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Together with the already-merged #23122, #23128, #23135, #23136, #23162, and #23167, #23179, #23190, #23194 this adds initial support for rendering some CFF-based Type0 fonts :^) There's a long list of things that still need improving after this: * A small number of CFF programs contain the charstring command 0, which is invalid. Currently, this makes us reject the whole font. * Type1FontProgram::rasterize_glyph() is name-based. For CID-based fonts, we want a version that takes CIDs (character IDs) instead. For now, I'm printing the CID to a string and using that, yuck. (I looked into doing this nicely. I do want to do that, but I need to read up on how the `seac` type1 charstring command uses character names to identify parts of an accented character. Also, it looks like `seac`'s accented character handling moved over to `endchar` in type2 charstring commands (i.e. in CFF data), and it looks like we don't implement that at all. So I need to do more reading first, and I didn't want to block this on that.) * The name for the first string in name-based CFF fonts looks wrong; added a FIXME for that for now. * This supports the named Identity-H cmap only for now. Identity-H maps UTF16-BE values to glyph IDs with the idenity function, and assumes it's horizontal text. Other named cmaps in my test files are UniJIS-UCS2-H, UniCNS-UCS2-H, Identity-V, UniGB-UCS2-H, UniKS-UCS2-H. (There are also 2 files using the stream-based cmaps instead of the name-based ones.) * In particular, we can't draw vertical text (`-V`) yet * Passing in the encoding to CFF::create() is awkward (it's nullptr for CID-keyed fonts), and it's also not necessary since `Type1Font::draw_glyph()` already does the "take encoding from PDF, and only from font if the PDF doesn't store one" dance. * This doesn't cache glyphs but re-rasterizes them each time. Easy to add, but maybe I want to look at rotation first. And things don't feel glacial as-is. * Type0Font::draw_glyph() is pretty similar to second half of Type1Font::draw_glyph() |
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