♻️ Refactor debug options into its own struct, along with dpr

frontend/src/app/render_wasm/api.cljs

@@ -181,17 +181,17 @@
 (defn assign-canvas
   [canvas]
   (let [gl      (unchecked-get internal-module "GL")
-        init-fn (unchecked-get internal-module "_init")
-
         context (.getContext ^js canvas "webgl2" canvas-options)
+        dpr     js/window.devicePixelRatio
 
         ;; Register the context with emscripten
         handle  (.registerContext ^js gl context #js {"majorVersion" 2})]
     (.makeContextCurrent ^js gl handle)
-    ;; Initialize Skia
-    (^function init-fn (.-width ^js canvas)
-                       (.-height ^js canvas)
-                       1)
+
+    ;; Initialize Wasm Render Engine
+    (h/call internal-module "_init" (.-width ^js canvas) (.-height ^js canvas))
+    (h/call internal-module "_set_render_options" 0x01 (or dpr 0))
+
     (set! (.-width canvas) (.-clientWidth ^js canvas))
     (set! (.-height canvas) (.-clientHeight ^js canvas))))
 

render-wasm/src/main.rs

@@ -1,11 +1,11 @@
-pub mod debug;
-pub mod images;
-pub mod math;
-pub mod render;
-pub mod shapes;
-pub mod state;
-pub mod utils;
-pub mod view;
+mod debug;
+mod images;
+mod math;
+mod render;
+mod shapes;
+mod state;
+mod utils;
+mod view;
 
 use skia_safe as skia;
 
@@ -31,13 +31,24 @@ fn init_gl() {
 
 /// This is called from JS after the WebGL context has been created.
 #[no_mangle]
-pub extern "C" fn init(width: i32, height: i32, debug: u32) {
-    let state_box = Box::new(State::with_capacity(width, height, debug, 2048));
+pub extern "C" fn init(width: i32, height: i32) {
+    let state_box = Box::new(State::new(width, height, 2048));
     unsafe {
         STATE = Some(state_box);
     }
 }
 
+#[no_mangle]
+pub extern "C" fn set_render_options(debug: u32, dpr: f32) {
+    let state = unsafe { STATE.as_mut() }.expect("got an invalid state pointer");
+    let render_state = state.render_state();
+
+    render_state.set_debug_flags(debug);
+    if dpr > 1.0 {
+        render_state.set_dpr(Some(dpr));
+    }
+}
+
 #[no_mangle]
 pub unsafe extern "C" fn render() {
     let state = unsafe { STATE.as_mut() }.expect("got an invalid state pointer");

render-wasm/src/render.rs

@@ -59,12 +59,25 @@ pub(crate) struct CachedSurfaceImage {
     pub is_complete: bool,
 }
 
+#[derive(Debug, Default, Copy, Clone, PartialEq)]
+struct RenderOptions {
+    debug_flags: u32,
+    dpr: Option<f32>,
+}
+
+impl RenderOptions {
+    pub fn is_debug_visible(&self) -> bool {
+        self.debug_flags & debug::DEBUG_VISIBLE == debug::DEBUG_VISIBLE
+    }
+}
+
 pub(crate) struct RenderState {
     gpu_state: GpuState,
     pub final_surface: skia::Surface,
     pub drawing_surface: skia::Surface,
     pub debug_surface: skia::Surface,
     pub cached_surface_image: Option<CachedSurfaceImage>,
+    options: RenderOptions,
 }
 
 impl RenderState {
@@ -85,9 +98,18 @@ impl RenderState {
             drawing_surface,
             debug_surface,
             cached_surface_image: None,
+            options: RenderOptions::default(),
         }
     }
 
+    pub fn set_debug_flags(&mut self, debug: u32) {
+        self.options.debug_flags = debug;
+    }
+
+    pub fn set_dpr(&mut self, dpr: Option<f32>) {
+        self.options.dpr = dpr;
+    }
+
     pub fn resize(&mut self, width: i32, height: i32) {
         let surface = self.gpu_state.create_target_surface(width, height);
         self.final_surface = surface;
@@ -176,7 +198,7 @@ impl RenderState {
             .clear(skia::Color::TRANSPARENT);
     }
 
-    pub fn navigate(&mut self, viewbox: &Viewbox, shapes: &HashMap<Uuid, Shape>, debug: u32) {
+    pub fn navigate(&mut self, viewbox: &Viewbox, shapes: &HashMap<Uuid, Shape>) {
         self.reset_canvas();
         if let Some(cached_surface_image) = &self.cached_surface_image {
             // If we are drawing something bigger than the visible let's do a redraw
@@ -190,7 +212,7 @@ impl RenderState {
                         > -cached_surface_image.viewbox.y
                             + cached_surface_image.viewbox.area.height()))
             {
-                self.render_all(viewbox, shapes, true, debug);
+                self.render_all(viewbox, shapes, true);
             } else {
                 let image = &cached_surface_image.image;
                 let paint = skia::Paint::default();
@@ -226,11 +248,11 @@ impl RenderState {
         viewbox: &Viewbox,
         shapes: &HashMap<Uuid, Shape>,
         generate_cached_surface_image: bool,
-        debug: u32, // Debug flags
     ) {
         self.reset_canvas();
         self.scale(viewbox.zoom, viewbox.zoom);
         self.translate(viewbox.x, viewbox.y);
+
         let is_complete = self.render_shape_tree(&Uuid::nil(), viewbox, shapes);
         if generate_cached_surface_image || self.cached_surface_image.is_none() {
             self.cached_surface_image = Some(CachedSurfaceImage {
@@ -239,7 +261,8 @@ impl RenderState {
                 is_complete,
             });
         }
-        if debug & debug::DEBUG_VISIBLE == debug::DEBUG_VISIBLE {
+
+        if self.options.is_debug_visible() {
             self.render_debug(viewbox);
         }
 
@@ -251,12 +274,14 @@ impl RenderState {
         paint.set_style(skia::PaintStyle::Stroke);
         paint.set_color(skia::Color::from_argb(255, 255, 0, 255));
         paint.set_stroke_width(1.);
+
         let mut scaled_rect = viewbox.area.clone();
         let x = 100. + scaled_rect.x() * 0.2;
         let y = 100. + scaled_rect.y() * 0.2;
         let width = scaled_rect.width() * 0.2;
         let height = scaled_rect.height() * 0.2;
         scaled_rect.set_xywh(x, y, width, height);
+
         self.debug_surface.canvas().draw_rect(scaled_rect, &paint);
     }
 
@@ -269,12 +294,14 @@ impl RenderState {
             skia::Color::from_argb(255, 0, 255, 255)
         });
         paint.set_stroke_width(1.);
+
         let mut scaled_rect = shape.selrect.clone();
         let x = 100. + scaled_rect.x() * 0.2;
         let y = 100. + scaled_rect.y() * 0.2;
         let width = scaled_rect.width() * 0.2;
         let height = scaled_rect.height() * 0.2;
         scaled_rect.set_xywh(x, y, width, height);
+
         self.debug_surface.canvas().draw_rect(scaled_rect, &paint);
     }
 

render-wasm/src/state.rs

@@ -12,7 +12,6 @@ use crate::view::Viewbox;
 /// Note that rust-skia data structures are not thread safe, so a state
 /// must not be shared between different Web Workers.
 pub(crate) struct State<'a> {
-    pub debug: u32,
     pub render_state: RenderState,
     pub current_id: Option<Uuid>,
     pub current_shape: Option<&'a mut Shape>,
@@ -21,9 +20,8 @@ pub(crate) struct State<'a> {
 }
 
 impl<'a> State<'a> {
-    pub fn with_capacity(width: i32, height: i32, debug: u32, capacity: usize) -> Self {
+    pub fn new(width: i32, height: i32, capacity: usize) -> Self {
         State {
-            debug,
             render_state: RenderState::new(width, height),
             current_id: None,
             current_shape: None,
@@ -49,17 +47,12 @@ impl<'a> State<'a> {
     }
 
     pub fn navigate(&mut self) {
-        self.render_state
-            .navigate(&self.viewbox, &self.shapes, self.debug);
+        self.render_state.navigate(&self.viewbox, &self.shapes);
     }
 
     pub fn render_all(&mut self, generate_cached_surface_image: bool) {
-        self.render_state.render_all(
-            &self.viewbox,
-            &self.shapes,
-            generate_cached_surface_image,
-            self.debug,
-        );
+        self.render_state
+            .render_all(&self.viewbox, &self.shapes, generate_cached_surface_image);
     }
 
     pub fn use_shape(&'a mut self, id: Uuid) {