102 lines
2.6 KiB
JavaScript
102 lines
2.6 KiB
JavaScript
console.log("hello from emblemscanner worker");
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let qrtool = require('../qrtool.wx.js');
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// Create offscreen canvas for image generation (self-contained)
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let offscreenCanvas = null;
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function getOffscreenCanvas() {
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if (!offscreenCanvas) {
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offscreenCanvas = wx.createOffscreenCanvas({
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type: '2d',
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width: 100,
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height: 100,
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});
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}
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return offscreenCanvas;
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}
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/**
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* Convert raw frame data to data URL for image visualization
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*/
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function data_url_from_frame(width, height, image_data) {
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const canvas = getOffscreenCanvas();
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canvas.width = width;
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canvas.height = height;
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var ctx = canvas.getContext('2d');
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var imgd = ctx.createImageData(width, height);
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imgd.data.set(image_data);
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ctx.putImageData(imgd, 0, 0);
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return canvas.toDataURL("image/jpeg", 1.0);
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}
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var qrtool_ready = false;
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qrtool.onRuntimeInitialized = () => {
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console.log("emblemscanner qrtool ready");
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qrtool_ready = true;
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worker.postMessage({
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type: "ready",
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});
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}
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var submit_message = null;
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function handle_frame(data, width, height, camera_sensitivity) {
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if (!qrtool_ready) {
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console.log("qrtool not ready");
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worker.postMessage({
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type: "result",
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res: {
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ok: false,
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err: "qrtool not ready",
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},
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processing_time: 0,
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});
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return;
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}
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const begin = Date.now();
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var uca = new Uint8ClampedArray(data);
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var buf = qrtool._malloc(uca.length * uca.BYTES_PER_ELEMENT);
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qrtool.HEAPU8.set(uca, buf);
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var r = qrtool.ccall('qrtool_angle', 'string', ['number', 'number', 'number', 'number', 'number'], [buf, width, height, 0, camera_sensitivity]);
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qrtool._free(buf);
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console.log("emblemscanner worker r:", r);
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var res = JSON.parse(r);
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worker.postMessage({
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type: "result",
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res,
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processing_time: Date.now() - begin,
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});
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if (res.ok) {
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// Since image_data takes seconds to serialize, send it in a separate
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// message to the UI can update with the good news
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const dataUrl = data_url_from_frame(width, height, uca);
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submit_message = {
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type: "submit",
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res,
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image_data: { data: dataUrl, width, height },
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};
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}
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}
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worker.onMessage((msg) => {
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console.log("emblemscanner worker got message", msg.type);
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switch (msg.type) {
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case "frame":
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try {
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// Use frame data from message instead of getCameraFrameData()
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if (msg.data) {
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handle_frame(msg.data, msg.width, msg.height, msg.camera_sensitivity);
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}
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} catch (e) {
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console.log(e);
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}
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break;
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case "ready_to_submit":
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worker.postMessage(submit_message);
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break;
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default:
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console.log("Unknown message type:", msg.type);
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}
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}); |