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cdb55d26e5
This is WebKit bug https://bugs.webkit.org/show_bug.cgi?id=46319 The workaround is to wrap Canvas render functions with a function that sets a flush timer. The flush function sets the right margin and then 1ms later sets it back. This triggers the canvas to redraw with the correct contents. Two downsides: - rendering is slower, but only on the busted versions of webkit. Correct and useful is better than fast and useless. - There is a barely perceptible jitter of the control buttons because the canvas size is changing by one pixel. To support this functionality, we also have to read out the exact webkit version from the user agent in the render engine detection code in include/util.js.
782 lines
24 KiB
JavaScript
782 lines
24 KiB
JavaScript
/*
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* noVNC: HTML5 VNC client
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* Copyright (C) 2010 Joel Martin
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* Licensed under LGPL-3 (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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"use strict";
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/*jslint browser: true, white: false, bitwise: false */
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/*global window, Util, Base64 */
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function Canvas(conf) {
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conf = conf || {}; // Configuration
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var that = {}, // Public API interface
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// Private Canvas namespace variables
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c_forceCanvas = false,
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c_width = 0,
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c_height = 0,
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c_prevStyle = "",
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c_keyPress = null,
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c_mouseButton = null,
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c_mouseMove = null,
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c_webkit_bug = false,
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c_flush_timer = null;
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// Configuration settings
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function cdef(v, type, defval, desc) {
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Util.conf_default(conf, that, v, type, defval, desc); }
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// Capability settings, default can be overridden
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cdef('prefer_js', 'raw', null, 'Prefer Javascript over canvas methods');
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cdef('cursor_uri', 'raw', null, 'Can we render cursor using data URI');
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cdef('target', 'dom', null, 'Canvas element for VNC viewport');
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cdef('focusContainer', 'dom', document, 'DOM element that traps keyboard input');
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cdef('true_color', 'bool', true, 'Request true color pixel data');
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cdef('focused', 'bool', true, 'Capture and send key strokes');
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cdef('colourMap', 'raw', [], 'Colour map array (not true color)');
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cdef('scale', 'float', 1, 'VNC viewport scale factor');
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cdef('render_mode', 'str', '', 'Canvas rendering mode (read-only)');
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// Override some specific getters/setters
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that.set_prefer_js = function(val) {
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if (val && c_forceCanvas) {
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Util.Warn("Preferring Javascript to Canvas ops is not supported");
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return false;
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}
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conf.prefer_js = val;
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return true;
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};
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that.get_colourMap = function(idx) {
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if (typeof idx === 'undefined') {
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return conf.colourMap;
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} else {
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return conf.colourMap[idx];
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}
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};
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that.set_colourMap = function(val, idx) {
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if (typeof idx === 'undefined') {
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conf.colourMap = val;
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} else {
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conf.colourMap[idx] = val;
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}
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};
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that.set_render_mode = function () { throw("render_mode is read-only"); };
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// Add some other getters/setters
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that.get_width = function() {
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return c_width;
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};
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that.get_height = function() {
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return c_height;
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};
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//
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// Private functions
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//
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// Create the public API interface
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function constructor() {
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Util.Debug(">> Canvas.init");
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var c, ctx, func, origfunc, imgTest, tval, i, curDat, curSave,
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has_imageData = false, UE = Util.Engine;
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if (! conf.target) { throw("target must be set"); }
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if (typeof conf.target === 'string') {
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conf.target = window.$(conf.target);
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}
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c = conf.target;
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if (! c.getContext) { throw("no getContext method"); }
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if (! conf.ctx) { conf.ctx = c.getContext('2d'); }
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ctx = conf.ctx;
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if (UE.gecko) { Util.Debug("Browser: gecko " + UE.gecko); }
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if (UE.webkit) { Util.Debug("Browser: webkit " + UE.webkit); }
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if (UE.trident) { Util.Debug("Browser: trident " + UE.trident); }
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if (UE.presto) { Util.Debug("Browser: presto " + UE.presto); }
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that.clear();
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/*
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* Determine browser Canvas feature support
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* and select fastest rendering methods
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*/
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tval = 0;
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try {
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imgTest = ctx.getImageData(0, 0, 1,1);
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imgTest.data[0] = 123;
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imgTest.data[3] = 255;
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ctx.putImageData(imgTest, 0, 0);
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tval = ctx.getImageData(0, 0, 1, 1).data[0];
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if (tval === 123) {
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has_imageData = true;
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}
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} catch (exc1) {}
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if (has_imageData) {
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Util.Info("Canvas supports imageData");
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c_forceCanvas = false;
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if (ctx.createImageData) {
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// If it's there, it's faster
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Util.Info("Using Canvas createImageData");
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conf.render_mode = "createImageData rendering";
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that.imageData = that.imageDataCreate;
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} else if (ctx.getImageData) {
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// I think this is mostly just Opera
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Util.Info("Using Canvas getImageData");
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conf.render_mode = "getImageData rendering";
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that.imageData = that.imageDataGet;
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}
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Util.Info("Prefering javascript operations");
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if (conf.prefer_js === null) {
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conf.prefer_js = true;
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}
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that.rgbxImage = that.rgbxImageData;
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that.cmapImage = that.cmapImageData;
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} else {
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Util.Warn("Canvas lacks imageData, using fillRect (slow)");
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conf.render_mode = "fillRect rendering (slow)";
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c_forceCanvas = true;
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conf.prefer_js = false;
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that.rgbxImage = that.rgbxImageFill;
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that.cmapImage = that.cmapImageFill;
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}
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if (UE.webkit && UE.webkit >= 534.7 && UE.webkit <= 534.9) {
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// Workaround WebKit canvas rendering bug #46319
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conf.render_mode += ", webkit bug workaround";
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Util.Debug("Working around WebKit bug #46319");
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c_webkit_bug = true;
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for (func in {"fillRect":1, "copyImage":1, "rgbxImage":1,
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"cmapImage":1, "blitStringImage":1}) {
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that[func] = (function() {
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var myfunc = that[func]; // Save original function
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//Util.Debug("Wrapping " + func);
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return function() {
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myfunc.apply(this, arguments);
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if (!c_flush_timer) {
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c_flush_timer = setTimeout(that.flush, 100);
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}
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};
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})();
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}
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}
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/*
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* Determine browser support for setting the cursor via data URI
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* scheme
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*/
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curDat = [];
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for (i=0; i < 8 * 8 * 4; i += 1) {
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curDat.push(255);
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}
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try {
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curSave = c.style.cursor;
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that.changeCursor(curDat, curDat, 2, 2, 8, 8);
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if (c.style.cursor) {
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if (conf.cursor_uri === null) {
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conf.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 (conf.cursor_uri === null) {
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conf.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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c.style.cursor = curSave;
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} catch (exc2) {
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Util.Error("Data URI scheme cursor test exception: " + exc2);
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conf.cursor_uri = false;
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}
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conf.focused = true;
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Util.Debug("<< Canvas.init");
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return that ;
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}
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/* Translate DOM key event to keysym value */
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function getKeysym(e) {
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var evt, keysym;
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evt = (e ? e : window.event);
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/* Remap modifier and special keys */
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switch ( evt.keyCode ) {
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case 8 : keysym = 0xFF08; break; // BACKSPACE
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case 9 : keysym = 0xFF09; break; // TAB
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case 13 : keysym = 0xFF0D; break; // ENTER
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case 27 : keysym = 0xFF1B; break; // ESCAPE
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case 45 : keysym = 0xFF63; break; // INSERT
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case 46 : keysym = 0xFFFF; break; // DELETE
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case 36 : keysym = 0xFF50; break; // HOME
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case 35 : keysym = 0xFF57; break; // END
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case 33 : keysym = 0xFF55; break; // PAGE_UP
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case 34 : keysym = 0xFF56; break; // PAGE_DOWN
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case 37 : keysym = 0xFF51; break; // LEFT
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case 38 : keysym = 0xFF52; break; // UP
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case 39 : keysym = 0xFF53; break; // RIGHT
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case 40 : keysym = 0xFF54; break; // DOWN
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case 112 : keysym = 0xFFBE; break; // F1
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case 113 : keysym = 0xFFBF; break; // F2
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case 114 : keysym = 0xFFC0; break; // F3
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case 115 : keysym = 0xFFC1; break; // F4
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case 116 : keysym = 0xFFC2; break; // F5
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case 117 : keysym = 0xFFC3; break; // F6
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case 118 : keysym = 0xFFC4; break; // F7
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case 119 : keysym = 0xFFC5; break; // F8
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case 120 : keysym = 0xFFC6; break; // F9
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case 121 : keysym = 0xFFC7; break; // F10
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case 122 : keysym = 0xFFC8; break; // F11
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case 123 : keysym = 0xFFC9; break; // F12
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case 16 : keysym = 0xFFE1; break; // SHIFT
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case 17 : keysym = 0xFFE3; break; // CONTROL
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//case 18 : keysym = 0xFFE7; break; // Left Meta (Mac Option)
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case 18 : keysym = 0xFFE9; break; // Left ALT (Mac Command)
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default : keysym = evt.keyCode; break;
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}
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/* Remap symbols */
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switch (keysym) {
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case 186 : keysym = 59; break; // ; (IE)
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case 187 : keysym = 61; break; // = (IE)
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case 188 : keysym = 44; break; // , (Mozilla, IE)
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case 109 : // - (Mozilla)
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if (Util.Engine.gecko) {
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keysym = 45; }
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break;
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case 189 : keysym = 45; break; // - (IE)
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case 190 : keysym = 46; break; // . (Mozilla, IE)
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case 191 : keysym = 47; break; // / (Mozilla, IE)
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case 192 : keysym = 96; break; // ` (Mozilla, IE)
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case 219 : keysym = 91; break; // [ (Mozilla, IE)
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case 220 : keysym = 92; break; // \ (Mozilla, IE)
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case 221 : keysym = 93; break; // ] (Mozilla, IE)
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case 222 : keysym = 39; break; // ' (Mozilla, IE)
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}
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/* Remap shifted and unshifted keys */
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if (!!evt.shiftKey) {
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switch (keysym) {
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case 48 : keysym = 41 ; break; // ) (shifted 0)
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case 49 : keysym = 33 ; break; // ! (shifted 1)
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case 50 : keysym = 64 ; break; // @ (shifted 2)
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case 51 : keysym = 35 ; break; // # (shifted 3)
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case 52 : keysym = 36 ; break; // $ (shifted 4)
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case 53 : keysym = 37 ; break; // % (shifted 5)
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case 54 : keysym = 94 ; break; // ^ (shifted 6)
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case 55 : keysym = 38 ; break; // & (shifted 7)
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case 56 : keysym = 42 ; break; // * (shifted 8)
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case 57 : keysym = 40 ; break; // ( (shifted 9)
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case 59 : keysym = 58 ; break; // : (shifted `)
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case 61 : keysym = 43 ; break; // + (shifted ;)
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case 44 : keysym = 60 ; break; // < (shifted ,)
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case 45 : keysym = 95 ; break; // _ (shifted -)
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case 46 : keysym = 62 ; break; // > (shifted .)
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case 47 : keysym = 63 ; break; // ? (shifted /)
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case 96 : keysym = 126; break; // ~ (shifted `)
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case 91 : keysym = 123; break; // { (shifted [)
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case 92 : keysym = 124; break; // | (shifted \)
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case 93 : keysym = 125; break; // } (shifted ])
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case 39 : keysym = 34 ; break; // " (shifted ')
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}
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} else if ((keysym >= 65) && (keysym <=90)) {
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/* Remap unshifted A-Z */
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keysym += 32;
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}
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return keysym;
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}
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function onMouseButton(e, down) {
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var evt, pos, bmask;
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if (! conf.focused) {
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return true;
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}
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evt = (e ? e : window.event);
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pos = Util.getEventPosition(e, conf.target, conf.scale);
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bmask = 1 << evt.button;
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//Util.Debug('mouse ' + pos.x + "," + pos.y + " down: " + down + " bmask: " + bmask);
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if (c_mouseButton) {
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c_mouseButton(pos.x, pos.y, down, bmask);
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}
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Util.stopEvent(e);
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return false;
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}
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function onMouseDown(e) {
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onMouseButton(e, 1);
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}
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function onMouseUp(e) {
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onMouseButton(e, 0);
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}
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function onMouseWheel(e) {
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var evt, pos, bmask, wheelData;
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evt = (e ? e : window.event);
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pos = Util.getEventPosition(e, conf.target, conf.scale);
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wheelData = evt.detail ? evt.detail * -1 : evt.wheelDelta / 40;
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if (wheelData > 0) {
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bmask = 1 << 3;
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} else {
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bmask = 1 << 4;
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}
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//Util.Debug('mouse scroll by ' + wheelData + ':' + pos.x + "," + pos.y);
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if (c_mouseButton) {
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c_mouseButton(pos.x, pos.y, 1, bmask);
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c_mouseButton(pos.x, pos.y, 0, bmask);
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}
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Util.stopEvent(e);
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return false;
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}
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function onMouseMove(e) {
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var evt, pos;
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evt = (e ? e : window.event);
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pos = Util.getEventPosition(e, conf.target, conf.scale);
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//Util.Debug('mouse ' + evt.which + '/' + evt.button + ' up:' + pos.x + "," + pos.y);
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if (c_mouseMove) {
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c_mouseMove(pos.x, pos.y);
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}
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}
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function onKeyDown(e) {
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//Util.Debug("keydown: " + getKeysym(e));
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if (! conf.focused) {
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return true;
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}
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if (c_keyPress) {
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c_keyPress(getKeysym(e), 1);
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}
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Util.stopEvent(e);
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return false;
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}
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function onKeyUp(e) {
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//Util.Debug("keyup: " + getKeysym(e));
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if (! conf.focused) {
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return true;
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}
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if (c_keyPress) {
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c_keyPress(getKeysym(e), 0);
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}
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Util.stopEvent(e);
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return false;
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}
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function onMouseDisable(e) {
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var evt, pos;
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if (! conf.focused) {
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return true;
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}
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evt = (e ? e : window.event);
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pos = Util.getEventPosition(e, conf.target, conf.scale);
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/* Stop propagation if inside canvas area */
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if ((pos.x >= 0) && (pos.y >= 0) &&
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(pos.x < c_width) && (pos.y < c_height)) {
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//Util.Debug("mouse event disabled");
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Util.stopEvent(e);
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return false;
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}
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//Util.Debug("mouse event not disabled");
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return true;
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}
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//
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// Public API interface functions
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//
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that.getContext = function () {
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return conf.ctx;
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};
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that.start = function(keyPressFunc, mouseButtonFunc, mouseMoveFunc) {
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var c;
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Util.Debug(">> Canvas.start");
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c = conf.target;
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c_keyPress = keyPressFunc || null;
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c_mouseButton = mouseButtonFunc || null;
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c_mouseMove = mouseMoveFunc || null;
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Util.addEvent(conf.focusContainer, 'keydown', onKeyDown);
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Util.addEvent(conf.focusContainer, 'keyup', onKeyUp);
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Util.addEvent(c, 'mousedown', onMouseDown);
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Util.addEvent(c, 'mouseup', onMouseUp);
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Util.addEvent(c, 'mousemove', onMouseMove);
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Util.addEvent(c, (Util.Engine.gecko) ? 'DOMMouseScroll' : 'mousewheel',
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onMouseWheel);
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/* Work around right and middle click browser behaviors */
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Util.addEvent(conf.focusContainer, 'click', onMouseDisable);
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Util.addEvent(conf.focusContainer.body, 'contextmenu', onMouseDisable);
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Util.Debug("<< Canvas.start");
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};
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that.rescale = function(factor) {
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var c, tp, x, y,
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properties = ['transform', 'WebkitTransform', 'MozTransform', null];
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c = conf.target;
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tp = properties.shift();
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while (tp) {
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if (typeof c.style[tp] !== 'undefined') {
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break;
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}
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tp = properties.shift();
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}
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if (tp === null) {
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Util.Debug("No scaling support");
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return;
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}
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if (conf.scale === factor) {
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//Util.Debug("Canvas already scaled to '" + factor + "'");
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return;
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}
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conf.scale = factor;
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x = c.width - c.width * factor;
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y = c.height - c.height * factor;
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c.style[tp] = "scale(" + conf.scale + ") translate(-" + x + "px, -" + y + "px)";
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};
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that.resize = function(width, height, true_color) {
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var c = conf.target;
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if (typeof true_color !== "undefined") {
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conf.true_color = true_color;
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}
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c_prevStyle = "";
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c.width = width;
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c.height = height;
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c_width = c.offsetWidth;
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c_height = c.offsetHeight;
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that.rescale(conf.scale);
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};
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that.clear = function() {
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that.resize(640, 20);
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conf.ctx.clearRect(0, 0, c_width, c_height);
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};
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that.stop = function() {
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var c = conf.target;
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Util.removeEvent(conf.focusContainer, 'keydown', onKeyDown);
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Util.removeEvent(conf.focusContainer, 'keyup', onKeyUp);
|
|
Util.removeEvent(c, 'mousedown', onMouseDown);
|
|
Util.removeEvent(c, 'mouseup', onMouseUp);
|
|
Util.removeEvent(c, 'mousemove', onMouseMove);
|
|
Util.removeEvent(c, (Util.Engine.gecko) ? 'DOMMouseScroll' : 'mousewheel',
|
|
onMouseWheel);
|
|
|
|
/* Work around right and middle click browser behaviors */
|
|
Util.removeEvent(conf.focusContainer, 'click', onMouseDisable);
|
|
Util.removeEvent(conf.focusContainer.body, 'contextmenu', onMouseDisable);
|
|
|
|
// Turn off cursor rendering
|
|
if (conf.cursor_uri) {
|
|
c.style.cursor = "default";
|
|
}
|
|
};
|
|
|
|
that.flush = function() {
|
|
var old_val;
|
|
//Util.Debug(">> flush");
|
|
// Force canvas redraw (for webkit bug #46319 workaround)
|
|
old_val = conf.target.style.marginRight;
|
|
conf.target.style.marginRight = "1";
|
|
c_flush_timer = null;
|
|
setTimeout(function () {
|
|
conf.target.style.marginRight = old_val;
|
|
}, 1);
|
|
};
|
|
|
|
that.setFillColor = function(color) {
|
|
var rgb, newStyle;
|
|
if (conf.true_color) {
|
|
rgb = color;
|
|
} else {
|
|
rgb = conf.colourMap[color[0]];
|
|
}
|
|
newStyle = "rgb(" + rgb[0] + "," + rgb[1] + "," + rgb[2] + ")";
|
|
if (newStyle !== c_prevStyle) {
|
|
conf.ctx.fillStyle = newStyle;
|
|
c_prevStyle = newStyle;
|
|
}
|
|
};
|
|
|
|
that.fillRect = function(x, y, width, height, color) {
|
|
that.setFillColor(color);
|
|
conf.ctx.fillRect(x, y, width, height);
|
|
};
|
|
|
|
that.copyImage = function(old_x, old_y, new_x, new_y, width, height) {
|
|
conf.ctx.drawImage(conf.target, old_x, old_y, width, height,
|
|
new_x, new_y, width, height);
|
|
};
|
|
|
|
/*
|
|
* Tile rendering functions optimized for rendering engines.
|
|
*
|
|
* - In Chrome/webkit, Javascript image data array manipulations are
|
|
* faster than direct Canvas fillStyle, fillRect rendering. In
|
|
* gecko, Javascript array handling is much slower.
|
|
*/
|
|
that.getTile = function(x, y, width, height, color) {
|
|
var img, data = [], p, rgb, red, green, blue, j, i;
|
|
img = {'x': x, 'y': y, 'width': width, 'height': height,
|
|
'data': data};
|
|
if (conf.prefer_js) {
|
|
if (conf.true_color) {
|
|
rgb = color;
|
|
} else {
|
|
rgb = conf.colourMap[color[0]];
|
|
}
|
|
red = rgb[0];
|
|
green = rgb[1];
|
|
blue = rgb[2];
|
|
for (i = 0; i < (width * height * 4); i+=4) {
|
|
data[i ] = red;
|
|
data[i + 1] = green;
|
|
data[i + 2] = blue;
|
|
}
|
|
} else {
|
|
that.fillRect(x, y, width, height, color);
|
|
}
|
|
return img;
|
|
};
|
|
|
|
that.setSubTile = function(img, x, y, w, h, color) {
|
|
var data, p, rgb, red, green, blue, width, j, i, xend, yend;
|
|
if (conf.prefer_js) {
|
|
data = img.data;
|
|
width = img.width;
|
|
if (conf.true_color) {
|
|
rgb = color;
|
|
} else {
|
|
rgb = conf.colourMap[color[0]];
|
|
}
|
|
red = rgb[0];
|
|
green = rgb[1];
|
|
blue = rgb[2];
|
|
xend = x + w;
|
|
yend = y + h;
|
|
for (j = y; j < yend; j += 1) {
|
|
for (i = x; i < xend; i += 1) {
|
|
p = (i + (j * width) ) * 4;
|
|
data[p ] = red;
|
|
data[p + 1] = green;
|
|
data[p + 2] = blue;
|
|
}
|
|
}
|
|
} else {
|
|
that.fillRect(img.x + x, img.y + y, w, h, color);
|
|
}
|
|
};
|
|
|
|
that.putTile = function(img) {
|
|
if (conf.prefer_js) {
|
|
that.rgbxImage(img.x, img.y, img.width, img.height, img.data, 0);
|
|
} else {
|
|
// No-op, under gecko already done by setSubTile
|
|
}
|
|
};
|
|
|
|
that.imageDataGet = function(width, height) {
|
|
return conf.ctx.getImageData(0, 0, width, height);
|
|
};
|
|
that.imageDataCreate = function(width, height) {
|
|
return conf.ctx.createImageData(width, height);
|
|
};
|
|
|
|
that.rgbxImageData = function(x, y, width, height, arr, offset) {
|
|
var img, i, j, data;
|
|
img = that.imageData(width, height);
|
|
data = img.data;
|
|
for (i=0, j=offset; i < (width * height * 4); i=i+4, j=j+4) {
|
|
data[i + 0] = arr[j + 0];
|
|
data[i + 1] = arr[j + 1];
|
|
data[i + 2] = arr[j + 2];
|
|
data[i + 3] = 255; // Set Alpha
|
|
}
|
|
conf.ctx.putImageData(img, x, y);
|
|
};
|
|
|
|
// really slow fallback if we don't have imageData
|
|
that.rgbxImageFill = function(x, y, width, height, arr, offset) {
|
|
var i, j, sx = 0, sy = 0;
|
|
for (i=0, j=offset; i < (width * height); i+=1, j+=4) {
|
|
that.fillRect(x+sx, y+sy, 1, 1, [arr[j+0], arr[j+1], arr[j+2]]);
|
|
sx += 1;
|
|
if ((sx % width) === 0) {
|
|
sx = 0;
|
|
sy += 1;
|
|
}
|
|
}
|
|
};
|
|
|
|
that.cmapImageData = function(x, y, width, height, arr, offset) {
|
|
var img, i, j, data, rgb, cmap;
|
|
img = that.imageData(width, height);
|
|
data = img.data;
|
|
cmap = conf.colourMap;
|
|
for (i=0, j=offset; i < (width * height * 4); i+=4, j+=1) {
|
|
rgb = cmap[arr[j]];
|
|
data[i + 0] = rgb[0];
|
|
data[i + 1] = rgb[1];
|
|
data[i + 2] = rgb[2];
|
|
data[i + 3] = 255; // Set Alpha
|
|
}
|
|
conf.ctx.putImageData(img, x, y);
|
|
};
|
|
|
|
that.cmapImageFill = function(x, y, width, height, arr, offset) {
|
|
var i, j, sx = 0, sy = 0, cmap;
|
|
cmap = conf.colourMap;
|
|
for (i=0, j=offset; i < (width * height); i+=1, j+=1) {
|
|
that.fillRect(x+sx, y+sy, 1, 1, [arr[j]]);
|
|
sx += 1;
|
|
if ((sx % width) === 0) {
|
|
sx = 0;
|
|
sy += 1;
|
|
}
|
|
}
|
|
};
|
|
|
|
|
|
that.blitImage = function(x, y, width, height, arr, offset) {
|
|
if (conf.true_color) {
|
|
that.rgbxImage(x, y, width, height, arr, offset);
|
|
} else {
|
|
that.cmapImage(x, y, width, height, arr, offset);
|
|
}
|
|
};
|
|
|
|
that.blitStringImage = function(str, x, y) {
|
|
var img = new Image();
|
|
img.onload = function () { conf.ctx.drawImage(img, x, y); };
|
|
img.src = str;
|
|
};
|
|
|
|
that.changeCursor = function(pixels, mask, hotx, hoty, w, h) {
|
|
var cur = [], cmap, rgb, IHDRsz, ANDsz, XORsz, url, idx, alpha, x, y;
|
|
//Util.Debug(">> changeCursor, x: " + hotx + ", y: " + hoty + ", w: " + w + ", h: " + h);
|
|
|
|
if (conf.cursor_uri === false) {
|
|
Util.Warn("changeCursor called but no cursor data URI support");
|
|
return;
|
|
}
|
|
|
|
// 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 );
|
|
};
|
|
|
|
cmap = conf.colourMap;
|
|
IHDRsz = 40;
|
|
ANDsz = w * h * 4;
|
|
XORsz = Math.ceil( (w * h) / 8.0 );
|
|
|
|
// Main header
|
|
cur.push16le(0); // Reserved
|
|
cur.push16le(2); // .CUR type
|
|
cur.push16le(1); // Number of images, 1 for non-animated ico
|
|
|
|
// Cursor #1 header
|
|
cur.push(w); // width
|
|
cur.push(h); // height
|
|
cur.push(0); // colors, 0 -> true-color
|
|
cur.push(0); // reserved
|
|
cur.push16le(hotx); // hotspot x coordinate
|
|
cur.push16le(hoty); // hotspot y coordinate
|
|
cur.push32le(IHDRsz + XORsz + ANDsz); // cursor data byte size
|
|
cur.push32le(22); // offset of cursor data in the file
|
|
|
|
// Cursor #1 InfoHeader
|
|
cur.push32le(IHDRsz); // Infoheader size
|
|
cur.push32le(w); // Cursor width
|
|
cur.push32le(h*2); // XOR+AND height
|
|
cur.push16le(1); // number of planes
|
|
cur.push16le(32); // bits per pixel
|
|
cur.push32le(0); // Type of compression
|
|
cur.push32le(XORsz + ANDsz); // Size of Image
|
|
cur.push32le(0);
|
|
cur.push32le(0);
|
|
cur.push32le(0);
|
|
cur.push32le(0);
|
|
|
|
// XOR/color data
|
|
for (y = h-1; y >= 0; y -= 1) {
|
|
for (x = 0; x < w; x += 1) {
|
|
idx = y * Math.ceil(w / 8) + Math.floor(x/8);
|
|
alpha = (mask[idx] << (x % 8)) & 0x80 ? 255 : 0;
|
|
|
|
if (conf.true_color) {
|
|
idx = ((w * y) + x) * 4;
|
|
cur.push(pixels[idx + 2]); // blue
|
|
cur.push(pixels[idx + 1]); // green
|
|
cur.push(pixels[idx + 0]); // red
|
|
cur.push(alpha); // red
|
|
} else {
|
|
idx = (w * y) + x;
|
|
rgb = cmap[pixels[idx]];
|
|
cur.push(rgb[2]); // blue
|
|
cur.push(rgb[1]); // green
|
|
cur.push(rgb[0]); // red
|
|
cur.push(alpha); // alpha
|
|
}
|
|
}
|
|
}
|
|
|
|
// AND/bitmask data (ignored, just needs to be right size)
|
|
for (y = 0; y < h; y += 1) {
|
|
for (x = 0; x < Math.ceil(w / 8); x += 1) {
|
|
cur.push(0x00);
|
|
}
|
|
}
|
|
|
|
url = "data:image/x-icon;base64," + Base64.encode(cur);
|
|
conf.target.style.cursor = "url(" + url + ") " + hotx + " " + hoty + ", default";
|
|
//Util.Debug("<< changeCursor, cur.length: " + cur.length);
|
|
};
|
|
|
|
|
|
|
|
return constructor(); // Return the public API interface
|
|
|
|
} // End of Canvas()
|
|
|