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https://github.com/gyurix1968/guacamole-client.git
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129 lines
3.4 KiB
JavaScript
129 lines
3.4 KiB
JavaScript
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/*
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* Guacamole - Pure JavaScript/HTML VNC Client
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* Copyright (C) 2010 Michael Jumper
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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function Layer(width, height) {
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// Off-screen buffer
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var display = document.createElement("canvas");
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display.style.position = "absolute";
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display.style.left = "0px";
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display.style.right = "0px";
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display.width = width;
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display.height = height;
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var displayContext = display.getContext("2d");
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var nextUpdateToDraw = 0;
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var currentUpdate = 0;
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var updates = new Array();
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// Given an update ID, either call the provided update callback, or
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// schedule the update for later.
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function setUpdate(updateId, update) {
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// If this update is the next to draw...
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if (updateId == nextUpdateToDraw) {
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// Call provided update handler.
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update();
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// Draw all pending updates.
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var updateCallback;
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while (updateCallback = updates[++nextUpdateToDraw]) {
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updateCallback();
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delete updates[nextUpdateToDraw];
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}
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}
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// If not next to draw, set callback and wait.
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else
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updates[updateId] = update;
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}
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display.drawImage = function(x, y, image) {
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var updateId = currentUpdate++;
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setUpdate(updateId, function() {
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displayContext.drawImage(image, x, y);
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});
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}
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display.draw = function(x, y, url) {
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var updateId = currentUpdate++;
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var image = new Image();
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image.onload = function() {
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setUpdate(updateId, function() {
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displayContext.drawImage(image, x, y);
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});
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};
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image.src = url;
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};
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display.copyRect = function(srcx, srcy, w, h, x, y) {
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var updateId = currentUpdate++;
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setUpdate(updateId, function() {
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displayContext.drawImage(display, srcx, srcy, w, h, x, y, w, h);
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});
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};
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display.drawRect = function(x, y, w, h, color) {
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var updateId = currentUpdate++;
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setUpdate(updateId, function() {
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displayContext.fillStyle = color;
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displayContext.fillRect(x, y, w, h);
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});
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};
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display.clearRect = function(x, y, w, h) {
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var updateId = currentUpdate++;
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setUpdate(updateId, function() {
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displayContext.clearRect(x, y, w, h);
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});
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};
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display.filter = function(filter) {
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var updateId = currentUpdate++;
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setUpdate(updateId, function() {
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var imageData = displayContext.getImageData(0, 0, width, height);
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filter(imageData.data, width, height);
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displayContext.putImageData(imageData, 0, 0);
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});
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};
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return display;
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}
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