Librairie GIF animé + Utilitaire de gestion de couleur RGB
- Support des GIF animés (pour le système de particule de PandacubeSpigot) - Possibilité de générer une couleur d'arc en ciel selon une valeur
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src/fr/pandacube/java/util/ColorUtil.java
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src/fr/pandacube/java/util/ColorUtil.java
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package fr.pandacube.java.util;
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import java.awt.Color;
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import java.util.ArrayList;
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import java.util.List;
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public class ColorUtil {
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/*
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* Rainbow
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*/
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private static List<Color> rainbowColors = new ArrayList<>();
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/**
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* Get a rainbow color
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* @param variation from 0 (include) to 1 (exclude).
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* 0 is red, 1/6 is yellow, 2/6 is green, 3/6 is cyan, 4/6 is blue, 5/6 is magenta
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* @return
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*/
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public static Color getRainbowColor(double variation) {
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synchronized (rainbowColors) {
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if (rainbowColors.isEmpty()) {
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for (int g=0; g<255; g++) rainbowColors.add(new Color(255, g, 0));
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for (int r=255; r>0; r--) rainbowColors.add(new Color(r, 255, 0));
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for (int b=0; b<255; b++) rainbowColors.add(new Color(0, 255, b));
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for (int g=255; g>0; g--) rainbowColors.add(new Color(0, g, 255));
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for (int r=0; r<255; r++) rainbowColors.add(new Color(r, 0, 255));
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for (int b=255; b>0; b--) rainbowColors.add(new Color(255, 0, b));
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}
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}
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while (variation >= 1) variation -= 1d;
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while (variation < 0) variation += 1d;
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return rainbowColors.get((int)(variation * rainbowColors.size()));
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}
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}
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787
src/fr/pandacube/java/util/GifDecoder.java
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src/fr/pandacube/java/util/GifDecoder.java
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package fr.pandacube.java.util;
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import java.net.URL;
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import java.util.ArrayList;
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import java.awt.AlphaComposite;
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import java.awt.Color;
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import java.awt.Dimension;
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import java.awt.Graphics2D;
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import java.awt.Rectangle;
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import java.awt.image.BufferedImage;
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import java.awt.image.DataBufferInt;
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import java.io.BufferedInputStream;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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/**
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* Class GifDecoder - Decodes a GIF file into one or more frames.
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* <br><pre>
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* Example:
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* GifDecoder d = new GifDecoder();
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* d.read("sample.gif");
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* int n = d.getFrameCount();
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* for (int i = 0; i < n; i++) {
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* BufferedImage frame = d.getFrame(i); // frame i
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* int t = d.getDelay(i); // display duration of frame in milliseconds
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* // do something with frame
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* }
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* </pre>
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* No copyright asserted on the source code of this class. May be used for
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* any purpose, however, refer to the Unisys LZW patent for any additional
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* restrictions. Please forward any corrections to questions at fmsware.com.
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*
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* @author Kevin Weiner, FM Software; LZW decoder adapted from John Cristy's ImageMagick.
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* @version 1.03 November 2003
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*
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*/
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public class GifDecoder {
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/**
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* File read status: No errors.
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*/
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public static final int STATUS_OK = 0;
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/**
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* File read status: Error decoding file (may be partially decoded)
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*/
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public static final int STATUS_FORMAT_ERROR = 1;
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/**
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* File read status: Unable to open source.
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*/
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public static final int STATUS_OPEN_ERROR = 2;
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protected BufferedInputStream in;
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protected int status;
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protected int width; // full image width
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protected int height; // full image height
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protected boolean gctFlag; // global color table used
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protected int gctSize; // size of global color table
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protected int loopCount = 1; // iterations; 0 = repeat forever
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protected int[] gct; // global color table
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protected int[] lct; // local color table
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protected int[] act; // active color table
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protected int bgIndex; // background color index
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protected int bgColor; // background color
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protected int lastBgColor; // previous bg color
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protected int pixelAspect; // pixel aspect ratio
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protected boolean lctFlag; // local color table flag
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protected boolean interlace; // interlace flag
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protected int lctSize; // local color table size
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protected int ix, iy, iw, ih; // current image rectangle
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protected Rectangle lastRect; // last image rect
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protected BufferedImage image; // current frame
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protected BufferedImage lastImage; // previous frame
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protected byte[] block = new byte[256]; // current data block
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protected int blockSize = 0; // block size
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// last graphic control extension info
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protected int dispose = 0;
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// 0=no action; 1=leave in place; 2=restore to bg; 3=restore to prev
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protected int lastDispose = 0;
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protected boolean transparency = false; // use transparent color
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protected int delay = 0; // delay in milliseconds
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protected int transIndex; // transparent color index
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protected static final int MaxStackSize = 4096;
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// max decoder pixel stack size
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// LZW decoder working arrays
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protected short[] prefix;
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protected byte[] suffix;
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protected byte[] pixelStack;
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protected byte[] pixels;
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protected ArrayList<GifFrame> frames; // frames read from current file
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protected int frameCount;
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static class GifFrame {
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public GifFrame(BufferedImage im, int del) {
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image = im;
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delay = del;
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}
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public BufferedImage image;
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public int delay;
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}
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/**
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* Gets display duration for specified frame.
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*
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* @param n int index of frame
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* @return delay in milliseconds
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*/
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public int getDelay(int n) {
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//
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delay = -1;
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if ((n >= 0) && (n < frameCount)) {
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delay = ((GifFrame) frames.get(n)).delay;
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}
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return delay;
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}
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/**
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* Gets the number of frames read from file.
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* @return frame count
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*/
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public int getFrameCount() {
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return frameCount;
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}
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/**
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* Gets the first (or only) image read.
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*
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* @return BufferedImage containing first frame, or null if none.
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*/
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public BufferedImage getImage() {
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return getFrame(0);
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}
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/**
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* Gets the "Netscape" iteration count, if any.
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* A count of 0 means repeat indefinitiely.
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*
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* @return iteration count if one was specified, else 1.
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*/
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public int getLoopCount() {
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return loopCount;
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}
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/**
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* Creates new frame image from current data (and previous
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* frames as specified by their disposition codes).
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*/
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protected void setPixels() {
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// expose destination image's pixels as int array
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int[] dest =
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((DataBufferInt) image.getRaster().getDataBuffer()).getData();
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// fill in starting image contents based on last image's dispose code
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if (lastDispose > 0) {
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if (lastDispose == 3) {
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// use image before last
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int n = frameCount - 2;
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if (n > 0) {
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lastImage = getFrame(n - 1);
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} else {
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lastImage = null;
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}
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}
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if (lastImage != null) {
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int[] prev =
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((DataBufferInt) lastImage.getRaster().getDataBuffer()).getData();
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System.arraycopy(prev, 0, dest, 0, width * height);
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// copy pixels
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if (lastDispose == 2) {
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// fill last image rect area with background color
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Graphics2D g = image.createGraphics();
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Color c = null;
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if (transparency) {
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c = new Color(0, 0, 0, 0); // assume background is transparent
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} else {
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c = new Color(lastBgColor); // use given background color
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}
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g.setColor(c);
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g.setComposite(AlphaComposite.Src); // replace area
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g.fill(lastRect);
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g.dispose();
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}
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}
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}
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// copy each source line to the appropriate place in the destination
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int pass = 1;
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int inc = 8;
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int iline = 0;
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for (int i = 0; i < ih; i++) {
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int line = i;
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if (interlace) {
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if (iline >= ih) {
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pass++;
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switch (pass) {
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case 2 :
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iline = 4;
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break;
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case 3 :
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iline = 2;
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inc = 4;
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break;
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case 4 :
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iline = 1;
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inc = 2;
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}
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}
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line = iline;
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iline += inc;
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}
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line += iy;
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if (line < height) {
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int k = line * width;
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int dx = k + ix; // start of line in dest
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int dlim = dx + iw; // end of dest line
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if ((k + width) < dlim) {
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dlim = k + width; // past dest edge
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}
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int sx = i * iw; // start of line in source
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while (dx < dlim) {
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// map color and insert in destination
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int index = ((int) pixels[sx++]) & 0xff;
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int c = act[index];
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if (c != 0) {
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dest[dx] = c;
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}
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dx++;
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}
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}
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}
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}
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/**
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* Gets the image contents of frame n.
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*
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* @return BufferedImage representation of frame, or null if n is invalid.
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*/
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public BufferedImage getFrame(int n) {
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BufferedImage im = null;
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if ((n >= 0) && (n < frameCount)) {
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im = ((GifFrame) frames.get(n)).image;
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}
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return im;
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}
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/**
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* Gets image size.
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*
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* @return GIF image dimensions
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*/
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public Dimension getFrameSize() {
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return new Dimension(width, height);
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}
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/**
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* Reads GIF image from stream
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*
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* @param BufferedInputStream containing GIF file.
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* @return read status code (0 = no errors)
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*/
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public int read(BufferedInputStream is) {
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init();
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if (is != null) {
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in = is;
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readHeader();
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if (!err()) {
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readContents();
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if (frameCount < 0) {
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status = STATUS_FORMAT_ERROR;
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}
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}
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} else {
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status = STATUS_OPEN_ERROR;
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}
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try {
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is.close();
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} catch (IOException e) {
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}
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return status;
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}
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/**
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* Reads GIF image from stream
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*
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* @param InputStream containing GIF file.
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* @return read status code (0 = no errors)
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*/
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public int read(InputStream is) {
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init();
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if (is != null) {
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if (!(is instanceof BufferedInputStream))
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is = new BufferedInputStream(is);
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in = (BufferedInputStream) is;
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readHeader();
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if (!err()) {
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readContents();
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if (frameCount < 0) {
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status = STATUS_FORMAT_ERROR;
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}
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}
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} else {
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status = STATUS_OPEN_ERROR;
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}
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try {
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is.close();
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} catch (IOException e) {
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}
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return status;
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}
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/**
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* Reads GIF file from specified file/URL source
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* (URL assumed if name contains ":/" or "file:")
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*
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* @param name String containing source
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* @return read status code (0 = no errors)
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*/
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public int read(String name) {
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status = STATUS_OK;
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try {
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name = name.trim().toLowerCase();
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if ((name.indexOf("file:") >= 0) ||
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(name.indexOf(":/") > 0)) {
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URL url = new URL(name);
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in = new BufferedInputStream(url.openStream());
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} else {
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in = new BufferedInputStream(new FileInputStream(name));
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}
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status = read(in);
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} catch (IOException e) {
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status = STATUS_OPEN_ERROR;
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}
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return status;
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}
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/**
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* Decodes LZW image data into pixel array.
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* Adapted from John Cristy's ImageMagick.
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*/
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protected void decodeImageData() {
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int NullCode = -1;
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int npix = iw * ih;
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int available,
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clear,
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code_mask,
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code_size,
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end_of_information,
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in_code,
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old_code,
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bits,
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code,
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count,
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i,
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datum,
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data_size,
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first,
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top,
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bi,
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pi;
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if ((pixels == null) || (pixels.length < npix)) {
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pixels = new byte[npix]; // allocate new pixel array
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}
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if (prefix == null) prefix = new short[MaxStackSize];
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if (suffix == null) suffix = new byte[MaxStackSize];
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if (pixelStack == null) pixelStack = new byte[MaxStackSize + 1];
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// Initialize GIF data stream decoder.
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data_size = read();
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clear = 1 << data_size;
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end_of_information = clear + 1;
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available = clear + 2;
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old_code = NullCode;
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code_size = data_size + 1;
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code_mask = (1 << code_size) - 1;
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for (code = 0; code < clear; code++) {
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prefix[code] = 0;
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suffix[code] = (byte) code;
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}
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// Decode GIF pixel stream.
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datum = bits = count = first = top = pi = bi = 0;
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for (i = 0; i < npix;) {
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if (top == 0) {
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if (bits < code_size) {
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// Load bytes until there are enough bits for a code.
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if (count == 0) {
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// Read a new data block.
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count = readBlock();
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if (count <= 0)
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break;
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bi = 0;
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}
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datum += (((int) block[bi]) & 0xff) << bits;
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bits += 8;
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bi++;
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count--;
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continue;
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}
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// Get the next code.
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code = datum & code_mask;
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datum >>= code_size;
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bits -= code_size;
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// Interpret the code
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if ((code > available) || (code == end_of_information))
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break;
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if (code == clear) {
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// Reset decoder.
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code_size = data_size + 1;
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code_mask = (1 << code_size) - 1;
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available = clear + 2;
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old_code = NullCode;
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continue;
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}
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if (old_code == NullCode) {
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pixelStack[top++] = suffix[code];
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old_code = code;
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first = code;
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continue;
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}
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in_code = code;
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if (code == available) {
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pixelStack[top++] = (byte) first;
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code = old_code;
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}
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while (code > clear) {
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pixelStack[top++] = suffix[code];
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code = prefix[code];
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}
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first = ((int) suffix[code]) & 0xff;
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// Add a new string to the string table,
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if (available >= MaxStackSize) {
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pixelStack[top++] = (byte) first;
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continue;
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}
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pixelStack[top++] = (byte) first;
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prefix[available] = (short) old_code;
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suffix[available] = (byte) first;
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available++;
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if (((available & code_mask) == 0)
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&& (available < MaxStackSize)) {
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code_size++;
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code_mask += available;
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}
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old_code = in_code;
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}
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// Pop a pixel off the pixel stack.
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top--;
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pixels[pi++] = pixelStack[top];
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i++;
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}
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for (i = pi; i < npix; i++) {
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pixels[i] = 0; // clear missing pixels
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}
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}
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/**
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* Returns true if an error was encountered during reading/decoding
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*/
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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.
|
||||
*/
|
||||
protected int read() {
|
||||
int curByte = 0;
|
||||
try {
|
||||
curByte = in.read();
|
||||
} catch (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 = 0;
|
||||
while (n < blockSize) {
|
||||
count = in.read(block, n, blockSize - n);
|
||||
if (count == -1)
|
||||
break;
|
||||
n += count;
|
||||
}
|
||||
} catch (IOException e) {
|
||||
}
|
||||
|
||||
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(int ncolors) {
|
||||
int nbytes = 3 * ncolors;
|
||||
int[] tab = null;
|
||||
byte[] c = new byte[nbytes];
|
||||
int n = 0;
|
||||
try {
|
||||
n = in.read(c);
|
||||
} catch (IOException e) {
|
||||
}
|
||||
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) {
|
||||
int r = ((int) c[j++]) & 0xff;
|
||||
int g = ((int) c[j++]) & 0xff;
|
||||
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();
|
||||
String app = "";
|
||||
for (int i = 0; i < 11; i++) {
|
||||
app += (char) block[i];
|
||||
}
|
||||
if (app.equals("NETSCAPE2.0")) {
|
||||
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
|
||||
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() {
|
||||
String id = "";
|
||||
for (int i = 0; i < 6; i++) {
|
||||
id += (char) read();
|
||||
}
|
||||
if (!id.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();
|
||||
|
||||
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
|
||||
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
|
||||
int b1 = ((int) block[1]) & 0xff;
|
||||
int b2 = ((int) block[2]) & 0xff;
|
||||
loopCount = (b2 << 8) | b1;
|
||||
}
|
||||
} while ((blockSize > 0) && !err());
|
||||
}
|
||||
|
||||
/**
|
||||
* Reads next 16-bit value, LSB first
|
||||
*/
|
||||
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;
|
||||
/*int dispose = 0;
|
||||
boolean transparency = false;
|
||||
int delay = 0;*/
|
||||
lct = null;
|
||||
}
|
||||
|
||||
/**
|
||||
* Skips variable length blocks up to and including
|
||||
* next zero length block.
|
||||
*/
|
||||
protected void skip() {
|
||||
do {
|
||||
readBlock();
|
||||
} while ((blockSize > 0) && !err());
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user