Implement explicit text caching in the widget state tree

tiny_skia/src/backend.rs

@@ -1,16 +1,12 @@
-use crate::core::text;
-use crate::core::Gradient;
-use crate::core::{Background, Color, Font, Point, Rectangle, Size, Vector};
+use crate::core::{Background, Color, Gradient, Rectangle, Vector};
 use crate::graphics::backend;
+use crate::graphics::text;
 use crate::graphics::{Damage, Viewport};
 use crate::primitive::{self, Primitive};
-use crate::Settings;
 
 use std::borrow::Cow;
 
 pub struct Backend {
-    default_font: Font,
-    default_text_size: f32,
     text_pipeline: crate::text::Pipeline,
 
     #[cfg(feature = "image")]
@@ -21,10 +17,8 @@ pub struct Backend {
 }
 
 impl Backend {
-    pub fn new(settings: Settings) -> Self {
+    pub fn new() -> Self {
         Self {
-            default_font: settings.default_font,
-            default_text_size: settings.default_text_size,
             text_pipeline: crate::text::Pipeline::new(),
 
             #[cfg(feature = "image")]
@@ -364,6 +358,32 @@ impl Backend {
                     }
                 }
             }
+            Primitive::Paragraph {
+                paragraph,
+                position,
+                color,
+            } => {
+                let physical_bounds =
+                    (Rectangle::new(*position, paragraph.min_bounds)
+                        + translation)
+                        * scale_factor;
+
+                if !clip_bounds.intersects(&physical_bounds) {
+                    return;
+                }
+
+                let clip_mask = (!physical_bounds.is_within(&clip_bounds))
+                    .then_some(clip_mask as &_);
+
+                self.text_pipeline.draw_paragraph(
+                    paragraph,
+                    *position + translation,
+                    *color,
+                    scale_factor,
+                    pixels,
+                    clip_mask,
+                );
+            }
             Primitive::Text {
                 content,
                 bounds,
@@ -599,6 +619,12 @@ impl Backend {
     }
 }
 
+impl Default for Backend {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 fn into_color(color: Color) -> tiny_skia::Color {
     tiny_skia::Color::from_rgba(color.b, color.g, color.r, color.a)
         .expect("Convert color from iced to tiny_skia")
@@ -779,58 +805,8 @@ impl iced_graphics::Backend for Backend {
 }
 
 impl backend::Text for Backend {
-    const ICON_FONT: Font = Font::with_name("Iced-Icons");
-    const CHECKMARK_ICON: char = '\u{f00c}';
-    const ARROW_DOWN_ICON: char = '\u{e800}';
-
-    fn default_font(&self) -> Font {
-        self.default_font
-    }
-
-    fn default_size(&self) -> f32 {
-        self.default_text_size
-    }
-
-    fn measure(
-        &self,
-        contents: &str,
-        size: f32,
-        line_height: text::LineHeight,
-        font: Font,
-        bounds: Size,
-        shaping: text::Shaping,
-    ) -> Size {
-        self.text_pipeline.measure(
-            contents,
-            size,
-            line_height,
-            font,
-            bounds,
-            shaping,
-        )
-    }
-
-    fn hit_test(
-        &self,
-        contents: &str,
-        size: f32,
-        line_height: text::LineHeight,
-        font: Font,
-        bounds: Size,
-        shaping: text::Shaping,
-        point: Point,
-        nearest_only: bool,
-    ) -> Option<text::Hit> {
-        self.text_pipeline.hit_test(
-            contents,
-            size,
-            line_height,
-            font,
-            bounds,
-            shaping,
-            point,
-            nearest_only,
-        )
+    fn font_system(&self) -> &text::FontSystem {
+        self.text_pipeline.font_system()
     }
 
     fn load_font(&mut self, font: Cow<'static, [u8]>) {
@@ -840,7 +816,10 @@ impl backend::Text for Backend {
 
 #[cfg(feature = "image")]
 impl backend::Image for Backend {
-    fn dimensions(&self, handle: &crate::core::image::Handle) -> Size<u32> {
+    fn dimensions(
+        &self,
+        handle: &crate::core::image::Handle,
+    ) -> crate::core::Size<u32> {
         self.raster_pipeline.dimensions(handle)
     }
 }
@@ -850,7 +829,7 @@ impl backend::Svg for Backend {
     fn viewport_dimensions(
         &self,
         handle: &crate::core::svg::Handle,
-    ) -> Size<u32> {
+    ) -> crate::core::Size<u32> {
         self.vector_pipeline.viewport_dimensions(handle)
     }
 }