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🐛 Use extrect to capture component's thumbnail

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This commit is contained in:
Elena Torro 2026-05-11 17:18:18 +02:00
parent 847d55bfb4
commit 76e3df5836
3 changed files with 40 additions and 2 deletions
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5
frontend/src/app/main/data/workspace/thumbnails_wasm.cljs
View File

@ -63,8 +63,9 @@
(try
(let [objects (dsh/lookup-page-objects @st/state file-id page-id)]
(if-let [frame (get objects frame-id)]
(let [{:keys [width height]} (:selrect frame)
max-size (mth/max width height)
(let [{ext-w :width ext-h :height} (wasm.api/get-shape-extrect frame-id)
{sel-w :width sel-h :height} (:selrect frame)
max-size (mth/max (or ext-w sel-w) (or ext-h sel-h))
scale (mth/max 1 (/ target-size max-size))
png-bytes (wasm.api/render-shape-pixels frame-id scale)]
(if (or (nil? png-bytes) (zero? (.-length png-bytes)))

18
frontend/src/app/render_wasm/api.cljs
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@ -2172,6 +2172,24 @@
(mem/free)
result))
(defn get-shape-extrect
[shape-id]
(let [buffer (uuid/get-u32 shape-id)
offset (h/call wasm/internal-module "_get_shape_extrect"
(aget buffer 0)
(aget buffer 1)
(aget buffer 2)
(aget buffer 3))]
(when (and (number? offset) (pos? offset))
(let [heapf32 (mem/get-heap-f32)
base (mem/->offset-32 offset)
x (aget heapf32 base)
y (aget heapf32 (+ base 1))
w (aget heapf32 (+ base 2))
h (aget heapf32 (+ base 3))]
(mem/free)
{:x x :y y :width w :height h}))))
(defn init-wasm-module
[module]
(let [default-fn (unchecked-get module "default")

19
render-wasm/src/main.rs
View File

@ -878,6 +878,25 @@ pub extern "C" fn end_temp_objects() -> Result<()> {
Ok(())
}
#[no_mangle]
#[wasm_error]
pub extern "C" fn get_shape_extrect(a: u32, b: u32, c: u32, d: u32) -> Result<*mut u8> {
let id = uuid_from_u32_quartet(a, b, c, d);
with_state!(state, {
let Some(shape) = state.shapes.get(&id) else {
return Err(Error::CriticalError("Shape not found".to_string()));
};
let extrect = get_render_state().get_cached_extrect(shape, &state.shapes, 1.0);
let mut buf = Vec::with_capacity(16);
buf.extend_from_slice(&extrect.x().to_le_bytes());
buf.extend_from_slice(&extrect.y().to_le_bytes());
buf.extend_from_slice(&extrect.width().to_le_bytes());
buf.extend_from_slice(&extrect.height().to_le_bytes());
Ok(mem::write_bytes(buf))
})
}
#[no_mangle]
#[wasm_error]
pub extern "C" fn render_shape_pixels(