Package com.bumptech.glide.load.resource.bitmap

Class BitmapDrawableDecoder<DataType>

java.lang.Object

com.bumptech.glide.load.resource.bitmap.BitmapDrawableDecoder<DataType>

Type Parameters:

DataType - The type of data that will be decoded.

All Implemented Interfaces:

ResourceDecoder<DataType,BitmapDrawable>

public class BitmapDrawableDecoder<DataType>
extends Object
implements ResourceDecoder<DataType,BitmapDrawable>

Decodes an BitmapDrawable for a data type.

Constructor Summary

Constructors

Constructor	Description
BitmapDrawableDecoder(Context context, ResourceDecoder<DataType,Bitmap> decoder)
BitmapDrawableDecoder(Resources resources, BitmapPool bitmapPool, ResourceDecoder<DataType,Bitmap> decoder)	Deprecated. Use BitmapDrawableDecoder(Context, ResourceDecoder), bitmapPool is ignored.
BitmapDrawableDecoder(Resources resources, ResourceDecoder<DataType,Bitmap> decoder)

Method Summary

Modifier and Type	Method	Description
Resource<BitmapDrawable>	decode(DataType source, int width, int height, Options options)	Returns a decoded resource from the given data or null if no resource could be decoded.
boolean	handles(DataType source, Options options)	Returns true if this decoder is capable of decoding the given source with the given options, and false otherwise.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

BitmapDrawableDecoder

public BitmapDrawableDecoder(Context context,
 ResourceDecoder<DataType,Bitmap> decoder)

BitmapDrawableDecoder

@Deprecated
public BitmapDrawableDecoder(Resources resources,
 BitmapPool bitmapPool,
 ResourceDecoder<DataType,Bitmap> decoder)

Deprecated.

Use BitmapDrawableDecoder(Context, ResourceDecoder), bitmapPool is ignored.

BitmapDrawableDecoder

public BitmapDrawableDecoder(@NonNull
 Resources resources,
 @NonNull
 ResourceDecoder<DataType,Bitmap> decoder)

Method Details

handles

public boolean handles(@NonNull
 DataType source,
 @NonNull
 Options options)
                throws IOException

Description copied from interface: ResourceDecoder

Returns true if this decoder is capable of decoding the given source with the given options, and false otherwise.

Decoders should make a best effort attempt to quickly determine if they are likely to be able to decode data, but should not attempt to completely read the given data. A typical implementation would check the file headers verify they match content the decoder expects to handle (i.e. a GIF decoder should verify that the image contains the GIF header block.

Decoders that return true from handles may still return null from ResourceDecoder.decode(Object, int, int, Options) if the data is partial or formatted incorrectly.

Specified by:

handles in interface ResourceDecoder<DataType,BitmapDrawable>

Throws:

IOException

decode

public Resource<BitmapDrawable> decode(@NonNull
 DataType source,
 int width,
 int height,
 @NonNull
 Options options)
                                throws IOException

Description copied from interface: ResourceDecoder

Returns a decoded resource from the given data or null if no resource could be decoded.

The source is managed by the caller, there's no need to close it. The returned Resource will be released when the engine sees fit.

Note - The width and height arguments are hints only, there is no requirement that the decoded resource exactly match the given dimensions. A typical use case would be to use the target dimensions to determine how much to downsample Bitmaps by to avoid overly large allocations.

Specified by:

decode in interface ResourceDecoder<DataType,BitmapDrawable>

Parameters:

source - The data the resource should be decoded from.

width - The ideal width in pixels of the decoded resource, or Target.SIZE_ORIGINAL to indicate the original resource width.

height - The ideal height in pixels of the decoded resource, or Target.SIZE_ORIGINAL to indicate the original resource height.

options - A map of string keys to objects that may or may not contain options available to this particular implementation. Implementations should not assume that any or all of their option keys are present. However, implementations may assume that if one of their option keys is present, it's value is non-null and is of the expected type.

Throws:

IOException - typically only if the source (InputStream, ParcelFileDescriptor etc) throws while being read.