package com.longluo.ebookreader.widget.transform;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;

import androidx.annotation.NonNull;

import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
import com.bumptech.glide.load.resource.bitmap.BitmapTransformation;

import java.security.MessageDigest;

public class CircleTransform extends BitmapTransformation {

    public CircleTransform(Context context) {
        super();
    }

    /**
     * @param pool: 图片池，这个之后会谈到。
     * @param toTransform:需要进行处理的图片
     * @param outWidth:图片的宽
     * @param outHeight:图片的高
     * @return 返回处理完的图片
     */
    @Override
    protected Bitmap transform(BitmapPool pool, Bitmap toTransform, int outWidth, int outHeight) {
        Paint paint = new Paint();
        //初始化画笔
        paint.setStyle(Paint.Style.FILL);
        paint.setAntiAlias(true);
        paint.setDither(true);

        int width = toTransform.getWidth();
        int height = toTransform.getHeight();
        int size = Math.min(width, height);
        int x = (width - size) / 2;
        int y = (height - size) / 2;
        Bitmap result = pool.get(size, size, Bitmap.Config.ARGB_8888);
        if (result == null) {
            result = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
        }
        //
        Canvas canvas = new Canvas(result);
        int radius = size / 2;
        canvas.drawCircle(radius, radius, radius, paint);
        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
        canvas.drawBitmap(toTransform, -x, -y, paint);
        return result;
    }

    @Override
    public void updateDiskCacheKey(@NonNull MessageDigest messageDigest) {

    }
}
