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Detect font type before parsing

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Antonin Stefanutti 2024-08-16 17:21:45 +02:00 committed by Antonin Stefanutti
parent 22326d4bfe
commit 659d10dee9
1 changed files with 11 additions and 1 deletions
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12
decktape.js
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@ -497,7 +497,7 @@ async function printSlide(pdf, slide, context) {
// Some fonts written in the PDF may be ill-formed. Let's skip font compression in that case,
// until it's fixed in Puppeteer > Chromium > Skia.
// This happens for system fonts like Helvetica Neue for which cmap table is missing.
font = Font.create(Buffer.from(bytes), { type: 'ttf', hinting: true });
font = Font.create(Buffer.from(bytes), { type: fontType(bytes), hinting: true });
} catch (e) {
console.log(chalk.yellow('\nSkipping font compression: %s'), e.message);
return;
@ -534,6 +534,16 @@ async function printSlide(pdf, slide, context) {
}
};
function fontType(bytes) {
const buffer = Buffer.from(bytes);
if (buffer.readInt32BE() === 0x10000) {
return 'ttf';
}
if (buffer.toString('utf8', 0, 4) === 'OTTO') {
return 'otf';
}
}
function mergeGlyph(font, index, glyf) {
if (font.data.glyf.length <= index) {
for (let i = font.data.glyf.length; i < index; i++) {