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LibWeb+WebContent: Forbid access to underlying type of CSSPixels

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Although DistinctNumeric, which is supposed to abstract the underlying
type, was used to represent CSSPixels, we have a whole bunch of places
in the layout code that assume CSSPixels::value() returns a
floating-point type. This assumption makes it difficult to replace the
underlying type in CSSPixels with a non-floating type.

To make it easier to transition CSSPixels to fixed-point math, one step
we can take is to prevent access to the underlying type using value()
and instead use explicit conversions with the to_float(), to_double(),
and to_int() methods.
This commit is contained in:
Aliaksandr Kalenik 2023-06-12 21:37:35 +03:00 • committed by Andreas Kling
parent 5a54c686a7
commit 147c3b3d97
43 changed files with 340 additions and 220 deletions
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6
Userland/Libraries/LibWeb/Layout/Node.cpp
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@ -298,7 +298,7 @@ void NodeWithStyle::apply_style(const CSS::StyleProperties& computed_style)
// m_font is used by Length::to_px() when resolving sizes against this layout node.
// That's why it has to be set before everything else.
m_font = computed_style.computed_font();
computed_values.set_font_size(computed_style.property(CSS::PropertyID::FontSize)->as_length().length().to_px(*this).value());
computed_values.set_font_size(computed_style.property(CSS::PropertyID::FontSize)->as_length().length().to_px(*this).to_double());
computed_values.set_font_weight(round_to<int>(computed_style.property(CSS::PropertyID::FontWeight)->as_number().number()));
m_line_height = computed_style.line_height(*this);
@ -644,9 +644,9 @@ void NodeWithStyle::apply_style(const CSS::StyleProperties& computed_style)
auto resolve_border_width = [&]() -> double {
auto value = computed_style.property(width_property);
if (value->is_calculated())
return value->as_calculated().resolve_length(*this)->to_px(*this).value();
return value->as_calculated().resolve_length(*this)->to_px(*this).to_double();
if (value->is_length())
return value->as_length().length().to_px(*this).value();
return value->as_length().length().to_px(*this).to_double();
if (value->is_identifier()) {
// https://www.w3.org/TR/css-backgrounds-3/#valdef-line-width-thin
switch (value->to_identifier()) {