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/**
* Import pngjs library
* https://github.com/lukeapage/pngjs
*/
const PNG = require("pngjs").PNG;
/**
* Headers used
*/
const headers = {
"Content-Type": "image/png",
"Content-Disposition": "inline; filename=\"crosshair.png\"",
"Cache-Control": "s-maxage=31536000",
// Used to protect your function from abuse
// If you want anyone to use it use "*" instead
"Access-Control-Allow-Origin": "https://www.darenliang.com"
};
/**
* Dimensions
*/
const [width, height] = [64, 64];
const [centerX, centerY] = [Math.floor(width / 2), Math.floor(height / 2)];
/**
* Parse str to number
*
* @param {string} str: string value
* @param {number} low: lowest value
* @param {number} high: highest value
* @param {number} def: default value
* @param {number} round: round reciprocal (1 / round precision)
* @return {number} number value
*/
function parseNum(str, low, high, def, round) {
let val = parseFloat(str);
val = isNaN(val) ? def : val;
if (val < low || high < val) {
return def;
}
return Math.round(val * round) / round;
}
/**
* Parse str to bool (0 - 1)
*
* @param {string} str: string value
* @param {number} def: default value
* @return {number} bool value
*/
function parseBool(str, def) {
const val = parseInt(str) || def;
if (val < 0 || 1 < val) {
return def;
}
return val;
}
/**
* Draw rectangle
*
* @param {Array<Array<Array<number>>>} pixels: pixels data
* @param {Array<Array<number>>} coords: [[x0, y0], [x1, y1]]
* @param {Array<number>} color: [r, g, b, a]
*/
function drawRectangle(pixels, coords, color) {
for (let y = coords[0][1]; y < coords[1][1]; y++) {
for (let x = coords[0][0]; x < coords[1][0]; x++) {
pixels[y][x][0] = color[0]; // red
pixels[y][x][1] = color[1]; // green
pixels[y][x][2] = color[2]; // blue
pixels[y][x][3] = color[3]; // alpha
}
}
}
/**
* Draw outline
*
* @param {Array<Array<Array<number>>>} pixels: pixels data
* @param {Array<Array<number>>} coords: [[x0, y0], [x1, y1]]
* @param {number} pad: pad size
*/
function drawOutline(pixels, coords, pad) {
const newCoords = [
[
coords[0][0] - pad,
coords[0][1] - pad
],
[
coords[1][0] + pad,
coords[1][1] + pad
]
];
drawRectangle(pixels, newCoords, [0, 0, 0, 255]);
}
/**
* Handle request
*
* @param event: event to handle
* @return {Promise<Response>} response
*/
async function handleRequest(event) {
const url = new URL(event.request.url);
const key = new Request(url.toString(), event.request);
const cache = caches.default;
/**
* If response is cached, return cached response
*/
let response = await cache.match(key);
if (response) {
return response;
}
const {searchParams} = url;
/**
* Basic
*/
const cl_crosshairthickness = parseNum(searchParams.get("cl_crosshairthickness"), 0.5, 5, 0.5, 2);
const cl_crosshairgap = parseNum(searchParams.get("cl_crosshairgap"), -2, 5, 0, 1);
const cl_crosshairsize = parseNum(searchParams.get("cl_crosshairsize"), 1, 10, 5, 1);
/**
* Outlines
*/
const cl_crosshair_drawoutline = parseBool(searchParams.get("cl_crosshair_drawoutline"), 0);
const cl_crosshair_outlinethickness = parseNum(searchParams.get("cl_crosshair_outlinethickness"), 1, 3, 1, 1);
/**
* Dot
*/
const cl_crosshairdot = parseBool(searchParams.get("cl_crosshairdot"), 0);
/**
* Color
*/
const cl_crosshaircolor = parseNum(searchParams.get("cl_crosshaircolor"), 0, 5, 1, 1);
const cl_crosshaircolor_r = parseNum(searchParams.get("cl_crosshaircolor_r"), 0, 255, 50, 1);
const cl_crosshaircolor_g = parseNum(searchParams.get("cl_crosshaircolor_g"), 0, 255, 250, 1);
const cl_crosshaircolor_b = parseNum(searchParams.get("cl_crosshaircolor_b"), 0, 255, 50, 1);
/**
* Alpha
*/
const cl_crosshairusealpha = parseBool(searchParams.get("cl_crosshairusealpha"), 1);
const cl_crosshairalpha = parseNum(searchParams.get("cl_crosshairalpha"), 0, 255, 200, 1);
const crosshairalpha = cl_crosshairusealpha === 1 ? cl_crosshairalpha : 255;
/**
* Create crosshair color
*/
let crosshaircolor;
switch (cl_crosshaircolor) {
/**
* Red
*/
case 0:
crosshaircolor = [255, 0, 0, crosshairalpha];
break;
/**
* Green
*/
case 1:
crosshaircolor = [0, 255, 0, crosshairalpha];
break;
/**
* Yellow
*/
case 2:
crosshaircolor = [255, 255, 0, crosshairalpha];
break;
/**
* Blue
*/
case 3:
crosshaircolor = [0, 0, 255, crosshairalpha];
break;
/**
* Light Blue
*/
case 4:
crosshaircolor = [0, 255, 255, crosshairalpha];
break;
/**
* Custom
*/
case 5:
crosshaircolor = [cl_crosshaircolor_r, cl_crosshaircolor_g, cl_crosshaircolor_b, crosshairalpha];
break;
}
/**
* T-shaped
*/
const cl_crosshair_t = parseBool(searchParams.get("cl_crosshair_t"), 0);
const dot = [[centerX, centerY], [centerX, centerY]];
/**
* Thickness dot
*/
{
const thickness = cl_crosshairthickness * 2;
const rb = Math.floor(thickness / 2);
const lt = thickness - rb;
dot[0][0] -= lt;
dot[0][1] -= lt;
dot[1][0] += rb;
dot[1][1] += rb;
}
/**
* Prefill pixels
*/
const pixels = [];
for (let i = 0; i < height; i++) {
pixels[i] = [];
for (let j = 0; j < width; j++) {
pixels[i][j] = [];
for (let k = 0; k < 4; k++) {
pixels[i][j][k] = 0;
}
}
}
/**
* Crosshair coordinates
*/
const topBase = dot[0][1] - 4 - cl_crosshairgap;
const bottomBase = dot[1][1] + 4 + cl_crosshairgap;
const leftBase = dot[0][0] - 4 - cl_crosshairgap;
const rightBase = dot[1][0] + 4 + cl_crosshairgap;
const crosshair = [
[[dot[0][0], topBase - cl_crosshairsize * 2], [dot[1][0], topBase]], // top
[[dot[0][0], bottomBase], [dot[1][0], bottomBase + cl_crosshairsize * 2]], // bottom
[[leftBase - cl_crosshairsize * 2, dot[0][1]], [leftBase, dot[1][1]]], // left
[[rightBase, dot[0][1]], [rightBase + cl_crosshairsize * 2, dot[1][1]]], // right
];
/**
* Color dot
*/
if (cl_crosshairdot === 1) {
/**
* Dot outline
*/
if (cl_crosshair_drawoutline === 1) {
drawOutline(pixels, dot, cl_crosshair_outlinethickness);
}
drawRectangle(pixels, dot, crosshaircolor);
}
/**
* Color crosshair
*/
for (const [i, el] of crosshair.entries()) {
/**
* Check for T crosshair
*/
if (cl_crosshair_t === 1 && i === 0) {
continue;
}
/**
* Crosshair outline
*/
if (cl_crosshair_drawoutline === 1) {
drawOutline(pixels, el, cl_crosshair_outlinethickness);
}
/**
* Crosshair part
*/
drawRectangle(pixels, el, crosshaircolor);
}
/**
* Init PNG
*/
const png = new PNG({
width: width,
height: height,
bitDepth: 8,
colorType: 6,
inputColorType: 6,
inputHasAlpha: true,
});
/**
* Raster crosshair
*/
for (let y = 0; y < png.height; y++) {
for (let x = 0; x < png.width; x++) {
const idx = (png.width * y + x) << 2;
png.data[idx] = pixels[y][x][0];
png.data[idx + 1] = pixels[y][x][1];
png.data[idx + 2] = pixels[y][x][2];
png.data[idx + 3] = pixels[y][x][3];
}
}
/**
* Write out buffer and cache response
*/
const buffer = PNG.sync.write(png);
response = new Response(buffer, {headers});
event.waitUntil(cache.put(key, response.clone()));
return response;
}
addEventListener("fetch", event => {
switch (event.request.method) {
case "GET":
return event.respondWith(handleRequest(event));
}
});
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