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