package com.basic.security.utils;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.LruCache;
import android.widget.ImageView;

/**
 * Created by hasee on 2018/7/17.
 */

public class ImageUtils {

    public static LruCache<String, Bitmap> imgCache;

    private static void init(){
        int maxCache = (int) (Runtime.getRuntime().maxMemory() / 1024);
        imgCache = new LruCache<String, Bitmap>(maxCache / 8){
            @Override
            protected int sizeOf(String key, Bitmap value) {
                return value.getByteCount() / 1024;
            }

            @Override
            protected void entryRemoved(boolean evicted, String key, Bitmap oldValue, Bitmap newValue) {
                oldValue.recycle();
                oldValue = null;
                super.entryRemoved(evicted, key, oldValue, newValue);
            }
        };
    }

    public static Bitmap setScaleBitmap(String path, ImageView imageView){
        if (imgCache == null){
            init();
        }
        Bitmap bitmap = imgCache.get(path);
        if (bitmap != null){
            imageView.setImageBitmap(bitmap);
            return bitmap;
        }
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(path, options);
        int imageWidth = options.outWidth;
        int imageHeight = options.outHeight;

        int viewWidth = imageView.getWidth();
        int viewHeight = imageView.getHeight();

        int scale = 1;
        if (viewWidth ==0 || viewHeight ==0){
            imageView.setImageBitmap(BitmapFactory.decodeFile(path));
            return null;
        }
        int scaleWidth = imageWidth / viewWidth;
        int scaleHeight = imageHeight / viewHeight;
        if (scaleWidth >= scaleHeight && scaleWidth > 1){
            scale = scaleWidth;
        }else if (scaleWidth < scaleHeight && scaleHeight > 1){
            scale = scaleHeight;
        }
        options.inSampleSize = scale;
        options.inJustDecodeBounds = false;
        options.inPreferredConfig = Bitmap.Config.RGB_565;
        bitmap = BitmapFactory.decodeFile(path, options);
        imageView.setImageBitmap(bitmap);
        imgCache.put(path, bitmap);
        return bitmap;
    }
}