darkly 0.5.0

A GPU-native paint engine on wgpu: brushes, layers, blend modes, masks, selections, and undo.
Documentation 
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//! Brush / node preview rendering — node thumbnails, stroke / dab previews, and
//! the live cursor-preview pose. All image responses are PNG bytes on the binary
//! side-channel; the cursor-preview info is a small JSON envelope.

use serde::Deserialize;

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

/// Encode the active cursor-preview info (or `null` when absent).
fn preview_info(engine: &crate::engine::DarklyEngine) -> serde_json::Value {
    match engine.brush_cursor_preview_info() {
        Some(info) => serde_json::json!({ "halfExtent": info.half_extent_canvas_px }),
        None => serde_json::Value::Null,
    }
}

pub fn registrations() -> Vec<RequestRegistration> {
    vec![
        RequestRegistration {
            kind: "node_thumbnail",
            handle: |engine, payload, _b| {
                #[derive(Deserialize)]
                struct Req {
                    node_id: u64,
                    width: u32,
                    height: u32,
                }
                let r: Req = decode(payload)?;
                let bytes = engine.node_thumbnail(LayerId::from_ffi(r.node_id), r.width, r.height);
                Ok(Response::binary(serde_json::Value::Null, bytes))
            },
        },
        RequestRegistration {
            kind: "brush_stroke_preview",
            handle: |engine, _payload, _b| {
                Ok(Response::binary(
                    serde_json::Value::Null,
                    engine.brush_stroke_preview(),
                ))
            },
        },
        RequestRegistration {
            kind: "brush_active_dab_preview",
            handle: |engine, _payload, _b| {
                Ok(Response::binary(
                    serde_json::Value::Null,
                    engine.brush_active_dab_preview(),
                ))
            },
        },
        RequestRegistration {
            kind: "brush_node_preview",
            handle: |engine, payload, _b| {
                #[derive(Deserialize)]
                struct Req {
                    node_id: u64,
                }
                let r: Req = decode(payload)?;
                Ok(Response::binary(
                    serde_json::Value::Null,
                    engine.brush_node_preview(r.node_id),
                ))
            },
        },
        RequestRegistration {
            kind: "brush_thumbnail",
            handle: |engine, payload, _b| {
                #[derive(Deserialize)]
                struct Req {
                    name: String,
                }
                let r: Req = decode(payload)?;
                Ok(Response::binary(
                    serde_json::Value::Null,
                    engine.brush_thumbnail(&r.name),
                ))
            },
        },
        RequestRegistration {
            kind: "brush_dab_thumbnail",
            handle: |engine, payload, _b| {
                #[derive(Deserialize)]
                struct Req {
                    name: String,
                }
                let r: Req = decode(payload)?;
                Ok(Response::binary(
                    serde_json::Value::Null,
                    engine.brush_dab_thumbnail(&r.name),
                ))
            },
        },
        RequestRegistration {
            kind: "clear_brush_cursor_preview_pose",
            handle: |engine, _payload, _b| {
                engine.clear_brush_cursor_preview_pose();
                Ok(Response::empty())
            },
        },
        RequestRegistration {
            kind: "get_brush_cursor_preview_info",
            handle: |engine, _payload, _b| Ok(Response::json(preview_info(engine))),
        },
        RequestRegistration {
            kind: "refresh_brush_cursor_preview",
            handle: |engine, payload, _b| {
                #[derive(Deserialize)]
                struct Req {
                    x: f32,
                    y: f32,
                    pressure: f32,
                    tilt_x: f32,
                    tilt_y: f32,
                    rotation: f32,
                    tangential_pressure: f32,
                }
                let r: Req = decode(payload)?;
                let mut pen = crate::brush::paint_info::PaintInformation::cursor_preview_dummy();
                pen.pos = [r.x, r.y];
                if r.pressure > 0.0 {
                    pen.pressure = r.pressure;
                }
                pen.x_tilt = r.tilt_x;
                pen.y_tilt = r.tilt_y;
                pen.rotation = r.rotation;
                pen.tangential_pressure = r.tangential_pressure;
                engine.regenerate_brush_cursor_preview_with_pen(pen);
                Ok(Response::json(preview_info(engine)))
            },
        },
    ]
}