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/*
* noVNC: HTML5 VNC client
* Copyright (C) 2019 The noVNC Authors
* 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 curY = y + (height - this._lines);
const currHeight = Math.min(this._lines,
Math.floor(sock.rQlen / bytesPerLine));
const pixels = width * currHeight;
let data = sock.rQ;
let index = sock.rQi;
// Convert data if needed
if (depth == 8) {
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 + 3] = 255;
}
data = newdata;
index = 0;
}
// Max sure the image is fully opaque
for (let i = 0; i < pixels; i++) {
data[i * 4 + 3] = 255;
}
display.blitImage(x, curY, width, currHeight, data, index);
sock.rQskipBytes(currHeight * bytesPerLine);
this._lines -= currHeight;
if (this._lines > 0) {
return false;
}
return true;
}
}
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