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LibWeb: Add CSSPixels::nearest_value_for(FloatingPoint)

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This is intended to annotate conversions from unknown floating-point
values to CSSPixels, and make it more obvious the fp value will be
rounded to the nearest fixed-point value.
This commit is contained in:
MacDue 2023-08-26 15:57:31 +01:00 • committed by Alexander Kalenik
parent 360c0eb509
commit 71baa8c31a
28 changed files with 120 additions and 112 deletions
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14
Userland/Libraries/LibWeb/Layout/LineBuilder.cpp
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@ -195,10 +195,10 @@ void LineBuilder::update_last_line()
auto& font = m_context.containing_block().font();
auto const line_height = m_context.containing_block().line_height();
auto const font_metrics = font.pixel_metrics();
auto const typographic_height = CSSPixels(font_metrics.ascent + font_metrics.descent);
auto const typographic_height = CSSPixels::nearest_value_for(font_metrics.ascent + font_metrics.descent);
auto const leading = line_height - typographic_height;
auto const half_leading = leading / 2;
return CSSPixels(font_metrics.ascent) + half_leading;
return CSSPixels::nearest_value_for(font_metrics.ascent) + half_leading;
}();
auto line_box_baseline = [&] {
@ -207,7 +207,7 @@ void LineBuilder::update_last_line()
auto const& font = fragment.layout_node().font();
auto const line_height = fragment.layout_node().line_height();
auto const font_metrics = font.pixel_metrics();
auto const typographic_height = CSSPixels(font_metrics.ascent + font_metrics.descent);
auto const typographic_height = CSSPixels::nearest_value_for(font_metrics.ascent + font_metrics.descent);
auto const leading = line_height - typographic_height;
auto const half_leading = leading / 2;
@ -215,7 +215,7 @@ void LineBuilder::update_last_line()
CSSPixels fragment_baseline = 0;
if (fragment.layout_node().is_text_node()) {
fragment_baseline = CSSPixels(font_metrics.ascent) + half_leading;
fragment_baseline = CSSPixels::nearest_value_for(font_metrics.ascent) + half_leading;
} else {
auto const& box = verify_cast<Layout::Box>(fragment.layout_node());
fragment_baseline = m_context.box_baseline(box);
@ -302,11 +302,11 @@ void LineBuilder::update_last_line()
bottom_of_inline_box = (fragment.offset().y() + fragment_box_state.content_height() + fragment_box_state.margin_box_bottom());
} else {
auto font_metrics = fragment.layout_node().font().pixel_metrics();
auto typographic_height = CSSPixels(font_metrics.ascent + font_metrics.descent);
auto typographic_height = CSSPixels::nearest_value_for(font_metrics.ascent + font_metrics.descent);
auto leading = fragment.layout_node().line_height() - typographic_height;
auto half_leading = leading / 2;
top_of_inline_box = (fragment.offset().y() + fragment.baseline() - CSSPixels(font_metrics.ascent) - half_leading);
bottom_of_inline_box = (fragment.offset().y() + fragment.baseline() + CSSPixels(font_metrics.descent) + half_leading);
top_of_inline_box = (fragment.offset().y() + fragment.baseline() - CSSPixels::nearest_value_for(font_metrics.ascent) - half_leading);
bottom_of_inline_box = (fragment.offset().y() + fragment.baseline() + CSSPixels::nearest_value_for(font_metrics.descent) + half_leading);
}
if (auto const* length_percentage = fragment.layout_node().computed_values().vertical_align().get_pointer<CSS::LengthPercentage>()) {
if (length_percentage->is_length())