1/*
 2 * noVNC: HTML5 VNC client
 3 * Copyright (C) 2019 The noVNC authors
 4 * Licensed under MPL 2.0 (see LICENSE.txt)
 5 *
 6 * See README.md for usage and integration instructions.
 7 *
 8 */
 9
10export default class RawDecoder {
11    constructor() {
12        this._lines = 0;
13    }
14
15    decodeRect(x, y, width, height, sock, display, depth) {
16        if ((width === 0) || (height === 0)) {
17            return true;
18        }
19
20        if (this._lines === 0) {
21            this._lines = height;
22        }
23
24        const pixelSize = depth == 8 ? 1 : 4;
25        const bytesPerLine = width * pixelSize;
26
27        while (this._lines > 0) {
28            if (sock.rQwait("RAW", bytesPerLine)) {
29                return false;
30            }
31
32            const curY = y + (height - this._lines);
33
34            let data = sock.rQshiftBytes(bytesPerLine, false);
35
36            // Convert data if needed
37            if (depth == 8) {
38                const newdata = new Uint8Array(width * 4);
39                for (let i = 0; i < width; i++) {
40                    newdata[i * 4 + 0] = ((data[i] >> 0) & 0x3) * 255 / 3;
41                    newdata[i * 4 + 1] = ((data[i] >> 2) & 0x3) * 255 / 3;
42                    newdata[i * 4 + 2] = ((data[i] >> 4) & 0x3) * 255 / 3;
43                    newdata[i * 4 + 3] = 255;
44                }
45                data = newdata;
46            }
47
48            // Max sure the image is fully opaque
49            for (let i = 0; i < width; i++) {
50                data[i * 4 + 3] = 255;
51            }
52
53            display.blitImage(x, curY, width, 1, data, 0);
54            this._lines--;
55        }
56
57        return true;
58    }
59}