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Format gfx text #21373

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This commit is contained in:
kingdido999 2018-09-07 10:49:07 +08:00
parent 41a6c0cc39
commit aa4a8eb88d
6 changed files with 420 additions and 266 deletions
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162
components/gfx/text/text_run.rs
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@ -155,7 +155,7 @@ impl<'a> Iterator for CharacterSliceIterator<'a> {
let byte_start = self.range.begin();
let byte_len = match self.text[byte_start.to_usize()..].chars().next() {
Some(ch) => ByteIndex(ch.len_utf8() as isize),
None => unreachable!() // XXX refactor?
None => unreachable!(), // XXX refactor?
};
self.range.adjust_by(byte_len, -byte_len);
@ -178,24 +178,36 @@ impl<'a> Iterator for CharacterSliceIterator<'a> {
impl<'a> TextRun {
/// Constructs a new text run. Also returns if there is a line break at the beginning
pub fn new(font: &mut Font, text: String, options: &ShapingOptions,
bidi_level: bidi::Level, breaker: &mut Option<LineBreakLeafIter>) -> (TextRun, bool) {
pub fn new(
font: &mut Font,
text: String,
options: &ShapingOptions,
bidi_level: bidi::Level,
breaker: &mut Option<LineBreakLeafIter>,
) -> (TextRun, bool) {
let (glyphs, break_at_zero) = TextRun::break_and_shape(font, &text, options, breaker);
(TextRun {
text: Arc::new(text),
font_metrics: font.metrics.clone(),
font_template: font.handle.template(),
font_key: font.font_key,
actual_pt_size: font.actual_pt_size,
glyphs: Arc::new(glyphs),
bidi_level: bidi_level,
extra_word_spacing: Au(0),
}, break_at_zero)
(
TextRun {
text: Arc::new(text),
font_metrics: font.metrics.clone(),
font_template: font.handle.template(),
font_key: font.font_key,
actual_pt_size: font.actual_pt_size,
glyphs: Arc::new(glyphs),
bidi_level: bidi_level,
extra_word_spacing: Au(0),
},
break_at_zero,
)
}
pub fn break_and_shape(font: &mut Font, text: &str, options: &ShapingOptions,
breaker: &mut Option<LineBreakLeafIter>) -> (Vec<GlyphRun>, bool) {
let mut glyphs = vec!();
pub fn break_and_shape(
font: &mut Font,
text: &str,
options: &ShapingOptions,
breaker: &mut Option<LineBreakLeafIter>,
) -> (Vec<GlyphRun>, bool) {
let mut glyphs = vec![];
let mut slice = 0..0;
let mut finished = false;
@ -203,7 +215,7 @@ impl<'a> TextRun {
if breaker.is_none() {
if text.len() == 0 {
return (glyphs, true)
return (glyphs, true);
}
*breaker = Some(LineBreakLeafIter::new(&text, 0));
}
@ -225,29 +237,39 @@ impl<'a> TextRun {
// Split off any trailing whitespace into a separate glyph run.
let mut whitespace = slice.end..slice.end;
if let Some((i, _)) = word.char_indices().rev()
.take_while(|&(_, c)| char_is_whitespace(c)).last() {
whitespace.start = slice.start + i;
slice.end = whitespace.start;
} else if idx != text.len() && options.flags.contains(ShapingFlags::KEEP_ALL_FLAG) {
// If there's no whitespace and word-break is set to
// keep-all, try increasing the slice.
continue;
}
if let Some((i, _)) = word
.char_indices()
.rev()
.take_while(|&(_, c)| char_is_whitespace(c))
.last()
{
whitespace.start = slice.start + i;
slice.end = whitespace.start;
} else if idx != text.len() && options.flags.contains(ShapingFlags::KEEP_ALL_FLAG) {
// If there's no whitespace and word-break is set to
// keep-all, try increasing the slice.
continue;
}
if slice.len() > 0 {
glyphs.push(GlyphRun {
glyph_store: font.shape_text(&text[slice.clone()], options),
range: Range::new(ByteIndex(slice.start as isize),
ByteIndex(slice.len() as isize)),
range: Range::new(
ByteIndex(slice.start as isize),
ByteIndex(slice.len() as isize),
),
});
}
if whitespace.len() > 0 {
let mut options = options.clone();
options.flags.insert(ShapingFlags::IS_WHITESPACE_SHAPING_FLAG);
options
.flags
.insert(ShapingFlags::IS_WHITESPACE_SHAPING_FLAG);
glyphs.push(GlyphRun {
glyph_store: font.shape_text(&text[whitespace.clone()], &options),
range: Range::new(ByteIndex(whitespace.start as isize),
ByteIndex(whitespace.len() as isize)),
range: Range::new(
ByteIndex(whitespace.start as isize),
ByteIndex(whitespace.len() as isize),
),
});
}
slice.start = whitespace.end;
@ -265,36 +287,46 @@ impl<'a> TextRun {
pub fn advance_for_range(&self, range: &Range<ByteIndex>) -> Au {
if range.is_empty() {
return Au(0)
return Au(0);
}
// TODO(Issue #199): alter advance direction for RTL
// TODO(Issue #98): using inter-char and inter-word spacing settings when measuring text
self.natural_word_slices_in_range(range)
.fold(Au(0), |advance, slice| {
advance + slice.glyphs.advance_for_byte_range(&slice.range, self.extra_word_spacing)
advance + slice
.glyphs
.advance_for_byte_range(&slice.range, self.extra_word_spacing)
})
}
pub fn metrics_for_range(&self, range: &Range<ByteIndex>) -> RunMetrics {
RunMetrics::new(self.advance_for_range(range),
self.font_metrics.ascent,
self.font_metrics.descent)
RunMetrics::new(
self.advance_for_range(range),
self.font_metrics.ascent,
self.font_metrics.descent,
)
}
pub fn metrics_for_slice(&self, glyphs: &GlyphStore, slice_range: &Range<ByteIndex>)
-> RunMetrics {
RunMetrics::new(glyphs.advance_for_byte_range(slice_range, self.extra_word_spacing),
self.font_metrics.ascent,
self.font_metrics.descent)
pub fn metrics_for_slice(
&self,
glyphs: &GlyphStore,
slice_range: &Range<ByteIndex>,
) -> RunMetrics {
RunMetrics::new(
glyphs.advance_for_byte_range(slice_range, self.extra_word_spacing),
self.font_metrics.ascent,
self.font_metrics.descent,
)
}
pub fn min_width_for_range(&self, range: &Range<ByteIndex>) -> Au {
debug!("iterating outer range {:?}", range);
self.natural_word_slices_in_range(range).fold(Au(0), |max_piece_width, slice| {
debug!("iterated on {:?}[{:?}]", slice.offset, slice.range);
max(max_piece_width, self.advance_for_range(&slice.range))
})
self.natural_word_slices_in_range(range)
.fold(Au(0), |max_piece_width, slice| {
debug!("iterated on {:?}[{:?}]", slice.offset, slice.range);
max(max_piece_width, self.advance_for_range(&slice.range))
})
}
pub fn minimum_splittable_inline_size(&self, range: &Range<ByteIndex>) -> Au {
@ -309,13 +341,15 @@ impl<'a> TextRun {
let self_ptr = self as *const TextRun;
INDEX_OF_FIRST_GLYPH_RUN_CACHE.with(|index_of_first_glyph_run_cache| {
if let Some((last_text_run, last_index, last_result)) =
index_of_first_glyph_run_cache.get() {
index_of_first_glyph_run_cache.get()
{
if last_text_run == self_ptr && last_index == index {
return Some(last_result)
return Some(last_result);
}
}
if let Ok(result) = (&**self.glyphs).binary_search_by(|current| current.compare(&index)) {
if let Ok(result) = (&**self.glyphs).binary_search_by(|current| current.compare(&index))
{
index_of_first_glyph_run_cache.set(Some((self_ptr, index, result)));
Some(result)
} else {
@ -339,18 +373,22 @@ impl<'a> TextRun {
let mut remaining = advance;
self.natural_word_slices_in_range(range)
.map(|slice| {
let (slice_index, slice_advance) =
slice.glyphs.range_index_of_advance(&slice.range, remaining, self.extra_word_spacing);
let (slice_index, slice_advance) = slice.glyphs.range_index_of_advance(
&slice.range,
remaining,
self.extra_word_spacing,
);
remaining -= slice_advance;
slice_index
})
.sum()
}).sum()
}
/// Returns an iterator that will iterate over all slices of glyphs that represent natural
/// words in the given range.
pub fn natural_word_slices_in_range(&'a self, range: &Range<ByteIndex>)
-> NaturalWordSliceIterator<'a> {
pub fn natural_word_slices_in_range(
&'a self,
range: &Range<ByteIndex>,
) -> NaturalWordSliceIterator<'a> {
let index = match self.index_of_first_glyph_run_containing(range.begin()) {
None => self.glyphs.len(),
Some(index) => index,
@ -365,20 +403,22 @@ impl<'a> TextRun {
/// Returns an iterator that over natural word slices in visual order (left to right or
/// right to left, depending on the bidirectional embedding level).
pub fn natural_word_slices_in_visual_order(&'a self, range: &Range<ByteIndex>)
-> NaturalWordSliceIterator<'a> {
pub fn natural_word_slices_in_visual_order(
&'a self,
range: &Range<ByteIndex>,
) -> NaturalWordSliceIterator<'a> {
// Iterate in reverse order if bidi level is RTL.
let reverse = self.bidi_level.is_rtl();
let index = if reverse {
match self.index_of_first_glyph_run_containing(range.end() - ByteIndex(1)) {
Some(i) => i + 1, // In reverse mode, index points one past the next element.
None => 0
None => 0,
}
} else {
match self.index_of_first_glyph_run_containing(range.begin()) {
Some(i) => i,
None => self.glyphs.len()
None => self.glyphs.len(),
}
};
NaturalWordSliceIterator {
@ -391,8 +431,10 @@ impl<'a> TextRun {
/// Returns an iterator that will iterate over all slices of glyphs that represent individual
/// characters in the given range.
pub fn character_slices_in_range(&'a self, range: &Range<ByteIndex>)
-> CharacterSliceIterator<'a> {
pub fn character_slices_in_range(
&'a self,
range: &Range<ByteIndex>,
) -> CharacterSliceIterator<'a> {
let index = match self.index_of_first_glyph_run_containing(range.begin()) {
None => self.glyphs.len(),
Some(index) => index,