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Merge pull request #21041 from timvandermeij/function-type-enumeration

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Introduce a function type enumeration
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calixteman 2026-04-04 19:55:46 +02:00 committed by GitHub
commit 345329e490
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3 changed files with 17 additions and 12 deletions
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4
src/core/document.js
View File

@ -60,6 +60,7 @@ import {
RefSet,
RefSetCache,
} from "./primitives.js";
import { FunctionType, PDFFunctionFactory } from "./function.js";
import { getXfaFontDict, getXfaFontName } from "./xfa_fonts.js";
import { NullStream, Stream } from "./stream.js";
import { BaseStream } from "./base_stream.js";
@ -73,7 +74,6 @@ import { LocalColorSpaceCache } from "./image_utils.js";
import { ObjectLoader } from "./object_loader.js";
import { OperatorList } from "./operator_list.js";
import { PartialEvaluator } from "./evaluator.js";
import { PDFFunctionFactory } from "./function.js";
import { PDFImage } from "./image.js";
import { StreamsSequenceStream } from "./decode_stream.js";
import { StructTreePage } from "./struct_tree.js";
@ -2131,7 +2131,7 @@ class PDFDocument {
return obj;
}
if (dict.get("FunctionType") === 4) {
if (dict.get("FunctionType") === FunctionType.POSTSCRIPT_CALCULATOR) {
const source = value.getString();
value.reset();
const domain = dict.get("Domain") ?? [];

21
src/core/function.js
View File

@ -22,6 +22,13 @@ import { isNumberArray } from "./core_utils.js";
import { LocalFunctionCache } from "./image_utils.js";
import { MathClamp } from "../shared/math_clamp.js";
const FunctionType = {
SAMPLED: 0,
EXPONENTIAL_INTERPOLATION: 2,
STITCHING: 3,
POSTSCRIPT_CALCULATOR: 4,
};
class PDFFunctionFactory {
static #useWasm = true;
@ -126,18 +133,16 @@ class PDFFunction {
const typeNum = dict.get("FunctionType");
switch (typeNum) {
case 0:
case FunctionType.SAMPLED:
return this.constructSampled(factory, fn, dict);
case 1:
break;
case 2:
case FunctionType.EXPONENTIAL_INTERPOLATION:
return this.constructInterpolated(factory, dict);
case 3:
case FunctionType.STITCHING:
return this.constructStiched(factory, dict);
case 4:
case FunctionType.POSTSCRIPT_CALCULATOR:
return this.constructPostScript(factory, fn, dict);
}
throw new FormatError("Unknown type of function");
throw new FormatError(`Unknown function type: ${typeNum}`);
}
static parseArray(factory, fnObj) {
@ -391,4 +396,4 @@ function isPDFFunction(v) {
return fnDict.has("FunctionType");
}
export { isPDFFunction, PDFFunctionFactory };
export { FunctionType, isPDFFunction, PDFFunctionFactory };

4
test/unit/colorspace_spec.js
View File

@ -14,6 +14,7 @@
*/
import { Dict, Name, Ref } from "../../src/core/primitives.js";
import { FunctionType, PDFFunctionFactory } from "../../src/core/function.js";
import {
GlobalColorSpaceCache,
LocalColorSpaceCache,
@ -21,7 +22,6 @@ import {
import { Stream, StringStream } from "../../src/core/stream.js";
import { ColorSpace } from "../../src/core/colorspace.js";
import { ColorSpaceUtils } from "../../src/core/colorspace_utils.js";
import { PDFFunctionFactory } from "../../src/core/function.js";
import { XRefMock } from "./test_utils.js";
describe("colorspace", function () {
@ -836,7 +836,7 @@ describe("colorspace", function () {
it("should handle the case when cs is an array", function () {
const fnDict = new Dict();
fnDict.set("FunctionType", 4);
fnDict.set("FunctionType", FunctionType.POSTSCRIPT_CALCULATOR);
fnDict.set("Domain", [0.0, 1.0]);
fnDict.set("Range", [0.0, 1.0, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0]);
fnDict.set("Length", 58);