Draft support for dynamic custom renderer injection

5 files changed, 289 insertions, 16 deletions

diff --git a/renderer/src/compositor.rs b/renderer/src/compositor.rs
index c23a814c..058fa36d 100644
--- a/renderer/src/compositor.rs
+++ b/renderer/src/compositor.rs
@@ -1,4 +1,5 @@
 use crate::core::Color;
+use crate::custom;
 use crate::graphics::compositor::{Information, SurfaceError, Window};
 use crate::graphics::{Error, Viewport};
 use crate::{Renderer, Settings};
@@ -10,12 +11,14 @@ pub enum Compositor {
     TinySkia(iced_tiny_skia::window::Compositor),
     #[cfg(feature = "wgpu")]
     Wgpu(iced_wgpu::window::Compositor),
+    Custom(Box<dyn custom::Compositor>),
 }
 
 pub enum Surface {
     TinySkia(iced_tiny_skia::window::Surface),
     #[cfg(feature = "wgpu")]
     Wgpu(iced_wgpu::window::Surface<'static>),
+    Custom(Box<dyn custom::Surface>),
 }
 
 impl crate::graphics::Compositor for Compositor {
@@ -56,6 +59,9 @@ impl crate::graphics::Compositor for Compositor {
             Compositor::Wgpu(compositor) => {
                 Renderer::Wgpu(compositor.create_renderer())
             }
+            Compositor::Custom(compositor) => {
+                Renderer::Custom(compositor.create_renderer())
+            }
         }
     }
 
@@ -73,6 +79,9 @@ impl crate::graphics::Compositor for Compositor {
             Self::Wgpu(compositor) => {
                 Surface::Wgpu(compositor.create_surface(window, width, height))
             }
+            Self::Custom(compositor) => Surface::Custom(
+                compositor.create_surface(Box::new(window), width, height),
+            ),
         }
     }
 
@@ -90,6 +99,9 @@ impl crate::graphics::Compositor for Compositor {
             (Self::Wgpu(compositor), Surface::Wgpu(surface)) => {
                 compositor.configure_surface(surface, width, height);
             }
+            (Self::Custom(compositor), Surface::Custom(surface)) => {
+                compositor.configure_surface(surface, width, height);
+            }
             #[allow(unreachable_patterns)]
             _ => panic!(
                 "The provided surface is not compatible with the compositor."
@@ -102,6 +114,7 @@ impl crate::graphics::Compositor for Compositor {
             Self::TinySkia(compositor) => compositor.fetch_information(),
             #[cfg(feature = "wgpu")]
             Self::Wgpu(compositor) => compositor.fetch_information(),
+            Self::Custom(compositor) => compositor.fetch_information(),
         }
     }
 
@@ -144,6 +157,18 @@ impl crate::graphics::Compositor for Compositor {
                     overlay,
                 )
             }),
+
+            #[cfg(feature = "wgpu")]
+            (
+                Self::Custom(compositor),
+                crate::Renderer::Custom(renderer),
+                Surface::Custom(surface),
+            ) => renderer.present(
+                surface.as_mut(),
+                viewport,
+                background_color,
+                compositor.as_mut(),
+            ),
             #[allow(unreachable_patterns)]
             _ => panic!(
                 "The provided renderer or surface are not compatible \
diff --git a/renderer/src/custom.rs b/renderer/src/custom.rs
new file mode 100644
index 00000000..680aa0b5
--- /dev/null
+++ b/renderer/src/custom.rs
@@ -0,0 +1,164 @@
+use crate::core::image;
+use crate::core::renderer;
+use crate::core::svg;
+use crate::core::text::Text;
+use crate::core::{
+    Background, Color, Font, Pixels, Point, Rectangle, Size, Transformation,
+};
+use crate::graphics::compositor;
+use crate::graphics::text::{Editor, Paragraph};
+use crate::graphics::{Mesh, Viewport};
+
+#[cfg(feature = "geometry")]
+use crate::graphics::geometry::{self, Fill, Path, Stroke};
+
+use std::borrow::Cow;
+
+pub trait Renderer {
+    fn draw_mesh(&mut self, mesh: Mesh);
+
+    fn start_layer(&mut self);
+
+    fn end_layer(&mut self, bounds: Rectangle);
+
+    fn start_transformation(&mut self);
+
+    fn end_transformation(&mut self, transformation: Transformation);
+
+    fn fill_quad(&mut self, quad: renderer::Quad, background: Background);
+
+    fn clear(&mut self);
+
+    fn default_font(&self) -> Font;
+
+    fn default_size(&self) -> Pixels;
+
+    fn load_font(&mut self, bytes: Cow<'static, [u8]>);
+
+    fn fill_paragraph(
+        &mut self,
+        paragraph: &Paragraph,
+        position: Point,
+        color: Color,
+        clip_bounds: Rectangle,
+    );
+
+    fn fill_editor(
+        &mut self,
+        editor: &Editor,
+        position: Point,
+        color: Color,
+        clip_bounds: Rectangle,
+    );
+
+    fn fill_text(
+        &mut self,
+        text: Text<'_, Font>,
+        position: Point,
+        color: Color,
+        clip_bounds: Rectangle,
+    );
+
+    fn measure_image(&self, handle: &image::Handle) -> Size<u32>;
+
+    fn draw_image(
+        &mut self,
+        handle: image::Handle,
+        filter_method: image::FilterMethod,
+        bounds: Rectangle,
+    );
+
+    fn measure_svg(&self, handle: &svg::Handle) -> Size<u32>;
+
+    fn draw_svg(
+        &mut self,
+        handle: crate::core::svg::Handle,
+        color: Option<crate::core::Color>,
+        bounds: Rectangle,
+    );
+
+    #[cfg(feature = "geometry")]
+    fn new_frame(&self, size: Size) -> Box<dyn Frame>;
+
+    #[cfg(feature = "geometry")]
+    fn draw_geometry(&mut self, geometry: Box<dyn Geometry>);
+
+    fn present(
+        &mut self,
+        surface: &mut dyn Surface,
+        viewport: &Viewport,
+        background_color: Color,
+        compositor: &mut dyn Compositor,
+    ) -> Result<(), compositor::SurfaceError>;
+}
+
+#[cfg(feature = "geometry")]
+pub trait Frame: std::any::Any {
+    fn new(&self, size: Size) -> Box<dyn Frame>;
+
+    fn width(&self) -> f32;
+
+    fn height(&self) -> f32;
+
+    fn size(&self) -> Size;
+
+    fn center(&self) -> Point;
+
+    fn fill(&mut self, path: &Path, fill: Fill);
+
+    fn fill_rectangle(&mut self, top_left: Point, size: Size, fill: Fill);
+
+    fn stroke<'a>(&mut self, path: &Path, stroke: Stroke<'a>);
+
+    fn fill_text(&mut self, text: geometry::Text);
+
+    fn translate(&mut self, translation: crate::core::Vector);
+
+    fn rotate(&mut self, angle: crate::core::Radians);
+
+    fn scale(&mut self, scale: f32);
+
+    fn scale_nonuniform(&mut self, scale: crate::core::Vector);
+
+    fn push_transform(&mut self);
+
+    fn pop_transform(&mut self);
+
+    fn clip(&mut self, frame: Box<dyn Frame>, origin: Point);
+
+    fn into_geometry(self: Box<Self>) -> Box<dyn Geometry>;
+}
+
+#[cfg(feature = "geometry")]
+pub trait Geometry: std::any::Any + std::fmt::Debug {
+    fn transform(
+        self: Box<Self>,
+        transformation: Transformation,
+    ) -> Box<dyn Geometry>;
+
+    fn cache(self: Box<Self>) -> std::sync::Arc<dyn Geometry>;
+
+    fn load(self: std::sync::Arc<Self>) -> Box<dyn Geometry>;
+}
+
+pub trait Compositor: std::any::Any {
+    fn create_renderer(&self) -> Box<dyn Renderer>;
+
+    fn create_surface(
+        &mut self,
+        window: Box<dyn compositor::Window>,
+        width: u32,
+        height: u32,
+    ) -> Box<dyn Surface>;
+
+    fn configure_surface(
+        &mut self,
+        surface: &mut Box<dyn Surface>,
+        width: u32,
+        height: u32,
+    );
+
+    fn fetch_information(&self) -> compositor::Information;
+}
+
+pub trait Surface: std::any::Any {}
diff --git a/renderer/src/geometry.rs b/renderer/src/geometry.rs
index 36435148..bf70c7fa 100644
--- a/renderer/src/geometry.rs
+++ b/renderer/src/geometry.rs
@@ -3,6 +3,7 @@ mod cache;
 pub use cache::Cache;
 
 use crate::core::{Point, Radians, Rectangle, Size, Transformation, Vector};
+use crate::custom;
 use crate::graphics::geometry::{Fill, Path, Stroke, Text};
 use crate::Renderer;
 
@@ -12,6 +13,7 @@ macro_rules! delegate {
             Self::TinySkia($name) => $body,
             #[cfg(feature = "wgpu")]
             Self::Wgpu($name) => $body,
+            Self::Custom($name) => $body,
         }
     };
 }
@@ -20,6 +22,7 @@ pub enum Geometry {
     TinySkia(iced_tiny_skia::Primitive),
     #[cfg(feature = "wgpu")]
     Wgpu(iced_wgpu::Primitive),
+    Custom(Box<dyn custom::Geometry>),
 }
 
 impl Geometry {
@@ -32,6 +35,9 @@ impl Geometry {
             Self::Wgpu(primitive) => {
                 Self::Wgpu(primitive.transform(transformation))
             }
+            Self::Custom(geometry) => {
+                Self::Custom(geometry.transform(transformation))
+            }
         }
     }
 }
@@ -40,6 +46,7 @@ pub enum Frame {
     TinySkia(iced_tiny_skia::geometry::Frame),
     #[cfg(feature = "wgpu")]
     Wgpu(iced_wgpu::geometry::Frame),
+    Custom(Box<dyn custom::Frame>),
 }
 
 impl Frame {
@@ -52,6 +59,9 @@ impl Frame {
             Renderer::Wgpu(_) => {
                 Frame::Wgpu(iced_wgpu::geometry::Frame::new(size))
             }
+            Renderer::Custom(renderer) => {
+                Frame::Custom(renderer.new_frame(size))
+            }
         }
     }
 
@@ -82,7 +92,7 @@ impl Frame {
     /// Draws the given [`Path`] on the [`Frame`] by filling it with the
     /// provided style.
     pub fn fill(&mut self, path: &Path, fill: impl Into<Fill>) {
-        delegate!(self, frame, frame.fill(path, fill));
+        delegate!(self, frame, frame.fill(path, fill.into()));
     }
 
     /// Draws an axis-aligned rectangle given its top-left corner coordinate and
@@ -93,13 +103,17 @@ impl Frame {
         size: Size,
         fill: impl Into<Fill>,
     ) {
-        delegate!(self, frame, frame.fill_rectangle(top_left, size, fill));
+        delegate!(
+            self,
+            frame,
+            frame.fill_rectangle(top_left, size, fill.into())
+        );
     }
 
     /// Draws the stroke of the given [`Path`] on the [`Frame`] with the
     /// provided style.
     pub fn stroke<'a>(&mut self, path: &Path, stroke: impl Into<Stroke<'a>>) {
-        delegate!(self, frame, frame.stroke(path, stroke));
+        delegate!(self, frame, frame.stroke(path, stroke.into()));
     }
 
     /// Draws the characters of the given [`Text`] on the [`Frame`], filling
@@ -116,7 +130,7 @@ impl Frame {
     /// Support for vectorial text is planned, and should address all these
     /// limitations.
     pub fn fill_text(&mut self, text: impl Into<Text>) {
-        delegate!(self, frame, frame.fill_text(text));
+        delegate!(self, frame, frame.fill_text(text.into()));
     }
 
     /// Stores the current transform of the [`Frame`] and executes the given
@@ -155,6 +169,7 @@ impl Frame {
             Self::Wgpu(_) => {
                 Self::Wgpu(iced_wgpu::geometry::Frame::new(region.size()))
             }
+            Self::Custom(frame) => Self::Custom(frame.new(region.size())),
         };
 
         let result = f(&mut frame);
@@ -169,6 +184,9 @@ impl Frame {
             (Self::Wgpu(target), Self::Wgpu(frame)) => {
                 target.clip(frame, origin);
             }
+            (Self::Custom(target), Self::Custom(frame)) => {
+                target.clip(frame, origin);
+            }
             #[allow(unreachable_patterns)]
             _ => unreachable!(),
         };
@@ -185,19 +203,19 @@ impl Frame {
     /// Applies a rotation in radians to the current transform of the [`Frame`].
     #[inline]
     pub fn rotate(&mut self, angle: impl Into<Radians>) {
-        delegate!(self, frame, frame.rotate(angle));
+        delegate!(self, frame, frame.rotate(angle.into()));
     }
 
     /// Applies a uniform scaling to the current transform of the [`Frame`].
     #[inline]
     pub fn scale(&mut self, scale: impl Into<f32>) {
-        delegate!(self, frame, frame.scale(scale));
+        delegate!(self, frame, frame.scale(scale.into()));
     }
 
     /// Applies a non-uniform scaling to the current transform of the [`Frame`].
     #[inline]
     pub fn scale_nonuniform(&mut self, scale: impl Into<Vector>) {
-        delegate!(self, frame, frame.scale_nonuniform(scale));
+        delegate!(self, frame, frame.scale_nonuniform(scale.into()));
     }
 
     pub fn into_geometry(self) -> Geometry {
@@ -205,6 +223,7 @@ impl Frame {
             Self::TinySkia(frame) => Geometry::TinySkia(frame.into_primitive()),
             #[cfg(feature = "wgpu")]
             Self::Wgpu(frame) => Geometry::Wgpu(frame.into_primitive()),
+            Self::Custom(frame) => Geometry::Custom(frame.into_geometry()),
         }
     }
 }
diff --git a/renderer/src/geometry/cache.rs b/renderer/src/geometry/cache.rs
index 3aff76b9..6a43ddb6 100644
--- a/renderer/src/geometry/cache.rs
+++ b/renderer/src/geometry/cache.rs
@@ -1,4 +1,5 @@
 use crate::core::Size;
+use crate::custom;
 use crate::geometry::{Frame, Geometry};
 use crate::Renderer;
 
@@ -29,6 +30,7 @@ enum Internal {
     TinySkia(Arc<iced_tiny_skia::Primitive>),
     #[cfg(feature = "wgpu")]
     Wgpu(Arc<iced_wgpu::Primitive>),
+    Custom(Arc<dyn custom::Geometry>),
 }
 
 impl Cache {
@@ -82,6 +84,9 @@ impl Cache {
                             content: primitive.clone(),
                         });
                     }
+                    Internal::Custom(geometry) => {
+                        return Geometry::Custom(geometry.clone().load())
+                    }
                 }
             }
         }
@@ -100,6 +105,9 @@ impl Cache {
                 Geometry::Wgpu(primitive) => {
                     Internal::Wgpu(Arc::new(primitive))
                 }
+                Geometry::Custom(geometry) => {
+                    Internal::Custom(geometry.cache())
+                }
             }
         };
 
@@ -120,6 +128,7 @@ impl Cache {
                     content: primitive,
                 })
             }
+            Internal::Custom(geometry) => Geometry::Custom(geometry.load()),
         }
     }
 }
diff --git a/renderer/src/lib.rs b/renderer/src/lib.rs
index 757c264d..70741356 100644
--- a/renderer/src/lib.rs
+++ b/renderer/src/lib.rs
@@ -5,6 +5,7 @@
 pub use iced_wgpu as wgpu;
 
 pub mod compositor;
+pub mod custom;
 
 #[cfg(feature = "geometry")]
 pub mod geometry;
@@ -38,6 +39,7 @@ pub enum Renderer {
     TinySkia(iced_tiny_skia::Renderer),
     #[cfg(feature = "wgpu")]
     Wgpu(iced_wgpu::Renderer),
+    Custom(Box<dyn custom::Renderer>),
 }
 
 macro_rules! delegate {
@@ -46,6 +48,7 @@ macro_rules! delegate {
             Self::TinySkia($name) => $body,
             #[cfg(feature = "wgpu")]
             Self::Wgpu($name) => $body,
+            Self::Custom($name) => $body,
         }
     };
 }
@@ -62,6 +65,9 @@ impl Renderer {
                     iced_wgpu::primitive::Custom::Mesh(mesh),
                 ));
             }
+            Self::Custom(renderer) => {
+                renderer.draw_mesh(mesh);
+            }
         }
     }
 }
@@ -96,6 +102,18 @@ impl core::Renderer for Renderer {
                     _ => unreachable!(),
                 }
             }
+            Self::Custom(renderer) => {
+                renderer.start_layer();
+
+                f(self);
+
+                match self {
+                    Self::Custom(renderer) => {
+                        renderer.end_layer(bounds);
+                    }
+                    _ => unreachable!(),
+                }
+            }
         }
     }
 
@@ -132,6 +150,18 @@ impl core::Renderer for Renderer {
                     _ => unreachable!(),
                 }
             }
+            Self::Custom(renderer) => {
+                renderer.start_transformation();
+
+                f(self);
+
+                match self {
+                    Self::Custom(renderer) => {
+                        renderer.end_transformation(transformation);
+                    }
+                    _ => unreachable!(),
+                }
+            }
         }
     }
 
@@ -140,7 +170,7 @@ impl core::Renderer for Renderer {
         quad: renderer::Quad,
         background: impl Into<Background>,
     ) {
-        delegate!(self, renderer, renderer.fill_quad(quad, background));
+        delegate!(self, renderer, renderer.fill_quad(quad, background.into()));
     }
 
     fn clear(&mut self) {
@@ -216,36 +246,43 @@ impl text::Renderer for Renderer {
 impl crate::core::image::Renderer for Renderer {
     type Handle = crate::core::image::Handle;
 
-    fn dimensions(
+    fn measure_image(
         &self,
         handle: &crate::core::image::Handle,
     ) -> core::Size<u32> {
-        delegate!(self, renderer, renderer.dimensions(handle))
+        delegate!(self, renderer, renderer.measure_image(handle))
     }
 
-    fn draw(
+    fn draw_image(
         &mut self,
         handle: crate::core::image::Handle,
         filter_method: crate::core::image::FilterMethod,
         bounds: Rectangle,
     ) {
-        delegate!(self, renderer, renderer.draw(handle, filter_method, bounds));
+        delegate!(
+            self,
+            renderer,
+            renderer.draw_image(handle, filter_method, bounds)
+        );
     }
 }
 
 #[cfg(feature = "svg")]
 impl crate::core::svg::Renderer for Renderer {
-    fn dimensions(&self, handle: &crate::core::svg::Handle) -> core::Size<u32> {
-        delegate!(self, renderer, renderer.dimensions(handle))
+    fn measure_svg(
+        &self,
+        handle: &crate::core::svg::Handle,
+    ) -> core::Size<u32> {
+        delegate!(self, renderer, renderer.measure_svg(handle))
     }
 
-    fn draw(
+    fn draw_svg(
         &mut self,
         handle: crate::core::svg::Handle,
         color: Option<crate::core::Color>,
         bounds: Rectangle,
     ) {
-        delegate!(self, renderer, renderer.draw(handle, color, bounds));
+        delegate!(self, renderer, renderer.draw_svg(handle, color, bounds));
     }
 }
 
@@ -263,6 +300,7 @@ impl crate::graphics::geometry::Renderer for Renderer {
                         }
                         #[cfg(feature = "wgpu")]
                         crate::Geometry::Wgpu(_) => unreachable!(),
+                        crate::Geometry::Custom(_) => unreachable!(),
                     }
                 }
             }
@@ -274,6 +312,19 @@ impl crate::graphics::geometry::Renderer for Renderer {
                             renderer.draw_primitive(primitive);
                         }
                         crate::Geometry::TinySkia(_) => unreachable!(),
+                        crate::Geometry::Custom(_) => unreachable!(),
+                    }
+                }
+            }
+            Self::Custom(renderer) => {
+                for layer in layers {
+                    match layer {
+                        crate::Geometry::Custom(geometry) => {
+                            renderer.draw_geometry(geometry);
+                        }
+                        crate::Geometry::TinySkia(_) => unreachable!(),
+                        #[cfg(feature = "wgpu")]
+                        crate::Geometry::Wgpu(_) => unreachable!(),
                     }
                 }
             }
@@ -297,6 +348,11 @@ impl iced_wgpu::primitive::pipeline::Renderer for Renderer {
             Self::Wgpu(renderer) => {
                 renderer.draw_pipeline_primitive(bounds, primitive);
             }
+            Self::Custom(_renderer) => {
+                log::warn!(
+                    "Custom shader primitive is unavailable with custom renderer."
+                );
+            }
         }
     }
 }