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layout: Add initial support for text-transform (#31396)

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This adds basic support for `text-transform` in a way that is more
complete than legacy layout. There are still many missing elements of
proper `text-transform` support such as:

1. Support for `full-width` and `full-size-kana`
2. Support for grapheme based uppercasing, lowercasing, and
   capitalization. These are all done per-code point right now.
3. Support for the language-specific `SpecialCasing.txt` cases for case
   mapping such as the ones for Irish and Turkish.

Co-authored-by: Rakhi Sharma <atbrakhi@igalia.com>
This commit is contained in:
Martin Robinson 2024-02-22 15:15:59 +01:00 • committed by GitHub
parent f60e5e767b
commit d8b326528b
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GPG key ID: B5690EEEBB952194
105 changed files with 181 additions and 292 deletions
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5
components/layout_2020/flow/inline.rs
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@ -1578,6 +1578,9 @@ impl InlineFormattingContext {
// > (It is invisible, but retains its soft wrap opportunity, if any.)
let mut last_inline_box_ended_with_white_space = false;
// For the purposes of `text-transform: capitalize` the start of the IFC is a word boundary.
let mut on_word_boundary = true;
crate::context::with_thread_local_font_context(layout_context, |font_context| {
let mut linebreaker = None;
self.foreach(|iter_item| match iter_item {
@ -1589,6 +1592,7 @@ impl InlineFormattingContext {
&mut linebreaker,
&mut ifc_fonts,
&mut last_inline_box_ended_with_white_space,
&mut on_word_boundary,
);
},
InlineFormattingContextIterItem::Item(InlineLevelBox::InlineBox(inline_box)) => {
@ -1601,6 +1605,7 @@ impl InlineFormattingContext {
},
InlineFormattingContextIterItem::Item(InlineLevelBox::Atomic(_)) => {
last_inline_box_ended_with_white_space = false;
on_word_boundary = true;
},
_ => {},
});