darkly 0.5.0

A GPU-native paint engine on wgpu: brushes, layers, blend modes, masks, selections, and undo.
Documentation 
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//! Veils (viewport post-process effects): list, mutate, and preview.

use serde::Deserialize;

use crate::engine::protocol::{decode, params_from_json, RequestRegistration, Response};

pub fn registrations() -> Vec<RequestRegistration> {
    vec![
        RequestRegistration {
            kind: "remove_veil",
            handle: |engine, payload, _b| {
                #[derive(Deserialize)]
                struct Req {
                    index: usize,
                }
                let r: Req = decode(payload)?;
                engine.remove_veil(r.index);
                Ok(Response::empty())
            },
        },
        RequestRegistration {
            kind: "clear_veils",
            handle: |engine, _payload, _b| {
                engine.clear_veils();
                Ok(Response::empty())
            },
        },
        RequestRegistration {
            kind: "set_veil_visible",
            handle: |engine, payload, _b| {
                #[derive(Deserialize)]
                struct Req {
                    index: usize,
                    visible: bool,
                }
                let r: Req = decode(payload)?;
                engine.set_veil_visible(r.index, r.visible);
                Ok(Response::empty())
            },
        },
        RequestRegistration {
            kind: "move_veil",
            handle: |engine, payload, _b| {
                #[derive(Deserialize)]
                struct Req {
                    from: usize,
                    to: usize,
                }
                let r: Req = decode(payload)?;
                engine.move_veil(r.from, r.to);
                Ok(Response::empty())
            },
        },
        RequestRegistration {
            kind: "add_veil",
            handle: |engine, payload, _b| {
                #[derive(Deserialize)]
                struct Req {
                    veil_type: String,
                    #[serde(default)]
                    params: serde_json::Value,
                }
                let r: Req = decode(payload)?;
                let pv = params_from_json(&r.params, engine.veil_param_defs(&r.veil_type));
                engine.add_veil(&r.veil_type, &pv);
                Ok(Response::empty())
            },
        },
        RequestRegistration {
            kind: "update_veil",
            handle: |engine, payload, _b| {
                #[derive(Deserialize)]
                struct Req {
                    index: usize,
                    #[serde(default)]
                    params: serde_json::Value,
                }
                let r: Req = decode(payload)?;
                // Resolve the veil's type id from its slot so we coerce params
                // against the right schema.
                let type_id = match engine.veil_list().iter().find(|v| v.index == r.index) {
                    Some(v) => v.type_id.clone(),
                    None => return Ok(Response::empty()),
                };
                let pv = params_from_json(&r.params, engine.veil_param_defs(&type_id));
                engine.update_veil(r.index, &pv);
                Ok(Response::empty())
            },
        },
    ]
}