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canvas.js
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canvas.js
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/*
* noVNC: HTML5 VNC client
* Copyright (C) 2010 Joel Martin
* Licensed under LGPL-3 (see LICENSE.LGPL-3)
*
* See README.md for usage and integration instructions.
*/
"use strict";
/*jslint white: false, bitwise: false */
/*global window, $, Util, Base64 */
// Globals defined here
var Canvas;
// Everything namespaced inside Canvas
Canvas = {
prefer_js : false, // make private
force_canvas : false, // make private
cursor_uri : true, // make private
true_color : false,
colourMap : [],
c_wx : 0,
c_wy : 0,
ctx : null,
prevStyle: "",
focused : true,
keyPress : null,
mouseButton : null,
mouseMove : null,
onMouseButton: function(e, down) {
var evt, pos, bmask;
if (! Canvas.focused) {
return true;
}
evt = (e ? e : window.event);
pos = Util.getEventPosition(e, $(Canvas.id));
bmask = 1 << evt.button;
//Util.Debug('mouse ' + pos.x + "," + pos.y + " down: " + down + " bmask: " + bmask);
if (Canvas.mouseButton) {
Canvas.mouseButton(pos.x, pos.y, down, bmask);
}
Util.stopEvent(e);
return false;
},
onMouseDown: function (e) {
Canvas.onMouseButton(e, 1);
},
onMouseUp: function (e) {
Canvas.onMouseButton(e, 0);
},
onMouseWheel: function (e) {
var evt, pos, bmask, wheelData;
evt = (e ? e : window.event);
pos = Util.getEventPosition(e, $(Canvas.id));
wheelData = evt.detail ? evt.detail * -1 : evt.wheelDelta / 40;
if (wheelData > 0) {
bmask = 1 << 3;
} else {
bmask = 1 << 4;
}
//Util.Debug('mouse scroll by ' + wheelData + ':' + pos.x + "," + pos.y);
if (Canvas.mouseButton) {
Canvas.mouseButton(pos.x, pos.y, 1, bmask);
Canvas.mouseButton(pos.x, pos.y, 0, bmask);
}
Util.stopEvent(e);
return false;
},
onMouseMove: function (e) {
var evt, pos;
evt = (e ? e : window.event);
pos = Util.getEventPosition(e, $(Canvas.id));
//Util.Debug('mouse ' + evt.which + '/' + evt.button + ' up:' + pos.x + "," + pos.y);
if (Canvas.mouseMove) {
Canvas.mouseMove(pos.x, pos.y);
}
},
onKeyDown: function (e) {
//Util.Debug("keydown: " + Canvas.getKeysym(e));
if (! Canvas.focused) {
return true;
}
if (Canvas.keyPress) {
Canvas.keyPress(Canvas.getKeysym(e), 1);
}
Util.stopEvent(e);
return false;
},
onKeyUp : function (e) {
//Util.Debug("keyup: " + Canvas.getKeysym(e));
if (! Canvas.focused) {
return true;
}
if (Canvas.keyPress) {
Canvas.keyPress(Canvas.getKeysym(e), 0);
}
Util.stopEvent(e);
return false;
},
onMouseDisable: function (e) {
var evt, pos;
if (! Canvas.focused) {
return true;
}
evt = (e ? e : window.event);
pos = Util.getPosition($(Canvas.id));
/* Stop propagation if inside canvas area */
if ((evt.clientX >= pos.x) &&
(evt.clientY >= pos.y) &&
(evt.clientX < (pos.x + Canvas.c_wx)) &&
(evt.clientY < (pos.y + Canvas.c_wy))) {
//Util.Debug("mouse event disabled");
Util.stopEvent(e);
return false;
}
//Util.Debug("mouse event not disabled");
return true;
},
init: function (id) {
var c, imgTest, tval, i, curDat, curSave;
Util.Debug(">> Canvas.init");
Canvas.id = id;
c = $(Canvas.id);
if (! c.getContext) { throw("No getContext method"); }
Canvas.ctx = c.getContext('2d');
Canvas.clear();
/*
* Determine browser Canvas feature support
* and select fastest rendering methods
*/
tval = 0;
Canvas.has_imageData = false;
try {
imgTest = Canvas.ctx.getImageData(0, 0, 1,1);
imgTest.data[0] = 123;
imgTest.data[3] = 255;
Canvas.ctx.putImageData(imgTest, 0, 0);
tval = Canvas.ctx.getImageData(0, 0, 1, 1).data[0];
if (tval === 123) {
Canvas.has_imageData = true;
}
} catch (exc) {}
if (Canvas.has_imageData) {
Util.Info("Canvas supports imageData");
Canvas.force_canvas = false;
if (Canvas.ctx.createImageData) {
// If it's there, it's faster
Util.Info("Using Canvas createImageData");
Canvas._imageData = Canvas._imageDataCreate;
} else if (Canvas.ctx.getImageData) {
Util.Info("Using Canvas getImageData");
Canvas._imageData = Canvas._imageDataGet;
}
Util.Info("Prefering javascript operations");
Canvas.prefer_js = true;
Canvas._rgbxImage = Canvas._rgbxImageData;
Canvas._cmapImage = Canvas._cmapImageData;
} else {
Util.Warn("Canvas lacks imageData, using fillRect (slow)");
Canvas.force_canvas = true;
Canvas.prefer_js = false;
Canvas._rgbxImage = Canvas._rgbxImageFill;
Canvas._cmapImage = Canvas._cmapImageFill;
}
/*
* Determine browser support for setting the cursor via data URI
* scheme
*/
curDat = [];
for (i=0; i < 8 * 8 * 4; i++) {
curDat.push(255);
}
curSave = c.style.cursor;
Canvas.changeCursor(curDat, curDat, 2, 2, 8, 8);
if (c.style.cursor) {
Util.Info("Data URI scheme cursor supported");
} else {
Canvas.cursor_uri = false;
Util.Warn("Data URI scheme cursor not supported");
}
c.style.cursor = curSave;
Canvas.colourMap = [];
Canvas.prevStyle = "";
Canvas.focused = true;
Util.Debug("<< Canvas.init");
return true;
},
start: function (keyPress, mouseButton, mouseMove) {
var c;
Util.Debug(">> Canvas.start");
c = $(Canvas.id);
Canvas.keyPress = keyPress || null;
Canvas.mouseButton = mouseButton || null;
Canvas.mouseMove = mouseMove || null;
Util.addEvent(document, 'keydown', Canvas.onKeyDown);
Util.addEvent(document, 'keyup', Canvas.onKeyUp);
Util.addEvent(c, 'mousedown', Canvas.onMouseDown);
Util.addEvent(c, 'mouseup', Canvas.onMouseUp);
Util.addEvent(c, 'mousemove', Canvas.onMouseMove);
Util.addEvent(c, (Util.Engine.gecko) ? 'DOMMouseScroll' : 'mousewheel',
Canvas.onMouseWheel);
/* Work around right and middle click browser behaviors */
Util.addEvent(document, 'click', Canvas.onMouseDisable);
Util.addEvent(document.body, 'contextmenu', Canvas.onMouseDisable);
Util.Debug("<< Canvas.start");
},
clear: function () {
Canvas.resize(640, 20);
Canvas.ctx.clearRect(0, 0, Canvas.c_wx, Canvas.c_wy);
},
resize: function (width, height, true_color) {
var c = $(Canvas.id);
if (typeof true_color !== "undefined") {
Canvas.true_color = true_color;
}
c.width = width;
c.height = height;
Canvas.c_wx = c.offsetWidth;
Canvas.c_wy = c.offsetHeight;
},
stop: function () {
var c = $(Canvas.id);
Util.removeEvent(document, 'keydown', Canvas.onKeyDown);
Util.removeEvent(document, 'keyup', Canvas.onKeyUp);
Util.removeEvent(c, 'mousedown', Canvas.onMouseDown);
Util.removeEvent(c, 'mouseup', Canvas.onMouseUp);
Util.removeEvent(c, 'mousemove', Canvas.onMouseMove);
Util.removeEvent(c, (Util.Engine.gecko) ? 'DOMMouseScroll' : 'mousewheel',
Canvas.onMouseWheel);
/* Work around right and middle click browser behaviors */
Util.removeEvent(document, 'click', Canvas.onMouseDisable);
Util.removeEvent(document.body, 'contextmenu', Canvas.onMouseDisable);
// Turn off cursor rendering
if (Canvas.cursor_uri) {
c.style.cursor = "default";
}
},
/*
* 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.
*/
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': []};
if (Canvas.prefer_js) {
data = img.data;
if (Canvas.true_color) {
rgb = color;
} else {
rgb = Canvas.colourMap[color[0]];
}
red = rgb[0];
green = rgb[1];
blue = rgb[2];
for (j = 0; j < height; j += 1) {
for (i = 0; i < width; i += 1) {
p = (i + (j * width) ) * 4;
data[p + 0] = red;
data[p + 1] = green;
data[p + 2] = blue;
//data[p + 3] = 255; // Set Alpha
}
}
} else {
Canvas.fillRect(x, y, width, height, color);
}
return img;
},
setSubTile: function(img, x, y, w, h, color) {
var data, p, rgb, red, green, blue, width, j, i;
if (Canvas.prefer_js) {
data = img.data;
width = img.width;
if (Canvas.true_color) {
rgb = color;
} else {
rgb = Canvas.colourMap[color[0]];
}
red = rgb[0];
green = rgb[1];
blue = rgb[2];
for (j = 0; j < h; j += 1) {
for (i = 0; i < w; i += 1) {
p = (x + i + ((y + j) * width) ) * 4;
data[p + 0] = red;
data[p + 1] = green;
data[p + 2] = blue;
//img.data[p + 3] = 255; // Set Alpha
}
}
} else {
Canvas.fillRect(img.x + x, img.y + y, w, h, color);
}
},
putTile: function(img) {
if (Canvas.prefer_js) {
Canvas._rgbxImage(img.x, img.y, img.width, img.height, img.data, 0);
} else {
// No-op, under gecko already done by setSubTile
}
},
_imageDataGet: function(width, height) {
return Canvas.ctx.getImageData(0, 0, width, height);
},
_imageDataCreate: function(width, height) {
return Canvas.ctx.createImageData(width, height);
},
_imageDataRaw: function(width, height) {
return {'data': [], 'width': width, 'height': height};
},
_rgbxImageData: function(x, y, width, height, arr, offset) {
var img, i, j, data;
img = Canvas._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
}
Canvas.ctx.putImageData(img, x, y);
},
// really slow fallback if we don't have imageData
_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) {
Canvas.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;
}
}
},
_cmapImageData: function(x, y, width, height, arr, offset) {
var img, i, j, data, rgb, cmap;
img = Canvas._imageData(width, height);
data = img.data;
cmap = Canvas.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
}
Canvas.ctx.putImageData(img, x, y);
},
_cmapImageFill: function(x, y, width, height, arr, offset) {
var i, j, sx = 0, sy = 0, cmap;
cmap = Canvas.colourMap;
for (i=0, j=offset; i < (width * height); i+=1, j+=1) {
Canvas.fillRect(x+sx, y+sy, 1, 1, [arr[j]]);
sx += 1;
if ((sx % width) === 0) {
sx = 0;
sy += 1;
}
}
},
blitImage: function(x, y, width, height, arr, offset) {
if (Canvas.true_color) {
Canvas._rgbxImage(x, y, width, height, arr, offset);
} else {
Canvas._cmapImage(x, y, width, height, arr, offset);
}
},
blitStringImage: function(str, x, y) {
var img = new Image();
img. () { Canvas.ctx.drawImage(img, x, y); };
img.src = str;
},
setFillColor: function(color) {
var rgb, newStyle;
if (Canvas.true_color) {
rgb = color;
} else {
rgb = Canvas.colourMap[color[0]];
}
if (newStyle !== Canvas.prevStyle) {
newStyle = "rgb(" + rgb[0] + "," + rgb[1] + "," + rgb[2] + ")";
Canvas.ctx.fillStyle = newStyle;
Canvas.prevStyle = newStyle;
}
},
fillRect: function(x, y, width, height, color) {
Canvas.setFillColor(color);
Canvas.ctx.fillRect(x, y, width, height);
},
copyImage: function(old_x, old_y, new_x, new_y, width, height) {
Canvas.ctx.drawImage($(Canvas.id), old_x, old_y, width, height,
new_x, new_y, width, height);
},
/* Translate DOM key event to keysym value */
getKeysym: function(e) {
var evt, keysym;
evt = (e ? e : window.event);
/* Remap modifier and special keys */
switch ( evt.keyCode ) {
case 8 : keysym = 0xFF08; break; // BACKSPACE
case 9 : keysym = 0xFF09; break; // TAB
case 13 : keysym = 0xFF0D; break; // ENTER
case 27 : keysym = 0xFF1B; break; // ESCAPE
case 45 : keysym = 0xFF63; break; // INSERT
case 46 : keysym = 0xFFFF; break; // DELETE
case 36 : keysym = 0xFF50; break; // HOME
case 35 : keysym = 0xFF57; break; // END
case 33 : keysym = 0xFF55; break; // PAGE_UP
case 34 : keysym = 0xFF56; break; // PAGE_DOWN
case 37 : keysym = 0xFF51; break; // LEFT
case 38 : keysym = 0xFF52; break; // UP
case 39 : keysym = 0xFF53; break; // RIGHT
case 40 : keysym = 0xFF54; break; // DOWN
case 112 : keysym = 0xFFBE; break; // F1
case 113 : keysym = 0xFFBF; break; // F2
case 114 : keysym = 0xFFC0; break; // F3
case 115 : keysym = 0xFFC1; break; // F4
case 116 : keysym = 0xFFC2; break; // F5
case 117 : keysym = 0xFFC3; break; // F6
case 118 : keysym = 0xFFC4; break; // F7
case 119 : keysym = 0xFFC5; break; // F8
case 120 : keysym = 0xFFC6; break; // F9
case 121 : keysym = 0xFFC7; break; // F10
case 122 : keysym = 0xFFC8; break; // F11
case 123 : keysym = 0xFFC9; break; // F12
case 16 : keysym = 0xFFE1; break; // SHIFT
case 17 : keysym = 0xFFE3; break; // CONTROL
//case 18 : keysym = 0xFFE7; break; // Left Meta (Mac Option)
case 18 : keysym = 0xFFE9; break; // Left ALT (Mac Command)
default : keysym = evt.keyCode; break;
}
/* Remap symbols */
switch (keysym) {
case 186 : keysym = 59; break; // ; (IE)
case 187 : keysym = 61; break; // = (IE)
case 188 : keysym = 44; break; // , (Mozilla, IE)
case 109 : // - (Mozilla)
if (Util.Engine.gecko) {
keysym = 45; }
break;
case 189 : keysym = 45; break; // - (IE)
case 190 : keysym = 46; break; // . (Mozilla, IE)
case 191 : keysym = 47; break; // / (Mozilla, IE)
case 192 : keysym = 96; break; // ` (Mozilla, IE)
case 219 : keysym = 91; break; // [ (Mozilla, IE)
case 220 : keysym = 92; break; // \ (Mozilla, IE)
case 221 : keysym = 93; break; // ] (Mozilla, IE)
case 222 : keysym = 39; break; // ' (Mozilla, IE)
}
/* Remap shifted and unshifted keys */
if (!!evt.shiftKey) {
switch (keysym) {
case 48 : keysym = 41 ; break; // ) (shifted 0)
case 49 : keysym = 33 ; break; // ! (shifted 1)
case 50 : keysym = 64 ; break; // @ (shifted 2)
case 51 : keysym = 35 ; break; // # (shifted 3)
case 52 : keysym = 36 ; break; // $ (shifted 4)
case 53 : keysym = 37 ; break; // % (shifted 5)
case 54 : keysym = 94 ; break; // ^ (shifted 6)
case 55 : keysym = 38 ; break; // & (shifted 7)
case 56 : keysym = 42 ; break; // * (shifted 8)
case 57 : keysym = 40 ; break; // ( (shifted 9)
case 59 : keysym = 58 ; break; // : (shifted `)
case 61 : keysym = 43 ; break; // + (shifted ;)
case 44 : keysym = 60 ; break; // < (shifted ,)
case 45 : keysym = 95 ; break; // _ (shifted -)
case 46 : keysym = 62 ; break; // > (shifted .)
case 47 : keysym = 63 ; break; // ? (shifted /)
case 96 : keysym = 126; break; // ~ (shifted `)
case 91 : keysym = 123; break; // { (shifted [)
case 92 : keysym = 124; break; // | (shifted \)
case 93 : keysym = 125; break; // } (shifted ])
case 39 : keysym = 34 ; break; // " (shifted ')
}
} else if ((keysym >= 65) && (keysym <=90)) {
/* Remap unshifted A-Z */
keysym += 32;
}
return keysym;
},
isCursor: function() {
return Canvas.cursor_uri;
},
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 (!Canvas.cursor_uri) {
Util.Warn("changeCursor called but no cursor data URI support");
return;
}
cmap = Canvas.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--) {
for (x = 0; x < w; x++) {
idx = y * Math.ceil(w / 8) + Math.floor(x/8);
alpha = (mask[idx] << (x % 8)) & 0x80 ? 255 : 0;
if (Canvas.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++) {
for (x = 0; x < Math.ceil(w / 8); x++) {
cur.push(0x00);
}
}
url = "data:image/x-icon;base64," + Base64.encode(cur);
$(Canvas.id).style.cursor = "url(" + url + ") " + hotx + " " + hoty + ", default";
//Util.Debug("<< changeCursor, cur.length: " + cur.length);
}
};