Crop Bitmap
/*
* Copyright (C) 2008-2010 aki@akjava.com
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
//package com.akjava.lib.android.image;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Point;
import android.graphics.Rect;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory.Options;
import android.util.Log;
/**
*
* @author aki
* @version 1.0
* ?????????????
* ????????????????
*
*/
class ImageUtils {
public static final String[] imageExtensions={"jpg","png","jpeg","gif"};
private ImageUtils(){}
/**
* ????????????????????????????????????????
* ????????????????
*
* @param baseImage ???
* @param width ??
* @param height ??
* @return ?????????????????
*/
public static Bitmap fitImageNoMargin(Bitmap baseImage,int width,int height){
Point pt=calculateFitImage(baseImage,width,height,null);//TODO gc free
Bitmap resizedBitmap = Bitmap.createScaledBitmap(baseImage,
pt.x, pt.y, true);
return resizedBitmap;
}
/**
* ??????????????????????????????????
* ?????????????????
* ??????????????????????
*
* @param path
* @param width
* @param config
* @return
*/
public static Bitmap sampleSizeOpenBitmapByWidth(String path,int width,Bitmap.Config config){
Point size=parseJpegSize(path, null);
int rw=size.x/width;
int sampleSize=Math.max(rw, 1);
Bitmap bitmap=sampleSizeOpenBitmap(path, sampleSize);
return bitmap;
}
/**
* ??????????????????????????
*
*
* @param path
* @param width
* @param height
* @param config null????Bitmap.Config.RGB_565??????
* @return ?????????????????????????????
*/
public static Bitmap fitImage(String path,int width,int height,Bitmap.Config config){
//TODO set bgcolor
Point size=parseJpegSize(path, null);
int rw=size.x/width;
int rh=size.y/height;
int sampleSize=Math.min(rw, rh);
sampleSize=Math.max(sampleSize, 1);
Bitmap bitmap=sampleSizeOpenBitmap(path, sampleSize,config);
return fitImage(bitmap, width, height, config, true);
}
/**
* ????????????
*
* @param baseImage
* @param width
* @param height
* @param config null????Bitmap.Config.RGB_565??????
* @param doRecycleBase ???bitmap?recycle???????true??
* @return ?????????????????????????????
*/
public static Bitmap fitImage(Bitmap baseImage,int width,int height,Bitmap.Config config,boolean doRecycleBase){
if(baseImage==null){
throw new RuntimeException("baseImage is null");
}
if(config==null){
config=Bitmap.Config.RGB_565;
}
Point resizedP=calculateFitImage(baseImage, width, height, null);//TODO gc free
Bitmap resizedBitmap = Bitmap.createScaledBitmap(baseImage,
resizedP.x, resizedP.y, true);
if(doRecycleBase){//to avoid memory error
baseImage.recycle();
}
Bitmap returnBitmap=Bitmap.createBitmap(width, height, config);
Canvas canvas=new Canvas(returnBitmap);
canvas.drawBitmap(resizedBitmap, (width-resizedP.x)/2, (height-resizedP.y)/2,null);
resizedBitmap.recycle();
return returnBitmap;
}
/**
* ????????????????????????????
*
* @param baseImage
* @param width
* @param height
* @param receiver
* @return
*/
public static Point calculateFitImage(Bitmap baseImage,int width,int height,Point receiver){
if(baseImage==null){
throw new RuntimeException("baseImage is null");
}
if(receiver==null){
receiver=new Point();
}
int dw=width;
int dh=height;
if(dw!=0 && dh!=0 ){
double waspect=(double)dw/baseImage.getWidth();
double haspect=(double)dh/baseImage.getHeight();
if(waspect>haspect){//fit h
dw=(int) (baseImage.getWidth()*haspect);
}else{
dh=(int)(baseImage.getHeight()*waspect);
}
}
receiver.x=dw;
receiver.y=dh;
return receiver;
}
/**
* ????????????????????recyle?????
*
* @param baseImage
* @param width
* @param height
* @return
*/
public static Bitmap toTextureImage(Bitmap baseImage,int width,int height){
return toTextureImage(baseImage, width, height,false);
}
/**
* PNG ??????????
*
* @param bitmap
* @param output
* @return
* @throws FileNotFoundException
*/
public static boolean writeAsPng(Bitmap bitmap,String output) throws FileNotFoundException{
return bitmap.compress(Bitmap.CompressFormat.PNG, 1, new FileOutputStream(output));
}
/**
* ???????????????
*
* @param baseImage
* @param width must be divided 2 (like 256 or 512)
* @param height must be divided 2 (like 256 or 512)
* @return
*/
public static Bitmap toTextureImage(Bitmap baseImage,int width,int height,boolean recycle){
int owidth = baseImage.getWidth();
int oheight = baseImage.getHeight();
// calculate the scale - in this case = 0.4f
float scaleWidth = ((float) width) / owidth;
float scaleHeight = ((float) height) / oheight;
Matrix matrix = new Matrix();
// resize the bit map
matrix.postScale(scaleWidth, -scaleHeight);
// rotate the Bitmap
//matrix.postRotate(-180);
Bitmap resizedBitmap = Bitmap.createBitmap(baseImage, 0, 0,
owidth, oheight, matrix, true);
if(recycle){
baseImage.recycle();
}
Log.i("myapp","resized:"+resizedBitmap.getWidth()+"x"+resizedBitmap.getHeight());
return resizedBitmap;
}
/**
* ?????????????????????????
*
* @param baseImage
* @param width
* @param height
* @param rotateRight
* @return
*/
public static Bitmap toRotateTextureImage(Bitmap baseImage,int width,int height,boolean rotateRight){
int owidth = baseImage.getWidth();
int oheight = baseImage.getHeight();
// calculate the scale - in this case = 0.4f
float scaleWidth = ((float) width) / owidth;
float scaleHeight = ((float) height) / oheight;
Matrix matrix = new Matrix();
// resize the bit map
matrix.postScale(scaleWidth, -scaleHeight);
// rotate the Bitmap
if(rotateRight){
matrix.postRotate(90);
}else{
matrix.postRotate(-90);
}
Bitmap resizedBitmap = Bitmap.createBitmap(baseImage, 0, 0,
owidth, oheight, matrix, true);
Log.i("myapp","resized:"+resizedBitmap.getWidth()+"x"+resizedBitmap.getHeight());
return resizedBitmap;
}
/**
* ???????????sampleSize???????width?height??????????
*/
public static int lastSampleSize=1;
//public static BitmapFactory.Options bitmapOption;//cancel????????denger
/**
* ?????????????????????
* ???????????????????????????????????????
*
* @param path
* @param startSize
* @param config
* @return
*/
public static Bitmap sampleSizeOpenBitmap(String path, int startSize,
Config config) {
BitmapFactory.Options bitmapOption = new BitmapFactory.Options();
bitmapOption.inPreferredConfig=config;
return sampleSizeOpenBitmap(path, startSize,bitmapOption);
}
/**
* ?????????????????????
* ???????????????????????????????????????
*
* @param path
* @param startSize
* @param bitmapOption
* @return
*/
public static Bitmap sampleSizeOpenBitmap(String path, int startSize,
Options bitmapOption) {
int inSampleSize=startSize;
Bitmap bitmap=null;
for(int i=0;i<10;i++){
try{
bitmapOption.inSampleSize=inSampleSize;
bitmap=BitmapFactory.decodeFile(path,bitmapOption);
//Log.i("imageutils","decoded bitmap:"+bitmapOption.inSampleSize);
lastSampleSize=inSampleSize;
if(bitmap==null){
System.gc();//ready for next
}
}catch(Error e){
Log.i("imageutils","faild load:"+inSampleSize+" "+path);
}
if(bitmap!=null || bitmapOption.mCancel){
break;
}else{
//inSampleSize*=2;
inSampleSize+=1;
}
}
return bitmap;
}
/**
* ??????????????????????
*
* @param path
* @param width
* @param height
* @param config
* @return
*/
public static Bitmap sampleSizeOpenBitmap(String path,int width,int height,Config config){
Point size=parseJpegSize(path, null);
int rw=size.x/width;
int rh=size.y/height;
int sampleSize=Math.min(rw, rh);
sampleSize=Math.max(sampleSize, 1);
return sampleSizeOpenBitmap(path, sampleSize,config);
}
/**
* MemoryError????????????Content://????????
* ???? RGB565?????
* @see MediaImageUtils#loadImageFileOrUri(android.content.ContentResolver, String)
* @param path
* @param startSize
* @return
*/
public static Bitmap sampleSizeOpenBitmap(String path,int startSize){
return sampleSizeOpenBitmap(path, startSize,(Config) null);
}
/**
* ????????????????????
* @param name
* @return
*/
public static boolean isImageFile(String name){
for (int i = 0; i < imageExtensions.length; i++) {
if(name.toLowerCase().endsWith("."+imageExtensions[i])) {
return true;
}
}
return false;
}
/**
* ?????????
*
* @param bitmap
* @param rect
* @return
*/
public static Bitmap cropBitmap(Bitmap bitmap,Rect rect){
int w=rect.right-rect.left;
int h=rect.bottom-rect.top;
Bitmap ret=Bitmap.createBitmap(w, h, bitmap.getConfig());
Canvas canvas=new Canvas(ret);
canvas.drawBitmap(bitmap, -rect.left, -rect.top, null);
return ret;
}
/**
* JPEG???????????
*
* @param path
* @param receiver
* @return
*/
public static Point parseJpegSize(String path,Point receiver){
if(receiver==null){
receiver=new Point();
}
Options option=new BitmapFactory.Options();
option.inJustDecodeBounds=true;
BitmapFactory.decodeFile(path,option);
receiver.x=option.outWidth;
receiver.y=option.outHeight;
return receiver;
}
}
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