GifDecoder class

A decoder for the GIF image format. This supports both single frame and animated GIF files, and transparency.

Inheritance

Constructors

GifDecoder([List<int>? bytes])

Properties

hashCode → int
The hash code for this object.
no setterinherited
info ↔ GifInfo?
getter/setter pair
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

decodeAnimation(List<int> bytes) → Animation?
Decode all of the frames of an animated gif. For single image gifs, this will return an animation with a single frame.
override
decodeFrame(int frame) → Image?
Decode a single frame from the data that was set with startDecode. If frame is out of the range of available frames, null is returned. Non animated image files will only have frame 0. An Image is returned, which provides the image, and top-left coordinates of the image, as animated frames may only occupy a subset of the canvas.
override
decodeHdrFrame(int frame) → HdrImage?
Decode a single high dynamic range (HDR) frame from the data that was set with startDecode. If the format of the file does not support HDR images, the regular image will be converted to an HDR image as (color / 255). If frame is out of the range of available frames, null is returned. Non animated image files will only have frame 0. An Image is returned, which provides the image, and top-left coordinates of the image, as animated frames may only occupy a subset of the canvas.
inherited
decodeHdrImage(List<int> bytes, {int frame = 0}) → HdrImage?
Decode the file and extract a single High Dynamic Range (HDR) image from it. HDR images are stored in floating-poing values. If the format of the file does not support HDR images, the regular image will be converted to an HDR image as (color / 255). If the file is animated, the specified frame will be decoded. If there was a problem decoding the file, null is returned.
inherited
decodeImage(List<int> bytes, {int frame = 0}) → Image?
Decode the file and extract a single image from it. If the file is animated, the specified frame will be decoded. If there was a problem decoding the file, null is returned.
override
isValidFile(List<int> bytes) → bool
Is the given file a valid Gif image?
override
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
numFrames() → int
How many frames are available to decode?
override
startDecode(List<int> bytes) → GifInfo?
Validate the file is a Gif image and get information about it. If the file is not a valid Gif image, null is returned.
override
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited

Constants

APPLICATION_EXT → const int
CODE_MASKS → const List<int>
EXTENSION_RECORD_TYPE → const int
GIF87_STAMP → const String
GIF89_STAMP → const String
GRAPHIC_CONTROL_EXT → const int
IMAGE_DESC_RECORD_TYPE → const int
INTERLACED_JUMP → const List<int>
INTERLACED_OFFSET → const List<int>
LZ_BITS → const int
LZ_MAX_CODE → const int
NO_SUCH_CODE → const int
STAMP_SIZE → const int
TERMINATE_RECORD_TYPE → const int