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LibWeb: Make text fragment indexing handle multi-code point glyphs

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Timothy Flynn 2023-02-22 12:08:44 -05:00 • committed by Linus Groh
parent 3d7b13ac03
commit 8d0b0fbdd3
1 changed files with 6 additions and 2 deletions
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8
Userland/Libraries/LibWeb/Layout/LineBoxFragment.cpp
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@ -58,11 +58,15 @@ int LineBoxFragment::text_index_at(CSSPixels x) const
CSSPixels width_so_far = 0; CSSPixels width_so_far = 0;
for (auto it = view.begin(); it != view.end(); ++it) { for (auto it = view.begin(); it != view.end(); ++it) {
CSSPixels glyph_width = font.glyph_or_emoji_width(*it); auto previous_it = it;
CSSPixels glyph_width = font.glyph_or_emoji_width(it);
if ((width_so_far + (glyph_width + glyph_spacing) / 2) > relative_x) if ((width_so_far + (glyph_width + glyph_spacing) / 2) > relative_x)
return m_start + view.byte_offset_of(it); return m_start + view.byte_offset_of(previous_it);
width_so_far += glyph_width + glyph_spacing; width_so_far += glyph_width + glyph_spacing;
} }
return m_start + m_length; return m_start + m_length;
} }