PngDecoder class

Decode a PNG encoded image.

Inheritance

Constructors

PngDecoder()

Properties

info PngInfo
read-only
hashCode int
The hash code for this object. [...]
read-only, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited

Methods

decodeAnimation(List<int> data) 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
decodeImage(List<int> data, {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
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
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
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
inherited
toString() String
Returns a string representation of this object.
inherited

Operators

operator ==(dynamic other) bool
The equality operator. [...]
inherited

Constants

FILTER_AVERAGE → const int
3
FILTER_NONE → const int
0
FILTER_PAETH → const int
4
FILTER_SUB → const int
1
FILTER_UP → const int
2
GRAYSCALE → const int
0
GRAYSCALE_ALPHA → const int
4
INDEXED → const int
3
RGB → const int
2
RGBA → const int
6