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font's Issues

License

Hey,

I would like to depend on this project transitively through grafeia/ReX as it can work with arbitrary font files in contrast to the original ReX.

However, this project as well unicode-math unfortunately don't have license files. In case you would like for this project to be permissively accessible, it would be very kind if you could add license files!

Fails to load some fonts contained in PDF

I opened the following PDF using pdf-rs and tried to render it using pdf_render.
https://arxiv.org/pdf/1912.13318.pdf
However, I got the following error:

[2021-05-05T04:24:11Z DEBUG font::type1] FontDict keys: /"FontInfo", /"CharStrings", /"FontName", /"Encoding", /"FontBBox", /"FontMatrix", /"FontType", /"PaintType", /"Private"
[2021-05-05T04:24:11Z DEBUG font::type1] Private keys: /"MinFeature", /"BlueFuzz", /"Subrs", /"FamilyOtherBlues", /"lenIV", /"password", /"FamilyBlues", /"BlueScale", /"LanguageGroup", /"StemSnapV", /"ExpansionFactor", /"OtherSubrs", /"StemSnapH", /"BlueValues", /"ForceBold", /"OtherBlues", /"NP", /"RD", /"ND", /"BlueShift", /"StdHW", /"StdVW"
[2021-05-05T04:24:11Z DEBUG font::type1] FontName: Some(/"GLEUEB+LinLibertineT")
[2021-05-05T04:24:11Z DEBUG font::type1] FontInfo: Some()
thread 'main' panicked at 'tried to cast a float to int', /Users/k-akabe/.cargo/git/checkouts/font-06ada714b08e6cdd/a2ff1d2/src/lib.rs:208:32
stack backtrace:
   0: std::panicking::begin_panic
             at /Users/k-akabe/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/src/rust/library/std/src/panicking.rs:519:12
   1: font::Value::to_int
             at /Users/k-akabe/.cargo/git/checkouts/font-06ada714b08e6cdd/a2ff1d2/src/lib.rs:208:32
   2: font::type1::charstring
             at /Users/k-akabe/.cargo/git/checkouts/font-06ada714b08e6cdd/a2ff1d2/src/type1.rs:287:31
   3: font::type1::Type1Font::from_vm
             at /Users/k-akabe/.cargo/git/checkouts/font-06ada714b08e6cdd/a2ff1d2/src/type1.rs:125:13
   4: font::type1::Type1Font::parse_postscript
             at /Users/k-akabe/.cargo/git/checkouts/font-06ada714b08e6cdd/a2ff1d2/src/type1.rs:73:9
   5: font::parse
             at /Users/k-akabe/.cargo/git/checkouts/font-06ada714b08e6cdd/a2ff1d2/src/lib.rs:419:29
   6: pdf_render::cache::Cache::load_font
             at /Users/k-akabe/.cargo/git/checkouts/pdf_render-56211f49c16f7190/4b123c5/render/src/cache.rs:104:38
   7: pdf_render::cache::Cache::render_page
             at /Users/k-akabe/.cargo/git/checkouts/pdf_render-56211f49c16f7190/4b123c5/render/src/cache.rs:166:13
   8: pftest::main
             at ./src/main.rs:112:26
   9: core::ops::function::FnOnce::call_once
             at /Users/k-akabe/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/src/rust/library/core/src/ops/function.rs:227:5

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