Make basic text shaping the default shaping strategy

graphics/src/backend.rs

@@ -48,6 +48,7 @@ pub trait Text {
         size: f32,
         font: Font,
         bounds: Size,
+        advanced_shape: bool,
     ) -> (f32, f32);
 
     /// Tests whether the provided point is within the boundaries of [`Text`]
@@ -65,6 +66,7 @@ pub trait Text {
         bounds: Size,
         point: Point,
         nearest_only: bool,
+        advanced_shape: bool,
     ) -> Option<text::Hit>;
 
     /// Loads a [`Font`] from its bytes.

graphics/src/geometry/text.rs

@@ -25,6 +25,15 @@ pub struct Text {
     pub horizontal_alignment: alignment::Horizontal,
     /// The vertical alignment of the text
     pub vertical_alignment: alignment::Vertical,
+    /// Whether the text needs advanced shaping and font fallback.
+    ///
+    /// You will need to enable this flag if the text contains a complex
+    /// script, the font used needs it, and/or multiple fonts in your system
+    /// may be needed to display all of the glyphs.
+    ///
+    /// Advanced shaping is expensive! You should only enable it when
+    /// necessary.
+    pub advanced_shape: bool,
 }
 
 impl Default for Text {
@@ -37,6 +46,7 @@ impl Default for Text {
             font: Font::default(),
             horizontal_alignment: alignment::Horizontal::Left,
             vertical_alignment: alignment::Vertical::Top,
+            advanced_shape: false,
         }
     }
 }

graphics/src/primitive.rs

@@ -26,6 +26,15 @@ pub enum Primitive {
         horizontal_alignment: alignment::Horizontal,
         /// The vertical alignment of the text
         vertical_alignment: alignment::Vertical,
+        /// Whether the text needs advanced shaping and font fallback.
+        ///
+        /// You will need to enable this flag if the text contains a complex
+        /// script, the font used needs it, and/or multiple fonts in your system
+        /// may be needed to display all of the glyphs.
+        ///
+        /// Advanced shaping is expensive! You should only enable it when
+        /// necessary.
+        advanced_shape: bool,
     },
     /// A quad primitive
     Quad {

graphics/src/renderer.rs

@@ -138,8 +138,10 @@ where
         size: f32,
         font: Font,
         bounds: Size,
+        needs_shaping: bool,
     ) -> (f32, f32) {
-        self.backend().measure(content, size, font, bounds)
+        self.backend()
+            .measure(content, size, font, bounds, needs_shaping)
     }
 
     fn hit_test(
@@ -150,6 +152,7 @@ where
         bounds: Size,
         point: Point,
         nearest_only: bool,
+        advanced_shape: bool,
     ) -> Option<text::Hit> {
         self.backend().hit_test(
             content,
@@ -158,6 +161,7 @@ where
             bounds,
             point,
             nearest_only,
+            advanced_shape,
         )
     }
 
@@ -174,6 +178,7 @@ where
             font: text.font,
             horizontal_alignment: text.horizontal_alignment,
             vertical_alignment: text.vertical_alignment,
+            advanced_shape: text.advanced_shape,
         });
     }
 }