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LibGfx: Support computing a font's glyph width with code point iterators

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This allows consideration of multi-code point glyphs.
This commit is contained in:
Timothy Flynn 2023-02-20 14:40:12 -05:00 • committed by Andreas Kling
parent 71967bc5de
commit a391ea3da3
5 changed files with 46 additions and 22 deletions
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41
Userland/Libraries/LibGfx/Font/BitmapFont.cpp
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@ -314,23 +314,34 @@ float BitmapFont::glyph_width(u32 code_point) const
return m_fixed_width || !index.has_value() ? m_glyph_width : m_glyph_widths[index.value()];
}
int BitmapFont::glyph_or_emoji_width_for_variable_width_font(u32 code_point) const
template<typename CodePointIterator>
static float glyph_or_emoji_width_impl(BitmapFont const& font, CodePointIterator& it)
{
// FIXME: This is a hack in lieu of proper code point identification.
// 0xFFFF is arbitrary but also the end of the Basic Multilingual Plane.
if (code_point < 0xFFFF) {
auto index = glyph_index(code_point);
if (!index.has_value())
return glyph_width(0xFFFD);
if (m_glyph_widths[index.value()] > 0)
return glyph_width(code_point);
return glyph_width(0xFFFD);
}
if (auto const* emoji = Emoji::emoji_for_code_point_iterator(it))
return font.pixel_size() * emoji->width() / emoji->height();
auto const* emoji = Emoji::emoji_for_code_point(code_point);
if (emoji == nullptr)
return glyph_width(0xFFFD);
return glyph_height() * emoji->width() / emoji->height();
if (font.is_fixed_width())
return font.glyph_fixed_width();
return font.glyph_width(*it);
}
float BitmapFont::glyph_or_emoji_width(u32 code_point) const
{
Utf32View code_point_view { &code_point, 1 };
auto it = code_point_view.begin();
return glyph_or_emoji_width_impl(*this, it);
}
float BitmapFont::glyph_or_emoji_width(Utf8CodePointIterator& it) const
{
return glyph_or_emoji_width_impl(*this, it);
}
float BitmapFont::glyph_or_emoji_width(Utf32CodePointIterator& it) const
{
return glyph_or_emoji_width_impl(*this, it);
}
float BitmapFont::width(StringView view) const { return unicode_view_width(Utf8View(view)); }