Yehowshua/ZIm
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Separate WrappedLines from ShapedLines

Browse source 
ShapedLines are never wrapped, whereas WrappedLines are optionally wrapped if
they are associated with a wrap width. I tried to combine everything because
wrapping is inherently optional for the Text element, but we have a bunch of
APIs that don't make sense on a line that may wrap, so we need a distinct type
for that case.
This commit is contained in:
Nathan Sobo 2023-11-16 20:11:55 -07:00
parent e5ada92b7b
commit 9558da8681
12 changed files with 563 additions and 330 deletions
Download patch file Download diff file Expand all files Collapse all files

2
crates/gpui2/src/element.rs
View file

@ -13,7 +13,7 @@ pub trait Element<V: 'static> {
fn layout(
&mut self,
view_state: &mut V,
previous_element_state: Option<Self::ElementState>,
element_state: Option<Self::ElementState>,
cx: &mut ViewContext<V>,
) -> (LayoutId, Self::ElementState);

191
crates/gpui2/src/elements/text.rs
View file

@ -1,76 +1,39 @@
use crate::{
AnyElement, BorrowWindow, Bounds, Component, Element, LayoutId, Line, Pixels, SharedString,
Size, TextRun, ViewContext,
AnyElement, BorrowWindow, Bounds, Component, Element, ElementId, LayoutId, Pixels,
SharedString, Size, TextRun, ViewContext, WrappedLine,
};
use parking_lot::Mutex;
use parking_lot::{Mutex, MutexGuard};
use smallvec::SmallVec;
use std::{marker::PhantomData, sync::Arc};
use std::{cell::Cell, rc::Rc, sync::Arc};
use util::ResultExt;
impl<V: 'static> Component<V> for SharedString {
fn render(self) -> AnyElement<V> {
Text {
text: self,
runs: None,
state_type: PhantomData,
}
.render()
}
}
impl<V: 'static> Component<V> for &'static str {
fn render(self) -> AnyElement<V> {
Text {
text: self.into(),
runs: None,
state_type: PhantomData,
}
.render()
}
}
// TODO: Figure out how to pass `String` to `child` without this.
// This impl doesn't exist in the `gpui2` crate.
impl<V: 'static> Component<V> for String {
fn render(self) -> AnyElement<V> {
Text {
text: self.into(),
runs: None,
state_type: PhantomData,
}
.render()
}
}
pub struct Text<V> {
pub struct Text {
text: SharedString,
runs: Option<Vec<TextRun>>,
state_type: PhantomData<V>,
}
impl<V: 'static> Text<V> {
/// styled renders text that has different runs of different styles.
/// callers are responsible for setting the correct style for each run.
////
/// For uniform text you can usually just pass a string as a child, and
/// cx.text_style() will be used automatically.
impl Text {
/// Renders text with runs of different styles.
///
/// Callers are responsible for setting the correct style for each run.
/// For text with a uniform style, you can usually avoid calling this constructor
/// and just pass text directly.
pub fn styled(text: SharedString, runs: Vec<TextRun>) -> Self {
Text {
text,
runs: Some(runs),
state_type: Default::default(),
}
}
}
impl<V: 'static> Component<V> for Text<V> {
impl<V: 'static> Component<V> for Text {
fn render(self) -> AnyElement<V> {
AnyElement::new(self)
}
}
impl<V: 'static> Element<V> for Text<V> {
type ElementState = Arc<Mutex<Option<TextElementState>>>;
impl<V: 'static> Element<V> for Text {
type ElementState = TextState;
fn element_id(&self) -> Option<crate::ElementId> {
None
@ -103,7 +66,7 @@ impl<V: 'static> Element<V> for Text<V> {
let element_state = element_state.clone();
move |known_dimensions, _| {
let Some(lines) = text_system
.layout_text(
.shape_text(
&text,
font_size,
&runs[..],
@ -111,30 +74,23 @@ impl<V: 'static> Element<V> for Text<V> {
)
.log_err()
else {
element_state.lock().replace(TextElementState {
element_state.lock().replace(TextStateInner {
lines: Default::default(),
line_height,
});
return Size::default();
};
let line_count = lines
.iter()
.map(|line| line.wrap_count() + 1)
.sum::<usize>();
let size = Size {
width: lines
.iter()
.map(|line| line.layout.width)
.max()
.unwrap()
.ceil(),
height: line_height * line_count,
};
let mut size: Size<Pixels> = Size::default();
for line in &lines {
let line_size = line.size(line_height);
size.height += line_size.height;
size.width = size.width.max(line_size.width);
}
element_state
.lock()
.replace(TextElementState { lines, line_height });
.replace(TextStateInner { lines, line_height });
size
}
@ -165,7 +121,104 @@ impl<V: 'static> Element<V> for Text<V> {
}
}
pub struct TextElementState {
lines: SmallVec<[Line; 1]>,
#[derive(Default, Clone)]
pub struct TextState(Arc<Mutex<Option<TextStateInner>>>);
impl TextState {
fn lock(&self) -> MutexGuard<Option<TextStateInner>> {
self.0.lock()
}
}
struct TextStateInner {
lines: SmallVec<[WrappedLine; 1]>,
line_height: Pixels,
}
struct InteractiveText {
id: ElementId,
text: Text,
}
struct InteractiveTextState {
text_state: TextState,
clicked_range_ixs: Rc<Cell<SmallVec<[usize; 1]>>>,
}
impl<V: 'static> Element<V> for InteractiveText {
type ElementState = InteractiveTextState;
fn element_id(&self) -> Option<ElementId> {
Some(self.id.clone())
}
fn layout(
&mut self,
view_state: &mut V,
element_state: Option<Self::ElementState>,
cx: &mut ViewContext<V>,
) -> (LayoutId, Self::ElementState) {
if let Some(InteractiveTextState {
text_state,
clicked_range_ixs,
}) = element_state
{
let (layout_id, text_state) = self.text.layout(view_state, Some(text_state), cx);
let element_state = InteractiveTextState {
text_state,
clicked_range_ixs,
};
(layout_id, element_state)
} else {
let (layout_id, text_state) = self.text.layout(view_state, None, cx);
let element_state = InteractiveTextState {
text_state,
clicked_range_ixs: Rc::default(),
};
(layout_id, element_state)
}
}
fn paint(
&mut self,
bounds: Bounds<Pixels>,
view_state: &mut V,
element_state: &mut Self::ElementState,
cx: &mut ViewContext<V>,
) {
self.text
.paint(bounds, view_state, &mut element_state.text_state, cx)
}
}
impl<V: 'static> Component<V> for SharedString {
fn render(self) -> AnyElement<V> {
Text {
text: self,
runs: None,
}
.render()
}
}
impl<V: 'static> Component<V> for &'static str {
fn render(self) -> AnyElement<V> {
Text {
text: self.into(),
runs: None,
}
.render()
}
}
// TODO: Figure out how to pass `String` to `child` without this.
// This impl doesn't exist in the `gpui2` crate.
impl<V: 'static> Component<V> for String {
fn render(self) -> AnyElement<V> {
Text {
text: self.into(),
runs: None,
}
.render()
}
}

10
crates/gpui2/src/platform/mac/text_system.rs
View file

@ -343,10 +343,10 @@ impl MacTextSystemState {
// 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));
string.replace_str(&CFString::new(text.as_ref()), CFRange::init(0, 0));
let utf16_line_len = string.char_len() as usize;
let mut ix_converter = StringIndexConverter::new(text);
let mut ix_converter = StringIndexConverter::new(text.as_ref());
for run in font_runs {
let utf8_end = ix_converter.utf8_ix + run.len;
let utf16_start = ix_converter.utf16_ix;
@ -390,7 +390,7 @@ impl MacTextSystemState {
};
let font_id = self.id_for_native_font(font);
let mut ix_converter = StringIndexConverter::new(text);
let mut ix_converter = StringIndexConverter::new(text.as_ref());
let mut glyphs = SmallVec::new();
for ((glyph_id, position), glyph_utf16_ix) in run
.glyphs()
@ -413,11 +413,11 @@ impl MacTextSystemState {
let typographic_bounds = line.get_typographic_bounds();
LineLayout {
runs,
font_size,
width: typographic_bounds.width.into(),
ascent: typographic_bounds.ascent.into(),
descent: typographic_bounds.descent.into(),
runs,
font_size,
len: text.len(),
}
}

1
crates/gpui2/src/style.rs
View file

@ -203,6 +203,7 @@ impl TextStyle {
style: self.font_style,
},
color: self.color,
background_color: None,
underline: self.underline.clone(),
}
}

82
crates/gpui2/src/text_system.rs
View file

@ -3,20 +3,20 @@ mod line;
mod line_layout;
mod line_wrapper;
use anyhow::anyhow;
pub use font_features::*;
pub use line::*;
pub use line_layout::*;
pub use line_wrapper::*;
use smallvec::SmallVec;
use crate::{
px, Bounds, DevicePixels, Hsla, Pixels, PlatformTextSystem, Point, Result, SharedString, Size,
UnderlineStyle,
};
use anyhow::anyhow;
use collections::HashMap;
use core::fmt;
use parking_lot::{Mutex, RwLock, RwLockUpgradableReadGuard};
use smallvec::SmallVec;
use std::{
cmp,
fmt::{Debug, Display, Formatter},
@ -151,13 +151,79 @@ impl TextSystem {
}
}
pub fn layout_text(
pub fn layout_line(
&self,
text: &str,
font_size: Pixels,
runs: &[TextRun],
) -> Result<Arc<LineLayout>> {
let mut font_runs = self.font_runs_pool.lock().pop().unwrap_or_default();
for run in runs.iter() {
let font_id = self.font_id(&run.font)?;
if let Some(last_run) = font_runs.last_mut() {
if last_run.font_id == font_id {
last_run.len += run.len;
continue;
}
}
font_runs.push(FontRun {
len: run.len,
font_id,
});
}
let layout = self
.line_layout_cache
.layout_line(&text, font_size, &font_runs);
font_runs.clear();
self.font_runs_pool.lock().push(font_runs);
Ok(layout)
}
pub fn shape_line(
&self,
text: SharedString,
font_size: Pixels,
runs: &[TextRun],
) -> Result<ShapedLine> {
debug_assert!(
text.find('\n').is_none(),
"text argument should not contain newlines"
);
let mut decoration_runs = SmallVec::<[DecorationRun; 32]>::new();
for run in runs {
if let Some(last_run) = decoration_runs.last_mut() {
if last_run.color == run.color && last_run.underline == run.underline {
last_run.len += run.len as u32;
continue;
}
}
decoration_runs.push(DecorationRun {
len: run.len as u32,
color: run.color,
underline: run.underline.clone(),
});
}
let layout = self.layout_line(text.as_ref(), font_size, runs)?;
Ok(ShapedLine {
layout,
text,
decoration_runs,
})
}
pub fn shape_text(
&self,
text: &str, // todo!("pass a SharedString and preserve it when passed a single line?")
font_size: Pixels,
runs: &[TextRun],
wrap_width: Option<Pixels>,
) -> Result<SmallVec<[Line; 1]>> {
) -> Result<SmallVec<[WrappedLine; 1]>> {
let mut runs = runs.iter().cloned().peekable();
let mut font_runs = self.font_runs_pool.lock().pop().unwrap_or_default();
@ -210,10 +276,11 @@ impl TextSystem {
let layout = self
.line_layout_cache
.layout_line(&line_text, font_size, &font_runs, wrap_width);
lines.push(Line {
.layout_wrapped_line(&line_text, font_size, &font_runs, wrap_width);
lines.push(WrappedLine {
layout,
decorations: decoration_runs,
decoration_runs,
text: SharedString::from(line_text),
});
line_start = line_end + 1; // Skip `\n` character.
@ -384,6 +451,7 @@ pub struct TextRun {
pub len: usize,
pub font: Font,
pub color: Hsla,
pub background_color: Option<Hsla>,
pub underline: Option<UnderlineStyle>,
}

259
crates/gpui2/src/text_system/line.rs
View file

@ -1,5 +1,5 @@
use crate::{
black, point, px, size, BorrowWindow, Bounds, Hsla, Pixels, Point, Result, Size,
black, point, px, BorrowWindow, Bounds, Hsla, LineLayout, Pixels, Point, Result, SharedString,
UnderlineStyle, WindowContext, WrapBoundary, WrappedLineLayout,
};
use derive_more::{Deref, DerefMut};
@ -14,23 +14,17 @@ pub struct DecorationRun {
}
#[derive(Clone, Default, Debug, Deref, DerefMut)]
pub struct Line {
pub struct ShapedLine {
#[deref]
#[deref_mut]
pub(crate) layout: Arc<WrappedLineLayout>,
pub(crate) decorations: SmallVec<[DecorationRun; 32]>,
pub(crate) layout: Arc<LineLayout>,
pub text: SharedString,
pub(crate) decoration_runs: SmallVec<[DecorationRun; 32]>,
}
impl Line {
pub fn size(&self, line_height: Pixels) -> Size<Pixels> {
size(
self.layout.width,
line_height * (self.layout.wrap_boundaries.len() + 1),
)
}
pub fn wrap_count(&self) -> usize {
self.layout.wrap_boundaries.len()
impl ShapedLine {
pub fn len(&self) -> usize {
self.layout.len
}
pub fn paint(
@ -39,75 +33,84 @@ impl Line {
line_height: Pixels,
cx: &mut WindowContext,
) -> Result<()> {
let padding_top =
(line_height - self.layout.layout.ascent - self.layout.layout.descent) / 2.;
let baseline_offset = point(px(0.), padding_top + self.layout.layout.ascent);
paint_line(
origin,
&self.layout,
line_height,
&self.decoration_runs,
None,
&[],
cx,
)?;
let mut style_runs = self.decorations.iter();
let mut wraps = self.layout.wrap_boundaries.iter().peekable();
let mut run_end = 0;
let mut color = black();
let mut current_underline: Option<(Point<Pixels>, UnderlineStyle)> = None;
let text_system = cx.text_system().clone();
Ok(())
}
}
let mut glyph_origin = origin;
let mut prev_glyph_position = Point::default();
for (run_ix, run) in self.layout.layout.runs.iter().enumerate() {
let max_glyph_size = text_system
.bounding_box(run.font_id, self.layout.layout.font_size)?
.size;
#[derive(Clone, Default, Debug, Deref, DerefMut)]
pub struct WrappedLine {
#[deref]
#[deref_mut]
pub(crate) layout: Arc<WrappedLineLayout>,
pub text: SharedString,
pub(crate) decoration_runs: SmallVec<[DecorationRun; 32]>,
}
for (glyph_ix, glyph) in run.glyphs.iter().enumerate() {
glyph_origin.x += glyph.position.x - prev_glyph_position.x;
impl WrappedLine {
pub fn len(&self) -> usize {
self.layout.len()
}
if wraps.peek() == Some(&&WrapBoundary { run_ix, glyph_ix }) {
wraps.next();
if let Some((underline_origin, underline_style)) = current_underline.take() {
cx.paint_underline(
underline_origin,
glyph_origin.x - underline_origin.x,
&underline_style,
)?;
}
pub fn paint(
&self,
origin: Point<Pixels>,
line_height: Pixels,
cx: &mut WindowContext,
) -> Result<()> {
paint_line(
origin,
&self.layout.unwrapped_layout,
line_height,
&self.decoration_runs,
self.wrap_width,
&self.wrap_boundaries,
cx,
)?;
glyph_origin.x = origin.x;
glyph_origin.y += line_height;
}
prev_glyph_position = glyph.position;
Ok(())
}
}
let mut finished_underline: Option<(Point<Pixels>, UnderlineStyle)> = None;
if glyph.index >= run_end {
if let Some(style_run) = style_runs.next() {
if let Some((_, underline_style)) = &mut current_underline {
if style_run.underline.as_ref() != Some(underline_style) {
finished_underline = current_underline.take();
}
}
if let Some(run_underline) = style_run.underline.as_ref() {
current_underline.get_or_insert((
point(
glyph_origin.x,
origin.y
+ baseline_offset.y
+ (self.layout.layout.descent * 0.618),
),
UnderlineStyle {
color: Some(run_underline.color.unwrap_or(style_run.color)),
thickness: run_underline.thickness,
wavy: run_underline.wavy,
},
));
}
fn paint_line(
origin: Point<Pixels>,
layout: &LineLayout,
line_height: Pixels,
decoration_runs: &[DecorationRun],
wrap_width: Option<Pixels>,
wrap_boundaries: &[WrapBoundary],
cx: &mut WindowContext<'_>,
) -> Result<()> {
let padding_top = (line_height - layout.ascent - layout.descent) / 2.;
let baseline_offset = point(px(0.), padding_top + layout.ascent);
let mut decoration_runs = decoration_runs.iter();
let mut wraps = wrap_boundaries.iter().peekable();
let mut run_end = 0;
let mut color = black();
let mut current_underline: Option<(Point<Pixels>, UnderlineStyle)> = None;
let text_system = cx.text_system().clone();
let mut glyph_origin = origin;
let mut prev_glyph_position = Point::default();
for (run_ix, run) in layout.runs.iter().enumerate() {
let max_glyph_size = text_system
.bounding_box(run.font_id, layout.font_size)?
.size;
run_end += style_run.len as usize;
color = style_run.color;
} else {
run_end = self.layout.text.len();
finished_underline = current_underline.take();
}
}
for (glyph_ix, glyph) in run.glyphs.iter().enumerate() {
glyph_origin.x += glyph.position.x - prev_glyph_position.x;
if let Some((underline_origin, underline_style)) = finished_underline {
if wraps.peek() == Some(&&WrapBoundary { run_ix, glyph_ix }) {
wraps.next();
if let Some((underline_origin, underline_style)) = current_underline.take() {
cx.paint_underline(
underline_origin,
glyph_origin.x - underline_origin.x,
@ -115,42 +118,84 @@ impl Line {
)?;
}
let max_glyph_bounds = Bounds {
origin: glyph_origin,
size: max_glyph_size,
};
glyph_origin.x = origin.x;
glyph_origin.y += line_height;
}
prev_glyph_position = glyph.position;
let content_mask = cx.content_mask();
if max_glyph_bounds.intersects(&content_mask.bounds) {
if glyph.is_emoji {
cx.paint_emoji(
glyph_origin + baseline_offset,
run.font_id,
glyph.id,
self.layout.layout.font_size,
)?;
} else {
cx.paint_glyph(
glyph_origin + baseline_offset,
run.font_id,
glyph.id,
self.layout.layout.font_size,
color,
)?;
let mut finished_underline: Option<(Point<Pixels>, UnderlineStyle)> = None;
if glyph.index >= run_end {
if let Some(style_run) = decoration_runs.next() {
if let Some((_, underline_style)) = &mut current_underline {
if style_run.underline.as_ref() != Some(underline_style) {
finished_underline = current_underline.take();
}
}
if let Some(run_underline) = style_run.underline.as_ref() {
current_underline.get_or_insert((
point(
glyph_origin.x,
origin.y + baseline_offset.y + (layout.descent * 0.618),
),
UnderlineStyle {
color: Some(run_underline.color.unwrap_or(style_run.color)),
thickness: run_underline.thickness,
wavy: run_underline.wavy,
},
));
}
run_end += style_run.len as usize;
color = style_run.color;
} else {
run_end = layout.len;
finished_underline = current_underline.take();
}
}
if let Some((underline_origin, underline_style)) = finished_underline {
cx.paint_underline(
underline_origin,
glyph_origin.x - underline_origin.x,
&underline_style,
)?;
}
let max_glyph_bounds = Bounds {
origin: glyph_origin,
size: max_glyph_size,
};
let content_mask = cx.content_mask();
if max_glyph_bounds.intersects(&content_mask.bounds) {
if glyph.is_emoji {
cx.paint_emoji(
glyph_origin + baseline_offset,
run.font_id,
glyph.id,
layout.font_size,
)?;
} else {
cx.paint_glyph(
glyph_origin + baseline_offset,
run.font_id,
glyph.id,
layout.font_size,
color,
)?;
}
}
}
if let Some((underline_start, underline_style)) = current_underline.take() {
let line_end_x = origin.x + self.layout.layout.width;
cx.paint_underline(
underline_start,
line_end_x - underline_start.x,
&underline_style,
)?;
}
Ok(())
}
if let Some((underline_start, underline_style)) = current_underline.take() {
let line_end_x = origin.x + wrap_width.unwrap_or(Pixels::MAX).min(layout.width);
cx.paint_underline(
underline_start,
line_end_x - underline_start.x,
&underline_style,
)?;
}
Ok(())
}

136
crates/gpui2/src/text_system/line_layout.rs
View file

@ -1,5 +1,4 @@
use crate::{px, FontId, GlyphId, Pixels, PlatformTextSystem, Point, SharedString};
use derive_more::{Deref, DerefMut};
use crate::{px, FontId, GlyphId, Pixels, PlatformTextSystem, Point, Size};
use parking_lot::{Mutex, RwLock, RwLockUpgradableReadGuard};
use smallvec::SmallVec;
use std::{
@ -149,13 +148,11 @@ impl LineLayout {
}
}
#[derive(Deref, DerefMut, Default, Debug)]
#[derive(Default, Debug)]
pub struct WrappedLineLayout {
#[deref]
#[deref_mut]
pub layout: LineLayout,
pub text: SharedString,
pub unwrapped_layout: Arc<LineLayout>,
pub wrap_boundaries: SmallVec<[WrapBoundary; 1]>,
pub wrap_width: Option<Pixels>,
}
#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord)]
@ -164,31 +161,74 @@ pub struct WrapBoundary {
pub glyph_ix: usize,
}
impl WrappedLineLayout {
pub fn len(&self) -> usize {
self.unwrapped_layout.len
}
pub fn width(&self) -> Pixels {
self.wrap_width
.unwrap_or(Pixels::MAX)
.min(self.unwrapped_layout.width)
}
pub fn size(&self, line_height: Pixels) -> Size<Pixels> {
Size {
width: self.width(),
height: line_height * (self.wrap_boundaries.len() + 1),
}
}
pub fn ascent(&self) -> Pixels {
self.unwrapped_layout.ascent
}
pub fn descent(&self) -> Pixels {
self.unwrapped_layout.descent
}
pub fn wrap_boundaries(&self) -> &[WrapBoundary] {
&self.wrap_boundaries
}
pub fn font_size(&self) -> Pixels {
self.unwrapped_layout.font_size
}
pub fn runs(&self) -> &[ShapedRun] {
&self.unwrapped_layout.runs
}
}
pub(crate) struct LineLayoutCache {
prev_frame: Mutex<HashMap<CacheKey, Arc<WrappedLineLayout>>>,
curr_frame: RwLock<HashMap<CacheKey, Arc<WrappedLineLayout>>>,
previous_frame: Mutex<HashMap<CacheKey, Arc<LineLayout>>>,
current_frame: RwLock<HashMap<CacheKey, Arc<LineLayout>>>,
previous_frame_wrapped: Mutex<HashMap<CacheKey, Arc<WrappedLineLayout>>>,
current_frame_wrapped: RwLock<HashMap<CacheKey, Arc<WrappedLineLayout>>>,
platform_text_system: Arc<dyn PlatformTextSystem>,
}
impl LineLayoutCache {
pub fn new(platform_text_system: Arc<dyn PlatformTextSystem>) -> Self {
Self {
prev_frame: Mutex::new(HashMap::new()),
curr_frame: RwLock::new(HashMap::new()),
previous_frame: Mutex::default(),
current_frame: RwLock::default(),
previous_frame_wrapped: Mutex::default(),
current_frame_wrapped: RwLock::default(),
platform_text_system,
}
}
pub fn start_frame(&self) {
let mut prev_frame = self.prev_frame.lock();
let mut curr_frame = self.curr_frame.write();
let mut prev_frame = self.previous_frame.lock();
let mut curr_frame = self.current_frame.write();
std::mem::swap(&mut *prev_frame, &mut *curr_frame);
curr_frame.clear();
}
pub fn layout_line(
pub fn layout_wrapped_line(
&self,
text: &SharedString,
text: &str,
font_size: Pixels,
runs: &[FontRun],
wrap_width: Option<Pixels>,
@ -199,34 +239,66 @@ impl LineLayoutCache {
runs,
wrap_width,
} as &dyn AsCacheKeyRef;
let curr_frame = self.curr_frame.upgradable_read();
if let Some(layout) = curr_frame.get(key) {
let current_frame = self.current_frame_wrapped.upgradable_read();
if let Some(layout) = current_frame.get(key) {
return layout.clone();
}
let mut curr_frame = RwLockUpgradableReadGuard::upgrade(curr_frame);
if let Some((key, layout)) = self.prev_frame.lock().remove_entry(key) {
curr_frame.insert(key, layout.clone());
let mut current_frame = RwLockUpgradableReadGuard::upgrade(current_frame);
if let Some((key, layout)) = self.previous_frame_wrapped.lock().remove_entry(key) {
current_frame.insert(key, layout.clone());
layout
} else {
let layout = self.platform_text_system.layout_line(text, font_size, runs);
let wrap_boundaries = wrap_width
.map(|wrap_width| layout.compute_wrap_boundaries(text.as_ref(), wrap_width))
.unwrap_or_default();
let wrapped_line = Arc::new(WrappedLineLayout {
layout,
text: text.clone(),
let unwrapped_layout = self.layout_line(text, font_size, runs);
let wrap_boundaries = if let Some(wrap_width) = wrap_width {
unwrapped_layout.compute_wrap_boundaries(text.as_ref(), wrap_width)
} else {
SmallVec::new()
};
let layout = Arc::new(WrappedLineLayout {
unwrapped_layout,
wrap_boundaries,
wrap_width,
});
let key = CacheKey {
text: text.clone(),
text: text.into(),
font_size,
runs: SmallVec::from(runs),
wrap_width,
};
curr_frame.insert(key, wrapped_line.clone());
wrapped_line
current_frame.insert(key, layout.clone());
layout
}
}
pub fn layout_line(&self, text: &str, font_size: Pixels, runs: &[FontRun]) -> Arc<LineLayout> {
let key = &CacheKeyRef {
text,
font_size,
runs,
wrap_width: None,
} as &dyn AsCacheKeyRef;
let current_frame = self.current_frame.upgradable_read();
if let Some(layout) = current_frame.get(key) {
return layout.clone();
}
let mut current_frame = RwLockUpgradableReadGuard::upgrade(current_frame);
if let Some((key, layout)) = self.previous_frame.lock().remove_entry(key) {
current_frame.insert(key, layout.clone());
layout
} else {
let layout = Arc::new(self.platform_text_system.layout_line(text, font_size, runs));
let key = CacheKey {
text: text.into(),
font_size,
runs: SmallVec::from(runs),
wrap_width: None,
};
current_frame.insert(key, layout.clone());
layout
}
}
}
@ -243,7 +315,7 @@ trait AsCacheKeyRef {
#[derive(Eq)]
struct CacheKey {
text: SharedString,
text: String,
font_size: Pixels,
runs: SmallVec<[FontRun; 1]>,
wrap_width: Option<Pixels>,