mirror of
https://github.com/antos-rde/antosdk-apps.git
synced 2024-09-07 05:14:42 +02:00
112 lines
2.8 KiB
JavaScript
112 lines
2.8 KiB
JavaScript
let resolution;
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decode_jpeg = (raw, msg) =>
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{
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if(!JpegImage)
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{
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console.error("The JPEG library is not available");
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return 0;
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}
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let jpeg = new JpegImage()
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jpeg.parse(raw)
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if(jpeg.width != msg.w || jpeg.height != msg.h)
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{
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console.error("Incorrect data size: expect " + msg.w*msg.h*4 + " got " + jpeg.width*jpeg.height*4);
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return 0;
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}
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msg.pixels = new Uint8Array(msg.w*msg.h*4);
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let data = jpeg.getData(msg.w, msg.h);
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for(let j = 0; j < msg.h; j++)
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{
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for(let i = 0; i < msg.w; i++)
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{
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let index = j*msg.w*4 + i*4;
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msg.pixels[index] = data[j*msg.w*3 + i*3];
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msg.pixels[index+1] = data[j*msg.w*3 + i*3 + 1];
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msg.pixels[index+2] = data[j*msg.w*3 + i*3 + 2];
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msg.pixels[index+3] = 255;
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}
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}
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return msg.pixels.length;
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}
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decode_raw = (raw, msg) =>
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{
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let size =raw.length;
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if(resolution.depth == 32)
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{
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msg.pixels = new Uint8Array(raw);
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return size;
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}
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if(resolution.depth != 16)
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{
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console.error("Unsupported depth" + resolution.depth);
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return 0;
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}
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let bytes = resolution.depth/8;
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let npixels = size / bytes;
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let outsize = npixels*4;
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if(outsize != msg.w*msg.h*4)
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{
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console.error("Incorrect data size: expect " + msg.w*msg.h*4 + " got " + outsize);
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return 0;
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}
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msg.pixels = new Uint8Array(outsize);
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let value = 0;
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let px = {};
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for(let i = 0; i < npixels; i++)
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{
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value = 0;
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for(let j=0; j < bytes; j++ )
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value = (raw[i * bytes + j] << (j*8)) | value ;
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// lookup for pixel
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msg.pixels[i*4] = (value & 0x1F) * (255 / 31);
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msg.pixels[i*4+1] = ((value >> 5) & 0x3F) * (255 / 63);
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msg.pixels[i*4+2] = ((value >> 11) & 0x1F) * (255 / 31);
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msg.pixels[i*4+3] = 255;
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}
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return outsize;
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}
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decode = (arr) =>
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{
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let datain = new Uint8Array(arr);
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let msg = {
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x: datain[1] | (datain[2] << 8),
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y: datain[3] | (datain[4] << 8),
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w: datain[5] | (datain[6] << 8),
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h: datain[7] | (datain[8] << 8),
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flag: datain[9],
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pixels: undefined
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}
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switch (msg.flag) {
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case 0x0:
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decode_raw(datain.subarray(10), msg);
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break;
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case 0x1:
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decode_jpeg(datain.subarray(10), msg);
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break;
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default:
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console.error("Unknow flag: " + msg.flag);
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}
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if(msg.pixels)
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{
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msg.pixels = msg.pixels.buffer;
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postMessage(msg, [msg.pixels]);
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}
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}
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onmessage = (e) => {
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if(e.data.depth)
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{
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resolution = e.data;
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}
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else if(e.data.libjpeg)
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{
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importScripts(e.data.libjpeg);
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}
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else
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{
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decode(e.data);
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}
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} |