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java.lang.Object com.bumptech.glide.load.resource.bitmap.BitmapTransformation
public abstract class BitmapTransformation
A simple Transformation
for transforming Bitmap
s that
abstracts away dealing with Resource
objects for subclasses.
Use cases will look something like this:
public class FillSpace extends BaseBitmapTransformation {
@Override
public Bitmap transform(BitmapPool pool, Bitmap toTransform, int outWidth, int outHeight) {
if (toTransform.getWidth() == outWidth && toTransform.getHeight == outHeight) {
return toTransform;
}
return Bitmap.createScaledBitmap(toTransform, outWidth, outHeight, true);
}
}
Constructor Summary | |
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BitmapTransformation(BitmapPool bitmapPool)
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BitmapTransformation(Context context)
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Method Summary | |
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protected abstract Bitmap |
transform(BitmapPool pool,
Bitmap toTransform,
int outWidth,
int outHeight)
Transforms the given Bitmap based on the given dimensions and returns the transformed
result. |
Resource<Bitmap> |
transform(Resource<Bitmap> resource,
int outWidth,
int outHeight)
Transforms the given resource and returns the transformed resource. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface com.bumptech.glide.load.Transformation |
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getId |
Constructor Detail |
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public BitmapTransformation(Context context)
public BitmapTransformation(BitmapPool bitmapPool)
Method Detail |
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public final Resource<Bitmap> transform(Resource<Bitmap> resource, int outWidth, int outHeight)
Transformation
Note - Transformations should be idempotent so if given a resource that has already been transformed by this transformation, this method must return the given resource object.
Note - If the original resource object is not returned, the original resource will be recycled and it's internal resources may be reused. This means it is not safe to rely on the original resource or any internal state of the original resource in any new resource that is created. Usually this shouldn't occur, but if absolutely necessary either the original resource object can be returned with modified internal state, or the data in the original resource can be copied into the transformed resource.
transform
in interface Transformation<Bitmap>
resource
- The resource to transform.outWidth
- The width of the view or target the resource will be displayed in.outHeight
- The height of the view or target the resource will be displayed in.
protected abstract Bitmap transform(BitmapPool pool, Bitmap toTransform, int outWidth, int outHeight)
Bitmap
based on the given dimensions and returns the transformed
result.
Note - As with all Transformation
s, this method must be idempotent. Given
bitmap A, and bitmap B == transform(A). transform(B) must always equal B.
pool
- A BitmapPool
that can be used to obtain and
return intermediate Bitmap
s used in this transformation. For every
Bitmap
obtained from the pool during this transformation, a
Bitmap
must also be returned.toTransform
- The Bitmap
to transform.outWidth
- The ideal width of the transformed bitmap (does not need to match exactly).outHeight
- The ideal height of the transformed bitmap (does not need to match exactly).
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