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