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LibGfx: Handle multi-code point emoji when computing scaled glyph width

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This commit is contained in:
Timothy Flynn 2023-03-02 07:50:56 -05:00 • committed by Andreas Kling
parent 4a20751ff6
commit 61f794d473
1 changed files with 19 additions and 13 deletions
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32
Userland/Libraries/LibGfx/Font/ScaledFont.cpp
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@ -6,6 +6,7 @@
#include <AK/Utf32View.h>
#include <AK/Utf8View.h>
#include <LibGfx/Font/Emoji.h>
#include <LibGfx/Font/ScaledFont.h>
namespace Gfx {
@ -44,18 +45,20 @@ ALWAYS_INLINE float ScaledFont::unicode_view_width(T const& view) const
float width = 0;
float longest_width = 0;
u32 last_code_point = 0;
for (auto code_point : view) {
for (auto it = view.begin(); it != view.end(); last_code_point = *it, ++it) {
auto code_point = *it;
if (code_point == '\n' || code_point == '\r') {
longest_width = max(width, longest_width);
width = 0;
last_code_point = code_point;
continue;
}
u32 glyph_id = glyph_id_for_code_point(code_point);
auto kerning = glyphs_horizontal_kerning(last_code_point, code_point);
width += kerning + glyph_metrics(glyph_id).advance_width;
last_code_point = code_point;
width += kerning + glyph_or_emoji_width(it);
}
longest_width = max(width, longest_width);
return longest_width;
}
@ -98,20 +101,23 @@ float ScaledFont::glyph_width(u32 code_point) const
return metrics.advance_width;
}
template<typename CodePointIterator>
static float glyph_or_emoji_width_impl(ScaledFont const& font, CodePointIterator& it)
{
if (auto const* emoji = Emoji::emoji_for_code_point_iterator(it))
return font.pixel_size() * emoji->width() / emoji->height();
return font.glyph_width(*it);
}
float ScaledFont::glyph_or_emoji_width(Utf8CodePointIterator& it) const
{
// FIXME: Support multi-code point emoji with scaled fonts.
auto id = glyph_id_for_code_point(*it);
auto metrics = glyph_metrics(id);
return metrics.advance_width;
return glyph_or_emoji_width_impl(*this, it);
}
float ScaledFont::glyph_or_emoji_width(Utf32CodePointIterator& it) const
{
// FIXME: Support multi-code point emoji with scaled fonts.
auto id = glyph_id_for_code_point(*it);
auto metrics = glyph_metrics(id);
return metrics.advance_width;
return glyph_or_emoji_width_impl(*this, it);
}
float ScaledFont::glyphs_horizontal_kerning(u32 left_code_point, u32 right_code_point) const