320 lines
9.4 KiB
JavaScript
320 lines
9.4 KiB
JavaScript
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/*
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* noVNC: HTML5 VNC client
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* Copyright (C) 2012 Joel Martin
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* (c) 2012 Michael Tinglof, Joe Balaz, Les Piech (Mercuri.ca)
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* Copyright (C) 2018 Samuel Mannehed for Cendio AB
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* Copyright (C) 2018 Pierre Ossman for Cendio AB
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* Licensed under MPL 2.0 (see LICENSE.txt)
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*
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* See README.md for usage and integration instructions.
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*
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*/
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import * as Log from '../util/logging.js';
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import Inflator from "../inflator.js";
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export default class TightDecoder {
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constructor() {
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this._ctl = null;
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this._filter = null;
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this._numColors = 0;
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this._palette = new Uint8Array(1024); // 256 * 4 (max palette size * max bytes-per-pixel)
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this._len = 0;
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this._zlibs = [];
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for (let i = 0; i < 4; i++) {
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this._zlibs[i] = new Inflator();
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}
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}
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decodeRect(x, y, width, height, sock, display, depth) {
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if (this._ctl === null) {
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if (sock.rQwait("TIGHT compression-control", 1)) {
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return false;
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}
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this._ctl = sock.rQshift8();
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// Reset streams if the server requests it
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for (let i = 0; i < 4; i++) {
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if ((this._ctl >> i) & 1) {
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this._zlibs[i].reset();
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Log.Info("Reset zlib stream " + i);
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}
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}
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// Figure out filter
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this._ctl = this._ctl >> 4;
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}
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let ret;
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if (this._ctl === 0x08) {
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ret = this._fillRect(x, y, width, height,
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sock, display, depth);
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} else if (this._ctl === 0x09) {
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ret = this._jpegRect(x, y, width, height,
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sock, display, depth);
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} else if (this._ctl === 0x0A) {
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ret = this._pngRect(x, y, width, height,
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sock, display, depth);
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} else if ((this._ctl & 0x80) == 0) {
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ret = this._basicRect(this._ctl, x, y, width, height,
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sock, display, depth);
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} else {
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throw new Error("Illegal tight compression received (ctl: " +
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this._ctl + ")");
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}
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if (ret) {
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this._ctl = null;
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}
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return ret;
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}
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_fillRect(x, y, width, height, sock, display, depth) {
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if (sock.rQwait("TIGHT", 3)) {
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return false;
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}
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const rQi = sock.rQi;
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const rQ = sock.rQ;
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display.fillRect(x, y, width, height,
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[rQ[rQi + 2], rQ[rQi + 1], rQ[rQi]], false);
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sock.rQskipBytes(3);
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return true;
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}
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_jpegRect(x, y, width, height, sock, display, depth) {
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let data = this._readData(sock);
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if (data === null) {
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return false;
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}
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display.imageRect(x, y, "image/jpeg", data);
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return true;
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}
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_pngRect(x, y, width, height, sock, display, depth) {
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throw new Error("PNG received in standard Tight rect");
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}
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_basicRect(ctl, x, y, width, height, sock, display, depth) {
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if (this._filter === null) {
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if (ctl & 0x4) {
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if (sock.rQwait("TIGHT", 1)) {
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return false;
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}
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this._filter = sock.rQshift8();
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} else {
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// Implicit CopyFilter
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this._filter = 0;
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}
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}
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let streamId = ctl & 0x3;
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let ret;
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switch (this._filter) {
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case 0: // CopyFilter
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ret = this._copyFilter(streamId, x, y, width, height,
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sock, display, depth);
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break;
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case 1: // PaletteFilter
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ret = this._paletteFilter(streamId, x, y, width, height,
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sock, display, depth);
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break;
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case 2: // GradientFilter
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ret = this._gradientFilter(streamId, x, y, width, height,
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sock, display, depth);
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break;
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default:
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throw new Error("Illegal tight filter received (ctl: " +
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this._filter + ")");
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}
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if (ret) {
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this._filter = null;
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}
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return ret;
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}
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_copyFilter(streamId, x, y, width, height, sock, display, depth) {
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const uncompressedSize = width * height * 3;
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let data;
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if (uncompressedSize < 12) {
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if (sock.rQwait("TIGHT", uncompressedSize)) {
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return false;
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}
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data = sock.rQshiftBytes(uncompressedSize);
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} else {
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data = this._readData(sock);
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if (data === null) {
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return false;
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}
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data = this._zlibs[streamId].inflate(data, true, uncompressedSize);
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if (data.length != uncompressedSize) {
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throw new Error("Incomplete zlib block");
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}
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}
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display.blitRgbImage(x, y, width, height, data, 0, false);
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return true;
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}
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_paletteFilter(streamId, x, y, width, height, sock, display, depth) {
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if (this._numColors === 0) {
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if (sock.rQwait("TIGHT palette", 1)) {
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return false;
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}
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const numColors = sock.rQpeek8() + 1;
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const paletteSize = numColors * 3;
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if (sock.rQwait("TIGHT palette", 1 + paletteSize)) {
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return false;
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}
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this._numColors = numColors;
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sock.rQskipBytes(1);
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sock.rQshiftTo(this._palette, paletteSize);
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}
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const bpp = (this._numColors <= 2) ? 1 : 8;
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const rowSize = Math.floor((width * bpp + 7) / 8);
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const uncompressedSize = rowSize * height;
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let data;
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if (uncompressedSize < 12) {
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if (sock.rQwait("TIGHT", uncompressedSize)) {
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return false;
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}
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data = sock.rQshiftBytes(uncompressedSize);
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} else {
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data = this._readData(sock);
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if (data === null) {
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return false;
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}
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data = this._zlibs[streamId].inflate(data, true, uncompressedSize);
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if (data.length != uncompressedSize) {
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throw new Error("Incomplete zlib block");
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}
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}
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// Convert indexed (palette based) image data to RGB
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if (this._numColors == 2) {
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this._monoRect(x, y, width, height, data, this._palette, display);
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} else {
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this._paletteRect(x, y, width, height, data, this._palette, display);
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}
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this._numColors = 0;
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return true;
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}
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_monoRect(x, y, width, height, data, palette, display) {
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// Convert indexed (palette based) image data to RGB
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// TODO: reduce number of calculations inside loop
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const dest = this._getScratchBuffer(width * height * 4);
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const w = Math.floor((width + 7) / 8);
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const w1 = Math.floor(width / 8);
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for (let y = 0; y < height; y++) {
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let dp, sp, x;
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for (x = 0; x < w1; x++) {
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for (let b = 7; b >= 0; b--) {
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dp = (y * width + x * 8 + 7 - b) * 4;
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sp = (data[y * w + x] >> b & 1) * 3;
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dest[dp] = palette[sp];
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dest[dp + 1] = palette[sp + 1];
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dest[dp + 2] = palette[sp + 2];
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dest[dp + 3] = 255;
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}
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}
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for (let b = 7; b >= 8 - width % 8; b--) {
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dp = (y * width + x * 8 + 7 - b) * 4;
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sp = (data[y * w + x] >> b & 1) * 3;
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dest[dp] = palette[sp];
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dest[dp + 1] = palette[sp + 1];
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dest[dp + 2] = palette[sp + 2];
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dest[dp + 3] = 255;
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}
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}
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display.blitRgbxImage(x, y, width, height, dest, 0, false);
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}
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_paletteRect(x, y, width, height, data, palette, display) {
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// Convert indexed (palette based) image data to RGB
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const dest = this._getScratchBuffer(width * height * 4);
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const total = width * height * 4;
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for (let i = 0, j = 0; i < total; i += 4, j++) {
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const sp = data[j] * 3;
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dest[i] = palette[sp];
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dest[i + 1] = palette[sp + 1];
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dest[i + 2] = palette[sp + 2];
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dest[i + 3] = 255;
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}
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display.blitRgbxImage(x, y, width, height, dest, 0, false);
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}
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_gradientFilter(streamId, x, y, width, height, sock, display, depth) {
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throw new Error("Gradient filter not implemented");
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}
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_readData(sock) {
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if (this._len === 0) {
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if (sock.rQwait("TIGHT", 3)) {
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return null;
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}
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let byte;
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byte = sock.rQshift8();
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this._len = byte & 0x7f;
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if (byte & 0x80) {
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byte = sock.rQshift8();
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this._len |= (byte & 0x7f) << 7;
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if (byte & 0x80) {
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byte = sock.rQshift8();
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this._len |= byte << 14;
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}
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}
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}
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if (sock.rQwait("TIGHT", this._len)) {
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return null;
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}
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let data = sock.rQshiftBytes(this._len);
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this._len = 0;
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return data;
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}
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_getScratchBuffer(size) {
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if (!this._scratchBuffer || (this._scratchBuffer.length < size)) {
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this._scratchBuffer = new Uint8Array(size);
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}
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return this._scratchBuffer;
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}
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}
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