snowie2000/mactype

ClipBox problem with combining characters

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#282 建立於 2017年5月27日

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 (33 留言) (0 反應) (1 負責人)C++ (9,178 star) (446 fork)batch import
bugfuture versionhelp wanted

描述

The character is clipped if it is decorated by a combining character. Here is an example with IPA diacritics in Firefox (font: Segoe UI, backend: cairo):

example

Tried ClipBoxFix = 1, it doesn't work. I think this is caused by the combining character. Since its clipbox is smaller than the decorated character's, part of the decorated character is clipped.

貢獻者指南

技術棧
cpp
領域
frontend
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。
over 1 week
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。
clear
前置要求
Font rendering basicsC++ debuggingWindows APIMacType architecture
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 ClipBoxFix mechanism and its interaction with combining characters. Look at the font rendering code, particularly in the cairo backend, to understand how clip boxes are computed. Review existing comments and any work by the assignee (if any). Consider testing with different fonts and backends to isolate the issue.