Implement basic presentation with softbuffer for iced_tiny_skia

graphics/src/window/compositor.rs

@@ -28,6 +28,8 @@ pub trait Compositor: Sized {
     fn create_surface<W: HasRawWindowHandle + HasRawDisplayHandle>(
         &mut self,
         window: &W,
+        width: u32,
+        height: u32,
     ) -> Self::Surface;
 
     /// Configures a new [`Surface`] with the given dimensions.

renderer/src/window/compositor.rs

@@ -52,14 +52,16 @@ impl<Theme> iced_graphics::window::Compositor for Compositor<Theme> {
     fn create_surface<W: HasRawWindowHandle + HasRawDisplayHandle>(
         &mut self,
         window: &W,
+        width: u32,
+        height: u32,
     ) -> Surface {
         match self {
             Self::Wgpu(compositor) => {
-                Surface::Wgpu(compositor.create_surface(window))
-            }
-            Self::TinySkia(compositor) => {
-                Surface::TinySkia(compositor.create_surface(window))
+                Surface::Wgpu(compositor.create_surface(window, width, height))
             }
+            Self::TinySkia(compositor) => Surface::TinySkia(
+                compositor.create_surface(window, width, height),
+            ),
         }
     }
 

tiny_skia/src/backend.rs

@@ -1,7 +1,8 @@
-use crate::{Font, Settings, Size};
+use crate::{Color, Font, Settings, Size, Viewport};
 
 use iced_graphics::backend;
 use iced_graphics::text;
+use iced_graphics::Primitive;
 
 use std::borrow::Cow;
 
@@ -17,6 +18,22 @@ impl Backend {
             default_text_size: settings.default_text_size,
         }
     }
+
+    pub fn draw<T: AsRef<str>>(
+        &mut self,
+        pixels: &mut tiny_skia::Pixmap,
+        _primitives: &[Primitive],
+        _viewport: &Viewport,
+        background_color: Color,
+        _overlay: &[T],
+    ) {
+        pixels.fill(into_color(background_color));
+    }
+}
+
+fn into_color(color: Color) -> tiny_skia::Color {
+    tiny_skia::Color::from_rgba(color.r, color.g, color.b, color.a)
+        .expect("Convert color from iced to tiny_skia")
 }
 
 impl iced_graphics::Backend for Backend {

tiny_skia/src/window/compositor.rs

@@ -10,7 +10,11 @@ pub struct Compositor<Theme> {
     _theme: PhantomData<Theme>,
 }
 
-pub struct Surface;
+pub struct Surface {
+    window: softbuffer::GraphicsContext,
+    pixels: tiny_skia::Pixmap,
+    buffer: Vec<u32>,
+}
 
 impl<Theme> iced_graphics::window::Compositor for Compositor<Theme> {
     type Settings = Settings;
@@ -28,19 +32,33 @@ impl<Theme> iced_graphics::window::Compositor for Compositor<Theme> {
 
     fn create_surface<W: HasRawWindowHandle + HasRawDisplayHandle>(
         &mut self,
-        _window: &W,
+        window: &W,
+        width: u32,
+        height: u32,
     ) -> Surface {
-        // TODO
-        Surface
+        let window =
+            unsafe { softbuffer::GraphicsContext::new(window, window) }
+                .expect("Create softbuffer for window");
+
+        let pixels = tiny_skia::Pixmap::new(width, height)
+            .expect("Create pixmap for window");
+
+        Surface {
+            window,
+            pixels,
+            buffer: vec![0; (width * height) as usize],
+        }
     }
 
     fn configure_surface(
         &mut self,
-        _surface: &mut Surface,
-        _width: u32,
-        _height: u32,
+        surface: &mut Surface,
+        width: u32,
+        height: u32,
     ) {
-        // TODO
+        surface.pixels = tiny_skia::Pixmap::new(width, height)
+            .expect("Create pixmap for window");
+        surface.buffer = vec![0; (width * height) as usize];
     }
 
     fn fetch_information(&self) -> Information {
@@ -84,13 +102,33 @@ pub fn new<Theme>(settings: Settings) -> (Compositor<Theme>, Backend) {
 
 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],
+    backend: &mut Backend,
+    surface: &mut Surface,
+    primitives: &[Primitive],
+    viewport: &Viewport,
+    background_color: Color,
+    overlay: &[T],
 ) -> Result<(), compositor::SurfaceError> {
+    backend.draw(
+        &mut surface.pixels,
+        primitives,
+        viewport,
+        background_color,
+        overlay,
+    );
+
+    for (i, pixel) in surface.pixels.pixels_mut().iter().enumerate() {
+        surface.buffer[i] = u32::from(pixel.red()) << 16
+            | u32::from(pixel.green()) << 8
+            | u32::from(pixel.blue());
+    }
+
+    surface.window.set_buffer(
+        &surface.buffer,
+        surface.pixels.width() as u16,
+        surface.pixels.height() as u16,
+    );
+
     // TODO
     Ok(())
 }

wgpu/src/window/compositor.rs

@@ -201,11 +201,15 @@ impl<Theme> iced_graphics::window::Compositor for Compositor<Theme> {
     fn create_surface<W: HasRawWindowHandle + HasRawDisplayHandle>(
         &mut self,
         window: &W,
+        width: u32,
+        height: u32,
     ) -> wgpu::Surface {
         #[allow(unsafe_code)]
-        unsafe {
-            self.instance.create_surface(window)
-        }
+        let mut surface = unsafe { self.instance.create_surface(window) };
+
+        self.configure_surface(&mut surface, width, height);
+
+        surface
     }
 
     fn configure_surface(

winit/src/application.rs

@@ -285,21 +285,18 @@ async fn run_instance<A, E, C>(
     use winit::event;
     use winit::event_loop::ControlFlow;
 
-    let mut clipboard = Clipboard::connect(&window);
-    let mut cache = user_interface::Cache::default();
-    let mut surface = compositor.create_surface(&window);
-    let mut should_exit = false;
-
     let mut state = State::new(&application, &window);
     let mut viewport_version = state.viewport_version();
-
     let physical_size = state.physical_size();
 
-    compositor.configure_surface(
-        &mut surface,
+    let mut clipboard = Clipboard::connect(&window);
+    let mut cache = user_interface::Cache::default();
+    let mut surface = compositor.create_surface(
+        &window,
         physical_size.width,
         physical_size.height,
     );
+    let mut should_exit = false;
 
     if should_be_visible {
         window.set_visible(true);