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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/SVGFormattingContext.cpp
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@ -168,12 +168,12 @@ void SVGFormattingContext::run(Box const& box, LayoutMode layout_mode, Available
}
auto view_box = maybe_view_box.value();
auto scale_width = svg_box_state.has_definite_width() ? svg_box_state.content_width().value() / view_box.width : 1;
auto scale_height = svg_box_state.has_definite_height() ? svg_box_state.content_height().value() / view_box.height : 1;
auto scale_width = svg_box_state.has_definite_width() ? svg_box_state.content_width() / view_box.width : 1;
auto scale_height = svg_box_state.has_definite_height() ? svg_box_state.content_height() / view_box.height : 1;
// The initial value for preserveAspectRatio is xMidYMid meet.
auto preserve_aspect_ratio = svg_svg_element.preserve_aspect_ratio().value_or(SVG::PreserveAspectRatio {});
auto viewbox_transform = scale_and_align_viewbox_content(preserve_aspect_ratio, view_box, { scale_width, scale_height }, svg_box_state);
auto viewbox_transform = scale_and_align_viewbox_content(preserve_aspect_ratio, view_box, { scale_width.to_double(), scale_height.to_double() }, svg_box_state);
path_transform = Gfx::AffineTransform {}.translate(viewbox_transform.offset.to_type<double>().to_type<float>()).scale(viewbox_transform.scale_factor, viewbox_transform.scale_factor).translate({ -view_box.min_x, -view_box.min_y }).multiply(path_transform);
viewbox_scale = viewbox_transform.scale_factor;
}