pdf-lib
Version:
Create and modify PDF files with JavaScript
90 lines • 4.15 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
var tslib_1 = require("tslib");
var standard_fonts_1 = require("@pdf-lib/standard-fonts");
var PDFHexString_1 = tslib_1.__importDefault(require("../objects/PDFHexString"));
var utils_1 = require("../../utils");
/**
* A note of thanks to the developers of https://github.com/foliojs/pdfkit, as
* this class borrows from:
* https://github.com/foliojs/pdfkit/blob/f91bdd61c164a72ea06be1a43dc0a412afc3925f/lib/font/afm.coffee
*/
var StandardFontEmbedder = /** @class */ (function () {
function StandardFontEmbedder(fontName) {
// prettier-ignore
this.encoding = (fontName === standard_fonts_1.FontNames.ZapfDingbats ? standard_fonts_1.Encodings.ZapfDingbats
: fontName === standard_fonts_1.FontNames.Symbol ? standard_fonts_1.Encodings.Symbol
: standard_fonts_1.Encodings.WinAnsi);
this.font = standard_fonts_1.Font.load(fontName);
this.fontName = this.font.FontName;
}
/**
* Encode the JavaScript string into this font. (JavaScript encodes strings in
* Unicode, but standard fonts use either WinAnsi, ZapfDingbats, or Symbol
* encodings)
*/
StandardFontEmbedder.prototype.encodeText = function (text) {
var glyphs = this.encodeTextAsGlyphs(text);
var hexCodes = new Array(glyphs.length);
for (var idx = 0, len = glyphs.length; idx < len; idx++) {
hexCodes[idx] = utils_1.toHexString(glyphs[idx].code);
}
return PDFHexString_1.default.of(hexCodes.join(''));
};
StandardFontEmbedder.prototype.widthOfTextAtSize = function (text, size) {
var glyphs = this.encodeTextAsGlyphs(text);
var totalWidth = 0;
for (var idx = 0, len = glyphs.length; idx < len; idx++) {
var left = glyphs[idx].name;
var right = (glyphs[idx + 1] || {}).name;
var kernAmount = this.font.getXAxisKerningForPair(left, right) || 0;
totalWidth += this.widthOfGlyph(left) + kernAmount;
}
var scale = size / 1000;
return totalWidth * scale;
};
StandardFontEmbedder.prototype.heightOfFontAtSize = function (size) {
var _a = this.font, Ascender = _a.Ascender, Descender = _a.Descender, FontBBox = _a.FontBBox;
var yTop = Ascender || FontBBox[3];
var yBottom = Descender || FontBBox[1];
return ((yTop - yBottom) / 1000) * size;
};
StandardFontEmbedder.prototype.sizeOfFontAtHeight = function (height) {
var _a = this.font, Ascender = _a.Ascender, Descender = _a.Descender, FontBBox = _a.FontBBox;
var yTop = Ascender || FontBBox[3];
var yBottom = Descender || FontBBox[1];
return (1000 * height) / (yTop - yBottom);
};
StandardFontEmbedder.prototype.embedIntoContext = function (context, ref) {
var fontDict = context.obj({
Type: 'Font',
Subtype: 'Type1',
BaseFont: this.font.FontName,
Encoding: this.encoding === standard_fonts_1.Encodings.WinAnsi ? 'WinAnsiEncoding' : undefined,
});
if (ref) {
context.assign(ref, fontDict);
return ref;
}
else {
return context.register(fontDict);
}
};
StandardFontEmbedder.prototype.widthOfGlyph = function (glyphName) {
// Default to 250 if font doesn't specify a width
return this.font.getWidthOfGlyph(glyphName) || 250;
};
StandardFontEmbedder.prototype.encodeTextAsGlyphs = function (text) {
var codePoints = Array.from(text);
var glyphs = new Array(codePoints.length);
for (var idx = 0, len = codePoints.length; idx < len; idx++) {
var codePoint = utils_1.toCodePoint(codePoints[idx]);
glyphs[idx] = this.encoding.encodeUnicodeCodePoint(codePoint);
}
return glyphs;
};
StandardFontEmbedder.for = function (fontName) { return new StandardFontEmbedder(fontName); };
return StandardFontEmbedder;
}());
exports.default = StandardFontEmbedder;
//# sourceMappingURL=StandardFontEmbedder.js.map