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Choose your own font and size (#1154)

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* Refactor text layout: don't need &Fonts in all functions
* Replace indexing in Fonts with member function
* Wrap Fonts in a Mutex
* Remove mutex for Font::glyph_info_cache
* Remove RwLock around Font::characters
* Put FontsImpl and GalleyCache behind the same Mutex
* Round font sizes to whole pixels before deduplicating them
* Make TextStyle !Copy
* Implement user-named TextStyle:s
* round font size earlier
* Cache fonts based on family and size
* Move TextStyle into egui and Style
* Remove body_text_style
* Query graphics about max texture size and use that as font atlas size
* Recreate texture atlas when it is getting full
This commit is contained in:
Emil Ernerfeldt
2022-01-24 14:32:36 +01:00
committed by GitHub
parent bb407e9b00
commit fa43d16c41
67 changed files with 1231 additions and 640 deletions
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617
epaint/src/text/fonts.rs
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@@ -1,63 +1,122 @@
use std::collections::BTreeMap;
use crate::{
mutex::{Arc, Mutex},
mutex::{Arc, Mutex, MutexGuard},
text::{
font::{Font, FontImpl},
Galley, LayoutJob,
},
TextureAtlas,
};
use emath::NumExt as _;
// TODO: rename
/// One of a few categories of styles of text, e.g. body, button or heading.
#[derive(Copy, Clone, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
// ----------------------------------------------------------------------------
/// How to select a sized font.
#[derive(Clone, Debug, PartialEq)]
#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
#[cfg_attr(feature = "serde", serde(rename_all = "snake_case"))]
pub enum TextStyle {
/// Used when small text is needed.
Small,
/// Normal labels. Easily readable, doesn't take up too much space.
Body,
/// Buttons. Maybe slightly bigger than `Body`.
Button,
/// Heading. Probably larger than `Body`.
Heading,
/// Same size as `Body`, but used when monospace is important (for aligning number, code snippets, etc).
Monospace,
pub struct FontId {
/// Height in points.
pub size: f32,
/// What font family to use.
pub family: FontFamily,
// TODO: weight (bold), italics, …
}
impl TextStyle {
pub fn all() -> impl ExactSizeIterator<Item = TextStyle> {
[
TextStyle::Small,
TextStyle::Body,
TextStyle::Button,
TextStyle::Heading,
TextStyle::Monospace,
]
.iter()
.copied()
impl Default for FontId {
#[inline]
fn default() -> Self {
Self {
size: 14.0,
family: FontFamily::Proportional,
}
}
}
/// Which style of font: [`Monospace`][`FontFamily::Monospace`] or [`Proportional`][`FontFamily::Proportional`].
#[derive(Copy, Clone, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
#[cfg_attr(feature = "serde", serde(rename_all = "snake_case"))]
pub enum FontFamily {
/// A font where each character is the same width (`w` is the same width as `i`).
Monospace,
/// A font where some characters are wider than other (e.g. 'w' is wider than 'i').
Proportional,
impl FontId {
#[inline]
pub fn new(size: f32, family: FontFamily) -> Self {
Self { size, family }
}
#[inline]
pub fn proportional(size: f32) -> Self {
Self::new(size, FontFamily::Proportional)
}
#[inline]
pub fn monospace(size: f32) -> Self {
Self::new(size, FontFamily::Monospace)
}
}
#[allow(clippy::derive_hash_xor_eq)]
impl std::hash::Hash for FontId {
#[inline(always)]
fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
let Self { size, family } = self;
crate::f32_hash(state, *size);
family.hash(state);
}
}
// ----------------------------------------------------------------------------
/// Font of unknown size.
///
/// Which style of font: [`Monospace`][`FontFamily::Monospace`], [`Proportional`][`FontFamily::Proportional`],
/// or by user-chosen name.
#[derive(Clone, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
pub enum FontFamily {
/// A font where some characters are wider than other (e.g. 'w' is wider than 'i').
///
/// Proportional fonts are easier to read and should be the preferred choice in most situations.
Proportional,
/// A font where each character is the same width (`w` is the same width as `i`).
///
/// Useful for code snippets, or when you need to align numbers or text.
Monospace,
/// One of the names in [`FontDefinitions::families`].
///
/// ```
/// # use epaint::FontFamily;
/// // User-chosen names:
/// FontFamily::Name("arial".into());
/// FontFamily::Name("serif".into());
/// ```
Name(Arc<str>),
}
impl Default for FontFamily {
#[inline]
fn default() -> Self {
FontFamily::Proportional
}
}
impl std::fmt::Display for FontFamily {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Self::Monospace => "Monospace".fmt(f),
Self::Proportional => "Proportional".fmt(f),
Self::Name(name) => (*name).fmt(f),
}
}
}
// ----------------------------------------------------------------------------
/// A `.ttf` or `.otf` file and a font face index.
#[derive(Clone, Debug, PartialEq)]
#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
pub struct FontData {
/// The content of a `.ttf` or `.otf` file.
pub font: std::borrow::Cow<'static, [u8]>,
/// Which font face in the file to use.
/// When in doubt, use `0`.
pub index: u32,
@@ -97,28 +156,12 @@ fn ab_glyph_font_from_font_data(name: &str, data: &FontData) -> ab_glyph::FontAr
///
/// Often you would start with [`FontDefinitions::default()`] and then add/change the contents.
///
/// This is how you install your own custom fonts:
/// ```
/// # use {epaint::text::{FontDefinitions, TextStyle, FontFamily}};
/// # use {epaint::text::{FontDefinitions, FontFamily, FontData}};
/// # struct FakeEguiCtx {};
/// # impl FakeEguiCtx { fn set_fonts(&self, _: FontDefinitions) {} }
/// # let ctx = FakeEguiCtx {};
/// let mut fonts = FontDefinitions::default();
///
/// // Large button text:
/// fonts.family_and_size.insert(
/// TextStyle::Button,
/// (FontFamily::Proportional, 32.0)
/// );
///
/// ctx.set_fonts(fonts);
/// ```
///
/// You can also install your own custom fonts:
/// ```
/// # use {epaint::text::{FontDefinitions, TextStyle, FontFamily, FontData}};
/// # struct FakeEguiCtx {};
/// # impl FakeEguiCtx { fn set_fonts(&self, _: FontDefinitions) {} }
/// # let ctx = FakeEguiCtx {};
/// # let egui_ctx = FakeEguiCtx {};
/// let mut fonts = FontDefinitions::default();
///
/// // Install my own font (maybe supporting non-latin characters):
@@ -126,14 +169,14 @@ fn ab_glyph_font_from_font_data(name: &str, data: &FontData) -> ab_glyph::FontAr
/// FontData::from_static(include_bytes!("../../fonts/Ubuntu-Light.ttf"))); // .ttf and .otf supported
///
/// // Put my font first (highest priority):
/// fonts.fonts_for_family.get_mut(&FontFamily::Proportional).unwrap()
/// fonts.families.get_mut(&FontFamily::Proportional).unwrap()
/// .insert(0, "my_font".to_owned());
///
/// // Put my font as last fallback for monospace:
/// fonts.fonts_for_family.get_mut(&FontFamily::Monospace).unwrap()
/// fonts.families.get_mut(&FontFamily::Monospace).unwrap()
/// .push("my_font".to_owned());
///
/// ctx.set_fonts(fonts);
/// egui_ctx.set_fonts(fonts);
/// ```
#[derive(Clone, Debug, PartialEq)]
#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
@@ -150,10 +193,8 @@ pub struct FontDefinitions {
/// When looking for a character glyph `epaint` will start with
/// the first font and then move to the second, and so on.
/// So the first font is the primary, and then comes a list of fallbacks in order of priority.
pub fonts_for_family: BTreeMap<FontFamily, Vec<String>>,
/// The [`FontFamily`] and size you want to use for a specific [`TextStyle`].
pub family_and_size: BTreeMap<TextStyle, (FontFamily, f32)>,
// TODO: per font size-modifier.
pub families: BTreeMap<FontFamily, Vec<String>>,
}
impl Default for FontDefinitions {
@@ -161,7 +202,7 @@ impl Default for FontDefinitions {
#[allow(unused)]
let mut font_data: BTreeMap<String, FontData> = BTreeMap::new();
let mut fonts_for_family = BTreeMap::new();
let mut families = BTreeMap::new();
#[cfg(feature = "default_fonts")]
{
@@ -185,7 +226,7 @@ impl Default for FontDefinitions {
FontData::from_static(include_bytes!("../../fonts/emoji-icon-font.ttf")),
);
fonts_for_family.insert(
families.insert(
FontFamily::Monospace,
vec![
"Hack".to_owned(),
@@ -194,7 +235,7 @@ impl Default for FontDefinitions {
"emoji-icon-font".to_owned(),
],
);
fonts_for_family.insert(
families.insert(
FontFamily::Proportional,
vec![
"Ubuntu-Light".to_owned(),
@@ -206,49 +247,240 @@ impl Default for FontDefinitions {
#[cfg(not(feature = "default_fonts"))]
{
fonts_for_family.insert(FontFamily::Monospace, vec![]);
fonts_for_family.insert(FontFamily::Proportional, vec![]);
families.insert(FontFamily::Monospace, vec![]);
families.insert(FontFamily::Proportional, vec![]);
}
let mut family_and_size = BTreeMap::new();
family_and_size.insert(TextStyle::Small, (FontFamily::Proportional, 10.0));
family_and_size.insert(TextStyle::Body, (FontFamily::Proportional, 14.0));
family_and_size.insert(TextStyle::Button, (FontFamily::Proportional, 14.0));
family_and_size.insert(TextStyle::Heading, (FontFamily::Proportional, 20.0));
family_and_size.insert(TextStyle::Monospace, (FontFamily::Monospace, 14.0));
Self {
font_data,
fonts_for_family,
family_and_size,
families,
}
}
}
// ----------------------------------------------------------------------------
/// The collection of fonts used by `epaint`.
///
/// Required in order to paint text.
pub struct Fonts {
pixels_per_point: f32,
definitions: FontDefinitions,
fonts: BTreeMap<TextStyle, Font>,
atlas: Arc<Mutex<TextureAtlas>>,
galley_cache: Mutex<GalleyCache>,
}
/// Create one and reuse. Cheap to clone.
///
/// You need to call [`Self::begin_frame`] and [`Self::font_image_delta`] once every frame.
///
/// Wrapper for `Arc<Mutex<FontsAndCache>>`.
pub struct Fonts(Arc<Mutex<FontsAndCache>>);
impl Fonts {
/// Create a new [`Fonts`] for text layout.
/// This call is expensive, so only create one [`Fonts`] and then reuse it.
pub fn new(pixels_per_point: f32, definitions: FontDefinitions) -> Self {
///
/// * `pixels_per_point`: how many physical pixels per logical "point".
/// * `max_texture_side`: largest supported texture size (one side).
pub fn new(
pixels_per_point: f32,
max_texture_side: usize,
definitions: FontDefinitions,
) -> Self {
let fonts_and_cache = FontsAndCache {
fonts: FontsImpl::new(pixels_per_point, max_texture_side, definitions),
galley_cache: Default::default(),
};
Self(Arc::new(Mutex::new(fonts_and_cache)))
}
/// Call at the start of each frame with the latest known
/// `pixels_per_point` and `max_texture_side`.
///
/// Call after painting the previous frame, but before using [`Fonts`] for the new frame.
///
/// This function will react to changes in `pixels_per_point` and `max_texture_side`,
/// as well as notice when the font atlas is getting full, and handle that.
pub fn begin_frame(&self, pixels_per_point: f32, max_texture_side: usize) {
let mut fonts_and_cache = self.0.lock();
let pixels_per_point_changed =
(fonts_and_cache.fonts.pixels_per_point - pixels_per_point).abs() > 1e-3;
let max_texture_side_changed = fonts_and_cache.fonts.max_texture_side != max_texture_side;
let font_atlas_almost_full = fonts_and_cache.fonts.atlas.lock().fill_ratio() > 0.8;
let needs_recreate =
pixels_per_point_changed || max_texture_side_changed || font_atlas_almost_full;
if needs_recreate {
let definitions = fonts_and_cache.fonts.definitions.clone();
*fonts_and_cache = FontsAndCache {
fonts: FontsImpl::new(pixels_per_point, max_texture_side, definitions),
galley_cache: Default::default(),
};
}
fonts_and_cache.galley_cache.flush_cache();
}
/// Call at the end of each frame (before painting) to get the change to the font texture since last call.
pub fn font_image_delta(&self) -> Option<crate::ImageDelta> {
self.lock().fonts.atlas.lock().take_delta()
}
/// Access the underlying [`FontsAndCache`].
#[doc(hidden)]
#[inline]
pub fn lock(&self) -> MutexGuard<'_, FontsAndCache> {
self.0.lock()
}
#[inline]
pub fn pixels_per_point(&self) -> f32 {
self.lock().fonts.pixels_per_point
}
#[inline]
pub fn max_texture_side(&self) -> usize {
self.lock().fonts.max_texture_side
}
/// Current size of the font image.
/// Pass this to [`crate::Tessellator`].
pub fn font_image_size(&self) -> [usize; 2] {
self.lock().fonts.atlas.lock().size()
}
/// Width of this character in points.
#[inline]
pub fn glyph_width(&self, font_id: &FontId, c: char) -> f32 {
self.lock().fonts.glyph_width(font_id, c)
}
/// Height of one row of text in points
#[inline]
pub fn row_height(&self, font_id: &FontId) -> f32 {
self.lock().fonts.row_height(font_id)
}
/// List of all known font families.
pub fn families(&self) -> Vec<FontFamily> {
self.lock()
.fonts
.definitions
.families
.keys()
.cloned()
.collect()
}
/// Layout some text.
///
/// This is the most advanced layout function.
/// See also [`Self::layout`], [`Self::layout_no_wrap`] and
/// [`Self::layout_delayed_color`].
///
/// The implementation uses memoization so repeated calls are cheap.
#[inline]
pub fn layout_job(&self, job: LayoutJob) -> Arc<Galley> {
self.lock().layout_job(job)
}
pub fn num_galleys_in_cache(&self) -> usize {
self.lock().galley_cache.num_galleys_in_cache()
}
/// How full is the font atlas?
///
/// This increases as new fonts and/or glyphs are used,
/// but can also decrease in a call to [`Self::begin_frame`].
pub fn font_atlas_fill_ratio(&self) -> f32 {
self.lock().fonts.atlas.lock().fill_ratio()
}
/// Will wrap text at the given width and line break at `\n`.
///
/// The implementation uses memoization so repeated calls are cheap.
pub fn layout(
&self,
text: String,
font_id: FontId,
color: crate::Color32,
wrap_width: f32,
) -> Arc<Galley> {
let job = LayoutJob::simple(text, font_id, color, wrap_width);
self.layout_job(job)
}
/// Will line break at `\n`.
///
/// The implementation uses memoization so repeated calls are cheap.
pub fn layout_no_wrap(
&self,
text: String,
font_id: FontId,
color: crate::Color32,
) -> Arc<Galley> {
let job = LayoutJob::simple(text, font_id, color, f32::INFINITY);
self.layout_job(job)
}
/// Like [`Self::layout`], made for when you want to pick a color for the text later.
///
/// The implementation uses memoization so repeated calls are cheap.
pub fn layout_delayed_color(
&self,
text: String,
font_id: FontId,
wrap_width: f32,
) -> Arc<Galley> {
self.layout_job(LayoutJob::simple(
text,
font_id,
crate::Color32::TEMPORARY_COLOR,
wrap_width,
))
}
}
// ----------------------------------------------------------------------------
pub struct FontsAndCache {
pub fonts: FontsImpl,
galley_cache: GalleyCache,
}
impl FontsAndCache {
fn layout_job(&mut self, job: LayoutJob) -> Arc<Galley> {
self.galley_cache.layout(&mut self.fonts, job)
}
}
// ----------------------------------------------------------------------------
/// The collection of fonts used by `epaint`.
///
/// Required in order to paint text.
pub struct FontsImpl {
pixels_per_point: f32,
max_texture_side: usize,
definitions: FontDefinitions,
atlas: Arc<Mutex<TextureAtlas>>,
font_impl_cache: FontImplCache,
sized_family: ahash::AHashMap<(u32, FontFamily), Font>,
}
impl FontsImpl {
/// Create a new [`FontsImpl`] for text layout.
/// This call is expensive, so only create one [`FontsImpl`] and then reuse it.
pub fn new(
pixels_per_point: f32,
max_texture_side: usize,
definitions: FontDefinitions,
) -> Self {
assert!(
0.0 < pixels_per_point && pixels_per_point < 100.0,
"pixels_per_point out of range: {}",
pixels_per_point
);
// We want an atlas big enough to be able to include all the Emojis in the `TextStyle::Heading`,
// so we can show the Emoji picker demo window.
let mut atlas = TextureAtlas::new([2048, 64]);
let texture_width = max_texture_side.at_most(16 * 1024);
let initial_height = 512;
let mut atlas = TextureAtlas::new([texture_width, initial_height]);
{
// Make the top left pixel fully white:
@@ -259,31 +491,16 @@ impl Fonts {
let atlas = Arc::new(Mutex::new(atlas));
let mut font_impl_cache = FontImplCache::new(atlas.clone(), pixels_per_point, &definitions);
let fonts = definitions
.family_and_size
.iter()
.map(|(&text_style, &(family, scale_in_points))| {
let fonts = &definitions.fonts_for_family.get(&family);
let fonts = fonts.unwrap_or_else(|| {
panic!("FontFamily::{:?} is not bound to any fonts", family)
});
let fonts: Vec<Arc<FontImpl>> = fonts
.iter()
.map(|font_name| font_impl_cache.font_impl(font_name, scale_in_points))
.collect();
(text_style, Font::new(text_style, fonts))
})
.collect();
let font_impl_cache =
FontImplCache::new(atlas.clone(), pixels_per_point, &definitions.font_data);
Self {
pixels_per_point,
max_texture_side,
definitions,
fonts,
atlas,
galley_cache: Default::default(),
font_impl_cache,
sized_family: Default::default(),
}
}
@@ -292,110 +509,41 @@ impl Fonts {
self.pixels_per_point
}
#[inline]
pub fn definitions(&self) -> &FontDefinitions {
&self.definitions
}
#[inline(always)]
pub fn round_to_pixel(&self, point: f32) -> f32 {
(point * self.pixels_per_point).round() / self.pixels_per_point
}
/// Get the right font implementation from size and [`FontFamily`].
pub fn font(&mut self, font_id: &FontId) -> &mut Font {
let FontId { size, family } = font_id;
let scale_in_pixels = self.font_impl_cache.scale_as_pixels(*size);
#[inline(always)]
pub fn floor_to_pixel(&self, point: f32) -> f32 {
(point * self.pixels_per_point).floor() / self.pixels_per_point
}
self.sized_family
.entry((scale_in_pixels, family.clone()))
.or_insert_with(|| {
let fonts = &self.definitions.families.get(family);
let fonts = fonts.unwrap_or_else(|| {
panic!("FontFamily::{:?} is not bound to any fonts", family)
});
/// Call each frame to get the change to the font texture since last call.
pub fn font_image_delta(&self) -> Option<crate::ImageDelta> {
self.atlas.lock().take_delta()
}
let fonts: Vec<Arc<FontImpl>> = fonts
.iter()
.map(|font_name| self.font_impl_cache.font_impl(scale_in_pixels, font_name))
.collect();
/// Current size of the font image
pub fn font_image_size(&self) -> [usize; 2] {
self.atlas.lock().size()
Font::new(fonts)
})
}
/// Width of this character in points.
pub fn glyph_width(&self, text_style: TextStyle, c: char) -> f32 {
self.fonts[&text_style].glyph_width(c)
fn glyph_width(&mut self, font_id: &FontId, c: char) -> f32 {
self.font(font_id).glyph_width(c)
}
/// Height of one row of text. In points
pub fn row_height(&self, text_style: TextStyle) -> f32 {
self.fonts[&text_style].row_height()
}
/// Layout some text.
/// This is the most advanced layout function.
/// See also [`Self::layout`], [`Self::layout_no_wrap`] and
/// [`Self::layout_delayed_color`].
///
/// The implementation uses memoization so repeated calls are cheap.
pub fn layout_job(&self, job: LayoutJob) -> Arc<Galley> {
self.galley_cache.lock().layout(self, job)
}
/// Will wrap text at the given width and line break at `\n`.
///
/// The implementation uses memoization so repeated calls are cheap.
pub fn layout(
&self,
text: String,
text_style: TextStyle,
color: crate::Color32,
wrap_width: f32,
) -> Arc<Galley> {
let job = LayoutJob::simple(text, text_style, color, wrap_width);
self.layout_job(job)
}
/// Will line break at `\n`.
///
/// The implementation uses memoization so repeated calls are cheap.
pub fn layout_no_wrap(
&self,
text: String,
text_style: TextStyle,
color: crate::Color32,
) -> Arc<Galley> {
let job = LayoutJob::simple(text, text_style, color, f32::INFINITY);
self.layout_job(job)
}
/// Like [`Self::layout`], made for when you want to pick a color for the text later.
///
/// The implementation uses memoization so repeated calls are cheap.
pub fn layout_delayed_color(
&self,
text: String,
text_style: TextStyle,
wrap_width: f32,
) -> Arc<Galley> {
self.layout_job(LayoutJob::simple(
text,
text_style,
crate::Color32::TEMPORARY_COLOR,
wrap_width,
))
}
pub fn num_galleys_in_cache(&self) -> usize {
self.galley_cache.lock().num_galleys_in_cache()
}
/// Must be called once per frame to clear the [`Galley`] cache.
pub fn end_frame(&self) {
self.galley_cache.lock().end_frame();
}
}
impl std::ops::Index<TextStyle> for Fonts {
type Output = Font;
#[inline(always)]
fn index(&self, text_style: TextStyle) -> &Font {
&self.fonts[&text_style]
fn row_height(&mut self, font_id: &FontId) -> f32 {
self.font(font_id).row_height()
}
}
@@ -415,7 +563,7 @@ struct GalleyCache {
}
impl GalleyCache {
fn layout(&mut self, fonts: &Fonts, job: LayoutJob) -> Arc<Galley> {
fn layout(&mut self, fonts: &mut FontsImpl, job: LayoutJob) -> Arc<Galley> {
let hash = crate::util::hash(&job); // TODO: even faster hasher?
match self.cache.entry(hash) {
@@ -441,7 +589,7 @@ impl GalleyCache {
}
/// Must be called once per frame to clear the [`Galley`] cache.
pub fn end_frame(&mut self) {
pub fn flush_cache(&mut self) {
let current_generation = self.generation;
self.cache.retain(|_key, cached| {
cached.last_used == current_generation // only keep those that were used this frame
@@ -457,19 +605,17 @@ struct FontImplCache {
pixels_per_point: f32,
ab_glyph_fonts: BTreeMap<String, ab_glyph::FontArc>,
/// Map font names and size to the cached `FontImpl`.
/// Can't have f32 in a HashMap or BTreeMap, so let's do a linear search
cache: Vec<(String, f32, Arc<FontImpl>)>,
/// Map font pixel sizes and names to the cached `FontImpl`.
cache: ahash::AHashMap<(u32, String), Arc<FontImpl>>,
}
impl FontImplCache {
pub fn new(
atlas: Arc<Mutex<TextureAtlas>>,
pixels_per_point: f32,
definitions: &super::FontDefinitions,
font_data: &BTreeMap<String, FontData>,
) -> Self {
let ab_glyph_fonts = definitions
.font_data
let ab_glyph_fonts = font_data
.iter()
.map(|(name, font_data)| (name.clone(), ab_glyph_font_from_font_data(name, font_data)))
.collect();
@@ -482,42 +628,47 @@ impl FontImplCache {
}
}
pub fn ab_glyph_font(&self, font_name: &str) -> ab_glyph::FontArc {
self.ab_glyph_fonts
.get(font_name)
.unwrap_or_else(|| panic!("No font data found for {:?}", font_name))
.clone()
#[inline]
pub fn scale_as_pixels(&self, scale_in_points: f32) -> u32 {
let scale_in_pixels = self.pixels_per_point * scale_in_points;
// Round to an even number of physical pixels to get even kerning.
// See https://github.com/emilk/egui/issues/382
scale_in_pixels.round() as u32
}
pub fn font_impl(&mut self, font_name: &str, scale_in_points: f32) -> Arc<FontImpl> {
for entry in &self.cache {
if (entry.0.as_str(), entry.1) == (font_name, scale_in_points) {
return entry.2.clone();
}
}
pub fn font_impl(&mut self, scale_in_pixels: u32, font_name: &str) -> Arc<FontImpl> {
let scale_in_pixels = if font_name == "emoji-icon-font" {
(scale_in_pixels as f32 * 0.8).round() as u32 // TODO: remove font scale HACK!
} else {
scale_in_pixels
};
let y_offset = if font_name == "emoji-icon-font" {
scale_in_points * 0.235 // TODO: remove font alignment hack
let scale_in_points = scale_in_pixels as f32 / self.pixels_per_point;
scale_in_points * 0.29375 // TODO: remove font alignment hack
} else {
0.0
};
let y_offset = y_offset - 3.0; // Tweaked to make text look centered in buttons and text edit fields
let scale_in_points = if font_name == "emoji-icon-font" {
scale_in_points * 0.8 // TODO: remove HACK!
} else {
scale_in_points
};
let font_impl = Arc::new(FontImpl::new(
self.atlas.clone(),
self.pixels_per_point,
self.ab_glyph_font(font_name),
scale_in_points,
y_offset,
));
self.cache
.push((font_name.to_owned(), scale_in_points, font_impl.clone()));
font_impl
.entry((scale_in_pixels, font_name.to_owned()))
.or_insert_with(|| {
let ab_glyph_font = self
.ab_glyph_fonts
.get(font_name)
.unwrap_or_else(|| panic!("No font data found for {:?}", font_name))
.clone();
Arc::new(FontImpl::new(
self.atlas.clone(),
self.pixels_per_point,
ab_glyph_font,
scale_in_pixels,
y_offset,
))
})
.clone()
}
}