PixaProcessors class abstract final

Helpers for building stable runtime processor descriptors.

Pixa keeps processor descriptors as strings so cache keys remain compact and stable across Dart and Rust. These helpers avoid typo-prone user code while preserving the same runtime pipeline.

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Static Methods

blur(double sigma) → String

Applies a Gaussian blur. Range: 0..128.

brighten(int value) → String

Adds value to every color channel. Range: -255..255.

contrast(double value) → String

Adjusts contrast by value. Range: -255..255.

crop({required int x, required int y, required int width, required int height}) → String

Crops a rectangle from the image.

fastBlur(double sigma) → String

Applies a faster approximate Gaussian blur. Range: 0..128.

filter3x3(List<double> kernel) → String

Applies a bounded 3x3 convolution kernel. Each value range: -64..64.

flipHorizontal() → String

Mirrors pixels horizontally.

flipVertical() → String

Mirrors pixels vertically.

grayscale() → String

Converts pixels to grayscale.

hueRotate(int degrees) → String

Rotates hue by degrees. Range: -360..360.

invert() → String

Inverts color channels while preserving alpha.

resize({int? width, int? height, PixaResizeMode mode = PixaResizeMode.fit, PixaResizeFilter filter = PixaResizeFilter.lanczos3}) → String

Resizes an image. At least one of width or height is required.

resizeExact(int width, int height, {PixaResizeFilter filter = PixaResizeFilter.lanczos3}) → String

Resizes an image to an exact width and height.

resizeToFill(int width, int height, {PixaResizeFilter filter = PixaResizeFilter.lanczos3}) → String

Resizes to fill width x height, cropping from the center if needed.

rotate(int degrees) → String

Rotates by 0, 90, 180, or 270 degrees.

thumbnail(int width, int height) → String

Builds a fast aspect-fit thumbnail that never enlarges the source image.

thumbnailExact(int width, int height) → String

Builds a fast thumbnail with exact output dimensions.

tileCropResize({required int x, required int y, required int width, required int height, required int decodedWidth, required int decodedHeight, PixaResizeFilter filter = PixaResizeFilter.lanczos3}) → String

Crops a source tile and resizes it to decoded tile dimensions.

unsharpen({required double sigma, required int threshold}) → String

Applies an unsharp mask. sigma range: 0..128, threshold range: 0..255.