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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.
*
*/
import * as Log from '../util/logging.js';
export default class HextileDecoder {
constructor() {
this._tiles = 0;
this._lastsubencoding = 0;
this._tileBuffer = new Uint8Array(16 * 16 * 4);
}
decodeRect(x, y, width, height, sock, display, depth) {
if (this._tiles === 0) {
this._tilesX = Math.ceil(width / 16);
this._tilesY = Math.ceil(height / 16);
this._totalTiles = this._tilesX * this._tilesY;
this._tiles = this._totalTiles;
}
while (this._tiles > 0) {
let bytes = 1;
if (sock.rQwait("HEXTILE", bytes)) {
return false;
}
let rQ = sock.rQ;
let rQi = sock.rQi;
let subencoding = rQ[rQi]; // Peek
if (subencoding > 30) { // Raw
throw new Error("Illegal hextile subencoding (subencoding: " +
subencoding + ")");
}
const currTile = this._totalTiles - this._tiles;
const tileX = currTile % this._tilesX;
const tileY = Math.floor(currTile / this._tilesX);
const tx = x + tileX * 16;
const ty = y + tileY * 16;
const tw = Math.min(16, (x + width) - tx);
const th = Math.min(16, (y + height) - ty);
// Figure out how much we are expecting
if (subencoding & 0x01) { // Raw
bytes += tw * th * 4;
} else {
if (subencoding & 0x02) { // Background
bytes += 4;
}
if (subencoding & 0x04) { // Foreground
bytes += 4;
}
if (subencoding & 0x08) { // AnySubrects
bytes++; // Since we aren't shifting it off
if (sock.rQwait("HEXTILE", bytes)) {
return false;
}
let subrects = rQ[rQi + bytes - 1]; // Peek
if (subencoding & 0x10) { // SubrectsColoured
bytes += subrects * (4 + 2);
} else {
bytes += subrects * 2;
}
}
}
if (sock.rQwait("HEXTILE", bytes)) {
return false;
}
// We know the encoding and have a whole tile
rQi++;
if (subencoding === 0) {
if (this._lastsubencoding & 0x01) {
// Weird: ignore blanks are RAW
Log.Debug(" Ignoring blank after RAW");
} else {
display.fillRect(tx, ty, tw, th, this._background);
}
} else if (subencoding & 0x01) { // Raw
let pixels = tw * th;
// Max sure the image is fully opaque
for (let i = 0;i < pixels;i++) {
rQ[rQi + i * 4 + 3] = 255;
}
display.blitImage(tx, ty, tw, th, rQ, rQi);
rQi += bytes - 1;
} else {
if (subencoding & 0x02) { // Background
this._background = [rQ[rQi], rQ[rQi + 1], rQ[rQi + 2], rQ[rQi + 3]];
rQi += 4;
}
if (subencoding & 0x04) { // Foreground
this._foreground = [rQ[rQi], rQ[rQi + 1], rQ[rQi + 2], rQ[rQi + 3]];
rQi += 4;
}
this._startTile(tx, ty, tw, th, this._background);
if (subencoding & 0x08) { // AnySubrects
let subrects = rQ[rQi];
rQi++;
for (let s = 0; s < subrects; s++) {
let color;
if (subencoding & 0x10) { // SubrectsColoured
color = [rQ[rQi], rQ[rQi + 1], rQ[rQi + 2], rQ[rQi + 3]];
rQi += 4;
} else {
color = this._foreground;
}
const xy = rQ[rQi];
rQi++;
const sx = (xy >> 4);
const sy = (xy & 0x0f);
const wh = rQ[rQi];
rQi++;
const sw = (wh >> 4) + 1;
const sh = (wh & 0x0f) + 1;
this._subTile(sx, sy, sw, sh, color);
}
}
this._finishTile(display);
}
sock.rQi = rQi;
this._lastsubencoding = subencoding;
this._tiles--;
}
return true;
}
// start updating a tile
_startTile(x, y, width, height, color) {
this._tileX = x;
this._tileY = y;
this._tileW = width;
this._tileH = height;
const red = color[0];
const green = color[1];
const blue = color[2];
const data = this._tileBuffer;
for (let i = 0; i < width * height * 4; i += 4) {
data[i] = red;
data[i + 1] = green;
data[i + 2] = blue;
data[i + 3] = 255;
}
}
// update sub-rectangle of the current tile
_subTile(x, y, w, h, color) {
const red = color[0];
const green = color[1];
const blue = color[2];
const xend = x + w;
const yend = y + h;
const data = this._tileBuffer;
const width = this._tileW;
for (let j = y; j < yend; j++) {
for (let i = x; i < xend; i++) {
const p = (i + (j * width)) * 4;
data[p] = red;
data[p + 1] = green;
data[p + 2] = blue;
data[p + 3] = 255;
}
}
}
// draw the current tile to the screen
_finishTile(display) {
display.blitImage(this._tileX, this._tileY,
this._tileW, this._tileH,
this._tileBuffer, 0);
}
}
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