Shape refactor (#705)

* More introspection stats about vertices/indices etc

* more serde derive

* #[inline] to Shape constructors

* Introduce RectShape

* Introduce CircleShape

* Introduce PathShape

* More serde derive

* impl Copy for RectShape and CircleShape

* Simplify some code

* More serde derive

* Add helpers for appending more input or output

* Serde derives for RawInput

* Rename Fonts::from_definitions to Fonts::new

* Add Output::take

* refactor EguiGlium slightly

* Derive PartialEq for RawInput

* Improve egui::util::History interface

* tweaks

* Improve History filter: add minimum length

* Calculate galley bounding rect

* tessellator: cull line segments and paths

* tessellator: cull meshes

* Fix bug in History bandwidth estimator

egui/src/containers/collapsing_header.rs

@@ -305,7 +305,7 @@ impl CollapsingHeader {
             .unwrap_or_else(|| visuals.text_color());
 
         if ui.visuals().collapsing_header_frame || self.show_background {
-            ui.painter().add(Shape::Rect {
+            ui.painter().add(epaint::RectShape {
                 rect: header_response.rect.expand(visuals.expansion),
                 corner_radius: visuals.corner_radius,
                 fill: visuals.bg_fill,

egui/src/containers/combo_box.rs

@@ -238,7 +238,7 @@ fn button_frame(
 
     ui.painter().set(
         where_to_put_background,
-        Shape::Rect {
+        epaint::RectShape {
             rect: outer_rect.expand(visuals.expansion),
             corner_radius: visuals.corner_radius,
             fill: visuals.bg_fill,

egui/src/containers/frame.rs

@@ -178,12 +178,12 @@ impl Frame {
             stroke,
         } = *self;
 
-        let frame_shape = Shape::Rect {
+        let frame_shape = Shape::Rect(epaint::RectShape {
             rect: outer_rect,
             corner_radius,
             fill,
             stroke,
-        };
+        });
 
         if shadow == Default::default() {
             frame_shape

egui/src/containers/resize.rs

@@ -282,12 +282,11 @@ impl Resize {
         if self.with_stroke && corner_response.is_some() {
             let rect = Rect::from_min_size(content_ui.min_rect().left_top(), state.desired_size);
             let rect = rect.expand(2.0); // breathing room for content
-            ui.painter().add(epaint::Shape::Rect {
+            ui.painter().add(Shape::rect_stroke(
                 rect,
-                corner_radius: 3.0,
+                3.0,
-                fill: Default::default(),
+                ui.visuals().widgets.noninteractive.bg_stroke,
-                stroke: ui.visuals().widgets.noninteractive.bg_stroke,
+            ));
-            });
         }
 
         if let Some(corner_response) = corner_response {

egui/src/context.rs

@@ -569,7 +569,7 @@ impl Context {
             };
 
             if self.fonts.is_none() || new_font_definitions.is_some() || pixels_per_point_changed {
-                self.fonts = Some(Arc::new(Fonts::from_definitions(
+                self.fonts = Some(Arc::new(Fonts::new(
                     pixels_per_point,
                     new_font_definitions.unwrap_or_else(|| {
                         self.fonts

egui/src/data/input.rs

@@ -10,7 +10,8 @@ use crate::emath::*;
 /// [`crate::Context::wants_pointer_input`] and [`crate::Context::wants_keyboard_input`].
 ///
 /// All coordinates are in points (logical pixels) with origin (0, 0) in the top left corner.
-#[derive(Clone, Debug)]
+#[derive(Clone, Debug, PartialEq)]
+#[cfg_attr(feature = "persistence", derive(serde::Deserialize, serde::Serialize))]
 pub struct RawInput {
     /// How many points (logical pixels) the user scrolled
     pub scroll_delta: Vec2,
@@ -100,10 +101,38 @@ impl RawInput {
             dropped_files: std::mem::take(&mut self.dropped_files),
         }
     }
+
+    /// Add on new input.
+    pub fn append(&mut self, newer: Self) {
+        let Self {
+            scroll_delta,
+            zoom_delta,
+            screen_rect,
+            pixels_per_point,
+            time,
+            predicted_dt,
+            modifiers,
+            mut events,
+            mut hovered_files,
+            mut dropped_files,
+        } = newer;
+
+        self.scroll_delta += scroll_delta;
+        self.zoom_delta *= zoom_delta;
+        self.screen_rect = screen_rect.or(self.screen_rect);
+        self.pixels_per_point = pixels_per_point.or(self.pixels_per_point);
+        self.time = time; // use latest time
+        self.predicted_dt = predicted_dt; // use latest dt
+        self.modifiers = modifiers; // use latest
+        self.events.append(&mut events);
+        self.hovered_files.append(&mut hovered_files);
+        self.dropped_files.append(&mut dropped_files);
+    }
 }
 
 /// A file about to be dropped into egui.
-#[derive(Clone, Debug, Default)]
+#[derive(Clone, Debug, Default, PartialEq)]
+#[cfg_attr(feature = "persistence", derive(serde::Deserialize, serde::Serialize))]
 pub struct HoveredFile {
     /// Set by the `egui_glium` backend.
     pub path: Option<std::path::PathBuf>,
@@ -112,7 +141,8 @@ pub struct HoveredFile {
 }
 
 /// A file dropped into egui.
-#[derive(Clone, Debug, Default)]
+#[derive(Clone, Debug, Default, PartialEq)]
+#[cfg_attr(feature = "persistence", derive(serde::Deserialize, serde::Serialize))]
 pub struct DroppedFile {
     /// Set by the `egui_glium` backend.
     pub path: Option<std::path::PathBuf>,
@@ -128,6 +158,7 @@ pub struct DroppedFile {
 ///
 /// This only covers events that egui cares about.
 #[derive(Clone, Debug, PartialEq)]
+#[cfg_attr(feature = "persistence", derive(serde::Deserialize, serde::Serialize))]
 pub enum Event {
     /// The integration detected a "copy" event (e.g. Cmd+C).
     Copy,
@@ -186,6 +217,7 @@ pub enum Event {
 
 /// Mouse button (or similar for touch input)
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
+#[cfg_attr(feature = "persistence", derive(serde::Deserialize, serde::Serialize))]
 pub enum PointerButton {
     /// The primary mouse button is usually the left one.
     Primary = 0,
@@ -201,6 +233,7 @@ pub const NUM_POINTER_BUTTONS: usize = 3;
 
 /// State of the modifier keys. These must be fed to egui.
 #[derive(Clone, Copy, Debug, Default, Eq, PartialEq)]
+#[cfg_attr(feature = "persistence", derive(serde::Deserialize, serde::Serialize))]
 pub struct Modifiers {
     /// Either of the alt keys are down (option ⌥ on Mac).
     pub alt: bool,
@@ -350,16 +383,19 @@ impl RawInput {
 
 /// this is a `u64` as values of this kind can always be obtained by hashing
 #[derive(Clone, Copy, Debug, Eq, PartialEq, PartialOrd, Ord)]
+#[cfg_attr(feature = "persistence", derive(serde::Deserialize, serde::Serialize))]
 pub struct TouchDeviceId(pub u64);
 
 /// Unique identification of a touch occurrence (finger or pen or ...).
 /// A Touch ID is valid until the finger is lifted.
 /// A new ID is used for the next touch.
 #[derive(Clone, Copy, Debug, Eq, PartialEq, PartialOrd, Ord)]
+#[cfg_attr(feature = "persistence", derive(serde::Deserialize, serde::Serialize))]
 pub struct TouchId(pub u64);
 
 /// In what phase a touch event is in.
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
+#[cfg_attr(feature = "persistence", derive(serde::Deserialize, serde::Serialize))]
 pub enum TouchPhase {
     /// User just placed a touch point on the touch surface
     Start,

egui/src/data/output.rs

@@ -5,6 +5,7 @@ use crate::WidgetType;
 /// What egui emits each frame.
 /// The backend should use this.
 #[derive(Clone, Default, PartialEq)]
+#[cfg_attr(feature = "persistence", derive(serde::Deserialize, serde::Serialize))]
 pub struct Output {
     /// Set the cursor to this icon.
     pub cursor_icon: CursorIcon,
@@ -12,7 +13,9 @@ pub struct Output {
     /// If set, open this url.
     pub open_url: Option<OpenUrl>,
 
-    /// Response to [`crate::Event::Copy`] or [`crate::Event::Cut`]. Ignore if empty.
+    /// If set, put this text in the system clipboard. Ignore if empty.
+    ///
+    /// This is often a response to [`crate::Event::Copy`] or [`crate::Event::Cut`].
     pub copied_text: String,
 
     /// If `true`, egui is requesting immediate repaint (i.e. on the next frame).
@@ -53,9 +56,40 @@ impl Output {
         }
         Default::default()
     }
+
+    /// Add on new output.
+    pub fn append(&mut self, newer: Self) {
+        let Self {
+            cursor_icon,
+            open_url,
+            copied_text,
+            needs_repaint,
+            mut events,
+            text_cursor_pos,
+        } = newer;
+
+        self.cursor_icon = cursor_icon;
+        if open_url.is_some() {
+            self.open_url = open_url;
+        }
+        if !copied_text.is_empty() {
+            self.copied_text = copied_text;
+        }
+        self.needs_repaint = needs_repaint; // if the last frame doesn't need a repaint, then we don't need to repaint
+        self.events.append(&mut events);
+        self.text_cursor_pos = text_cursor_pos.or(self.text_cursor_pos);
+    }
+
+    /// Take everything ephemeral (everything except `cursor_icon` currently)
+    pub fn take(&mut self) -> Self {
+        let taken = std::mem::take(self);
+        self.cursor_icon = taken.cursor_icon; // eveything else is ephemeral
+        taken
+    }
 }
 
 #[derive(Clone, PartialEq)]
+#[cfg_attr(feature = "persistence", derive(serde::Deserialize, serde::Serialize))]
 pub struct OpenUrl {
     pub url: String,
     /// If `true`, open the url in a new tab.
@@ -88,6 +122,7 @@ impl OpenUrl {
 ///
 /// Loosely based on <https://developer.mozilla.org/en-US/docs/Web/CSS/cursor>.
 #[derive(Clone, Copy, Debug, PartialEq)]
+#[cfg_attr(feature = "persistence", derive(serde::Deserialize, serde::Serialize))]
 pub enum CursorIcon {
     /// Normal cursor icon, whatever that is.
     Default,
@@ -209,6 +244,7 @@ impl Default for CursorIcon {
 ///
 /// In particular, these events may be useful for accessability, i.e. for screen readers.
 #[derive(Clone, PartialEq)]
+#[cfg_attr(feature = "persistence", derive(serde::Deserialize, serde::Serialize))]
 pub enum OutputEvent {
     // A widget was clicked.
     Clicked(WidgetInfo),
@@ -236,6 +272,7 @@ impl std::fmt::Debug for OutputEvent {
 
 /// Describes a widget such as a [`crate::Button`] or a [`crate::TextEdit`].
 #[derive(Clone, PartialEq)]
+#[cfg_attr(feature = "persistence", derive(serde::Deserialize, serde::Serialize))]
 pub struct WidgetInfo {
     /// The type of widget this is.
     pub typ: WidgetType,

egui/src/input_state.rs

@@ -378,7 +378,7 @@ impl Default for PointerState {
             interact_pos: None,
             delta: Vec2::ZERO,
             velocity: Vec2::ZERO,
-            pos_history: History::new(1000, 0.1),
+            pos_history: History::new(0..1000, 0.1),
             down: Default::default(),
             press_origin: None,
             press_start_time: None,

egui/src/introspection.rs

@@ -89,6 +89,8 @@ impl Widget for &epaint::stats::PaintStats {
                 shape_path,
                 shape_mesh,
                 shape_vec,
+                text_shape_vertices,
+                text_shape_indices,
                 clipped_meshes,
                 vertices,
                 indices,
@@ -96,13 +98,19 @@ impl Widget for &epaint::stats::PaintStats {
 
             ui.label("Intermediate:");
             label(ui, shapes, "shapes").on_hover_text("Boxes, circles, etc");
-            label(ui, shape_text, "text");
+            label(ui, shape_text, "text (mostly cached)");
             label(ui, shape_path, "paths");
             label(ui, shape_mesh, "nested meshes");
             label(ui, shape_vec, "nested shapes");
             ui.add_space(10.0);
 
-            ui.label("Tessellated:");
+            ui.label("Text shapes:");
+            label(ui, text_shape_vertices, "vertices");
+            label(ui, text_shape_indices, "indices")
+                .on_hover_text("Three 32-bit indices per triangles");
+            ui.add_space(10.0);
+
+            ui.label("Tessellated (and culled):");
             label(ui, clipped_meshes, "clipped_meshes")
                 .on_hover_text("Number of separate clip rectangles");
             label(ui, vertices, "vertices");

egui/src/lib.rs

@@ -397,7 +397,7 @@ pub use {
 };
 
 pub mod text {
-    pub use epaint::text::{Galley, LayoutJob, LayoutSection, TextFormat, TAB_SIZE};
+    pub use epaint::text::{Fonts, Galley, LayoutJob, LayoutSection, TextFormat, TAB_SIZE};
 }
 
 // ----------------------------------------------------------------------------
@@ -527,6 +527,7 @@ pub mod special_emojis {
 
 /// The different types of built-in widgets in egui
 #[derive(Clone, Copy, Debug, PartialEq)]
+#[cfg_attr(feature = "persistence", derive(serde::Deserialize, serde::Serialize))]
 pub enum WidgetType {
     Label, // TODO: emit Label events
     Hyperlink,

egui/src/painter.rs

@@ -6,7 +6,7 @@ use crate::{
 use epaint::{
     mutex::Mutex,
     text::{Fonts, Galley, TextStyle},
-    Shape, Stroke, TextShape,
+    CircleShape, RectShape, Shape, Stroke, TextShape,
 };
 
 /// Helper to paint shapes and text to a specific region on a specific layer.
@@ -183,10 +183,11 @@ impl Painter {
     }
 
     /// Modify an existing [`Shape`].
-    pub fn set(&self, idx: ShapeIdx, mut shape: Shape) {
+    pub fn set(&self, idx: ShapeIdx, shape: impl Into<Shape>) {
         if self.fade_to_color == Some(Color32::TRANSPARENT) {
             return;
         }
+        let mut shape = shape.into();
         self.transform_shape(&mut shape);
         self.paint_list.lock().set(idx, self.clip_rect, shape)
     }
@@ -223,13 +224,11 @@ impl Painter {
         let galley = self.layout_no_wrap(text.to_string(), TextStyle::Monospace, color);
         let rect = anchor.anchor_rect(Rect::from_min_size(pos, galley.size()));
         let frame_rect = rect.expand(2.0);
-        self.add(Shape::Rect {
+        self.add(Shape::rect_filled(
-            rect: frame_rect,
+            frame_rect,
-            corner_radius: 0.0,
+            0.0,
-            fill: Color32::from_black_alpha(240),
+            Color32::from_black_alpha(240),
-            // stroke: Stroke::new(1.0, color),
+        ));
-            stroke: Default::default(),
-        });
         self.galley(rect.min, galley);
         frame_rect
     }
@@ -251,7 +250,7 @@ impl Painter {
         fill_color: impl Into<Color32>,
         stroke: impl Into<Stroke>,
     ) {
-        self.add(Shape::Circle {
+        self.add(CircleShape {
             center,
             radius,
             fill: fill_color.into(),
@@ -260,7 +259,7 @@ impl Painter {
     }
 
     pub fn circle_filled(&self, center: Pos2, radius: f32, fill_color: impl Into<Color32>) {
-        self.add(Shape::Circle {
+        self.add(CircleShape {
             center,
             radius,
             fill: fill_color.into(),
@@ -269,7 +268,7 @@ impl Painter {
     }
 
     pub fn circle_stroke(&self, center: Pos2, radius: f32, stroke: impl Into<Stroke>) {
-        self.add(Shape::Circle {
+        self.add(CircleShape {
             center,
             radius,
             fill: Default::default(),
@@ -284,7 +283,7 @@ impl Painter {
         fill_color: impl Into<Color32>,
         stroke: impl Into<Stroke>,
     ) {
-        self.add(Shape::Rect {
+        self.add(RectShape {
             rect,
             corner_radius,
             fill: fill_color.into(),
@@ -293,7 +292,7 @@ impl Painter {
     }
 
     pub fn rect_filled(&self, rect: Rect, corner_radius: f32, fill_color: impl Into<Color32>) {
-        self.add(Shape::Rect {
+        self.add(RectShape {
             rect,
             corner_radius,
             fill: fill_color.into(),
@@ -302,7 +301,7 @@ impl Painter {
     }
 
     pub fn rect_stroke(&self, rect: Rect, corner_radius: f32, stroke: impl Into<Stroke>) {
-        self.add(Shape::Rect {
+        self.add(RectShape {
             rect,
             corner_radius,
             fill: Default::default(),

egui/src/util/history.rs

@@ -2,11 +2,13 @@ use std::collections::VecDeque;
 
 /// This struct tracks recent values of some time series.
 ///
-/// One use is to show a log of recent events,
+/// It can be used as a smoothing filter for e.g. latency, fps etc,
-/// or show a graph over recent events.
+/// or to show a log or graph of recent events.
 ///
-/// It has both a maximum length and a maximum storage time.
+/// It has a minimum and maximum length, as well as a maximum storage time.
-/// Elements are dropped when either max length or max age is reached.
+/// * The minimum length is to ensure you have enough data for an estimate.
+/// * The maximum length is to make sure the history doesn't take up too much space.
+/// * The maximum age is to make sure the estimate isn't outdated.
 ///
 /// Time difference between values can be zero, but never negative.
 ///
@@ -15,11 +17,15 @@ use std::collections::VecDeque;
 /// All times are in seconds.
 #[derive(Clone, Debug)]
 pub struct History<T> {
-    /// In elements, i.e. of `values.len()`
+    /// In elements, i.e. of `values.len()`.
+    /// The length is initially zero, but once past `min_len` will not shrink below it.
+    min_len: usize,
+
+    /// In elements, i.e. of `values.len()`.
     max_len: usize,
 
-    /// In seconds
+    /// In seconds.
-    max_age: f64, // TODO: f32
+    max_age: f32,
 
     /// Total number of elements seen ever
     total_count: u64,
@@ -33,13 +39,22 @@ impl<T> History<T>
 where
     T: Copy,
 {
-    pub fn new(max_len: usize, max_age: f64) -> Self {
+    /// Example:
-        Self::from_max_len_age(max_len, max_age)
+    /// ```
-    }
+    /// # use egui::util::History;
-
+    /// # fn now() -> f64 { 0.0 }
-    pub fn from_max_len_age(max_len: usize, max_age: f64) -> Self {
+    /// // Drop events that are older than one second,
+    /// // as long we keep at least two events. Never keep more than a hundred events.
+    /// let mut history = History::new(2..100, 1.0);
+    /// assert_eq!(history.average(), None);
+    /// history.add(now(), 40.0_f32);
+    /// history.add(now(), 44.0_f32);
+    /// assert_eq!(history.average(), Some(42.0));
+    /// ```
+    pub fn new(length_range: std::ops::Range<usize>, max_age: f32) -> Self {
         Self {
-            max_len,
+            min_len: length_range.start,
+            max_len: length_range.end,
             max_age,
             total_count: 0,
             values: Default::default(),
@@ -51,7 +66,7 @@ where
     }
 
     pub fn max_age(&self) -> f32 {
-        self.max_age as f32
+        self.max_age
     }
 
     pub fn is_empty(&self) -> bool {
@@ -125,17 +140,26 @@ where
         }
     }
 
+    // Mean number of events per second.
+    pub fn rate(&self) -> Option<f32> {
+        self.mean_time_interval().map(|time| 1.0 / time)
+    }
+
     /// Remove samples that are too old
     pub fn flush(&mut self, now: f64) {
         while self.values.len() > self.max_len {
             self.values.pop_front();
         }
-        while let Some((front_time, _)) = self.values.front() {
+        while self.values.len() > self.min_len {
-            if *front_time < now - self.max_age {
+            if let Some((front_time, _)) = self.values.front() {
+                if *front_time < now - (self.max_age as f64) {
                     self.values.pop_front();
                 } else {
                     break;
                 }
+            } else {
+                break;
+            }
         }
     }
 }
@@ -160,6 +184,21 @@ where
     }
 }
 
+impl<T> History<T>
+where
+    T: Copy,
+    T: std::iter::Sum,
+    T: std::ops::Div<f32, Output = T>,
+    T: std::ops::Mul<f32, Output = T>,
+{
+    /// Average times rate.
+    /// If you are keeping track of individual sizes of things (e.g. bytes),
+    /// this will estimate the bandwidth (bytes per second).
+    pub fn bandwidth(&self) -> Option<T> {
+        Some(self.average()? * self.rate()?)
+    }
+}
+
 impl<T, Vel> History<T>
 where
     T: Copy,

egui/src/widgets/button.rs

@@ -309,7 +309,7 @@ impl<'a> Widget for Checkbox<'a> {
             rect.center().y - 0.5 * galley.size().y,
         );
         let (small_icon_rect, big_icon_rect) = ui.spacing().icon_rectangles(rect);
-        ui.painter().add(Shape::Rect {
+        ui.painter().add(epaint::RectShape {
             rect: big_icon_rect.expand(visuals.expansion),
             corner_radius: visuals.corner_radius,
             fill: visuals.bg_fill,
@@ -433,7 +433,7 @@ impl Widget for RadioButton {
 
         let painter = ui.painter();
 
-        painter.add(Shape::Circle {
+        painter.add(epaint::CircleShape {
             center: big_icon_rect.center(),
             radius: big_icon_rect.width() / 2.0 + visuals.expansion,
             fill: visuals.bg_fill,
@@ -441,7 +441,7 @@ impl Widget for RadioButton {
         });
 
         if checked {
-            painter.add(Shape::Circle {
+            painter.add(epaint::CircleShape {
                 center: small_icon_rect.center(),
                 radius: small_icon_rect.width() / 3.0,
                 fill: visuals.fg_stroke.color, // Intentional to use stroke and not fill

egui/src/widgets/color_picker.rs

@@ -57,7 +57,7 @@ fn show_hsva(ui: &mut Ui, color: Hsva, desired_size: Vec2) -> Response {
         ui.painter().rect_filled(left, 0.0, color);
         ui.painter().rect_filled(right, 0.0, color.to_opaque());
     } else {
-        ui.painter().add(Shape::Rect {
+        ui.painter().add(RectShape {
             rect,
             corner_radius: 2.0,
             fill: color.into(),
@@ -190,7 +190,7 @@ fn color_slider_2d(
     let x = lerp(rect.left()..=rect.right(), *x_value);
     let y = lerp(rect.bottom()..=rect.top(), *y_value);
     let picked_color = color_at(*x_value, *y_value);
-    ui.painter().add(Shape::Circle {
+    ui.painter().add(epaint::CircleShape {
         center: pos2(x, y),
         radius: rect.width() / 12.0,
         fill: picked_color,

egui/src/widgets/plot/items.rs

@@ -800,12 +800,7 @@ impl PlotItem for Polygon {
 
         let fill = Rgba::from(stroke.color).to_opaque().multiply(fill_alpha);
 
-        let shape = Shape::Path {
+        let shape = Shape::convex_polygon(values_tf.clone(), fill, Stroke::none());
-            points: values_tf.clone(),
-            closed: true,
-            fill: fill.into(),
-            stroke: Stroke::none(),
-        };
         shapes.push(shape);
         values_tf.push(*values_tf.first().unwrap());
         style.style_line(values_tf, *stroke, *highlight, shapes);
@@ -1081,21 +1076,16 @@ impl PlotItem for Points {
 
                 match shape {
                     MarkerShape::Circle => {
-                        shapes.push(Shape::Circle {
+                        shapes.push(Shape::Circle(epaint::CircleShape {
                             center,
                             radius,
                             fill,
                             stroke,
-                        });
+                        }));
                     }
                     MarkerShape::Diamond => {
                         let points = vec![tf(1.0, 0.0), tf(0.0, -1.0), tf(-1.0, 0.0), tf(0.0, 1.0)];
-                        shapes.push(Shape::Path {
+                        shapes.push(Shape::convex_polygon(points, fill, stroke));
-                            points,
-                            closed: true,
-                            fill,
-                            stroke,
-                        });
                     }
                     MarkerShape::Square => {
                         let points = vec![
@@ -1104,12 +1094,7 @@ impl PlotItem for Points {
                             tf(-frac_1_sqrt_2, -frac_1_sqrt_2),
                             tf(-frac_1_sqrt_2, frac_1_sqrt_2),
                         ];
-                        shapes.push(Shape::Path {
+                        shapes.push(Shape::convex_polygon(points, fill, stroke));
-                            points,
-                            closed: true,
-                            fill,
-                            stroke,
-                        });
                     }
                     MarkerShape::Cross => {
                         let diagonal1 = [
@@ -1132,12 +1117,7 @@ impl PlotItem for Points {
                     MarkerShape::Up => {
                         let points =
                             vec![tf(0.0, -1.0), tf(-0.5 * sqrt_3, 0.5), tf(0.5 * sqrt_3, 0.5)];
-                        shapes.push(Shape::Path {
+                        shapes.push(Shape::convex_polygon(points, fill, stroke));
-                            points,
-                            closed: true,
-                            fill,
-                            stroke,
-                        });
                     }
                     MarkerShape::Down => {
                         let points = vec![
@@ -1145,22 +1125,12 @@ impl PlotItem for Points {
                             tf(-0.5 * sqrt_3, -0.5),
                             tf(0.5 * sqrt_3, -0.5),
                         ];
-                        shapes.push(Shape::Path {
+                        shapes.push(Shape::convex_polygon(points, fill, stroke));
-                            points,
-                            closed: true,
-                            fill,
-                            stroke,
-                        });
                     }
                     MarkerShape::Left => {
                         let points =
                             vec![tf(-1.0, 0.0), tf(0.5, -0.5 * sqrt_3), tf(0.5, 0.5 * sqrt_3)];
-                        shapes.push(Shape::Path {
+                        shapes.push(Shape::convex_polygon(points, fill, stroke));
-                            points,
-                            closed: true,
-                            fill,
-                            stroke,
-                        });
                     }
                     MarkerShape::Right => {
                         let points = vec![
@@ -1168,12 +1138,7 @@ impl PlotItem for Points {
                             tf(-0.5, -0.5 * sqrt_3),
                             tf(-0.5, 0.5 * sqrt_3),
                         ];
-                        shapes.push(Shape::Path {
+                        shapes.push(Shape::convex_polygon(points, fill, stroke));
-                            points,
-                            closed: true,
-                            fill,
-                            stroke,
-                        });
                     }
                     MarkerShape::Asterisk => {
                         let vertical = [tf(0.0, -1.0), tf(0.0, 1.0)];

egui/src/widgets/plot/legend.rs

@@ -117,7 +117,7 @@ impl LegendEntry {
 
         let painter = ui.painter();
 
-        painter.add(Shape::Circle {
+        painter.add(epaint::CircleShape {
             center: icon_rect.center(),
             radius: icon_size * 0.5,
             fill: visuals.bg_fill,
@@ -130,12 +130,11 @@ impl LegendEntry {
             } else {
                 *color
             };
-            painter.add(Shape::Circle {
+            painter.add(epaint::Shape::circle_filled(
-                center: icon_rect.center(),
+                icon_rect.center(),
-                radius: icon_size * 0.4,
+                icon_size * 0.4,
                 fill,
-                stroke: Default::default(),
+            ));
-            });
         }
 
         let text_position_x = if label_on_the_left {

egui/src/widgets/plot/mod.rs

@@ -404,7 +404,7 @@ impl Widget for Plot {
 
         // Background
         if show_background {
-            plot_painter.add(Shape::Rect {
+            plot_painter.add(epaint::RectShape {
                 rect,
                 corner_radius: 2.0,
                 fill: ui.visuals().extreme_bg_color,

egui/src/widgets/progress_bar.rs

@@ -116,12 +116,10 @@ impl Widget for ProgressBar {
                         + vec2(-corner_radius, 0.0)
                 })
                 .collect();
-            ui.painter().add(Shape::Path {
+            ui.painter().add(Shape::line(
                 points,
-                closed: false,
+                Stroke::new(2.0, visuals.faint_bg_color),
-                fill: Color32::TRANSPARENT,
+            ));
-                stroke: Stroke::new(2.0, visuals.faint_bg_color),
-            });
         }
 
         if let Some(text_kind) = text {

egui/src/widgets/slider.rs

@@ -333,7 +333,7 @@ impl<'a> Slider<'a> {
             let marker_center_x = self.x_from_value(value, x_range);
 
             let visuals = ui.style().interact(response);
-            ui.painter().add(Shape::Rect {
+            ui.painter().add(epaint::RectShape {
                 rect: rail_rect,
                 corner_radius: ui.visuals().widgets.inactive.corner_radius,
                 fill: ui.visuals().widgets.inactive.bg_fill,
@@ -344,7 +344,7 @@ impl<'a> Slider<'a> {
                 // stroke: ui.visuals().widgets.inactive.bg_stroke,
             });
 
-            ui.painter().add(Shape::Circle {
+            ui.painter().add(epaint::CircleShape {
                 center: pos2(marker_center_x, rail_rect.center().y),
                 radius: handle_radius(rect) + visuals.expansion,
                 fill: visuals.bg_fill,

egui/src/widgets/text_edit.rs

@@ -425,7 +425,7 @@ impl<'t, S: TextBuffer> Widget for TextEdit<'t, S> {
             let visuals = ui.style().interact(&response);
             let frame_rect = response.rect.expand(visuals.expansion);
             let shape = if response.has_focus() {
-                Shape::Rect {
+                epaint::RectShape {
                     rect: frame_rect,
                     corner_radius: visuals.corner_radius,
                     // fill: ui.visuals().selection.bg_fill,
@@ -433,7 +433,7 @@ impl<'t, S: TextBuffer> Widget for TextEdit<'t, S> {
                     stroke: ui.visuals().selection.stroke,
                 }
             } else {
-                Shape::Rect {
+                epaint::RectShape {
                     rect: frame_rect,
                     corner_radius: visuals.corner_radius,
                     fill: ui.visuals().extreme_bg_color,

egui_demo_lib/benches/benchmark.rs

@@ -70,10 +70,8 @@ pub fn criterion_benchmark(c: &mut Criterion) {
         let wrap_width = 512.0;
         let text_style = egui::TextStyle::Body;
         let color = egui::Color32::WHITE;
-        let fonts = egui::epaint::text::Fonts::from_definitions(
+        let fonts =
-            pixels_per_point,
+            egui::epaint::text::Fonts::new(pixels_per_point, egui::FontDefinitions::default());
-            egui::FontDefinitions::default(),
-        );
         c.bench_function("text_layout_uncached", |b| {
             b.iter(|| {
                 use egui::epaint::text::{layout, LayoutJob};

egui_demo_lib/src/apps/demo/drag_and_drop.rs

@@ -65,7 +65,7 @@ pub fn drop_target<R>(
 
     ui.painter().set(
         where_to_put_background,
-        Shape::Rect {
+        epaint::RectShape {
             corner_radius: style.corner_radius,
             fill,
             stroke,

egui_demo_lib/src/frame_history.rs

@@ -6,9 +6,10 @@ pub struct FrameHistory {
 
 impl Default for FrameHistory {
     fn default() -> Self {
-        let max_age: f64 = 1.0;
+        let max_age: f32 = 1.0;
+        let max_len = (max_age * 300.0).round() as usize;
         Self {
-            frame_times: History::from_max_len_age((max_age * 300.0).round() as usize, max_age),
+            frame_times: History::new(0..max_len, max_age),
         }
     }
 }
@@ -73,12 +74,12 @@ impl FrameHistory {
         let to_screen = emath::RectTransform::from_to(graph_rect, rect);
 
         let mut shapes = Vec::with_capacity(3 + 2 * history.len());
-        shapes.push(Shape::Rect {
+        shapes.push(Shape::Rect(epaint::RectShape {
             rect,
             corner_radius: style.corner_radius,
             fill: ui.visuals().extreme_bg_color,
             stroke: ui.style().noninteractive().bg_stroke,
-        });
+        }));
 
         let rect = rect.shrink(4.0);
         let color = ui.visuals().text_color();

egui_glium/src/lib.rs

@@ -34,7 +34,6 @@ use {
 };
 
 pub use copypasta::ClipboardContext;
-use std::borrow::BorrowMut; // TODO: remove
 
 pub struct GliumInputState {
     pub pointer_pos_in_points: Option<Pos2>,
@@ -556,10 +555,21 @@ impl EguiGlium {
         &self.egui_ctx
     }
 
+    pub fn painter_mut(&mut self) -> &mut crate::Painter {
+        &mut self.painter
+    }
+
     pub fn ctx_and_painter_mut(&mut self) -> (&egui::CtxRef, &mut crate::Painter) {
         (&self.egui_ctx, &mut self.painter)
     }
 
+    pub fn pixels_per_point(&self) -> f32 {
+        self.input_state
+            .raw
+            .pixels_per_point
+            .unwrap_or_else(|| self.egui_ctx.pixels_per_point())
+    }
+
     pub fn on_event(&mut self, event: &glium::glutin::event::WindowEvent<'_>) {
         crate::input_to_egui(
             self.egui_ctx.pixels_per_point(),
@@ -575,13 +585,19 @@ impl EguiGlium {
     }
 
     pub fn begin_frame(&mut self, display: &glium::Display) {
-        let pixels_per_point = self
+        let raw_input = self.take_raw_input(display);
-            .input_state
+        self.begin_frame_with_input(raw_input);
-            .raw
+    }
-            .pixels_per_point
-            .unwrap_or_else(|| self.egui_ctx.pixels_per_point());
 
-        self.input_state.raw.time = Some(self.start_time.elapsed().as_nanos() as f64 * 1e-9);
+    pub fn begin_frame_with_input(&mut self, raw_input: RawInput) {
+        self.egui_ctx.begin_frame(raw_input);
+    }
+
+    /// Prepare for a new frame. Normally you would call [`Self::begin_frame`] instead.
+    pub fn take_raw_input(&mut self, display: &glium::Display) -> egui::RawInput {
+        let pixels_per_point = self.pixels_per_point();
+
+        self.input_state.raw.time = Some(self.start_time.elapsed().as_secs_f64());
 
         // On Windows, a minimized window will have 0 width and height.
         // See: https://github.com/rust-windowing/winit/issues/208
@@ -596,7 +612,7 @@ impl EguiGlium {
             None
         };
 
-        self.egui_ctx.begin_frame(self.input_state.raw.take());
+        self.input_state.raw.take()
     }
 
     /// Returns `needs_repaint` and shapes to draw.
@@ -605,10 +621,16 @@ impl EguiGlium {
         display: &glium::Display,
     ) -> (bool, Vec<egui::epaint::ClippedShape>) {
         let (egui_output, shapes) = self.egui_ctx.end_frame();
+        let needs_repaint = egui_output.needs_repaint;
+        self.handle_output(display, egui_output);
+        (needs_repaint, shapes)
+    }
 
+    pub fn handle_output(&mut self, display: &glium::Display, egui_output: egui::Output) {
         if self.egui_ctx.memory().options.screen_reader {
             self.screen_reader.speak(&egui_output.events_description());
         }
+
         if self.current_cursor_icon != egui_output.cursor_icon {
             // call only when changed to prevent flickering near frame boundary
             // when Windows OS tries to control cursor icon for window resizing
@@ -616,11 +638,7 @@ impl EguiGlium {
             self.current_cursor_icon = egui_output.cursor_icon;
         }
 
-        let needs_repaint = egui_output.needs_repaint;
-
         handle_output(egui_output, self.clipboard.as_mut(), display);
-
-        (needs_repaint, shapes)
     }
 
     pub fn paint<T: glium::Surface>(
@@ -638,8 +656,4 @@ impl EguiGlium {
             &self.egui_ctx.texture(),
         );
     }
-
-    pub fn painter_mut(&mut self) -> &mut Painter {
-        self.painter.borrow_mut()
-    }
 }

emath/src/rect.rs

@@ -88,6 +88,15 @@ impl Rect {
         }
     }
 
+    /// Bounding-box around the points
+    pub fn from_points(points: &[Pos2]) -> Self {
+        let mut rect = Rect::NOTHING;
+        for &p in points {
+            rect.extend_with(p);
+        }
+        rect
+    }
+
     /// A `Rect` that contains every point to the right of the given X coordinate.
     #[inline]
     pub fn everything_right_of(left_x: f32) -> Self {
@@ -165,15 +174,6 @@ impl Rect {
         )
     }
 
-    /// The intersection of two `Rect`, i.e. the area covered by both.
-    #[must_use]
-    pub fn intersect(self, other: Rect) -> Self {
-        Self {
-            min: self.min.max(other.min),
-            max: self.max.min(other.max),
-        }
-    }
-
     #[must_use]
     #[inline]
     pub fn intersects(self, other: Rect) -> bool {
@@ -236,7 +236,10 @@ impl Rect {
         self.max.y = self.max.y.max(y);
     }
 
+    /// The union of two bounding rectangle, i.e. the minimum `Rect`
+    /// that contains both input rectangles.
     #[inline(always)]
+    #[must_use]
     pub fn union(self, other: Rect) -> Rect {
         Rect {
             min: self.min.min(other.min),
@@ -244,6 +247,16 @@ impl Rect {
         }
     }
 
+    /// The intersection of two `Rect`, i.e. the area covered by both.
+    #[inline]
+    #[must_use]
+    pub fn intersect(self, other: Rect) -> Self {
+        Self {
+            min: self.min.max(other.min),
+            max: self.max.min(other.max),
+        }
+    }
+
     #[inline(always)]
     pub fn center(&self) -> Pos2 {
         Pos2 {

epaint/src/lib.rs

@@ -87,7 +87,7 @@ pub use {
     color::{Color32, Rgba},
     mesh::{Mesh, Mesh16, Vertex},
     shadow::Shadow,
-    shape::{Shape, TextShape},
+    shape::{CircleShape, PathShape, RectShape, Shape, TextShape},
     stats::PaintStats,
     stroke::Stroke,
     tessellator::{TessellationOptions, Tessellator},
@@ -95,6 +95,8 @@ pub use {
     texture_atlas::{Texture, TextureAtlas},
 };
 
+pub use emath::{pos2, vec2, Pos2, Rect, Vec2};
+
 pub use ahash;
 pub use emath;
 
@@ -106,6 +108,7 @@ pub const WHITE_UV: emath::Pos2 = emath::pos2(0.0, 0.0);
 
 /// What texture to use in a [`Mesh`] mesh.
 #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
+#[cfg_attr(feature = "persistence", derive(serde::Deserialize, serde::Serialize))]
 pub enum TextureId {
     /// The egui font texture.
     /// If you don't want to use a texture, pick this and the [`WHITE_UV`] for uv-coord.
@@ -122,14 +125,6 @@ impl Default for TextureId {
     }
 }
 
-pub(crate) struct PaintRect {
-    pub rect: emath::Rect,
-    /// How rounded the corners are. Use `0.0` for no rounding.
-    pub corner_radius: f32,
-    pub fill: Color32,
-    pub stroke: Stroke,
-}
-
 /// A [`Shape`] within a clip rectangle.
 ///
 /// Everything is using logical points.
@@ -146,6 +141,7 @@ pub struct ClippedShape(
 ///
 /// Everything is using logical points.
 #[derive(Clone, Debug)]
+#[cfg_attr(feature = "persistence", derive(serde::Deserialize, serde::Serialize))]
 pub struct ClippedMesh(
     /// Clip / scissor rectangle.
     /// Only show the part of the [`Mesh`] that falls within this.

epaint/src/mesh.rs

@@ -6,6 +6,7 @@ use emath::*;
 /// Should be friendly to send to GPU as is.
 #[repr(C)]
 #[derive(Clone, Copy, Debug, Default, PartialEq)]
+#[cfg_attr(feature = "persistence", derive(serde::Deserialize, serde::Serialize))]
 pub struct Vertex {
     /// Logical pixel coordinates (points).
     /// (0,0) is the top left corner of the screen.
@@ -22,6 +23,7 @@ pub struct Vertex {
 
 /// Textured triangles in two dimensions.
 #[derive(Clone, Debug, Default, PartialEq)]
+#[cfg_attr(feature = "persistence", derive(serde::Deserialize, serde::Serialize))]
 pub struct Mesh {
     /// Draw as triangles (i.e. the length is always multiple of three).
     ///

epaint/src/shadow.rs

@@ -52,12 +52,11 @@ impl Shadow {
         let Self { extrusion, color } = *self;
 
         use crate::tessellator::*;
-        let rect = PaintRect {
+        let rect = RectShape::filled(
-            rect: rect.expand(0.5 * extrusion),
+            rect.expand(0.5 * extrusion),
-            corner_radius: corner_radius + 0.5 * extrusion,
+            corner_radius + 0.5 * extrusion,
-            fill: color,
+            color,
-            stroke: Default::default(),
+        );
-        };
         let mut tessellator = Tessellator::from_options(TessellationOptions {
             aa_size: extrusion,
             anti_alias: true,

epaint/src/shape.rs

@@ -14,32 +14,13 @@ pub enum Shape {
     /// Recursively nest more shapes - sometimes a convenience to be able to do.
     /// For performance reasons it is better to avoid it.
     Vec(Vec<Shape>),
-    Circle {
+    Circle(CircleShape),
-        center: Pos2,
-        radius: f32,
-        fill: Color32,
-        stroke: Stroke,
-    },
     LineSegment {
         points: [Pos2; 2],
         stroke: Stroke,
     },
-    Path {
+    Path(PathShape),
-        points: Vec<Pos2>,
+    Rect(RectShape),
-        /// If true, connect the first and last of the points together.
-        /// This is required if `fill != TRANSPARENT`.
-        closed: bool,
-        /// Fill is only supported for convex polygons.
-        fill: Color32,
-        stroke: Stroke,
-    },
-    Rect {
-        rect: Rect,
-        /// How rounded the corners are. Use `0.0` for no rounding.
-        corner_radius: f32,
-        fill: Color32,
-        stroke: Stroke,
-    },
     Text(TextShape),
     Mesh(Mesh),
 }
@@ -48,6 +29,7 @@ pub enum Shape {
 impl Shape {
     /// A line between two points.
     /// More efficient than calling [`Self::line`].
+    #[inline]
     pub fn line_segment(points: [Pos2; 2], stroke: impl Into<Stroke>) -> Self {
         Self::LineSegment {
             points,
@@ -58,23 +40,15 @@ impl Shape {
     /// A line through many points.
     ///
     /// Use [`Self::line_segment`] instead if your line only connects two points.
+    #[inline]
     pub fn line(points: Vec<Pos2>, stroke: impl Into<Stroke>) -> Self {
-        Self::Path {
+        Self::Path(PathShape::line(points, stroke))
-            points,
-            closed: false,
-            fill: Default::default(),
-            stroke: stroke.into(),
-        }
     }
 
     /// A line that closes back to the start point again.
+    #[inline]
     pub fn closed_line(points: Vec<Pos2>, stroke: impl Into<Stroke>) -> Self {
-        Self::Path {
+        Self::Path(PathShape::closed_line(points, stroke))
-            points,
-            closed: true,
-            fill: Default::default(),
-            stroke: stroke.into(),
-        }
     }
 
     /// Turn a line into equally spaced dots.
@@ -102,53 +76,33 @@ impl Shape {
     }
 
     /// A convex polygon with a fill and optional stroke.
+    #[inline]
     pub fn convex_polygon(
         points: Vec<Pos2>,
         fill: impl Into<Color32>,
         stroke: impl Into<Stroke>,
     ) -> Self {
-        Self::Path {
+        Self::Path(PathShape::convex_polygon(points, fill, stroke))
-            points,
-            closed: true,
-            fill: fill.into(),
-            stroke: stroke.into(),
-        }
     }
 
+    #[inline]
     pub fn circle_filled(center: Pos2, radius: f32, fill_color: impl Into<Color32>) -> Self {
-        Self::Circle {
+        Self::Circle(CircleShape::filled(center, radius, fill_color))
-            center,
-            radius,
-            fill: fill_color.into(),
-            stroke: Default::default(),
-        }
     }
 
+    #[inline]
     pub fn circle_stroke(center: Pos2, radius: f32, stroke: impl Into<Stroke>) -> Self {
-        Self::Circle {
+        Self::Circle(CircleShape::stroke(center, radius, stroke))
-            center,
-            radius,
-            fill: Default::default(),
-            stroke: stroke.into(),
-        }
     }
 
+    #[inline]
     pub fn rect_filled(rect: Rect, corner_radius: f32, fill_color: impl Into<Color32>) -> Self {
-        Self::Rect {
+        Self::Rect(RectShape::filled(rect, corner_radius, fill_color))
-            rect,
-            corner_radius,
-            fill: fill_color.into(),
-            stroke: Default::default(),
-        }
     }
 
+    #[inline]
     pub fn rect_stroke(rect: Rect, corner_radius: f32, stroke: impl Into<Stroke>) -> Self {
-        Self::Rect {
+        Self::Rect(RectShape::stroke(rect, corner_radius, stroke))
-            rect,
-            corner_radius,
-            fill: Default::default(),
-            stroke: stroke.into(),
-        }
     }
 
     #[allow(clippy::needless_pass_by_value)]
@@ -165,6 +119,7 @@ impl Shape {
         Self::galley(rect.min, galley)
     }
 
+    #[inline]
     pub fn galley(pos: Pos2, galley: std::sync::Arc<Galley>) -> Self {
         TextShape::new(pos, galley).into()
     }
@@ -172,7 +127,165 @@ impl Shape {
 
 // ----------------------------------------------------------------------------
 
-/// How to draw some text on screen.
+/// How to paint a circle.
+#[derive(Copy, Clone, Debug, PartialEq)]
+#[cfg_attr(feature = "persistence", derive(serde::Deserialize, serde::Serialize))]
+pub struct CircleShape {
+    pub center: Pos2,
+    pub radius: f32,
+    pub fill: Color32,
+    pub stroke: Stroke,
+}
+
+impl CircleShape {
+    #[inline]
+    pub fn filled(center: Pos2, radius: f32, fill_color: impl Into<Color32>) -> Self {
+        Self {
+            center,
+            radius,
+            fill: fill_color.into(),
+            stroke: Default::default(),
+        }
+    }
+
+    #[inline]
+    pub fn stroke(center: Pos2, radius: f32, stroke: impl Into<Stroke>) -> Self {
+        Self {
+            center,
+            radius,
+            fill: Default::default(),
+            stroke: stroke.into(),
+        }
+    }
+}
+
+impl From<CircleShape> for Shape {
+    #[inline(always)]
+    fn from(shape: CircleShape) -> Self {
+        Self::Circle(shape)
+    }
+}
+
+// ----------------------------------------------------------------------------
+
+/// A path which can be stroked and/or filled (if closed).
+#[derive(Clone, Debug, PartialEq)]
+#[cfg_attr(feature = "persistence", derive(serde::Deserialize, serde::Serialize))]
+pub struct PathShape {
+    pub points: Vec<Pos2>,
+    /// If true, connect the first and last of the points together.
+    /// This is required if `fill != TRANSPARENT`.
+    pub closed: bool,
+    /// Fill is only supported for convex polygons.
+    pub fill: Color32,
+    pub stroke: Stroke,
+}
+
+impl PathShape {
+    /// A line through many points.
+    ///
+    /// Use [`Shape::line_segment`] instead if your line only connects two points.
+    #[inline]
+    pub fn line(points: Vec<Pos2>, stroke: impl Into<Stroke>) -> Self {
+        PathShape {
+            points,
+            closed: false,
+            fill: Default::default(),
+            stroke: stroke.into(),
+        }
+    }
+
+    /// A line that closes back to the start point again.
+    #[inline]
+    pub fn closed_line(points: Vec<Pos2>, stroke: impl Into<Stroke>) -> Self {
+        PathShape {
+            points,
+            closed: true,
+            fill: Default::default(),
+            stroke: stroke.into(),
+        }
+    }
+
+    /// A convex polygon with a fill and optional stroke.
+    #[inline]
+    pub fn convex_polygon(
+        points: Vec<Pos2>,
+        fill: impl Into<Color32>,
+        stroke: impl Into<Stroke>,
+    ) -> Self {
+        PathShape {
+            points,
+            closed: true,
+            fill: fill.into(),
+            stroke: stroke.into(),
+        }
+    }
+
+    /// Screen-space bounding rectangle.
+    #[inline]
+    pub fn bounding_rect(&self) -> Rect {
+        Rect::from_points(&self.points).expand(self.stroke.width)
+    }
+}
+
+impl From<PathShape> for Shape {
+    #[inline(always)]
+    fn from(shape: PathShape) -> Self {
+        Self::Path(shape)
+    }
+}
+
+// ----------------------------------------------------------------------------
+
+/// How to paint a rectangle.
+#[derive(Copy, Clone, Debug, PartialEq)]
+#[cfg_attr(feature = "persistence", derive(serde::Deserialize, serde::Serialize))]
+pub struct RectShape {
+    pub rect: Rect,
+    /// How rounded the corners are. Use `0.0` for no rounding.
+    pub corner_radius: f32,
+    pub fill: Color32,
+    pub stroke: Stroke,
+}
+
+impl RectShape {
+    #[inline]
+    pub fn filled(rect: Rect, corner_radius: f32, fill_color: impl Into<Color32>) -> Self {
+        Self {
+            rect,
+            corner_radius,
+            fill: fill_color.into(),
+            stroke: Default::default(),
+        }
+    }
+
+    #[inline]
+    pub fn stroke(rect: Rect, corner_radius: f32, stroke: impl Into<Stroke>) -> Self {
+        Self {
+            rect,
+            corner_radius,
+            fill: Default::default(),
+            stroke: stroke.into(),
+        }
+    }
+
+    /// Screen-space bounding rectangle.
+    #[inline]
+    pub fn bounding_rect(&self) -> Rect {
+        self.rect.expand(self.stroke.width)
+    }
+}
+
+impl From<RectShape> for Shape {
+    #[inline(always)]
+    fn from(shape: RectShape) -> Self {
+        Self::Rect(shape)
+    }
+}
+
+// ----------------------------------------------------------------------------
+
+/// How to paint some text on screen.
 #[derive(Clone, Debug, PartialEq)]
 pub struct TextShape {
     /// Top left corner of the first character.
@@ -206,12 +319,18 @@ impl TextShape {
             angle: 0.0,
         }
     }
+
+    /// Screen-space bounding rectangle.
+    #[inline]
+    pub fn bounding_rect(&self) -> Rect {
+        self.galley.mesh_bounds.translate(self.pos.to_vec2())
+    }
 }
 
 impl From<TextShape> for Shape {
     #[inline(always)]
-    fn from(text_shape: TextShape) -> Self {
+    fn from(shape: TextShape) -> Self {
-        Self::Text(text_shape)
+        Self::Text(shape)
     }
 }
 
@@ -259,7 +378,7 @@ fn dashes_from_line(
             let new_point = start + vector * (position_on_segment / segment_length);
             if drawing_dash {
                 // This is the end point.
-                if let Shape::Path { points, .. } = shapes.last_mut().unwrap() {
+                if let Shape::Path(PathShape { points, .. }) = shapes.last_mut().unwrap() {
                     points.push(new_point);
                 }
                 position_on_segment += gap_length;
@@ -272,7 +391,7 @@ fn dashes_from_line(
         }
         // If the segment ends and the dash is not finished, add the segment's end point.
         if drawing_dash {
-            if let Shape::Path { points, .. } = shapes.last_mut().unwrap() {
+            if let Shape::Path(PathShape { points, .. }) = shapes.last_mut().unwrap() {
                 points.push(end);
             }
         }
@@ -305,21 +424,21 @@ impl Shape {
                     shape.translate(delta);
                 }
             }
-            Shape::Circle { center, .. } => {
+            Shape::Circle(circle_shape) => {
-                *center += delta;
+                circle_shape.center += delta;
             }
             Shape::LineSegment { points, .. } => {
                 for p in points {
                     *p += delta;
                 }
             }
-            Shape::Path { points, .. } => {
+            Shape::Path(path_shape) => {
-                for p in points {
+                for p in &mut path_shape.points {
                     *p += delta;
                 }
             }
-            Shape::Rect { rect, .. } => {
+            Shape::Rect(rect_shape) => {
-                *rect = rect.translate(delta);
+                rect_shape.rect = rect_shape.rect.translate(delta);
             }
             Shape::Text(text_shape) => {
                 text_shape.pos += delta;

epaint/src/shape_transform.rs

@@ -9,20 +9,20 @@ pub fn adjust_colors(shape: &mut Shape, adjust_color: &impl Fn(&mut Color32)) {
                 adjust_colors(shape, adjust_color)
             }
         }
-        Shape::Circle { fill, stroke, .. } => {
+        Shape::Circle(circle_shape) => {
-            adjust_color(fill);
+            adjust_color(&mut circle_shape.fill);
-            adjust_color(&mut stroke.color);
+            adjust_color(&mut circle_shape.stroke.color);
         }
         Shape::LineSegment { stroke, .. } => {
             adjust_color(&mut stroke.color);
         }
-        Shape::Path { fill, stroke, .. } => {
+        Shape::Path(path_shape) => {
-            adjust_color(fill);
+            adjust_color(&mut path_shape.fill);
-            adjust_color(&mut stroke.color);
+            adjust_color(&mut path_shape.stroke.color);
         }
-        Shape::Rect { fill, stroke, .. } => {
+        Shape::Rect(rect_shape) => {
-            adjust_color(fill);
+            adjust_color(&mut rect_shape.fill);
-            adjust_color(&mut stroke.color);
+            adjust_color(&mut rect_shape.stroke.color);
         }
         Shape::Text(text_shape) => {
             if let Some(override_text_color) = &mut text_shape.override_text_color {

epaint/src/stats.rs

@@ -163,6 +163,9 @@ pub struct PaintStats {
     pub shape_mesh: AllocInfo,
     pub shape_vec: AllocInfo,
 
+    pub text_shape_vertices: AllocInfo,
+    pub text_shape_indices: AllocInfo,
+
     /// Number of separate clip rectangles
     pub clipped_meshes: AllocInfo,
     pub vertices: AllocInfo,
@@ -195,11 +198,16 @@ impl PaintStats {
             Shape::Noop | Shape::Circle { .. } | Shape::LineSegment { .. } | Shape::Rect { .. } => {
                 Default::default()
             }
-            Shape::Path { points, .. } => {
+            Shape::Path(path_shape) => {
-                self.shape_path += AllocInfo::from_slice(points);
+                self.shape_path += AllocInfo::from_slice(&path_shape.points);
             }
             Shape::Text(text_shape) => {
                 self.shape_text += AllocInfo::from_galley(&text_shape.galley);
+
+                for row in &text_shape.galley.rows {
+                    self.text_shape_indices += AllocInfo::from_slice(&row.visuals.mesh.indices);
+                    self.text_shape_vertices += AllocInfo::from_slice(&row.visuals.mesh.vertices);
+                }
             }
             Shape::Mesh(mesh) => {
                 self.shape_mesh += AllocInfo::from_mesh(mesh);

epaint/src/stroke.rs

@@ -26,6 +26,12 @@ impl Stroke {
             color: color.into(),
         }
     }
+
+    /// True if width is zero or color is transparent
+    #[inline]
+    pub fn is_empty(&self) -> bool {
+        self.width <= 0.0 || self.color == Color32::TRANSPARENT
+    }
 }
 
 impl<Color> From<(f32, Color)> for Stroke

epaint/src/tessellator.rs

@@ -541,12 +541,12 @@ impl Tessellator {
                     self.tessellate_shape(tex_size, shape, out)
                 }
             }
-            Shape::Circle {
+            Shape::Circle(CircleShape {
                 center,
                 radius,
                 fill,
                 stroke,
-            } => {
+            }) => {
                 if radius <= 0.0 {
                     return;
                 }
@@ -563,24 +563,71 @@ impl Tessellator {
                 self.scratchpad_path.stroke_closed(stroke, options, out);
             }
             Shape::Mesh(mesh) => {
-                if mesh.is_valid() {
+                if !mesh.is_valid() {
-                    out.append(mesh);
-                } else {
                     crate::epaint_assert!(false, "Invalid Mesh in Shape::Mesh");
+                    return;
                 }
+
+                if options.coarse_tessellation_culling && !clip_rect.intersects(mesh.calc_bounds())
+                {
+                    return;
+                }
+
+                out.append(mesh);
             }
             Shape::LineSegment { points, stroke } => {
+                if stroke.is_empty() {
+                    return;
+                }
+
+                if options.coarse_tessellation_culling
+                    && !clip_rect
+                        .intersects(Rect::from_two_pos(points[0], points[1]).expand(stroke.width))
+                {
+                    return;
+                }
+
                 self.scratchpad_path.clear();
                 self.scratchpad_path.add_line_segment(points);
                 self.scratchpad_path.stroke_open(stroke, options, out);
             }
-            Shape::Path {
+            Shape::Path(path_shape) => {
+                self.tessellate_path(path_shape, out);
+            }
+            Shape::Rect(rect_shape) => {
+                self.tessellate_rect(&rect_shape, out);
+            }
+            Shape::Text(text_shape) => {
+                if options.debug_paint_text_rects {
+                    let rect = text_shape.galley.rect.translate(text_shape.pos.to_vec2());
+                    self.tessellate_rect(
+                        &RectShape::stroke(rect.expand(0.5), 2.0, (0.5, Color32::GREEN)),
+                        out,
+                    );
+                }
+                self.tessellate_text(tex_size, text_shape, out);
+            }
+        }
+    }
+
+    pub(crate) fn tessellate_path(&mut self, path_shape: PathShape, out: &mut Mesh) {
+        if path_shape.points.len() < 2 {
+            return;
+        }
+
+        if self.options.coarse_tessellation_culling
+            && !path_shape.bounding_rect().intersects(self.clip_rect)
+        {
+            return;
+        }
+
+        let PathShape {
             points,
             closed,
             fill,
             stroke,
-            } => {
+        } = path_shape;
-                if points.len() >= 2 {
+
         self.scratchpad_path.clear();
         if closed {
             self.scratchpad_path.add_line_loop(&points);
@@ -593,50 +640,18 @@ impl Tessellator {
                 closed,
                 "You asked to fill a path that is not closed. That makes no sense."
             );
-                        self.scratchpad_path.fill(fill, options, out);
+            self.scratchpad_path.fill(fill, self.options, out);
         }
         let typ = if closed {
             PathType::Closed
         } else {
             PathType::Open
         };
-                    self.scratchpad_path.stroke(typ, stroke, options, out);
+        self.scratchpad_path.stroke(typ, stroke, self.options, out);
-                }
-            }
-            Shape::Rect {
-                rect,
-                corner_radius,
-                fill,
-                stroke,
-            } => {
-                let rect = PaintRect {
-                    rect,
-                    corner_radius,
-                    fill,
-                    stroke,
-                };
-                self.tessellate_rect(&rect, out);
-            }
-            Shape::Text(text_shape) => {
-                if options.debug_paint_text_rects {
-                    self.tessellate_rect(
-                        &PaintRect {
-                            rect: Rect::from_min_size(text_shape.pos, text_shape.galley.size())
-                                .expand(0.5),
-                            corner_radius: 2.0,
-                            fill: Default::default(),
-                            stroke: (0.5, Color32::GREEN).into(),
-                        },
-                        out,
-                    );
-                }
-                self.tessellate_text(tex_size, text_shape, out);
-            }
-        }
     }
 
-    pub(crate) fn tessellate_rect(&mut self, rect: &PaintRect, out: &mut Mesh) {
+    pub(crate) fn tessellate_rect(&mut self, rect: &RectShape, out: &mut Mesh) {
-        let PaintRect {
+        let RectShape {
             mut rect,
             corner_radius,
             fill,
@@ -803,12 +818,11 @@ pub fn tessellate_shapes(
             tessellator.clip_rect = Rect::EVERYTHING;
             tessellator.tessellate_shape(
                 tex_size,
-                Shape::Rect {
+                Shape::rect_stroke(
-                    rect: *clip_rect,
+                    *clip_rect,
-                    corner_radius: 0.0,
+                    0.0,
-                    fill: Default::default(),
+                    Stroke::new(2.0, Color32::from_rgb(150, 255, 150)),
-                    stroke: Stroke::new(2.0, Color32::from_rgb(150, 255, 150)),
+                ),
-                },
                 mesh,
             )
         }

epaint/src/text/fonts.rs

@@ -118,7 +118,6 @@ pub struct FontDefinitions {
     ///
     /// `epaint` has built-in-default for these,
     /// but you can override them if you like.
-    #[cfg_attr(feature = "persistence", serde(skip))]
     pub font_data: BTreeMap<String, FontData>,
 
     /// Which fonts (names) to use for each [`FontFamily`].
@@ -219,7 +218,7 @@ pub struct Fonts {
 }
 
 impl Fonts {
-    pub fn from_definitions(pixels_per_point: f32, definitions: FontDefinitions) -> Self {
+    pub fn new(pixels_per_point: f32, definitions: FontDefinitions) -> Self {
         assert!(
             0.0 < pixels_per_point && pixels_per_point < 100.0,
             "pixels_per_point out of range: {}",
@@ -278,6 +277,11 @@ impl Fonts {
         }
     }
 
+    #[deprecated = "Renamed to Fonts::new"]
+    pub fn from_definitions(pixels_per_point: f32, definitions: FontDefinitions) -> Self {
+        Self::new(pixels_per_point, definitions)
+    }
+
     #[inline(always)]
     pub fn pixels_per_point(&self) -> f32 {
         self.pixels_per_point

epaint/src/text/text_layout.rs

@@ -333,11 +333,13 @@ fn galley_from_rows(fonts: &Fonts, job: Arc<LayoutJob>, mut rows: Vec<Row>) -> G
 
     let format_summary = format_summary(&job);
 
+    let mut mesh_bounds = Rect::NOTHING;
     let mut num_vertices = 0;
     let mut num_indices = 0;
 
     for row in &mut rows {
         row.visuals = tessellate_row(fonts, &job, &format_summary, row);
+        mesh_bounds = mesh_bounds.union(row.visuals.mesh_bounds);
         num_vertices += row.visuals.mesh.vertices.len();
         num_indices += row.visuals.mesh.indices.len();
     }
@@ -348,6 +350,7 @@ fn galley_from_rows(fonts: &Fonts, job: Arc<LayoutJob>, mut rows: Vec<Row>) -> G
         job,
         rows,
         rect,
+        mesh_bounds,
         num_vertices,
         num_indices,
     }

epaint/src/text/text_layout_types.rs

@@ -13,6 +13,7 @@ use emath::*;
 ///
 /// Pass this to [`Fonts::layout_job]` or [`crate::text::layout`].
 #[derive(Clone, Debug, PartialEq)]
+#[cfg_attr(feature = "persistence", derive(serde::Deserialize, serde::Serialize))]
 pub struct LayoutJob {
     /// The complete text of this job, referenced by `LayoutSection`.
     pub text: String, // TODO: Cow<'static, str>
@@ -136,6 +137,7 @@ impl std::hash::Hash for LayoutJob {
 // ----------------------------------------------------------------------------
 
 #[derive(Clone, Debug, PartialEq)]
+#[cfg_attr(feature = "persistence", derive(serde::Deserialize, serde::Serialize))]
 pub struct LayoutSection {
     /// Can be used for first row indentation.
     pub leading_space: f32,
@@ -161,6 +163,7 @@ impl std::hash::Hash for LayoutSection {
 // ----------------------------------------------------------------------------
 
 #[derive(Copy, Clone, Debug, Hash, PartialEq)]
+#[cfg_attr(feature = "persistence", derive(serde::Deserialize, serde::Serialize))]
 pub struct TextFormat {
     pub style: TextStyle,
     /// Text color
@@ -225,6 +228,10 @@ pub struct Galley {
     /// * [`Align::RIGHT`]: rect.right() == 0.0
     pub rect: Rect,
 
+    /// Tight bounding box around all the meshes in all the rows.
+    /// Can be used for culling.
+    pub mesh_bounds: Rect,
+
     /// Total number of vertices in all the row meshes.
     pub num_vertices: usize,