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Add a parser to get font data from the default appearance (mozilla#12831
) * Add a parser to get font data from the default appearance - pdfium & poppler use a special parser too to get these info. * Update src/core/default_appearance.js Co-authored-by: Jonas Jenwald <[email protected]> Co-authored-by: Jonas Jenwald <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,96 @@ | ||
| /* Copyright 2020 Mozilla Foundation | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| import { isName, Name } from "./primitives.js"; | ||
| import { OPS, warn } from "../shared/util.js"; | ||
| import { ColorSpace } from "./colorspace.js"; | ||
| import { escapePDFName } from "./core_utils.js"; | ||
| import { EvaluatorPreprocessor } from "./evaluator.js"; | ||
| import { StringStream } from "./stream.js"; | ||
|
|
||
| class DefaultAppearanceEvaluator extends EvaluatorPreprocessor { | ||
| constructor(str) { | ||
| super(new StringStream(str)); | ||
| } | ||
|
|
||
| parse() { | ||
| const operation = { | ||
| fn: 0, | ||
| args: [], | ||
| }; | ||
| const result = { | ||
| fontSize: 0, | ||
| fontName: Name.get(""), | ||
| fontColor: new Uint8ClampedArray([0, 0, 0]) /* black */, | ||
| }; | ||
|
|
||
| try { | ||
| while (this.read(operation)) { | ||
| if (this.stateManager.stateStack.length !== 0) { | ||
| // Don't get info in save/restore sections. | ||
| args.length = 0; | ||
| continue; | ||
| } | ||
| const { fn, args } = operation; | ||
| switch (fn | 0) { | ||
| case OPS.setFont: | ||
| const [fontName, fontSize] = args; | ||
| if (isName(fontName)) { | ||
| result.fontName = fontName; | ||
| } | ||
| if (typeof fontSize === "number" && fontSize > 0) { | ||
| result.fontSize = fontSize; | ||
| } | ||
| break; | ||
| case OPS.setFillRGBColor: | ||
| ColorSpace.singletons.rgb.getRgbItem(args, 0, result.fontColor, 0); | ||
| break; | ||
| case OPS.setFillGray: | ||
| ColorSpace.singletons.gray.getRgbItem(args, 0, result.fontColor, 0); | ||
| break; | ||
| case OPS.setFillColorSpace: | ||
| ColorSpace.singletons.cmyk.getRgbItem(args, 0, result.fontColor, 0); | ||
| break; | ||
| } | ||
| args.length = 0; | ||
| } | ||
| } catch (reason) { | ||
| warn(`parseDefaultAppearance - ignoring errors: "${reason}".`); | ||
| } | ||
|
|
||
| return result; | ||
| } | ||
| } | ||
|
|
||
| // Parse DA to extract font and color information. | ||
| function parseDefaultAppearance(str) { | ||
| return new DefaultAppearanceEvaluator(str).parse(); | ||
| } | ||
|
|
||
| // Create default appearance string from some information. | ||
| function createDefaultAppearance({ fontSize, fontName, fontColor }) { | ||
| let colorCmd; | ||
| if (fontColor.every(c => c === 0)) { | ||
| colorCmd = "0 g"; | ||
| } else { | ||
| colorCmd = | ||
| Array.from(fontColor) | ||
| .map(c => (c / 255).toFixed(2)) | ||
| .join(" ") + " rg"; | ||
| } | ||
| return `/${escapePDFName(fontName.name)} ${fontSize} Tf ${colorCmd}`; | ||
| } | ||
|
|
||
| export { createDefaultAppearance, parseDefaultAppearance }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| /* Copyright 2020 Mozilla Foundation | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| import { | ||
| createDefaultAppearance, | ||
| parseDefaultAppearance, | ||
| } from "../../src/core/default_appearance.js"; | ||
| import { Name } from "../../src/core/primitives.js"; | ||
|
|
||
| describe("Default appearance", function () { | ||
| describe("parseDefaultAppearance and createDefaultAppearance", function () { | ||
| it("should parse and create default appearance", function () { | ||
| const da = "/FontName 12 Tf 0.10 0.20 0.30 rg"; | ||
| const result = { | ||
| fontSize: 12, | ||
| fontName: Name.get("FontName"), | ||
| fontColor: new Uint8ClampedArray([26, 51, 76]), | ||
| }; | ||
| expect(parseDefaultAppearance(da)).toEqual(result); | ||
| expect(createDefaultAppearance(result)).toEqual(da); | ||
|
|
||
| expect( | ||
| parseDefaultAppearance( | ||
| " 0.1 0.2 0.3 rg /FontName 12 Tf 0.3 0.2 0.1 rg /NameFont 13 Tf" | ||
| ) | ||
| ).toEqual({ | ||
| fontSize: 13, | ||
| fontName: Name.get("NameFont"), | ||
| fontColor: new Uint8ClampedArray([76, 51, 26]), | ||
| }); | ||
| }); | ||
|
|
||
| it("should parse default appearance with save/restore", function () { | ||
| const da = | ||
| "0.10 0.20 0.30 rg /FontName 12 Tf q 0.30 0.20 0.10 rg /NameFont 13 Tf Q"; | ||
| expect(parseDefaultAppearance(da)).toEqual({ | ||
| fontSize: 12, | ||
| fontName: Name.get("FontName"), | ||
| fontColor: new Uint8ClampedArray([26, 51, 76]), | ||
| }); | ||
| }); | ||
| }); | ||
| }); |
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