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Share line breaking state across text runs

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Fixes #874
This commit is contained in:
Manish Goregaokar 2018-01-10 18:08:38 +05:30
parent bda560d01b
commit f3c81fcda8
39 changed files with 160 additions and 76 deletions
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17
components/layout/inline.rs
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@ -554,7 +554,6 @@ impl LineBreaker {
layout_context: &LayoutContext) {
// Undo any whitespace stripping from previous reflows.
fragment.reset_text_range_and_inline_size();
// Determine initial placement for the fragment if we need to.
//
// Also, determine whether we can legally break the line before, or
@ -566,7 +565,21 @@ impl LineBreaker {
self.pending_line.green_zone = line_bounds.size;
false
} else {
fragment.white_space().allow_wrap()
// In case of Foo<span style="...">bar</span>, the line breaker will
// set the "suppress line break before" flag for the second fragment.
//
// In case of Foo<span>bar</span> the second fragment ("bar") will
// start _within_ a glyph run, so we also avoid breaking there
//
// is_on_glyph_run_boundary does a binary search, but this is ok
// because the result will be cached and reused in
// `calculate_split_position` later
if fragment.suppress_line_break_before() ||
!fragment.is_on_glyph_run_boundary() {
false
} else {
fragment.white_space().allow_wrap()
}
};
debug!("LineBreaker: trying to append to line {} \