
||||
case 0xf9: // graphics control extension
|
||||
readGraphicControlExt();
|
||||
break;
|
||||
|
||||
case 0xff: // application extension
|
||||
readBlock();
|
||||
final StringBuilder app = new StringBuilder();
|
||||
for (int i = 0; i < 11; i++) {
|
||||
app.append((char) block[i]);
|
||||
}
|
||||
if ("NETSCAPE2.0".equals(app.toString())) {
|
||||
readNetscapeExt();
|
||||
} else {
|
||||
skip(); // don't care
|
||||
}
|
||||
break;
|
||||
|
||||
default: // uninteresting extension
|
||||
skip();
|
||||
}
|
||||
break;
|
||||
|
||||
case 0x3b: // terminator
|
||||
done = true;
|
||||
break;
|
||||
|
||||
case 0x00: // bad byte, but keep going and see what happens
|
||||
break;
|
||||
|
||||
default:
|
||||
status = STATUS_FORMAT_ERROR;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Reads Graphics Control Extension values
|
||||
*/
|
||||
protected void readGraphicControlExt() {
|
||||
read(); // block size
|
||||
final int packed = read(); // packed fields
|
||||
dispose = (packed & 0x1c) >> 2; // disposal method
|
||||
if (dispose == 0) {
|
||||
dispose = 1; // elect to keep old image if discretionary
|
||||
}
|
||||
transparency = (packed & 1) != 0;
|
||||
delay = readShort() * 10; // delay in milliseconds
|
||||
transIndex = read(); // transparent color index
|
||||
read(); // block terminator
|
||||
}
|
||||
|
||||
/**
|
||||
* Reads GIF file header information.
|
||||
*/
|
||||
protected void readHeader() {
|
||||
final StringBuilder id = new StringBuilder();
|
||||
for (int i = 0; i < 6; i++) {
|
||||
id.append((char) read());
|
||||
}
|
||||
if (false == id.toString().startsWith("GIF")) {
|
||||
status = STATUS_FORMAT_ERROR;
|
||||
return;
|
||||
}
|
||||
|
||||
readLSD();
|
||||
if (gctFlag && !err()) {
|
||||
gct = readColorTable(gctSize);
|
||||
bgColor = gct[bgIndex];
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Reads next frame image
|
||||
*/
|
||||
protected void readImage() {
|
||||
ix = readShort(); // (sub)image position & size
|
||||
iy = readShort();
|
||||
iw = readShort();
|
||||
ih = readShort();
|
||||
|
||||
final int packed = read();
|
||||
lctFlag = (packed & 0x80) != 0; // 1 - local color table flag
|
||||
interlace = (packed & 0x40) != 0; // 2 - interlace flag
|
||||
// 3 - sort flag
|
||||
// 4-5 - reserved
|
||||
lctSize = 2 << (packed & 7); // 6-8 - local color table size
|
||||
|
||||
if (lctFlag) {
|
||||
lct = readColorTable(lctSize); // read table
|
||||
act = lct; // make local table active
|
||||
} else {
|
||||
act = gct; // make global table active
|
||||
if (bgIndex == transIndex)
|
||||
bgColor = 0;
|
||||
}
|
||||
int save = 0;
|
||||
if (transparency) {
|
||||
save = act[transIndex];
|
||||
act[transIndex] = 0; // set transparent color if specified
|
||||
}
|
||||
|
||||
if (act == null) {
|
||||
status = STATUS_FORMAT_ERROR; // no color table defined
|
||||
}
|
||||
|
||||
if (err()) return;
|
||||
|
||||
decodeImageData(); // decode pixel data
|
||||
skip();
|
||||
|
||||
if (err()) return;
|
||||
|
||||
frameCount++;
|
||||
|
||||
// create new image to receive frame data
|
||||
image =
|
||||
new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB_PRE);
|
||||
|
||||
setPixels(); // transfer pixel data to image
|
||||
|
||||
frames.add(new GifFrame(image, delay)); // add image to frame list
|
||||
|
||||
if (transparency) {
|
||||
act[transIndex] = save;
|
||||
}
|
||||
resetFrame();
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* Reads Logical Screen Descriptor
|
||||
*/
|
||||
protected void readLSD() {
|
||||
|
||||
// logical screen size
|
||||
width = readShort();
|
||||
height = readShort();
|
||||
|
||||
// packed fields
|
||||
final int packed = read();
|
||||
gctFlag = (packed & 0x80) != 0; // 1 : global color table flag
|
||||
// 2-4 : color resolution
|
||||
// 5 : gct sort flag
|
||||
gctSize = 2 << (packed & 7); // 6-8 : gct size
|
||||
|
||||
bgIndex = read(); // background color index
|
||||
pixelAspect = read(); // pixel aspect ratio
|
||||
}
|
||||
|
||||
/**
|
||||
* Reads Netscape extenstion to obtain iteration count
|
||||
*/
|
||||
protected void readNetscapeExt() {
|
||||
do {
|
||||
readBlock();
|
||||
if (block[0] == 1) {
|
||||
// loop count sub-block
|
||||
final int b1 = ((int) block[1]) & 0xff;
|
||||
final int b2 = ((int) block[2]) & 0xff;
|
||||
loopCount = (b2 << 8) | b1;
|
||||
}
|
||||
} while ((blockSize > 0) && !err());
|
||||
}
|
||||
|
||||
/**
|
||||
* Reads next 16-bit value, LSB first
|
||||
*
|
||||
* @return next 16-bit value
|
||||
*/
|
||||
protected int readShort() {
|
||||
// read 16-bit value, LSB first
|
||||
return read() | (read() << 8);
|
||||
}
|
||||
|
||||
/**
|
||||
* Resets frame state for reading next image.
|
||||
*/
|
||||
protected void resetFrame() {
|
||||
lastDispose = dispose;
|
||||
lastRect = new Rectangle(ix, iy, iw, ih);
|
||||
lastImage = image;
|
||||
lastBgColor = bgColor;
|
||||
lct = null;
|
||||
}
|
||||
|
||||
/**
|
||||
* Skips variable length blocks up to and including
|
||||
* next zero length block.
|
||||
*/
|
||||
protected void skip() {
|
||||
do {
|
||||
readBlock();
|
||||
} while ((blockSize > 0) && !err());
|
||||
}
|
||||
}
|
||||
@ -1,306 +0,0 @@
|
||||
package cn.hutool.swing.img.gif;
|
||||
|
||||
import java.io.IOException;
|
||||
import java.io.OutputStream;
|
||||
|
||||
//==============================================================================
|
||||
// Adapted from Jef Poskanzer's Java port by way of J. M. G. Elliott.
|
||||
// K Weiner 12/00
|
||||
|
||||
class LZWEncoder {
|
||||
|
||||
private static final int EOF = -1;
|
||||
|
||||
private final int imgW;
|
||||
private final int imgH;
|
||||
private final byte[] pixAry;
|
||||
private final int initCodeSize;
|
||||
|
||||
private int remaining;
|
||||
private int curPixel;
|
||||
|
||||
// GIFCOMPR.C - GIF Image compression routines
|
||||
//
|
||||
// Lempel-Ziv compression based on 'compress'. GIF modifications by
|
||||
// David Rowley (mgardi@watdcsu.waterloo.edu)
|
||||
|
||||
// General DEFINEs
|
||||
|
||||
static final int BITS = 12;
|
||||
|
||||
static final int HSIZE = 5003; // 80% occupancy
|
||||
|
||||
// GIF Image compression - modified 'compress'
|
||||
//
|
||||
// Based on: compress.c - File compression ala IEEE Computer, June 1984.
|
||||
//
|
||||
// By Authors: Spencer W. Thomas (decvax!harpo!utah-cs!utah-gr!thomas)
|
||||
// Jim McKie (decvax!mcvax!jim)
|
||||
// Steve Davies (decvax!vax135!petsd!peora!srd)
|
||||
// Ken Turkowski (decvax!decwrl!turtlevax!ken)
|
||||
// James A. Woods (decvax!ihnp4!ames!jaw)
|
||||
// Joe Orost (decvax!vax135!petsd!joe)
|
||||
|
||||
int n_bits; // number of bits/code
|
||||
int maxbits = BITS; // user settable max # bits/code
|
||||
int maxcode; // maximum code, given n_bits
|
||||
int maxmaxcode = 1 << BITS; // should NEVER generate this code
|
||||
|
||||
int[] htab = new int[HSIZE];
|
||||
int[] codetab = new int[HSIZE];
|
||||
|
||||
int hsize = HSIZE; // for dynamic table sizing
|
||||
|
||||
int free_ent = 0; // first unused entry
|
||||
|
||||
// block compression parameters -- after all codes are used up,
|
||||
// and compression rate changes, start over.
|
||||
boolean clear_flg = false;
|
||||
|
||||
// Algorithm: use open addressing double hashing (no chaining) on the
|
||||
// prefix code / next character combination. We do a variant of Knuth's
|
||||
// algorithm D (vol. 3, sec. 6.4) along with G. Knott's relatively-prime
|
||||
// secondary probe. Here, the modular division first probe is gives way
|
||||
// to a faster exclusive-or manipulation. Also do block compression with
|
||||
// an adaptive reset, whereby the code table is cleared when the compression
|
||||
// ratio decreases, but after the table fills. The variable-length output
|
||||
// codes are re-sized at this point, and a special CLEAR code is generated
|
||||
// for the decompressor. Late addition: construct the table according to
|
||||
// file size for noticeable speed improvement on small files. Please direct
|
||||
// questions about this implementation to ames!jaw.
|
||||
|
||||
int g_init_bits;
|
||||
|
||||
int ClearCode;
|
||||
int EOFCode;
|
||||
|
||||
// output
|
||||
//
|
||||
// Output the given code.
|
||||
// Inputs:
|
||||
// code: A n_bits-bit integer. If == -1, then EOF. This assumes
|
||||
// that n_bits =< wordsize - 1.
|
||||
// Outputs:
|
||||
// Outputs code to the file.
|
||||
// Assumptions:
|
||||
// Chars are 8 bits long.
|
||||
// Algorithm:
|
||||
// Maintain a BITS character long buffer (so that 8 codes will
|
||||
// fit in it exactly). Use the VAX insv instruction to insert each
|
||||
// code in turn. When the buffer fills up empty it and start over.
|
||||
|
||||
int cur_accum = 0;
|
||||
int cur_bits = 0;
|
||||
|
||||
final int[] masks =
|
||||
{
|
||||
0x0000,
|
||||
0x0001,
|
||||
0x0003,
|
||||
0x0007,
|
||||
0x000F,
|
||||
0x001F,
|
||||
0x003F,
|
||||
0x007F,
|
||||
0x00FF,
|
||||
0x01FF,
|
||||
0x03FF,
|
||||
0x07FF,
|
||||
0x0FFF,
|
||||
0x1FFF,
|
||||
0x3FFF,
|
||||
0x7FFF,
|
||||
0xFFFF };
|
||||
|
||||
// Number of characters so far in this 'packet'
|
||||
int a_count;
|
||||
|
||||
// Define the storage for the packet accumulator
|
||||
byte[] accum = new byte[256];
|
||||
|
||||
//----------------------------------------------------------------------------
|
||||
LZWEncoder(final int width, final int height, final byte[] pixels, final int color_depth) {
|
||||
imgW = width;
|
||||
imgH = height;
|
||||
pixAry = pixels;
|
||||
initCodeSize = Math.max(2, color_depth);
|
||||
}
|
||||
|
||||
// Add a character to the end of the current packet, and if it is 254
|
||||
// characters, flush the packet to disk.
|
||||
void char_out(final byte c, final OutputStream outs) throws IOException {
|
||||
accum[a_count++] = c;
|
||||
if (a_count >= 254)
|
||||
flush_char(outs);
|
||||
}
|
||||
|
||||
// Clear out the hash table
|
||||
|
||||
// table clear for block compress
|
||||
void cl_block(final OutputStream outs) throws IOException {
|
||||
cl_hash(hsize);
|
||||
free_ent = ClearCode + 2;
|
||||
clear_flg = true;
|
||||
|
||||
output(ClearCode, outs);
|
||||
}
|
||||
|
||||
// reset code table
|
||||
void cl_hash(final int hsize) {
|
||||
for (int i = 0; i < hsize; ++i)
|
||||
htab[i] = -1;
|
||||
}
|
||||
|
||||
void compress(final int init_bits, final OutputStream outs) throws IOException {
|
||||
int fcode;
|
||||
int i /* = 0 */;
|
||||
int c;
|
||||
int ent;
|
||||
int disp;
|
||||
final int hsize_reg;
|
||||
int hshift;
|
||||
|
||||
// Set up the globals: g_init_bits - initial number of bits
|
||||
g_init_bits = init_bits;
|
||||
|
||||
// Set up the necessary values
|
||||
clear_flg = false;
|
||||
n_bits = g_init_bits;
|
||||
maxcode = MAXCODE(n_bits);
|
||||
|
||||
ClearCode = 1 << (init_bits - 1);
|
||||
EOFCode = ClearCode + 1;
|
||||
free_ent = ClearCode + 2;
|
||||
|
||||
a_count = 0; // clear packet
|
||||
|
||||
ent = nextPixel();
|
||||
|
||||
hshift = 0;
|
||||
for (fcode = hsize; fcode < 65536; fcode *= 2)
|
||||
++hshift;
|
||||
hshift = 8 - hshift; // set hash code range bound
|
||||
|
||||
hsize_reg = hsize;
|
||||
cl_hash(hsize_reg); // clear hash table
|
||||
|
||||
output(ClearCode, outs);
|
||||
|
||||
outer_loop : while ((c = nextPixel()) != EOF) {
|
||||
fcode = (c << maxbits) + ent;
|
||||
i = (c << hshift) ^ ent; // xor hashing
|
||||
|
||||
if (htab[i] == fcode) {
|
||||
ent = codetab[i];
|
||||
continue;
|
||||
} else if (htab[i] >= 0) // non-empty slot
|
||||
{
|
||||
disp = hsize_reg - i; // secondary hash (after G. Knott)
|
||||
if (i == 0)
|
||||
disp = 1;
|
||||
do {
|
||||
if ((i -= disp) < 0)
|
||||
i += hsize_reg;
|
||||
|
||||
if (htab[i] == fcode) {
|
||||
ent = codetab[i];
|
||||
continue outer_loop;
|
||||
}
|
||||
} while (htab[i] >= 0);
|
||||
}
|
||||
output(ent, outs);
|
||||
ent = c;
|
||||
if (free_ent < maxmaxcode) {
|
||||
codetab[i] = free_ent++; // code -> hashtable
|
||||
htab[i] = fcode;
|
||||
} else {
|
||||
cl_block(outs);
|
||||
}
|
||||
}
|
||||
// Put out the final code.
|
||||
output(ent, outs);
|
||||
output(EOFCode, outs);
|
||||
}
|
||||
|
||||
//----------------------------------------------------------------------------
|
||||
void encode(final OutputStream os) throws IOException {
|
||||
os.write(initCodeSize); // write "initial code size" byte
|
||||
|
||||
remaining = imgW * imgH; // reset navigation variables
|
||||
curPixel = 0;
|
||||
|
||||
compress(initCodeSize + 1, os); // compress and write the pixel data
|
||||
|
||||
os.write(0); // write block terminator
|
||||
}
|
||||
|
||||
// Flush the packet to disk, and reset the accumulator
|
||||
void flush_char(final OutputStream outs) throws IOException {
|
||||
if (a_count > 0) {
|
||||
outs.write(a_count);
|
||||
outs.write(accum, 0, a_count);
|
||||
a_count = 0;
|
||||
}
|
||||
}
|
||||
|
||||
final int MAXCODE(final int n_bits) {
|
||||
return (1 << n_bits) - 1;
|
||||
}
|
||||
|
||||
//----------------------------------------------------------------------------
|
||||
// Return the next pixel from the image
|
||||
//----------------------------------------------------------------------------
|
||||
private int nextPixel() {
|
||||
if (remaining == 0)
|
||||
return EOF;
|
||||
|
||||
--remaining;
|
||||
|
||||
final byte pix = pixAry[curPixel++];
|
||||
|
||||
return pix & 0xff;
|
||||
}
|
||||
|
||||
void output(final int code, final OutputStream outs) throws IOException {
|
||||
cur_accum &= masks[cur_bits];
|
||||
|
||||
if (cur_bits > 0)
|
||||
cur_accum |= (code << cur_bits);
|
||||
else
|
||||
cur_accum = code;
|
||||
|
||||
cur_bits += n_bits;
|
||||
|
||||
while (cur_bits >= 8) {
|
||||
char_out((byte) (cur_accum & 0xff), outs);
|
||||
cur_accum >>= 8;
|
||||
cur_bits -= 8;
|
||||
}
|
||||
|
||||
// If the next entry is going to be too big for the code size,
|
||||
// then increase it, if possible.
|
||||
if (free_ent > maxcode || clear_flg) {
|
||||
if (clear_flg) {
|
||||
maxcode = MAXCODE(n_bits = g_init_bits);
|
||||
clear_flg = false;
|
||||
} else {
|
||||
++n_bits;
|
||||
if (n_bits == maxbits)
|
||||
maxcode = maxmaxcode;
|
||||
else
|
||||
maxcode = MAXCODE(n_bits);
|
||||
}
|
||||
}
|
||||
|
||||
if (code == EOFCode) {
|
||||
// At EOF, write the rest of the buffer.
|
||||
while (cur_bits > 0) {
|
||||
char_out((byte) (cur_accum & 0xff), outs);
|
||||
cur_accum >>= 8;
|
||||
cur_bits -= 8;
|
||||
}
|
||||
|
||||
flush_char(outs);
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -1,444 +0,0 @@
|
||||
package cn.hutool.swing.img.gif;
|
||||
|
||||
/**
|
||||
* NeuQuant Neural-Net Quantization Algorithm
|
||||
*
|
||||
* @author Dekker
|
||||
*/
|
||||
public class NeuQuant {
|
||||
|
||||
protected static final int NETSIZE = 256; /* number of colours used */
|
||||
|
||||
/* four primes near 500 - assume no image has a length so large */
|
||||
/* that it is divisible by all four primes */
|
||||
protected static final int PRIME1 = 499;
|
||||
protected static final int PRIME2 = 491;
|
||||
protected static final int PRIME3 = 487;
|
||||
protected static final int PRIME4 = 503;
|
||||
|
||||
protected static final int MINPICTUREBYTES = (3 * PRIME4);
|
||||
/* minimum size for input image */
|
||||
|
||||
/* Program Skeleton
|
||||
----------------
|
||||
[select samplefac in range 1..30]
|
||||
[read image from input file]
|
||||
pic = (unsigned char*) malloc(3*width*height);
|
||||
initnet(pic,3*width*height,samplefac);
|
||||
learn();
|
||||
unbiasnet();
|
||||
[write output image header, using writecolourmap(f)]
|
||||
inxbuild();
|
||||
write output image using inxsearch(b,g,r) */
|
||||
|
||||
/* Network Definitions
|
||||
------------------- */
|
||||
|
||||
protected static final int MAXNETPOS = (NETSIZE - 1);
|
||||
protected static final int NETBIASSHIFT = 4; /* bias for colour values */
|
||||
protected static final int NCYCLES = 100; /* no. of learning cycles */
|
||||
|
||||
/* defs for freq and bias */
|
||||
protected static final int INTBIASSHIFT = 16; /* bias for fractions */
|
||||
protected static final int INTBIAS = (1 << INTBIASSHIFT);
|
||||
protected static final int GAMMASHIFT = 10; /* gamma = 1024 */
|
||||
protected static final int GAMMA = (1 << GAMMASHIFT);
|
||||
protected static final int BETASHIFT = 10;
|
||||
protected static final int BETA = (INTBIAS >> BETASHIFT); /* beta = 1/1024 */
|
||||
protected static final int BETAGAMMA =
|
||||
(INTBIAS << (GAMMASHIFT - BETASHIFT));
|
||||
|
||||
/* defs for decreasing radius factor */
|
||||
protected static final int INITRAD = (NETSIZE >> 3); /* for 256 cols, radius starts */
|
||||
protected static final int RADIUSBIASSHIFT = 6; /* at 32.0 biased by 6 bits */
|
||||
protected static final int RADIUSBIAS = (1 << RADIUSBIASSHIFT);
|
||||
protected static final int INITRADIUS = (INITRAD * RADIUSBIAS); /* and decreases by a */
|
||||
protected static final int RADIUSDEC = 30; /* factor of 1/30 each cycle */
|
||||
|
||||
/* defs for decreasing alpha factor */
|
||||
protected static final int ALPHABIASSHIFT = 10; /* alpha starts at 1.0 */
|
||||
protected static final int INITALPHA = (1 << ALPHABIASSHIFT);
|
||||
|
||||
protected int alphadec; /* biased by 10 bits */
|
||||
|
||||
/* radbias and alpharadbias used for radpower calculation */
|
||||
protected static final int RADBIASSHIFT = 8;
|
||||
protected static final int RADBIAS = (1 << RADBIASSHIFT);
|
||||
protected static final int ALPHARADBSHIFT = (ALPHABIASSHIFT + RADBIASSHIFT);
|
||||
protected static final int ALPHARADBIAS = (1 << ALPHARADBSHIFT);
|
||||
|
||||
/* Types and Global Variables
|
||||
-------------------------- */
|
||||
|
||||
protected byte[] thepicture; /* the input image itself */
|
||||
protected int lengthcount; /* lengthcount = H*W*3 */
|
||||
|
||||
protected int samplefac; /* sampling factor 1..30 */
|
||||
|
||||
// typedef int pixel[4]; /* BGRc */
|
||||
protected int[][] network; /* the network itself - [netsize][4] */
|
||||
|
||||
protected int[] netindex = new int[256];
|
||||
/* for network lookup - really 256 */
|
||||
|
||||
protected int[] bias = new int[NETSIZE];
|
||||
/* bias and freq arrays for learning */
|
||||
protected int[] freq = new int[NETSIZE];
|
||||
protected int[] radpower = new int[INITRAD];
|
||||
/* radpower for precomputation */
|
||||
|
||||
/* Initialise network in range (0,0,0) to (255,255,255) and set parameters
|
||||
----------------------------------------------------------------------- */
|
||||
public NeuQuant(final byte[] thepic, final int len, final int sample) {
|
||||
|
||||
int i;
|
||||
int[] p;
|
||||
|
||||
thepicture = thepic;
|
||||
lengthcount = len;
|
||||
samplefac = sample;
|
||||
|
||||
network = new int[NETSIZE][];
|
||||
for (i = 0; i < NETSIZE; i++) {
|
||||
network[i] = new int[4];
|
||||
p = network[i];
|
||||
p[0] = p[1] = p[2] = (i << (NETBIASSHIFT + 8)) / NETSIZE;
|
||||
freq[i] = INTBIAS / NETSIZE; /* 1/netsize */
|
||||
bias[i] = 0;
|
||||
}
|
||||
}
|
||||
|
||||
public byte[] colorMap() {
|
||||
final byte[] map = new byte[3 * NETSIZE];
|
||||
final int[] index = new int[NETSIZE];
|
||||
for (int i = 0; i < NETSIZE; i++)
|
||||
index[network[i][3]] = i;
|
||||
int k = 0;
|
||||
for (int i = 0; i < NETSIZE; i++) {
|
||||
final int j = index[i];
|
||||
map[k++] = (byte) (network[j][0]);
|
||||
map[k++] = (byte) (network[j][1]);
|
||||
map[k++] = (byte) (network[j][2]);
|
||||
}
|
||||
return map;
|
||||
}
|
||||
|
||||
/* Insertion sort of network and building of netindex[0..255] (to do after unbias)
|
||||
------------------------------------------------------------------------------- */
|
||||
public void inxbuild() {
|
||||
|
||||
int i, j, smallpos, smallval;
|
||||
int[] p;
|
||||
int[] q;
|
||||
int previouscol, startpos;
|
||||
|
||||
previouscol = 0;
|
||||
startpos = 0;
|
||||
for (i = 0; i < NETSIZE; i++) {
|
||||
p = network[i];
|
||||
smallpos = i;
|
||||
smallval = p[1]; /* index on g */
|
||||
/* find smallest in i..netsize-1 */
|
||||
for (j = i + 1; j < NETSIZE; j++) {
|
||||
q = network[j];
|
||||
if (q[1] < smallval) { /* index on g */
|
||||
smallpos = j;
|
||||
smallval = q[1]; /* index on g */
|
||||
}
|
||||
}
|
||||
q = network[smallpos];
|
||||
/* swap p (i) and q (smallpos) entries */
|
||||
if (i != smallpos) {
|
||||
j = q[0];
|
||||
q[0] = p[0];
|
||||
p[0] = j;
|
||||
j = q[1];
|
||||
q[1] = p[1];
|
||||
p[1] = j;
|
||||
j = q[2];
|
||||
q[2] = p[2];
|
||||
p[2] = j;
|
||||
j = q[3];
|
||||
q[3] = p[3];
|
||||
p[3] = j;
|
||||
}
|
||||
/* smallval entry is now in position i */
|
||||
if (smallval != previouscol) {
|
||||
netindex[previouscol] = (startpos + i) >> 1;
|
||||
for (j = previouscol + 1; j < smallval; j++)
|
||||
netindex[j] = i;
|
||||
previouscol = smallval;
|
||||
startpos = i;
|
||||
}
|
||||
}
|
||||
netindex[previouscol] = (startpos + MAXNETPOS) >> 1;
|
||||
for (j = previouscol + 1; j < 256; j++)
|
||||
netindex[j] = MAXNETPOS; /* really 256 */
|
||||
}
|
||||
|
||||
/* Main Learning Loop
|
||||
------------------ */
|
||||
public void learn() {
|
||||
|
||||
int i, j, b, g, r;
|
||||
int radius;
|
||||
int rad;
|
||||
int alpha;
|
||||
final int step;
|
||||
int delta;
|
||||
final int samplepixels;
|
||||
final byte[] p;
|
||||
int pix;
|
||||
final int lim;
|
||||
|
||||
if (lengthcount < MINPICTUREBYTES)
|
||||
samplefac = 1;
|
||||
alphadec = 30 + ((samplefac - 1) / 3);
|
||||
p = thepicture;
|
||||
pix = 0;
|
||||
lim = lengthcount;
|
||||
samplepixels = lengthcount / (3 * samplefac);
|
||||
delta = samplepixels / NCYCLES;
|
||||
alpha = INITALPHA;
|
||||
radius = INITRADIUS;
|
||||
|
||||
rad = radius >> RADIUSBIASSHIFT;
|
||||
for (i = 0; i < rad; i++)
|
||||
radpower[i] =
|
||||
alpha * (((rad * rad - i * i) * RADBIAS) / (rad * rad));
|
||||
|
||||
//fprintf(stderr,"beginning 1D learning: initial radius=%d\n", rad);
|
||||
|
||||
if (lengthcount < MINPICTUREBYTES)
|
||||
step = 3;
|
||||
else if ((lengthcount % PRIME1) != 0)
|
||||
step = 3 * PRIME1;
|
||||
else {
|
||||
if ((lengthcount % PRIME2) != 0)
|
||||
step = 3 * PRIME2;
|
||||
else {
|
||||
if ((lengthcount % PRIME3) != 0)
|
||||
step = 3 * PRIME3;
|
||||
else
|
||||
step = 3 * PRIME4;
|
||||
}
|
||||
}
|
||||
|
||||
i = 0;
|
||||
while (i < samplepixels) {
|
||||
b = (p[pix] & 0xff) << NETBIASSHIFT;
|
||||
g = (p[pix + 1] & 0xff) << NETBIASSHIFT;
|
||||
r = (p[pix + 2] & 0xff) << NETBIASSHIFT;
|
||||
j = contest(b, g, r);
|
||||
|
||||
altersingle(alpha, j, b, g, r);
|
||||
if (rad != 0)
|
||||
alterneigh(rad, j, b, g, r); /* alter neighbours */
|
||||
|
||||
pix += step;
|
||||
if (pix >= lim)
|
||||
pix -= lengthcount;
|
||||
|
||||
i++;
|
||||
if (delta == 0)
|
||||
delta = 1;
|
||||
if (i % delta == 0) {
|
||||
alpha -= alpha / alphadec;
|
||||
radius -= radius / RADIUSDEC;
|
||||
rad = radius >> RADIUSBIASSHIFT;
|
||||
if (rad <= 1)
|
||||
rad = 0;
|
||||
for (j = 0; j < rad; j++)
|
||||
radpower[j] =
|
||||
alpha * (((rad * rad - j * j) * RADBIAS) / (rad * rad));
|
||||
}
|
||||
}
|
||||
//fprintf(stderr,"finished 1D learning: final alpha=%f !\n",((float)alpha)/initalpha);
|
||||
}
|
||||
|
||||
/* Search for BGR values 0..255 (after net is unbiased) and return colour index
|
||||
---------------------------------------------------------------------------- */
|
||||
public int map(final int b, final int g, final int r) {
|
||||
|
||||
int i, j, dist, a, bestd;
|
||||
int[] p;
|
||||
int best;
|
||||
|
||||
bestd = 1000; /* biggest possible dist is 256*3 */
|
||||
best = -1;
|
||||
i = netindex[g]; /* index on g */
|
||||
j = i - 1; /* start at netindex[g] and work outwards */
|
||||
|
||||
while ((i < NETSIZE) || (j >= 0)) {
|
||||
if (i < NETSIZE) {
|
||||
p = network[i];
|
||||
dist = p[1] - g; /* inx key */
|
||||
if (dist >= bestd)
|
||||
i = NETSIZE; /* stop iter */
|
||||
else {
|
||||
i++;
|
||||
if (dist < 0)
|
||||
dist = -dist;
|
||||
a = p[0] - b;
|
||||
if (a < 0)
|
||||
a = -a;
|
||||
dist += a;
|
||||
if (dist < bestd) {
|
||||
a = p[2] - r;
|
||||
if (a < 0)
|
||||
a = -a;
|
||||
dist += a;
|
||||
if (dist < bestd) {
|
||||
bestd = dist;
|
||||
best = p[3];
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
if (j >= 0) {
|
||||
p = network[j];
|
||||
dist = g - p[1]; /* inx key - reverse dif */
|
||||
if (dist >= bestd)
|
||||
j = -1; /* stop iter */
|
||||
else {
|
||||
j--;
|
||||
if (dist < 0)
|
||||
dist = -dist;
|
||||
a = p[0] - b;
|
||||
if (a < 0)
|
||||
a = -a;
|
||||
dist += a;
|
||||
if (dist < bestd) {
|
||||
a = p[2] - r;
|
||||
if (a < 0)
|
||||
a = -a;
|
||||
dist += a;
|
||||
if (dist < bestd) {
|
||||
bestd = dist;
|
||||
best = p[3];
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
return (best);
|
||||
}
|
||||
|
||||
public byte[] process() {
|
||||
learn();
|
||||
unbiasnet();
|
||||
inxbuild();
|
||||
return colorMap();
|
||||
}
|
||||
|
||||
/* Unbias network to give byte values 0..255 and record position i to prepare for sort
|
||||
----------------------------------------------------------------------------------- */
|
||||
public void unbiasnet() {
|
||||
for (int i = 0; i < NETSIZE; i++) {
|
||||
network[i][0] >>= NETBIASSHIFT;
|
||||
network[i][1] >>= NETBIASSHIFT;
|
||||
network[i][2] >>= NETBIASSHIFT;
|
||||
network[i][3] = i; /* record colour no */
|
||||
}
|
||||
}
|
||||
|
||||
/* Move adjacent neurons by precomputed alpha*(1-((i-j)^2/[r]^2)) in radpower[|i-j|]
|
||||
--------------------------------------------------------------------------------- */
|
||||
protected void alterneigh(final int rad, final int i, final int b, final int g, final int r) {
|
||||
|
||||
int j, k, lo, hi, a, m;
|
||||
int[] p;
|
||||
|
||||
lo = i - rad;
|
||||
if (lo < -1)
|
||||
lo = -1;
|
||||
hi = i + rad;
|
||||
if (hi > NETSIZE)
|
||||
hi = NETSIZE;
|
||||
|
||||
j = i + 1;
|
||||
k = i - 1;
|
||||
m = 1;
|
||||
while ((j < hi) || (k > lo)) {
|
||||
a = radpower[m++];
|
||||
if (j < hi) {
|
||||
p = network[j++];
|
||||
try {
|
||||
p[0] -= (a * (p[0] - b)) / ALPHARADBIAS;
|
||||
p[1] -= (a * (p[1] - g)) / ALPHARADBIAS;
|
||||
p[2] -= (a * (p[2] - r)) / ALPHARADBIAS;
|
||||
} catch (final Exception ignored) {
|
||||
} // prevents 1.3 miscompilation
|
||||
}
|
||||
if (k > lo) {
|
||||
p = network[k--];
|
||||
try {
|
||||
p[0] -= (a * (p[0] - b)) / ALPHARADBIAS;
|
||||
p[1] -= (a * (p[1] - g)) / ALPHARADBIAS;
|
||||
p[2] -= (a * (p[2] - r)) / ALPHARADBIAS;
|
||||
} catch (final Exception ignored) {
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* Move neuron i towards biased (b,g,r) by factor alpha
|
||||
---------------------------------------------------- */
|
||||
protected void altersingle(final int alpha, final int i, final int b, final int g, final int r) {
|
||||
|
||||
/* alter hit neuron */
|
||||
final int[] n = network[i];
|
||||
n[0] -= (alpha * (n[0] - b)) / INITALPHA;
|
||||
n[1] -= (alpha * (n[1] - g)) / INITALPHA;
|
||||
n[2] -= (alpha * (n[2] - r)) / INITALPHA;
|
||||
}
|
||||
|
||||
/* Search for biased BGR values
|
||||
---------------------------- */
|
||||
protected int contest(final int b, final int g, final int r) {
|
||||
|
||||
/* finds closest neuron (min dist) and updates freq */
|
||||
/* finds best neuron (min dist-bias) and returns position */
|
||||
/* for frequently chosen neurons, freq[i] is high and bias[i] is negative */
|
||||
/* bias[i] = gamma*((1/netsize)-freq[i]) */
|
||||
|
||||
int i, dist, a, biasdist, betafreq;
|
||||
int bestpos, bestbiaspos, bestd, bestbiasd;
|
||||
int[] n;
|
||||
|
||||
bestd = ~(1 << 31);
|
||||
bestbiasd = bestd;
|
||||
bestpos = -1;
|
||||
bestbiaspos = bestpos;
|
||||
|
||||
for (i = 0; i < NETSIZE; i++) {
|
||||
n = network[i];
|
||||
dist = n[0] - b;
|
||||
if (dist < 0)
|
||||
dist = -dist;
|
||||
a = n[1] - g;
|
||||
if (a < 0)
|
||||
a = -a;
|
||||
dist += a;
|
||||
a = n[2] - r;
|
||||
if (a < 0)
|
||||
a = -a;
|
||||
dist += a;
|
||||
if (dist < bestd) {
|
||||
bestd = dist;
|
||||
bestpos = i;
|
||||
}
|
||||
biasdist = dist - ((bias[i]) >> (INTBIASSHIFT - NETBIASSHIFT));
|
||||
if (biasdist < bestbiasd) {
|
||||
bestbiasd = biasdist;
|
||||
bestbiaspos = i;
|
||||
}
|
||||
betafreq = (freq[i] >> BETASHIFT);
|
||||
freq[i] -= betafreq;
|
||||
bias[i] += (betafreq << GAMMASHIFT);
|
||||
}
|
||||
freq[bestpos] += BETA;
|
||||
bias[bestpos] -= BETAGAMMA;
|
||||
return (bestbiaspos);
|
||||
}
|
||||
}
|
||||
@ -1,7 +0,0 @@
|
||||
/**
|
||||
* GIF处理，来自：<a href="https://github.com/rtyley/animated-gif-lib-for-java">https://github.com/rtyley/animated-gif-lib-for-java</a>
|
||||
*
|
||||
* @author looly
|
||||
*
|
||||
*/
|
||||
package cn.hutool.swing.img.gif;
|
||||
Loading…
x
Reference in New Issue
Block a user