PdfDevice class abstract interface

Rendering target. The interpreter walks a content stream and emits these callbacks; implementations include the Flutter Canvas device, a text-extraction device, and test recorders.

Implementers

Properties

hashCode → int
The hash code for this object.
no setterinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

beginGroup(double alpha, {bool knockout = false}) → void
Brackets a transparency-group form (§11.6.6) whose composite result paints at alpha. Inside the group, alpha starts over at 1.0; the group then blends as one object. Non-compositing devices can treat the pair as a no-op - the group's content still arrives through the normal callbacks in between.
beginSoftMasked() → void
Starts capturing painted content that an ExtGState /SMask will mask. Visual devices open an offscreen layer; others can ignore the pair.
clipPath(PdfPath path, PdfFillRule rule) → void
Intersects the current clip with path.
drawImage(PdfImageRequest request) → void
drawText(PdfTextRun run) → void
endGroup() → void
Composites the group opened by beginGroup.
endSoftMasked({required bool luminosity, required PdfRect backdrop, required void drawMask(), double backdropLuminance = 0, double transferScale = 1, double transferOffset = 0}) → void
Ends the capture opened by beginSoftMasked. drawMask paints the mask group's content through this same device; for luminosity masks the device converts the result's luminance to alpha over the backdrop box, then composites it into the captured content (dstIn). Areas the mask group doesn't paint take backdropLuminance (the luminance of the /BC backdrop colour, default black). The mask value is remapped through the /TR transfer function, linearised here as value * transferScale + transferOffset (identity by default). Devices that collect content from drawMask (e.g. image collectors) should invoke it even if they do no compositing.
fillMesh(PdfMesh mesh, double alpha) → void
Paints a Gouraud triangle mesh (mesh shadings, types 4–7). Vertices arrive in page space. Non-painting devices can ignore it; simple devices may fall back to PdfMesh.averageColor.
fillPath(PdfPath path, PdfColor color, PdfFillRule rule, double alpha) → void
fillPathGradient(PdfPath path, PdfFillRule rule, PdfGradient gradient, double alpha) → void
Fills with a gradient (axial/radial shading patterns and sh). Non-painting devices can ignore it; simple devices may fall back to fillPath with PdfGradient.averageColor.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
restore() → void
Mirrors Q.
save() → void
Mirrors q. Saved state must include the clip.
setBlendMode(PdfBlendMode mode) → void
Sets the blend mode for subsequent painting (gs /BM). Non-compositing devices can ignore it.
strokePath(PdfPath path, PdfColor color, PdfStroke stroke, double alpha) → void
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited