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741 lines
26 KiB
741 lines
26 KiB
/*
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* noVNC: HTML5 VNC client
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* Copyright (C) 2012 Joel Martin
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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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/*jslint browser: true, white: false */
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/*global Util, Base64, changeCursor */
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var Display;
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(function () {
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"use strict";
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Display = function (defaults) {
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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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// 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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// the visible "physical canvas" viewport
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this._viewportLoc = { 'x': 0, 'y': 0, 'w': 0, 'h': 0 };
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this._cleanRect = { 'x1': 0, 'y1': 0, 'x2': -1, 'y2': -1 };
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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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Util.set_defaults(this, defaults, {
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'true_color': true,
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'colourMap': [],
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'scale': 1.0,
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'viewport': false,
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'render_mode': ''
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});
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Util.Debug(">> Display.constructor");
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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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if (!this._drawCtx) {
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this._drawCtx = this._target.getContext('2d');
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}
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Util.Debug("User Agent: " + navigator.userAgent);
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if (Util.Engine.gecko) { Util.Debug("Browser: gecko " + Util.Engine.gecko); }
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if (Util.Engine.webkit) { Util.Debug("Browser: webkit " + Util.Engine.webkit); }
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if (Util.Engine.trident) { Util.Debug("Browser: trident " + Util.Engine.trident); }
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if (Util.Engine.presto) { Util.Debug("Browser: presto " + Util.Engine.presto); }
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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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this._render_mode = 'canvas rendering';
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} else {
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throw new Error("Canvas does not support createImageData");
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}
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if (this._prefer_js === null) {
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Util.Info("Preferring javascript operations");
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this._prefer_js = true;
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}
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// Determine browser support for setting the cursor via data URI scheme
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var curDat = [];
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for (var i = 0; i < 8 * 8 * 4; i++) {
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curDat.push(255);
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}
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try {
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var curSave = this._target.style.cursor;
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Display.changeCursor(this._target, curDat, curDat, 2, 2, 8, 8);
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if (this._target.style.cursor) {
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if (this._cursor_uri === null || this._cursor_uri === undefined) {
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this._cursor_uri = true;
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}
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Util.Info("Data URI scheme cursor supported");
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} else {
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if (this._cursor_uri === null || this._cursor_uri === undefined) {
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this._cursor_uri = false;
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}
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Util.Warn("Data URI scheme cursor not supported");
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}
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this._target.style.cursor = curSave;
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} catch (exc) {
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Util.Error("Data URI scheme cursor test exception: " + exc);
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this._cursor_uri = false;
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}
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Util.Debug("<< Display.constructor");
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};
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Display.prototype = {
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// Public methods
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viewportChange: function (deltaX, deltaY, width, height) {
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var vp = this._viewportLoc;
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var cr = this._cleanRect;
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var canvas = this._target;
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if (!this._viewport) {
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Util.Debug("Setting viewport to full display region");
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deltaX = -vp.w; // clamped later of out of bounds
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deltaY = -vp.h;
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width = this._fb_width;
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height = this._fb_height;
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}
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if (typeof(deltaX) === "undefined") { deltaX = 0; }
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if (typeof(deltaY) === "undefined") { deltaY = 0; }
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if (typeof(width) === "undefined") { width = vp.w; }
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if (typeof(height) === "undefined") { height = vp.h; }
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// Size change
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if (width > this._fb_width) { width = this._fb_width; }
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if (height > this._fb_height) { height = this._fb_height; }
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if (vp.w !== width || vp.h !== height) {
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// Change width
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if (width < vp.w && cr.x2 > vp.x + width - 1) {
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cr.x2 = vp.x + width - 1;
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}
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vp.w = width;
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// Change height
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if (height < vp.h && cr.y2 > vp.y + height - 1) {
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cr.y2 = vp.y + height - 1;
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}
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vp.h = height;
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var saveImg = null;
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if (vp.w > 0 && vp.h > 0 && canvas.width > 0 && canvas.height > 0) {
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var img_width = canvas.width < vp.w ? canvas.width : vp.w;
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var img_height = canvas.height < vp.h ? canvas.height : vp.h;
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saveImg = this._drawCtx.getImageData(0, 0, img_width, img_height);
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}
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canvas.width = vp.w;
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canvas.height = vp.h;
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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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var vx2 = vp.x + vp.w - 1;
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var 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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Util.Debug("viewportChange deltaX: " + deltaX + ", deltaY: " + deltaY);
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vp.x += deltaX;
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vx2 += deltaX;
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vp.y += deltaY;
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vy2 += deltaY;
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// Update the clean rectangle
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if (vp.x > cr.x1) {
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cr.x1 = vp.x;
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}
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if (vx2 < cr.x2) {
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cr.x2 = vx2;
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}
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if (vp.y > cr.y1) {
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cr.y1 = vp.y;
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}
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if (vy2 < cr.y2) {
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cr.y2 = vy2;
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}
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var x1, w;
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if (deltaX < 0) {
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// Shift viewport left, redraw left section
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x1 = 0;
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w = -deltaX;
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} else {
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// Shift viewport right, redraw right section
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x1 = vp.w - deltaX;
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w = deltaX;
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}
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var y1, h;
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if (deltaY < 0) {
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// Shift viewport up, redraw top section
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y1 = 0;
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h = -deltaY;
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} else {
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// Shift viewport down, redraw bottom section
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y1 = vp.h - deltaY;
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h = deltaY;
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}
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// Copy the valid part of the viewport to the shifted location
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var saveStyle = this._drawCtx.fillStyle;
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this._drawCtx.fillStyle = "rgb(255,255,255)";
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if (deltaX !== 0) {
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this._drawCtx.drawImage(canvas, 0, 0, vp.w, vp.h, -deltaX, 0, vp.w, vp.h);
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this._drawCtx.fillRect(x1, 0, w, vp.h);
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}
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if (deltaY !== 0) {
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this._drawCtx.drawImage(canvas, 0, 0, vp.w, vp.h, 0, -deltaY, vp.w, vp.h);
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this._drawCtx.fillRect(0, y1, vp.w, h);
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}
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this._drawCtx.fillStyle = saveStyle;
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},
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// Return a map of clean and dirty areas of the viewport and reset the
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// tracking of clean and dirty areas
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//
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// Returns: { 'cleanBox': { 'x': x, 'y': y, 'w': w, 'h': h},
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// 'dirtyBoxes': [{ 'x': x, 'y': y, 'w': w, 'h': h }, ...] }
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getCleanDirtyReset: function () {
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var vp = this._viewportLoc;
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var cr = this._cleanRect;
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var cleanBox = { 'x': cr.x1, 'y': cr.y1,
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'w': cr.x2 - cr.x1 + 1, 'h': cr.y2 - cr.y1 + 1 };
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var dirtyBoxes = [];
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if (cr.x1 >= cr.x2 || cr.y1 >= cr.y2) {
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// Whole viewport is dirty
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dirtyBoxes.push({ 'x': vp.x, 'y': vp.y, 'w': vp.w, 'h': vp.h });
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} else {
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// Redraw dirty regions
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var vx2 = vp.x + vp.w - 1;
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var vy2 = vp.y + vp.h - 1;
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if (vp.x < cr.x1) {
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// left side dirty region
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dirtyBoxes.push({'x': vp.x, 'y': vp.y,
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'w': cr.x1 - vp.x + 1, 'h': vp.h});
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}
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if (vx2 > cr.x2) {
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// right side dirty region
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dirtyBoxes.push({'x': cr.x2 + 1, 'y': vp.y,
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'w': vx2 - cr.x2, 'h': vp.h});
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}
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if(vp.y < cr.y1) {
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// top/middle dirty region
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dirtyBoxes.push({'x': cr.x1, 'y': vp.y,
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'w': cr.x2 - cr.x1 + 1, 'h': cr.y1 - vp.y});
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}
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if (vy2 > cr.y2) {
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// bottom/middle dirty region
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dirtyBoxes.push({'x': cr.x1, 'y': cr.y2 + 1,
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'w': cr.x2 - cr.x1 + 1, 'h': vy2 - cr.y2});
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}
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}
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this._cleanRect = {'x1': vp.x, 'y1': vp.y,
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'x2': vp.x + vp.w - 1, 'y2': vp.y + vp.h - 1};
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return {'cleanBox': cleanBox, 'dirtyBoxes': dirtyBoxes};
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},
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absX: function (x) {
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return x + this._viewportLoc.x;
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},
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absY: function (y) {
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return y + this._viewportLoc.y;
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},
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resize: function (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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this._rescale(this._scale);
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this.viewportChange();
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},
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clear: function () {
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if (this._logo) {
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this.resize(this._logo.width, this._logo.height);
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this.blitStringImage(this._logo.data, 0, 0);
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} else {
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if (Util.Engine.trident === 6) {
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// NB(directxman12): there's a bug in IE10 where we can fail to actually
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// clear the canvas here because of the resize.
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// Clearing the current viewport first fixes the issue
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this._drawCtx.clearRect(0, 0, this._viewportLoc.w, this._viewportLoc.h);
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}
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this.resize(640, 20);
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this._drawCtx.clearRect(0, 0, this._viewportLoc.w, this._viewportLoc.h);
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}
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this._renderQ = [];
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},
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fillRect: function (x, y, width, height, color) {
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this._setFillColor(color);
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this._drawCtx.fillRect(x - this._viewportLoc.x, y - this._viewportLoc.y, width, height);
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},
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copyImage: function (old_x, old_y, new_x, new_y, w, h) {
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var x1 = old_x - this._viewportLoc.x;
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var y1 = old_y - this._viewportLoc.y;
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var x2 = new_x - this._viewportLoc.x;
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var y2 = new_y - this._viewportLoc.y;
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this._drawCtx.drawImage(this._target, x1, y1, w, h, x2, y2, w, h);
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},
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// start updating a tile
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startTile: function (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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if (this._prefer_js) {
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var bgr;
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if (this._true_color) {
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bgr = color;
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} else {
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bgr = this._colourMap[color[0]];
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}
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var red = bgr[2];
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var green = bgr[1];
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var blue = bgr[0];
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var data = this._tile.data;
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for (var 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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} else {
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this.fillRect(x, y, width, height, color);
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}
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},
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// update sub-rectangle of the current tile
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subTile: function (x, y, w, h, color) {
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if (this._prefer_js) {
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var bgr;
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if (this._true_color) {
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bgr = color;
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} else {
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bgr = this._colourMap[color[0]];
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}
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var red = bgr[2];
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var green = bgr[1];
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var blue = bgr[0];
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var xend = x + w;
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var yend = y + h;
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var data = this._tile.data;
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var width = this._tile.width;
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for (var j = y; j < yend; j++) {
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for (var i = x; i < xend; i++) {
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var 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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} else {
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this.fillRect(this._tile_x + x, this._tile_y + y, w, h, color);
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}
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},
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// draw the current tile to the screen
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finishTile: function () {
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if (this._prefer_js) {
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this._drawCtx.putImageData(this._tile, this._tile_x - this._viewportLoc.x,
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this._tile_y - this._viewportLoc.y);
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}
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// else: No-op -- already done by setSubTile
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},
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blitImage: function (x, y, width, height, arr, offset) {
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if (this._true_color) {
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this._bgrxImageData(x, y, this._viewportLoc.x, this._viewportLoc.y, width, height, arr, offset);
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} else {
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this._cmapImageData(x, y, this._viewportLoc.x, this._viewportLoc.y, width, height, arr, offset);
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}
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},
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blitRgbImage: function (x, y , width, height, arr, offset) {
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if (this._true_color) {
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this._rgbImageData(x, y, this._viewportLoc.x, this._viewportLoc.y, width, height, arr, offset);
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} else {
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// probably wrong?
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this._cmapImageData(x, y, this._viewportLoc.x, this._viewportLoc.y, width, height, arr, offset);
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}
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},
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blitStringImage: function (str, x, y) {
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var img = new Image();
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img.onload = function () {
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this._drawCtx.drawImage(img, x - this._viewportLoc.x, y - this._viewportLoc.y);
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}.bind(this);
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img.src = str;
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return img; // for debugging purposes
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},
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// wrap ctx.drawImage but relative to viewport
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drawImage: function (img, x, y) {
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this._drawCtx.drawImage(img, x - this._viewportLoc.x, y - this._viewportLoc.y);
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},
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renderQ_push: function (action) {
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this._renderQ.push(action);
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if (this._renderQ.length === 1) {
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// If this can be rendered immediately it will be, otherwise
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// the scanner will start polling the queue (every
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// requestAnimationFrame interval)
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this._scan_renderQ();
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}
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},
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changeCursor: function (pixels, mask, hotx, hoty, w, h) {
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if (this._cursor_uri === false) {
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Util.Warn("changeCursor called but no cursor data URI support");
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return;
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}
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if (this._true_color) {
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Display.changeCursor(this._target, pixels, mask, hotx, hoty, w, h);
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} else {
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Display.changeCursor(this._target, pixels, mask, hotx, hoty, w, h, this._colourMap);
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}
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},
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defaultCursor: function () {
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this._target.style.cursor = "default";
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},
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// Overridden getters/setters
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get_context: function () {
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return this._drawCtx;
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},
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set_scale: function (scale) {
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this._rescale(scale);
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},
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set_width: function (w) {
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this.resize(w, this._fb_height);
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},
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get_width: function () {
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return this._fb_width;
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},
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set_height: function (h) {
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this.resize(this._fb_width, h);
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},
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get_height: function () {
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return this._fb_height;
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},
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|
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// Private Methods
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|
_rescale: function (factor) {
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var canvas = this._target;
|
|
var properties = ['transform', 'WebkitTransform', 'MozTransform'];
|
|
var transform_prop;
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|
while ((transform_prop = properties.shift())) {
|
|
if (typeof canvas.style[transform_prop] !== 'undefined') {
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (transform_prop === null) {
|
|
Util.Debug("No scaling support");
|
|
return;
|
|
}
|
|
|
|
if (typeof(factor) === "undefined") {
|
|
factor = this._scale;
|
|
} else if (factor > 1.0) {
|
|
factor = 1.0;
|
|
} else if (factor < 0.1) {
|
|
factor = 0.1;
|
|
}
|
|
|
|
if (this._scale === factor) {
|
|
return;
|
|
}
|
|
|
|
this._scale = factor;
|
|
var x = canvas.width - (canvas.width * factor);
|
|
var y = canvas.height - (canvas.height * factor);
|
|
canvas.style[transform_prop] = 'scale(' + this._scale + ') translate(-' + x + 'px, -' + y + 'px)';
|
|
},
|
|
|
|
_setFillColor: function (color) {
|
|
var bgr;
|
|
if (this._true_color) {
|
|
bgr = color;
|
|
} else {
|
|
bgr = this._colourMap[color[0]];
|
|
}
|
|
|
|
var newStyle = 'rgb(' + bgr[2] + ',' + bgr[1] + ',' + bgr[0] + ')';
|
|
if (newStyle !== this._prevDrawStyle) {
|
|
this._drawCtx.fillStyle = newStyle;
|
|
this._prevDrawStyle = newStyle;
|
|
}
|
|
},
|
|
|
|
_rgbImageData: function (x, y, vx, vy, width, height, arr, offset) {
|
|
var img = this._drawCtx.createImageData(width, height);
|
|
var data = img.data;
|
|
for (var 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 - vx, y - vy);
|
|
},
|
|
|
|
_bgrxImageData: function (x, y, vx, vy, width, height, arr, offset) {
|
|
var img = this._drawCtx.createImageData(width, height);
|
|
var data = img.data;
|
|
for (var 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 - vx, y - vy);
|
|
},
|
|
|
|
_cmapImageData: function (x, y, vx, vy, width, height, arr, offset) {
|
|
var img = this._drawCtx.createImageData(width, height);
|
|
var data = img.data;
|
|
var cmap = this._colourMap;
|
|
for (var i = 0, j = offset; i < width * height * 4; i += 4, j++) {
|
|
var bgr = cmap[arr[j]];
|
|
data[i] = bgr[2];
|
|
data[i + 1] = bgr[1];
|
|
data[i + 2] = bgr[0];
|
|
data[i + 3] = 255; // Alpha
|
|
}
|
|
this._drawCtx.putImageData(img, x - vx, y - vy);
|
|
},
|
|
|
|
_scan_renderQ: function () {
|
|
var ready = true;
|
|
while (ready && this._renderQ.length > 0) {
|
|
var a = this._renderQ[0];
|
|
switch (a.type) {
|
|
case 'copy':
|
|
this.copyImage(a.old_x, a.old_y, a.x, a.y, a.width, a.height);
|
|
break;
|
|
case 'fill':
|
|
this.fillRect(a.x, a.y, a.width, a.height, a.color);
|
|
break;
|
|
case 'blit':
|
|
this.blitImage(a.x, a.y, a.width, a.height, a.data, 0);
|
|
break;
|
|
case 'blitRgb':
|
|
this.blitRgbImage(a.x, a.y, a.width, a.height, a.data, 0);
|
|
break;
|
|
case 'img':
|
|
if (a.img.complete) {
|
|
this.drawImage(a.img, a.x, a.y);
|
|
} else {
|
|
// 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) {
|
|
requestAnimFrame(this._scan_renderQ.bind(this));
|
|
}
|
|
},
|
|
};
|
|
|
|
Util.make_properties(Display, [
|
|
['target', 'wo', 'dom'], // Canvas element for rendering
|
|
['context', 'ro', 'raw'], // Canvas 2D context for rendering (read-only)
|
|
['logo', 'rw', 'raw'], // Logo to display when cleared: {"width": w, "height": h, "data": data}
|
|
['true_color', 'rw', 'bool'], // Use true-color pixel data
|
|
['colourMap', 'rw', 'arr'], // Colour map array (when not true-color)
|
|
['scale', 'rw', 'float'], // Display area scale factor 0.0 - 1.0
|
|
['viewport', 'rw', 'bool'], // Use a viewport set with viewportChange()
|
|
['width', 'rw', 'int'], // Display area width
|
|
['height', 'rw', 'int'], // Display area height
|
|
|
|
['render_mode', 'ro', 'str'], // Canvas rendering mode (read-only)
|
|
|
|
['prefer_js', 'rw', 'str'], // Prefer Javascript over canvas methods
|
|
['cursor_uri', 'rw', 'raw'] // Can we render cursor using data URI
|
|
]);
|
|
|
|
// Class Methods
|
|
Display.changeCursor = function (target, pixels, mask, hotx, hoty, w0, h0, cmap) {
|
|
var w = w0;
|
|
var h = h0;
|
|
if (h < w) {
|
|
h = w; // increase h to make it square
|
|
} else {
|
|
w = h; // increase w to make it square
|
|
}
|
|
|
|
var cur = [];
|
|
|
|
// Push multi-byte little-endian values
|
|
cur.push16le = function (num) {
|
|
this.push(num & 0xFF, (num >> 8) & 0xFF);
|
|
};
|
|
cur.push32le = function (num) {
|
|
this.push(num & 0xFF,
|
|
(num >> 8) & 0xFF,
|
|
(num >> 16) & 0xFF,
|
|
(num >> 24) & 0xFF);
|
|
};
|
|
|
|
var IHDRsz = 40;
|
|
var RGBsz = w * h * 4;
|
|
var XORsz = Math.ceil((w * h) / 8.0);
|
|
var ANDsz = Math.ceil((w * h) / 8.0);
|
|
|
|
cur.push16le(0); // 0: Reserved
|
|
cur.push16le(2); // 2: .CUR type
|
|
cur.push16le(1); // 4: Number of images, 1 for non-animated ico
|
|
|
|
// Cursor #1 header (ICONDIRENTRY)
|
|
cur.push(w); // 6: width
|
|
cur.push(h); // 7: height
|
|
cur.push(0); // 8: colors, 0 -> true-color
|
|
cur.push(0); // 9: reserved
|
|
cur.push16le(hotx); // 10: hotspot x coordinate
|
|
cur.push16le(hoty); // 12: hotspot y coordinate
|
|
cur.push32le(IHDRsz + RGBsz + XORsz + ANDsz);
|
|
// 14: cursor data byte size
|
|
cur.push32le(22); // 18: offset of cursor data in the file
|
|
|
|
// Cursor #1 InfoHeader (ICONIMAGE/BITMAPINFO)
|
|
cur.push32le(IHDRsz); // 22: InfoHeader size
|
|
cur.push32le(w); // 26: Cursor width
|
|
cur.push32le(h * 2); // 30: XOR+AND height
|
|
cur.push16le(1); // 34: number of planes
|
|
cur.push16le(32); // 36: bits per pixel
|
|
cur.push32le(0); // 38: Type of compression
|
|
|
|
cur.push32le(XORsz + ANDsz);
|
|
// 42: Size of Image
|
|
cur.push32le(0); // 46: reserved
|
|
cur.push32le(0); // 50: reserved
|
|
cur.push32le(0); // 54: reserved
|
|
cur.push32le(0); // 58: reserved
|
|
|
|
// 62: color data (RGBQUAD icColors[])
|
|
var y, x;
|
|
for (y = h - 1; y >= 0; y--) {
|
|
for (x = 0; x < w; x++) {
|
|
if (x >= w0 || y >= h0) {
|
|
cur.push(0); // blue
|
|
cur.push(0); // green
|
|
cur.push(0); // red
|
|
cur.push(0); // alpha
|
|
} else {
|
|
var idx = y * Math.ceil(w0 / 8) + Math.floor(x / 8);
|
|
var alpha = (mask[idx] << (x % 8)) & 0x80 ? 255 : 0;
|
|
if (cmap) {
|
|
idx = (w0 * y) + x;
|
|
var rgb = cmap[pixels[idx]];
|
|
cur.push(rgb[2]); // blue
|
|
cur.push(rgb[1]); // green
|
|
cur.push(rgb[0]); // red
|
|
cur.push(alpha); // alpha
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// XOR/bitmask data (BYTE icXOR[])
|
|
// (ignored, just needs to be the right size)
|
|
for (y = 0; y < h; y++) {
|
|
for (x = 0; x < Math.ceil(w / 8); x++) {
|
|
cur.push(0);
|
|
}
|
|
}
|
|
|
|
// AND/bitmask data (BYTE icAND[])
|
|
// (ignored, just needs to be the right size)
|
|
for (y = 0; y < h; y++) {
|
|
for (x = 0; x < Math.ceil(w / 8); x++) {
|
|
cur.push(0);
|
|
}
|
|
}
|
|
|
|
var url = 'data:image/x-icon;base64,' + Base64.encode(cur);
|
|
target.style.cursor = 'url(' + url + ')' + hotx + ' ' + hoty + ', default';
|
|
};
|
|
})();
|