Add Auto strategy to text::Shaping

Cargo.toml

@@ -69,6 +69,10 @@ advanced = ["iced_core/advanced", "iced_widget/advanced"]
 fira-sans = ["iced_renderer/fira-sans"]
 # Auto-detects light/dark mode for the built-in theme
 auto-detect-theme = ["iced_core/auto-detect-theme"]
+# Enables basic text shaping by default
+basic-shaping = ["iced_core/basic-shaping"]
+# Enables advanced text shaping by default
+advanced-shaping = ["iced_core/advanced-shaping"]
 # Enables strict assertions for debugging purposes at the expense of performance
 strict-assertions = ["iced_renderer/strict-assertions"]
 # Redraws on every runtime event, and not only when a widget requests it

core/Cargo.toml

@@ -17,6 +17,8 @@ workspace = true
 auto-detect-theme = ["dep:dark-light"]
 advanced = []
 crisp = []
+basic-shaping = []
+advanced-shaping = []
 
 [dependencies]
 bitflags.workspace = true

core/src/text.rs

@@ -130,8 +130,17 @@ impl From<Alignment> for alignment::Horizontal {
 }
 
 /// The shaping strategy of some text.
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Default)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub enum Shaping {
+    /// Auto-detect the best shaping strategy from the text.
+    ///
+    /// This strategy will use [`Basic`](Self::Basic) shaping if the
+    /// text consists of only ASCII characters; otherwise, it will
+    /// use [`Advanced`](Self::Advanced) shaping.
+    ///
+    /// This is the default, if neither the `basic-shaping` nor `advanced-shaping`
+    /// features are enabled.
+    Auto,
     /// No shaping and no font fallback.
     ///
     /// This shaping strategy is very cheap, but it will not display complex
@@ -140,8 +149,8 @@ pub enum Shaping {
     /// You should use this strategy when you have complete control of the text
     /// and the font you are displaying in your application.
     ///
-    /// This is the default.
-    #[default]
+    /// This will be the default if the `basic-shaping` feature is enabled and
+    /// the `advanced-shaping` feature is disabled.
     Basic,
     /// Advanced text shaping and font fallback.
     ///
@@ -150,9 +159,23 @@ pub enum Shaping {
     /// may be needed to display all of the glyphs.
     ///
     /// Advanced shaping is expensive! You should only enable it when necessary.
+    ///
+    /// This will be the default if the `advanced-shaping` feature is enabled.
     Advanced,
 }
 
+impl Default for Shaping {
+    fn default() -> Self {
+        if cfg!(feature = "advanced-shaping") {
+            Self::Advanced
+        } else if cfg!(feature = "basic-shaping") {
+            Self::Basic
+        } else {
+            Self::Auto
+        }
+    }
+}
+
 /// The wrapping strategy of some text.
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Default)]
 pub enum Wrapping {

examples/layout/src/main.rs

@@ -94,14 +94,14 @@ impl Layout {
 
         let controls = row([
             (!self.example.is_first()).then_some(
-                button(text("← Previous").shaping(text::Shaping::Advanced))
+                button(text("← Previous"))
                     .padding([5, 10])
                     .on_press(Message::Previous)
                     .into(),
             ),
             Some(horizontal_space().into()),
             (!self.example.is_last()).then_some(
-                button(text("Next →").shaping(text::Shaping::Advanced))
+                button(text("Next →"))
                     .padding([5, 10])
                     .on_press(Message::Next)
                     .into(),
@@ -313,7 +313,7 @@ fn quotes<'a>() -> Element<'a, Message> {
             "This is another reply",
         ),
         horizontal_rule(1),
-        text("A separator ↑").shaping(text::Shaping::Advanced),
+        text("A separator ↑"),
     ]
     .width(Shrink)
     .spacing(10)

examples/styling/snapshots/catppuccin_frappé-tiny-skia.sha256

@@ -1 +1 @@
-0650eb2c27c21c5d48e1e00031a52d8471d8a3b4e827ad502c4628914f5c1c13
+129523830df064908cfa911214ba61dadc31d8975425ba3efaae69da9514a3d0

graphics/src/text.rs

@@ -323,8 +323,15 @@ fn to_align(alignment: Alignment) -> Option<cosmic_text::Align> {
 }
 
 /// Converts some [`Shaping`] strategy to a [`cosmic_text::Shaping`] strategy.
-pub fn to_shaping(shaping: Shaping) -> cosmic_text::Shaping {
+pub fn to_shaping(shaping: Shaping, text: &str) -> cosmic_text::Shaping {
     match shaping {
+        Shaping::Auto => {
+            if text.is_ascii() {
+                cosmic_text::Shaping::Basic
+            } else {
+                cosmic_text::Shaping::Advanced
+            }
+        }
         Shaping::Basic => cosmic_text::Shaping::Basic,
         Shaping::Advanced => cosmic_text::Shaping::Advanced,
     }

graphics/src/text/cache.rs

@@ -55,7 +55,7 @@ impl Cache {
                 font_system,
                 key.content,
                 &text::to_attributes(key.font),
-                text::to_shaping(key.shaping),
+                text::to_shaping(key.shaping, key.content),
             );
 
             let bounds = text::align(&mut buffer, font_system, key.align_x);

graphics/src/text/paragraph.rs

@@ -88,7 +88,7 @@ impl core::text::Paragraph for Paragraph {
             font_system.raw(),
             text.content,
             &text::to_attributes(text.font),
-            text::to_shaping(text.shaping),
+            text::to_shaping(text.shaping, text.content),
         );
 
         let min_bounds =
@@ -158,7 +158,7 @@ impl core::text::Paragraph for Paragraph {
                 (span.text.as_ref(), attrs.metadata(i))
             }),
             &text::to_attributes(text.font),
-            text::to_shaping(text.shaping),
+            cosmic_text::Shaping::Advanced,
             None,
         );