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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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10
Userland/Libraries/LibWeb/CSS/StyleComputer.cpp
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@ -2036,7 +2036,7 @@ Length::FontMetrics StyleComputer::calculate_root_element_font_metrics(StyleProp
auto root_value = style.property(CSS::PropertyID::FontSize);
auto font_pixel_metrics = style.computed_font().pixel_metrics();
Length::FontMetrics font_metrics { m_default_font_metrics.font_size, font_pixel_metrics, CSSPixels(font_pixel_metrics.line_spacing()) };
Length::FontMetrics font_metrics { m_default_font_metrics.font_size, font_pixel_metrics, CSSPixels::nearest_value_for(font_pixel_metrics.line_spacing()) };
font_metrics.font_size = root_value->as_length().length().to_px(viewport_rect(), font_metrics, font_metrics);
font_metrics.line_height = style.line_height(viewport_rect(), font_metrics, font_metrics);
@ -2197,7 +2197,7 @@ RefPtr<Gfx::Font const> StyleComputer::compute_font_for_style_values(DOM::Elemen
// and smaller may compute the font size to the previous entry in the table.
if (identifier == CSS::ValueID::Smaller || identifier == CSS::ValueID::Larger) {
if (parent_element && parent_element->computed_css_values()) {
font_size_in_px = CSSPixels(parent_element->computed_css_values()->computed_font().pixel_metrics().size);
font_size_in_px = CSSPixels::nearest_value_for(parent_element->computed_css_values()->computed_font().pixel_metrics().size);
}
}
auto const multiplier = absolute_size_mapping.get(identifier).value_or(1.0);
@ -2213,7 +2213,7 @@ RefPtr<Gfx::Font const> StyleComputer::compute_font_for_style_values(DOM::Elemen
Optional<Length> maybe_length;
if (font_size.is_percentage()) {
// Percentages refer to parent element's font size
maybe_length = Length::make_px(CSSPixels(font_size.as_percentage().percentage().as_fraction() * parent_font_size().to_double()));
maybe_length = Length::make_px(CSSPixels::nearest_value_for(font_size.as_percentage().percentage().as_fraction() * parent_font_size().to_double()));
} else if (font_size.is_length()) {
maybe_length = font_size.as_length().length();
@ -2350,7 +2350,7 @@ void StyleComputer::compute_font(StyleProperties& style, DOM::Element const* ele
auto found_font = compute_font_for_style_values(element, pseudo_element, font_family, font_size, font_style, font_weight, font_stretch);
style.set_property(CSS::PropertyID::FontSize, LengthStyleValue::create(CSS::Length::make_px(CSSPixels(found_font->pixel_size()))), nullptr);
style.set_property(CSS::PropertyID::FontSize, LengthStyleValue::create(CSS::Length::make_px(CSSPixels::nearest_value_for(found_font->pixel_size()))), nullptr);
style.set_property(CSS::PropertyID::FontWeight, NumberStyleValue::create(font_weight->to_font_weight()));
style.set_computed_font(found_font.release_nonnull());
@ -2401,7 +2401,7 @@ void StyleComputer::absolutize_values(StyleProperties& style, DOM::Element const
auto line_height_value_slot = style.m_property_values[to_underlying(CSS::PropertyID::LineHeight)].map([](auto& x) -> auto& { return x.style; });
if (line_height_value_slot.has_value() && (*line_height_value_slot)->is_percentage()) {
*line_height_value_slot = LengthStyleValue::create(
Length::make_px(CSSPixels(font_size * static_cast<double>((*line_height_value_slot)->as_percentage().percentage().as_fraction()))));
Length::make_px(CSSPixels::nearest_value_for(font_size * static_cast<double>((*line_height_value_slot)->as_percentage().percentage().as_fraction()))));
}
auto line_height = style.line_height(viewport_rect(), font_metrics, m_root_element_font_metrics);