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Prune commentary and stale Rust port notes

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iris committed 2026-09-10 00:44:13 -04:00
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commit 1e6d3b1edd
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core/src/primitive/text.rs
+244 -409
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@@ -12,40 +12,13 @@ use swash::{
zeno::{Format, Vector},
};
/// The icon font iris ships: the Nerd Fonts Symbols **Mono** subset built
/// by `iris/core/build-icon-font.sh`, holding only the codepoints
/// `crate::icon` names (992 bytes for three glyphs today).
///
/// This is the one font bundled here, and it is not a text font: body and
/// monospace text still come from the platform's own collection
/// (decided 2026-09-07). An icon is the opposite case -- a small,
/// closed set of codepoints no system font is guaranteed to have -- which
/// is the same division the Compose app makes.
const NERD_ICONS: &[u8] = include_bytes!("../../assets/fonts/nerd_icons.ttf");
/// What starting up found about text rendering, for the on-screen
/// Diagnostics page and the one startup log line (RUST.md's P0 box, "log
/// once at startup ... the number of font families found, the default
/// family resolved"). Built once by `TextData::font_diagnostics` --
/// `Default::default` still exists for callers (tests, examples) that
/// don't need the report.
#[derive(Clone, Debug)]
pub struct FontDiagnostics {
/// `Collection::family_names().count()` after registering the bundled
/// fonts -- system families plus the two bundled ones.
pub families_found: usize,
/// The family `GenericFamily::SansSerif` resolves to first -- the
/// bundled "Noto Sans" unless registration itself failed.
pub default_family: Option<String>,
/// The family `GenericFamily::Monospace` resolves to first.
pub default_mono_family: Option<String>,
/// One resolved family name per style axis this crate actually uses
/// (`SpanStyle::bold`/`italic`), so a report can say plainly whether a
/// bold/italic request is landing on a real face rather than being
/// silently absorbed by whatever the sans-serif default resolves to
/// for every weight (RUST.md's P0 box, "bold words render as blank
/// gaps" -- a family that resolves but has no distinct bold face is
/// exactly what produced that).
pub regular_resolved: Option<String>,
pub bold_resolved: Option<String>,
pub italic_resolved: Option<String>,
@@ -57,8 +30,6 @@ pub struct FontDiagnostics {
pub icon_family: Option<String>,
}
/// Everything text needs that outlives one string: the font collection, the
/// layout scratch space, the glyph rasteriser and the atlas they fill.
pub struct TextData {
pub font_cx: FontContext,
pub layout_cx: LayoutContext<UiColor>,
@@ -84,19 +55,6 @@ pub struct TextData {
}
impl Default for TextData {
/// Text comes entirely from the platform's own font collection --
/// `FontContext::new()` builds a `fontique::Collection` with
/// `CollectionOptions::system_fonts` on by default, which is real
/// discovery on both targets this crate ships on: Android's backend
/// parses `/system/fonts` and `/system/etc/fonts.xml` and maps
/// `SansSerif`/`SystemUi` to `["Roboto Flex", "Roboto", "Noto Sans"]`
/// and `Monospace` to the platform's `"monospace"` alias; the desktop
/// build's backend is fontconfig. No font is bundled or registered
/// here -- see the 2026-09-07 decision for why (matching what
/// the Compose app does: it takes body/monospace text from
/// `FontFamily.Default`/`FontFamily.Monospace`, i.e. Android's Roboto
/// and its platform monospace face, and ships no text font of its own,
/// only its committed Nerd Fonts icon subset for fixed glyphs).
fn default() -> Self {
let mut font_cx = FontContext::new();
patch_android_monospace(&mut font_cx);
@@ -112,16 +70,6 @@ impl Default for TextData {
}
}
/// Registers the bundled icon font as an ordinary named family and
/// answers the name it registered under -- read back from the collection
/// rather than written down here, so the name cannot drift from the file
/// (`build-icon-font.sh` takes whatever face the Nerd Fonts release
/// ships).
///
/// A *named* family rather than a generic one: nothing should fall back
/// to it for ordinary text, and nothing should fall back out of it for an
/// icon -- a system face that happens to have one of these codepoints
/// would draw somebody else's picture.
fn register_icon_font(font_cx: &mut FontContext) -> Option<String> {
let blob = Blob::new(Arc::new(NERD_ICONS));
let id = font_cx
@@ -133,24 +81,6 @@ fn register_icon_font(font_cx: &mut FontContext) -> Option<String> {
font_cx.collection.family_name(id).map(str::to_string)
}
/// Works around `fontique` 0.11.1's Android backend never resolving
/// `GenericFamily::Monospace` (confirmed against
/// `fontique-0.11.1/src/backend/android.rs`'s `SystemFonts::new`, and still
/// present on `linebender/parley`'s `main` as of 2026-09-07, so there is no
/// released fix to bump to yet -- see the 2026-09-07 decision,
/// "Platform fonts," for the full account). Two bugs stack, not one:
/// `DEFAULT_GENERIC_FAMILIES` looks up the name `"monospace"` *before*
/// `fonts.xml` is parsed into that same name map, and even after parsing,
/// AOSP's `fonts.xml` names it with a `<family name="monospace">` element
/// (not an `<alias>`) whose `<font>` children the backend's own parser
/// does not read (a `TODO` in that match arm) -- so the name gets a
/// `FamilyId` with no font data behind it, and `family_by_name("monospace")`
/// comes back empty too. Confirmed on this checkout's emulator: `adb pull
/// /system/etc/fonts.xml` shows
/// `<family name="monospace"><font weight="400"
/// style="normal">DroidSansMono.ttf</font></family>` with no matching
/// alias.
///
/// So this reads `fonts.xml` itself (already on-device, already the
/// authority Compose's own `Typeface.MONOSPACE` resolves through) for the
/// filename that declaration names, then finds which of fontique's
@@ -204,13 +134,6 @@ fn patch_android_monospace(font_cx: &mut FontContext) {
}
}
/// Reads the font filename `fonts.xml` names for its `"monospace"` family
/// (e.g. `"DroidSansMono.ttf"`), by plain substring search rather than a
/// real XML parser -- a new dependency for one well-known, stable AOSP file
/// whose structure fontique itself already parses with a full parser one
/// module over. Not a general XML reader; assumes the file has exactly one
/// `<family name="monospace">` element with at least one `<font>` child,
/// which is the format on every AOSP `fonts.xml` this was checked against.
#[cfg(target_os = "android")]
fn android_monospace_font_filename() -> Option<String> {
let android_root = std::env::var("ANDROID_ROOT").unwrap_or_else(|_| "/system".to_string());
@@ -231,9 +154,6 @@ fn android_monospace_font_filename() -> Option<String> {
fn patch_android_monospace(_font_cx: &mut FontContext) {}
impl TextData {
/// [`Family::Icons`] as the name the bundled font actually registered
/// under; everything else unchanged.
///
/// Cloned rather than borrowed because the caller needs it while the
/// layout builder holds `&mut self` -- a `String` per shaped icon run,
/// paid only when the layout is rebuilt.
@@ -247,9 +167,6 @@ impl TextData {
}
}
/// Builds the startup report -- see `FontDiagnostics`. Queries the
/// collection directly (`fontique::Query`) rather than shaping a real
/// string, since all that's needed is which family each axis lands on.
pub fn font_diagnostics(&mut self) -> FontDiagnostics {
use parley::fontique::{Attributes, FontWidth, QueryStatus};
let families_found = self.font_cx.collection.family_names().count();
@@ -268,11 +185,6 @@ impl TextData {
let default_mono_family = default_mono_family_id
.and_then(|id| self.font_cx.collection.family_name(id).map(str::to_string));
// Resolves the family a (generic family, weight, style) query lands
// on, without holding the `Query`'s borrow of `collection` across
// the `family_name` lookup that needs it back -- the `FamilyId` is
// captured out of the closure first, then looked up once `query`
// (and its borrow) has been dropped.
let mut resolve_family =
|generic: GenericFamily, weight: FontWeight, style: FontStyle| -> Option<String> {
let mut family_id = None;
@@ -327,285 +239,7 @@ impl TextData {
icon_family: self.icon_family.clone(),
}
}
}
/// Which family to ask for. Kept as an owned name rather than parley's
/// borrowed `FontFamily<'_>` so that a widget can hold one without a lifetime.
#[derive(Clone, PartialEq)]
pub enum Family {
SansSerif,
Serif,
Monospace,
/// The bundled icon font -- see [`crate::icon`] for what is in it.
/// Named as an intention rather than as a font name because only
/// [`TextData`] knows what the file registered as; it resolves this
/// during shaping ([`TextData::resolve_family`]).
Icons,
Named(String),
}
impl Family {
fn family(&self) -> FontFamily<'_> {
let name = match self {
Self::SansSerif => FontFamilyName::Generic(GenericFamily::SansSerif),
Self::Serif => FontFamilyName::Generic(GenericFamily::Serif),
Self::Monospace => FontFamilyName::Generic(GenericFamily::Monospace),
// Only reachable if `resolve_family` did not run, which no
// shaping path allows -- and sans-serif is the honest answer
// for a build whose icon font failed to register: the reader
// gets the platform's own tofu rather than a wrong picture.
Self::Icons => FontFamilyName::Generic(GenericFamily::SansSerif),
Self::Named(name) => FontFamilyName::Named(name.as_str().into()),
};
FontFamily::Single(name)
}
}
/// One styled run inside a `TextBuffer`, overriding `TextAttrs`' base style
/// over `range` (a byte range into the buffer's text). Every field is
/// optional so a span only says what it changes -- e.g. a link span sets
/// `color` and `underline` and leaves weight/family at the paragraph's own
/// default. This is I5's answer to RUST.md's inline-rich-text ceiling
/// (`masonry/src/widgets/text_area.rs`'s `StyleSet` is one style for the
/// whole editor, with `// TODO: RichTextInput` beside it): parley's own
/// `RangedBuilder::push` already takes a style and a range, so per-span
/// bold/italic/monospace/colour/underline only needed plumbing this struct
/// through to it and giving each glyph its own colour at draw time (see
/// `PlacedGlyph::color` and `TextData::place` below) instead of the one
/// `RenderedText::color` every glyph used to share.
#[derive(Clone, PartialEq)]
pub struct SpanStyle {
pub range: Range<usize>,
pub color: Option<UiColor>,
pub family: Option<Family>,
/// Overrides `TextAttrs::font_size` for just this range -- what lets a
/// heading inside a transcript row's single `TextEdit` be bigger than
/// the paragraph text around it, so a whole markdown-folded row (block
/// and inline styling both) can stay one selectable text buffer instead
/// of one widget per block.
pub font_size: Option<f32>,
pub bold: bool,
pub italic: bool,
pub underline: bool,
}
impl SpanStyle {
pub fn new(range: Range<usize>) -> Self {
Self {
range,
color: None,
family: None,
font_size: None,
bold: false,
italic: false,
underline: false,
}
}
pub fn color(mut self, color: UiColor) -> Self {
self.color = Some(color);
self
}
pub fn family(mut self, family: Family) -> Self {
self.family = Some(family);
self
}
pub fn font_size(mut self, size: f32) -> Self {
self.font_size = Some(size);
self
}
pub fn bold(mut self) -> Self {
self.bold = true;
self
}
pub fn italic(mut self) -> Self {
self.italic = true;
self
}
pub fn underline(mut self) -> Self {
self.underline = true;
self
}
}
#[derive(Clone, PartialEq)]
pub struct TextAttrs {
pub color: UiColor,
pub font_size: f32,
pub line_height: f32,
pub family: Family,
pub wrap: bool,
/// inner alignment of text region (within where it's drawn)
pub align: RegionAlign,
}
pub const LINE_HEIGHT_MULT: f32 = 1.1;
impl Default for TextAttrs {
fn default() -> Self {
let size = 16.0;
Self {
color: UiColor::WHITE,
font_size: size,
line_height: size * LINE_HEIGHT_MULT,
family: Family::SansSerif,
wrap: false,
align: Align::CENTER_LEFT,
}
}
}
/// A string together with its laid-out form.
///
/// The text and the layout live in one place because parley's `Layout` borrows
/// nothing but is only meaningful against the string it was built from: keeping
/// them apart is how they get out of step.
pub struct TextBuffer {
text: String,
layout: Layout<UiColor>,
spans: Vec<SpanStyle>,
/// What the current layout was built for, so `shape` can decline to redo
/// work that would come out the same. Spans are not part of this key --
/// `set_spans` forces `shaped` to `None` directly, the same way `edit`
/// does, since spans change far less often than a naive equality check
/// on the whole `Vec` would cost to compute every frame.
shaped: Option<(TextAttrs, Option<f32>, f32)>,
}
impl TextBuffer {
pub fn new(text: impl Into<String>) -> Self {
Self {
text: text.into(),
layout: Layout::new(),
spans: Vec::new(),
shaped: None,
}
}
/// Replace this buffer's per-range style overrides (I5's rich text --
/// see `SpanStyle`). Invalidates the layout unconditionally, mirroring
/// `set_text`.
pub fn set_spans(&mut self, spans: Vec<SpanStyle>) {
self.spans = spans;
self.shaped = None;
}
pub fn new_empty() -> Self {
Self::new("")
}
pub fn text(&self) -> &str {
&self.text
}
pub fn layout(&self) -> &Layout<UiColor> {
&self.layout
}
pub fn is_empty(&self) -> bool {
self.text.is_empty()
}
pub fn set_text(&mut self, text: impl Into<String>) {
let text = text.into();
if text != self.text {
self.text = text;
self.shaped = None;
}
}
/// Edit the string in place; invalidates the layout unconditionally, since
/// the caller is assumed to have changed something.
pub fn edit(&mut self) -> &mut String {
self.shaped = None;
&mut self.text
}
pub fn size(&self) -> Vec2 {
Vec2::new(self.layout.width(), self.layout.height())
}
/// Lay the text out, unless it is already laid out for these
/// attributes, this width and this density.
///
/// **`attrs.font_size`/`line_height` and every span's own `font_size`
/// are density-independent (dp) units, multiplied by `density` here --
/// the one place text crosses from the widget tree's dp sizes into the
/// physical pixels the shaper and rasteriser (`TextData::place`) both
/// then work in.** This is what makes glyphs sharp on a dense display:
/// before this existed, `font_size` was already a physical-pixel value
/// (RUST.md's P0 box's global-scale stopgap resolved density by
/// stretching the whole rendered frame afterward instead), so a glyph
/// was rasterised small and then upscaled by whatever the display's
/// scale factor was -- exactly the blur Iris's report described.
/// Multiplying here instead means the font size hitting `ScaleContext`
/// in `place` below is already the display's real physical size, so
/// the atlas holds a bitmap at the resolution it is actually shown at.
/// `GlyphKey.size` already keys on that resolved `font_size`
/// (`(font_size * 16.0).round()`), so a cache entry is naturally per
/// physical size with no change needed there.
pub fn shape(
&mut self,
data: &mut TextData,
attrs: &TextAttrs,
width: Option<f32>,
density: f32,
) {
if self.shaped.as_ref() == Some(&(attrs.clone(), width, density)) {
return;
}
// Resolved before the builder borrows `data`: `Family::Icons`
// names an intention, and the name behind it lives on `TextData`.
let base_family = data.resolve_family(&attrs.family);
let span_families: Vec<Option<Family>> = self
.spans
.iter()
.map(|span| span.family.as_ref().map(|f| data.resolve_family(f)))
.collect();
let mut builder = data
.layout_cx
.ranged_builder(&mut data.font_cx, &self.text, 1.0, true);
builder.push_default(StyleProperty::FontFamily(base_family.family()));
builder.push_default(StyleProperty::FontSize(attrs.font_size * density));
builder.push_default(StyleProperty::LineHeight(LineHeight::Absolute(
attrs.line_height * density,
)));
builder.push_default(StyleProperty::Brush(attrs.color));
for (span, family) in self.spans.iter().zip(&span_families) {
let range = span.range.clone();
if let Some(color) = span.color {
builder.push(StyleProperty::Brush(color), range.clone());
}
if let Some(family) = family {
builder.push(StyleProperty::FontFamily(family.family()), range.clone());
}
if let Some(size) = span.font_size {
builder.push(StyleProperty::FontSize(size * density), range.clone());
}
if span.bold {
builder.push(StyleProperty::FontWeight(FontWeight::BOLD), range.clone());
}
if span.italic {
builder.push(StyleProperty::FontStyle(FontStyle::Italic), range.clone());
}
if span.underline {
builder.push(StyleProperty::Underline(true), range.clone());
}
}
builder.build_into(&mut self.layout, &self.text);
self.layout.break_all_lines(width);
self.layout
.align(Alignment::Start, AlignmentOptions::default());
self.shaped = Some((attrs.clone(), width, density));
}
}
impl TextData {
/// Rasterise whatever of `buffer` is not in the atlas yet, and return where
/// each glyph goes relative to the text's top-left.
///
/// Nothing is uploaded for a glyph already in the atlas, which is the point
/// of having one: a resize re-runs this and touches the GPU only if the new
/// width brought genuinely new glyphs into view.
pub fn place(&mut self, buffer: &TextBuffer, textures: &mut Textures) -> Vec<PlacedGlyph> {
let mut placed = Vec::new();
for line in buffer.layout.lines() {
@@ -622,8 +256,6 @@ impl TextData {
continue;
};
let coords_hash = hash_coords(coords);
// `font.data.id()` rather than the pointer, so the same font
// loaded twice is still one set of entries.
let font_id = font.data.id();
for glyph in run.positioned_glyphs() {
@@ -676,41 +308,7 @@ impl TextData {
}
placed
}
}
fn hash_coords(coords: &[i16]) -> u64 {
// FxHash over the coordinates; they are short and change rarely.
let mut h: u64 = 0xcbf2_9ce4_8422_2325;
for c in coords {
h ^= *c as u16 as u64;
h = h.wrapping_mul(0x1000_0000_01b3);
}
h
}
/// A laid-out string, ready to draw: where each glyph goes and how big the
/// whole thing is.
///
/// Cheap to clone and to keep, which is the point -- a widget holds one across
/// frames and re-emits its quads without going near the rasteriser. `color`
/// is the buffer's *base* colour (`TextAttrs::color`) for a caller that wants
/// it as a whole (e.g. tinting a cursor to match); the colour each glyph is
/// actually drawn in is `PlacedGlyph::color`, which a `SpanStyle` can
/// override per range.
#[derive(Clone)]
pub struct RenderedText {
pub glyphs: std::sync::Arc<Vec<PlacedGlyph>>,
pub size: Vec2,
pub color: UiColor,
/// The [`GlyphAtlas::generation`] the glyphs above were placed against.
/// A holder must re-render rather than re-emit these quads once the
/// atlas has moved on (`GlyphAtlas::clear`'s doc says what happens
/// otherwise); `Painter::glyphs` debug-asserts it.
pub generation: u64,
}
impl TextData {
/// Lay out and place in one step, which is what a widget wants.
pub fn render(
&mut self,
buffer: &mut TextBuffer,
@@ -730,16 +328,255 @@ impl TextData {
}
}
/// Which family to ask for. Kept as an owned name rather than parley's
/// borrowed `FontFamily<'_>` so that a widget can hold one without a lifetime.
#[derive(Clone, PartialEq)]
pub enum Family {
SansSerif,
Serif,
Monospace,
/// The bundled icon font -- see [`crate::icon`] for what is in it.
/// Named as an intention rather than as a font name because only
/// [`TextData`] knows what the file registered as; it resolves this
/// during shaping ([`TextData::resolve_family`]).
Icons,
Named(String),
}
impl Family {
fn family(&self) -> FontFamily<'_> {
let name = match self {
Self::SansSerif => FontFamilyName::Generic(GenericFamily::SansSerif),
Self::Serif => FontFamilyName::Generic(GenericFamily::Serif),
Self::Monospace => FontFamilyName::Generic(GenericFamily::Monospace),
Self::Icons => FontFamilyName::Generic(GenericFamily::SansSerif),
Self::Named(name) => FontFamilyName::Named(name.as_str().into()),
};
FontFamily::Single(name)
}
}
#[derive(Clone, PartialEq)]
pub struct SpanStyle {
pub range: Range<usize>,
pub color: Option<UiColor>,
pub family: Option<Family>,
pub font_size: Option<f32>,
pub bold: bool,
pub italic: bool,
pub underline: bool,
}
impl SpanStyle {
pub fn new(range: Range<usize>) -> Self {
Self {
range,
color: None,
family: None,
font_size: None,
bold: false,
italic: false,
underline: false,
}
}
pub fn color(mut self, color: UiColor) -> Self {
self.color = Some(color);
self
}
pub fn family(mut self, family: Family) -> Self {
self.family = Some(family);
self
}
pub fn font_size(mut self, size: f32) -> Self {
self.font_size = Some(size);
self
}
pub fn bold(mut self) -> Self {
self.bold = true;
self
}
pub fn italic(mut self) -> Self {
self.italic = true;
self
}
pub fn underline(mut self) -> Self {
self.underline = true;
self
}
}
#[derive(Clone, PartialEq)]
pub struct TextAttrs {
pub color: UiColor,
pub font_size: f32,
pub line_height: f32,
pub family: Family,
pub wrap: bool,
pub align: RegionAlign,
}
pub const LINE_HEIGHT_MULT: f32 = 1.1;
impl Default for TextAttrs {
fn default() -> Self {
let size = 16.0;
Self {
color: UiColor::WHITE,
font_size: size,
line_height: size * LINE_HEIGHT_MULT,
family: Family::SansSerif,
wrap: false,
align: Align::CENTER_LEFT,
}
}
}
/// The text and the layout live in one place because parley's `Layout` borrows
/// nothing but is only meaningful against the string it was built from: keeping
/// them apart is how they get out of step.
pub struct TextBuffer {
text: String,
layout: Layout<UiColor>,
spans: Vec<SpanStyle>,
shaped: Option<(TextAttrs, Option<f32>, f32)>,
}
impl TextBuffer {
pub fn new(text: impl Into<String>) -> Self {
Self {
text: text.into(),
layout: Layout::new(),
spans: Vec::new(),
shaped: None,
}
}
pub fn set_spans(&mut self, spans: Vec<SpanStyle>) {
self.spans = spans;
self.shaped = None;
}
pub fn new_empty() -> Self {
Self::new("")
}
pub fn text(&self) -> &str {
&self.text
}
pub fn layout(&self) -> &Layout<UiColor> {
&self.layout
}
pub fn is_empty(&self) -> bool {
self.text.is_empty()
}
pub fn set_text(&mut self, text: impl Into<String>) {
let text = text.into();
if text != self.text {
self.text = text;
self.shaped = None;
}
}
/// Edit the string in place; invalidates the layout unconditionally, since
/// the caller is assumed to have changed something.
pub fn edit(&mut self) -> &mut String {
self.shaped = None;
&mut self.text
}
pub fn size(&self) -> Vec2 {
Vec2::new(self.layout.width(), self.layout.height())
}
pub fn shape(
&mut self,
data: &mut TextData,
attrs: &TextAttrs,
width: Option<f32>,
density: f32,
) {
if self.shaped.as_ref() == Some(&(attrs.clone(), width, density)) {
return;
}
let base_family = data.resolve_family(&attrs.family);
let span_families: Vec<Option<Family>> = self
.spans
.iter()
.map(|span| span.family.as_ref().map(|f| data.resolve_family(f)))
.collect();
let mut builder = data
.layout_cx
.ranged_builder(&mut data.font_cx, &self.text, 1.0, true);
builder.push_default(StyleProperty::FontFamily(base_family.family()));
builder.push_default(StyleProperty::FontSize(attrs.font_size * density));
builder.push_default(StyleProperty::LineHeight(LineHeight::Absolute(
attrs.line_height * density,
)));
builder.push_default(StyleProperty::Brush(attrs.color));
for (span, family) in self.spans.iter().zip(&span_families) {
let range = span.range.clone();
if let Some(color) = span.color {
builder.push(StyleProperty::Brush(color), range.clone());
}
if let Some(family) = family {
builder.push(StyleProperty::FontFamily(family.family()), range.clone());
}
if let Some(size) = span.font_size {
builder.push(StyleProperty::FontSize(size * density), range.clone());
}
if span.bold {
builder.push(StyleProperty::FontWeight(FontWeight::BOLD), range.clone());
}
if span.italic {
builder.push(StyleProperty::FontStyle(FontStyle::Italic), range.clone());
}
if span.underline {
builder.push(StyleProperty::Underline(true), range.clone());
}
}
builder.build_into(&mut self.layout, &self.text);
self.layout.break_all_lines(width);
self.layout
.align(Alignment::Start, AlignmentOptions::default());
self.shaped = Some((attrs.clone(), width, density));
}
}
fn hash_coords(coords: &[i16]) -> u64 {
let mut h: u64 = 0xcbf2_9ce4_8422_2325;
for c in coords {
h ^= *c as u16 as u64;
h = h.wrapping_mul(0x1000_0000_01b3);
}
h
}
/// Cheap to clone and to keep, which is the point -- a widget holds one across
/// frames and re-emits its quads without going near the rasteriser. `color`
/// is the buffer's *base* colour (`TextAttrs::color`) for a caller that wants
/// it as a whole (e.g. tinting a cursor to match); the colour each glyph is
/// actually drawn in is `PlacedGlyph::color`, which a `SpanStyle` can
/// override per range.
#[derive(Clone)]
pub struct RenderedText {
pub glyphs: std::sync::Arc<Vec<PlacedGlyph>>,
pub size: Vec2,
pub color: UiColor,
/// The [`GlyphAtlas::generation`] the glyphs above were placed against.
/// A holder must re-render rather than re-emit these quads once the
/// atlas has moved on (`GlyphAtlas::clear`'s doc says what happens
/// otherwise); `Painter::glyphs` debug-asserts it.
pub generation: u64,
}
#[cfg(test)]
mod tests {
use super::*;
use crate::icon;
/// Every codepoint `icon` names is actually in the subset the script
/// built. This is the failure `build-icon-font.sh`'s own comment warns
/// about -- a constant added on one side and not the other is a glyph
/// that silently isn't there -- and it is invisible at runtime,
/// because a missing glyph draws as nothing rather than as an error.
#[test]
fn every_icon_is_in_the_bundled_font() {
let font = FontRef::from_index(NERD_ICONS, 0).expect("the bundled icon font parses");
@@ -762,8 +599,6 @@ mod tests {
}
}
/// The font registers, so `Family::Icons` resolves to a real family
/// rather than falling through to sans-serif and drawing tofu.
#[test]
fn the_icon_family_registers_and_resolves() {
let data = TextData::default();