mirror of
https://github.com/gyurix1968/guacamole-client.git
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902 lines
30 KiB
JavaScript
902 lines
30 KiB
JavaScript
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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var Guacamole = Guacamole || {};
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/**
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* Abstract ordered drawing surface. Each Layer contains a canvas element and
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* provides simple drawing instructions for drawing to that canvas element,
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* however unlike the canvas element itself, drawing operations on a Layer are
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* guaranteed to run in order, even if such an operation must wait for an image
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* to load before completing.
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*
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* @constructor
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*
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* @param {Number} width The width of the Layer, in pixels. The canvas element
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* backing this Layer will be given this width.
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*
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* @param {Number} height The height of the Layer, in pixels. The canvas element
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* backing this Layer will be given this height.
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*/
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Guacamole.Layer = function(width, height) {
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/**
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* Reference to this Layer.
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* @private
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*/
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var layer = this;
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/**
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* The canvas element backing this Layer.
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* @private
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*/
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var canvas = document.createElement("canvas");
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/**
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* The 2D display context of the canvas element backing this Layer.
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* @private
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*/
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var context = canvas.getContext("2d");
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context.save();
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/**
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* Whether a new path should be started with the next path drawing
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* operations.
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* @private
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*/
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var pathClosed = true;
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/**
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* The number of states on the state stack.
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*
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* Note that there will ALWAYS be one element on the stack, but that
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* element is not exposed. It is only used to reset the layer to its
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* initial state.
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*
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* @private
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*/
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var stackSize = 0;
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/**
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* Map of all Guacamole channel masks to HTML5 canvas composite operation
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* names. Not all channel mask combinations are currently implemented.
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* @private
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*/
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var compositeOperation = {
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/* 0x0 NOT IMPLEMENTED */
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0x1: "destination-in",
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0x2: "destination-out",
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/* 0x3 NOT IMPLEMENTED */
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0x4: "source-in",
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/* 0x5 NOT IMPLEMENTED */
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0x6: "source-atop",
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/* 0x7 NOT IMPLEMENTED */
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0x8: "source-out",
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0x9: "destination-atop",
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0xA: "xor",
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0xB: "destination-over",
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0xC: "copy",
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/* 0xD NOT IMPLEMENTED */
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0xE: "source-over",
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0xF: "lighter"
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};
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/**
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* Resizes the canvas element backing this Layer without testing the
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* new size. This function should only be used internally.
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*
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* @private
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* @param {Number} newWidth The new width to assign to this Layer.
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* @param {Number} newHeight The new height to assign to this Layer.
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*/
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function resize(newWidth, newHeight) {
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// Only preserve old data if width/height are both non-zero
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var oldData = null;
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if (layer.width !== 0 && layer.height !== 0) {
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// Create canvas and context for holding old data
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oldData = document.createElement("canvas");
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oldData.width = layer.width;
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oldData.height = layer.height;
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var oldDataContext = oldData.getContext("2d");
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// Copy image data from current
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oldDataContext.drawImage(canvas,
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0, 0, layer.width, layer.height,
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0, 0, layer.width, layer.height);
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}
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// Preserve composite operation
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var oldCompositeOperation = context.globalCompositeOperation;
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// Resize canvas
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canvas.width = newWidth;
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canvas.height = newHeight;
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// Redraw old data, if any
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if (oldData)
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context.drawImage(oldData,
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0, 0, layer.width, layer.height,
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0, 0, layer.width, layer.height);
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// Restore composite operation
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context.globalCompositeOperation = oldCompositeOperation;
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layer.width = newWidth;
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layer.height = newHeight;
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// Acknowledge reset of stack (happens on resize of canvas)
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stackSize = 0;
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context.save();
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}
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/**
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* Given the X and Y coordinates of the upper-left corner of a rectangle
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* and the rectangle's width and height, resize the backing canvas element
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* as necessary to ensure that the rectangle fits within the canvas
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* element's coordinate space. This function will only make the canvas
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* larger. If the rectangle already fits within the canvas element's
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* coordinate space, the canvas is left unchanged.
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*
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* @private
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* @param {Number} x The X coordinate of the upper-left corner of the
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* rectangle to fit.
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* @param {Number} y The Y coordinate of the upper-left corner of the
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* rectangle to fit.
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* @param {Number} w The width of the the rectangle to fit.
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* @param {Number} h The height of the the rectangle to fit.
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*/
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function fitRect(x, y, w, h) {
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// Calculate bounds
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var opBoundX = w + x;
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var opBoundY = h + y;
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// Determine max width
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var resizeWidth;
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if (opBoundX > layer.width)
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resizeWidth = opBoundX;
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else
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resizeWidth = layer.width;
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// Determine max height
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var resizeHeight;
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if (opBoundY > layer.height)
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resizeHeight = opBoundY;
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else
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resizeHeight = layer.height;
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// Resize if necessary
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layer.resize(resizeWidth, resizeHeight);
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}
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/**
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* Set to true if this Layer should resize itself to accomodate the
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* dimensions of any drawing operation, and false (the default) otherwise.
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*
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* Note that setting this property takes effect immediately, and thus may
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* take effect on operations that were started in the past but have not
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* yet completed. If you wish the setting of this flag to only modify
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* future operations, you will need to make the setting of this flag an
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* operation with sync().
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*
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* @example
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* // Set autosize to true for all future operations
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* layer.sync(function() {
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* layer.autosize = true;
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* });
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*
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* @type {Boolean}
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* @default false
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*/
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this.autosize = false;
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/**
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* The current width of this layer.
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* @type {Number}
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*/
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this.width = width;
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/**
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* The current height of this layer.
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* @type {Number}
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*/
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this.height = height;
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/**
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* Returns the canvas element backing this Layer.
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* @returns {Element} The canvas element backing this Layer.
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*/
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this.getCanvas = function() {
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return canvas;
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};
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/**
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* Changes the size of this Layer to the given width and height. Resizing
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* is only attempted if the new size provided is actually different from
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* the current size.
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*
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* @param {Number} newWidth The new width to assign to this Layer.
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* @param {Number} newHeight The new height to assign to this Layer.
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*/
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this.resize = function(newWidth, newHeight) {
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if (newWidth !== layer.width || newHeight !== layer.height)
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resize(newWidth, newHeight);
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};
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/**
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* Draws the specified image at the given coordinates. The image specified
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* must already be loaded.
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*
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* @param {Number} x The destination X coordinate.
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* @param {Number} y The destination Y coordinate.
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* @param {Image} image The image to draw. Note that this is an Image
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* object - not a URL.
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*/
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this.drawImage = function(x, y, image) {
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if (layer.autosize) fitRect(x, y, image.width, image.height);
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context.drawImage(image, x, y);
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};
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/**
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* Transfer a rectangle of image data from one Layer to this Layer using the
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* specified transfer function.
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*
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* @param {Guacamole.Layer} srcLayer The Layer to copy image data from.
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* @param {Number} srcx The X coordinate of the upper-left corner of the
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* rectangle within the source Layer's coordinate
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* space to copy data from.
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* @param {Number} srcy The Y coordinate of the upper-left corner of the
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* rectangle within the source Layer's coordinate
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* space to copy data from.
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* @param {Number} srcw The width of the rectangle within the source Layer's
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* coordinate space to copy data from.
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* @param {Number} srch The height of the rectangle within the source
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* Layer's coordinate space to copy data from.
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* @param {Number} x The destination X coordinate.
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* @param {Number} y The destination Y coordinate.
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* @param {Function} transferFunction The transfer function to use to
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* transfer data from source to
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* destination.
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*/
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this.transfer = function(srcLayer, srcx, srcy, srcw, srch, x, y, transferFunction) {
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var srcCanvas = srcLayer.getCanvas();
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// If entire rectangle outside source canvas, stop
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if (srcx >= srcCanvas.width || srcy >= srcCanvas.height) return;
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// Otherwise, clip rectangle to area
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if (srcx + srcw > srcCanvas.width)
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srcw = srcCanvas.width - srcx;
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if (srcy + srch > srcCanvas.height)
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srch = srcCanvas.height - srcy;
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// Stop if nothing to draw.
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if (srcw === 0 || srch === 0) return;
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if (layer.autosize) fitRect(x, y, srcw, srch);
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// Get image data from src and dst
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var src = srcLayer.getCanvas().getContext("2d").getImageData(srcx, srcy, srcw, srch);
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var dst = context.getImageData(x , y, srcw, srch);
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// Apply transfer for each pixel
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for (var i=0; i<srcw*srch*4; i+=4) {
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// Get source pixel environment
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var src_pixel = new Guacamole.Layer.Pixel(
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src.data[i],
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src.data[i+1],
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src.data[i+2],
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src.data[i+3]
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);
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// Get destination pixel environment
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var dst_pixel = new Guacamole.Layer.Pixel(
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dst.data[i],
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dst.data[i+1],
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dst.data[i+2],
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dst.data[i+3]
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);
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// Apply transfer function
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transferFunction(src_pixel, dst_pixel);
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// Save pixel data
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dst.data[i ] = dst_pixel.red;
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dst.data[i+1] = dst_pixel.green;
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dst.data[i+2] = dst_pixel.blue;
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dst.data[i+3] = dst_pixel.alpha;
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}
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// Draw image data
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context.putImageData(dst, x, y);
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};
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/**
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* Put a rectangle of image data from one Layer to this Layer directly
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* without performing any alpha blending. Simply copy the data.
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*
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* @param {Guacamole.Layer} srcLayer The Layer to copy image data from.
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* @param {Number} srcx The X coordinate of the upper-left corner of the
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* rectangle within the source Layer's coordinate
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* space to copy data from.
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* @param {Number} srcy The Y coordinate of the upper-left corner of the
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* rectangle within the source Layer's coordinate
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* space to copy data from.
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* @param {Number} srcw The width of the rectangle within the source Layer's
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* coordinate space to copy data from.
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* @param {Number} srch The height of the rectangle within the source
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* Layer's coordinate space to copy data from.
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* @param {Number} x The destination X coordinate.
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* @param {Number} y The destination Y coordinate.
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*/
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this.put = function(srcLayer, srcx, srcy, srcw, srch, x, y) {
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var srcCanvas = srcLayer.getCanvas();
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// If entire rectangle outside source canvas, stop
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if (srcx >= srcCanvas.width || srcy >= srcCanvas.height) return;
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// Otherwise, clip rectangle to area
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if (srcx + srcw > srcCanvas.width)
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srcw = srcCanvas.width - srcx;
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if (srcy + srch > srcCanvas.height)
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srch = srcCanvas.height - srcy;
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// Stop if nothing to draw.
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if (srcw === 0 || srch === 0) return;
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if (layer.autosize) fitRect(x, y, srcw, srch);
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// Get image data from src and dst
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var src = srcLayer.getCanvas().getContext("2d").getImageData(srcx, srcy, srcw, srch);
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context.putImageData(src, x, y);
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};
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/**
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* Copy a rectangle of image data from one Layer to this Layer. This
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* operation will copy exactly the image data that will be drawn once all
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* operations of the source Layer that were pending at the time this
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* function was called are complete. This operation will not alter the
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* size of the source Layer even if its autosize property is set to true.
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*
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* @param {Guacamole.Layer} srcLayer The Layer to copy image data from.
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* @param {Number} srcx The X coordinate of the upper-left corner of the
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* rectangle within the source Layer's coordinate
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* space to copy data from.
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* @param {Number} srcy The Y coordinate of the upper-left corner of the
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* rectangle within the source Layer's coordinate
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* space to copy data from.
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* @param {Number} srcw The width of the rectangle within the source Layer's
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* coordinate space to copy data from.
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* @param {Number} srch The height of the rectangle within the source
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* Layer's coordinate space to copy data from.
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* @param {Number} x The destination X coordinate.
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* @param {Number} y The destination Y coordinate.
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*/
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this.copy = function(srcLayer, srcx, srcy, srcw, srch, x, y) {
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var srcCanvas = srcLayer.getCanvas();
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// If entire rectangle outside source canvas, stop
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if (srcx >= srcCanvas.width || srcy >= srcCanvas.height) return;
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// Otherwise, clip rectangle to area
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if (srcx + srcw > srcCanvas.width)
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srcw = srcCanvas.width - srcx;
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if (srcy + srch > srcCanvas.height)
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srch = srcCanvas.height - srcy;
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// Stop if nothing to draw.
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if (srcw === 0 || srch === 0) return;
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if (layer.autosize) fitRect(x, y, srcw, srch);
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context.drawImage(srcCanvas, srcx, srcy, srcw, srch, x, y, srcw, srch);
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};
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/**
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* Starts a new path at the specified point.
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*
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* @param {Number} x The X coordinate of the point to draw.
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* @param {Number} y The Y coordinate of the point to draw.
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*/
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this.moveTo = function(x, y) {
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// Start a new path if current path is closed
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if (pathClosed) {
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context.beginPath();
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pathClosed = false;
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}
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if (layer.autosize) fitRect(x, y, 0, 0);
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context.moveTo(x, y);
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};
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/**
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* Add the specified line to the current path.
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*
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* @param {Number} x The X coordinate of the endpoint of the line to draw.
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* @param {Number} y The Y coordinate of the endpoint of the line to draw.
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*/
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this.lineTo = function(x, y) {
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// Start a new path if current path is closed
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if (pathClosed) {
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context.beginPath();
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pathClosed = false;
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}
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if (layer.autosize) fitRect(x, y, 0, 0);
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context.lineTo(x, y);
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};
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/**
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* Add the specified arc to the current path.
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*
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* @param {Number} x The X coordinate of the center of the circle which
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* will contain the arc.
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* @param {Number} y The Y coordinate of the center of the circle which
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* will contain the arc.
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* @param {Number} radius The radius of the circle.
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* @param {Number} startAngle The starting angle of the arc, in radians.
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* @param {Number} endAngle The ending angle of the arc, in radians.
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* @param {Boolean} negative Whether the arc should be drawn in order of
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* decreasing angle.
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*/
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this.arc = function(x, y, radius, startAngle, endAngle, negative) {
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// Start a new path if current path is closed
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if (pathClosed) {
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context.beginPath();
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pathClosed = false;
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}
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if (layer.autosize) fitRect(x, y, 0, 0);
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context.arc(x, y, radius, startAngle, endAngle, negative);
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};
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/**
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* Starts a new path at the specified point.
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*
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* @param {Number} cp1x The X coordinate of the first control point.
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* @param {Number} cp1y The Y coordinate of the first control point.
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* @param {Number} cp2x The X coordinate of the second control point.
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* @param {Number} cp2y The Y coordinate of the second control point.
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* @param {Number} x The X coordinate of the endpoint of the curve.
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* @param {Number} y The Y coordinate of the endpoint of the curve.
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*/
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this.curveTo = function(cp1x, cp1y, cp2x, cp2y, x, y) {
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// Start a new path if current path is closed
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if (pathClosed) {
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context.beginPath();
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pathClosed = false;
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}
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if (layer.autosize) fitRect(x, y, 0, 0);
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context.bezierCurveTo(cp1x, cp1y, cp2x, cp2y, x, y);
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};
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/**
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* Closes the current path by connecting the end point with the start
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* point (if any) with a straight line.
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*/
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this.close = function() {
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context.closePath();
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pathClosed = true;
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};
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/**
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* Add the specified rectangle to the current path.
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*
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* @param {Number} x The X coordinate of the upper-left corner of the
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* rectangle to draw.
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* @param {Number} y The Y coordinate of the upper-left corner of the
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* rectangle to draw.
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* @param {Number} w The width of the rectangle to draw.
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* @param {Number} h The height of the rectangle to draw.
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*/
|
|
this.rect = function(x, y, w, h) {
|
|
|
|
// Start a new path if current path is closed
|
|
if (pathClosed) {
|
|
context.beginPath();
|
|
pathClosed = false;
|
|
}
|
|
|
|
if (layer.autosize) fitRect(x, y, w, h);
|
|
context.rect(x, y, w, h);
|
|
|
|
};
|
|
|
|
/**
|
|
* Clip all future drawing operations by the current path. The current path
|
|
* is implicitly closed. The current path can continue to be reused
|
|
* for other operations (such as fillColor()) but a new path will be started
|
|
* once a path drawing operation (path() or rect()) is used.
|
|
*/
|
|
this.clip = function() {
|
|
|
|
// Set new clipping region
|
|
context.clip();
|
|
|
|
// Path now implicitly closed
|
|
pathClosed = true;
|
|
|
|
};
|
|
|
|
/**
|
|
* Stroke the current path with the specified color. The current path
|
|
* is implicitly closed. The current path can continue to be reused
|
|
* for other operations (such as clip()) but a new path will be started
|
|
* once a path drawing operation (path() or rect()) is used.
|
|
*
|
|
* @param {String} cap The line cap style. Can be "round", "square",
|
|
* or "butt".
|
|
* @param {String} join The line join style. Can be "round", "bevel",
|
|
* or "miter".
|
|
* @param {Number} thickness The line thickness in pixels.
|
|
* @param {Number} r The red component of the color to fill.
|
|
* @param {Number} g The green component of the color to fill.
|
|
* @param {Number} b The blue component of the color to fill.
|
|
* @param {Number} a The alpha component of the color to fill.
|
|
*/
|
|
this.strokeColor = function(cap, join, thickness, r, g, b, a) {
|
|
|
|
// Stroke with color
|
|
context.lineCap = cap;
|
|
context.lineJoin = join;
|
|
context.lineWidth = thickness;
|
|
context.strokeStyle = "rgba(" + r + "," + g + "," + b + "," + a/255.0 + ")";
|
|
context.stroke();
|
|
|
|
// Path now implicitly closed
|
|
pathClosed = true;
|
|
|
|
};
|
|
|
|
/**
|
|
* Fills the current path with the specified color. The current path
|
|
* is implicitly closed. The current path can continue to be reused
|
|
* for other operations (such as clip()) but a new path will be started
|
|
* once a path drawing operation (path() or rect()) is used.
|
|
*
|
|
* @param {Number} r The red component of the color to fill.
|
|
* @param {Number} g The green component of the color to fill.
|
|
* @param {Number} b The blue component of the color to fill.
|
|
* @param {Number} a The alpha component of the color to fill.
|
|
*/
|
|
this.fillColor = function(r, g, b, a) {
|
|
|
|
// Fill with color
|
|
context.fillStyle = "rgba(" + r + "," + g + "," + b + "," + a/255.0 + ")";
|
|
context.fill();
|
|
|
|
// Path now implicitly closed
|
|
pathClosed = true;
|
|
|
|
};
|
|
|
|
/**
|
|
* Stroke the current path with the image within the specified layer. The
|
|
* image data will be tiled infinitely within the stroke. The current path
|
|
* is implicitly closed. The current path can continue to be reused
|
|
* for other operations (such as clip()) but a new path will be started
|
|
* once a path drawing operation (path() or rect()) is used.
|
|
*
|
|
* @param {String} cap The line cap style. Can be "round", "square",
|
|
* or "butt".
|
|
* @param {String} join The line join style. Can be "round", "bevel",
|
|
* or "miter".
|
|
* @param {Number} thickness The line thickness in pixels.
|
|
* @param {Guacamole.Layer} srcLayer The layer to use as a repeating pattern
|
|
* within the stroke.
|
|
*/
|
|
this.strokeLayer = function(cap, join, thickness, srcLayer) {
|
|
|
|
// Stroke with image data
|
|
context.lineCap = cap;
|
|
context.lineJoin = join;
|
|
context.lineWidth = thickness;
|
|
context.strokeStyle = context.createPattern(
|
|
srcLayer.getCanvas(),
|
|
"repeat"
|
|
);
|
|
context.stroke();
|
|
|
|
// Path now implicitly closed
|
|
pathClosed = true;
|
|
|
|
};
|
|
|
|
/**
|
|
* Fills the current path with the image within the specified layer. The
|
|
* image data will be tiled infinitely within the stroke. The current path
|
|
* is implicitly closed. The current path can continue to be reused
|
|
* for other operations (such as clip()) but a new path will be started
|
|
* once a path drawing operation (path() or rect()) is used.
|
|
*
|
|
* @param {Guacamole.Layer} srcLayer The layer to use as a repeating pattern
|
|
* within the fill.
|
|
*/
|
|
this.fillLayer = function(srcLayer) {
|
|
|
|
// Fill with image data
|
|
context.fillStyle = context.createPattern(
|
|
srcLayer.getCanvas(),
|
|
"repeat"
|
|
);
|
|
context.fill();
|
|
|
|
// Path now implicitly closed
|
|
pathClosed = true;
|
|
|
|
};
|
|
|
|
/**
|
|
* Push current layer state onto stack.
|
|
*/
|
|
this.push = function() {
|
|
|
|
// Save current state onto stack
|
|
context.save();
|
|
stackSize++;
|
|
|
|
};
|
|
|
|
/**
|
|
* Pop layer state off stack.
|
|
*/
|
|
this.pop = function() {
|
|
|
|
// Restore current state from stack
|
|
if (stackSize > 0) {
|
|
context.restore();
|
|
stackSize--;
|
|
}
|
|
|
|
};
|
|
|
|
/**
|
|
* Reset the layer, clearing the stack, the current path, and any transform
|
|
* matrix.
|
|
*/
|
|
this.reset = function() {
|
|
|
|
// Clear stack
|
|
while (stackSize > 0) {
|
|
context.restore();
|
|
stackSize--;
|
|
}
|
|
|
|
// Restore to initial state
|
|
context.restore();
|
|
context.save();
|
|
|
|
// Clear path
|
|
context.beginPath();
|
|
pathClosed = false;
|
|
|
|
};
|
|
|
|
/**
|
|
* Sets the given affine transform (defined with six values from the
|
|
* transform's matrix).
|
|
*
|
|
* @param {Number} a The first value in the affine transform's matrix.
|
|
* @param {Number} b The second value in the affine transform's matrix.
|
|
* @param {Number} c The third value in the affine transform's matrix.
|
|
* @param {Number} d The fourth value in the affine transform's matrix.
|
|
* @param {Number} e The fifth value in the affine transform's matrix.
|
|
* @param {Number} f The sixth value in the affine transform's matrix.
|
|
*/
|
|
this.setTransform = function(a, b, c, d, e, f) {
|
|
context.setTransform(
|
|
a, b, c,
|
|
d, e, f
|
|
/*0, 0, 1*/
|
|
);
|
|
};
|
|
|
|
/**
|
|
* Applies the given affine transform (defined with six values from the
|
|
* transform's matrix).
|
|
*
|
|
* @param {Number} a The first value in the affine transform's matrix.
|
|
* @param {Number} b The second value in the affine transform's matrix.
|
|
* @param {Number} c The third value in the affine transform's matrix.
|
|
* @param {Number} d The fourth value in the affine transform's matrix.
|
|
* @param {Number} e The fifth value in the affine transform's matrix.
|
|
* @param {Number} f The sixth value in the affine transform's matrix.
|
|
*/
|
|
this.transform = function(a, b, c, d, e, f) {
|
|
context.transform(
|
|
a, b, c,
|
|
d, e, f
|
|
/*0, 0, 1*/
|
|
);
|
|
};
|
|
|
|
/**
|
|
* Sets the channel mask for future operations on this Layer.
|
|
*
|
|
* The channel mask is a Guacamole-specific compositing operation identifier
|
|
* with a single bit representing each of four channels (in order): source
|
|
* image where destination transparent, source where destination opaque,
|
|
* destination where source transparent, and destination where source
|
|
* opaque.
|
|
*
|
|
* @param {Number} mask The channel mask for future operations on this
|
|
* Layer.
|
|
*/
|
|
this.setChannelMask = function(mask) {
|
|
context.globalCompositeOperation = compositeOperation[mask];
|
|
};
|
|
|
|
/**
|
|
* Sets the miter limit for stroke operations using the miter join. This
|
|
* limit is the maximum ratio of the size of the miter join to the stroke
|
|
* width. If this ratio is exceeded, the miter will not be drawn for that
|
|
* joint of the path.
|
|
*
|
|
* @param {Number} limit The miter limit for stroke operations using the
|
|
* miter join.
|
|
*/
|
|
this.setMiterLimit = function(limit) {
|
|
context.miterLimit = limit;
|
|
};
|
|
|
|
// Initialize canvas dimensions
|
|
canvas.width = width;
|
|
canvas.height = height;
|
|
|
|
// Explicitly render canvas below other elements in the layer (such as
|
|
// child layers). Chrome and others may fail to render layers properly
|
|
// without this.
|
|
canvas.style.zIndex = -1;
|
|
|
|
};
|
|
|
|
/**
|
|
* 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;
|
|
|
|
/**
|
|
* Represents a single pixel of image data. All components have a minimum value
|
|
* of 0 and a maximum value of 255.
|
|
*
|
|
* @constructor
|
|
*
|
|
* @param {Number} r The red component of this pixel.
|
|
* @param {Number} g The green component of this pixel.
|
|
* @param {Number} b The blue component of this pixel.
|
|
* @param {Number} a The alpha component of this pixel.
|
|
*/
|
|
Guacamole.Layer.Pixel = function(r, g, b, a) {
|
|
|
|
/**
|
|
* The red component of this pixel, where 0 is the minimum value,
|
|
* and 255 is the maximum.
|
|
*/
|
|
this.red = r;
|
|
|
|
/**
|
|
* The green component of this pixel, where 0 is the minimum value,
|
|
* and 255 is the maximum.
|
|
*/
|
|
this.green = g;
|
|
|
|
/**
|
|
* The blue component of this pixel, where 0 is the minimum value,
|
|
* and 255 is the maximum.
|
|
*/
|
|
this.blue = b;
|
|
|
|
/**
|
|
* The alpha component of this pixel, where 0 is the minimum value,
|
|
* and 255 is the maximum.
|
|
*/
|
|
this.alpha = a;
|
|
|
|
};
|