PngDecoder class

Decode a PNG encoded image.

Inheritance

• Object
• Decoder
• PngDecoder

Constructors

PngDecoder()

Properties

hashCode → int

The hash code for this object.

no setter, inherited

info → PngInfo?

no setter

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

decodeAnimation(List<int> bytes) → Animation?

Decode all of the frames from an animation. If the file is not an animation, a single frame animation is returned. If there was a problem decoding the file, null is returned.

override

decodeFrame(int frame) → Image?

Decode the frame (assuming startDecode has already been called).

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> data) → bool

Is the given file a valid PNG image?

override

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

numFrames() → int

The number of frames that can be decoded.

override

startDecode(List<int> data) → DecodeInfo?

Start decoding the data as an animation sequence, but don't actually process the frames until they are requested with decodeFrame.

override

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Constants

FILTER_AVERAGE → const int

FILTER_NONE → const int

FILTER_PAETH → const int

FILTER_SUB → const int

FILTER_UP → const int

GRAYSCALE → const int

GRAYSCALE_ALPHA → const int

INDEXED → const int

RGB → const int

RGBA → const int