Merge pull request #5992 from penpot/elenatorro-10314-use-mutex-for-static-mut

🔧 Do not use global static mut variables when possible

docker/devenv/Dockerfile

@@ -264,7 +264,8 @@ RUN set -eux; \
     ./rustup-init -y --no-modify-path --profile minimal --default-toolchain $RUST_VERSION --default-host ${rustArch}; \
     rm rustup-init; \
     chmod -R a+w $RUSTUP_HOME $CARGO_HOME; \
-    rustup component add rustfmt;
+    rustup component add rustfmt; \
+    rustup component add clippy;
 
 WORKDIR /usr/local
 

render-wasm/lint

@@ -0,0 +1,50 @@
+#!/usr/bin/env bash
+
+# Enable debugging if the script is run with --debug
+if [[ "$1" == "--debug" ]]; then
+    set -x
+fi
+
+. ./_build_env
+
+ALLOWED_RULES="
+        -A clippy::box_collection \
+        -A clippy::clone_on_copy \
+        -A clippy::derivable_impls \
+        -A clippy::enum_variant_names \
+        -A clippy::field_reassign_with_default \
+        -A clippy::from_over_into \
+        -A clippy::len_zero \
+        -A clippy::manual_map \
+        -A clippy::map_entry \
+        -A clippy::missing_safety_doc \
+        -A clippy::missing_transmute_annotations \
+        -A clippy::needless_borrow \
+        -A clippy::needless_borrows_for_generic_args \
+        -A clippy::needless_range_loop \
+        -A clippy::needless_return \
+        -A clippy::redundant_closure \
+        -A clippy::redundant_field_names \
+        -A clippy::single_match \
+        -A clippy::slow_vector_initialization \
+        -A clippy::too_many_arguments \
+        -A clippy::unnecessary_to_owned \
+        -A clippy::unused_unit \
+        -A clippy::unwrap_or_default \
+        -A clippy::useless_format \
+        -A clippy::wrong_self_convention \
+        -A dead_code"
+
+# ./lint --fix
+if [[ "$1" == "--fix" ]]; then
+    cargo clippy \
+        --fix --allow-dirty \
+        --target=wasm32-unknown-emscripten \
+        -- -D warnings \
+        $ALLOWED_RULES
+else
+    cargo clippy \
+        --target=wasm32-unknown-emscripten \
+        -- -D warnings \
+        $ALLOWED_RULES
+fi

render-wasm/src/main.rs

@@ -24,6 +24,22 @@ extern "C" {
     ) -> *const ::std::os::raw::c_void;
 }
 
+macro_rules! with_state {
+    ($state:ident, $block:block) => {
+        let $state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
+        $block
+    };
+}
+
+macro_rules! with_current_shape {
+    ($state:ident, |$shape:ident: &mut Shape| $block:block) => {
+        let $state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
+        if let Some($shape) = $state.current_shape() {
+            $block
+        }
+    };
+}
+
 fn init_gl() {
     unsafe {
         gl::load_with(|addr| {
@@ -50,167 +66,167 @@ pub extern "C" fn clean_up() {
 
 #[no_mangle]
 pub extern "C" fn clear_cache() {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    let render_state = state.render_state();
-    render_state.clear_cache();
+    with_state!(state, {
+        let render_state = state.render_state();
+        render_state.clear_cache();
+    });
 }
 
 #[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);
-    render_state.set_dpr(dpr);
+    with_state!(state, {
+        let render_state = state.render_state();
+        render_state.set_debug_flags(debug);
+        render_state.set_dpr(dpr);
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn set_canvas_background(raw_color: u32) {
-    let state = unsafe { STATE.as_mut() }.expect("got an invalid state pointer");
-    let color = skia::Color::new(raw_color);
-    state.set_background_color(color);
+    with_state!(state, {
+        let color = skia::Color::new(raw_color);
+        state.set_background_color(color);
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn render(timestamp: i32) {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    state.start_render_loop(timestamp).expect("Error rendering");
+    with_state!(state, {
+        state.start_render_loop(timestamp).expect("Error rendering");
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn render_from_cache() {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    state.render_from_cache();
+    with_state!(state, {
+        state.render_from_cache();
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn process_animation_frame(timestamp: i32) {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    state
-        .process_animation_frame(timestamp)
-        .expect("Error processing animation frame");
+    with_state!(state, {
+        state
+            .process_animation_frame(timestamp)
+            .expect("Error processing animation frame");
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn reset_canvas() {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    state.render_state().reset_canvas();
+    with_state!(state, {
+        state.render_state().reset_canvas();
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn resize_viewbox(width: i32, height: i32) {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    state.resize(width, height);
+    with_state!(state, {
+        state.resize(width, height);
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn set_view(zoom: f32, x: f32, y: f32) {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    let render_state = state.render_state();
-    render_state.invalidate_cache_if_needed();
-    render_state.viewbox.set_all(zoom, x, y);
+    with_state!(state, {
+        let render_state = state.render_state();
+        render_state.invalidate_cache_if_needed();
+        render_state.viewbox.set_all(zoom, x, y);
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn set_view_zoom(zoom: f32) {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    state.render_state().viewbox.set_zoom(zoom);
+    with_state!(state, {
+        state.render_state().viewbox.set_zoom(zoom);
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn set_view_xy(x: f32, y: f32) {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    state.render_state().viewbox.set_pan_xy(x, y);
+    with_state!(state, {
+        state.render_state().viewbox.set_pan_xy(x, y);
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn use_shape(a: u32, b: u32, c: u32, d: u32) {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    let id = uuid_from_u32_quartet(a, b, c, d);
-    state.use_shape(id);
+    with_state!(state, {
+        let id = uuid_from_u32_quartet(a, b, c, d);
+        state.use_shape(id);
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn set_shape_masked_group(masked: bool) {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         shape.set_masked(masked);
-    }
+    });
 }
 
 #[no_mangle]
 pub 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))
-    }
+    with_current_shape!(state, |shape: &mut Shape| {
+        shape.set_bool_type(BoolType::from(raw_bool_type));
+    });
 }
 
 #[no_mangle]
 pub unsafe extern "C" fn set_shape_type(shape_type: u8) {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         shape.set_shape_type(Type::from(shape_type));
-    }
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn set_shape_selrect(left: f32, top: f32, right: f32, bottom: f32) {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         shape.set_selrect(left, top, right, bottom);
-    }
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn set_shape_clip_content(clip_content: bool) {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         shape.set_clip(clip_content);
-    }
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn set_shape_rotation(rotation: f32) {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         shape.set_rotation(rotation);
-    }
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn set_shape_transform(a: f32, b: f32, c: f32, d: f32, e: f32, f: f32) {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         shape.set_transform(a, b, c, d, e, f);
-    }
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn add_shape_child(a: u32, b: u32, c: u32, d: u32) {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    let id = uuid_from_u32_quartet(a, b, c, d);
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
+        let id = uuid_from_u32_quartet(a, b, c, d);
         shape.add_child(id);
-    }
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn clear_shape_children() {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         shape.clear_children();
-    }
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn add_shape_solid_fill(raw_color: u32) {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         let color = skia::Color::new(raw_color);
         shape.add_fill(shapes::Fill::Solid(color));
-    }
+    });
 }
 
 #[no_mangle]
@@ -221,14 +237,13 @@ pub extern "C" fn add_shape_linear_fill(
     end_y: f32,
     opacity: f32,
 ) {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         shape.add_fill(shapes::Fill::new_linear_gradient(
             (start_x, start_y),
             (end_x, end_y),
             opacity,
-        ))
-    }
+        ));
+    });
 }
 
 #[no_mangle]
@@ -240,15 +255,14 @@ pub extern "C" fn add_shape_radial_fill(
     opacity: f32,
     width: f32,
 ) {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         shape.add_fill(shapes::Fill::new_radial_gradient(
             (start_x, start_y),
             (end_x, end_y),
             opacity,
             width,
-        ))
-    }
+        ));
+    });
 }
 
 #[no_mangle]
@@ -260,58 +274,63 @@ pub extern "C" fn add_shape_fill_stops() {
         .map(|data| shapes::RawStopData::from_bytes(data.try_into().unwrap()))
         .collect();
 
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         shape
             .add_fill_gradient_stops(entries)
             .expect("could not add gradient stops");
-    }
+    });
+
     mem::free_bytes();
 }
 
 #[no_mangle]
 pub extern "C" fn store_font(family_name_size: u32, font_size: u32) {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    unsafe {
-        let font_bytes =
-            Vec::<u8>::from_raw_parts(mem::buffer_ptr(), font_size as usize, font_size as usize);
-        let family_name = String::from_raw_parts(
-            mem::buffer_ptr().add(font_size as usize),
-            family_name_size as usize,
-            family_name_size as usize,
-        );
-        match state.render_state().add_font(family_name, &font_bytes) {
+    with_state!(state, {
+        unsafe {
+            let font_bytes = Vec::<u8>::from_raw_parts(
+                mem::buffer_ptr(),
+                font_size as usize,
+                font_size as usize,
+            );
+            let family_name = String::from_raw_parts(
+                mem::buffer_ptr().add(font_size as usize),
+                family_name_size as usize,
+                family_name_size as usize,
+            );
+            match state.render_state().add_font(family_name, &font_bytes) {
+                Err(msg) => {
+                    eprintln!("{}", msg);
+                }
+                _ => {}
+            }
+            mem::free_bytes();
+        }
+    });
+}
+
+#[no_mangle]
+pub extern "C" fn store_image(a: u32, b: u32, c: u32, d: u32) {
+    with_state!(state, {
+        let id = uuid_from_u32_quartet(a, b, c, d);
+        let image_bytes = mem::bytes();
+
+        match state.render_state().add_image(id, &image_bytes) {
             Err(msg) => {
                 eprintln!("{}", msg);
             }
             _ => {}
         }
+
         mem::free_bytes();
-    }
-}
-
-#[no_mangle]
-pub extern "C" fn store_image(a: u32, b: u32, c: u32, d: u32) {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    let id = uuid_from_u32_quartet(a, b, c, d);
-    let image_bytes = mem::bytes();
-
-    match state.render_state().add_image(id, &image_bytes) {
-        Err(msg) => {
-            eprintln!("{}", msg);
-        }
-        _ => {}
-    }
-
-    mem::free_bytes();
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn is_image_cached(a: u32, b: u32, c: u32, d: u32) -> bool {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    let id = uuid_from_u32_quartet(a, b, c, d);
-    state.render_state().has_image(&id)
+    with_state!(state, {
+        let id = uuid_from_u32_quartet(a, b, c, d);
+        return state.render_state().has_image(&id);
+    });
 }
 
 #[no_mangle]
@@ -324,29 +343,26 @@ pub extern "C" fn add_shape_image_fill(
     width: i32,
     height: i32,
 ) {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    let id = uuid_from_u32_quartet(a, b, c, d);
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
+        let id = uuid_from_u32_quartet(a, b, c, d);
         shape.add_fill(shapes::Fill::new_image_fill(
             id,
             (alpha * 0xff as f32).floor() as u8,
             (width, height),
         ));
-    }
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn clear_shape_fills() {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         shape.clear_fills();
-    }
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn set_shape_svg_raw_content() {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         let bytes = mem::bytes();
         let svg_raw_content = String::from_utf8(bytes)
             .unwrap()
@@ -355,62 +371,54 @@ pub extern "C" fn set_shape_svg_raw_content() {
         shape
             .set_svg_raw_content(svg_raw_content)
             .expect("Failed to set svg raw content");
-    }
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn set_shape_blend_mode(mode: i32) {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         shape.set_blend_mode(render::BlendMode::from(mode));
-    }
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn set_shape_opacity(opacity: f32) {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         shape.set_opacity(opacity);
-    }
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn set_shape_constraint_h(constraint: u8) {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    if let Some(shape) = state.current_shape() {
-        shape.set_constraint_h(ConstraintH::from(constraint))
-    }
+    with_current_shape!(state, |shape: &mut Shape| {
+        shape.set_constraint_h(ConstraintH::from(constraint));
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn set_shape_constraint_v(constraint: u8) {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    if let Some(shape) = state.current_shape() {
-        shape.set_constraint_v(ConstraintV::from(constraint))
-    }
+    with_current_shape!(state, |shape: &mut Shape| {
+        shape.set_constraint_v(ConstraintV::from(constraint));
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn set_shape_hidden(hidden: bool) {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         shape.set_hidden(hidden);
-    }
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn set_shape_blur(blur_type: u8, hidden: bool, value: f32) {
-    let state = unsafe { STATE.as_mut() }.expect("got an invalid state pointer");
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         shape.set_blur(blur_type, hidden, value);
-    }
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn set_shape_path_content() {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         let bytes = mem::bytes();
         let raw_segments = bytes
             .chunks(size_of::<shapes::RawPathData>())
@@ -419,48 +427,44 @@ pub extern "C" fn set_shape_path_content() {
             })
             .collect();
         shape.set_path_segments(raw_segments).unwrap();
-    }
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn add_shape_center_stroke(width: f32, style: u8, cap_start: u8, cap_end: u8) {
-    let state = unsafe { STATE.as_mut() }.expect("got an invalid state pointer");
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         shape.add_stroke(shapes::Stroke::new_center_stroke(
             width, style, cap_start, cap_end,
         ));
-    }
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn add_shape_inner_stroke(width: f32, style: u8, cap_start: u8, cap_end: u8) {
-    let state = unsafe { STATE.as_mut() }.expect("got an invalid state pointer");
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         shape.add_stroke(shapes::Stroke::new_inner_stroke(
             width, style, cap_start, cap_end,
-        ))
-    }
+        ));
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn add_shape_outer_stroke(width: f32, style: u8, cap_start: u8, cap_end: u8) {
-    let state = unsafe { STATE.as_mut() }.expect("got an invalid state pointer");
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         shape.add_stroke(shapes::Stroke::new_outer_stroke(
             width, style, cap_start, cap_end,
-        ))
-    }
+        ));
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn add_shape_stroke_solid_fill(raw_color: u32) {
-    let state = unsafe { STATE.as_mut() }.expect("got an invalid state pointer");
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         let color = skia::Color::new(raw_color);
         shape
             .set_stroke_fill(shapes::Fill::Solid(color))
             .expect("could not add stroke solid fill");
-    }
+    });
 }
 
 #[no_mangle]
@@ -471,8 +475,7 @@ pub extern "C" fn add_shape_stroke_linear_fill(
     end_y: f32,
     opacity: f32,
 ) {
-    let state = unsafe { STATE.as_mut() }.expect("got an invalid state pointer");
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         shape
             .set_stroke_fill(shapes::Fill::new_linear_gradient(
                 (start_x, start_y),
@@ -480,7 +483,7 @@ pub extern "C" fn add_shape_stroke_linear_fill(
                 opacity,
             ))
             .expect("could not add stroke linear fill");
-    }
+    });
 }
 
 #[no_mangle]
@@ -492,8 +495,7 @@ pub extern "C" fn add_shape_stroke_radial_fill(
     opacity: f32,
     width: f32,
 ) {
-    let state = unsafe { STATE.as_mut() }.expect("got an invalid state pointer");
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         shape
             .set_stroke_fill(shapes::Fill::new_radial_gradient(
                 (start_x, start_y),
@@ -502,7 +504,7 @@ pub extern "C" fn add_shape_stroke_radial_fill(
                 width,
             ))
             .expect("could not add stroke radial fill");
-    }
+    });
 }
 
 #[no_mangle]
@@ -514,13 +516,12 @@ pub extern "C" fn add_shape_stroke_stops() {
         .map(|data| shapes::RawStopData::from_bytes(data.try_into().unwrap()))
         .collect();
 
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         shape
             .add_stroke_gradient_stops(entries)
             .expect("could not add gradient stops");
-    }
+    });
+
     mem::free_bytes();
 }
 
@@ -552,9 +553,8 @@ pub extern "C" fn add_shape_image_stroke(
     width: i32,
     height: i32,
 ) {
-    let state = unsafe { STATE.as_mut() }.expect("got an invalid state pointer");
-    let id = uuid_from_u32_quartet(a, b, c, d);
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
+        let id = uuid_from_u32_quartet(a, b, c, d);
         shape
             .set_stroke_fill(shapes::Fill::new_image_fill(
                 id,
@@ -562,30 +562,26 @@ pub extern "C" fn add_shape_image_stroke(
                 (width, height),
             ))
             .expect("could not add stroke image fill");
-    }
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn clear_shape_strokes() {
-    let state = unsafe { STATE.as_mut() }.expect("got an invalid state pointer");
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         shape.clear_strokes();
-    }
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn set_shape_corners(r1: f32, r2: f32, r3: f32, r4: f32) {
-    let state = unsafe { STATE.as_mut() }.expect("got an invalid state pointer");
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         shape.set_corners((r1, r2, r3, r4));
-    }
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn set_shape_path_attrs(num_attrs: u32) {
-    let state = unsafe { STATE.as_mut() }.expect("Got an invalid state pointer");
-
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         let bytes = mem::bytes();
         let mut start = 0;
         for _ in 0..num_attrs {
@@ -593,7 +589,7 @@ pub extern "C" fn set_shape_path_attrs(num_attrs: u32) {
             let value = extract_string(&mut start, &bytes);
             shape.set_path_attr(name, value);
         }
-    }
+    });
 }
 
 #[no_mangle]
@@ -632,7 +628,7 @@ pub extern "C" fn set_modifiers() {
     for entry in entries {
         state.modifiers.insert(entry.id, entry.transform);
     }
-    state.render_state.clear_cache();
+    state.render_state().clear_cache();
 }
 
 #[no_mangle]
@@ -645,21 +641,19 @@ pub extern "C" fn add_shape_shadow(
     raw_style: u8,
     hidden: bool,
 ) {
-    let state = unsafe { STATE.as_mut() }.expect("got an invalid state pointer");
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         let color = skia::Color::new(raw_color);
         let style = shapes::ShadowStyle::from(raw_style);
         let shadow = shapes::Shadow::new(color, blur, spread, (x, y), style, hidden);
         shape.add_shadow(shadow);
-    }
+    });
 }
 
 #[no_mangle]
 pub extern "C" fn clear_shape_shadows() {
-    let state = unsafe { STATE.as_mut() }.expect("got an invalid state pointer");
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         shape.clear_shadows();
-    }
+    });
 }
 
 #[no_mangle]
@@ -684,8 +678,7 @@ pub extern "C" fn set_flex_layout_data(
     let justify_content = shapes::JustifyContent::from_u8(justify_content);
     let wrap_type = shapes::WrapType::from_u8(wrap_type);
 
-    let state = unsafe { STATE.as_mut() }.expect("got an invalid state pointer");
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         shape.set_flex_layout_data(
             dir,
             row_gap,
@@ -700,7 +693,7 @@ pub extern "C" fn set_flex_layout_data(
             padding_bottom,
             padding_left,
         );
-    }
+    });
 }
 
 #[no_mangle]
@@ -729,8 +722,7 @@ pub extern "C" fn set_layout_child_data(
     let max_w = if has_max_w { Some(max_w) } else { None };
     let min_w = if has_min_w { Some(min_w) } else { None };
 
-    let state = unsafe { STATE.as_mut() }.expect("got an invalid state pointer");
-    if let Some(shape) = state.current_shape() {
+    with_current_shape!(state, |shape: &mut Shape| {
         shape.set_flex_layout_child_data(
             margin_top,
             margin_right,
@@ -745,7 +737,7 @@ pub extern "C" fn set_layout_child_data(
             is_absolute,
             z_index,
         );
-    }
+    });
 }
 
 #[no_mangle]

render-wasm/src/mem.rs

@@ -1,47 +1,57 @@
-static mut BUFFERU8: Option<Box<Vec<u8>>> = None;
+use std::sync::Mutex;
+
+static BUFFERU8: Mutex<Option<Box<Vec<u8>>>> = Mutex::new(None);
 
 #[no_mangle]
 pub extern "C" fn alloc_bytes(len: usize) -> *mut u8 {
-    // TODO: Figure out how to deal with Result<T> from Emscripten
-    if unsafe { BUFFERU8.is_some() } {
+    let mut guard = BUFFERU8.lock().unwrap();
+
+    if guard.is_some() {
         panic!("Bytes already allocated");
     }
 
-    let mut buffer = Box::new(vec![0u8; len]);
-    let ptr = buffer.as_mut_ptr();
+    let mut new_buffer = Box::new(vec![0u8; len]);
+    let ptr = new_buffer.as_mut_ptr();
 
-    unsafe { BUFFERU8 = Some(buffer) };
-    return ptr;
+    *guard = Some(new_buffer);
+    ptr
 }
 
 pub fn write_bytes(bytes: Vec<u8>) -> *mut u8 {
-    if unsafe { BUFFERU8.is_some() } {
+    let mut guard = BUFFERU8.lock().unwrap();
+
+    if guard.is_some() {
         panic!("Bytes already allocated");
     }
 
-    let mut buffer = Box::new(bytes);
-    let ptr = buffer.as_mut_ptr();
+    let mut new_buffer = Box::new(bytes);
+    let ptr = new_buffer.as_mut_ptr();
 
-    unsafe { BUFFERU8 = Some(buffer) };
-    return ptr;
+    *guard = Some(new_buffer);
+    ptr
 }
 
 #[no_mangle]
 pub extern "C" fn free_bytes() {
-    if unsafe { BUFFERU8.is_some() } {
-        let buffer = unsafe { BUFFERU8.take() }.expect("uninitialized buffer");
-        std::mem::drop(buffer);
-    }
+    let mut guard = BUFFERU8.lock().unwrap();
+    *guard = None;
+    std::mem::drop(guard);
 }
 
 pub fn buffer_ptr() -> *mut u8 {
-    let buffer = unsafe { BUFFERU8.as_mut() }.expect("uninitializied buffer");
-    buffer.as_mut_ptr()
+    let guard = BUFFERU8.lock().unwrap();
+
+    guard
+        .as_ref()
+        .map_or(std::ptr::null_mut(), |buffer| buffer.as_ptr() as *mut u8)
 }
 
 pub fn bytes() -> Vec<u8> {
-    let buffer = unsafe { BUFFERU8.take() }.expect("uninitialized buffer");
-    *buffer
+    let mut guard = BUFFERU8.lock().unwrap();
+
+    guard
+        .take()
+        .map_or_else(|| panic!("Buffer is not initialized"), |buffer| *buffer)
 }
 
 pub trait SerializableResult {

render-wasm/src/render.rs

@@ -458,7 +458,7 @@ impl RenderState {
         if self
             .cached_surface_image
             .as_ref()
-            .map_or(true, |img| img.invalid)
+            .is_none_or(|img| img.invalid)
         {
             self.cached_surface_image = Some(CachedSurfaceImage {
                 image: self.surfaces.snapshot(SurfaceId::Current),

render-wasm/src/state.rs

@@ -59,12 +59,11 @@ impl<'a> State<'a> {
             let new_shape = Shape::new(id);
             self.shapes.insert(id, new_shape);
         }
-
         self.current_id = Some(id);
         self.current_shape = self.shapes.get_mut(&id);
     }
 
-    pub fn current_shape(&'a mut self) -> Option<&'a mut Shape> {
+    pub fn current_shape(&mut self) -> Option<&mut Shape> {
         self.current_shape.as_deref_mut()
     }