/*
* Copyright (c) 2014.
* Jackrex
*/
package info.jackrex.androidcachefoundation.cachefoundation.utils.Image;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
public class ImageUtils {
public static Bitmap resizeBitmap(Bitmap bitmap, int maxWidth, int maxHeight) {
int originWidth = bitmap.getWidth();
int originHeight = bitmap.getHeight();
// no need to resize
if (originWidth < maxWidth && originHeight < maxHeight) {
return bitmap;
}
int width = originWidth;
int height = originHeight;
// 若图片过宽, 则保持长宽比缩放图片
if (originWidth > maxWidth) {
width = maxWidth;
double i = originWidth * 1.0 / maxWidth;
height = (int) Math.floor(originHeight / i);
bitmap = Bitmap.createScaledBitmap(bitmap, width, height, false);
}
// 若图片过长, 则从上端截取
if (height > maxHeight) {
height = maxHeight;
bitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height);
}
return compressImage(bitmap);
}
private Bitmap getimage(String srcPath) {
BitmapFactory.Options newOpts = new BitmapFactory.Options();
//开始读入图片，此时把options.inJustDecodeBounds 设回true了
newOpts.inJustDecodeBounds = true;
Bitmap bitmap = BitmapFactory.decodeFile(srcPath,newOpts);//此时返回bm为空
newOpts.inJustDecodeBounds = false;
int w = newOpts.outWidth;
int h = newOpts.outHeight;
//现在主流手机比较多是800*480分辨率，所以高和宽我们设置为
float hh = 800f;//这里设置高度为800f
float ww = 480f;//这里设置宽度为480f
//缩放比。由于是固定比例缩放，只用高或者宽其中一个数据进行计算即可
int be = 1;//be=1表示不缩放
if (w > h && w > ww) {//如果宽度大的话根据宽度固定大小缩放
be = (int) (newOpts.outWidth / ww);
} else if (w < h && h > hh) {//如果高度高的话根据宽度固定大小缩放
be = (int) (newOpts.outHeight / hh);
}
if (be <= 0)
be = 1;
newOpts.inSampleSize = be;//设置缩放比例
//重新读入图片，注意此时已经把options.inJustDecodeBounds 设回false了
bitmap = BitmapFactory.decodeFile(srcPath, newOpts);
return compressImage(bitmap);//压缩好比例大小后再进行质量压缩
}
private static Bitmap compressImage(Bitmap image) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
image.compress(CompressFormat.JPEG, 100, baos);//质量压缩方法，这里100表示不压缩，把压缩后的数据存放到baos中
int options = 100;
while ( baos.toByteArray().length / 1024>100) { //循环判断如果压缩后图片是否大于100kb,大于继续压缩
baos.reset();//重置baos即清空baos
image.compress(CompressFormat.JPEG, options, baos);//这里压缩options%，把压缩后的数据存放到baos中
options -= 10;//每次都减少10
}
ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());//把压缩后的数据baos存放到ByteArrayInputStream中
Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);//把ByteArrayInputStream数据生成图片
return bitmap;
}
/**
* 转换图片成圆形
* @param bitmap 传入Bitmap对象
* @return
*/
public static Bitmap toRoundBitmap(Bitmap bitmap) {
int width = bitmap.getWidth();
int height = bitmap.getHeight();
float roundPx;
float left,top,right,bottom,dst_left,dst_top,dst_right,dst_bottom;
if (width <= height) {
roundPx = width / 2;
top = 0;
bottom = width;
left = 0;
right = width;
height = width;
dst_left = 0;
dst_top = 0;
dst_right = width;
dst_bottom = width;
} else {
roundPx = height / 2;
float clip = (width - height) / 2;
left = clip;
right = width - clip;
top = 0;
bottom = height;
width = height;
dst_left = 0;
dst_top = 0;
dst_right = height;
dst_bottom = height;
}
Bitmap output = Bitmap.createBitmap(width,
height, Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final int color = 0xff424242;
final Paint paint = new Paint();
final Rect src = new Rect((int)left, (int)top, (int)right, (int)bottom);
final Rect dst = new Rect((int)dst_left, (int)dst_top, (int)dst_right, (int)dst_bottom);
final RectF rectF = new RectF(dst);
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap, src, dst, paint);
return output;
}
public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, int pixels) {
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap
.getHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final int color = 0xff424242;
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
final RectF rectF = new RectF(rect);
final float roundPx = pixels; //圆角
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN)); //Mode.SRC_IN 用前面画的“圆角矩形”对bitmap进行裁剪。
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
}
//生成圆角图片
public static Bitmap GetRoundedCornerBitmap(Bitmap image, float outerRadiusRat) {
Drawable imageDrawable = new BitmapDrawable(image);
// 新建一个新的输出图片
Bitmap output = Bitmap.createBitmap(image.getWidth(), image.getHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(output);
// 新建一个矩形
RectF outerRect = new RectF(0, 0, image.getWidth(), image.getHeight());
// 产生一个红色的圆角矩形
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setColor(Color.RED);
canvas.drawRoundRect(outerRect, outerRadiusRat, outerRadiusRat, paint);
// 将源图片绘制到这个圆角矩形上
//详解见http://lipeng88213.iteye.com/blog/1189452
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
imageDrawable.setBounds(0, 0, image.getWidth(), image.getHeight());
canvas.saveLayer(outerRect, paint, Canvas.ALL_SAVE_FLAG);
imageDrawable.draw(canvas);
canvas.restore();
return output;
}
}
