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Add a parser to get font data from the default appearance (#12831)

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* 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 <jonas.jenwald@gmail.com>

Co-authored-by: Jonas Jenwald <jonas.jenwald@gmail.com>
This commit is contained in:
calixteman 2021-01-21 11:15:31 -08:00 • committed by GitHub
parent 4142001fc2
commit 1039698697
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GPG key ID: 4AEE18F83AFDEB23
7 changed files with 191 additions and 33 deletions
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55
src/core/annotation.js
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@ -35,6 +35,10 @@ import {
} from "../shared/util.js";
import { Catalog, FileSpec, ObjectLoader } from "./obj.js";
import { collectActions, getInheritableProperty } from "./core_utils.js";
import {
createDefaultAppearance,
parseDefaultAppearance,
} from "./default_appearance.js";
import { Dict, isDict, isName, isRef, isStream, Name } from "./primitives.js";
import { ColorSpace } from "./colorspace.js";
import { OperatorList } from "./operator_list.js";
@ -993,6 +997,10 @@ class WidgetAnnotation extends Annotation {
data.defaultAppearance = isString(defaultAppearance)
? defaultAppearance
: "";
this._defaultAppearanceData = parseDefaultAppearance(
data.defaultAppearance
);
const fieldType = getInheritableProperty({ dict, key: "FT" });
data.fieldType = isName(fieldType) ? fieldType.name : null;
@ -1288,12 +1296,14 @@ class WidgetAnnotation extends Annotation {
// Doing so prevents exceptions and allows saving/printing
// the file as expected.
this.data.defaultAppearance = "/Helvetica 0 Tf 0 g";
this._defaultAppearanceData = parseDefaultAppearance(
this.data.defaultAppearance
);
}
const fontInfo = await this._getFontData(evaluator, task);
const [font, fontName] = fontInfo;
const fontSize = this._computeFontSize(...fontInfo, totalHeight);
this._fontName = fontName;
const font = await this._getFontData(evaluator, task);
const fontSize = this._computeFontSize(font, totalHeight);
this._fontName = this._defaultAppearanceData.fontName.name;
let descent = font.descent;
if (isNaN(descent)) {
@ -1364,27 +1374,30 @@ class WidgetAnnotation extends Annotation {
async _getFontData(evaluator, task) {
const operatorList = new OperatorList();
const initialState = {
fontSize: 0,
font: null,
fontName: null,
clone() {
return this;
},
};
await evaluator.getOperatorList({
stream: new StringStream(this.data.defaultAppearance),
task,
resources: this._fieldResources.mergedResources,
const { fontName, fontSize } = this._defaultAppearanceData;
await evaluator.handleSetFont(
this._fieldResources.mergedResources,
[fontName, fontSize],
/* fontRef = */ null,
operatorList,
task,
initialState,
});
/* fallbackFontDict = */ null
);
return [initialState.font, initialState.fontName, initialState.fontSize];
return initialState.font;
}
_computeFontSize(font, fontName, fontSize, height) {
if (fontSize === null || fontSize === 0) {
_computeFontSize(font, height) {
let fontSize = this._defaultAppearanceData.fontSize;
if (!fontSize) {
const { fontColor, fontName } = this._defaultAppearanceData;
let capHeight;
if (font.capHeight) {
capHeight = font.capHeight;
@ -1403,15 +1416,11 @@ class WidgetAnnotation extends Annotation {
// 1.5 * capHeight * fontSize seems to be a good value for lineHeight
fontSize = Math.max(1, Math.floor(height / (1.5 * capHeight)));
let fontRegex = new RegExp(`/${fontName}\\s+[0-9.]+\\s+Tf`);
if (this.data.defaultAppearance.search(fontRegex) === -1) {
// The font size is missing
fontRegex = new RegExp(`/${fontName}\\s+Tf`);
}
this.data.defaultAppearance = this.data.defaultAppearance.replace(
fontRegex,
`/${fontName} ${fontSize} Tf`
);
this.data.defaultAppearance = createDefaultAppearance({
fontSize,
fontName,
fontColor,
});
}
return fontSize;
}