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CoreText: prevent colored glyphs (like emoji) to be clipped

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To prevent colored glyphs (like emoji) from being cut off at the edges,
we can simply apply the solution from bbba71748438dc05d344bb9727f10b7f55a5d229
to colored glyphs as well (i.e. to glyphs with QFontEngine::Format_ARGB format).

Fixes: QTBUG-133297
Pick-to: 6.9 6.8
Change-Id: I5578e2d12f956d0635b662b3ecf714aa63474945
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>
This commit is contained in:
Vladimir Belyavsky 2025-01-28 22:04:40 +03:00 committed by Tor Arne Vestbø
parent d076420bb0
commit 7cc0ea0b5a
1 changed files with 3 additions and 2 deletions
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5
src/gui/text/coretext/qfontengine_coretext.mm
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@ -591,8 +591,9 @@ glyph_metrics_t QCoreTextFontEngine::alphaMapBoundingBox(glyph_t glyph, const QF
if (br.height < 0)
br.height = -br.height;
if (format == QFontEngine::Format_A8 || format == QFontEngine::Format_A32) {
// Drawing a glyph at x-position 0 with anti-aliasing enabled
if (format == QFontEngine::Format_A8 || format == QFontEngine::Format_A32 || format == QFontEngine::Format_ARGB) {
// Drawing a vector based glyph with anti-aliasing enabled, or a
// bitmap based glyph with pre-baked anti-aliasing, at x = 0,
// will potentially fill the pixel to the left of 0, as the
// coordinates are not aligned to the center of pixels. To
// prevent clipping of this pixel we need to shift the glyph