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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
Notes: sideshowbarker 2024-07-17 03:45:48 +09:00 
Author: https://github.com/kalenikaliaksandr
Commit: https://github.com/SerenityOS/serenity/commit/147c3b3d97
Pull-request: https://github.com/SerenityOS/serenity/pull/19368
Reviewed-by: https://github.com/MacDue
43 changed files with 340 additions and 220 deletions
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8
Userland/Libraries/LibWeb/Layout/LineBuilder.cpp
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@@ -136,7 +136,7 @@ CSSPixels LineBuilder::y_for_float_to_be_inserted_here(Box const& box)
bool LineBuilder::should_break(CSSPixels next_item_width)
{
if (!isfinite(m_available_width_for_current_line.value()))
if (!isfinite(m_available_width_for_current_line.to_double()))
return false;
auto const& line_boxes = m_containing_block_state.line_boxes;
@@ -228,7 +228,7 @@ void LineBuilder::update_last_line()
if (length_percentage->is_length())
fragment_baseline += length_percentage->length().to_px(fragment.layout_node());
else if (length_percentage->is_percentage())
fragment_baseline += static_cast<double>(length_percentage->percentage().as_fraction()) * line_height;
fragment_baseline += length_percentage->percentage().as_fraction() * line_height.to_double();
}
line_box_baseline = max(line_box_baseline, fragment_baseline);
@@ -282,7 +282,7 @@ void LineBuilder::update_last_line()
auto vertical_align_amount = length_percentage->length().to_px(fragment.layout_node());
new_fragment_y = y_value_for_alignment(CSS::VerticalAlign::Baseline) - vertical_align_amount;
} else if (length_percentage->is_percentage()) {
auto vertical_align_amount = static_cast<double>(length_percentage->percentage().as_fraction()) * m_context.containing_block().line_height();
auto vertical_align_amount = length_percentage->percentage().as_fraction() * m_context.containing_block().line_height().to_double();
new_fragment_y = y_value_for_alignment(CSS::VerticalAlign::Baseline) - vertical_align_amount;
}
}
@@ -310,7 +310,7 @@ void LineBuilder::update_last_line()
if (length_percentage->is_length())
bottom_of_inline_box += length_percentage->length().to_px(fragment.layout_node());
else if (length_percentage->is_percentage())
bottom_of_inline_box += static_cast<double>(length_percentage->percentage().as_fraction()) * m_context.containing_block().line_height();
bottom_of_inline_box += length_percentage->percentage().as_fraction() * m_context.containing_block().line_height().to_double();
}
}