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Adjust layout_str to use byte coordinates

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* Interpret ranges as byte ranges for incoming runs
* Return glyphs whose indices are byte offsets
This commit is contained in:
Max Brunsfeld
2021-05-20 12:47:08 +02:00
committed by Antonio Scandurra
parent a2c36fcdb7
commit 92b938f4a8
3 changed files with 60 additions and 50 deletions
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gpui/src/elements/label.rs
+1 -1
View File
@@ -73,7 +73,7 @@ impl Element for Label {
.font_cache
.select_font(self.family_id, &self.font_properties)
.unwrap();
let text_len = self.text.chars().count();
let text_len = self.text.len();
let mut styles;
let mut colors;
if let Some(highlights) = self.highlights.as_ref() {
gpui/src/platform/mac/fonts.rs
+58 -48
View File
@@ -189,49 +189,60 @@ impl FontSystemState {
) -> Line {
let font_id_attr_name = CFString::from_static_string("zed_font_id");
let len = text.len();
let mut utf8_and_utf16_ixs = text.char_indices().chain(Some((len, '\0'))).map({
let mut utf16_ix = 0;
move |(utf8_ix, c)| {
let result = (utf8_ix, utf16_ix);
utf16_ix += c.len_utf16();
result
}
});
// Construct the attributed string, converting UTF8 ranges to UTF16 ranges.
let mut string = CFMutableAttributedString::new();
string.replace_str(&CFString::new(text), CFRange::init(0, 0));
{
let mut utf8_and_utf16_ixs = utf8_and_utf16_ixs.clone();
string.replace_str(&CFString::new(text), CFRange::init(0, 0));
let mut utf16_lens = text.chars().map(|c| c.len_utf16());
let mut prev_char_ix = 0;
let mut prev_utf16_ix = 0;
let mut utf8_ix = 0;
let mut utf16_ix = 0;
for (range, font_id) in runs {
while utf8_ix < range.start {
let (next_utf8_ix, next_utf16_ix) = utf8_and_utf16_ixs.next().unwrap();
utf8_ix = next_utf8_ix;
utf16_ix = next_utf16_ix;
}
let utf16_start = utf16_ix;
while utf8_ix < range.end {
let (next_utf8_ix, next_utf16_ix) = utf8_and_utf16_ixs.next().unwrap();
utf8_ix = next_utf8_ix;
utf16_ix = next_utf16_ix;
}
for (range, font_id) in runs {
let utf16_start = prev_utf16_ix
+ utf16_lens
.by_ref()
.take(range.start - prev_char_ix)
.sum::<usize>();
let utf16_end = utf16_start
+ utf16_lens
.by_ref()
.take(range.end - range.start)
.sum::<usize>();
prev_char_ix = range.end;
prev_utf16_ix = utf16_end;
let cf_range = CFRange::init(utf16_start as isize, (utf16_end - utf16_start) as isize);
let font = &self.fonts[font_id.0];
unsafe {
string.set_attribute(
cf_range,
kCTFontAttributeName,
&font.native_font().clone_with_font_size(font_size as f64),
);
string.set_attribute(
cf_range,
font_id_attr_name.as_concrete_TypeRef(),
&CFNumber::from(font_id.0 as i64),
);
let cf_range =
CFRange::init(utf16_start as isize, (utf16_ix - utf16_start) as isize);
let font = &self.fonts[font_id.0];
unsafe {
string.set_attribute(
cf_range,
kCTFontAttributeName,
&font.native_font().clone_with_font_size(font_size as f64),
);
string.set_attribute(
cf_range,
font_id_attr_name.as_concrete_TypeRef(),
&CFNumber::from(font_id.0 as i64),
);
}
}
}
// Retrieve the glyphs from the shaped line, converting UTF16 offsets to UTF8 offsets.
let line = CTLine::new_with_attributed_string(string.as_concrete_TypeRef());
let mut utf16_chars = text.encode_utf16();
let mut char_ix = 0;
let mut prev_utf16_ix = 0;
let mut utf8_ix = 0;
let mut utf16_ix = 0;
let mut runs = Vec::new();
for run in line.glyph_runs().into_iter() {
let font_id = FontId(
@@ -245,21 +256,22 @@ impl FontSystemState {
);
let mut glyphs = Vec::new();
for ((glyph_id, position), utf16_ix) in run
for ((glyph_id, position), glyph_utf16_ix) in run
.glyphs()
.iter()
.zip(run.positions().iter())
.zip(run.string_indices().iter())
{
let utf16_ix = usize::try_from(*utf16_ix).unwrap();
char_ix +=
char::decode_utf16(utf16_chars.by_ref().take(utf16_ix - prev_utf16_ix)).count();
prev_utf16_ix = utf16_ix;
let glyph_utf16_ix = usize::try_from(*glyph_utf16_ix).unwrap();
while utf16_ix < glyph_utf16_ix {
let (next_utf8_ix, next_utf16_ix) = utf8_and_utf16_ixs.next().unwrap();
utf8_ix = next_utf8_ix;
utf16_ix = next_utf16_ix;
}
glyphs.push(Glyph {
id: *glyph_id as GlyphId,
position: vec2f(position.x as f32, position.y as f32),
index: char_ix,
index: utf8_ix,
});
}
@@ -273,7 +285,7 @@ impl FontSystemState {
descent: typographic_bounds.descent as f32,
runs,
font_size,
len: char_ix + 1,
len,
}
}
}
@@ -312,7 +324,7 @@ mod tests {
}
#[test]
fn test_char_indices() -> anyhow::Result<()> {
fn test_glyph_offsets() -> anyhow::Result<()> {
let fonts = FontSystem::new();
let zapfino = fonts.load_family("Zapfino")?;
let zapfino_regular = fonts.select_font(&zapfino, &Properties::new())?;
@@ -326,7 +338,7 @@ mod tests {
&[
(0..9, zapfino_regular),
(9..22, menlo_regular),
(22..text.encode_utf16().count(), zapfino_regular),
(22..text.len(), zapfino_regular),
],
);
assert_eq!(
@@ -335,9 +347,7 @@ mod tests {
.flat_map(|r| r.glyphs.iter())
.map(|g| g.index)
.collect::<Vec<_>>(),
vec![
0, 2, 4, 5, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 30, 31
]
vec![0, 2, 4, 5, 7, 8, 9, 10, 14, 15, 16, 17, 21, 22, 23, 24, 26, 27, 28, 29, 36, 37],
);
Ok(())
}
zed/src/editor/buffer_view.rs
+1 -1
View File
@@ -2151,7 +2151,7 @@ impl BufferView {
layouts.push(layout_cache.layout_str(
&line,
font_size,
&[(0..line.chars().count(), font_id)],
&[(0..line.len(), font_id)],
));
line.clear();
row += 1;