ltgcgo/octavia

"use strict";
 
import {gsChecksum} from "./utils.js";
 
const sysexHead = {
    xg: new Uint8Array([240, 67, 16, 76, 7]), // XG
    gs: new Uint8Array([240, 65, 16, 69, 18, 16]), // GS
    ns5r: new Uint8Array([240, 66, 48, 66, 18, 8, 0, 32]) // NS5R
};
 
Function `sysexBitmap` has 63 lines of code (exceeds 25 allowed). Consider refactoring.
Function `sysexBitmap` has a Cognitive Complexity of 13 (exceeds 5 allowed). Consider refactoring.
let sysexBitmap = function (frameData, type = "xg", frameId = 0, noCopy) {
    if (!frameData?.length) {
        throw Error(`Blank frame data`);
    };
    // 0 for XG, 1 for GS, 2 for NS5R
    let targetBuffer, targetFrame, startOffset = 8,
    canvasWidth = 16 << ((frameData.length - 1) >> 8),
    canvasHeight = 16,
    workWidth = 16, workBit = 7;
    switch (type) {
        case "xg": {
            if (frameData.length > 256) {
                throw(new Error(`Bitmap too large: ${frameData.length} > 256`));
            };
            targetBuffer = new Uint8Array(56);
            targetBuffer.set(sysexHead[type], 0);
            targetBuffer[55] = 247;
            targetFrame = frameData;
            startOffset = 7;
            break;
        };
        case "gs": {
            if (frameData.length > 256) {
                throw(new Error(`Bitmap too large: ${frameData.length} > 256`));
            };
            targetBuffer = new Uint8Array(74);
            targetBuffer.set(sysexHead[type], 0);
            targetBuffer[73] = 247;
            targetBuffer[6] = frameId + 1;
            targetFrame = frameData;
            workBit = 5;
            break;
        };
        case "ns5r": {
            if (frameData.length > 512) {
                throw(new Error(`Bitmap too large: ${frameData.length} > 512`));
            };
            targetBuffer = new Uint8Array(89);
            targetBuffer.set(sysexHead[type], 0);
            targetBuffer[88] = 247;
            // Duplicate the pixel data if the length is smaller than or equal to 256
            if (frameData.length <= 256 && !noCopy) {
                targetFrame = new Uint8Array(frameData.length * 2);
                frameData.forEach((e, i) => {
                    targetFrame[i << 1] = e;
                    targetFrame[1 + (i << 1)] = e;
                });
            } else {
                targetFrame = frameData;
            };
            workWidth = 32;
            break;
        };
        default: {
            throw(new Error(`Unknown device target ${type}`));
        };
    };
    // Packing bits into bytes
    targetFrame.forEach((e, i) => {
        let canvasX = i % workWidth, canvasY = Math.floor(i / workWidth);
        let pointer = Math.floor(canvasX / workBit) * canvasHeight + canvasY, shifter = workBit - canvasX % workBit - 1;
        targetBuffer[startOffset + pointer] ^= (e ? 1 : 0) << shifter;
    });
    if (type === "gs") {
        targetBuffer[72] = gsChecksum(targetBuffer.subarray(5, 72));
    };
    return targetBuffer;
};
 
export {
    sysexBitmap
};