🎉 Implement boolean operations (wasm)

frontend/src/app/render_wasm/api.cljs

@@ -93,6 +93,9 @@
     (= type :path)
     (h/call internal-module "_set_shape_kind_path")
 
+    (= type :bool)
+    (h/call internal-module "_set_shape_kind_bool")
+
     :else
     (h/call internal-module "_set_shape_kind_rect")))
 
@@ -343,6 +346,24 @@
   [hidden]
   (h/call internal-module "_set_shape_hidden" hidden))
 
+
+(defn- translate-bool-type
+  [bool-type]
+  (case bool-type
+    :union 0
+    :difference 1
+    :intersection 2
+    :exclusion 3
+    0))
+
+(defn set-shape-bool-type
+  [bool-type]
+  (h/call internal-module "_set_shape_bool_type" (translate-bool-type bool-type)))
+
+(defn set-shape-bool-content
+  [content]
+  (set-shape-path-content content))
+
 (def debounce-render-without-cache (fns/debounce render-without-cache 100))
 
 (defn set-view
@@ -373,7 +394,8 @@
                   blend-mode   (dm/get-prop shape :blend-mode)
                   opacity      (dm/get-prop shape :opacity)
                   hidden       (dm/get-prop shape :hidden)
-                  content      (dm/get-prop shape :content)]
+                  content      (dm/get-prop shape :content)
+                  bool-content (dm/get-prop shape :bool-content)]
 
               (use-shape id)
               (set-shape-type type)
@@ -386,6 +408,7 @@
               (set-shape-opacity opacity)
               (set-shape-hidden hidden)
               (when (and (some? content) (= type :path)) (set-shape-path-content content))
+              (when (some? bool-content) (set-shape-bool-content bool-content))
               (let [pending' (concat (set-shape-fills fills) (set-shape-strokes strokes))]
                 (recur (inc index) (into pending pending'))))
             pending))]

frontend/src/app/render_wasm/shape.cljs

@@ -112,6 +112,8 @@
     (api/use-shape (:id self))
     (case k
       :type         (api/set-shape-type v)
+      :bool-type    (api/set-shape-bool-type v)
+      :bool-content (api/set-shape-bool-content v)
       :selrect      (api/set-shape-selrect v)
       :show-content (api/set-shape-clip-content (not v))
       :rotation     (api/set-shape-rotation v)

render-wasm/docs/serialization.md

@@ -40,7 +40,7 @@ Gradient stops are serialized in a `Uint8Array`, each stop taking **5 bytes**.
 
 **Stop offset** is the offset, being integer values ranging from `0` to `100` (both inclusive).
 
-## StrokeCap
+## Stroke Caps
 
 Stroke caps are serialized as `u8`:
 
@@ -53,9 +53,9 @@ Stroke caps are serialized as `u8`:
 | 5     | Diamond   |
 | 6     | Round     |
 | 7     | Square    |
-| _     | None      |
+| \_    | None      |
 
-## StrokeStyle
+## Stroke Sytles
 
 Stroke styles are serialized as `u8`:
 
@@ -64,4 +64,16 @@ Stroke styles are serialized as `u8`:
 | 1     | Dotted |
 | 2     | Dashed |
 | 3     | Mixed  |
-| _     | Solid  |
+| \_    | Solid  |
+
+## Bool Operations
+
+Bool operations (`bool-type`) are serialized as `u8`:
+
+| Value | Field        |
+| ----- | ------------ |
+| 0     | Union        |
+| 1     | Difference   |
+| 2     | Intersection |
+| 3     | Exclusion    |
+| \_    | Union        |

render-wasm/src/main.rs

@@ -7,8 +7,7 @@ mod state;
 mod utils;
 mod view;
 
-use crate::shapes::Kind;
-use crate::shapes::Path;
+use crate::shapes::{BoolType, Kind, Path};
 use skia_safe as skia;
 
 use crate::state::State;
@@ -134,8 +133,26 @@ pub unsafe extern "C" fn set_shape_kind_rect() {
 pub unsafe extern "C" fn set_shape_kind_path() {
     let state = unsafe { STATE.as_mut() }.expect("got an invalid state pointer");
     if let Some(shape) = state.current_shape() {
-        let p = Path::try_from(Vec::new()).unwrap();
-        shape.set_kind(Kind::Path(p));
+        shape.set_kind(Kind::Path(Path::default()));
+    }
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn set_shape_kind_bool() {
+    let state = unsafe { STATE.as_mut() }.expect("got an invalid state pointer");
+    if let Some(shape) = state.current_shape() {
+        match shape.kind() {
+            Kind::Bool(_, _) => {}
+            _ => shape.set_kind(Kind::Bool(BoolType::default(), Path::default())),
+        }
+    }
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn set_shape_bool_type(raw_bool_type: u8) {
+    let state = unsafe { STATE.as_mut() }.expect("got an invalid state pointer");
+    if let Some(shape) = state.current_shape() {
+        shape.set_bool_type(BoolType::from(raw_bool_type))
     }
 }
 

render-wasm/src/shapes.rs

@@ -4,6 +4,7 @@ use uuid::Uuid;
 
 use crate::render::{BlendMode, Renderable};
 
+mod bools;
 mod fills;
 mod images;
 mod matrix;
@@ -11,6 +12,7 @@ mod paths;
 mod renderable;
 mod strokes;
 
+pub use bools::*;
 pub use fills::*;
 pub use images::*;
 use matrix::*;
@@ -22,6 +24,7 @@ pub enum Kind {
     Rect(math::Rect),
     Circle(math::Rect),
     Path(Path),
+    Bool(BoolType, Path),
 }
 
 pub type Color = skia::Color;
@@ -61,6 +64,10 @@ impl Shape {
         }
     }
 
+    pub fn kind(&self) -> Kind {
+        self.kind.clone()
+    }
+
     pub fn set_selrect(&mut self, left: f32, top: f32, right: f32, bottom: f32) {
         self.selrect.set_ltrb(left, top, right, bottom);
         match self.kind {
@@ -169,7 +176,12 @@ impl Shape {
 
     pub fn set_path_segments(&mut self, buffer: Vec<RawPathData>) -> Result<(), String> {
         let p = Path::try_from(buffer)?;
-        self.kind = Kind::Path(p);
+        let kind = match &self.kind {
+            Kind::Bool(bool_type, _) => Kind::Bool(*bool_type, p),
+            _ => Kind::Path(p),
+        };
+        self.kind = kind;
+
         Ok(())
     }
 
@@ -177,9 +189,18 @@ impl Shape {
         self.blend_mode = mode;
     }
 
+    pub fn set_bool_type(&mut self, bool_type: BoolType) {
+        let kind = match &self.kind {
+            Kind::Bool(_, path) => Kind::Bool(bool_type, path.clone()),
+            _ => Kind::Bool(bool_type, Path::default()),
+        };
+
+        self.kind = kind;
+    }
+
     fn to_path_transform(&self) -> Option<skia::Matrix> {
         match self.kind {
-            Kind::Path(_) => {
+            Kind::Path(_) | Kind::Bool(_, _) => {
                 let center = self.bounds().center();
                 let mut matrix = skia::Matrix::new_identity();
                 matrix.pre_translate(center);

render-wasm/src/shapes/bools.rs

@@ -0,0 +1,25 @@
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub enum BoolType {
+    Union,
+    Difference,
+    Intersection,
+    Exclusion,
+}
+
+impl From<u8> for BoolType {
+    fn from(value: u8) -> Self {
+        match value {
+            0 => Self::Union,
+            1 => Self::Difference,
+            2 => Self::Intersection,
+            3 => Self::Exclusion,
+            _ => Self::default(),
+        }
+    }
+}
+
+impl Default for BoolType {
+    fn default() -> Self {
+        Self::Union
+    }
+}

render-wasm/src/shapes/paths.rs

@@ -88,6 +88,12 @@ fn starts_and_ends_at_same_point(path: &skia::Path) -> bool {
     start_point == end_point
 }
 
+impl Default for Path {
+    fn default() -> Self {
+        Path::try_from(Vec::new()).unwrap()
+    }
+}
+
 impl TryFrom<Vec<RawPathData>> for Path {
     type Error = String;
 

render-wasm/src/shapes/renderable.rs

@@ -64,7 +64,11 @@ impl Renderable for Shape {
     }
 
     fn children_ids(&self) -> Vec<Uuid> {
-        self.children.clone()
+        if let Kind::Bool(_, _) = self.kind {
+            vec![]
+        } else {
+            self.children.clone()
+        }
     }
 }
 
@@ -97,7 +101,7 @@ fn render_fill(
         (_, Kind::Circle(rect)) => {
             surface.canvas().draw_oval(rect, &fill.to_paint(&selrect));
         }
-        (_, Kind::Path(path)) => {
+        (_, Kind::Path(path)) | (_, Kind::Bool(_, path)) => {
             surface.canvas().draw_path(
                 &path.to_skia_path().transform(path_transform.unwrap()),
                 &fill.to_paint(&selrect),
@@ -130,7 +134,7 @@ fn render_stroke(
         match kind {
             Kind::Rect(rect) => draw_stroke_on_rect(surface.canvas(), stroke, rect, &selrect),
             Kind::Circle(rect) => draw_stroke_on_circle(surface.canvas(), stroke, rect, &selrect),
-            Kind::Path(path) => {
+            Kind::Path(path) | Kind::Bool(_, path) => {
                 draw_stroke_on_path(surface.canvas(), stroke, path, &selrect, path_transform);
             }
         }
@@ -439,7 +443,7 @@ pub fn draw_image_fill_in_container(
             oval_path.add_oval(container, None);
             canvas.clip_path(&oval_path, skia::ClipOp::Intersect, true);
         }
-        Kind::Path(p) => {
+        Kind::Path(p) | Kind::Bool(_, p) => {
             canvas.clip_path(
                 &p.to_skia_path().transform(path_transform.unwrap()),
                 skia::ClipOp::Intersect,
@@ -476,7 +480,7 @@ pub fn draw_image_stroke_in_container(
         match kind {
             Kind::Rect(rect) => draw_stroke_on_rect(canvas, stroke, rect, &outer_rect),
             Kind::Circle(rect) => draw_stroke_on_circle(canvas, stroke, rect, &outer_rect),
-            Kind::Path(p) => {
+            Kind::Path(p) | Kind::Bool(_, p) => {
                 let mut path = p.to_skia_path();
                 path.transform(path_transform.unwrap());
                 let stroke_kind = stroke.render_kind(p.is_open());