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Pango + Cairo, text clusters & invisible glyphs
From: |
Han-Wen Nienhuys |
Subject: |
Pango + Cairo, text clusters & invisible glyphs |
Date: |
Sun, 6 Feb 2022 00:33:06 +0100 |
Hi there,
I'm trying to fix some corner cases in LilyPond's Cairo support. For
proper copy&paste support in our PDF output
(https://gitlab.com/lilypond/lilypond/-/issues/6172), I'm trying to
use cairo_show_text_glyphs(). This seems to mostly work in normal
cases. However, when rendering bidi text in Pango, the direction
changing codes (U+202A, U+202B, U+202C) generate a cluster entry in
Pango, but the glyph is invisible.
Currently, LilyPond simply filters out the invisible glyph, but with
cairo_show_text_glyphs that causes the UTF-8 text, glyph list and
cluster mapping to go out of sync, leading to 'input clusters do not
represent the accompanying text and glyph arrays'
Is there a standard way to specify an invisible glyph to
cairo_show_text_glyphs? I'd rather not have to edit the UTF-8 string
to filter out the invisible chars.
--
Han-Wen Nienhuys - hanwenn@gmail.com - http://www.xs4all.nl/~hanwen
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