Glide set fillet image (support custom fillet position)

There is a need to display data in recent projects , Fillet the leftmost picture in the parent control , At this point, the right angle of the displayed picture covers the fillet of the parent control , Therefore, it is necessary to fillet the picture before displaying .

On the Internet, most of them are realized through Transformation, stay transform Method , Then I found out Glide The built-in settings in the circular picture RoundedCorners class , Learn from this kind of information that can be provided officially TransformationUtils Tool class to implement , The specific implementation is as follows ：

public class RoundRadiusTransform extends BitmapTransformation {

//   The full path of the actual class is used here 
    private static final String ID = "com.xxx.xxx.xxxx.xxx.RoundRadiusTransform";
    private static final byte[] ID_BYTES = ID.getBytes(CHARSET);

    private final int roundingRadius;

    private boolean isLeftTop, isRightTop, isLeftBottom, isRightBottom;

    private static RoundRadiusTransform mInstance;

    public RoundRadiusTransform(int roundingRadius) {
        this.roundingRadius = roundingRadius;
    }

    /**
     *  The part where the fillet needs to be set 
     *
     * @param leftTop      top left corner 
     * @param rightTop     Upper right corner 
     * @param leftBottom   The lower left corner 
     * @param rightBottom  The lower right corner 
     */
    public void setNeedCorner(boolean leftTop, boolean rightTop, boolean leftBottom, boolean rightBottom) {
        isLeftTop = leftTop;
        isRightTop = rightTop;
        isLeftBottom = leftBottom;
        isRightBottom = rightBottom;
    }

    @Override
    protected Bitmap transform(@NonNull BitmapPool pool, @NonNull Bitmap toTransform, int outWidth, int outHeight) {
        return TransformationUtils.roundedCorners(pool, toTransform,
                isLeftTop ? roundingRadius : 0,
                isRightTop ? roundingRadius : 0,
                isRightBottom ? roundingRadius : 0,
                isLeftBottom ? roundingRadius : 0);
    }

    public static RoundRadiusTransform getDefault() {
        if (mInstance == null) {
            synchronized (RoundRadiusTransform.class) {
                if (mInstance == null) {
                    mInstance = new RoundRadiusTransform(ScreenUtils.dp2px(MainApplication.getInstance(), 6));
                    mInstance.setNeedCorner(true, false, true, false);
                }
            }
        }
        return mInstance;
    }

    @Override
    public boolean equals(Object o) {
        if (o instanceof RoundRadiusTransform) {
            RoundRadiusTransform other = (RoundRadiusTransform) o;
            return roundingRadius == other.roundingRadius;
        }
        return false;
    }

    @Override
    public int hashCode() {
        return Util.hashCode(ID.hashCode(), Util.hashCode(roundingRadius));
    }

    @Override
    public void updateDiskCacheKey(@NonNull MessageDigest messageDigest) {
        messageDigest.update(ID_BYTES);

        byte[] radiusData = ByteBuffer.allocate(4).putInt(roundingRadius).array();
        messageDigest.update(radiusData);
    }
}

The default setting in the above example is left 6dp The display style of the right angle of the fillet . If you read it RoundedCorners Source code , You will find that there are great similarities , It's just transform Method returns differently .

So sometimes there's no need to reinvent the wheel , Some wheel parts are in tools provided by third parties , All we need is to take some time to understand the group and spell it out .