spb/admin-ka

1/*2 * noVNC: HTML5 VNC client3 * Copyright (C) 2019 The noVNC authors4 * Licensed under MPL 2.0 (see LICENSE.txt)5 *6 * See README.md for usage and integration instructions.7 *8 */910export default class RawDecoder {11    constructor() {12        this._lines = 0;13    }1415    decodeRect(x, y, width, height, sock, display, depth) {16        if ((width === 0) || (height === 0)) {17            return true;18        }1920        if (this._lines === 0) {21            this._lines = height;22        }2324        const pixelSize = depth == 8 ? 1 : 4;25        const bytesPerLine = width * pixelSize;2627        while (this._lines > 0) {28            if (sock.rQwait("RAW", bytesPerLine)) {29                return false;30            }3132            const curY = y + (height - this._lines);3334            let data = sock.rQshiftBytes(bytesPerLine, false);3536            // Convert data if needed37            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            }4748            // Max sure the image is fully opaque49            for (let i = 0; i < width; i++) {50                data[i * 4 + 3] = 255;51            }5253            display.blitImage(x, curY, width, 1, data, 0);54            this._lines--;55        }5657        return true;58    }59}60