mirrors/pdf.js - Forgejo

mirrors/pdf.js

mirror of https://github.com/mozilla/pdf.js.git synced 2025-04-19 22:58:07 +02:00

Ignoring revisions in .git-blame-ignore-revs. Click here to bypass and see the normal blame view.

1 line

88 B

SYSTEMD

Raw Permalink Normal View History

Map all glyphs to the private use area and duplicate the first glyph. There have been lots of problems with trying to map glyphs to their unicode values. It's more reliable to just use the private use areas so the browser's font renderer doesn't mess with the glyphs. Using the private use area for all glyphs did highlight other issues that this patch also had to fix: * small private use area - Previously, only the BMP private use area was used which can't map many glyphs. Now, the (much bigger) PUP 16 area can also be used. * glyph zero not shown - Browsers will not use the glyph from a font if it is glyph id = 0. This issue was less prevalent when we mapped to unicode values since the fallback font would be used. However, when using the private use area, the glyph would not be drawn at all. This is illustrated in one of the current test cases (issue #8234) where there's an "ä" glyph at position zero. The PDF looked like it rendered correctly, but it was actually not using the glyph from the font. To properly show the first glyph it is always duplicated and appended to the glyphs and the maps are adjusted. * supplementary characters - The private use area PUP 16 is 4 bytes, so String.fromCodePoint must be used where we previously used String.fromCharCode. This is actually an issue that should have been fixed regardless of this patch. * charset - Freetype fails to load fonts when the charset size doesn't match number of glyphs in the font. We now write out a fake charset with the correct length. This also brought up the issue that glyphs with seac/endchar should only ever write a standard charset, but we now write a custom one. To get around this the seac analysis is permanently enabled so those glyphs are instead always drawn as two glyphs.

2018-01-04 14:43:07 -08:00

https://web.archive.org/web/20171116124714/https://www.unicode.org/charts/PDF/U11A50.pdf