直接上源码↓↓↓

/**

* Sets the {@link ImageView} the resource will be loaded into, cancels any existing loads into

* the view, and frees any resources Glide may have previously loaded into the view so they may be

* reused.

*

* @see RequestManager#clear(Target)

*

* @param view The view to cancel previous loads for and load the new resource into.

* @return The

* {@link com.bumptech.glide.request.target.Target} used to wrap the given {@link ImageView}.

*/

@NonNull

public ViewTarget into(@NonNull ImageView view) {

Util.assertMainThread();

Preconditions.checkNotNull(view);

RequestOptions requestOptions = this.requestOptions;

if (!requestOptions.isTransformationSet()

&& requestOptions.isTransformationAllowed()

&& view.getScaleType() != null) {

// Clone in this method so that if we use this RequestBuilder to load into a View and then

// into a different target, we don't retain the transformation applied based on the previous

// View's scale type.

switch (view.getScaleType()) {

case CENTER_CROP:

requestOptions = requestOptions.clone().optionalCenterCrop();

break;

case CENTER_INSIDE:

requestOptions = requestOptions.clone().optionalCenterInside();

break;

case FIT_CENTER:

case FIT_START:

case FIT_END:

requestOptions = requestOptions.clone().optionalFitCenter();

break;

case FIT_XY:

requestOptions = requestOptions.clone().optionalCenterInside();

break;

case CENTER:

case MATRIX:

default:

// Do nothing.

}

}

return into(

glideContext.buildImageViewTarget(view, transcodeClass),

/*targetListener=*/ null,

requestOptions);

}

可以发现如果requestOption中没有设置过transformation或dontTransform，最后通过