59 lines
1.7 KiB
JavaScript
59 lines
1.7 KiB
JavaScript
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/*
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* noVNC: HTML5 VNC client
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* Copyright (C) 2012 Joel Martin
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* Copyright (C) 2018 Samuel Mannehed for Cendio AB
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* Copyright (C) 2018 Pierre Ossman for Cendio AB
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* Licensed under MPL 2.0 (see LICENSE.txt)
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*
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* See README.md for usage and integration instructions.
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*
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*/
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export default class RawDecoder {
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constructor() {
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this._lines = 0;
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}
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decodeRect(x, y, width, height, sock, display, depth) {
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if (this._lines === 0) {
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this._lines = height;
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}
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const pixelSize = depth == 8 ? 1 : 4;
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const bytesPerLine = width * pixelSize;
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if (sock.rQwait("RAW", bytesPerLine)) {
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return false;
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}
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const cur_y = y + (height - this._lines);
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const curr_height = Math.min(this._lines,
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Math.floor(sock.rQlen / bytesPerLine));
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let data = sock.rQ;
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let index = sock.rQi;
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// Convert data if needed
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if (depth == 8) {
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const pixels = width * curr_height;
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const newdata = new Uint8Array(pixels * 4);
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for (let i = 0; i < pixels; i++) {
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newdata[i * 4 + 0] = ((data[index + i] >> 0) & 0x3) * 255 / 3;
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newdata[i * 4 + 1] = ((data[index + i] >> 2) & 0x3) * 255 / 3;
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newdata[i * 4 + 2] = ((data[index + i] >> 4) & 0x3) * 255 / 3;
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newdata[i * 4 + 4] = 0;
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}
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data = newdata;
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index = 0;
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}
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display.blitImage(x, cur_y, width, curr_height, data, index);
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sock.rQskipBytes(curr_height * bytesPerLine);
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this._lines -= curr_height;
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if (this._lines > 0) {
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return false;
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}
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return true;
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}
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}
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