Android使用Glide给图片加锯齿效果

版权声明：转载请注明出处。作者：两仪织，博客地址：http://blog.csdn.net/u013894427 https://blog.csdn.net/u013894427/article/details/88064486

效果,给图片顶部加上矩形图层

思路:使用小型的图层重复来模拟锯齿状图形

Glide版本:4.9.0

Glide.with(this).load(bitmap)
                .transform(new SerrationTransformation(MainActivity.this))
                .into(imageView);

temp的示例:

result的示例,就是重复多次来构成锯齿的Bitmap

最终的效果图:

核心代码如下:
SerrationTransformation.java

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.support.annotation.NonNull;
import android.util.Log;

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

import java.security.MessageDigest;
import java.text.DecimalFormat;

public class SerrationTransformation extends BitmapTransformation
{
    float radius = 0f;
    float count = 120;
    String TAG = "Transform";

    public SerrationTransformation(Context context)
    {
    }

    @Override
    protected Bitmap transform(@NonNull BitmapPool pool, @NonNull Bitmap toTransform, int outWidth, int outHeight)
    {

        return biteBitmap(pool, toTransform);
    }

    private Bitmap biteBitmap(BitmapPool pool, Bitmap source)
    {
        if (source == null)
            return null;

        Bitmap result = pool.get(source.getWidth(), source.getHeight(), Bitmap.Config.ARGB_8888);
        if (result == null)
        {
            result = Bitmap.createBitmap(source.getWidth(), source.getHeight(), Bitmap.Config.ARGB_8888);
        }
        Canvas canvas = new Canvas(result);
        Paint newPaint = new Paint();
        //设置画笔图层为原图
        newPaint.setShader(new BitmapShader(source, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));
        newPaint.setAntiAlias(true);
        RectF rectF = new RectF(0, 0, source.getWidth(), source.getHeight());
        //把原图画到画布上
        canvas.drawRect(rectF, newPaint);
        DecimalFormat decimalFormat = new DecimalFormat(".00");//设置精度为小数点后两位
        radius = result.getWidth() / count;//获取圆的半径
        String s_radius = decimalFormat.format(radius);
        radius = Float.valueOf(s_radius);
        Bitmap layerUnit = getLayerUnit(radius);
        Paint paint = new Paint();
        paint.setAntiAlias(true);
        canvas.drawBitmap(result, 0, 0, paint);
        //从左到右画100
        for (int i = 0; i < count / 3; i++)
        {
            canvas.drawBitmap(layerUnit, i * 3 * radius, 0, paint);
        }
        return result;

    }
	//画图层单元
    public Bitmap getLayerUnit(float radius)
    {
        int width = Math.round(5 * radius);
        int height = Math.round(2 * radius);
        Bitmap temp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(temp);
        Paint circlePaint = new Paint();
        circlePaint.setAntiAlias(true);
        circlePaint.setColor(Color.WHITE);//设置颜色为白色
        canvas.clipRect(radius, radius, 4 * radius, 2 * radius);
        canvas.drawCircle(radius, radius, radius, circlePaint);//画左侧圆
        canvas.drawCircle(4 * radius, radius, radius, circlePaint);//画右侧圆
        Bitmap result = Bitmap.createBitmap(temp, Math.round(radius), Math.round(radius), Math.round(3 * radius), Math.round(radius));//裁剪需要的部分
        return result;
    }

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

    }
}