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LibPDF: Add missing character quirk for WinAnsiEncoding fonts

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Fonts with the encoding name "WinAnsiEncoding" should render missing
characters above character code 040 (octal) as a "bullet" character.

This patch adds Encoding::should_map_to_bullet(char_code) which is then
called by char_code_to_code_point() to check if the given char code
should be displayed as a bullet instead.

I didn't have a good way to test this, so I've only verified that it
works by manually overriding inputs to the function during the rendering
stage.

This takes care of a FIXME in the Annex D part of the PDF specification.
This commit is contained in:
Andreas Kling 2022-11-19 20:23:18 +01:00
parent f4f5b045ca
commit d6a3be1615
4 changed files with 20 additions and 1 deletions
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3
Userland/Libraries/LibPDF/Fonts/TrueTypeFont.cpp
View file

@ -48,6 +48,9 @@ u32 TrueTypeFont::char_code_to_code_point(u16 char_code) const
if (m_data.to_unicode)
TODO();
if (m_data.encoding->should_map_to_bullet(char_code))
return 8226; // Bullet.
auto descriptor = m_data.encoding->get_char_code_descriptor(char_code);
return descriptor.code_point;
}

3
Userland/Libraries/LibPDF/Fonts/Type1Font.cpp
View file

@ -57,6 +57,9 @@ u32 Type1Font::char_code_to_code_point(u16 char_code) const
if (m_data.to_unicode)
TODO();
if (m_data.encoding->should_map_to_bullet(char_code))
return 8226; // Bullet.
auto descriptor = m_data.encoding->get_char_code_descriptor(char_code);
return descriptor.code_point;
}