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LibPDF: Add very basic support for Adobe Type 1 font rendering

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Previously we would draw all text, no matter what font type, as
Liberation Serif, which results in things like ugly character spacing.

We now have partial support for drawing Type 1 glyphs, which are part of
a PostScript font program. We completely ignore hinting for now, which
results in ugly looking characters at low resolutions, but gain support
for a large number of typefaces, including most of the default fonts
used in TeX.
This commit is contained in:
Julian Offenhäuser 2022-08-25 11:06:21 +02:00 • committed by Andreas Kling
parent e6f29302a7
commit b14f0950a5
9 changed files with 752 additions and 16 deletions
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16
Userland/Libraries/LibPDF/Encoding.cpp
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@ -11,6 +11,17 @@
namespace PDF {
PDFErrorOr<NonnullRefPtr<Encoding>> Encoding::create(HashMap<u16, CharDescriptor> descriptors)
{
auto encoding = adopt_ref(*new Encoding());
encoding->m_descriptors = descriptors;
for (auto& descriptor : descriptors)
encoding->m_name_mapping.set(descriptor.value.name, descriptor.value.code_point);
return encoding;
}
PDFErrorOr<NonnullRefPtr<Encoding>> Encoding::from_object(Document* document, NonnullRefPtr<Object> const& obj)
{
if (obj->is<NameObject>()) {
@ -37,8 +48,9 @@ PDFErrorOr<NonnullRefPtr<Encoding>> Encoding::from_object(Document* document, No
}
auto encoding = adopt_ref(*new Encoding());
for (auto& [code_point, descriptor] : base_encoding->descriptors())
encoding->m_descriptors.set(code_point, descriptor);
encoding->m_descriptors = base_encoding->descriptors();
encoding->m_name_mapping = base_encoding->name_mapping();
auto differences_array = TRY(dict->get_array(document, CommonNames::Differences));