darkly 0.5.0

A GPU-native paint engine on wgpu: brushes, layers, blend modes, masks, selections, and undo.
Documentation 
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//! Layer / group / node property mutations (all fire-and-forget).

use serde::Deserialize;

use crate::engine::protocol::{bad_payload, RequestRegistration, Response};
use crate::layer::LayerId;

pub fn registrations() -> Vec<RequestRegistration> {
    vec![
        RequestRegistration {
            kind: "set_opacity",
            handle: |engine, payload, _b| {
                #[derive(Deserialize)]
                struct Req {
                    id: u64,
                    opacity: f32,
                }
                let r: Req = serde_json::from_value(payload).map_err(bad_payload)?;
                engine.set_opacity(LayerId::from_ffi(r.id), r.opacity);
                Ok(Response::empty())
            },
        },
        RequestRegistration {
            kind: "set_blend_mode",
            handle: |engine, payload, _b| {
                #[derive(Deserialize)]
                struct Req {
                    id: u64,
                    type_id: String,
                }
                let r: Req = serde_json::from_value(payload).map_err(bad_payload)?;
                engine.set_blend_mode(LayerId::from_ffi(r.id), &r.type_id);
                Ok(Response::empty())
            },
        },
        RequestRegistration {
            kind: "set_layer_visible",
            handle: |engine, payload, _b| {
                #[derive(Deserialize)]
                struct Req {
                    id: u64,
                    visible: bool,
                }
                let r: Req = serde_json::from_value(payload).map_err(bad_payload)?;
                engine.set_layer_visible(LayerId::from_ffi(r.id), r.visible);
                Ok(Response::empty())
            },
        },
        RequestRegistration {
            kind: "set_layer_name",
            handle: |engine, payload, _b| {
                #[derive(Deserialize)]
                struct Req {
                    id: u64,
                    name: String,
                }
                let r: Req = serde_json::from_value(payload).map_err(bad_payload)?;
                engine.set_layer_name(LayerId::from_ffi(r.id), &r.name);
                Ok(Response::empty())
            },
        },
        RequestRegistration {
            kind: "set_group_collapsed",
            handle: |engine, payload, _b| {
                #[derive(Deserialize)]
                struct Req {
                    id: u64,
                    collapsed: bool,
                }
                let r: Req = serde_json::from_value(payload).map_err(bad_payload)?;
                engine.set_group_collapsed(LayerId::from_ffi(r.id), r.collapsed);
                Ok(Response::empty())
            },
        },
        RequestRegistration {
            kind: "set_group_passthrough",
            handle: |engine, payload, _b| {
                #[derive(Deserialize)]
                struct Req {
                    id: u64,
                    passthrough: bool,
                }
                let r: Req = serde_json::from_value(payload).map_err(bad_payload)?;
                engine.set_group_passthrough(LayerId::from_ffi(r.id), r.passthrough);
                Ok(Response::empty())
            },
        },
        RequestRegistration {
            kind: "set_node_locked",
            handle: |engine, payload, _b| {
                #[derive(Deserialize)]
                struct Req {
                    id: u64,
                    locked: bool,
                }
                let r: Req = serde_json::from_value(payload).map_err(bad_payload)?;
                engine.set_node_locked(LayerId::from_ffi(r.id), r.locked);
                Ok(Response::empty())
            },
        },
        RequestRegistration {
            kind: "set_isolated_node",
            handle: |engine, payload, _b| {
                // `id == 0` is the JS-side sentinel for "clear isolation".
                #[derive(Deserialize)]
                struct Req {
                    id: u64,
                }
                let r: Req = serde_json::from_value(payload).map_err(bad_payload)?;
                let target = (r.id != 0).then(|| LayerId::from_ffi(r.id));
                engine.set_isolated_node(target);
                Ok(Response::empty())
            },
        },
    ]
}