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LibWeb: Exclude trailing whitespace from line width when placing floats

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When generating line boxes, we place floats simultaneously with the
other items on the same line. The CSS text spec requires us to trim the
whitespace at the end of each line, but we only did so after laying out
all the line boxes.

This changes the way we calculate the current line box width for floats
by subtracting the amount of pixels that the current trailing whitespace
is using.

Fixes #4050.
This commit is contained in:
Jelle Raaijmakers 2025-03-26 16:11:50 +00:00
commit 002e79a658
Notes: github-actions[bot] 2025-03-26 19:36:31 +00:00
5 changed files with 99 additions and 19 deletions
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55
Libraries/LibWeb/Layout/LineBox.cpp
View file

@ -5,7 +5,6 @@
*/
#include <AK/CharacterTypes.h>
#include <AK/TypeCasts.h>
#include <AK/Utf8View.h>
#include <LibWeb/DOM/Position.h>
#include <LibWeb/Layout/Box.h>
@ -54,50 +53,70 @@ void LineBox::add_fragment(Node const& layout_node, int start, int length, CSSPi
m_block_length = max(m_block_length, content_height + border_box_top + border_box_bottom);
}
void LineBox::trim_trailing_whitespace()
CSSPixels LineBox::calculate_or_trim_trailing_whitespace(RemoveTrailingWhitespace should_remove)
{
auto should_trim = [](LineBoxFragment* fragment) {
auto ws = fragment->layout_node().computed_values().white_space();
return ws == CSS::WhiteSpace::Normal || ws == CSS::WhiteSpace::Nowrap || ws == CSS::WhiteSpace::PreLine;
};
CSSPixels whitespace_width = 0;
LineBoxFragment* last_fragment = nullptr;
size_t fragment_index = m_fragments.size();
for (;;) {
if (m_fragments.is_empty())
return;
// last_fragment cannot be null from here on down, as m_fragments is not empty.
last_fragment = &m_fragments.last();
if (fragment_index == 0)
return whitespace_width;
last_fragment = &m_fragments[--fragment_index];
auto const* dom_node = last_fragment->layout_node().dom_node();
if (dom_node) {
auto cursor_position = dom_node->document().cursor_position();
if (cursor_position && cursor_position->node() == dom_node)
return;
return whitespace_width;
}
if (!should_trim(last_fragment))
return;
if (last_fragment->is_justifiable_whitespace()) {
m_inline_length -= last_fragment->inline_length();
m_fragments.remove(m_fragments.size() - 1);
} else {
return whitespace_width;
if (!last_fragment->is_justifiable_whitespace())
break;
whitespace_width += last_fragment->inline_length();
if (should_remove == RemoveTrailingWhitespace::Yes) {
m_inline_length -= last_fragment->inline_length();
m_fragments.remove(fragment_index);
}
}
auto last_text = last_fragment->text();
if (last_text.is_null())
return;
return whitespace_width;
while (last_fragment->length()) {
auto last_character = last_text[last_fragment->length() - 1];
size_t last_fragment_length = last_fragment->length();
while (last_fragment_length) {
auto last_character = last_text[--last_fragment_length];
if (!is_ascii_space(last_character))
break;
auto const& font = last_fragment->glyph_run() ? last_fragment->glyph_run()->font() : last_fragment->layout_node().first_available_font();
int last_character_width = font.glyph_width(last_character);
last_fragment->m_length -= 1;
last_fragment->set_inline_length(last_fragment->inline_length() - last_character_width);
m_inline_length -= last_character_width;
whitespace_width += last_character_width;
if (should_remove == RemoveTrailingWhitespace::Yes) {
last_fragment->m_length -= 1;
last_fragment->set_inline_length(last_fragment->inline_length() - last_character_width);
m_inline_length -= last_character_width;
}
}
return whitespace_width;
}
CSSPixels LineBox::get_trailing_whitespace_width() const
{
return const_cast<LineBox&>(*this).calculate_or_trim_trailing_whitespace(RemoveTrailingWhitespace::No);
}
void LineBox::trim_trailing_whitespace()
{
calculate_or_trim_trailing_whitespace(RemoveTrailingWhitespace::Yes);
}
bool LineBox::is_empty_or_ends_in_whitespace() const