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LibWeb: Move "natural size" concept into Layout::Box

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Having this here instead of in ReplacedBox means we can access it when
figuring out what the "preferred aspect ratio" is.

There's some inconsistency between specs about what this is called, but
they're moving towards referring to this as "natural width/height/
aspect-ratio", so let's copy that terminology.
This commit is contained in:
Sam Atkins 2023-06-08 15:56:28 +01:00 • committed by Andreas Kling
parent 6fd3b39bef
commit 84e7216603
13 changed files with 75 additions and 74 deletions
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52
Userland/Libraries/LibWeb/Layout/FormattingContext.cpp
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@ -378,8 +378,8 @@ CSSPixels FormattingContext::tentative_width_for_replaced_element(ReplacedBox co
// If 'height' and 'width' both have computed values of 'auto' and the element also has an intrinsic width,
// then that intrinsic width is the used value of 'width'.
if (computed_height.is_auto() && computed_width.is_auto() && box.has_intrinsic_width())
return box.intrinsic_width().value();
if (computed_height.is_auto() && computed_width.is_auto() && box.has_natural_width())
return box.natural_width().value();
// If 'height' and 'width' both have computed values of 'auto' and the element has no intrinsic width,
// but does have an intrinsic height and intrinsic ratio;
@ -387,22 +387,22 @@ CSSPixels FormattingContext::tentative_width_for_replaced_element(ReplacedBox co
// 'height' has some other computed value, and the element does have an intrinsic ratio; then the used value of 'width' is:
//
// (used height) * (intrinsic ratio)
if ((computed_height.is_auto() && computed_width.is_auto() && !box.has_intrinsic_width() && box.has_intrinsic_height() && box.has_intrinsic_aspect_ratio())
|| (computed_width.is_auto() && !computed_height.is_auto() && box.has_intrinsic_aspect_ratio())) {
return compute_height_for_replaced_element(box, available_space) * static_cast<double>(box.intrinsic_aspect_ratio().value());
if ((computed_height.is_auto() && computed_width.is_auto() && !box.has_natural_width() && box.has_natural_height() && box.has_natural_aspect_ratio())
|| (computed_width.is_auto() && !computed_height.is_auto() && box.has_natural_aspect_ratio())) {
return compute_height_for_replaced_element(box, available_space) * static_cast<double>(box.natural_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,
// then the used value of 'width' is undefined in CSS 2.2. However, it is suggested that, if the containing block's width does not itself
// depend on the replaced element's width, then the used value of 'width' is calculated from the constraint equation used for block-level,
// non-replaced elements in normal flow.
if (computed_height.is_auto() && computed_width.is_auto() && !box.has_intrinsic_width() && !box.has_intrinsic_height() && box.has_intrinsic_aspect_ratio()) {
if (computed_height.is_auto() && computed_width.is_auto() && !box.has_natural_width() && !box.has_natural_height() && box.has_natural_aspect_ratio()) {
return calculate_stretch_fit_width(box, available_space.width);
}
// Otherwise, if 'width' has a computed value of 'auto', and the element has an intrinsic width, then that intrinsic width is the used value of 'width'.
if (computed_width.is_auto() && box.has_intrinsic_width())
return box.intrinsic_width().value();
if (computed_width.is_auto() && box.has_natural_width())
return box.natural_width().value();
// Otherwise, if 'width' has a computed value of 'auto', but none of the conditions above are met, then the used value of 'width' becomes 300px.
// If 300px is too wide to fit the device, UAs should use the width of the largest rectangle that has a 2:1 ratio and fits the device instead.
@ -443,7 +443,7 @@ CSSPixels FormattingContext::compute_width_for_replaced_element(ReplacedBox cons
// 1. The tentative used width is calculated (without 'min-width' and 'max-width')
auto used_width = tentative_width_for_replaced_element(box, computed_width, available_space);
if (computed_width.is_auto() && computed_height.is_auto() && box.has_intrinsic_aspect_ratio()) {
if (computed_width.is_auto() && computed_height.is_auto() && box.has_natural_aspect_ratio()) {
CSSPixels w = used_width;
CSSPixels h = tentative_height_for_replaced_element(box, computed_height, available_space);
used_width = solve_replaced_size_constraint(w, h, box).width();
@ -477,18 +477,18 @@ CSSPixels FormattingContext::tentative_height_for_replaced_element(ReplacedBox c
{
// If 'height' and 'width' both have computed values of 'auto' and the element also has
// an intrinsic height, then that intrinsic height is the used value of 'height'.
if (should_treat_width_as_auto(box, available_space) && should_treat_height_as_auto(box, available_space) && box.has_intrinsic_height())
return box.intrinsic_height().value();
if (should_treat_width_as_auto(box, available_space) && should_treat_height_as_auto(box, available_space) && box.has_natural_height())
return box.natural_height().value();
// Otherwise, if 'height' has a computed value of 'auto', and the element has an intrinsic ratio then the used value of 'height' is:
//
// (used width) / (intrinsic ratio)
if (computed_height.is_auto() && box.has_intrinsic_aspect_ratio())
return m_state.get(box).content_width() / static_cast<double>(box.intrinsic_aspect_ratio().value());
if (computed_height.is_auto() && box.has_natural_aspect_ratio())
return m_state.get(box).content_width() / static_cast<double>(box.natural_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_intrinsic_height())
return box.intrinsic_height().value();
if (computed_height.is_auto() && box.has_natural_height())
return box.natural_height().value();
// Otherwise, if 'height' has a computed value of 'auto', but none of the conditions above are met,
// then the used value of 'height' must be set to the height of the largest rectangle that has a 2:1 ratio, has a height not greater than 150px,
@ -518,7 +518,7 @@ CSSPixels FormattingContext::compute_height_for_replaced_element(ReplacedBox con
// use the algorithm under 'Minimum and maximum widths'
// https://www.w3.org/TR/CSS22/visudet.html#min-max-widths
// to find the used width and height.
if (computed_width.is_auto() && computed_height.is_auto() && box.has_intrinsic_aspect_ratio()) {
if (computed_width.is_auto() && computed_height.is_auto() && box.has_natural_aspect_ratio()) {
CSSPixels w = tentative_width_for_replaced_element(box, computed_width, available_space);
CSSPixels h = used_height;
used_height = solve_replaced_size_constraint(w, h, box).height();
@ -1150,8 +1150,8 @@ CSSPixels FormattingContext::calculate_fit_content_height(Layout::Box const& box
CSSPixels FormattingContext::calculate_min_content_width(Layout::Box const& box) const
{
if (box.has_intrinsic_width())
return *box.intrinsic_width();
if (box.has_natural_width())
return *box.natural_width();
auto& root_state = m_state.m_root;
@ -1188,8 +1188,8 @@ CSSPixels FormattingContext::calculate_min_content_width(Layout::Box const& box)
CSSPixels FormattingContext::calculate_max_content_width(Layout::Box const& box) const
{
if (box.has_intrinsic_width())
return *box.intrinsic_width();
if (box.has_natural_width())
return *box.natural_width();
auto& root_state = m_state.m_root;
@ -1231,8 +1231,8 @@ CSSPixels FormattingContext::calculate_min_content_height(Layout::Box const& box
if (box.is_block_container() || box.display().is_table_inside())
return calculate_max_content_height(box, available_width);
if (box.has_intrinsic_height())
return *box.intrinsic_height();
if (box.has_natural_height())
return *box.natural_height();
bool is_cacheable = available_width.is_definite() || available_width.is_intrinsic_sizing_constraint();
@ -1283,11 +1283,11 @@ CSSPixels FormattingContext::calculate_min_content_height(Layout::Box const& box
CSSPixels FormattingContext::calculate_max_content_height(Layout::Box const& box, AvailableSize const& available_width) const
{
if (box.has_intrinsic_aspect_ratio() && available_width.is_definite())
return available_width.to_px() / static_cast<double>(*box.intrinsic_aspect_ratio());
if (box.has_natural_aspect_ratio() && available_width.is_definite())
return available_width.to_px() / static_cast<double>(*box.natural_aspect_ratio());
if (box.has_intrinsic_height())
return *box.intrinsic_height();
if (box.has_natural_height())
return *box.natural_height();
bool is_cacheable = available_width.is_definite() || available_width.is_intrinsic_sizing_constraint();