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LibWeb: Resolve % min-sizes against 0 while under min-content constraint

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When resolving a percentage min-width or min-height size against a
containing block currently under a min-content constraint, we should act
as if the containing block has zero size in that axis.
This commit is contained in:
Andreas Kling 2023-06-16 13:46:55 +02:00
parent 1578121dcb
commit a988241f3f
Notes: sideshowbarker 2024-07-17 07:25:39 +09:00
7 changed files with 43 additions and 24 deletions
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6
Tests/LibWeb/Layout/expected/img-with-percentage-max-width-and-min-content-containing-block-width.txt Normal file
View file

@ -0,0 +1,6 @@
Viewport <#document> at (0,0) content-size 800x600 children: not-inline
BlockContainer <html> at (0,0) content-size 800x33.46875 [BFC] children: not-inline
BlockContainer <body> at (8,8) content-size 0x17.46875 children: inline
line 0 width: 0, height: 17.46875, bottom: 17.46875, baseline: 13.53125
frag 0 from ImageBox start: 0, length: 0, rect: [8,21 0x0]
ImageBox <img> at (8,21) content-size 0x0 children: not-inline

4
Tests/LibWeb/Layout/input/img-with-percentage-max-width-and-min-content-containing-block-width.html Normal file
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@ -0,0 +1,4 @@
<!DOCTYPE html><style>
body { width: min-content; }
img { max-width: 100%; }
</style><body><img src="120.png">

6
Userland/Libraries/LibWeb/Layout/BlockFormattingContext.cpp
View file

@ -253,7 +253,7 @@ void BlockFormattingContext::compute_width(Box const& box, AvailableSpace const&
// 2. The tentative used width is greater than 'max-width', the rules above are applied again,
// but this time using the computed value of 'max-width' as the computed value for 'width'.
if (!should_treat_max_width_as_none(box)) {
if (!should_treat_max_width_as_none(box, available_space.width)) {
auto max_width = calculate_inner_width(box, remaining_available_space.width, computed_values.max_width());
auto used_width_px = used_width.is_auto() ? remaining_available_space.width.to_px() : used_width.to_px(box);
if (used_width_px > max_width.to_px(box)) {
@ -331,7 +331,7 @@ void BlockFormattingContext::compute_width_for_floating_box(Box const& box, Avai
// 2. The tentative used width is greater than 'max-width', the rules above are applied again,
// but this time using the computed value of 'max-width' as the computed value for 'width'.
if (!should_treat_max_width_as_none(box)) {
if (!should_treat_max_width_as_none(box, available_space.width)) {
auto max_width = calculate_inner_width(box, available_space.width, computed_values.max_width());
if (width.to_px(box) > max_width.to_px(box))
width = compute_width(max_width);
@ -458,7 +458,7 @@ void BlockFormattingContext::compute_height(Box const& box, AvailableSpace const
}
}
if (!should_treat_max_height_as_none(box)) {
if (!should_treat_max_height_as_none(box, available_space.height)) {
auto max_height = calculate_inner_height(box, available_space.height, computed_values.max_height());
if (!max_height.is_auto())
height = min(height, max_height.to_px(box));

37
Userland/Libraries/LibWeb/Layout/FormattingContext.cpp
View file

@ -256,7 +256,7 @@ FormattingContext::ShrinkToFitResult FormattingContext::calculate_shrink_to_fit_
};
}
CSSPixelSize FormattingContext::solve_replaced_size_constraint(CSSPixels input_width, CSSPixels input_height, Box const& box) const
CSSPixelSize FormattingContext::solve_replaced_size_constraint(CSSPixels input_width, CSSPixels input_height, Box const& box, AvailableSpace const& available_space) const
{
// 10.4 Minimum and maximum widths: 'min-width' and 'max-width'
@ -266,9 +266,9 @@ CSSPixelSize FormattingContext::solve_replaced_size_constraint(CSSPixels input_w
auto height_of_containing_block = containing_block_state.content_height();
CSSPixels specified_min_width = box.computed_values().min_width().is_auto() ? 0 : box.computed_values().min_width().to_px(box, width_of_containing_block);
CSSPixels specified_max_width = should_treat_max_width_as_none(box) ? input_width : box.computed_values().max_width().to_px(box, width_of_containing_block);
CSSPixels specified_max_width = should_treat_max_width_as_none(box, available_space.width) ? input_width : box.computed_values().max_width().to_px(box, width_of_containing_block);
CSSPixels specified_min_height = box.computed_values().min_height().is_auto() ? 0 : box.computed_values().min_height().to_px(box, height_of_containing_block);
CSSPixels specified_max_height = should_treat_max_height_as_none(box) ? input_height : box.computed_values().max_height().to_px(box, height_of_containing_block);
CSSPixels specified_max_height = should_treat_max_height_as_none(box, available_space.height) ? input_height : box.computed_values().max_height().to_px(box, height_of_containing_block);
auto min_width = min(specified_min_width, specified_max_width);
auto max_width = max(specified_min_width, specified_max_width);
@ -446,13 +446,13 @@ CSSPixels FormattingContext::compute_width_for_replaced_element(Box const& box,
if (computed_width.is_auto() && computed_height.is_auto() && box.has_preferred_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();
used_width = solve_replaced_size_constraint(w, h, box, available_space).width();
return used_width;
}
// 2. The tentative used width is greater than 'max-width', the rules above are applied again,
// but this time using the computed value of 'max-width' as the computed value for 'width'.
if (!should_treat_max_width_as_none(box)) {
if (!should_treat_max_width_as_none(box, available_space.width)) {
auto const& computed_max_width = box.computed_values().max_width();
if (used_width > computed_max_width.to_px(box, width_of_containing_block)) {
used_width = tentative_width_for_replaced_element(box, computed_max_width, available_space);
@ -521,13 +521,13 @@ CSSPixels FormattingContext::compute_height_for_replaced_element(Box const& box,
if (computed_width.is_auto() && computed_height.is_auto() && box.has_preferred_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();
used_height = solve_replaced_size_constraint(w, h, box, available_space).height();
return used_height;
}
// 2. If this tentative height is greater than 'max-height', the rules above are applied again,
// but this time using the value of 'max-height' as the computed value for 'height'.
if (!should_treat_max_height_as_none(box)) {
if (!should_treat_max_height_as_none(box, available_space.height)) {
auto const& computed_max_height = box.computed_values().max_height();
if (used_height > computed_max_height.to_px(box, height_of_containing_block)) {
used_height = tentative_height_for_replaced_element(box, computed_max_height, available_space);
@ -688,7 +688,7 @@ void FormattingContext::compute_width_for_absolutely_positioned_non_replaced_ele
// 2. The tentative used width is greater than 'max-width', the rules above are applied again,
// but this time using the computed value of 'max-width' as the computed value for 'width'.
if (!should_treat_max_width_as_none(box)) {
if (!should_treat_max_width_as_none(box, available_space.width)) {
auto max_width = calculate_inner_width(box, available_space.width, computed_values.max_width());
if (used_width.to_px(box) > max_width.to_px(box)) {
used_width = try_compute_width(max_width);
@ -1655,19 +1655,24 @@ bool box_is_sized_as_replaced_element(Box const& box)
return is<ReplacedBox>(box) || box.has_preferred_aspect_ratio();
}
bool FormattingContext::should_treat_max_width_as_none(Box const& box) const
bool FormattingContext::should_treat_max_width_as_none(Box const& box, AvailableSize const& available_width) const
{
auto const& max_width = box.computed_values().max_width();
if (max_width.is_none())
return true;
if (box.is_absolutely_positioned())
return false;
if (max_width.contains_percentage() && !m_state.get(*box.non_anonymous_containing_block()).has_definite_width())
return true;
if (max_width.contains_percentage()) {
if (available_width.is_min_content())
return false;
if (!m_state.get(*box.non_anonymous_containing_block()).has_definite_width())
return true;
}
return false;
}
bool FormattingContext::should_treat_max_height_as_none(Box const& box) const
bool FormattingContext::should_treat_max_height_as_none(Box const& box, AvailableSize const& available_height) const
{
// https://www.w3.org/TR/CSS22/visudet.html#min-max-heights
// If the height of the containing block is not specified explicitly (i.e., it depends on content height),
@ -1678,8 +1683,12 @@ bool FormattingContext::should_treat_max_height_as_none(Box const& box) const
return true;
if (box.is_absolutely_positioned())
return false;
if (max_height.contains_percentage() && !m_state.get(*box.non_anonymous_containing_block()).has_definite_height())
return true;
if (max_height.contains_percentage()) {
if (available_height.is_min_content())
return false;
if (!m_state.get(*box.non_anonymous_containing_block()).has_definite_height())
return true;
}
return false;
}

6
Userland/Libraries/LibWeb/Layout/FormattingContext.h
View file

@ -99,8 +99,8 @@ protected:
static bool should_treat_width_as_auto(Box const&, AvailableSpace const&);
static bool should_treat_height_as_auto(Box const&, AvailableSpace const&);
[[nodiscard]] bool should_treat_max_width_as_none(Box const&) const;
[[nodiscard]] bool should_treat_max_height_as_none(Box const&) const;
[[nodiscard]] bool should_treat_max_width_as_none(Box const&, AvailableSize const&) const;
[[nodiscard]] bool should_treat_max_height_as_none(Box const&, AvailableSize const&) const;
OwnPtr<FormattingContext> layout_inside(Box const&, LayoutMode, AvailableSpace const&);
void compute_inset(Box const& box);
@ -129,7 +129,7 @@ protected:
CSSPixels tentative_height_for_replaced_element(Box const&, CSS::Size const& computed_height, AvailableSpace const&) const;
CSSPixels compute_auto_height_for_block_formatting_context_root(Box const&) const;
[[nodiscard]] CSSPixelSize solve_replaced_size_constraint(CSSPixels input_width, CSSPixels input_height, Box const&) const;
[[nodiscard]] CSSPixelSize solve_replaced_size_constraint(CSSPixels input_width, CSSPixels input_height, Box const&, AvailableSpace const&) const;
ShrinkToFitResult calculate_shrink_to_fit_widths(Box const&);

2
Userland/Libraries/LibWeb/Layout/InlineFormattingContext.cpp
View file

@ -149,7 +149,7 @@ void InlineFormattingContext::dimension_box_on_line(Box const& box, LayoutMode l
}
CSSPixels width = unconstrained_width;
if (!should_treat_max_width_as_none(box)) {
if (!should_treat_max_width_as_none(box, m_available_space->width)) {
auto max_width = box.computed_values().max_width().to_px(box, width_of_containing_block);
width = min(width, max_width);
}

6
Userland/Libraries/LibWeb/Layout/TableFormattingContext.cpp
View file

@ -186,9 +186,9 @@ void TableFormattingContext::compute_cell_measures(AvailableSpace const& availab
CSSPixels max_height = computed_values.height().is_auto() ? max_content_height : height;
CSSPixels max_width = computed_values.width().is_auto() ? max_content_width : width;
if (!should_treat_max_height_as_none(cell.box))
if (!should_treat_max_height_as_none(cell.box, available_space.height))
max_height = min(max_height, computed_values.max_height().to_px(cell.box, containing_block.content_height()));
if (!should_treat_max_width_as_none(cell.box))
if (!should_treat_max_width_as_none(cell.box, available_space.width))
max_width = min(max_width, computed_values.max_width().to_px(cell.box, containing_block.content_width()));
if (computed_values.height().is_percentage()) {
@ -355,7 +355,7 @@ void TableFormattingContext::compute_table_width()
// of resolved-table-width, and the used min-width of the table.
CSSPixels resolved_table_width = computed_values.width().to_px(table_box(), width_of_table_wrapper_containing_block);
used_width = max(resolved_table_width, used_min_width);
if (!should_treat_max_width_as_none(table_box()))
if (!should_treat_max_width_as_none(table_box(), m_available_space->width))
used_width = min(used_width, computed_values.max_width().to_px(table_box(), width_of_table_wrapper_containing_block));
}