Gamma

Gamma filter class

Example

const filter = new Gamma({
  gamma: [1, 0.5, 2.1]
});
object.filters.push(filter);
object.applyFilters();

Extends

BaseFilter<typeof GAMMA, GammaOwnProps>

Constructors

new Gamma()

new Gamma(options): Gamma

Defined in: src/filters/Gamma.ts:50

Parameters

options

gamma

GammaInput

Returns

Gamma

Overrides

BaseFilter.constructor

Properties

gamma

gamma: GammaInput

Defined in: src/filters/Gamma.ts:33

Gamma array value, from 0.01 to 2.2.

Param

Default

rgbValues?

optional rgbValues: object

Defined in: src/filters/Gamma.ts:34

b

b: Uint8Array

g

g: Uint8Array

r

r: Uint8Array

defaults

static defaults: GammaOwnProps = gammaDefaultValues

Defined in: src/filters/Gamma.ts:42

Overrides

BaseFilter.defaults

type

static type: "Gamma" = GAMMA

Defined in: src/filters/Gamma.ts:40

The class type. Used to identify which class this is. This is used for serialization purposes and internally it can be used to identify classes. As a developer you could use instance of Class but to avoid importing all the code and blocking tree shaking we try to avoid doing that.

Overrides

BaseFilter.type

uniformLocations

static uniformLocations: string[]

Defined in: src/filters/Gamma.ts:44

Contains the uniform locations for the fragment shader. uStepW and uStepH are handled by the BaseFilter, each filter class needs to specify all the one that are needed

Overrides

BaseFilter.uniformLocations

Accessors

type

Get Signature

get type(): Name

Defined in: src/filters/BaseFilter.ts:31

Filter type

Default

Returns

Name

Inherited from

BaseFilter.type

Methods

_setupFrameBuffer()

_setupFrameBuffer(options): void

Defined in: src/filters/BaseFilter.ts:205

Parameters

options

TWebGLPipelineState

Returns

void

Inherited from

BaseFilter._setupFrameBuffer

_swapTextures()

_swapTextures(options): void

Defined in: src/filters/BaseFilter.ts:232

Parameters

options

TWebGLPipelineState

Returns

void

Inherited from

BaseFilter._swapTextures

applyTo()

applyTo(options): void

Defined in: src/filters/BaseFilter.ts:265

Apply this filter to the input image data provided.

Determines whether to use WebGL or Canvas2D based on the options.webgl flag.

Parameters

options

TWebGLPipelineState | T2DPipelineState

Returns

void

Inherited from

BaseFilter.applyTo

applyTo2d()

applyTo2d(options): void

Defined in: src/filters/Gamma.ts:65

Apply the Gamma operation to a Uint8Array representing the pixels of an image.

Parameters

options

T2DPipelineState

Returns

void

Overrides

BaseFilter.applyTo2d

applyToWebGL()

applyToWebGL(options): void

Defined in: src/filters/BaseFilter.ts:315

Apply this filter using webgl.

Parameters

options

TWebGLPipelineState

Returns

void

Inherited from

BaseFilter.applyToWebGL

bindAdditionalTexture()

bindAdditionalTexture(gl, texture, textureUnit): void

Defined in: src/filters/BaseFilter.ts:334

Parameters

gl

WebGLRenderingContext

texture

WebGLTexture

textureUnit

number

Returns

void

Inherited from

BaseFilter.bindAdditionalTexture

createHelpLayer()

createHelpLayer(options): void

Defined in: src/filters/BaseFilter.ts:370

If needed by a 2d filter, this functions can create an helper canvas to be used remember that options.targetCanvas is available for use till end of chain.

Parameters

options

T2DPipelineState

Returns

void

Inherited from

BaseFilter.createHelpLayer

createProgram()

createProgram(gl, fragmentSource, vertexSource): object

Defined in: src/filters/BaseFilter.ts:83

Compile this filter’s shader program.

Parameters

gl

WebGLRenderingContext

The GL canvas context to use for shader compilation.

fragmentSource

string = ...

fragmentShader source for compilation

vertexSource

string = ...

vertexShader source for compilation

Returns

object

attributeLocations

attributeLocations: TWebGLAttributeLocationMap

program

program: WebGLProgram

uniformLocations

uniformLocations: TWebGLUniformLocationMap

Inherited from

BaseFilter.createProgram

getAttributeLocations()

getAttributeLocations(gl, program): TWebGLAttributeLocationMap

Defined in: src/filters/BaseFilter.ts:153

Return a map of attribute names to WebGLAttributeLocation objects.

Parameters

gl

WebGLRenderingContext

The canvas context used to compile the shader program.

program

WebGLProgram

The shader program from which to take attribute locations.

Returns

TWebGLAttributeLocationMap

A map of attribute names to attribute locations.

Inherited from

BaseFilter.getAttributeLocations

getCacheKey()

getCacheKey(): string

Defined in: src/filters/BaseFilter.ts:284

Returns a string that represent the current selected shader code for the filter. Used to force recompilation when parameters change or to retrieve the shader from cache

Returns

string

Inherited from

BaseFilter.getCacheKey

getFragmentSource()

getFragmentSource(): string

Defined in: src/filters/Gamma.ts:46

Returns

string

Overrides

BaseFilter.getFragmentSource

getUniformLocations()

getUniformLocations(gl, program): TWebGLUniformLocationMap

Defined in: src/filters/BaseFilter.ts:169

Return a map of uniform names to WebGLUniformLocation objects.

Parameters

gl

WebGLRenderingContext

The canvas context used to compile the shader program.

program

WebGLProgram

The shader program from which to take uniform locations.

Returns

TWebGLUniformLocationMap

A map of uniform names to uniform locations.

Inherited from

BaseFilter.getUniformLocations

getVertexSource()

getVertexSource(): string

Defined in: src/filters/BaseFilter.ts:72

Returns

string

Inherited from

BaseFilter.getVertexSource

isNeutralState()

isNeutralState(): boolean

Defined in: src/filters/Gamma.ts:107

Generic isNeutral implementation for one parameter based filters. Used only in image applyFilters to discard filters that will not have an effect on the image Other filters may need their own version ( ColorMatrix, HueRotation, gamma, ComposedFilter )