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feat: <sup> and <sub> support (#2131)

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## Summary

* **What is the goal of this PR?** Support for `<sup>` and `<sub>` tags.

## Additional Context

This isn't my work, but @jpirnay 's (missing you here, man!). I migrated
his work from
https://github.com/jpirnay/crosspoint-reader/commit/bcd8c32cf26447ccc792cfedd2fdbfce4fee5210
with some micro-optimizations.

Screenshots: 

[Subscript-and-Superscript-Tests_ch2_p1_10pct_55632.bmp](https://github.com/user-attachments/files/28196936/Subscript-and-Superscript-Tests_ch2_p1_10pct_55632.bmp)

[Subscript-and-Superscript-Tests_ch3_p1_21pct_77473.bmp](https://github.com/user-attachments/files/28196937/Subscript-and-Superscript-Tests_ch3_p1_21pct_77473.bmp)


---

### AI Usage

While CrossPoint doesn't have restrictions on AI tools in contributing,
please be transparent about their usage as it
helps set the right context for reviewers.

Did you use AI tools to help write this code? _**< YES >**_

---------

Co-authored-by: jpirnay <jens@pirnay.com>
Co-authored-by: Julia <julia@uxj.io>
This commit is contained in:
Uri Tauber
2026-05-26 12:38:40 -04:00
committed by GitHub
co-authored by jpirnay Julia
parent 34e923d722
commit c5e861d71c
11 changed files with 443 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/EpdFont/EpdFontFamily.h
+14 -1
View File
@@ -3,7 +3,20 @@
class EpdFontFamily {
public:
enum Style : uint8_t { REGULAR = 0, BOLD = 1, ITALIC = 2, BOLD_ITALIC = 3, UNDERLINE = 4 };
// Bitmask of text style flags carried per-word through layout and serialized in page cache.
// Bits 0-1 select the font variant (BOLD/ITALIC); bits 2-5 are decoration/positioning overlays
// applied at render time without changing the underlying font. getFont() ignores all bits
// above bit 1 so decorations compose freely with bold/italic (e.g. BOLD | UNDERLINE | SUP).
enum Style : uint8_t {
REGULAR = 0,
BOLD = 1,
ITALIC = 2,
BOLD_ITALIC = 3,
UNDERLINE = 4, // drawn as a line below baseline by TextBlock::render()
STRIKETHROUGH = 8, // drawn as a line through midline by TextBlock::render()
SUP = 16, // superscript: glyph scaled 50%, raised ~40% of ascender
SUB = 32, // subscript: glyph scaled 50%, lowered ~25% of ascender
};
explicit EpdFontFamily(const EpdFont* regular, const EpdFont* bold = nullptr, const EpdFont* italic = nullptr,
const EpdFont* boldItalic = nullptr)