Introduce custom backend-specific primitives

renderer/src/lib.rs

@@ -3,17 +3,259 @@ pub mod compositor;
 #[cfg(feature = "geometry")]
 pub mod geometry;
 
-mod backend;
 mod settings;
 
 pub use iced_graphics as graphics;
 pub use iced_graphics::core;
 
-pub use backend::Backend;
 pub use compositor::Compositor;
 pub use settings::Settings;
 
+#[cfg(feature = "geometry")]
+pub use geometry::Geometry;
+
+use crate::core::renderer;
+use crate::core::text::{self, Text};
+use crate::core::{Background, Font, Point, Rectangle, Size, Vector};
+
+use std::borrow::Cow;
+
 /// The default graphics renderer for [`iced`].
 ///
 /// [`iced`]: https://github.com/iced-rs/iced
-pub type Renderer<Theme> = iced_graphics::Renderer<Backend, Theme>;
+pub enum Renderer<Theme> {
+    TinySkia(iced_tiny_skia::Renderer<Theme>),
+    #[cfg(feature = "wgpu")]
+    Wgpu(iced_wgpu::Renderer<Theme>),
+}
+
+macro_rules! delegate {
+    ($renderer:expr, $name:ident, $body:expr) => {
+        match $renderer {
+            Self::TinySkia($name) => $body,
+            #[cfg(feature = "wgpu")]
+            Self::Wgpu($name) => $body,
+        }
+    };
+}
+
+impl<T> Renderer<T> {
+    #[cfg(feature = "wgpu")]
+    pub fn draw_with_wgpu(&mut self, primitive: iced_wgpu::Primitive) {
+        if let Self::Wgpu(renderer) = self {
+            renderer.draw_primitive(primitive);
+        }
+    }
+}
+
+impl<T> core::Renderer for Renderer<T> {
+    type Theme = T;
+
+    fn with_layer(&mut self, bounds: Rectangle, f: impl FnOnce(&mut Self)) {
+        match self {
+            Self::TinySkia(renderer) => {
+                let primitives = renderer.start_layer();
+
+                f(self);
+
+                match self {
+                    Self::TinySkia(renderer) => {
+                        renderer.end_layer(primitives, bounds);
+                    }
+                    #[cfg(feature = "wgpu")]
+                    _ => unreachable!(),
+                }
+            }
+            #[cfg(feature = "wgpu")]
+            Self::Wgpu(renderer) => {
+                let primitives = renderer.start_layer();
+
+                f(self);
+
+                match self {
+                    #[cfg(feature = "wgpu")]
+                    Self::Wgpu(renderer) => {
+                        renderer.end_layer(primitives, bounds);
+                    }
+                    _ => unreachable!(),
+                }
+            }
+        }
+    }
+
+    fn with_translation(
+        &mut self,
+        translation: Vector,
+        f: impl FnOnce(&mut Self),
+    ) {
+        match self {
+            Self::TinySkia(renderer) => {
+                let primitives = renderer.start_translation();
+
+                f(self);
+
+                match self {
+                    Self::TinySkia(renderer) => {
+                        renderer.end_translation(primitives, translation);
+                    }
+                    #[cfg(feature = "wgpu")]
+                    _ => unreachable!(),
+                }
+            }
+            #[cfg(feature = "wgpu")]
+            Self::Wgpu(renderer) => {
+                let primitives = renderer.start_translation();
+
+                f(self);
+
+                match self {
+                    #[cfg(feature = "wgpu")]
+                    Self::Wgpu(renderer) => {
+                        renderer.end_translation(primitives, translation);
+                    }
+                    _ => unreachable!(),
+                }
+            }
+        }
+    }
+
+    fn fill_quad(
+        &mut self,
+        quad: renderer::Quad,
+        background: impl Into<Background>,
+    ) {
+        delegate!(self, renderer, renderer.fill_quad(quad, background));
+    }
+
+    fn clear(&mut self) {
+        delegate!(self, renderer, renderer.clear());
+    }
+}
+
+impl<T> text::Renderer for Renderer<T> {
+    type Font = Font;
+
+    const ICON_FONT: Font = iced_tiny_skia::Renderer::<T>::ICON_FONT;
+    const CHECKMARK_ICON: char = iced_tiny_skia::Renderer::<T>::CHECKMARK_ICON;
+    const ARROW_DOWN_ICON: char =
+        iced_tiny_skia::Renderer::<T>::ARROW_DOWN_ICON;
+
+    fn default_font(&self) -> Self::Font {
+        delegate!(self, renderer, renderer.default_font())
+    }
+
+    fn default_size(&self) -> f32 {
+        delegate!(self, renderer, renderer.default_size())
+    }
+
+    fn measure(
+        &self,
+        content: &str,
+        size: f32,
+        line_height: text::LineHeight,
+        font: Font,
+        bounds: Size,
+        shaping: text::Shaping,
+    ) -> Size {
+        delegate!(
+            self,
+            renderer,
+            renderer.measure(content, size, line_height, font, bounds, shaping)
+        )
+    }
+
+    fn hit_test(
+        &self,
+        content: &str,
+        size: f32,
+        line_height: text::LineHeight,
+        font: Font,
+        bounds: Size,
+        shaping: text::Shaping,
+        point: Point,
+        nearest_only: bool,
+    ) -> Option<text::Hit> {
+        delegate!(
+            self,
+            renderer,
+            renderer.hit_test(
+                content,
+                size,
+                line_height,
+                font,
+                bounds,
+                shaping,
+                point,
+                nearest_only
+            )
+        )
+    }
+
+    fn load_font(&mut self, bytes: Cow<'static, [u8]>) {
+        delegate!(self, renderer, renderer.load_font(bytes));
+    }
+
+    fn fill_text(&mut self, text: Text<'_, Self::Font>) {
+        delegate!(self, renderer, renderer.fill_text(text));
+    }
+}
+
+#[cfg(feature = "image")]
+impl<T> crate::core::image::Renderer for Renderer<T> {
+    type Handle = crate::core::image::Handle;
+
+    fn dimensions(&self, handle: &crate::core::image::Handle) -> Size<u32> {
+        delegate!(self, renderer, renderer.dimensions(handle))
+    }
+
+    fn draw(&mut self, handle: crate::core::image::Handle, bounds: Rectangle) {
+        delegate!(self, renderer, renderer.draw(handle, bounds));
+    }
+}
+
+#[cfg(feature = "svg")]
+impl<T> crate::core::svg::Renderer for Renderer<T> {
+    fn dimensions(&self, handle: &crate::core::svg::Handle) -> Size<u32> {
+        delegate!(self, renderer, renderer.dimensions(handle))
+    }
+
+    fn draw(
+        &mut self,
+        handle: crate::core::svg::Handle,
+        color: Option<crate::core::Color>,
+        bounds: Rectangle,
+    ) {
+        delegate!(self, renderer, renderer.draw(handle, color, bounds))
+    }
+}
+
+#[cfg(feature = "geometry")]
+impl<T> crate::graphics::geometry::Renderer for Renderer<T> {
+    type Geometry = crate::Geometry;
+
+    fn draw(&mut self, layers: Vec<Self::Geometry>) {
+        match self {
+            Self::TinySkia(renderer) => {
+                for layer in layers {
+                    match layer {
+                        crate::Geometry::TinySkia(primitive) => {
+                            renderer.draw_primitive(primitive);
+                        }
+                        _ => unreachable!(),
+                    }
+                }
+            }
+            #[cfg(feature = "wgpu")]
+            Self::Wgpu(renderer) => {
+                for layer in layers {
+                    match layer {
+                        crate::Geometry::Wgpu(primitive) => {
+                            renderer.draw_primitive(primitive);
+                        }
+                        _ => unreachable!(),
+                    }
+                }
+            }
+        }
+    }
+}