snowie2000/mactype

ClipBox problem with combining characters

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#282 opened on May 27, 2017

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bugfuture versionhelp wanted

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Description

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.

Contributor guide

Research direction
Inspect the clipbox calculation logic for combining characters in the MacType cairo backend. Trace the path from font rendering to clipping.
Tech stack
cpp
Domain
desktop
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GitC++
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65