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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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8
Userland/Libraries/LibWeb/CSS/StyleProperties.cpp
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@ -204,7 +204,7 @@ CSSPixels StyleProperties::line_height(Layout::Node const& layout_node) const
auto line_height = property(CSS::PropertyID::LineHeight);
if (line_height->is_identifier() && line_height->to_identifier() == ValueID::Normal)
return layout_node.font().pixel_metrics().line_spacing();
return CSSPixels(layout_node.font().pixel_metrics().line_spacing());
if (line_height->is_length()) {
auto line_height_length = line_height->as_length().length();
@ -226,7 +226,7 @@ CSSPixels StyleProperties::line_height(Layout::Node const& layout_node) const
auto resolved = line_height->as_calculated().resolve_number();
if (!resolved.has_value()) {
dbgln("FIXME: Failed to resolve calc() line-height (number): {}", line_height->as_calculated().to_string());
return layout_node.font().pixel_metrics().line_spacing();
return CSSPixels(layout_node.font().pixel_metrics().line_spacing());
}
return Length(resolved.value(), Length::Type::Em).to_px(layout_node);
}
@ -234,12 +234,12 @@ CSSPixels StyleProperties::line_height(Layout::Node const& layout_node) const
auto resolved = line_height->as_calculated().resolve_length(layout_node);
if (!resolved.has_value()) {
dbgln("FIXME: Failed to resolve calc() line-height: {}", line_height->as_calculated().to_string());
return layout_node.font().pixel_metrics().line_spacing();
return CSSPixels(layout_node.font().pixel_metrics().line_spacing());
}
return resolved->to_px(layout_node);
}
return layout_node.font().pixel_metrics().line_spacing();
return CSSPixels(layout_node.font().pixel_metrics().line_spacing());
}
Optional<int> StyleProperties::z_index() const