add sla .ctb format and a few related printer targets

bin/ctb2rsla.mjs

@@ -0,0 +1,39 @@
+#!/usr/bin/env node
+
+import fs from 'fs/promises';
+import path from 'path';
+import { CTB } from '../src/kiri/mode/sla/work/x_ctb.js';
+
+let [,, input, output] = process.argv;
+
+if (!input) {
+    console.error("usage: node bin/ctb2rsla.mjs input.ctb [output.rsla]");
+    process.exit(1);
+}
+
+output = output || input.replace(/\.ctb$/i, "") + ".rsla";
+
+let data = await fs.readFile(input);
+let ctb = CTB.read(data);
+let { header, machine } = ctb;
+let lastPercent = -1;
+
+console.log([
+    "ctb",
+    machine || "unknown-machine",
+    `${header.resolutionX}x${header.resolutionY}`,
+    `${header.layerCount} layers`,
+    `${path.basename(output)}`
+].join(" "));
+
+let file = await CTB.toRSLA(data, (progress, message) => {
+    let percent = Math.floor(progress * 100);
+    if (percent !== lastPercent) {
+        lastPercent = percent;
+        process.stderr.write(`\r${message} ${percent}%`);
+    }
+});
+
+if (lastPercent >= 0) process.stderr.write("\n");
+await fs.writeFile(output, Buffer.from(file));
+console.log(`wrote ${output}`);

src/kiri/app/conf/defaults.js

@@ -102,6 +102,7 @@ function device_from_code(code,mode) {
         slaFormat: valueOf(set.sla_format, ''),
         slaFileExt: valueOf(set.sla_file_ext, ''),
         slaFormatVersion: valueOf(set.sla_format_version, 1),
+        slaMachineEditable: valueOf(set.sla_machine_editable, false),
         deviceZMax: valueOf(set.z_move_max, 0),
         gcodeTime: valueOf(set.time_factor, 1),
         maxHeight: valueOf(set.build_height, 150),
@@ -373,7 +374,8 @@ export const conf = {
                 resolutionY: 900,
                 slaFormat: "",
                 slaFileExt: "",
-                slaFormatVersion: 1
+                slaFormatVersion: 1,
+                slaMachineEditable: false
             },
             // process defaults SLA:Process
             p:{

src/kiri/app/devices.js

@@ -3,6 +3,7 @@
 import { $, h } from '../../moto/webui.js';
 import { api } from './api.js';
 import { conf } from './conf/defaults.js';
+import { canEditSLAMachine } from '../mode/sla/core/formats.js';
 import { space } from '../../moto/space.js';
 import { devices as devlist } from '../../pack/kiri-devs.js';
 import { settings, conf as setconf } from './conf/manager.js';
@@ -185,7 +186,7 @@ function setDeviceCode(code, devicename) {
             }
         }
 
-        let allowSLADeviceEdit = mode !== 'SLA' || dev.slaFormat === 'vsla' || dev.slaFormat === 'rsla';
+        let allowSLADeviceEdit = mode !== 'SLA' || canEditSLAMachine(dev);
 
         // disable editing for non-local devices
         [

src/kiri/dev/sla/Any.Generic.Chitubox.CTB.json

@@ -0,0 +1,16 @@
+{
+    "no_clone": false,
+    "cmd": {},
+    "settings": {
+        "bed_width": 192,
+        "bed_depth": 120,
+        "bed_height": 1,
+        "max_height": 250,
+        "resolution_x": 3840,
+        "resolution_y": 2400,
+        "sla_format": "ctb",
+        "sla_file_ext": "ctb",
+        "sla_format_version": 3,
+        "sla_machine_editable": true
+    }
+}

src/kiri/dev/sla/Creality.LD-006.json

@@ -0,0 +1,15 @@
+{
+    "no_clone": true,
+    "cmd": {},
+    "settings": {
+        "bed_width": 192,
+        "bed_depth": 120,
+        "bed_height": 1,
+        "max_height": 250,
+        "resolution_x": 3840,
+        "resolution_y": 2400,
+        "sla_format": "ctb",
+        "sla_file_ext": "ctb",
+        "sla_format_version": 3
+    }
+}

src/kiri/dev/sla/Elegoo.Mars.3.CTB.json

@@ -0,0 +1,15 @@
+{
+    "no_clone": true,
+    "cmd": {},
+    "settings": {
+        "bed_width": 143,
+        "bed_depth": 89.6,
+        "bed_height": 1,
+        "max_height": 175,
+        "resolution_x": 4098,
+        "resolution_y": 2560,
+        "sla_format": "ctb",
+        "sla_file_ext": "ctb",
+        "sla_format_version": 3
+    }
+}

src/kiri/dev/sla/Elegoo.Saturn.2.CTB.json

@@ -0,0 +1,15 @@
+{
+    "no_clone": true,
+    "cmd": {},
+    "settings": {
+        "bed_width": 218.88,
+        "bed_depth": 123.12,
+        "bed_height": 1,
+        "max_height": 250,
+        "resolution_x": 7680,
+        "resolution_y": 4320,
+        "sla_format": "ctb",
+        "sla_file_ext": "ctb",
+        "sla_format_version": 3
+    }
+}

src/kiri/mode/sla/app/init-ui.js

@@ -2,6 +2,7 @@
 
 import { $ } from '../../../../moto/webui.js';
 import { api } from '../../../app/api.js';
+import { getSLAFileExt } from '../core/formats.js';
 
 export const SLA = {
     init,
@@ -63,11 +64,7 @@ export function printDownload(output, api, names) {
     $('print-layers').value = layers;
     $('print-time').value = `${print_hrs}:${print_min}:${print_sec}`;
 
-    let ext = device.slaFileExt || ({
+    let ext = getSLAFileExt(device);
-        'Anycubic.Photon': 'photon',
-        'Anycubic.Photon.S': 'photons'
-    }[device.deviceName]) || 'cxdlp';
-
     ext = ext.startsWith(".") ? ext : `.${ext}`;
     download.innerText = `${api.language.current.ex_dwnl || 'download'} ${ext}`;
     download.onclick = () => { saveFile(api, file, ext) };

src/kiri/mode/sla/core/formats.js

@@ -0,0 +1,68 @@
+/** Copyright Stewart Allen <sa@grid.space> -- All Rights Reserved */
+
+const DEVICE_FORMAT = {
+    'Anycubic.Photon': 'photon',
+    'Anycubic.Photon.S': 'photons'
+};
+
+export const SLA_FORMATS = {
+    photon: {
+        id: 'photon',
+        ext: 'photon',
+        proprietary: true,
+        available: true
+    },
+    photons: {
+        id: 'photons',
+        ext: 'photons',
+        proprietary: true,
+        available: true
+    },
+    cxdlp: {
+        id: 'cxdlp',
+        ext: 'cxdlp',
+        proprietary: true,
+        available: true
+    },
+    vsla: {
+        id: 'vsla',
+        ext: 'vsla',
+        proprietary: false,
+        available: true,
+        editableMachine: true
+    },
+    rsla: {
+        id: 'rsla',
+        ext: 'rsla',
+        proprietary: false,
+        available: true,
+        editableMachine: true
+    },
+    ctb: {
+        id: 'ctb',
+        ext: 'ctb',
+        proprietary: true,
+        available: true,
+        priority: 1,
+        family: 'chitubox'
+    }
+};
+
+export function getSLAFormat(device) {
+    return device.slaFormat || DEVICE_FORMAT[device.deviceName] || 'cxdlp';
+}
+
+export function getSLAFormatRecord(device) {
+    let id = getSLAFormat(device);
+    return SLA_FORMATS[id] || SLA_FORMATS.cxdlp;
+}
+
+export function getSLAFileExt(device) {
+    let rec = getSLAFormatRecord(device);
+    return device.slaFileExt || rec.ext || rec.id;
+}
+
+export function canEditSLAMachine(device) {
+    return device.slaMachineEditable === true ||
+        getSLAFormatRecord(device).editableMachine === true;
+}

src/kiri/mode/sla/work/export.js

@@ -1,10 +1,12 @@
 /** Copyright Stewart Allen <sa@grid.space> -- All Rights Reserved */
 
 import { CXDLP } from './x_cxdlp.js';
+import { CTB } from './x_ctb.js';
 import { photon } from './x_photon.js';
 import { SLA } from './init-work.js';
 import { RSLA } from './x_rsla.js';
 import { VSLA } from './x_vsla.js';
+import { getSLAFormat } from '../core/formats.js';
 
 /**
  * DRIVER CONTRACT - runs in worker
@@ -35,10 +37,7 @@ export function sla_export(print, online, ondone) {
         layermax = Math.max(widget.slices.length);
     });
 
-    let format = device.slaFormat || ({
+    let format = getSLAFormat(device);
-        'Anycubic.Photon': 'photon',
-        'Anycubic.Photon.S': 'photons',
-    }[device.deviceName]) || 'cxdlp';
 
     if (format === 'vsla') {
         return VSLA.encode(print, (progress, message) => {
@@ -58,6 +57,15 @@ export function sla_export(print, online, ondone) {
         });
     }
 
+    if (format === 'ctb') {
+        return CTB.encode(print, (progress, message) => {
+            online({ progress, message });
+        }, photon).then(output => {
+            let { file, layers, volume } = output;
+            ondone({ width, height, file, layers, volume }, [file]);
+        });
+    }
+
     if (format === 'photon' || format === 'photons') {
         let legacyMode = SLA.legacy || alias > 1,
             part1 = legacyMode ? 0.25 : 0.85,

src/kiri/mode/sla/work/x_ctb.js

@@ -0,0 +1,750 @@
+/** Copyright Stewart Allen <sa@grid.space> -- All Rights Reserved */
+
+import { JSZip } from '../../../../ext/jszip-esm.js';
+import { PNG } from '../../../../ext/pngjs.esm.js';
+
+const CTB_V3_MAGIC = 0x12fd0086;
+const HEADER_SIZE = 0x70;
+const LAYER_TABLE_RECORD_SIZE = 36;
+const LAYER_FULL_RECORD_SIZE = 84;
+const PRINT_PARAMS_SIZE = 60;
+const MACHINE_INFO_SIZE = 76;
+const RSLA_MIME = "application/vnd.gridspace.rsla+zip";
+
+function encode(print, progress, renderer) {
+    if (renderer) {
+        return Promise.resolve(encodeWithPhoton(print, progress, renderer));
+    }
+    return import('./x_photon.js').then(({ photon }) =>
+        encodeWithPhoton(print, progress, photon));
+}
+
+function encodeWithPhoton(print, progress, photon) {
+    let { settings, widgets } = print;
+    let { device, process } = settings;
+    let width = device.resolutionX;
+    let height = device.resolutionY;
+    let scaleX = width / device.bedWidth;
+    let scaleY = height / device.bedDepth;
+    let layermax = 0;
+    let layers = [];
+    let volume = 0;
+    let seed = makeSeed(print);
+
+    widgets = widgets.filter(w => !w.track.ignore && !w.meta.disabled);
+    widgets.forEach(widget => {
+        layermax = Math.max(layermax, widget.slices.length);
+    });
+
+    for (let index=0; index<layermax; index++) {
+        let rendered = photon.renderLayerWasm({
+            index,
+            width,
+            height,
+            widgets,
+            scaleX,
+            scaleY,
+            masks: []
+        });
+        if (rendered.end) {
+            break;
+        }
+
+        let pixels = renderToCTBPixels(rendered.image, width, height);
+        let encoded = encipher(seed, index, encodeRLE(pixels));
+        let bottom = index < process.slaBaseLayers;
+
+        volume += rendered.area * process.slaSlice;
+        layers.push({
+            index,
+            z: process.slaFirstOffset + process.slaSlice * (index + 1),
+            exposure: bottom ? process.slaBaseOn : process.slaLayerOn,
+            lightOffDelay: bottom ? process.slaBaseOff : process.slaLayerOff,
+            liftDistance: bottom ? process.slaBasePeelDist : process.slaPeelDist,
+            liftSpeed: (bottom ? process.slaBasePeelLiftRate : process.slaPeelLiftRate) * 60,
+            data: encoded
+        });
+
+        if (progress) progress((index / layermax) * 0.85, "ctb_encode");
+    }
+
+    let file = writeCTB({ device, process, layers, volume, seed });
+    if (progress) progress(1, "ctb_write");
+
+    return { file, layers: layers.length, volume };
+}
+
+function read(input) {
+    let view = input instanceof DataView
+        ? input
+        : new DataView(input.buffer || input, input.byteOffset || 0, input.byteLength);
+
+    let header = readHeader(view);
+    let layers = readLayerTable(view, header);
+
+    return {
+        header,
+        print: readPrintParams(view, header),
+        machine: readMachineName(view, header),
+        layers,
+        layout: inferLayout(header, layers)
+    };
+}
+
+function toRSLA(input, progress) {
+    let view = toDataView(input);
+    let ctb = read(view);
+    let { header, layers } = ctb;
+    let zip = new JSZip();
+    let rslaLayers = [];
+
+    layers.forEach((layer, index) => {
+        let pixels = decodeLayer(view, header, layer);
+        let file = `layers/${index.toString().padStart(6, "0")}.png`;
+        zip.file(file, imageToPNG(pixels, header.resolutionX, header.resolutionY));
+        rslaLayers.push({
+            index,
+            z: round(layer.z),
+            exposure: round(layer.exposure),
+            lightOffDelay: round(layer.lightOffDelay),
+            source: {
+                offset: layer.imageOffset,
+                length: layer.imageLength
+            },
+            file
+        });
+        if (progress) progress((index / layers.length) * 0.85, "ctb_decode");
+    });
+
+    zip.file("manifest.json", JSON.stringify(createRSLAManifest(ctb, rslaLayers), null, 2));
+
+    return zip.generateAsync({
+        type: "arraybuffer",
+        compression: "DEFLATE",
+        compressionOptions: { level: 6 },
+        streamFiles: true,
+        mimeType: RSLA_MIME
+    }, meta => {
+        if (progress) progress(0.85 + (meta.percent / 100) * 0.15, "zip_gen");
+    });
+}
+
+function decodeLayer(view, header, layer) {
+    let data = new Uint8Array(
+        view.buffer,
+        view.byteOffset + layer.imageOffset,
+        layer.imageLength
+    );
+    let decoded = decodeRLE(decipher(header.encryptionSeed, layer.index, data),
+        header.resolutionX * header.resolutionY);
+    return decoded;
+}
+
+function writeCTB(params) {
+    let { device, process, layers, volume, seed } = params;
+    let machine = device.deviceName || "Generic CTB";
+    let machineBytes = new TextEncoder().encode(machine);
+    let printTime = Math.round((process.slaBaseLayers * process.slaBaseOn) +
+        Math.max(0, layers.length - process.slaBaseLayers) * process.slaLayerOn);
+    let printParamsOffset = HEADER_SIZE;
+    let machineInfoOffset = printParamsOffset + PRINT_PARAMS_SIZE;
+    let nameOffset = machineInfoOffset + MACHINE_INFO_SIZE;
+    let layerTableOffset = nameOffset + machineBytes.length;
+    let imageOffset = layerTableOffset + layers.length * LAYER_TABLE_RECORD_SIZE;
+
+    layers.forEach(layer => {
+        layer.fullOffset = imageOffset;
+        layer.imageOffset = imageOffset + LAYER_FULL_RECORD_SIZE;
+        layer.imageLength = layer.data.length;
+        layer.blockLength = LAYER_FULL_RECORD_SIZE + layer.imageLength;
+        imageOffset = layer.imageOffset + layer.imageLength;
+    });
+
+    let buffer = new ArrayBuffer(imageOffset);
+    let writer = new BinaryWriter(buffer);
+
+    writeHeader(writer, {
+        device,
+        process,
+        layers,
+        seed,
+        printTime,
+        printParamsOffset,
+        machineInfoOffset,
+        layerTableOffset
+    });
+    writer.seek(printParamsOffset);
+    writePrintParams(writer, { process, volume });
+    writer.seek(machineInfoOffset);
+    writeMachineInfo(writer, { machineBytes, nameOffset });
+    writer.seek(nameOffset);
+    writer.writeBytes(machineBytes);
+    writer.seek(layerTableOffset);
+    layers.forEach(layer => writeLayerRecord(writer, layer));
+    layers.forEach(layer => {
+        writer.seek(layer.fullOffset);
+        writeFullLayerRecord(writer, layer);
+        writer.writeBytes(layer.data);
+    });
+
+    return buffer;
+}
+
+function writeHeader(writer, params) {
+    let {
+        device, process, layers, seed, printTime,
+        printParamsOffset, machineInfoOffset, layerTableOffset
+    } = params;
+
+    writer.writeU32(CTB_V3_MAGIC);
+    writer.writeU32(3);
+    writer.writeF32(device.bedWidth);
+    writer.writeF32(device.bedDepth);
+    writer.writeF32(device.maxHeight || device.bedHeight);
+    writer.skip(12);
+    writer.writeF32(process.slaSlice);
+    writer.writeF32(process.slaLayerOn);
+    writer.writeF32(process.slaBaseOn);
+    writer.writeF32(process.slaLayerOff);
+    writer.writeU32(process.slaBaseLayers);
+    writer.writeU32(device.resolutionX);
+    writer.writeU32(device.resolutionY);
+    writer.writeU32(0);
+    writer.writeU32(layerTableOffset);
+    writer.writeU32(layers.length);
+    writer.writeU32(0);
+    writer.writeU32(printTime);
+    writer.writeU32(1);
+    writer.writeU32(printParamsOffset);
+    writer.writeU32(PRINT_PARAMS_SIZE);
+    writer.writeU32(process.slaAntiAlias || 1);
+    writer.writeU16(0x00ff);
+    writer.writeU16(0x00ff);
+    writer.writeU32(seed);
+    writer.writeU32(machineInfoOffset);
+    writer.writeU32(MACHINE_INFO_SIZE);
+}
+
+function writePrintParams(writer, params) {
+    let { process, volume } = params;
+
+    writer.writeF32(process.slaBasePeelDist);
+    writer.writeF32(process.slaBasePeelLiftRate * 60);
+    writer.writeF32(process.slaPeelDist);
+    writer.writeF32(process.slaPeelLiftRate * 60);
+    writer.writeF32(process.slaPeelDropRate * 60);
+    writer.writeF32(volume);
+    writer.writeF32(0);
+    writer.writeF32(0);
+    writer.writeF32(process.slaBaseOff);
+    writer.writeF32(process.slaLayerOff);
+    writer.writeU32(process.slaBaseLayers);
+    writer.writeU32(0);
+    writer.writeU32(0);
+    writer.writeU32(0);
+    writer.writeU32(0);
+}
+
+function writeMachineInfo(writer, params) {
+    let { machineBytes, nameOffset } = params;
+
+    writer.skip(0x1c);
+    writer.writeU32(nameOffset);
+    writer.writeU32(machineBytes.length);
+    writer.writeU32(machineBytes.length);
+    writer.writeU32(0x2000000f);
+    writer.writeU32(0x01c45dd1);
+    writer.writeU32(8);
+    writer.writeU32(0x01080000);
+    writer.writeF32(6.8);
+    writer.writeU32(0);
+    writer.writeU32(10);
+    writer.writeU32(0);
+    writer.writeU32(0);
+    writer.writeU32(0);
+}
+
+function writeLayerRecord(writer, layer) {
+    writer.writeF32(layer.z);
+    writer.writeF32(layer.exposure);
+    writer.writeF32(layer.lightOffDelay);
+    writer.writeU32(layer.imageOffset);
+    writer.writeU32(layer.imageLength);
+    writer.writeU32(0);
+    writer.writeU32(LAYER_FULL_RECORD_SIZE);
+    writer.writeU32(0);
+    writer.writeU32(0);
+}
+
+function writeFullLayerRecord(writer, layer) {
+    writeLayerRecord(writer, layer);
+    writer.writeU32(layer.blockLength);
+    writer.writeF32(layer.liftDistance);
+    writer.writeF32(layer.liftSpeed);
+    writer.writeU32(0);
+    writer.writeU32(0);
+    writer.writeU32(0);
+    writer.writeU32(0);
+    writer.writeU32(0);
+    writer.writeU32(0);
+    writer.writeU32(0);
+    writer.writeF32(0);
+    writer.writeF32(0x00ff);
+}
+
+function readHeader(view) {
+    let magic = view.getUint32(0, true);
+    let version = view.getUint32(4, true);
+    if (magic !== CTB_V3_MAGIC) {
+        throw new Error(`invalid CTB magic 0x${magic.toString(16)}`);
+    }
+    if (version !== 3) {
+        throw new Error(`unsupported CTB version ${version}`);
+    }
+
+    return {
+        magic,
+        version,
+        bedWidth: view.getFloat32(0x08, true),
+        bedDepth: view.getFloat32(0x0c, true),
+        bedHeight: view.getFloat32(0x10, true),
+        layerHeight: view.getFloat32(0x20, true),
+        exposure: view.getFloat32(0x24, true),
+        bottomExposure: view.getFloat32(0x28, true),
+        lightOffDelay: view.getFloat32(0x2c, true),
+        bottomLayers: view.getUint32(0x30, true),
+        resolutionX: view.getUint32(0x34, true),
+        resolutionY: view.getUint32(0x38, true),
+        previewOffset: view.getUint32(0x3c, true),
+        layerTableOffset: view.getUint32(0x40, true),
+        layerCount: view.getUint32(0x44, true),
+        previewOneLength: view.getUint32(0x48, true),
+        printParamsOffset: view.getUint32(0x54, true),
+        printParamsLength: view.getUint32(0x58, true),
+        antiAliasLevel: view.getUint32(0x5c, true),
+        lightPWM: view.getUint16(0x60, true),
+        bottomLightPWM: view.getUint16(0x62, true),
+        encryptionSeed: view.getUint32(0x64, true),
+        machineInfoOffset: view.getUint32(0x68, true),
+        machineInfoLength: view.getUint32(0x6c, true)
+    };
+}
+
+function readLayerTable(view, header) {
+    let layers = [];
+    let offset = header.layerTableOffset;
+
+    for (let index=0; index<header.layerCount; index++) {
+        layers.push(readLayerRecord(view, header, offset, index));
+        offset += LAYER_TABLE_RECORD_SIZE;
+    }
+
+    return layers;
+}
+
+function readLayerRecord(view, header, offset, index) {
+    let record = {
+        index,
+        tableOffset: offset,
+        z: view.getFloat32(offset + 0, true),
+        exposure: view.getFloat32(offset + 4, true),
+        lightOffDelay: view.getFloat32(offset + 8, true),
+        imageOffset: view.getUint32(offset + 12, true),
+        imageLength: view.getUint32(offset + 16, true),
+        unknown20: view.getUint32(offset + 20, true),
+        fullRecordLength: view.getUint32(offset + 24, true),
+        unknown28: view.getUint32(offset + 28, true),
+        unknown32: view.getUint32(offset + 32, true)
+    };
+    let fullOffset = record.imageOffset - LAYER_FULL_RECORD_SIZE;
+    if (fullOffset >= header.layerTableOffset) {
+        record.full = readFullLayerRecord(view, fullOffset);
+    }
+    return record;
+}
+
+function readFullLayerRecord(view, offset) {
+    return {
+        offset,
+        z: view.getFloat32(offset + 0, true),
+        exposure: view.getFloat32(offset + 4, true),
+        lightOffDelay: view.getFloat32(offset + 8, true),
+        imageOffset: view.getUint32(offset + 12, true),
+        imageLength: view.getUint32(offset + 16, true),
+        unknown20: view.getUint32(offset + 20, true),
+        fullRecordLength: view.getUint32(offset + 24, true),
+        unknown28: view.getUint32(offset + 28, true),
+        unknown32: view.getUint32(offset + 32, true),
+        blockLength: view.getUint32(offset + 36, true),
+        liftDistance: view.getFloat32(offset + 40, true),
+        liftSpeed: view.getFloat32(offset + 44, true),
+        unknown48: view.getUint32(offset + 48, true),
+        unknown52: view.getUint32(offset + 52, true),
+        unknown56: view.getUint32(offset + 56, true),
+        unknown60: view.getUint32(offset + 60, true),
+        unknown64: view.getUint32(offset + 64, true),
+        unknown68: view.getUint32(offset + 68, true),
+        unknown72: view.getUint32(offset + 72, true),
+        unknown76: view.getFloat32(offset + 76, true),
+        lightPWM: view.getFloat32(offset + 80, true)
+    };
+}
+
+function readPrintParams(view, header) {
+    let offset = header.printParamsOffset;
+    if (!offset || header.printParamsLength < 60) return {};
+
+    return {
+        bottomLiftDistance: view.getFloat32(offset + 0, true),
+        bottomLiftSpeed: view.getFloat32(offset + 4, true),
+        liftDistance: view.getFloat32(offset + 8, true),
+        liftSpeed: view.getFloat32(offset + 12, true),
+        retractSpeed: view.getFloat32(offset + 16, true),
+        volume: view.getFloat32(offset + 20, true),
+        weight: view.getFloat32(offset + 24, true),
+        cost: view.getFloat32(offset + 28, true),
+        bottomLightOffDelay: view.getFloat32(offset + 32, true),
+        lightOffDelay: view.getFloat32(offset + 36, true),
+        bottomLayers: view.getUint32(offset + 40, true),
+        unknown44: view.getUint32(offset + 44, true),
+        unknown48: view.getUint32(offset + 48, true),
+        unknown52: view.getUint32(offset + 52, true),
+        unknown56: view.getUint32(offset + 56, true)
+    };
+}
+
+function readMachineName(view, header) {
+    if (!header.machineInfoOffset || !header.machineInfoLength) return "";
+
+    let nameOffset = view.getUint32(header.machineInfoOffset + 0x1c, true);
+    let nameLength = view.getUint32(header.machineInfoOffset + 0x20, true);
+    if (!nameOffset || !nameLength) return "";
+
+    let chars = [];
+    for (let i=0; i<nameLength; i++) {
+        let c = view.getUint8(nameOffset + i);
+        if (c === 0) break;
+        chars.push(String.fromCharCode(c));
+    }
+    return chars.join("");
+}
+
+function inferLayout(header, layers) {
+    let tableEnd = header.layerTableOffset + header.layerCount * LAYER_TABLE_RECORD_SIZE;
+    let firstLayer = layers[0];
+    let firstFullRecordOffset = firstLayer ? firstLayer.imageOffset - LAYER_FULL_RECORD_SIZE : 0;
+
+    return {
+        headerSize: HEADER_SIZE,
+        layerTableRecordSize: LAYER_TABLE_RECORD_SIZE,
+        layerFullRecordSize: LAYER_FULL_RECORD_SIZE,
+        tableEnd,
+        firstFullRecordOffset,
+        hasFullRecordsBeforeImages: firstFullRecordOffset === tableEnd
+    };
+}
+
+function createRSLAManifest(ctb, layers) {
+    let { header, print, machine } = ctb;
+
+    return {
+        format: "rsla",
+        version: 1,
+        units: "mm",
+        coordinateSystem: {
+            layerImage: "top-left",
+            model: "bed-center",
+            x: "right",
+            y: "back",
+            z: "up"
+        },
+        source: {
+            format: "ctb",
+            version: header.version,
+            machine
+        },
+        bed: {
+            width: round(header.bedWidth),
+            depth: round(header.bedDepth),
+            height: round(header.bedHeight)
+        },
+        resolution: {
+            x: header.resolutionX,
+            y: header.resolutionY
+        },
+        layerHeight: round(header.layerHeight),
+        layerCount: layers.length,
+        raster: {
+            encoding: "png",
+            color: "grayscale",
+            cure: "nonzero",
+            white: "cure",
+            black: "off"
+        },
+        process: {
+            bottomLayers: print.bottomLayers ?? header.bottomLayers,
+            exposure: round(header.exposure),
+            bottomExposure: round(header.bottomExposure),
+            lightOffDelay: round(print.lightOffDelay ?? header.lightOffDelay),
+            bottomLightOffDelay: round(print.bottomLightOffDelay),
+            liftHeight: round(print.liftDistance),
+            bottomLiftHeight: round(print.bottomLiftDistance),
+            liftSpeed: round(print.liftSpeed),
+            bottomLiftSpeed: round(print.bottomLiftSpeed),
+            retractSpeed: round(print.retractSpeed),
+            antiAlias: header.antiAliasLevel,
+            lightPWM: header.lightPWM,
+            bottomLightPWM: header.bottomLightPWM
+        },
+        layers
+    };
+}
+
+function renderToCTBPixels(image, width, height) {
+    let data = new Uint8Array(width * height);
+    for (let x=0; x<width; x++) {
+        for (let y=0; y<height; y++) {
+            data[y * width + x] = image[x * height + y] || 0;
+        }
+    }
+    return data;
+}
+
+function encodeRLE(input) {
+    let output = [];
+    let color = quantize(input[0]);
+    let run = 1;
+
+    for (let offset=1; offset<input.length; offset++) {
+        let next = quantize(input[offset]);
+        if (next === color) {
+            run++;
+            continue;
+        }
+        writeRun(output, color, run);
+        color = next;
+        run = 1;
+    }
+
+    writeRun(output, color, run);
+    return new Uint8Array(output);
+}
+
+function writeRun(output, color, length) {
+    if (length === 1) {
+        output.push(color);
+        return;
+    }
+
+    output.push(color | 0x80);
+    if (length < 0x80) {
+        output.push(length);
+    } else if (length < 0x4000) {
+        output.push(0x80 | (length >> 8), length & 0xff);
+    } else if (length < 0x200000) {
+        output.push(0xc0 | (length >> 16), (length >> 8) & 0xff, length & 0xff);
+    } else if (length < 0x10000000) {
+        output.push(
+            0xe0 | (length >> 24),
+            (length >> 16) & 0xff,
+            (length >> 8) & 0xff,
+            length & 0xff
+        );
+    } else {
+        throw new Error(`CTB RLE run too long (${length})`);
+    }
+}
+
+function quantize(value) {
+    return value ? Math.max(1, Math.min(0x7f, Math.round(value / 2))) : 0;
+}
+
+function decodeRLE(input, pixelCount) {
+    let output = new Uint8Array(pixelCount);
+    let offset = 0;
+    let out = 0;
+
+    while (offset < input.length && out < pixelCount) {
+        let code = input[offset++];
+        let repeat = (code & 0x80) !== 0;
+        code &= 0x7f;
+
+        let stride = repeat ? readRunLength(input, offset) : 1;
+        if (repeat) offset += stride.bytes;
+
+        let value = code === 0 ? 0 : (code << 1) | 1;
+        let end = out + (repeat ? stride.length : stride);
+        if (end > pixelCount) {
+            throw new Error(`CTB RLE overrun in decoded layer (${end} > ${pixelCount})`);
+        }
+        output.fill(value, out, end);
+        out = end;
+    }
+
+    if (out !== pixelCount) {
+        throw new Error(`CTB RLE underrun in decoded layer (${out} < ${pixelCount})`);
+    }
+
+    return output;
+}
+
+function readRunLength(input, offset) {
+    let slen = input[offset];
+    if (slen === undefined) throw new Error("truncated CTB RLE run length");
+
+    if ((slen & 0x80) === 0) {
+        return { length: slen, bytes: 1 };
+    }
+    if ((slen & 0xc0) === 0x80) {
+        requireBytes(input, offset, 2);
+        return {
+            length: ((slen & 0x3f) << 8) | input[offset + 1],
+            bytes: 2
+        };
+    }
+    if ((slen & 0xe0) === 0xc0) {
+        requireBytes(input, offset, 3);
+        return {
+            length: ((slen & 0x1f) << 16) | (input[offset + 1] << 8) | input[offset + 2],
+            bytes: 3
+        };
+    }
+    if ((slen & 0xf0) === 0xe0) {
+        requireBytes(input, offset, 4);
+        return {
+            length: (((slen & 0x0f) << 24) | (input[offset + 1] << 16) |
+                (input[offset + 2] << 8) | input[offset + 3]) >>> 0,
+            bytes: 4
+        };
+    }
+
+    throw new Error(`unsupported CTB RLE run length prefix 0x${slen.toString(16)}`);
+}
+
+function requireBytes(input, offset, length) {
+    if (offset + length > input.length) {
+        throw new Error("truncated CTB RLE run length");
+    }
+}
+
+function decipher(seed, layerIndex, input) {
+    if (!seed) return input.slice();
+
+    let output = new Uint8Array(input.length);
+    let keyring = newKeyring(seed, layerIndex);
+    for (let i=0; i<input.length; i++) {
+        output[i] = input[i] ^ keyring.next();
+    }
+    return output;
+}
+
+function encipher(seed, layerIndex, input) {
+    return decipher(seed, layerIndex, input);
+}
+
+function newKeyring(seed, layerIndex) {
+    let init = (Math.imul(seed >>> 0, 0x2d83cdac) + 0xd8a83423) >>> 0;
+    let keySeed = (Math.imul(layerIndex >>> 0, 0x1e1530cd) + 0xec3d47cd) >>> 0;
+    let key = Math.imul(keySeed, init) >>> 0;
+    let index = 0;
+
+    return {
+        next() {
+            let byte = (key >>> (8 * index)) & 0xff;
+            index++;
+            if ((index & 3) === 0) {
+                key = (key + init) >>> 0;
+                index = 0;
+            }
+            return byte;
+        }
+    };
+}
+
+function imageToPNG(image, width, height) {
+    return PNG.sync.write({ width, height, data: image }, {
+        colorType: 0,
+        inputColorType: 0,
+        inputHasAlpha: false
+    });
+}
+
+function toDataView(input) {
+    return input instanceof DataView
+        ? input
+        : new DataView(input.buffer || input, input.byteOffset || 0, input.byteLength);
+}
+
+function round(value) {
+    return Number.parseFloat(Number(value || 0).toFixed(5));
+}
+
+function makeSeed(print) {
+    let { device, process } = print.settings;
+    let hash = 0x811c9dc5;
+    let text = [
+        device.deviceName,
+        device.resolutionX,
+        device.resolutionY,
+        device.bedWidth,
+        device.bedDepth,
+        process.slaSlice,
+        process.slaLayerOn,
+        process.slaBaseOn
+    ].join("|");
+
+    for (let i=0; i<text.length; i++) {
+        hash ^= text.charCodeAt(i);
+        hash = Math.imul(hash, 0x01000193) >>> 0;
+    }
+
+    return hash || 0x5eed1234;
+}
+
+class BinaryWriter {
+    constructor(buffer) {
+        this.view = new DataView(buffer);
+        this.pos = 0;
+    }
+
+    seek(pos) {
+        this.pos = pos;
+    }
+
+    skip(length) {
+        this.pos += length;
+    }
+
+    writeBytes(bytes) {
+        new Uint8Array(this.view.buffer, this.pos, bytes.length).set(bytes);
+        this.pos += bytes.length;
+    }
+
+    writeU8(value) {
+        this.view.setUint8(this.pos, value);
+        this.pos += 1;
+    }
+
+    writeU16(value) {
+        this.view.setUint16(this.pos, value, true);
+        this.pos += 2;
+    }
+
+    writeU32(value) {
+        this.view.setUint32(this.pos, value >>> 0, true);
+        this.pos += 4;
+    }
+
+    writeF32(value) {
+        this.view.setFloat32(this.pos, Number(value || 0), true);
+        this.pos += 4;
+    }
+}
+
+export const CTB = {
+    encode,
+    read,
+    toRSLA,
+    decodeLayer,
+    encodeRLE
+};