PackedBitmapEncoder class final
Encodes a bitmap to a compact (packed) binary format.
For a given buffer, PixelFormat.zero is encoded as 0, and any other
value is encoded as 1. 32 values are packed into a single byte, with the
least significant bit representing the first value. The first two 32-bit
words of the output are the width and height of the bitmap, respectively.
For example, a 128x128 bitmap, which normally would require 2048 bytes, can be encoded into 256 bytes (128 * 128 / 32), or a 8x reduction in size, at the cost of some overhead to pack and unpack the data.
A singleton instance of this class is available as packedBitmapEncoder.
- Inheritance
-
- Object
- Converter<
Buffer< int> , Uint32List> - PackedBitmapEncoder
Properties
- hashCode → int
-
The hash code for this object.
no setterinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
bind(
Stream< Buffer< stream) → Stream<int> >Uint32List> -
Transforms the provided
stream.inherited -
cast<
RS, RT> () → Converter< RS, RT> -
Provides a
Converter<RS, RT>view of this stream transformer.inherited -
convert(
Buffer< int> input) → Uint32List -
Converts
inputand returns the result of the conversion.override -
fuse<
TT> (Converter< Uint32List, TT> other) → Converter<Buffer< int> , TT> -
Fuses
thiswithother.inherited -
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
startChunkedConversion(
Sink< Uint32List> sink) → Sink<Buffer< int> > -
Starts a chunked conversion.
inherited
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited