-/*
- * Guacamole - Clientless Remote Desktop
- * Copyright (C) 2010 Michael Jumper
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
*
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Affero General Public License for more details.
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
*
- * You should have received a copy of the GNU Affero General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
+ * The Original Code is guacamole-common-js.
+ *
+ * The Initial Developer of the Original Code is
+ * Michael Jumper.
+ * Portions created by the Initial Developer are Copyright (C) 2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
// Guacamole namespace
var Guacamole = Guacamole || {};
/**
+ * Channel mask for the composite operation "rout".
+ */
+Guacamole.Layer.ROUT = 0x2;
+
+/**
+ * Channel mask for the composite operation "atop".
+ */
+Guacamole.Layer.ATOP = 0x6;
+
+/**
+ * Channel mask for the composite operation "xor".
+ */
+Guacamole.Layer.XOR = 0xA;
+
+/**
+ * Channel mask for the composite operation "rover".
+ */
+Guacamole.Layer.ROVER = 0xB;
+
+/**
+ * Channel mask for the composite operation "over".
+ */
+Guacamole.Layer.OVER = 0xE;
+
+/**
+ * Channel mask for the composite operation "plus".
+ */
+Guacamole.Layer.PLUS = 0xF;
+
+/**
+ * Channel mask for the composite operation "rin".
+ * Beware that WebKit-based browsers may leave the contents of the destionation
+ * layer where the source layer is transparent, despite the definition of this
+ * operation.
+ */
+Guacamole.Layer.RIN = 0x1;
+
+/**
+ * Channel mask for the composite operation "in".
+ * Beware that WebKit-based browsers may leave the contents of the destionation
+ * layer where the source layer is transparent, despite the definition of this
+ * operation.
+ */
+Guacamole.Layer.IN = 0x4;
+
+/**
+ * Channel mask for the composite operation "out".
+ * Beware that WebKit-based browsers may leave the contents of the destionation
+ * layer where the source layer is transparent, despite the definition of this
+ * operation.
+ */
+Guacamole.Layer.OUT = 0x8;
+
+/**
+ * Channel mask for the composite operation "ratop".
+ * Beware that WebKit-based browsers may leave the contents of the destionation
+ * layer where the source layer is transparent, despite the definition of this
+ * operation.
+ */
+Guacamole.Layer.RATOP = 0x9;
+
+/**
+ * Channel mask for the composite operation "src".
+ * Beware that WebKit-based browsers may leave the contents of the destionation
+ * layer where the source layer is transparent, despite the definition of this
+ * operation.
+ */
+Guacamole.Layer.SRC = 0xC;
+
+/**
* Abstract ordered drawing surface. Each Layer contains a canvas element and
* provides simple drawing instructions for drawing to that canvas element,
* however unlike the canvas element itself, drawing operations on a Layer are
* @private
*/
var display = document.createElement("canvas");
- display.style.position = "absolute";
- display.style.left = "0px";
- display.style.top = "0px";
/**
* The 2D display context of the canvas element backing this Layer.
* @private
*/
var displayContext = display.getContext("2d");
+ displayContext.save();
/**
* The queue of all pending Tasks. Tasks will be run in order, with new
* @param {Number} newHeight The new height to assign to this Layer.
*/
function resize(newWidth, newHeight) {
+
+
+ // Only preserve old data if width/height are both non-zero
+ var oldData = null;
+ if (width != 0 && height != 0) {
+
+ // Create canvas and context for holding old data
+ oldData = document.createElement("canvas");
+ oldData.width = width;
+ oldData.height = height;
+
+ var oldDataContext = oldData.getContext("2d");
+
+ // Copy image data from current
+ oldDataContext.drawImage(display,
+ 0, 0, width, height,
+ 0, 0, width, height);
+
+ }
+
+ // Resize canvas
display.width = newWidth;
display.height = newHeight;
+ // Redraw old data, if any
+ if (oldData)
+ displayContext.drawImage(oldData,
+ 0, 0, width, height,
+ 0, 0, width, height);
+
width = newWidth;
height = newHeight;
}
* @private
* @param {function} taskHandler The function to call when this task
* runs, if any.
+ * @param {boolean} blocked Whether this task should start blocked.
*/
- function Task(taskHandler) {
-
+ function Task(taskHandler, blocked) {
+
+ var task = this;
+
+ /**
+ * Whether this Task is blocked.
+ *
+ * @type boolean
+ */
+ this.blocked = blocked;
+
/**
* The handler this Task is associated with, if any.
*
* @type function
*/
this.handler = taskHandler;
-
+
+ /**
+ * Unblocks this Task, allowing it to run.
+ */
+ this.unblock = function() {
+ task.blocked = false;
+ handlePendingTasks();
+ }
+
}
/**
*
* @private
* @param {function} handler The function to call when possible, if any.
+ * @param {boolean} blocked Whether the task should start blocked.
* @returns {Task} The Task created and added to the queue for future
* running, if any, or null if the handler was run
* immediately and no Task needed to be created.
*/
- function scheduleTask(handler) {
+ function scheduleTask(handler, blocked) {
// If no pending tasks, just call (if available) and exit
- if (layer.isReady() && handler != null) {
- handler();
+ if (layer.isReady() && !blocked) {
+ if (handler) handler();
return null;
}
// If tasks are pending/executing, schedule a pending task
// and return a reference to it.
- var task = new Task(handler);
+ var task = new Task(handler, blocked);
tasks.push(task);
return task;
}
+ var tasksInProgress = false;
+
/**
* Run any Tasks which were pending but are now ready to run and are not
* blocked by other Tasks.
*/
function handlePendingTasks() {
+ if (tasksInProgress)
+ return;
+
+ tasksInProgress = true;
+
// Draw all pending tasks.
var task;
- while ((task = tasks[0]) != null && task.handler) {
- task.handler();
+ while ((task = tasks[0]) != null && !task.blocked) {
tasks.shift();
+ if (task.handler) task.handler();
}
+ tasksInProgress = false;
+
}
/**
*/
this.drawImage = function(x, y, image) {
scheduleTask(function() {
- if (autosize != 0) fitRect(x, y, image.width, image.height);
+ if (layer.autosize != 0) fitRect(x, y, image.width, image.height);
displayContext.drawImage(image, x, y);
});
};
* @param {String} url The URL of the image to draw.
*/
this.draw = function(x, y, url) {
- var task = scheduleTask(null);
-
- var image = new Image();
- image.onload = function() {
- task.handler = function() {
- if (autosize != 0) fitRect(x, y, image.width, image.height);
- displayContext.drawImage(image, x, y);
- };
-
- // As this task originally had no handler and may have blocked
- // other tasks, handle any blocked tasks.
- handlePendingTasks();
+ var task = scheduleTask(function() {
+ if (layer.autosize != 0) fitRect(x, y, image.width, image.height);
+ displayContext.drawImage(image, x, y);
+ }, true);
- };
+ var image = new Image();
+ image.onload = task.unblock;
image.src = url;
};
*
* @param {function} handler The function to call once all currently
* pending operations are complete.
+ * @param {boolean} blocked Whether the task should start blocked.
*/
- this.sync = function(handler) {
- scheduleTask(handler);
- };
+ this.sync = scheduleTask;
/**
* Copy a rectangle of image data from one Layer to this Layer. This
*/
this.copyRect = function(srcLayer, srcx, srcy, srcw, srch, x, y) {
+ var drawComplete = false;
+ var srcLock = null;
+
function doCopyRect() {
- if (autosize != 0) fitRect(x, y, srcw, srch);
- displayContext.drawImage(srcLayer, srcx, srcy, srcw, srch, x, y, srcw, srch);
+ if (layer.autosize != 0) fitRect(x, y, srcw, srch);
+
+ var srcCanvas = srcLayer.getCanvas();
+ if (srcCanvas.width != 0 && srcCanvas.height != 0)
+ displayContext.drawImage(srcCanvas, srcx, srcy, srcw, srch, x, y, srcw, srch);
+
+ // Unblock the source layer now that draw is complete
+ if (srcLock != null)
+ srcLock.unblock();
+
+ // Flag operation as done
+ drawComplete = true;
}
// If we ARE the source layer, no need to sync.
// Otherwise synchronize copy operation with source layer
else {
- var task = scheduleTask(null);
- srcLayer.sync(function() {
-
- task.handler = doCopyRect;
+
+ // Currently blocked draw task
+ var task = scheduleTask(doCopyRect, true);
- // As this task originally had no handler and may have blocked
- // other tasks, handle any blocked tasks.
- handlePendingTasks();
+ // Unblock draw task once source layer is ready
+ srcLayer.sync(task.unblock);
+
+ // Block source layer until draw completes
+ // Note that the draw MAY have already been performed at this point,
+ // in which case creating a lock on the source layer will lead to
+ // deadlock (the draw task has already run and will thus never
+ // clear the lock)
+ if (!drawComplete)
+ srcLock = srcLayer.sync(null, true);
- });
}
};
*/
this.clearRect = function(x, y, w, h) {
scheduleTask(function() {
- if (autosize != 0) fitRect(x, y, w, h);
+ if (layer.autosize != 0) fitRect(x, y, w, h);
displayContext.clearRect(x, y, w, h);
});
};
/**
+ * Fill the specified rectangle of image data with the specified color.
+ *
+ * @param {Number} x The X coordinate of the upper-left corner of the
+ * rectangle to draw.
+ * @param {Number} y The Y coordinate of the upper-left corner of the
+ * rectangle to draw.
+ * @param {Number} w The width of the rectangle to draw.
+ * @param {Number} h The height of the rectangle to draw.
+ * @param {Number} r The red component of the color of the rectangle.
+ * @param {Number} g The green component of the color of the rectangle.
+ * @param {Number} b The blue component of the color of the rectangle.
+ * @param {Number} a The alpha component of the color of the rectangle.
+ */
+ this.drawRect = function(x, y, w, h, r, g, b, a) {
+ scheduleTask(function() {
+ if (layer.autosize != 0) fitRect(x, y, w, h);
+ displayContext.fillStyle = "rgba("
+ + r + "," + g + "," + b + "," + a / 255 + ")";
+ displayContext.fillRect(x, y, w, h);
+ });
+ };
+
+ /**
+ * Clip all future drawing operations by the specified rectangle.
+ *
+ * @param {Number} x The X coordinate of the upper-left corner of the
+ * rectangle to use for the clipping region.
+ * @param {Number} y The Y coordinate of the upper-left corner of the
+ * rectangle to use for the clipping region.
+ * @param {Number} w The width of the rectangle to use for the clipping region.
+ * @param {Number} h The height of the rectangle to use for the clipping region.
+ */
+ this.clipRect = function(x, y, w, h) {
+ scheduleTask(function() {
+
+ // Clear any current clipping region
+ displayContext.restore();
+ displayContext.save();
+
+ if (layer.autosize != 0) fitRect(x, y, w, h);
+
+ // Set new clipping region
+ displayContext.beginPath();
+ displayContext.rect(x, y, w, h);
+ displayContext.clip();
+
+ });
+ };
+
+ /**
* Provides the given filtering function with a writable snapshot of
* image data and the current width and height of the Layer.
*
};
// Initialize canvas dimensions
- resize(width, height);
-
-}
+ display.width = width;
+ display.height = height;
+};
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