67 lines
1.8 KiB
JavaScript
67 lines
1.8 KiB
JavaScript
|
/*
|
||
|
|
* 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 ((width === 0) || (height === 0)) {
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
}
|