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Analysis is incorrect - RTL text is backwards

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
cpp, python

Research direction

Start by reproducing the reported command with the Arabic glyph sequence and compare the shaped output with the expected initial and final positions. Trace the RTL analysis and shaping entry point used by DWriteShapePy; done means the sequence is returned in the correct order with 06cc in initial position and 06d2 in final position.

Written by the indexing model from the issue text.

Description

DWriteShapePy doesn't seem to analyse RTL texts correctly:

PS C:\Users\simon\Desktop> python3 -m dwriteshapepy --language ar .\NNUTest.ttf -u 06cc,0679,06d2
[alefMaksura-ar.fina.alt=0+504.0|tahabove-ar=1@348.0,-389.0+0.0|behDotless-ar.init.yeh=4@0.0,375.0+204.0|nobari=0+0.0|yehbarree-ar.isol=0+1409.0]

The text should be the other way around. (06cc FARSI YEH should be in initial position, 0x6d2 YEH BARREE should be in final position)

Dominant language
C++
Stars
18
Forks
6
Avg merge
1d 28m
Merged PRs (30d)
3

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