awaforge

pdfShadingTyped

AGPL-3.0-onlyRelease 2L4

Typed Shading dicts (§8.7.4) and Function dicts (§7.10) — ISO 32000-2.

Module pdfShadingTyped | Source packages/front/office/pdf/src/extra/shading-typed.js | Deps pdfErrors, pdfParserObj | Worker-safe yes

Shadings 1–7 (Function-based, Axial, Radial, Free-form Gouraud, Lattice-form Gouraud, Coons patch mesh, Tensor-product patch mesh). Functions 0/2/3/4 (Sampled, Exponential, Stitching, PostScript).

Resolve

const ext = runtime.resolve('pdfShadingTyped');
// Returns: { typeShading, typeFunction }

API

Member Signature Returns
typeShading (dict|stream) => Shading Record shaped by /ShadingType.
typeFunction (dict|stream) => Function Record shaped by /FunctionType.

Examples

Axial shading

const ext = runtime.resolve('pdfShadingTyped');
const sh = ext.typeShading(shadingDict);
sh.shadingType;  // 2
sh.coords;       // [x0, y0, x1, y1]
sh.function;     // raw /Function entry

Stitching function

const fn = ext.typeFunction(fnDict);
fn.functionType;  // 3
fn.functions;     // array of sub-function entries
fn.bounds;        // [...]

Errors

Code Class When
pdf/extra/shading/not-dict-or-stream ParseError Invalid input.
pdf/extra/shading/missing-type ParseError /ShadingType absent.
pdf/extra/shading/bad-type ParseError /ShadingType outside 1..7.
pdf/extra/shading/lattice-missing-vpr ParseError Type 5 without /VerticesPerRow.
pdf/extra/shading/mesh-missing-bits ParseError Type 4/6/7 without /BitsPerCoordinate//BitsPerComponent.
pdf/extra/shading/mesh-missing-decode ParseError /Decode absent.
pdf/extra/shading/mesh-missing-flag ParseError /BitsPerFlag absent (Type 4/6/7).
pdf/extra/shading/bad-coords ParseError /Coords malformed.
pdf/extra/function/not-dict-or-stream ParseError Invalid input.
pdf/extra/function/missing-type ParseError /FunctionType absent.
pdf/extra/function/bad-type ParseError /FunctionType outside {0,2,3,4}.

See also