package cn.xsshome.imagetool.util;
import java.net.*;
import java.io.*;
import java.util.*;
import java.awt.*;
import java.awt.image.*;
/**
* @ClassName: GifDecoder
* @description: Gif图片处理类
* @author: 小帅丶
* @create: 2019-05-10
**/
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 MaxStackSize = 4096;
// max decoder pixel stack size
// LZW decoder working arrays
protected short[] prefix;
protected byte[] suffix;
protected byte[] pixelStack;
protected byte[] pixels;
protected ArrayList frames; // frames read from current file
protected int frameCount;
static class GifFrame {
public GifFrame(BufferedImage im, 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(int n) {
//
delay = -1;
if ((n >= 0) && (n < frameCount)) {
delay = ((GifFrame) 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
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
int n = frameCount - 2;
if (n > 0) {
lastImage = getFrame(n - 1);
} else {
lastImage = null;
}
}
if (lastImage != null) {
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
Graphics2D g = image.createGraphics();
Color c = null;
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) {
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
int index = ((int) pixels[sx++]) & 0xff;
int c = act[index];
if (c != 0) {
dest[dx] = c;
}
dx++;
}
}
}
}
/**
* Gets the image contents of frame n.
*
* @return BufferedImage representation of frame, or null if n is invalid.
*/
public BufferedImage getFrame(int n) {
BufferedImage im = null;
if ((n >= 0) && (n < frameCount)) {
im = ((GifFrame) 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(BufferedInputStream is) {
init();
if (is != null) {
in = is;
readHeader();
if (!err()) {
readContents();
if (frameCount < 0) {
status = STATUS_FORMAT_ERROR;
}
}
} else {
status = STATUS_OPEN_ERROR;
}
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图片转字符图片工具类,支持 Gif 动画、图片合并、图片加水印、文字消除锯齿、图片无损保存、图片像素风、九宫格图、百叶图、修改图片DPI等图片处理其他工具类方法。
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收起资源包目录
imagetool-master.zip (54个子文件)
imagetool-master
.classpath 849B
.settings
org.eclipse.jdt.core.prefs 243B
org.eclipse.core.resources.prefs 119B
org.eclipse.m2e.core.prefs 90B
pom.xml 593B
src
test
java
cn
xsshome
imagetool
AgainArray.java 1KB
Sample.java 772B
GraySample.java 976B
GongGeSample.java 765B
FontImgMergeSample.java 1KB
RotateSample.java 1KB
main
files
source_pixel.jpg 77KB
gray_source.jpeg 10KB
pixel.jpg 840KB
gray_gray.jpeg 8KB
gray_3byte.jpeg 8KB
aa02.jpg 8KB
banner.jpg 56KB
one.png 38KB
mergebanner.jpg 141KB
aa01.jpg 8KB
java
cn
xsshome
imagetool
zoom
ZoomUtil.java 8KB
ImageHelper.java 12KB
xsexception
ImageTypeException.java 554B
FileNumberException.java 337B
convert
ImageToChar.java 12KB
ImageToASCII.java 7KB
slideverifycode
SlideVerifyCodeGenerateUtil.java 11KB
SlideVerifyCode.java 3KB
constants
ImageSizeConts.java 2KB
ImageType.java 443B
util
NeuQuant.java 12KB
ImageDPIHandleUtil.java 2KB
ImageToCircleUtil.java 6KB
PngConvertUtil.java 3KB
MirrorImageUtil.java 2KB
ImageWaterMarkUtil.java 19KB
AnimatedGifEncoder.java 13KB
ImagePixelUtil.java 2KB
ImageGrayUtil.java 3KB
LZWEncoder.java 8KB
Base64Util.java 2KB
ImageLossLessUtil.java 2KB
GifDecoder.java 22KB
NickNameGenerateAvatarUtil.java 3KB
PngColoringUtil.java 3KB
MergeImageFontUtil.java 3KB
MergeImageUtil.java 4KB
GifImageUtil.java 13KB
GongGeUtil.java 2KB
RotateImageUtil.java 4KB
LICENSE 1KB
.project 767B
.gitignore 9B
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