Struct cosmic_text::AttrsList
source · pub struct AttrsList { /* private fields */ }Expand description
List of text attributes to apply to a line
Implementations§
source§impl AttrsList
impl AttrsList
sourcepub fn new(defaults: Attrs<'_>) -> Self
pub fn new(defaults: Attrs<'_>) -> Self
Create a new attributes list with a set of default Attrs
Examples found in repository?
src/buffer.rs (line 407)
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pub fn set_text(&mut self, text: &str, attrs: Attrs<'a>) {
self.lines.clear();
for line in text.lines() {
self.lines.push(BufferLine::new(line.to_string(), AttrsList::new(attrs)));
}
// Make sure there is always one line
if self.lines.is_empty() {
self.lines.push(BufferLine::new(String::new(), AttrsList::new(attrs)));
}
self.scroll = 0;
self.shape_until_scroll();
}More examples
src/attrs.rs (line 277)
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pub fn split_off(&mut self, index: usize) -> Self {
let mut new = Self::new(self.defaults.as_attrs());
let mut removes = Vec::new();
//get the keys we need to remove or fix.
for span in self.spans.iter() {
if span.0.end <= index {
continue;
} else if span.0.start >= index {
removes.push((span.0.clone(), false));
} else {
removes.push((span.0.clone(), true));
}
}
for (key, resize) in removes {
let (range, attrs) = self.spans.get_key_value(&key.start).map(|v| (v.0.clone(), v.1.clone())).expect("attrs span not found");
self.spans.remove(key);
if resize {
new.spans.insert(
0..range.end - index,
attrs.clone()
);
self.spans.insert(range.start..index, attrs);
} else {
new.spans.insert(
range.start - index..range.end - index,
attrs
);
}
}
new
}src/edit/editor.rs (line 362)
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fn action(&mut self, action: Action) {
let old_cursor = self.cursor;
match action {
Action::Previous => {
let line = &mut self.buffer.lines[self.cursor.line];
if self.cursor.index > 0 {
// Find previous character index
let mut prev_index = 0;
for (i, _) in line.text().grapheme_indices(true) {
if i < self.cursor.index {
prev_index = i;
} else {
break;
}
}
self.cursor.index = prev_index;
self.buffer.set_redraw(true);
} else if self.cursor.line > 0 {
self.cursor.line -= 1;
self.cursor.index = self.buffer.lines[self.cursor.line].text().len();
self.buffer.set_redraw(true);
}
self.cursor_x_opt = None;
},
Action::Next => {
let line = &mut self.buffer.lines[self.cursor.line];
if self.cursor.index < line.text().len() {
for (i, c) in line.text().grapheme_indices(true) {
if i == self.cursor.index {
self.cursor.index += c.len();
self.buffer.set_redraw(true);
break;
}
}
} else if self.cursor.line + 1 < self.buffer.lines.len() {
self.cursor.line += 1;
self.cursor.index = 0;
self.buffer.set_redraw(true);
}
self.cursor_x_opt = None;
},
Action::Left => {
let rtl_opt = self.buffer.lines[self.cursor.line].shape_opt().as_ref().map(|shape| shape.rtl);
if let Some(rtl) = rtl_opt {
if rtl {
self.action(Action::Next);
} else {
self.action(Action::Previous);
}
}
},
Action::Right => {
let rtl_opt = self.buffer.lines[self.cursor.line].shape_opt().as_ref().map(|shape| shape.rtl);
if let Some(rtl) = rtl_opt {
if rtl {
self.action(Action::Previous);
} else {
self.action(Action::Next);
}
}
},
Action::Up => {
//TODO: make this preserve X as best as possible!
let mut cursor = self.buffer.layout_cursor(&self.cursor);
if self.cursor_x_opt.is_none() {
self.cursor_x_opt = Some(
cursor.glyph as i32 //TODO: glyph x position
);
}
if cursor.layout > 0 {
cursor.layout -= 1;
} else if cursor.line > 0 {
cursor.line -= 1;
cursor.layout = usize::max_value();
}
if let Some(cursor_x) = self.cursor_x_opt {
cursor.glyph = cursor_x as usize; //TODO: glyph x position
}
self.set_layout_cursor(cursor);
},
Action::Down => {
//TODO: make this preserve X as best as possible!
let mut cursor = self.buffer.layout_cursor(&self.cursor);
let layout_len = self.buffer.line_layout(cursor.line).expect("layout not found").len();
if self.cursor_x_opt.is_none() {
self.cursor_x_opt = Some(
cursor.glyph as i32 //TODO: glyph x position
);
}
if cursor.layout + 1 < layout_len {
cursor.layout += 1;
} else if cursor.line + 1 < self.buffer.lines.len() {
cursor.line += 1;
cursor.layout = 0;
}
if let Some(cursor_x) = self.cursor_x_opt {
cursor.glyph = cursor_x as usize; //TODO: glyph x position
}
self.set_layout_cursor(cursor);
},
Action::Home => {
let mut cursor = self.buffer.layout_cursor(&self.cursor);
cursor.glyph = 0;
self.set_layout_cursor(cursor);
self.cursor_x_opt = None;
},
Action::End => {
let mut cursor = self.buffer.layout_cursor(&self.cursor);
cursor.glyph = usize::max_value();
self.set_layout_cursor(cursor);
self.cursor_x_opt = None;
}
Action::PageUp => {
//TODO: move cursor
let mut scroll = self.buffer.scroll();
scroll -= self.buffer.visible_lines();
self.buffer.set_scroll(scroll);
},
Action::PageDown => {
//TODO: move cursor
let mut scroll = self.buffer.scroll();
scroll += self.buffer.visible_lines();
self.buffer.set_scroll(scroll);
},
Action::Escape => {
if self.select_opt.take().is_some() {
self.buffer.set_redraw(true);
}
},
Action::Insert(character) => {
if character.is_control()
&& !['\t', '\u{92}'].contains(&character)
{
// Filter out special chars (except for tab), use Action instead
log::debug!("Refusing to insert control character {:?}", character);
} else {
self.delete_selection();
let line = &mut self.buffer.lines[self.cursor.line];
// Collect text after insertion as a line
let after = line.split_off(self.cursor.index);
// Append the inserted text
line.append(BufferLine::new(
character.to_string(),
AttrsList::new(line.attrs_list().defaults() /*TODO: provide attrs?*/)
));
// Append the text after insertion
line.append(after);
self.cursor.index += character.len_utf8();
}
},
Action::Enter => {
self.delete_selection();
let new_line = self.buffer.lines[self.cursor.line].split_off(self.cursor.index);
self.cursor.line += 1;
self.cursor.index = 0;
self.buffer.lines.insert(self.cursor.line, new_line);
},
Action::Backspace => {
if self.delete_selection() {
// Deleted selection
} else if self.cursor.index > 0 {
let line = &mut self.buffer.lines[self.cursor.line];
// Get text line after cursor
let after = line.split_off(self.cursor.index);
// Find previous character index
let mut prev_index = 0;
for (i, _) in line.text().char_indices() {
if i < self.cursor.index {
prev_index = i;
} else {
break;
}
}
self.cursor.index = prev_index;
// Remove character
line.split_off(self.cursor.index);
// Add text after cursor
line.append(after);
} else if self.cursor.line > 0 {
let mut line_index = self.cursor.line;
let old_line = self.buffer.lines.remove(line_index);
line_index -= 1;
let line = &mut self.buffer.lines[line_index];
self.cursor.line = line_index;
self.cursor.index = line.text().len();
line.append(old_line);
}
},
Action::Delete => {
if self.delete_selection() {
// Deleted selection
} else if self.cursor.index < self.buffer.lines[self.cursor.line].text().len() {
let line = &mut self.buffer.lines[self.cursor.line];
let range_opt = line
.text()
.grapheme_indices(true)
.take_while(|(i, _)| *i <= self.cursor.index)
.last()
.map(|(i, c)| {
i..(i + c.len())
});
if let Some(range) = range_opt {
self.cursor.index = range.start;
// Get text after deleted EGC
let after = line.split_off(range.end);
// Delete EGC
line.split_off(range.start);
// Add text after deleted EGC
line.append(after);
}
} else if self.cursor.line + 1 < self.buffer.lines.len() {
let old_line = self.buffer.lines.remove(self.cursor.line + 1);
self.buffer.lines[self.cursor.line].append(old_line);
}
},
Action::Click { x, y } => {
self.select_opt = None;
if let Some(new_cursor) = self.buffer.hit(x, y) {
if new_cursor != self.cursor {
self.cursor = new_cursor;
self.buffer.set_redraw(true);
}
}
},
Action::Drag { x, y } => {
if self.select_opt.is_none() {
self.select_opt = Some(self.cursor);
self.buffer.set_redraw(true);
}
if let Some(new_cursor) = self.buffer.hit(x, y) {
if new_cursor != self.cursor {
self.cursor = new_cursor;
self.buffer.set_redraw(true);
}
}
},
Action::Scroll { lines } => {
let mut scroll = self.buffer.scroll();
scroll += lines;
self.buffer.set_scroll(scroll);
}
}
if old_cursor != self.cursor {
self.cursor_moved = true;
/*TODO
if let Some(glyph) = run.glyphs.get(new_cursor_glyph) {
let font_opt = self.buffer.font_system().get_font(glyph.cache_key.font_id);
let text_glyph = &run.text[glyph.start..glyph.end];
log::debug!(
"{}, {}: '{}' ('{}'): '{}' ({:?})",
self.cursor.line,
self.cursor.index,
font_opt.as_ref().map_or("?", |font| font.info.family.as_str()),
font_opt.as_ref().map_or("?", |font| font.info.post_script_name.as_str()),
text_glyph,
text_glyph
);
}
*/
}
}sourcepub fn defaults(&self) -> Attrs<'_>
pub fn defaults(&self) -> Attrs<'_>
Get the default Attrs
Examples found in repository?
src/buffer_line.rs (line 98)
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pub fn append(&mut self, other: Self) {
let len = self.text.len();
self.text.push_str(other.text());
if other.attrs_list.defaults() != self.attrs_list.defaults() {
// If default formatting does not match, make a new span for it
self.attrs_list.add_span(len..len + other.text().len(), other.attrs_list.defaults());
}
for (other_range, attrs) in other.attrs_list.spans() {
// Add previous attrs spans
let range = other_range.start + len..other_range.end + len;
self.attrs_list.add_span(range, attrs.as_attrs());
}
self.reset();
}More examples
src/shape.rs (line 306)
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pub fn new<'a>(
font_system: &'a FontSystem,
line: &str,
attrs_list: &AttrsList,
word_range: Range<usize>,
level: unicode_bidi::Level,
blank: bool,
) -> Self {
let word = &line[word_range.clone()];
log::trace!(
" Word{}: '{}'",
if blank { " BLANK" } else { "" },
word
);
let mut glyphs = Vec::new();
let span_rtl = level.is_rtl();
let mut start_run = word_range.start;
let mut attrs = attrs_list.defaults();
for (egc_i, _egc) in word.grapheme_indices(true) {
let start_egc = word_range.start + egc_i;
let attrs_egc = attrs_list.get_span(start_egc);
if ! attrs.compatible(&attrs_egc) {
//TODO: more efficient
glyphs.append(&mut shape_run(
font_system,
line,
attrs_list,
start_run,
start_egc,
span_rtl
));
start_run = start_egc;
attrs = attrs_egc;
}
}
if start_run < word_range.end {
//TODO: more efficient
glyphs.append(&mut shape_run(
font_system,
line,
attrs_list,
start_run,
word_range.end,
span_rtl
));
}
let mut x_advance = 0.0;
let mut y_advance = 0.0;
for glyph in &glyphs {
x_advance += glyph.x_advance;
y_advance += glyph.y_advance;
}
Self { blank, glyphs, x_advance, y_advance}
}src/edit/editor.rs (line 362)
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fn action(&mut self, action: Action) {
let old_cursor = self.cursor;
match action {
Action::Previous => {
let line = &mut self.buffer.lines[self.cursor.line];
if self.cursor.index > 0 {
// Find previous character index
let mut prev_index = 0;
for (i, _) in line.text().grapheme_indices(true) {
if i < self.cursor.index {
prev_index = i;
} else {
break;
}
}
self.cursor.index = prev_index;
self.buffer.set_redraw(true);
} else if self.cursor.line > 0 {
self.cursor.line -= 1;
self.cursor.index = self.buffer.lines[self.cursor.line].text().len();
self.buffer.set_redraw(true);
}
self.cursor_x_opt = None;
},
Action::Next => {
let line = &mut self.buffer.lines[self.cursor.line];
if self.cursor.index < line.text().len() {
for (i, c) in line.text().grapheme_indices(true) {
if i == self.cursor.index {
self.cursor.index += c.len();
self.buffer.set_redraw(true);
break;
}
}
} else if self.cursor.line + 1 < self.buffer.lines.len() {
self.cursor.line += 1;
self.cursor.index = 0;
self.buffer.set_redraw(true);
}
self.cursor_x_opt = None;
},
Action::Left => {
let rtl_opt = self.buffer.lines[self.cursor.line].shape_opt().as_ref().map(|shape| shape.rtl);
if let Some(rtl) = rtl_opt {
if rtl {
self.action(Action::Next);
} else {
self.action(Action::Previous);
}
}
},
Action::Right => {
let rtl_opt = self.buffer.lines[self.cursor.line].shape_opt().as_ref().map(|shape| shape.rtl);
if let Some(rtl) = rtl_opt {
if rtl {
self.action(Action::Previous);
} else {
self.action(Action::Next);
}
}
},
Action::Up => {
//TODO: make this preserve X as best as possible!
let mut cursor = self.buffer.layout_cursor(&self.cursor);
if self.cursor_x_opt.is_none() {
self.cursor_x_opt = Some(
cursor.glyph as i32 //TODO: glyph x position
);
}
if cursor.layout > 0 {
cursor.layout -= 1;
} else if cursor.line > 0 {
cursor.line -= 1;
cursor.layout = usize::max_value();
}
if let Some(cursor_x) = self.cursor_x_opt {
cursor.glyph = cursor_x as usize; //TODO: glyph x position
}
self.set_layout_cursor(cursor);
},
Action::Down => {
//TODO: make this preserve X as best as possible!
let mut cursor = self.buffer.layout_cursor(&self.cursor);
let layout_len = self.buffer.line_layout(cursor.line).expect("layout not found").len();
if self.cursor_x_opt.is_none() {
self.cursor_x_opt = Some(
cursor.glyph as i32 //TODO: glyph x position
);
}
if cursor.layout + 1 < layout_len {
cursor.layout += 1;
} else if cursor.line + 1 < self.buffer.lines.len() {
cursor.line += 1;
cursor.layout = 0;
}
if let Some(cursor_x) = self.cursor_x_opt {
cursor.glyph = cursor_x as usize; //TODO: glyph x position
}
self.set_layout_cursor(cursor);
},
Action::Home => {
let mut cursor = self.buffer.layout_cursor(&self.cursor);
cursor.glyph = 0;
self.set_layout_cursor(cursor);
self.cursor_x_opt = None;
},
Action::End => {
let mut cursor = self.buffer.layout_cursor(&self.cursor);
cursor.glyph = usize::max_value();
self.set_layout_cursor(cursor);
self.cursor_x_opt = None;
}
Action::PageUp => {
//TODO: move cursor
let mut scroll = self.buffer.scroll();
scroll -= self.buffer.visible_lines();
self.buffer.set_scroll(scroll);
},
Action::PageDown => {
//TODO: move cursor
let mut scroll = self.buffer.scroll();
scroll += self.buffer.visible_lines();
self.buffer.set_scroll(scroll);
},
Action::Escape => {
if self.select_opt.take().is_some() {
self.buffer.set_redraw(true);
}
},
Action::Insert(character) => {
if character.is_control()
&& !['\t', '\u{92}'].contains(&character)
{
// Filter out special chars (except for tab), use Action instead
log::debug!("Refusing to insert control character {:?}", character);
} else {
self.delete_selection();
let line = &mut self.buffer.lines[self.cursor.line];
// Collect text after insertion as a line
let after = line.split_off(self.cursor.index);
// Append the inserted text
line.append(BufferLine::new(
character.to_string(),
AttrsList::new(line.attrs_list().defaults() /*TODO: provide attrs?*/)
));
// Append the text after insertion
line.append(after);
self.cursor.index += character.len_utf8();
}
},
Action::Enter => {
self.delete_selection();
let new_line = self.buffer.lines[self.cursor.line].split_off(self.cursor.index);
self.cursor.line += 1;
self.cursor.index = 0;
self.buffer.lines.insert(self.cursor.line, new_line);
},
Action::Backspace => {
if self.delete_selection() {
// Deleted selection
} else if self.cursor.index > 0 {
let line = &mut self.buffer.lines[self.cursor.line];
// Get text line after cursor
let after = line.split_off(self.cursor.index);
// Find previous character index
let mut prev_index = 0;
for (i, _) in line.text().char_indices() {
if i < self.cursor.index {
prev_index = i;
} else {
break;
}
}
self.cursor.index = prev_index;
// Remove character
line.split_off(self.cursor.index);
// Add text after cursor
line.append(after);
} else if self.cursor.line > 0 {
let mut line_index = self.cursor.line;
let old_line = self.buffer.lines.remove(line_index);
line_index -= 1;
let line = &mut self.buffer.lines[line_index];
self.cursor.line = line_index;
self.cursor.index = line.text().len();
line.append(old_line);
}
},
Action::Delete => {
if self.delete_selection() {
// Deleted selection
} else if self.cursor.index < self.buffer.lines[self.cursor.line].text().len() {
let line = &mut self.buffer.lines[self.cursor.line];
let range_opt = line
.text()
.grapheme_indices(true)
.take_while(|(i, _)| *i <= self.cursor.index)
.last()
.map(|(i, c)| {
i..(i + c.len())
});
if let Some(range) = range_opt {
self.cursor.index = range.start;
// Get text after deleted EGC
let after = line.split_off(range.end);
// Delete EGC
line.split_off(range.start);
// Add text after deleted EGC
line.append(after);
}
} else if self.cursor.line + 1 < self.buffer.lines.len() {
let old_line = self.buffer.lines.remove(self.cursor.line + 1);
self.buffer.lines[self.cursor.line].append(old_line);
}
},
Action::Click { x, y } => {
self.select_opt = None;
if let Some(new_cursor) = self.buffer.hit(x, y) {
if new_cursor != self.cursor {
self.cursor = new_cursor;
self.buffer.set_redraw(true);
}
}
},
Action::Drag { x, y } => {
if self.select_opt.is_none() {
self.select_opt = Some(self.cursor);
self.buffer.set_redraw(true);
}
if let Some(new_cursor) = self.buffer.hit(x, y) {
if new_cursor != self.cursor {
self.cursor = new_cursor;
self.buffer.set_redraw(true);
}
}
},
Action::Scroll { lines } => {
let mut scroll = self.buffer.scroll();
scroll += lines;
self.buffer.set_scroll(scroll);
}
}
if old_cursor != self.cursor {
self.cursor_moved = true;
/*TODO
if let Some(glyph) = run.glyphs.get(new_cursor_glyph) {
let font_opt = self.buffer.font_system().get_font(glyph.cache_key.font_id);
let text_glyph = &run.text[glyph.start..glyph.end];
log::debug!(
"{}, {}: '{}' ('{}'): '{}' ({:?})",
self.cursor.line,
self.cursor.index,
font_opt.as_ref().map_or("?", |font| font.info.family.as_str()),
font_opt.as_ref().map_or("?", |font| font.info.post_script_name.as_str()),
text_glyph,
text_glyph
);
}
*/
}
}sourcepub fn spans(&self) -> Vec<(&Range<usize>, &AttrsOwned)>
pub fn spans(&self) -> Vec<(&Range<usize>, &AttrsOwned)>
Get the current attribute spans
Examples found in repository?
src/buffer_line.rs (line 103)
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pub fn append(&mut self, other: Self) {
let len = self.text.len();
self.text.push_str(other.text());
if other.attrs_list.defaults() != self.attrs_list.defaults() {
// If default formatting does not match, make a new span for it
self.attrs_list.add_span(len..len + other.text().len(), other.attrs_list.defaults());
}
for (other_range, attrs) in other.attrs_list.spans() {
// Add previous attrs spans
let range = other_range.start + len..other_range.end + len;
self.attrs_list.add_span(range, attrs.as_attrs());
}
self.reset();
}sourcepub fn clear_spans(&mut self)
pub fn clear_spans(&mut self)
Clear the current attribute spans
sourcepub fn add_span(&mut self, range: Range<usize>, attrs: Attrs<'_>)
pub fn add_span(&mut self, range: Range<usize>, attrs: Attrs<'_>)
Add an attribute span, removes any previous matching parts of spans
Examples found in repository?
src/buffer_line.rs (line 100)
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pub fn append(&mut self, other: Self) {
let len = self.text.len();
self.text.push_str(other.text());
if other.attrs_list.defaults() != self.attrs_list.defaults() {
// If default formatting does not match, make a new span for it
self.attrs_list.add_span(len..len + other.text().len(), other.attrs_list.defaults());
}
for (other_range, attrs) in other.attrs_list.spans() {
// Add previous attrs spans
let range = other_range.start + len..other_range.end + len;
self.attrs_list.add_span(range, attrs.as_attrs());
}
self.reset();
}sourcepub fn get_span(&self, index: usize) -> Attrs<'_>
pub fn get_span(&self, index: usize) -> Attrs<'_>
Get the attribute span for an index
This returns a span that contains the index
Examples found in repository?
src/shape.rs (line 57)
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fn shape_fallback(
font: &Font,
line: &str,
attrs_list: &AttrsList,
start_run: usize,
end_run: usize,
span_rtl: bool,
) -> (Vec<ShapeGlyph>, Vec<usize>) {
let run = &line[start_run..end_run];
let font_scale = font.rustybuzz.units_per_em() as f32;
let mut buffer = rustybuzz::UnicodeBuffer::new();
buffer.set_direction(if span_rtl {
rustybuzz::Direction::RightToLeft
} else {
rustybuzz::Direction::LeftToRight
});
buffer.push_str(run);
buffer.guess_segment_properties();
let rtl = matches!(buffer.direction(), rustybuzz::Direction::RightToLeft);
assert_eq!(rtl, span_rtl);
let glyph_buffer = rustybuzz::shape(&font.rustybuzz, &[], buffer);
let glyph_infos = glyph_buffer.glyph_infos();
let glyph_positions = glyph_buffer.glyph_positions();
let mut missing = Vec::new();
let mut glyphs = Vec::with_capacity(glyph_infos.len());
for (info, pos) in glyph_infos.iter().zip(glyph_positions.iter()) {
let x_advance = pos.x_advance as f32 / font_scale;
let y_advance = pos.y_advance as f32 / font_scale;
let x_offset = pos.x_offset as f32 / font_scale;
let y_offset = pos.y_offset as f32 / font_scale;
let start_glyph = start_run + info.cluster as usize;
//println!(" {:?} {:?}", info, pos);
if info.glyph_id == 0 {
missing.push(start_glyph);
}
let attrs = attrs_list.get_span(start_glyph);
glyphs.push(ShapeGlyph {
start: start_glyph,
end: end_run, // Set later
x_advance,
y_advance,
x_offset,
y_offset,
font_id: font.info.id,
glyph_id: info.glyph_id.try_into().expect("failed to cast glyph ID"),
//TODO: color should not be related to shaping
color_opt: attrs.color_opt,
metadata: attrs.metadata,
});
}
// Adjust end of glyphs
if rtl {
for i in 1..glyphs.len() {
let next_start = glyphs[i - 1].start;
let next_end = glyphs[i - 1].end;
let prev = &mut glyphs[i];
if prev.start == next_start {
prev.end = next_end;
} else {
prev.end = next_start;
}
}
} else {
for i in (1..glyphs.len()).rev() {
let next_start = glyphs[i].start;
let next_end = glyphs[i].end;
let prev = &mut glyphs[i - 1];
if prev.start == next_start {
prev.end = next_end;
} else {
prev.end = next_start;
}
}
}
(glyphs, missing)
}
fn shape_run<'a>(
font_system: &'a FontSystem,
line: &str,
attrs_list: &AttrsList,
start_run: usize,
end_run: usize,
span_rtl: bool,
) -> Vec<ShapeGlyph> {
//TODO: use smallvec?
let mut scripts = Vec::new();
for c in line[start_run..end_run].chars() {
match c.script() {
Script::Common |
Script::Inherited |
Script::Latin |
Script::Unknown => (),
script => if ! scripts.contains(&script) {
scripts.push(script);
},
}
}
log::trace!(
" Run {:?}: '{}'",
scripts,
&line[start_run..end_run],
);
let attrs = attrs_list.get_span(start_run);
let font_matches = font_system.get_font_matches(attrs);
let default_families = [font_matches.default_family.as_str()];
let mut font_iter = FontFallbackIter::new(
&font_matches.fonts,
&default_families,
scripts,
font_matches.locale
);
let (mut glyphs, mut missing) = shape_fallback(
font_iter.next().expect("no default font found"),
line,
attrs_list,
start_run,
end_run,
span_rtl,
);
//TODO: improve performance!
while !missing.is_empty() {
let font = match font_iter.next() {
Some(some) => some,
None => break,
};
log::trace!("Evaluating fallback with font '{}'", font.info.family);
let (mut fb_glyphs, fb_missing) = shape_fallback(
font,
line,
attrs_list,
start_run,
end_run,
span_rtl,
);
// Insert all matching glyphs
let mut fb_i = 0;
while fb_i < fb_glyphs.len() {
let start = fb_glyphs[fb_i].start;
let end = fb_glyphs[fb_i].end;
// Skip clusters that are not missing, or where the fallback font is missing
if !missing.contains(&start) || fb_missing.contains(&start) {
fb_i += 1;
continue;
}
let mut missing_i = 0;
while missing_i < missing.len() {
if missing[missing_i] >= start && missing[missing_i] < end {
// println!("No longer missing {}", missing[missing_i]);
missing.remove(missing_i);
} else {
missing_i += 1;
}
}
// Find prior glyphs
let mut i = 0;
while i < glyphs.len() {
if glyphs[i].start >= start && glyphs[i].end <= end {
break;
} else {
i += 1;
}
}
// Remove prior glyphs
while i < glyphs.len() {
if glyphs[i].start >= start && glyphs[i].end <= end {
let _glyph = glyphs.remove(i);
// log::trace!("Removed {},{} from {}", _glyph.start, _glyph.end, i);
} else {
break;
}
}
while fb_i < fb_glyphs.len() {
if fb_glyphs[fb_i].start >= start && fb_glyphs[fb_i].end <= end {
let fb_glyph = fb_glyphs.remove(fb_i);
// log::trace!("Insert {},{} from font {} at {}", fb_glyph.start, fb_glyph.end, font_i, i);
glyphs.insert(i, fb_glyph);
i += 1;
} else {
break;
}
}
}
}
// Debug missing font fallbacks
font_iter.check_missing(&line[start_run..end_run]);
/*
for glyph in glyphs.iter() {
log::trace!("'{}': {}, {}, {}, {}", &line[glyph.start..glyph.end], glyph.x_advance, glyph.y_advance, glyph.x_offset, glyph.y_offset);
}
*/
glyphs
}
/// A shaped glyph
pub struct ShapeGlyph {
pub start: usize,
pub end: usize,
pub x_advance: f32,
pub y_advance: f32,
pub x_offset: f32,
pub y_offset: f32,
pub font_id: fontdb::ID,
pub glyph_id: u16,
pub color_opt: Option<Color>,
pub metadata: usize,
}
impl ShapeGlyph {
fn layout(&self, font_size: i32, x: f32, y: f32, level: unicode_bidi::Level) -> LayoutGlyph {
let x_offset = font_size as f32 * self.x_offset;
let y_offset = font_size as f32 * self.y_offset;
let x_advance = font_size as f32 * self.x_advance;
let (cache_key, x_int, y_int) = CacheKey::new(
self.font_id,
self.glyph_id,
font_size,
(x + x_offset, y - y_offset)
);
LayoutGlyph {
start: self.start,
end: self.end,
x,
w: x_advance,
level,
cache_key,
x_offset,
y_offset,
x_int,
y_int,
color_opt: self.color_opt,
metadata: self.metadata,
}
}
}
/// A shaped word (for word wrapping)
pub struct ShapeWord {
pub blank: bool,
pub glyphs: Vec<ShapeGlyph>,
pub x_advance: f32,
pub y_advance: f32,
}
impl ShapeWord {
pub fn new<'a>(
font_system: &'a FontSystem,
line: &str,
attrs_list: &AttrsList,
word_range: Range<usize>,
level: unicode_bidi::Level,
blank: bool,
) -> Self {
let word = &line[word_range.clone()];
log::trace!(
" Word{}: '{}'",
if blank { " BLANK" } else { "" },
word
);
let mut glyphs = Vec::new();
let span_rtl = level.is_rtl();
let mut start_run = word_range.start;
let mut attrs = attrs_list.defaults();
for (egc_i, _egc) in word.grapheme_indices(true) {
let start_egc = word_range.start + egc_i;
let attrs_egc = attrs_list.get_span(start_egc);
if ! attrs.compatible(&attrs_egc) {
//TODO: more efficient
glyphs.append(&mut shape_run(
font_system,
line,
attrs_list,
start_run,
start_egc,
span_rtl
));
start_run = start_egc;
attrs = attrs_egc;
}
}
if start_run < word_range.end {
//TODO: more efficient
glyphs.append(&mut shape_run(
font_system,
line,
attrs_list,
start_run,
word_range.end,
span_rtl
));
}
let mut x_advance = 0.0;
let mut y_advance = 0.0;
for glyph in &glyphs {
x_advance += glyph.x_advance;
y_advance += glyph.y_advance;
}
Self { blank, glyphs, x_advance, y_advance}
}