mirror of
https://github.com/retspen/webvirtcloud
synced 2024-12-27 00:25:22 +00:00
654 lines
20 KiB
JavaScript
Executable file
654 lines
20 KiB
JavaScript
Executable file
/*
|
|
* noVNC: HTML5 VNC client
|
|
* Copyright (C) 2018 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';
|
|
import Base64 from "./base64.js";
|
|
import { supportsImageMetadata } from './util/browser.js';
|
|
|
|
export default class Display {
|
|
constructor(target) {
|
|
this._drawCtx = null;
|
|
this._c_forceCanvas = false;
|
|
|
|
this._renderQ = []; // queue drawing actions for in-oder rendering
|
|
this._flushing = false;
|
|
|
|
// the full frame buffer (logical canvas) size
|
|
this._fb_width = 0;
|
|
this._fb_height = 0;
|
|
|
|
this._prevDrawStyle = "";
|
|
this._tile = null;
|
|
this._tile16x16 = null;
|
|
this._tile_x = 0;
|
|
this._tile_y = 0;
|
|
|
|
Log.Debug(">> Display.constructor");
|
|
|
|
// The visible canvas
|
|
this._target = target;
|
|
|
|
if (!this._target) {
|
|
throw new Error("Target must be set");
|
|
}
|
|
|
|
if (typeof this._target === 'string') {
|
|
throw new Error('target must be a DOM element');
|
|
}
|
|
|
|
if (!this._target.getContext) {
|
|
throw new Error("no getContext method");
|
|
}
|
|
|
|
this._targetCtx = this._target.getContext('2d');
|
|
|
|
// the visible canvas viewport (i.e. what actually gets seen)
|
|
this._viewportLoc = { 'x': 0, 'y': 0, 'w': this._target.width, 'h': this._target.height };
|
|
|
|
// The hidden canvas, where we do the actual rendering
|
|
this._backbuffer = document.createElement('canvas');
|
|
this._drawCtx = this._backbuffer.getContext('2d');
|
|
|
|
this._damageBounds = { left: 0, top: 0,
|
|
right: this._backbuffer.width,
|
|
bottom: this._backbuffer.height };
|
|
|
|
Log.Debug("User Agent: " + navigator.userAgent);
|
|
|
|
this.clear();
|
|
|
|
// Check canvas features
|
|
if (!('createImageData' in this._drawCtx)) {
|
|
throw new Error("Canvas does not support createImageData");
|
|
}
|
|
|
|
this._tile16x16 = this._drawCtx.createImageData(16, 16);
|
|
Log.Debug("<< Display.constructor");
|
|
|
|
// ===== PROPERTIES =====
|
|
|
|
this._scale = 1.0;
|
|
this._clipViewport = false;
|
|
this.logo = null;
|
|
|
|
// ===== EVENT HANDLERS =====
|
|
|
|
this.onflush = () => {}; // A flush request has finished
|
|
}
|
|
|
|
// ===== PROPERTIES =====
|
|
|
|
get scale() { return this._scale; }
|
|
set scale(scale) {
|
|
this._rescale(scale);
|
|
}
|
|
|
|
get clipViewport() { return this._clipViewport; }
|
|
set clipViewport(viewport) {
|
|
this._clipViewport = viewport;
|
|
// May need to readjust the viewport dimensions
|
|
const vp = this._viewportLoc;
|
|
this.viewportChangeSize(vp.w, vp.h);
|
|
this.viewportChangePos(0, 0);
|
|
}
|
|
|
|
get width() {
|
|
return this._fb_width;
|
|
}
|
|
|
|
get height() {
|
|
return this._fb_height;
|
|
}
|
|
|
|
// ===== PUBLIC METHODS =====
|
|
|
|
viewportChangePos(deltaX, deltaY) {
|
|
const vp = this._viewportLoc;
|
|
deltaX = Math.floor(deltaX);
|
|
deltaY = Math.floor(deltaY);
|
|
|
|
if (!this._clipViewport) {
|
|
deltaX = -vp.w; // clamped later of out of bounds
|
|
deltaY = -vp.h;
|
|
}
|
|
|
|
const vx2 = vp.x + vp.w - 1;
|
|
const vy2 = vp.y + vp.h - 1;
|
|
|
|
// Position change
|
|
|
|
if (deltaX < 0 && vp.x + deltaX < 0) {
|
|
deltaX = -vp.x;
|
|
}
|
|
if (vx2 + deltaX >= this._fb_width) {
|
|
deltaX -= vx2 + deltaX - this._fb_width + 1;
|
|
}
|
|
|
|
if (vp.y + deltaY < 0) {
|
|
deltaY = -vp.y;
|
|
}
|
|
if (vy2 + deltaY >= this._fb_height) {
|
|
deltaY -= (vy2 + deltaY - this._fb_height + 1);
|
|
}
|
|
|
|
if (deltaX === 0 && deltaY === 0) {
|
|
return;
|
|
}
|
|
Log.Debug("viewportChange deltaX: " + deltaX + ", deltaY: " + deltaY);
|
|
|
|
vp.x += deltaX;
|
|
vp.y += deltaY;
|
|
|
|
this._damage(vp.x, vp.y, vp.w, vp.h);
|
|
|
|
this.flip();
|
|
}
|
|
|
|
viewportChangeSize(width, height) {
|
|
|
|
if (!this._clipViewport ||
|
|
typeof(width) === "undefined" ||
|
|
typeof(height) === "undefined") {
|
|
|
|
Log.Debug("Setting viewport to full display region");
|
|
width = this._fb_width;
|
|
height = this._fb_height;
|
|
}
|
|
|
|
width = Math.floor(width);
|
|
height = Math.floor(height);
|
|
|
|
if (width > this._fb_width) {
|
|
width = this._fb_width;
|
|
}
|
|
if (height > this._fb_height) {
|
|
height = this._fb_height;
|
|
}
|
|
|
|
const vp = this._viewportLoc;
|
|
if (vp.w !== width || vp.h !== height) {
|
|
vp.w = width;
|
|
vp.h = height;
|
|
|
|
const canvas = this._target;
|
|
canvas.width = width;
|
|
canvas.height = height;
|
|
|
|
// The position might need to be updated if we've grown
|
|
this.viewportChangePos(0, 0);
|
|
|
|
this._damage(vp.x, vp.y, vp.w, vp.h);
|
|
this.flip();
|
|
|
|
// Update the visible size of the target canvas
|
|
this._rescale(this._scale);
|
|
}
|
|
}
|
|
|
|
absX(x) {
|
|
if (this._scale === 0) {
|
|
return 0;
|
|
}
|
|
return x / this._scale + this._viewportLoc.x;
|
|
}
|
|
|
|
absY(y) {
|
|
if (this._scale === 0) {
|
|
return 0;
|
|
}
|
|
return y / this._scale + this._viewportLoc.y;
|
|
}
|
|
|
|
resize(width, height) {
|
|
this._prevDrawStyle = "";
|
|
|
|
this._fb_width = width;
|
|
this._fb_height = height;
|
|
|
|
const canvas = this._backbuffer;
|
|
if (canvas.width !== width || canvas.height !== height) {
|
|
|
|
// We have to save the canvas data since changing the size will clear it
|
|
let saveImg = null;
|
|
if (canvas.width > 0 && canvas.height > 0) {
|
|
saveImg = this._drawCtx.getImageData(0, 0, canvas.width, canvas.height);
|
|
}
|
|
|
|
if (canvas.width !== width) {
|
|
canvas.width = width;
|
|
}
|
|
if (canvas.height !== height) {
|
|
canvas.height = height;
|
|
}
|
|
|
|
if (saveImg) {
|
|
this._drawCtx.putImageData(saveImg, 0, 0);
|
|
}
|
|
}
|
|
|
|
// Readjust the viewport as it may be incorrectly sized
|
|
// and positioned
|
|
const vp = this._viewportLoc;
|
|
this.viewportChangeSize(vp.w, vp.h);
|
|
this.viewportChangePos(0, 0);
|
|
}
|
|
|
|
// Track what parts of the visible canvas that need updating
|
|
_damage(x, y, w, h) {
|
|
if (x < this._damageBounds.left) {
|
|
this._damageBounds.left = x;
|
|
}
|
|
if (y < this._damageBounds.top) {
|
|
this._damageBounds.top = y;
|
|
}
|
|
if ((x + w) > this._damageBounds.right) {
|
|
this._damageBounds.right = x + w;
|
|
}
|
|
if ((y + h) > this._damageBounds.bottom) {
|
|
this._damageBounds.bottom = y + h;
|
|
}
|
|
}
|
|
|
|
// Update the visible canvas with the contents of the
|
|
// rendering canvas
|
|
flip(from_queue) {
|
|
if (this._renderQ.length !== 0 && !from_queue) {
|
|
this._renderQ_push({
|
|
'type': 'flip'
|
|
});
|
|
} else {
|
|
let x = this._damageBounds.left;
|
|
let y = this._damageBounds.top;
|
|
let w = this._damageBounds.right - x;
|
|
let h = this._damageBounds.bottom - y;
|
|
|
|
let vx = x - this._viewportLoc.x;
|
|
let vy = y - this._viewportLoc.y;
|
|
|
|
if (vx < 0) {
|
|
w += vx;
|
|
x -= vx;
|
|
vx = 0;
|
|
}
|
|
if (vy < 0) {
|
|
h += vy;
|
|
y -= vy;
|
|
vy = 0;
|
|
}
|
|
|
|
if ((vx + w) > this._viewportLoc.w) {
|
|
w = this._viewportLoc.w - vx;
|
|
}
|
|
if ((vy + h) > this._viewportLoc.h) {
|
|
h = this._viewportLoc.h - vy;
|
|
}
|
|
|
|
if ((w > 0) && (h > 0)) {
|
|
// FIXME: We may need to disable image smoothing here
|
|
// as well (see copyImage()), but we haven't
|
|
// noticed any problem yet.
|
|
this._targetCtx.drawImage(this._backbuffer,
|
|
x, y, w, h,
|
|
vx, vy, w, h);
|
|
}
|
|
|
|
this._damageBounds.left = this._damageBounds.top = 65535;
|
|
this._damageBounds.right = this._damageBounds.bottom = 0;
|
|
}
|
|
}
|
|
|
|
clear() {
|
|
if (this._logo) {
|
|
this.resize(this._logo.width, this._logo.height);
|
|
this.imageRect(0, 0, this._logo.type, this._logo.data);
|
|
} else {
|
|
this.resize(240, 20);
|
|
this._drawCtx.clearRect(0, 0, this._fb_width, this._fb_height);
|
|
}
|
|
this.flip();
|
|
}
|
|
|
|
pending() {
|
|
return this._renderQ.length > 0;
|
|
}
|
|
|
|
flush() {
|
|
if (this._renderQ.length === 0) {
|
|
this.onflush();
|
|
} else {
|
|
this._flushing = true;
|
|
}
|
|
}
|
|
|
|
fillRect(x, y, width, height, color, from_queue) {
|
|
if (this._renderQ.length !== 0 && !from_queue) {
|
|
this._renderQ_push({
|
|
'type': 'fill',
|
|
'x': x,
|
|
'y': y,
|
|
'width': width,
|
|
'height': height,
|
|
'color': color
|
|
});
|
|
} else {
|
|
this._setFillColor(color);
|
|
this._drawCtx.fillRect(x, y, width, height);
|
|
this._damage(x, y, width, height);
|
|
}
|
|
}
|
|
|
|
copyImage(old_x, old_y, new_x, new_y, w, h, from_queue) {
|
|
if (this._renderQ.length !== 0 && !from_queue) {
|
|
this._renderQ_push({
|
|
'type': 'copy',
|
|
'old_x': old_x,
|
|
'old_y': old_y,
|
|
'x': new_x,
|
|
'y': new_y,
|
|
'width': w,
|
|
'height': h,
|
|
});
|
|
} else {
|
|
// Due to this bug among others [1] we need to disable the image-smoothing to
|
|
// avoid getting a blur effect when copying data.
|
|
//
|
|
// 1. https://bugzilla.mozilla.org/show_bug.cgi?id=1194719
|
|
//
|
|
// We need to set these every time since all properties are reset
|
|
// when the the size is changed
|
|
this._drawCtx.mozImageSmoothingEnabled = false;
|
|
this._drawCtx.webkitImageSmoothingEnabled = false;
|
|
this._drawCtx.msImageSmoothingEnabled = false;
|
|
this._drawCtx.imageSmoothingEnabled = false;
|
|
|
|
this._drawCtx.drawImage(this._backbuffer,
|
|
old_x, old_y, w, h,
|
|
new_x, new_y, w, h);
|
|
this._damage(new_x, new_y, w, h);
|
|
}
|
|
}
|
|
|
|
imageRect(x, y, mime, arr) {
|
|
const img = new Image();
|
|
img.src = "data: " + mime + ";base64," + Base64.encode(arr);
|
|
this._renderQ_push({
|
|
'type': 'img',
|
|
'img': img,
|
|
'x': x,
|
|
'y': y
|
|
});
|
|
}
|
|
|
|
// start updating a tile
|
|
startTile(x, y, width, height, color) {
|
|
this._tile_x = x;
|
|
this._tile_y = y;
|
|
if (width === 16 && height === 16) {
|
|
this._tile = this._tile16x16;
|
|
} else {
|
|
this._tile = this._drawCtx.createImageData(width, height);
|
|
}
|
|
|
|
const red = color[2];
|
|
const green = color[1];
|
|
const blue = color[0];
|
|
|
|
const data = this._tile.data;
|
|
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[2];
|
|
const green = color[1];
|
|
const blue = color[0];
|
|
const xend = x + w;
|
|
const yend = y + h;
|
|
|
|
const data = this._tile.data;
|
|
const width = this._tile.width;
|
|
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() {
|
|
this._drawCtx.putImageData(this._tile, this._tile_x, this._tile_y);
|
|
this._damage(this._tile_x, this._tile_y,
|
|
this._tile.width, this._tile.height);
|
|
}
|
|
|
|
blitImage(x, y, width, height, arr, offset, from_queue) {
|
|
if (this._renderQ.length !== 0 && !from_queue) {
|
|
// NB(directxman12): it's technically more performant here to use preallocated arrays,
|
|
// but it's a lot of extra work for not a lot of payoff -- if we're using the render queue,
|
|
// this probably isn't getting called *nearly* as much
|
|
const new_arr = new Uint8Array(width * height * 4);
|
|
new_arr.set(new Uint8Array(arr.buffer, 0, new_arr.length));
|
|
this._renderQ_push({
|
|
'type': 'blit',
|
|
'data': new_arr,
|
|
'x': x,
|
|
'y': y,
|
|
'width': width,
|
|
'height': height,
|
|
});
|
|
} else {
|
|
this._bgrxImageData(x, y, width, height, arr, offset);
|
|
}
|
|
}
|
|
|
|
blitRgbImage(x, y, width, height, arr, offset, from_queue) {
|
|
if (this._renderQ.length !== 0 && !from_queue) {
|
|
// NB(directxman12): it's technically more performant here to use preallocated arrays,
|
|
// but it's a lot of extra work for not a lot of payoff -- if we're using the render queue,
|
|
// this probably isn't getting called *nearly* as much
|
|
const new_arr = new Uint8Array(width * height * 3);
|
|
new_arr.set(new Uint8Array(arr.buffer, 0, new_arr.length));
|
|
this._renderQ_push({
|
|
'type': 'blitRgb',
|
|
'data': new_arr,
|
|
'x': x,
|
|
'y': y,
|
|
'width': width,
|
|
'height': height,
|
|
});
|
|
} else {
|
|
this._rgbImageData(x, y, width, height, arr, offset);
|
|
}
|
|
}
|
|
|
|
blitRgbxImage(x, y, width, height, arr, offset, from_queue) {
|
|
if (this._renderQ.length !== 0 && !from_queue) {
|
|
// NB(directxman12): it's technically more performant here to use preallocated arrays,
|
|
// but it's a lot of extra work for not a lot of payoff -- if we're using the render queue,
|
|
// this probably isn't getting called *nearly* as much
|
|
const new_arr = new Uint8Array(width * height * 4);
|
|
new_arr.set(new Uint8Array(arr.buffer, 0, new_arr.length));
|
|
this._renderQ_push({
|
|
'type': 'blitRgbx',
|
|
'data': new_arr,
|
|
'x': x,
|
|
'y': y,
|
|
'width': width,
|
|
'height': height,
|
|
});
|
|
} else {
|
|
this._rgbxImageData(x, y, width, height, arr, offset);
|
|
}
|
|
}
|
|
|
|
drawImage(img, x, y) {
|
|
this._drawCtx.drawImage(img, x, y);
|
|
this._damage(x, y, img.width, img.height);
|
|
}
|
|
|
|
autoscale(containerWidth, containerHeight) {
|
|
let scaleRatio;
|
|
|
|
if (containerWidth === 0 || containerHeight === 0) {
|
|
scaleRatio = 0;
|
|
|
|
} else {
|
|
|
|
const vp = this._viewportLoc;
|
|
const targetAspectRatio = containerWidth / containerHeight;
|
|
const fbAspectRatio = vp.w / vp.h;
|
|
|
|
if (fbAspectRatio >= targetAspectRatio) {
|
|
scaleRatio = containerWidth / vp.w;
|
|
} else {
|
|
scaleRatio = containerHeight / vp.h;
|
|
}
|
|
}
|
|
|
|
this._rescale(scaleRatio);
|
|
}
|
|
|
|
// ===== PRIVATE METHODS =====
|
|
|
|
_rescale(factor) {
|
|
this._scale = factor;
|
|
const vp = this._viewportLoc;
|
|
|
|
// NB(directxman12): If you set the width directly, or set the
|
|
// style width to a number, the canvas is cleared.
|
|
// However, if you set the style width to a string
|
|
// ('NNNpx'), the canvas is scaled without clearing.
|
|
const width = factor * vp.w + 'px';
|
|
const height = factor * vp.h + 'px';
|
|
|
|
if ((this._target.style.width !== width) ||
|
|
(this._target.style.height !== height)) {
|
|
this._target.style.width = width;
|
|
this._target.style.height = height;
|
|
}
|
|
}
|
|
|
|
_setFillColor(color) {
|
|
const newStyle = 'rgb(' + color[2] + ',' + color[1] + ',' + color[0] + ')';
|
|
if (newStyle !== this._prevDrawStyle) {
|
|
this._drawCtx.fillStyle = newStyle;
|
|
this._prevDrawStyle = newStyle;
|
|
}
|
|
}
|
|
|
|
_rgbImageData(x, y, width, height, arr, offset) {
|
|
const img = this._drawCtx.createImageData(width, height);
|
|
const data = img.data;
|
|
for (let i = 0, j = offset; i < width * height * 4; i += 4, j += 3) {
|
|
data[i] = arr[j];
|
|
data[i + 1] = arr[j + 1];
|
|
data[i + 2] = arr[j + 2];
|
|
data[i + 3] = 255; // Alpha
|
|
}
|
|
this._drawCtx.putImageData(img, x, y);
|
|
this._damage(x, y, img.width, img.height);
|
|
}
|
|
|
|
_bgrxImageData(x, y, width, height, arr, offset) {
|
|
const img = this._drawCtx.createImageData(width, height);
|
|
const data = img.data;
|
|
for (let i = 0, j = offset; i < width * height * 4; i += 4, j += 4) {
|
|
data[i] = arr[j + 2];
|
|
data[i + 1] = arr[j + 1];
|
|
data[i + 2] = arr[j];
|
|
data[i + 3] = 255; // Alpha
|
|
}
|
|
this._drawCtx.putImageData(img, x, y);
|
|
this._damage(x, y, img.width, img.height);
|
|
}
|
|
|
|
_rgbxImageData(x, y, width, height, arr, offset) {
|
|
// NB(directxman12): arr must be an Type Array view
|
|
let img;
|
|
if (supportsImageMetadata) {
|
|
img = new ImageData(new Uint8ClampedArray(arr.buffer, arr.byteOffset, width * height * 4), width, height);
|
|
} else {
|
|
img = this._drawCtx.createImageData(width, height);
|
|
img.data.set(new Uint8ClampedArray(arr.buffer, arr.byteOffset, width * height * 4));
|
|
}
|
|
this._drawCtx.putImageData(img, x, y);
|
|
this._damage(x, y, img.width, img.height);
|
|
}
|
|
|
|
_renderQ_push(action) {
|
|
this._renderQ.push(action);
|
|
if (this._renderQ.length === 1) {
|
|
// If this can be rendered immediately it will be, otherwise
|
|
// the scanner will wait for the relevant event
|
|
this._scan_renderQ();
|
|
}
|
|
}
|
|
|
|
_resume_renderQ() {
|
|
// "this" is the object that is ready, not the
|
|
// display object
|
|
this.removeEventListener('load', this._noVNC_display._resume_renderQ);
|
|
this._noVNC_display._scan_renderQ();
|
|
}
|
|
|
|
_scan_renderQ() {
|
|
let ready = true;
|
|
while (ready && this._renderQ.length > 0) {
|
|
const a = this._renderQ[0];
|
|
switch (a.type) {
|
|
case 'flip':
|
|
this.flip(true);
|
|
break;
|
|
case 'copy':
|
|
this.copyImage(a.old_x, a.old_y, a.x, a.y, a.width, a.height, true);
|
|
break;
|
|
case 'fill':
|
|
this.fillRect(a.x, a.y, a.width, a.height, a.color, true);
|
|
break;
|
|
case 'blit':
|
|
this.blitImage(a.x, a.y, a.width, a.height, a.data, 0, true);
|
|
break;
|
|
case 'blitRgb':
|
|
this.blitRgbImage(a.x, a.y, a.width, a.height, a.data, 0, true);
|
|
break;
|
|
case 'blitRgbx':
|
|
this.blitRgbxImage(a.x, a.y, a.width, a.height, a.data, 0, true);
|
|
break;
|
|
case 'img':
|
|
if (a.img.complete) {
|
|
this.drawImage(a.img, a.x, a.y);
|
|
} else {
|
|
a.img._noVNC_display = this;
|
|
a.img.addEventListener('load', this._resume_renderQ);
|
|
// We need to wait for this image to 'load'
|
|
// to keep things in-order
|
|
ready = false;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (ready) {
|
|
this._renderQ.shift();
|
|
}
|
|
}
|
|
|
|
if (this._renderQ.length === 0 && this._flushing) {
|
|
this._flushing = false;
|
|
this.onflush();
|
|
}
|
|
}
|
|
}
|