package com.rubekid.springmvc.utils;
import java.awt.AlphaComposite;
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Collection;
import javax.imageio.ImageIO;
import net.sf.jmimemagic.MagicException;
import net.sf.jmimemagic.MagicMatchNotFoundException;
import net.sf.jmimemagic.MagicParseException;
import org.apache.commons.io.FileUtils;
import org.summercool.image.AnimatedGifEncoder;
import org.summercool.image.GifDecoder;
import org.summercool.image.Scalr;
import org.summercool.image.Scalr.Method;
import org.summercool.image.Scalr.Mode;
import com.sun.image.codec.jpeg.ImageFormatException;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
import eu.medsea.mimeutil.MimeUtil;
/**
* 图片压缩处理
* @author Rubekid
*
*/
public class ImageScale {
public static final String TYPE_JPEG = "jpg";
public static final String TYPE_PNG = "png";
public static final String TYPE_GIF = "gif";
public static final String TYPE_BMP = "bmp";
/**
* 图片缩放
* @param srcFile
* @param destFile
* @param maxWidth
* @param maxHeight
* @param type
* @param quality
* @throws IOException
*/
public static void resize(File srcFile, File destFile, int maxWidth, int maxHeight, String type, float quality) throws IOException{
if(TYPE_GIF.equals(type)){
resizeGif(srcFile, destFile, maxWidth, maxHeight);
}
else if(TYPE_PNG.equals(type)){
resizePng(srcFile, destFile, maxWidth, maxHeight);
}
else{
resizeJpeg(srcFile, destFile, maxWidth, maxHeight, quality);
}
}
/**
* 图片缩放
* @param srcFile
* @param destFile
* @param maxWidth
* @param maxHeight
* @param type
* @throws IOException
*/
public static void resize(File srcFile, File destFile, int maxWidth, int maxHeight, String type) throws IOException{
resize(srcFile, destFile, maxWidth, maxHeight, type, 0.8f);
}
/**
* 图片缩放
* @param srcFile
* @param destFile
* @param maxWidth
* @param maxHeight
* @throws Exception
*/
public static void resize(File srcFile, File destFile, int maxWidth, int maxHeight, float quality) throws Exception{
resize(srcFile, destFile, maxWidth, maxHeight, getType(srcFile), quality);
}
/**
* 图片缩放
* @param srcFile
* @param destFile
* @param maxWidth
* @param maxHeight
* @throws Exception
*/
public static void resize(File srcFile, File destFile, int maxWidth, int maxHeight) throws Exception{
resize(srcFile, destFile, maxWidth, maxHeight, getType(srcFile));
}
/**
* JPEG图片缩放
* @param srcFile
* @param destFile
* @param maxWidth
* @param maxHeight
* @throws IOException
* @throws ImageFormatException
*/
public static void resizeJpeg(File srcFile, File destFile, int maxWidth, int maxHeight, float quality) throws IOException{
BufferedImage image = ImageIO.read(srcFile);
double scale = 0.8f;
AffineTransform atf = AffineTransform.getTranslateInstance(scale, scale);
//AffineTransformOp affineTransformOp = new AffineTransformOp(xform, interpolationType)
double rate = getResizeRate(srcFile, maxWidth, maxHeight);
int width = (int)(image.getWidth() * rate);
int height =(int) (image.getHeight() * rate);
image = Scalr.resize(image, Method.AUTOMATIC, Mode.AUTOMATIC, width, height);
BufferedImage bufferedImage = new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_INT_RGB);
Graphics2D g = bufferedImage.createGraphics();
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, 1));
g.fillRect(0, 0, image.getWidth(), image.getHeight());
g.drawImage(image, 0, 0, null);
image = bufferedImage;
FileOutputStream out = new FileOutputStream(destFile);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(image);
param.setQuality(quality, false);
encoder.setJPEGEncodeParam(param);
encoder.encode(image);
}
/**
* PNG图片缩放
* @param srcFile
* @param destFile
* @param maxWidth
* @param maxHeight
* @throws IOException
*/
public static void resizePng(File srcFile, File destFile, int maxWidth, int maxHeight) throws IOException{
BufferedImage bufferedImage = ImageIO.read(srcFile);
double rate = getResizeRate(srcFile, maxWidth, maxHeight);
if(rate == 1){
FileUtils.copyFile(srcFile, destFile);
}
else{
int width = (int)(bufferedImage.getWidth() * rate);
int height =(int) (bufferedImage.getHeight() * rate);
BufferedImage result = Scalr.resize(bufferedImage,Method.AUTOMATIC, Mode.AUTOMATIC, width, height);
ImageIO.write(result, "png", destFile);
}
}
/**
* GIF图片缩放
* @param srcFile
* @param destFile
* @param maxWidth
* @param maxHeight
* @throws IOException
*/
public static void resizeGif(File srcFile, File destFile, int maxWidth, int maxHeight) throws IOException{
GifDecoder gd = new GifDecoder();
int status = gd.read(new FileInputStream(srcFile));
if (status != GifDecoder.STATUS_OK) {
return;
}
double rate = getResizeRate(srcFile, maxWidth, maxHeight);
if(rate == 1){
FileUtils.copyFile(srcFile, destFile);
}
else{
AnimatedGifEncoder ge = new AnimatedGifEncoder();
ge.start(new FileOutputStream(destFile));
ge.setRepeat(0);
for (int i = 0; i < gd.getFrameCount(); i++) {
BufferedImage frame = gd.getFrame(i);
int width = frame.getWidth();
int height = frame.getHeight();
width = (int) (width * rate);
height = (int) (height * rate);
BufferedImage rescaled = Scalr.resize(frame, Mode.FIT_EXACT, width, height);
int delay = gd.getDelay(i);
ge.setDelay(delay);
ge.addFrame(rescaled);
}
ge.finish();
}
}
/**
* 获取缩放比例
* @param srcFile
* @param MaxWidth
* @param MaxHeight
* @return
* @throws IOException
*/
public static double getResizeRate( File srcFile, int maxWidth, int maxHeight) throws IOException{
double rate = 1;
if(maxWidth==0 && maxHeight == 0){
return rate;
}
BufferedImage bImage = ImageIO.read(srcFile);
int width = bImage.getWidth();
int height = bImage.getHeight();
if(maxWidth == 0 && height > maxHeight){
rate = (double)maxHeight / height;
}
else if(maxHeight == 0 && width > maxWidth){
rate = (double)maxWidth / width;
}
else if((width > maxWidth || height > maxHeight) && maxWidth > 0 && maxHeight > 0){
rate = (double)maxWidth / width > (double)maxHeight / height ? (double)maxHeight / height : (double)maxWidth / width ;
}
if(rate > 1){
rate = 1;
}
return rate;
}
/**
*
* @param file
* @return
* @Exception
*/
public static String getMimeType(File file) throws Exception{
MimeUtil.registerMimeDetector("eu.medsea.mimeutil.detector.MagicMimeMimeDetector");
Collection<?> mimeTypes = MimeUtil.getMimeTypes(file);
return mimeTypes.toString();
}
/**
* 获取图片类型（后缀）
* @param file
* @return
* @throws MagicException
* @throws MagicMatchNotFoundException
* @throws MagicParseException
*/
public static String getType(File file) throws Exception{
String mimeType = getMimeType(file);
return getType(mimeType);
}
/**
* 获取图片类型（后缀）
* @param mimeType
* @return
*/
public static String getType(String mimeType){
if("image/gif".equals(mimeType)){
return TYPE_GIF;
}
else if("image/png".equals(mimeType) || "image/x-png".equals(mimeType)){
return TYPE_PNG;
}
else if("image/bmp".equals(mimeType) || "image/x-ms-bmp".equals(mimeType)){
return TYPE_BMP;
}
return TYPE_JPEG;
}
}
