Scaffold `iced_tiny_skia` and connect it to `iced_renderer`

6 files changed, 247 insertions, 0 deletions

diff --git a/tiny_skia/Cargo.toml b/tiny_skia/Cargo.toml
new file mode 100644
index 00000000..7f4b0f8c
--- /dev/null
+++ b/tiny_skia/Cargo.toml
@@ -0,0 +1,21 @@
+[package]
+name = "iced_tiny_skia"
+version = "0.1.0"
+edition = "2021"
+
+[features]
+image = []
+svg = []
+
+[dependencies]
+raw-window-handle = "0.5"
+softbuffer = "0.2"
+tiny-skia = "0.8"
+
+[dependencies.iced_native]
+version = "0.9"
+path = "../native"
+
+[dependencies.iced_graphics]
+version = "0.7"
+path = "../graphics"
diff --git a/tiny_skia/src/backend.rs b/tiny_skia/src/backend.rs
new file mode 100644
index 00000000..4282a745
--- /dev/null
+++ b/tiny_skia/src/backend.rs
@@ -0,0 +1,87 @@
+use crate::{Font, Settings, Size};
+
+use iced_graphics::backend;
+use iced_graphics::text;
+
+use std::borrow::Cow;
+
+pub struct Backend {
+    default_font: Font,
+    default_text_size: f32,
+}
+
+impl Backend {
+    pub fn new(settings: Settings) -> Self {
+        Self {
+            default_font: settings.default_font,
+            default_text_size: settings.default_text_size,
+        }
+    }
+}
+
+impl iced_graphics::Backend for Backend {
+    fn trim_measurements(&mut self) {
+        // TODO
+    }
+}
+
+impl backend::Text for Backend {
+    const ICON_FONT: Font = Font::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,
+        _font: Font,
+        _bounds: Size,
+    ) -> (f32, f32) {
+        // TODO
+        (0.0, 0.0)
+    }
+
+    fn hit_test(
+        &self,
+        _contents: &str,
+        _size: f32,
+        _font: Font,
+        _bounds: Size,
+        _point: iced_native::Point,
+        _nearest_only: bool,
+    ) -> Option<text::Hit> {
+        // TODO
+        None
+    }
+
+    fn load_font(&mut self, _font: Cow<'static, [u8]>) {
+        // TODO
+    }
+}
+
+#[cfg(feature = "image")]
+impl backend::Image for Backend {
+    fn dimensions(&self, _handle: &iced_native::image::Handle) -> Size<u32> {
+        // TODO
+        Size::new(0, 0)
+    }
+}
+
+#[cfg(feature = "svg")]
+impl backend::Svg for Backend {
+    fn viewport_dimensions(
+        &self,
+        _handle: &iced_native::svg::Handle,
+    ) -> Size<u32> {
+        // TODO
+        Size::new(0, 0)
+    }
+}
diff --git a/tiny_skia/src/lib.rs b/tiny_skia/src/lib.rs
new file mode 100644
index 00000000..fce44e9e
--- /dev/null
+++ b/tiny_skia/src/lib.rs
@@ -0,0 +1,16 @@
+pub mod window;
+
+mod backend;
+mod settings;
+
+pub use backend::Backend;
+pub use settings::Settings;
+
+pub use iced_graphics::{Color, Error, Font, Point, Size, Vector, Viewport};
+
+/// A [`tiny-skia`] graphics renderer for [`iced`].
+///
+/// [`tiny-skia`]: https://github.com/RazrFalcon/tiny-skia
+/// [`iced`]: https://github.com/iced-rs/iced
+pub type Renderer<Theme = iced_native::Theme> =
+    iced_graphics::Renderer<Backend, Theme>;
diff --git a/tiny_skia/src/settings.rs b/tiny_skia/src/settings.rs
new file mode 100644
index 00000000..88098345
--- /dev/null
+++ b/tiny_skia/src/settings.rs
@@ -0,0 +1,24 @@
+use crate::Font;
+
+/// The settings of a [`Backend`].
+///
+/// [`Backend`]: crate::Backend
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct Settings {
+    /// The default [`Font`] to use.
+    pub default_font: Font,
+
+    /// The default size of text.
+    ///
+    /// By default, it will be set to `16.0`.
+    pub default_text_size: f32,
+}
+
+impl Default for Settings {
+    fn default() -> Settings {
+        Settings {
+            default_font: Font::SansSerif,
+            default_text_size: 16.0,
+        }
+    }
+}
diff --git a/tiny_skia/src/window.rs b/tiny_skia/src/window.rs
new file mode 100644
index 00000000..d8d9378e
--- /dev/null
+++ b/tiny_skia/src/window.rs
@@ -0,0 +1,3 @@
+pub mod compositor;
+
+pub use compositor::{Compositor, Surface};
diff --git a/tiny_skia/src/window/compositor.rs b/tiny_skia/src/window/compositor.rs
new file mode 100644
index 00000000..053bb29b
--- /dev/null
+++ b/tiny_skia/src/window/compositor.rs
@@ -0,0 +1,96 @@
+use crate::{Backend, Color, Error, Renderer, Settings, Viewport};
+
+use iced_graphics::window::compositor::{self, Information, SurfaceError};
+use iced_graphics::Primitive;
+
+use raw_window_handle::{HasRawDisplayHandle, HasRawWindowHandle};
+use std::marker::PhantomData;
+
+pub struct Compositor<Theme> {
+    _theme: PhantomData<Theme>,
+}
+
+pub struct Surface;
+
+impl<Theme> iced_graphics::window::Compositor for Compositor<Theme> {
+    type Settings = Settings;
+    type Renderer = Renderer<Theme>;
+    type Surface = Surface;
+
+    fn new<W: HasRawWindowHandle + HasRawDisplayHandle>(
+        settings: Self::Settings,
+        _compatible_window: Option<&W>,
+    ) -> Result<(Self, Self::Renderer), Error> {
+        let (compositor, backend) = new(settings);
+
+        Ok((compositor, Renderer::new(backend)))
+    }
+
+    fn create_surface<W: HasRawWindowHandle + HasRawDisplayHandle>(
+        &mut self,
+        _window: &W,
+    ) -> Surface {
+        // TODO
+        Surface
+    }
+
+    fn configure_surface(
+        &mut self,
+        _surface: &mut Surface,
+        _width: u32,
+        _height: u32,
+    ) {
+        // TODO
+    }
+
+    fn fetch_information(&self) -> Information {
+        Information {
+            adapter: String::from("CPU"),
+            backend: String::from("tiny-skia"),
+        }
+    }
+
+    fn present<T: AsRef<str>>(
+        &mut self,
+        renderer: &mut Self::Renderer,
+        surface: &mut Self::Surface,
+        viewport: &Viewport,
+        background_color: Color,
+        overlay: &[T],
+    ) -> Result<(), SurfaceError> {
+        renderer.with_primitives(|backend, primitives| {
+            present(
+                self,
+                backend,
+                surface,
+                primitives,
+                viewport,
+                background_color,
+                overlay,
+            )
+        })
+    }
+}
+
+pub fn new<Theme>(settings: Settings) -> (Compositor<Theme>, Backend) {
+    // TODO
+    (
+        Compositor {
+            _theme: PhantomData,
+        },
+        Backend::new(settings),
+    )
+}
+
+pub fn present<Theme, T: AsRef<str>>(
+    _compositor: &mut Compositor<Theme>,
+    _backend: &mut Backend,
+    _surface: &mut Surface,
+    _primitives: &[Primitive],
+    _viewport: &Viewport,
+    _background_color: Color,
+    _overlay: &[T],
+) -> Result<(), compositor::SurfaceError> {
+    // TODO
+    Ok(())
+}