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LibGfx: Implement TTF kerning tables

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If a TTF font contains kern tables, we now read through all of them and
apply any kerning values to character rendering.
This commit is contained in:
Jelle Raaijmakers 2022-03-24 16:20:43 +01:00 • committed by Andreas Kling
parent e72f59cd23
commit b17fb76ace
6 changed files with 208 additions and 5 deletions
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8
Userland/Libraries/LibGfx/Painter.cpp
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@ -1378,12 +1378,19 @@ void draw_text_line(IntRect const& a_rect, Utf8View const& text, Font const& fon
space_width = -space_width; // Draw spaces backwards
}
u32 last_code_point { 0 };
for (auto it = text.begin(); it != text.end(); ++it) {
auto code_point = *it;
if (code_point == ' ') {
point.translate_by(space_width, 0);
last_code_point = code_point;
continue;
}
int kerning = font.glyphs_horizontal_kerning(last_code_point, code_point);
if (kerning != 0)
point.translate_by(direction == TextDirection::LTR ? kerning : -kerning, 0);
IntSize glyph_size(font.glyph_or_emoji_width(code_point) + font.glyph_spacing(), font.glyph_height());
if (direction == TextDirection::RTL)
point.translate_by(-glyph_size.width(), 0); // If we are drawing right to left, we have to move backwards before drawing the glyph
@ -1393,6 +1400,7 @@ void draw_text_line(IntRect const& a_rect, Utf8View const& text, Font const& fon
// The callback function might have exhausted the iterator.
if (it == text.end())
break;
last_code_point = code_point;
}
}