@replit/novnc
Version:
An HTML5 VNC client
566 lines (465 loc) • 17.3 kB
JavaScript
"use strict";
function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
Object.defineProperty(exports, "__esModule", {
value: true
});
exports["default"] = void 0;
var Log = _interopRequireWildcard(require("./util/logging.js"));
var _base = _interopRequireDefault(require("./base64.js"));
var _int = require("./util/int.js");
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function _getRequireWildcardCache() { return cache; }; return cache; }
function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || _typeof(obj) !== "object" && typeof obj !== "function") { return { "default": obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj["default"] = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
var Display = /*#__PURE__*/function () {
function Display(target) {
_classCallCheck(this, Display);
this._drawCtx = null;
this._renderQ = []; // queue drawing actions for in-oder rendering
this._flushing = false; // the full frame buffer (logical canvas) size
this._fbWidth = 0;
this._fbHeight = 0;
this._prevDrawStyle = "";
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);
Log.Debug("<< Display.constructor"); // ===== PROPERTIES =====
this._scale = 1.0;
this._clipViewport = false; // ===== EVENT HANDLERS =====
this.onflush = function () {}; // A flush request has finished
} // ===== PROPERTIES =====
_createClass(Display, [{
key: "scale",
get: function get() {
return this._scale;
},
set: function set(scale) {
this._rescale(scale);
}
}, {
key: "clipViewport",
get: function get() {
return this._clipViewport;
},
set: function set(viewport) {
this._clipViewport = viewport; // May need to readjust the viewport dimensions
var vp = this._viewportLoc;
this.viewportChangeSize(vp.w, vp.h);
this.viewportChangePos(0, 0);
}
}, {
key: "width",
get: function get() {
return this._fbWidth;
}
}, {
key: "height",
get: function get() {
return this._fbHeight;
} // ===== PUBLIC METHODS =====
}, {
key: "viewportChangePos",
value: function viewportChangePos(deltaX, deltaY) {
var 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;
}
var vx2 = vp.x + vp.w - 1;
var vy2 = vp.y + vp.h - 1; // Position change
if (deltaX < 0 && vp.x + deltaX < 0) {
deltaX = -vp.x;
}
if (vx2 + deltaX >= this._fbWidth) {
deltaX -= vx2 + deltaX - this._fbWidth + 1;
}
if (vp.y + deltaY < 0) {
deltaY = -vp.y;
}
if (vy2 + deltaY >= this._fbHeight) {
deltaY -= vy2 + deltaY - this._fbHeight + 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();
}
}, {
key: "viewportChangeSize",
value: function viewportChangeSize(width, height) {
if (!this._clipViewport || typeof width === "undefined" || typeof height === "undefined") {
Log.Debug("Setting viewport to full display region");
width = this._fbWidth;
height = this._fbHeight;
}
width = Math.floor(width);
height = Math.floor(height);
if (width > this._fbWidth) {
width = this._fbWidth;
}
if (height > this._fbHeight) {
height = this._fbHeight;
}
var vp = this._viewportLoc;
if (vp.w !== width || vp.h !== height) {
vp.w = width;
vp.h = height;
var 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);
}
}
}, {
key: "absX",
value: function absX(x) {
if (this._scale === 0) {
return 0;
}
return (0, _int.toSigned32bit)(x / this._scale + this._viewportLoc.x);
}
}, {
key: "absY",
value: function absY(y) {
if (this._scale === 0) {
return 0;
}
return (0, _int.toSigned32bit)(y / this._scale + this._viewportLoc.y);
}
}, {
key: "resize",
value: function resize(width, height) {
this._prevDrawStyle = "";
this._fbWidth = width;
this._fbHeight = height;
var canvas = this._backbuffer;
if (canvas.width !== width || canvas.height !== height) {
// We have to save the canvas data since changing the size will clear it
var 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
var vp = this._viewportLoc;
this.viewportChangeSize(vp.w, vp.h);
this.viewportChangePos(0, 0);
} // Track what parts of the visible canvas that need updating
}, {
key: "_damage",
value: function _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
}, {
key: "flip",
value: function flip(fromQueue) {
if (this._renderQ.length !== 0 && !fromQueue) {
this._renderQPush({
'type': 'flip'
});
} else {
var x = this._damageBounds.left;
var y = this._damageBounds.top;
var w = this._damageBounds.right - x;
var h = this._damageBounds.bottom - y;
var vx = x - this._viewportLoc.x;
var 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;
}
}
}, {
key: "pending",
value: function pending() {
return this._renderQ.length > 0;
}
}, {
key: "flush",
value: function flush() {
if (this._renderQ.length === 0) {
this.onflush();
} else {
this._flushing = true;
}
}
}, {
key: "fillRect",
value: function fillRect(x, y, width, height, color, fromQueue) {
if (this._renderQ.length !== 0 && !fromQueue) {
this._renderQPush({
'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);
}
}
}, {
key: "copyImage",
value: function copyImage(oldX, oldY, newX, newY, w, h, fromQueue) {
if (this._renderQ.length !== 0 && !fromQueue) {
this._renderQPush({
'type': 'copy',
'oldX': oldX,
'oldY': oldY,
'x': newX,
'y': newY,
'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, oldX, oldY, w, h, newX, newY, w, h);
this._damage(newX, newY, w, h);
}
}
}, {
key: "imageRect",
value: function imageRect(x, y, width, height, mime, arr) {
/* The internal logic cannot handle empty images, so bail early */
if (width === 0 || height === 0) {
return;
}
var img = new Image();
img.src = "data: " + mime + ";base64," + _base["default"].encode(arr);
this._renderQPush({
'type': 'img',
'img': img,
'x': x,
'y': y,
'width': width,
'height': height
});
}
}, {
key: "blitImage",
value: function blitImage(x, y, width, height, arr, offset, fromQueue) {
if (this._renderQ.length !== 0 && !fromQueue) {
// 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
var newArr = new Uint8Array(width * height * 4);
newArr.set(new Uint8Array(arr.buffer, 0, newArr.length));
this._renderQPush({
'type': 'blit',
'data': newArr,
'x': x,
'y': y,
'width': width,
'height': height
});
} else {
// NB(directxman12): arr must be an Type Array view
var data = new Uint8ClampedArray(arr.buffer, arr.byteOffset + offset, width * height * 4);
var img = new ImageData(data, width, height);
this._drawCtx.putImageData(img, x, y);
this._damage(x, y, width, height);
}
}
}, {
key: "drawImage",
value: function drawImage(img, x, y) {
this._drawCtx.drawImage(img, x, y);
this._damage(x, y, img.width, img.height);
}
}, {
key: "autoscale",
value: function autoscale(containerWidth, containerHeight) {
var scaleRatio;
if (containerWidth === 0 || containerHeight === 0) {
scaleRatio = 0;
} else {
var vp = this._viewportLoc;
var targetAspectRatio = containerWidth / containerHeight;
var fbAspectRatio = vp.w / vp.h;
if (fbAspectRatio >= targetAspectRatio) {
scaleRatio = containerWidth / vp.w;
} else {
scaleRatio = containerHeight / vp.h;
}
}
this._rescale(scaleRatio);
} // ===== PRIVATE METHODS =====
}, {
key: "_rescale",
value: function _rescale(factor) {
this._scale = factor;
var 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.
var width = factor * vp.w + 'px';
var 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;
}
}
}, {
key: "_setFillColor",
value: function _setFillColor(color) {
var newStyle = 'rgb(' + color[0] + ',' + color[1] + ',' + color[2] + ')';
if (newStyle !== this._prevDrawStyle) {
this._drawCtx.fillStyle = newStyle;
this._prevDrawStyle = newStyle;
}
}
}, {
key: "_renderQPush",
value: function _renderQPush(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._scanRenderQ();
}
}
}, {
key: "_resumeRenderQ",
value: function _resumeRenderQ() {
// "this" is the object that is ready, not the
// display object
this.removeEventListener('load', this._noVNCDisplay._resumeRenderQ);
this._noVNCDisplay._scanRenderQ();
}
}, {
key: "_scanRenderQ",
value: function _scanRenderQ() {
var ready = true;
while (ready && this._renderQ.length > 0) {
var a = this._renderQ[0];
switch (a.type) {
case 'flip':
this.flip(true);
break;
case 'copy':
this.copyImage(a.oldX, a.oldY, 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 'img':
if (a.img.complete) {
if (a.img.width !== a.width || a.img.height !== a.height) {
Log.Error("Decoded image has incorrect dimensions. Got " + a.img.width + "x" + a.img.height + ". Expected " + a.width + "x" + a.height + ".");
return;
}
this.drawImage(a.img, a.x, a.y);
} else {
a.img._noVNCDisplay = this;
a.img.addEventListener('load', this._resumeRenderQ); // 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();
}
}
}]);
return Display;
}();
exports["default"] = Display;