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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/Layout/FormattingContext.cpp
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@ -405,7 +405,7 @@ CSSPixels FormattingContext::tentative_width_for_replaced_element(Box const& box
// (used height) * (intrinsic ratio)
if ((computed_height.is_auto() && computed_width.is_auto() && !box.has_natural_width() && box.has_natural_height() && box.has_preferred_aspect_ratio())
|| (computed_width.is_auto() && !computed_height.is_auto() && box.has_preferred_aspect_ratio())) {
return compute_height_for_replaced_element(box, available_space) * static_cast<double>(box.preferred_aspect_ratio().value());
return compute_height_for_replaced_element(box, available_space).scaled(static_cast<double>(box.preferred_aspect_ratio().value()));
}
// If 'height' and 'width' both have computed values of 'auto' and the element has an intrinsic ratio but no intrinsic height or width,
@ -500,7 +500,7 @@ CSSPixels FormattingContext::tentative_height_for_replaced_element(Box const& bo
//
// (used width) / (intrinsic ratio)
if (computed_height.is_auto() && box.has_preferred_aspect_ratio())
return m_state.get(box).content_width() / static_cast<double>(box.preferred_aspect_ratio().value());
return CSSPixels(m_state.get(box).content_width() / static_cast<double>(box.preferred_aspect_ratio().value()));
// Otherwise, if 'height' has a computed value of 'auto', and the element has an intrinsic height, then that intrinsic height is the used value of 'height'.
if (computed_height.is_auto() && box.has_natural_height())
@ -1051,8 +1051,8 @@ CSSPixelPoint FormattingContext::calculate_static_position(Box const& box) const
// The purpose of this function is to calculate the approximate position that `box`
// would have had if it were position:static.
CSSPixels x = 0.0f;
CSSPixels y = 0.0f;
CSSPixels x = 0;
CSSPixels y = 0;
VERIFY(box.parent());
if (box.parent()->children_are_inline()) {
@ -1403,7 +1403,7 @@ CSSPixels FormattingContext::calculate_min_content_height(Layout::Box const& box
CSSPixels FormattingContext::calculate_max_content_height(Layout::Box const& box, CSSPixels width) const
{
if (box.has_preferred_aspect_ratio())
return width / static_cast<double>(*box.preferred_aspect_ratio());
return CSSPixels(width / static_cast<double>(*box.preferred_aspect_ratio()));
if (box.has_natural_height())
return *box.natural_height();
@ -1711,10 +1711,10 @@ CSSPixels FormattingContext::box_baseline(Box const& box) const
return box_state.content_height() + box_state.margin_box_top();
case CSS::VerticalAlign::TextTop:
// TextTop: Align the top of the box with the top of the parent's content area (see 10.6.1).
return box.computed_values().font_size();
return CSSPixels(box.computed_values().font_size());
case CSS::VerticalAlign::TextBottom:
// TextTop: Align the bottom of the box with the bottom of the parent's content area (see 10.6.1).
return box_state.content_height() - (box.containing_block()->font().pixel_metrics().descent * 2);
return box_state.content_height() - CSSPixels(box.containing_block()->font().pixel_metrics().descent * 2);
default:
break;
}