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LibGfx: Make text painting better at aligning vector fonts vertically

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This is achieved by simplifying the logic in TextLayout. We get rid
of all the various ways that the layout bounding rect can get cropped.
Then we make sure to use the right pixel metrics.

Finally we use the font's own line gap metrics instead of hard-coding 4.

The end result is that text painted with vector fonts now gets pretty
reasonable vertical alignment in most cases.
This commit is contained in:
Andreas Kling 2023-01-06 11:55:23 +01:00
parent f5e18dda2b
commit b2d3ceaec5
4 changed files with 22 additions and 58 deletions
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13
Userland/Libraries/LibGfx/Painter.cpp
View file

@ -1518,11 +1518,6 @@ void draw_text_line(FloatRect const& a_rect, Utf8View const& text, Font const& f
VERIFY_NOT_REACHED();
}
if (is_vertically_centered_text_alignment(alignment)) {
auto distance_from_baseline_to_bottom = (font.pixel_size() - 1) - font.baseline();
rect.translate_by(0, distance_from_baseline_to_bottom / 2);
}
auto point = rect.location();
auto space_width = font.glyph_width(' ') + font.glyph_spacing();
@ -1726,19 +1721,17 @@ void Painter::do_draw_text(FloatRect const& rect, Utf8View const& text, Font con
TextLayout layout(font, text, rect);
auto line_height = font.pixel_size() + LINE_SPACING;
auto line_height = font.preferred_line_height();
auto lines = layout.lines(elision, wrapping, LINE_SPACING);
auto bounding_rect = layout.bounding_rect(wrapping, LINE_SPACING);
auto lines = layout.lines(elision, wrapping);
auto bounding_rect = layout.bounding_rect(wrapping);
bounding_rect.align_within(rect, alignment);
bounding_rect.intersect(rect);
for (size_t i = 0; i < lines.size(); ++i) {
auto line = Utf8View { lines[i] };
FloatRect line_rect { bounding_rect.x(), bounding_rect.y() + i * line_height, bounding_rect.width(), line_height };
line_rect.intersect(rect);
TextDirection line_direction = get_text_direction(line);
if (text_contains_bidirectional_text(line, line_direction)) { // Slow Path: The line contains mixed BiDi classes