font-patcher: Fix scaleGlyph related rounding error #921
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[why] Sometimes the patched-in symbols are slightly too big, which shows up in Nerd Font Mono fonts where the destination size is specified exactly. That issues a warning like: Warning: Scaled glyph U+F077 wider than one monospace width [how] For the scaleGlyph groups we need to combine the bounding boxes of several symbol glyphs to determine the 'combined' scale we need. Unfortunately when the concrete glyph is finally copied over its size can change minimally. So we need to measure the glyphs in the scaleGroup _after_ they have been copied to the to-be-patched font. This is a bit complicated, because we need to know some glyph slot we can use for that. [note] See also commit e805b87 font-patcher: Resolve rounding error when rescaling Fixes: #917 Signed-off-by: Fini Jastrow <ulf.fini.jastrow@desy.de>
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[why]
Sometimes the patched-in symbols are slightly too big, which shows up in Nerd Font Mono fonts where the destination size is specified exactly.
That issues a warning like:
[how]
For the
scaleGlyphgroups we need to combine the bounding boxes of several symbol glyphs to determine the 'combined' scale we need. Unfortunately when the concrete glyph is finally copied over its size can change minimally.So we need to measure the glyphs in the
scaleGroupafter they have been copied to the to-be-patched font. This is a bit complicated, because we need to know some glyph slot we can use for that.[note]
See also commit
e805b87
font-patcher: Resolve rounding error when rescalingFixes: #917
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