hfg-gmuend/openmoji

OpenMoji-Color fonts incompatible with WinAPI.

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#478 建立於 2023年12月1日

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help wanted

描述

For MS Windows Software, the common (also simplest) way to use Color Fonts with API (DirectWrite) is: "To opt in to color glyph rendering, pass the D2D1_DRAW_TEXT_OPTIONS_ENABLE_COLOR_FONT" This works with several fonts (Segoe UI Emoji, Twemoji Mozilla, EmojiTwo COLRv0, Noto Color Emoji). But with OpenMoji, the text never shows OpenMoji glyphs, but only fallback-glyphs (if available) from Segoe UI Emoji. The big FOSS software (Browsers, Libre Office) use other libraries which don't have this problem. But typical app developers use DirectWrite or components based on DirectWrite. DirectWrite officially supports COLR (v0, v1) and some other formats. There must be some solution to generate the font file (eg. COLRv0) compliantly,
but I have no knowledge about file details and potential modifications or tools.

貢獻者指南

技術棧
無
領域
apidesktop
議題類型
bug
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
4
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
3-5 days
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
stale
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
needs investigation
前置要求
Understanding of COLR font formatFamiliarity with DirectWrite APIKnowledge of font generation tools
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
20
研究方向
Investigate the OpenMoji font file structure and compare with working fonts like Segoe UI Emoji or Noto Color Emoji. Check if the font uses COLRv0 or v1 and whether any flags or tables are missing. Look at tools like fonttools (Python) to inspect and potentially modify the font. Review any existing issues or documentation about OpenMoji font generation pipeline in the repository.