OffscreenCanvasRenderingContext2D extension type

The OffscreenCanvasRenderingContext2D interface is a CanvasRenderingContext2D rendering context for drawing to the bitmap of an OffscreenCanvas object. It is similar to the CanvasRenderingContext2D object, with the following differences:

• there is no support for user-interface features (drawFocusIfNeeded, and scrollPathIntoView)
• its canvas attribute refers to an OffscreenCanvas object rather than a canvas element
• it has a commit() method for pushing rendered images to the context's OffscreenCanvas object's placeholder canvas element

on

• JSObject

Implemented types

• JSObject

Properties

canvas → OffscreenCanvas

no setter

direction ↔ CanvasDirection

getter/setter pair

fillStyle ↔ JSAny

getter/setter pair

filter ↔ String

getter/setter pair

font ↔ String

getter/setter pair

fontKerning ↔ CanvasFontKerning

getter/setter pair

fontStretch ↔ CanvasFontStretch

getter/setter pair

fontVariantCaps ↔ CanvasFontVariantCaps

getter/setter pair

globalAlpha ↔ num

getter/setter pair

globalCompositeOperation ↔ String

getter/setter pair

hashCode → int

The hash code for this object.

no setter, inherited

imageSmoothingEnabled ↔ bool

getter/setter pair

imageSmoothingQuality ↔ ImageSmoothingQuality

getter/setter pair

letterSpacing ↔ String

getter/setter pair

lineCap ↔ CanvasLineCap

getter/setter pair

lineDashOffset ↔ num

getter/setter pair

lineJoin ↔ CanvasLineJoin

getter/setter pair

lineWidth ↔ num

getter/setter pair

miterLimit ↔ num

getter/setter pair

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

shadowBlur ↔ num

getter/setter pair

shadowColor ↔ String

getter/setter pair

shadowOffsetX ↔ num

getter/setter pair

shadowOffsetY ↔ num

getter/setter pair

strokeStyle ↔ JSAny

getter/setter pair

textAlign ↔ CanvasTextAlign

getter/setter pair

textBaseline ↔ CanvasTextBaseline

getter/setter pair

textRendering ↔ CanvasTextRendering

getter/setter pair

wordSpacing ↔ String

getter/setter pair

Methods

arc(num x, num y, num radius, num startAngle, num endAngle, [bool counterclockwise]) → void

arcTo(num x1, num y1, num x2, num y2, num radius) → void

beginPath() → void

bezierCurveTo(num cp1x, num cp1y, num cp2x, num cp2y, num x, num y) → void

clearRect(num x, num y, num w, num h) → void

clip([JSAny fillRuleOrPath, CanvasFillRule fillRule]) → void

closePath() → void

commit() → void

The OffscreenCanvasRenderingContext2D.commit() method of the Canvas 2D API copies the rendering context's bitmap to the bitmap of the placeholder canvas element of the associated OffscreenCanvas object. The copy operation is synchronous. Calling this method is not needed for the transfer, since it happens automatically during the event-loop execution.

createConicGradient(num startAngle, num x, num y) → CanvasGradient

createImageData(JSAny imagedataOrSw, [int sh, ImageDataSettings settings]) → ImageData

createLinearGradient(num x0, num y0, num x1, num y1) → CanvasGradient

createPattern(CanvasImageSource image, String repetition) → CanvasPattern?

createRadialGradient(num x0, num y0, num r0, num x1, num y1, num r1) → CanvasGradient

drawImage(CanvasImageSource image, num dxOrSx, num dyOrSy, [num dwOrSw, num dhOrSh, num dx, num dy, num dw, num dh]) → void

ellipse(num x, num y, num radiusX, num radiusY, num rotation, num startAngle, num endAngle, [bool counterclockwise]) → void

fill([JSAny fillRuleOrPath, CanvasFillRule fillRule]) → void

fillRect(num x, num y, num w, num h) → void

fillText(String text, num x, num y, [num maxWidth]) → void

getImageData(int sx, int sy, int sw, int sh, [ImageDataSettings settings]) → ImageData

getLineDash() → JSArray<JSNumber>

getTransform() → DOMMatrix

isContextLost() → bool

isPointInPath(JSAny pathOrX, num xOrY, [JSAny fillRuleOrY, CanvasFillRule fillRule]) → bool

isPointInStroke(JSAny pathOrX, num xOrY, [num y]) → bool

lineTo(num x, num y) → void

measureText(String text) → TextMetrics

moveTo(num x, num y) → void

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

putImageData(ImageData imagedata, int dx, int dy, [int dirtyX, int dirtyY, int dirtyWidth, int dirtyHeight]) → void

quadraticCurveTo(num cpx, num cpy, num x, num y) → void

rect(num x, num y, num w, num h) → void

reset() → void

resetTransform() → void

restore() → void

rotate(num angle) → void

roundRect(num x, num y, num w, num h, [JSAny radii]) → void

save() → void

scale(num x, num y) → void

setLineDash(JSArray<JSNumber> segments) → void

setTransform([JSAny aOrTransform, num b, num c, num d, num e, num f]) → void

stroke([Path2D path]) → void

strokeRect(num x, num y, num w, num h) → void

strokeText(String text, num x, num y, [num maxWidth]) → void

toString() → String

A string representation of this object.

inherited

transform(num a, num b, num c, num d, num e, num f) → void

translate(num x, num y) → void

Operators

operator ==(Object other) → bool

The equality operator.

inherited