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LibWeb: Remove implicit conversion from float and double to CSSPixels

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In general it is not safe to convert any arbitrary floating-point value
to CSSPixels. CSSPixels has a resolution of 0.015625, which for small
values (e.g. scale factors between 0 and 1), can produce bad results
if converted to CSSPixels then scaled back up. In the worst case values
can underflow to zero and produce incorrect results.
This commit is contained in:
MacDue 2023-08-26 15:03:04 +01:00 • committed by Alexander Kalenik
parent 0f9c088302
commit 360c0eb509
43 changed files with 248 additions and 221 deletions
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14
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, font_pixel_metrics.line_spacing() };
Length::FontMetrics font_metrics { m_default_font_metrics.font_size, font_pixel_metrics, CSSPixels(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);
@ -2150,7 +2150,7 @@ RefPtr<Gfx::Font const> StyleComputer::compute_font_for_style_values(DOM::Elemen
bool bold = weight > Gfx::FontWeight::Regular;
// FIXME: Should be based on "user's default font size"
float font_size_in_px = 16;
CSSPixels font_size_in_px = 16;
auto parent_line_height = parent_or_root_element_line_height(element, pseudo_element);
Gfx::FontPixelMetrics font_pixel_metrics;
@ -2197,11 +2197,11 @@ 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 = parent_element->computed_css_values()->computed_font().pixel_metrics().size;
font_size_in_px = CSSPixels(parent_element->computed_css_values()->computed_font().pixel_metrics().size);
}
}
auto const multiplier = absolute_size_mapping.get(identifier).value_or(1.0);
font_size_in_px *= multiplier;
font_size_in_px.scale_by(multiplier);
} else {
Length::ResolutionContext const length_resolution_context {
@ -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(font_size.as_percentage().percentage().as_fraction() * parent_font_size().to_double());
maybe_length = Length::make_px(CSSPixels(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(found_font->pixel_size())), nullptr);
style.set_property(CSS::PropertyID::FontSize, LengthStyleValue::create(CSS::Length::make_px(CSSPixels(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(font_size * static_cast<double>((*line_height_value_slot)->as_percentage().percentage().as_fraction())));
Length::make_px(CSSPixels(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);