gtk/gdk/broadway/broadway.js

// Protocol stuff

const BROADWAY_NODE_TEXTURE = 0;
const BROADWAY_NODE_CONTAINER = 1;
const BROADWAY_NODE_COLOR = 2;
const BROADWAY_NODE_BORDER = 3;
const BROADWAY_NODE_OUTSET_SHADOW = 4;
const BROADWAY_NODE_INSET_SHADOW = 5;
const BROADWAY_NODE_ROUNDED_CLIP = 6;
const BROADWAY_NODE_LINEAR_GRADIENT = 7;
const BROADWAY_NODE_SHADOW = 8;
const BROADWAY_NODE_OPACITY = 9;
const BROADWAY_NODE_CLIP = 10;
const BROADWAY_NODE_TRANSFORM = 11;
const BROADWAY_NODE_DEBUG = 12;
const BROADWAY_NODE_REUSE = 13;

const BROADWAY_NODE_OP_INSERT_NODE = 0;
const BROADWAY_NODE_OP_REMOVE_NODE = 1;
const BROADWAY_NODE_OP_MOVE_AFTER_CHILD = 2;
const BROADWAY_NODE_OP_PATCH_TEXTURE = 3;
const BROADWAY_NODE_OP_PATCH_TRANSFORM = 4;

const BROADWAY_OP_GRAB_POINTER = 0;
const BROADWAY_OP_UNGRAB_POINTER = 1;
const BROADWAY_OP_NEW_SURFACE = 2;
const BROADWAY_OP_SHOW_SURFACE = 3;
const BROADWAY_OP_HIDE_SURFACE = 4;
const BROADWAY_OP_RAISE_SURFACE = 5;
const BROADWAY_OP_LOWER_SURFACE = 6;
const BROADWAY_OP_DESTROY_SURFACE = 7;
const BROADWAY_OP_MOVE_RESIZE = 8;
const BROADWAY_OP_SET_TRANSIENT_FOR = 9;
const BROADWAY_OP_DISCONNECTED = 10;
const BROADWAY_OP_SURFACE_UPDATE = 11;
const BROADWAY_OP_SET_SHOW_KEYBOARD = 12;
const BROADWAY_OP_UPLOAD_TEXTURE = 13;
const BROADWAY_OP_RELEASE_TEXTURE = 14;
const BROADWAY_OP_SET_NODES = 15;
const BROADWAY_OP_ROUNDTRIP = 16;

const BROADWAY_EVENT_ENTER = 0;
const BROADWAY_EVENT_LEAVE = 1;
const BROADWAY_EVENT_POINTER_MOVE = 2;
const BROADWAY_EVENT_BUTTON_PRESS = 3;
const BROADWAY_EVENT_BUTTON_RELEASE = 4;
const BROADWAY_EVENT_TOUCH = 5;
const BROADWAY_EVENT_SCROLL = 6;
const BROADWAY_EVENT_KEY_PRESS = 7;
const BROADWAY_EVENT_KEY_RELEASE = 8;
const BROADWAY_EVENT_GRAB_NOTIFY = 9;
const BROADWAY_EVENT_UNGRAB_NOTIFY = 10;
const BROADWAY_EVENT_CONFIGURE_NOTIFY = 11;
const BROADWAY_EVENT_SCREEN_SIZE_CHANGED = 12;
const BROADWAY_EVENT_FOCUS = 13;
const BROADWAY_EVENT_ROUNDTRIP_NOTIFY = 14;

const DISPLAY_OP_REPLACE_CHILD = 0;
const DISPLAY_OP_APPEND_CHILD = 1;
const DISPLAY_OP_INSERT_AFTER_CHILD = 2;
const DISPLAY_OP_APPEND_ROOT = 3;
const DISPLAY_OP_SHOW_SURFACE = 4;
const DISPLAY_OP_HIDE_SURFACE = 5;
const DISPLAY_OP_DELETE_NODE = 6;
const DISPLAY_OP_MOVE_NODE = 7;
const DISPLAY_OP_RESIZE_NODE = 8;
const DISPLAY_OP_RESTACK_SURFACES = 9;
const DISPLAY_OP_DELETE_SURFACE = 10;
const DISPLAY_OP_CHANGE_TEXTURE = 11;
const DISPLAY_OP_CHANGE_TRANSFORM = 12;

// GdkCrossingMode
const GDK_CROSSING_NORMAL = 0;
const GDK_CROSSING_GRAB = 1;
const GDK_CROSSING_UNGRAB = 2;

// GdkModifierType
const GDK_SHIFT_MASK    = 1 << 0;
const GDK_LOCK_MASK     = 1 << 1;
const GDK_CONTROL_MASK  = 1 << 2;
const GDK_ALT_MASK      = 1 << 3;
const GDK_BUTTON1_MASK  = 1 << 8;
const GDK_BUTTON2_MASK  = 1 << 9;
const GDK_BUTTON3_MASK  = 1 << 10;
const GDK_BUTTON4_MASK  = 1 << 11;
const GDK_BUTTON5_MASK  = 1 << 12;
const GDK_SUPER_MASK    = 1 << 26;
const GDK_HYPER_MASK    = 1 << 27;
const GDK_META_MASK     = 1 << 28;


var useDataUrls = window.location.search.includes("datauri");

/* This base64code is based on https://github.com/beatgammit/base64-js/blob/master/index.js which is MIT licensed */

var b64_lookup = [];
var base64_code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
for (var i = 0, len = base64_code.length; i < len; ++i) {
    b64_lookup[i] = base64_code[i];
}

function tripletToBase64 (num) {
    return b64_lookup[num >> 18 & 0x3F] +
        b64_lookup[num >> 12 & 0x3F] +
        b64_lookup[num >> 6 & 0x3F] +
        b64_lookup[num & 0x3F];
}

function encodeBase64Chunk (uint8, start, end) {
    var tmp;
    var output = [];
    for (var i = start; i < end; i += 3) {
        tmp =
            ((uint8[i] << 16) & 0xFF0000) +
            ((uint8[i + 1] << 8) & 0xFF00) +
            (uint8[i + 2] & 0xFF);
        output.push(tripletToBase64(tmp));
    }
    return output.join('');
}

function bytesToDataUri(uint8) {
    var tmp;
    var len = uint8.length;
    var extraBytes = len % 3; // if we have 1 byte left, pad 2 bytes
    var parts = [];
    var maxChunkLength = 16383; // must be multiple of 3

    parts.push("data:image/png;base64,");

    // go through the array every three bytes, we'll deal with trailing stuff later
    for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {
        parts.push(encodeBase64Chunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)));
    }

    // pad the end with zeros, but make sure to not forget the extra bytes
    if (extraBytes === 1) {
        tmp = uint8[len - 1];
        parts.push(b64_lookup[tmp >> 2] + b64_lookup[(tmp << 4) & 0x3F] + '==');
    } else if (extraBytes === 2) {
        tmp = (uint8[len - 2] << 8) + uint8[len - 1];
        parts.push(b64_lookup[tmp >> 10] + b64_lookup[(tmp >> 4) & 0x3F] + b64_lookup[(tmp << 2) & 0x3F] + '=');
    }

    return parts.join('');
}

/* Helper functions for debugging */
var logDiv = null;
function log(str) {
    if (!logDiv) {
        logDiv = document.createElement('pre');
        document.body.appendChild(logDiv);
        logDiv.style["position"] = "absolute";
        logDiv.style["right"] = "0px";
        logDiv.style["font-size"] = "small";
    }
    logDiv.insertBefore(document.createElement('br'), logDiv.firstChild);
    logDiv.insertBefore(document.createTextNode(str), logDiv.firstChild);
}

function getStackTrace()
{
    var callstack = [];
    var isCallstackPopulated = false;
    try {
        i.dont.exist+=0;
    } catch(e) {
        if (e.stack) { // Firefox
            var lines = e.stack.split("\n");
            for (var i=0, len=lines.length; i<len; i++) {
                if (lines[i].match(/^\s*[A-Za-z0-9\-_\$]+\(/)) {
                    callstack.push(lines[i]);
                }
            }
            // Remove call to getStackTrace()
            callstack.shift();
            isCallstackPopulated = true;
        } else if (window.opera && e.message) { // Opera
            var lines = e.message.split("\n");
            for (var i=0, len=lines.length; i<len; i++) {
                if (lines[i].match(/^\s*[A-Za-z0-9\-_\$]+\(/)) {
                    var entry = lines[i];
                    // Append next line also since it has the file info
                    if (lines[i+1]) {
                        entry += " at " + lines[i+1];
                        i++;
                    }
                    callstack.push(entry);
                }
            }
            // Remove call to getStackTrace()
            callstack.shift();
            isCallstackPopulated = true;
        }
    }
    if (!isCallstackPopulated) { //IE and Safari
        var currentFunction = arguments.callee.caller;
        while (currentFunction) {
            var fn = currentFunction.toString();
            var fname = fn.substring(fn.indexOf("function") + 8, fn.indexOf("(")) || "anonymous";
            callstack.push(fname);
            currentFunction = currentFunction.caller;
        }
    }
    return callstack;
}

function logStackTrace(len) {
    var callstack = getStackTrace();
    var end = callstack.length;
    if (len > 0)
        end = Math.min(len + 1, end);
    for (var i = 1; i < end; i++)
        log(callstack[i]);
}

var grab = new Object();
grab.surface = null;
grab.ownerEvents = false;
grab.implicit = false;
var keyDownList = [];
var lastSerial = 0;
var lastX = 0;
var lastY = 0;
var lastState;
var lastTimeStamp = 0;
var realSurfaceWithMouse = 0;
var surfaceWithMouse = 0;
var surfaces = {};
var textures = {};
var stackingOrder = [];
var outstandingCommands = new Array();
var outstandingDisplayCommands = null;
var inputSocket = null;
var debugDecoding = false;
var fakeInput = null;
var showKeyboard = false;
var showKeyboardChanged = false;
var firstTouchDownId = null;

function getButtonMask (button) {
    if (button == 1)
        return GDK_BUTTON1_MASK;
    if (button == 2)
        return GDK_BUTTON2_MASK;
    if (button == 3)
        return GDK_BUTTON3_MASK;
    if (button == 4)
        return GDK_BUTTON4_MASK;
    if (button == 5)
        return GDK_BUTTON5_MASK;
    return 0;
}

function Texture(id, data) {
    var url;
    if (useDataUrls) {
        url = bytesToDataUri(data);
    } else {
        var blob = new Blob([data],{type: "image/png"});
        url = window.URL.createObjectURL(blob);
    }

    this.url = url;
    this.refcount = 1;
    this.id = id;

    var image = new Image();
    image.src = this.url;
    this.image = image;
    this.decoded = image.decode();
    textures[id] = this;
}

Texture.prototype.ref = function() {
    this.refcount += 1;
    return this;
}

Texture.prototype.unref = function() {
    this.refcount -= 1;
    if (this.refcount == 0) {
        if (this.url.startsWith("blob")) {
            window.URL.revokeObjectURL(this.url);
        }
        delete textures[this.id];
    }
}

function sendConfigureNotify(surface)
{
    sendInput(BROADWAY_EVENT_CONFIGURE_NOTIFY, [surface.id, surface.x, surface.y, surface.width, surface.height]);
}

function cmdCreateSurface(id, x, y, width, height)
{
    var surface = { id: id, x: x, y:y, width: width, height: height };
    surface.transientParent = 0;
    surface.visible = false;
    surface.imageData = null;
    surface.nodes = {};

    var div = document.createElement('div');
    div.surface = surface;
    surface.div = div;

    div.style["position"] = "absolute";
    div.style["left"] = surface.x + "px";
    div.style["top"] = surface.y + "px";
    div.style["width"] = surface.width + "px";
    div.style["height"] = surface.height + "px";
    div.style["display"] = "block";
    div.style["visibility"] = "hidden";

    surfaces[id] = surface;
    stackingOrder.push(surface);

    sendConfigureNotify(surface);

    return div;
}

function restackSurfaces() {
    for (var i = 0; i < stackingOrder.length; i++) {
        var surface = stackingOrder[i];
        surface.div.style.zIndex = i;
    }
}

function moveToHelper(surface, position) {
    var i = stackingOrder.indexOf(surface);
    stackingOrder.splice(i, 1);
    if (position != undefined)
        stackingOrder.splice(position, 0, surface);
    else
        stackingOrder.push(surface);

    for (var cid in surfaces) {
        var child = surfaces[cid];
        if (child.transientParent == surface.id)
            moveToHelper(child, stackingOrder.indexOf(surface) + 1);
    }
}

function cmdRoundtrip(id, tag)
{
    sendInput(BROADWAY_EVENT_ROUNDTRIP_NOTIFY, [id, tag]);
}

function cmdRaiseSurface(id)
{
    var surface = surfaces[id];
    if (surface)
        moveToHelper(surface);
}

function cmdLowerSurface(id)
{
    var surface = surfaces[id];
    if (surface)
        moveToHelper(surface, 0);
}

function TransformNodes(node_data, div, nodes, display_commands) {
    this.node_data = node_data;
    this.display_commands = display_commands;
    this.data_pos = 0;
    this.div = div;
    this.outstanding = 1;
    this.nodes = nodes;
}

TransformNodes.prototype.decode_uint32 = function() {
    var v = this.node_data.getUint32(this.data_pos, true);
    this.data_pos += 4;
    return v;
}

TransformNodes.prototype.decode_int32 = function() {
    var v = this.node_data.getInt32(this.data_pos, true);
    this.data_pos += 4;
    return v;
}

TransformNodes.prototype.decode_float = function() {
    var v = this.node_data.getFloat32(this.data_pos, true);
    this.data_pos += 4;
    return v;
}

TransformNodes.prototype.decode_color = function() {
    var rgba = this.decode_uint32();
    var a = (rgba >> 24) & 0xff;
    var r = (rgba >> 16) & 0xff;
    var g = (rgba >> 8) & 0xff;
    var b = (rgba >> 0) & 0xff;
    var c;
    if (a == 0)
        c = "rgb(" + r + "," + g + "," + b + ")";
    else
        c = "rgba(" + r + "," + g + "," + b + "," + (a / 255.0) + ")";
    return c;
}

TransformNodes.prototype.decode_size = function() {
    var s = new Object();
    s.width = this.decode_float ();
    s.height = this.decode_float ();
    return s;
}

TransformNodes.prototype.decode_point = function() {
    var p = new Object();
    p.x = this.decode_float ();
    p.y = this.decode_float ();
    return p;
}

TransformNodes.prototype.decode_rect = function() {
    var r = new Object();
    r.x = this.decode_float ();
    r.y = this.decode_float ();
    r.width = this.decode_float ();
    r.height = this.decode_float ();
    return r;
}

TransformNodes.prototype.decode_irect = function() {
    var r = new Object();
    r.x = this.decode_int32 ();
    r.y = this.decode_int32 ();
    r.width = this.decode_int32 ();
    r.height = this.decode_int32 ();
    return r;
}

TransformNodes.prototype.decode_rounded_rect = function() {
    var r = new Object();
    r.bounds = this.decode_rect();
    r.sizes = [];
    for (var i = 0; i < 4; i++)
        r.sizes[i] = this.decode_size();
    return r;
}

TransformNodes.prototype.decode_color_stop = function() {
    var s = new Object();
    s.offset = this.decode_float ();
    s.color = this.decode_color ();
    return s;
}

TransformNodes.prototype.decode_color_stops = function() {
    var stops = [];
    var len = this.decode_uint32();
    for (var i = 0; i < len; i++)
        stops[i] = this.decode_color_stop();
    return stops;
}

function utf8_to_string(array) {
    var out, i, len, c;
    var char2, char3;

    out = "";
    len = array.length;
    i = 0;
    while(i < len) {
    c = array[i++];
    switch(c >> 4)
        {
        case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
            // 0xxxxxxx
            out += String.fromCharCode(c);
            break;
        case 12: case 13:
            // 110x xxxx   10xx xxxx
            char2 = array[i++];
            out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F));
            break;
        case 14:
            // 1110 xxxx  10xx xxxx  10xx xxxx
            char2 = array[i++];
            char3 = array[i++];
            out += String.fromCharCode(((c & 0x0F) << 12) |
                                       ((char2 & 0x3F) << 6) |
                                       ((char3 & 0x3F) << 0));
            break;
        }
    }

    return out;
}

TransformNodes.prototype.decode_string = function() {
    var len = this.decode_uint32();
    var utf8 = new Array();
    var b;
    for (var i = 0; i < len; i++) {
        if (i % 4 == 0) {
            b = this.decode_uint32();
        }
        utf8[i] = b & 0xff;
        b = b >> 8;
    }

    return utf8_to_string (utf8);
}

TransformNodes.prototype.decode_transform = function() {
    var transform_type = this.decode_uint32();

    if (transform_type == 0) {
        var point = this.decode_point();
        return "translate(" + px(point.x) + "," + px(point.y) + ")";
    } else if (transform_type == 1) {
        var m = new Array();
        for (var i = 0; i < 16; i++) {
            m[i] = this.decode_float ();
        }

        return "matrix3d(" +
            m[0] + "," + m[1] + "," + m[2] + "," + m[3]+ "," +
            m[4] + "," + m[5] + "," + m[6] + "," + m[7] + "," +
            m[8] + "," + m[9] + "," + m[10] + "," + m[11] + "," +
            m[12] + "," + m[13] + "," + m[14] + "," + m[15] + ")";
    } else {
        alert("Unexpected transform type " + transform_type);
    }
}

function args() {
    var argsLength = arguments.length;
    var strings = [];
    for (var i = 0; i < argsLength; ++i)
        strings[i] = arguments[i];

    return strings.join(" ");
}

function px(x) {
    return x + "px";
}

function set_point_style (div, point) {
    div.style["left"] = px(point.x);
    div.style["top"] = px(point.y);
}

function set_rect_style (div, rect) {
    div.style["left"] = px(rect.x);
    div.style["top"] = px(rect.y);
    div.style["width"] = px(rect.width);
    div.style["height"] = px(rect.height);
}

function set_rrect_style (div, rrect) {
    set_rect_style(div, rrect.bounds);
    div.style["border-top-left-radius"] = args(px(rrect.sizes[0].width), px(rrect.sizes[0].height));
    div.style["border-top-right-radius"] = args(px(rrect.sizes[1].width), px(rrect.sizes[1].height));
    div.style["border-bottom-right-radius"] = args(px(rrect.sizes[2].width), px(rrect.sizes[2].height));
    div.style["border-bottom-left-radius"] = args(px(rrect.sizes[3].width), px(rrect.sizes[3].height));
}

TransformNodes.prototype.createDiv = function(id)
{
    var div = document.createElement('div');
    div.node_id = id;
    this.nodes[id] = div;
    return div;
}

TransformNodes.prototype.createImage = function(id)
{
    var image = new Image();
    image.node_id = id;
    this.nodes[id] = image;
    return image;
}

TransformNodes.prototype.insertNode = function(parent, previousSibling, is_toplevel)
{
    var type = this.decode_uint32();
    var id = this.decode_uint32();
    var newNode = null;
    var oldNode = null;

    switch (type)
    {
        /* Reuse divs from last frame */
        case BROADWAY_NODE_REUSE:
        {
            oldNode = this.nodes[id];
        }
        break;
        /* Leaf nodes */

        case BROADWAY_NODE_TEXTURE:
        {
            var rect = this.decode_rect();
            var texture_id = this.decode_uint32();
            var image = this.createImage(id);
            image.width = rect.width;
            image.height = rect.height;
            image.style["position"] = "absolute";
            set_rect_style(image, rect);
            var texture = textures[texture_id].ref();
            image.src = texture.url;
            // Unref blob url when loaded
            image.onload = function() { texture.unref(); };
            newNode = image;
        }
        break;

    case BROADWAY_NODE_COLOR:
        {
            var rect = this.decode_rect();
            var c = this.decode_color ();
            var div = this.createDiv(id);
            div.style["position"] = "absolute";
            set_rect_style(div, rect);
            div.style["background-color"] = c;
            newNode = div;
        }
        break;

    case BROADWAY_NODE_BORDER:
        {
            var rrect = this.decode_rounded_rect();
            var border_widths = [];
            for (var i = 0; i < 4; i++)
                border_widths[i] = this.decode_float();
            var border_colors = [];
            for (var i = 0; i < 4; i++)
                border_colors[i] = this.decode_color();

            var div = this.createDiv(id);
            div.style["position"] = "absolute";
            rrect.bounds.width -= border_widths[1] + border_widths[3];
            rrect.bounds.height -= border_widths[0] + border_widths[2];
            set_rrect_style(div, rrect);
            div.style["border-style"] = "solid";
            div.style["border-top-color"] = border_colors[0];
            div.style["border-top-width"] = px(border_widths[0]);
            div.style["border-right-color"] = border_colors[1];
            div.style["border-right-width"] = px(border_widths[1]);
            div.style["border-bottom-color"] = border_colors[2];
            div.style["border-bottom-width"] = px(border_widths[2]);
            div.style["border-left-color"] = border_colors[3];
            div.style["border-left-width"] = px(border_widths[3]);
            newNode = div;
        }
        break;

    case BROADWAY_NODE_OUTSET_SHADOW:
        {
            var rrect = this.decode_rounded_rect();
            var color = this.decode_color();
            var dx = this.decode_float();
            var dy = this.decode_float();
            var spread = this.decode_float();
            var blur = this.decode_float();

            var div = this.createDiv(id);
            div.style["position"] = "absolute";
            set_rrect_style(div, rrect);
            div.style["box-shadow"] = args(px(dx), px(dy), px(blur), px(spread), color);
            newNode = div;
        }
        break;

    case BROADWAY_NODE_INSET_SHADOW:
        {
            var rrect = this.decode_rounded_rect();
            var color = this.decode_color();
            var dx = this.decode_float();
            var dy = this.decode_float();
            var spread = this.decode_float();
            var blur = this.decode_float();

            var div = this.createDiv(id);
            div.style["position"] = "absolute";
            set_rrect_style(div, rrect);
            div.style["box-shadow"] = args("inset", px(dx), px(dy), px(blur), px(spread), color);
            newNode = div;
        }
        break;


    case BROADWAY_NODE_LINEAR_GRADIENT:
        {
            var rect = this.decode_rect();
            var start = this.decode_point ();
            var end = this.decode_point ();
            var stops = this.decode_color_stops ();
            var div = this.createDiv(id);
            div.style["position"] = "absolute";
            set_rect_style(div, rect);

            // direction:
            var dx = end.x - start.x;
            var dy = end.y - start.y;

            // Angle in css coords (clockwise degrees, up = 0), note that y goes downwards so we have to invert
            var angle = Math.atan2(dx, -dy) * 180.0 / Math.PI;

            // Figure out which corner has offset == 0 in css
            var start_corner_x, start_corner_y;
            if (dx >= 0) // going right
                start_corner_x = rect.x;
            else
                start_corner_x = rect.x + rect.width;
            if (dy >= 0) // going down
                start_corner_y = rect.y;
            else
                start_corner_y = rect.y + rect.height;

            /* project start corner on the line */
            var l2 = dx*dx + dy*dy;
            var l = Math.sqrt(l2);
            var offset = ((start_corner_x - start.x) * dx  + (start_corner_y - start.y) * dy) / l2;

            var gradient = "linear-gradient(" + angle + "deg";
            for (var i = 0; i < stops.length; i++) {
                var stop = stops[i];
                gradient = gradient + ", " + stop.color + " " + px(stop.offset * l - offset);
            }
            gradient = gradient + ")";

            div.style["background-image"] = gradient;
            newNode = div;
        }
        break;


    /* Bin nodes */

    case BROADWAY_NODE_TRANSFORM:
        {
            var transform_string = this.decode_transform();

            var div = this.createDiv(id);
            div.style["transform"] = transform_string;
            div.style["transform-origin"] = "0px 0px";

            this.insertNode(div, null, false);
            newNode = div;
        }
        break;

    case BROADWAY_NODE_CLIP:
        {
            var rect = this.decode_rect();
            var div = this.createDiv(id);
            div.style["position"] = "absolute";
            set_rect_style(div, rect);
            div.style["overflow"] = "hidden";
            this.insertNode(div, null, false);
            newNode = div;
        }
        break;

    case BROADWAY_NODE_ROUNDED_CLIP:
        {
            var rrect = this.decode_rounded_rect();
            var div = this.createDiv(id);
            div.style["position"] = "absolute";
            set_rrect_style(div, rrect);
            div.style["overflow"] = "hidden";
            this.insertNode(div, null, false);
            newNode = div;
        }
        break;

    case BROADWAY_NODE_OPACITY:
        {
            var opacity = this.decode_float();
            var div = this.createDiv(id);
            div.style["position"] = "absolute";
            div.style["left"] = px(0);
            div.style["top"] = px(0);
            div.style["opacity"] = opacity;

            this.insertNode(div, null, false);
            newNode = div;
        }
        break;

    case BROADWAY_NODE_SHADOW:
        {
            var len = this.decode_uint32();
            var filters = "";
            for (var i = 0; i < len; i++) {
                var color = this.decode_color();
                var dx = this.decode_float();
                var dy = this.decode_float();
                var blur = this.decode_float();
                filters = filters + "drop-shadow(" + args (px(dx), px(dy), px(blur), color) + ")";
            }
            var div = this.createDiv(id);
            div.style["position"] = "absolute";
            div.style["left"] = px(0);
            div.style["top"] = px(0);
            div.style["filter"] = filters;

            this.insertNode(div, null, false);
            newNode = div;
        }
        break;

    case 14:  // DEBUG
        {
            var str = this.decode_string();
            var div = this.createDiv(id);
            div.setAttribute('debug', str);
            this.insertNode(div, null, false);
            newNode = div;
        }
        break;

   /* Generic nodes */

    case BROADWAY_NODE_CONTAINER:
        {
            var div = this.createDiv(id);
            var len = this.decode_uint32();
            var lastChild = null;
            for (var i = 0; i < len; i++) {
                lastChild = this.insertNode(div, lastChild, false);
            }
            newNode = div;
        }
        break;

    default:
        alert("Unexpected node type " + type);
    }

    if (newNode) {
        if (is_toplevel)
            this.display_commands.push([DISPLAY_OP_INSERT_AFTER_CHILD, parent, previousSibling, newNode]);
        else // It is safe to display directly because we have not added the toplevel to the document yet
            parent.appendChild(newNode);
        return newNode;
    } else if (oldNode) {
        // This must be delayed until display ops, because it will remove from the old parent
        this.display_commands.push([DISPLAY_OP_INSERT_AFTER_CHILD, parent, previousSibling, oldNode]);
        return oldNode;
    }
}

TransformNodes.prototype.execute = function(display_commands)
{
    var root = this.div;

    while (this.data_pos < this.node_data.byteLength) {
        var op = this.decode_uint32();
        var parentId, parent;

        switch (op) {
        case BROADWAY_NODE_OP_INSERT_NODE:
            parentId = this.decode_uint32();
            if (parentId == 0)
                parent = root;
            else {
                parent = this.nodes[parentId];
                if (parent == null)
                    console.log("Wanted to insert into parent " + parentId + " but it is unknown");
            }

            var previousChildId = this.decode_uint32();
            var previousChild = null;
            if (previousChildId != 0)
                previousChild = this.nodes[previousChildId];
            this.insertNode(parent, previousChild, true);
            break;
        case BROADWAY_NODE_OP_REMOVE_NODE:
            var removeId = this.decode_uint32();
            var remove = this.nodes[removeId];
            delete this.nodes[removeId];
            if (remove == null)
                console.log("Wanted to delete node " + removeId + " but it is unknown");

            this.display_commands.push([DISPLAY_OP_DELETE_NODE, remove]);
            break;
        case BROADWAY_NODE_OP_MOVE_AFTER_CHILD:
            parentId = this.decode_uint32();
            if (parentId == 0)
                parent = root;
            else
                parent = this.nodes[parentId];
            var previousChildId = this.decode_uint32();
            var previousChild = null;
            if (previousChildId != 0)
                previousChild = this.nodes[previousChildId];
            var toMoveId = this.decode_uint32();
            var toMove = this.nodes[toMoveId];
            this.display_commands.push([DISPLAY_OP_INSERT_AFTER_CHILD, parent, previousChild, toMove]);
            break;
        case BROADWAY_NODE_OP_PATCH_TEXTURE:
            var textureNodeId = this.decode_uint32();
            var textureNode = this.nodes[textureNodeId];
            var textureId = this.decode_uint32();
            var texture = textures[textureId].ref();
            this.display_commands.push([DISPLAY_OP_CHANGE_TEXTURE, textureNode, texture]);
            break;
        case BROADWAY_NODE_OP_PATCH_TRANSFORM:
            var transformNodeId = this.decode_uint32();
            var transformNode = this.nodes[transformNodeId];
            var transformString = this.decode_transform();
            this.display_commands.push([DISPLAY_OP_CHANGE_TRANSFORM, transformNode, transformString]);
            break;
        }

    }
}

function cmdGrabPointer(id, ownerEvents)
{
    doGrab(id, ownerEvents, false);
    sendInput (BROADWAY_EVENT_GRAB_NOTIFY, []);
}

function cmdUngrabPointer()
{
    sendInput (BROADWAY_EVENT_UNGRAB_NOTIFY, []);
    if (grab.surface)
        doUngrab();
}

function handleDisplayCommands(display_commands)
{
    var div, parent;
    var len = display_commands.length;
    for (var i = 0; i < len; i++) {
        var cmd = display_commands[i];

        switch (cmd[0]) {
        case DISPLAY_OP_REPLACE_CHILD:
            cmd[1].replaceChild(cmd[2], cmd[3]);
            break;
        case DISPLAY_OP_APPEND_CHILD:
            cmd[1].appendChild(cmd[2]);
            break;
        case DISPLAY_OP_INSERT_AFTER_CHILD:
            parent = cmd[1];
            var afterThis = cmd[2];
            div = cmd[3];
            if (afterThis == null) // First
                parent.insertBefore(div, parent.firstChild);
            else
                parent.insertBefore(div, afterThis.nextSibling);
            break;
        case DISPLAY_OP_APPEND_ROOT:
            document.body.appendChild(cmd[1]);
            break;
        case DISPLAY_OP_SHOW_SURFACE:
            div = cmd[1];
            var xOffset = cmd[2];
            var yOffset = cmd[3];
            div.style["left"] = xOffset + "px";
            div.style["top"] = yOffset + "px";
            div.style["visibility"] = "visible";
            break;
        case DISPLAY_OP_HIDE_SURFACE:
            div = cmd[1];
            div.style["visibility"] = "hidden";
            break;
        case DISPLAY_OP_DELETE_NODE:
            div = cmd[1];
            div.parentNode.removeChild(div);
            break;
        case DISPLAY_OP_MOVE_NODE:
            div = cmd[1];
            div.style["left"] = cmd[2] + "px";
            div.style["top"] = cmd[3] + "px";
            break;
        case DISPLAY_OP_RESIZE_NODE:
            div = cmd[1];
            div.style["width"] = cmd[2] + "px";
            div.style["height"] = cmd[3] + "px";
            break;

        case DISPLAY_OP_RESTACK_SURFACES:
            restackSurfaces();
            break;
        case DISPLAY_OP_DELETE_SURFACE:
            var id = cmd[1];
            delete surfaces[id];
            break;
        case DISPLAY_OP_CHANGE_TEXTURE:
            var image = cmd[1];
            var texture = cmd[2];
            // We need a new closure here to have a separate copy of "texture" for each iteration in the onload callback...
            var block = function(t) {
                image.src = t.url;
                // Unref blob url when loaded
                image.onload = function() { t.unref(); };
            };
            block(texture);
            break;
        case DISPLAY_OP_CHANGE_TRANSFORM:
            var div = cmd[1];
            var transform_string = cmd[2];
            div.style["transform"] = transform_string;
            break;
        default:
            alert("Unknown display op " + command);
        }
    }
}

function handleCommands(cmd, display_commands, new_textures, modified_trees)
{
    var res = true;
    var need_restack = false;

    while (res && cmd.pos < cmd.length) {
        var id, x, y, w, h, q, surface;
        var saved_pos = cmd.pos;
        var command = cmd.get_uint8();
        lastSerial = cmd.get_32();
        switch (command) {
        case BROADWAY_OP_DISCONNECTED:
            alert ("disconnected");
            inputSocket = null;
            break;

        case BROADWAY_OP_NEW_SURFACE:
            id = cmd.get_16();
            x = cmd.get_16s();
            y = cmd.get_16s();
            w = cmd.get_16();
            h = cmd.get_16();
            var div = cmdCreateSurface(id, x, y, w, h);
            display_commands.push([DISPLAY_OP_APPEND_ROOT, div]);
            need_restack = true;
            break;

        case BROADWAY_OP_SHOW_SURFACE:
            id = cmd.get_16();
            surface = surfaces[id];
            if (!surface.visible) {
                surface.visible = true;
                display_commands.push([DISPLAY_OP_SHOW_SURFACE, surface.div, surface.x, surface.y]);
                need_restack = true;
            }
           break;

        case BROADWAY_OP_HIDE_SURFACE:
            id = cmd.get_16();
            if (grab.surface == id)
                doUngrab();
            surface = surfaces[id];
            if (surface.visible) {
                surface.visible = false;
                display_commands.push([DISPLAY_OP_HIDE_SURFACE, surface.div]);
            }
            break;

        case BROADWAY_OP_SET_TRANSIENT_FOR:
            id = cmd.get_16();
            var parentId = cmd.get_16();
            surface = surfaces[id];
            if (surface.transientParent !== parentId) {
                surface.transientParent = parentId;
                if (parentId != 0 && surfaces[parentId]) {
                    moveToHelper(surface, stackingOrder.indexOf(surfaces[parentId])+1);
                }
                need_restack = true;
            }
            break;

        case BROADWAY_OP_DESTROY_SURFACE:
            id = cmd.get_16();

            if (grab.surface == id)
                doUngrab();

            surface = surfaces[id];
            var i = stackingOrder.indexOf(surface);
            if (i >= 0)
                stackingOrder.splice(i, 1);
            var div = surface.div;

            display_commands.push([DISPLAY_OP_DELETE_NODE, div]);
            // We need to delay this until its really deleted because we can still get events to it
            display_commands.push([DISPLAY_OP_DELETE_SURFACE, id]);
            break;

        case BROADWAY_OP_ROUNDTRIP:
            id = cmd.get_16();
            var tag = cmd.get_32();
            cmdRoundtrip(id, tag);
            break;

        case BROADWAY_OP_MOVE_RESIZE:
            id = cmd.get_16();
            var ops = cmd.get_flags();
            var has_pos = ops & 1;
            var has_size = ops & 2;
            surface = surfaces[id];
            if (has_pos) {
                surface.x = cmd.get_16s();
                surface.y = cmd.get_16s();
                display_commands.push([DISPLAY_OP_MOVE_NODE, surface.div, surface.x, surface.y]);
            }
            if (has_size) {
                surface.width = cmd.get_16();
                surface.height = cmd.get_16();
                display_commands.push([DISPLAY_OP_RESIZE_NODE, surface.div, surface.width, surface.height]);

            }
            sendConfigureNotify(surface);
            break;

        case BROADWAY_OP_RAISE_SURFACE:
            id = cmd.get_16();
            cmdRaiseSurface(id);
            need_restack = true;
            break;

        case BROADWAY_OP_LOWER_SURFACE:
            id = cmd.get_16();
            cmdLowerSurface(id);
            need_restack = true;
            break;

        case BROADWAY_OP_UPLOAD_TEXTURE:
            id = cmd.get_32();
            var data = cmd.get_data();
            var texture = new Texture (id, data); // Stores a ref in global textures array
            new_textures.push(texture);
            break;

        case BROADWAY_OP_RELEASE_TEXTURE:
            id = cmd.get_32();
            textures[id].unref();
            break;

        case BROADWAY_OP_SET_NODES:
            id = cmd.get_16();
            if (id in modified_trees) {
                // Can't modify the same dom tree in the same loop, bail out and do the first one
                cmd.pos = saved_pos;
                res = false;
            } else {
                modified_trees[id] = true;

                var node_data = cmd.get_nodes ();
                surface = surfaces[id];
                var transform_nodes = new TransformNodes (node_data, surface.div, surface.nodes, display_commands);
                transform_nodes.execute();
            }
            break;

        case BROADWAY_OP_GRAB_POINTER:
            id = cmd.get_16();
            var ownerEvents = cmd.get_bool ();

            cmdGrabPointer(id, ownerEvents);
            break;

        case BROADWAY_OP_UNGRAB_POINTER:
            cmdUngrabPointer();
            break;

        case BROADWAY_OP_SET_SHOW_KEYBOARD:
            showKeyboard = cmd.get_16() != 0;
            showKeyboardChanged = true;
            break;

        default:
            alert("Unknown op " + command);
        }
    }

    if (need_restack)
        display_commands.push([DISPLAY_OP_RESTACK_SURFACES]);

    return res;
}

function handleOutstandingDisplayCommands()
{
    if (outstandingDisplayCommands) {
        window.requestAnimationFrame(
            function () {
                handleDisplayCommands(outstandingDisplayCommands);
                outstandingDisplayCommands = null;

                if (outstandingCommands.length > 0)
                    setTimeout(handleOutstanding);
            });
    } else {
        if (outstandingCommands.length > 0)
            handleOutstanding ();
    }
}

/* Mode of operation.
 * We run all outstandingCommands, until either we run out of things
 * to process, or we update the dom nodes of the same surface twice.
 * Then we wait for all textures to load, and then we request am
 * animation frame and apply the display changes. Then we loop back and
 * handle outstanding commands again.
 *
 * The reason for stopping if we update the same tree twice is that
 * the delta operations generally assume that the previous dom tree
 * is in pristine condition.
 */
function handleOutstanding()
{
    var display_commands = new Array();
    var new_textures = new Array();
    var modified_trees = {};

    if (outstandingDisplayCommands != null)
        return;

    while (outstandingCommands.length > 0) {
        var cmd = outstandingCommands.shift();
        if (!handleCommands(cmd, display_commands, new_textures, modified_trees)) {
            outstandingCommands.unshift(cmd);
            break;
        }
    }

    if (display_commands.length > 0)
        outstandingDisplayCommands = display_commands;

    if (new_textures.length > 0) {
        var decodes = [];
        for (var i = 0; i < new_textures.length; i++) {
            decodes.push(new_textures[i].decoded);
        }
        Promise.allSettled(decodes).then(
            () => {
                handleOutstandingDisplayCommands();
            });
    } else {
        handleOutstandingDisplayCommands();
    }

}

function BinCommands(message) {
    this.arraybuffer = message;
    this.dataview = new DataView(message);
    this.length = this.arraybuffer.byteLength;
    this.pos = 0;
}

BinCommands.prototype.get_uint8 = function() {
    return this.dataview.getUint8(this.pos++);
};
BinCommands.prototype.get_bool = function() {
    return this.dataview.getUint8(this.pos++) != 0;
};
BinCommands.prototype.get_flags = function() {
    return this.dataview.getUint8(this.pos++);
}
BinCommands.prototype.get_16 = function() {
    var v = this.dataview.getUint16(this.pos, true);
    this.pos = this.pos + 2;
    return v;
};
BinCommands.prototype.get_16s = function() {
    var v = this.dataview.getInt16(this.pos, true);
    this.pos = this.pos + 2;
    return v;
};
BinCommands.prototype.get_32 = function() {
    var v = this.dataview.getUint32(this.pos, true);
    this.pos = this.pos + 4;
    return v;
};
BinCommands.prototype.get_nodes = function() {
    var len = this.get_32();
    var node_data = new DataView(this.arraybuffer, this.pos, len * 4);
    this.pos = this.pos + len * 4;
    return node_data;
};
BinCommands.prototype.get_data = function() {
    var size = this.get_32();
    var data = new Uint8Array (this.arraybuffer, this.pos, size);
    this.pos = this.pos + size;
    return data;
};

var active = false;
function handleMessage(message)
{
    if (!active) {
        start();
        active = true;
    }

    var cmd = new BinCommands(message);
    outstandingCommands.push(cmd);
    if (outstandingCommands.length == 1) {
        handleOutstanding();
    }
}

function getSurfaceId(ev) {
    var target = ev.target;
    while (target.surface == undefined) {
        if (target == document)
            return 0;
        target = target.parentNode;
    }

    return target.surface.id;
}

function sendInput(cmd, args)
{
    if (inputSocket == null)
        return;

    var fullArgs = [cmd, lastSerial, lastTimeStamp].concat(args);
    var buffer = new ArrayBuffer(fullArgs.length * 4);
    var view = new DataView(buffer);
    fullArgs.forEach(function(arg, i) {
        view.setInt32(i*4, arg, false);
    });

    inputSocket.send(buffer);
}

function getPositionsFromAbsCoord(absX, absY, relativeId) {
    var res = Object();

    res.rootX = absX;
    res.rootY = absY;
    res.winX = absX;
    res.winY = absY;
    if (relativeId != 0) {
        var surface = surfaces[relativeId];
        res.winX = res.winX - surface.x;
        res.winY = res.winY - surface.y;
    }

    return res;
}

function getPositionsFromEvent(ev, relativeId) {
    var absX, absY;
    absX = ev.pageX;
    absY = ev.pageY;
    var res = getPositionsFromAbsCoord(absX, absY, relativeId);

    lastX = res.rootX;
    lastY = res.rootY;

    return res;
}

function getEffectiveEventTarget (id) {
    if (grab.surface != null) {
        if (!grab.ownerEvents)
            return grab.surface;
        if (id == 0)
            return grab.surface;
    }
    return id;
}

function updateKeyboardStatus() {
    if (fakeInput != null && showKeyboardChanged) {
        showKeyboardChanged = false;
        if (showKeyboard)
            fakeInput.focus();
        else
            fakeInput.blur();
    }
}

function updateForEvent(ev) {
    lastState &= ~(GDK_SHIFT_MASK|GDK_CONTROL_MASK|GDK_ALT_MASK);
    if (ev.shiftKey)
        lastState |= GDK_SHIFT_MASK;
    if (ev.ctrlKey)
        lastState |= GDK_CONTROL_MASK;
    if (ev.altKey)
        lastState |= GDK_ALT_MASK;

    lastTimeStamp = ev.timeStamp;
}

function onMouseMove (ev) {
    updateForEvent(ev);
    var id = getSurfaceId(ev);
    id = getEffectiveEventTarget (id);
    var pos = getPositionsFromEvent(ev, id);
    sendInput (BROADWAY_EVENT_POINTER_MOVE, [realSurfaceWithMouse, id, pos.rootX, pos.rootY, pos.winX, pos.winY, lastState]);
}

function onMouseOver (ev) {
    updateForEvent(ev);

    var id = getSurfaceId(ev);
    realSurfaceWithMouse = id;
    id = getEffectiveEventTarget (id);
    var pos = getPositionsFromEvent(ev, id);
    surfaceWithMouse = id;
    if (surfaceWithMouse != 0) {
        sendInput (BROADWAY_EVENT_ENTER, [realSurfaceWithMouse, id, pos.rootX, pos.rootY, pos.winX, pos.winY, lastState, GDK_CROSSING_NORMAL]);
    }
}

function onMouseOut (ev) {
    updateForEvent(ev);
    var id = getSurfaceId(ev);
    var origId = id;
    id = getEffectiveEventTarget (id);
    var pos = getPositionsFromEvent(ev, id);

    if (id != 0) {
        sendInput (BROADWAY_EVENT_LEAVE, [realSurfaceWithMouse, id, pos.rootX, pos.rootY, pos.winX, pos.winY, lastState, GDK_CROSSING_NORMAL]);
    }
    realSurfaceWithMouse = 0;
    surfaceWithMouse = 0;
}

function doGrab(id, ownerEvents, implicit) {
    var pos;

    if (surfaceWithMouse != id) {
        if (surfaceWithMouse != 0) {
            pos = getPositionsFromAbsCoord(lastX, lastY, surfaceWithMouse);
            sendInput (BROADWAY_EVENT_LEAVE, [realSurfaceWithMouse, surfaceWithMouse, pos.rootX, pos.rootY, pos.winX, pos.winY, lastState, GDK_CROSSING_GRAB]);
        }
        pos = getPositionsFromAbsCoord(lastX, lastY, id);
        sendInput (BROADWAY_EVENT_ENTER, [realSurfaceWithMouse, id, pos.rootX, pos.rootY, pos.winX, pos.winY, lastState, GDK_CROSSING_GRAB]);
        surfaceWithMouse = id;
    }

    grab.surface = id;
    grab.ownerEvents = ownerEvents;
    grab.implicit = implicit;
}

function doUngrab() {
    var pos;
    if (realSurfaceWithMouse != surfaceWithMouse) {
        if (surfaceWithMouse != 0) {
            pos = getPositionsFromAbsCoord(lastX, lastY, surfaceWithMouse);
            sendInput (BROADWAY_EVENT_LEAVE, [realSurfaceWithMouse, surfaceWithMouse, pos.rootX, pos.rootY, pos.winX, pos.winY, lastState, GDK_CROSSING_UNGRAB]);
        }
        if (realSurfaceWithMouse != 0) {
            pos = getPositionsFromAbsCoord(lastX, lastY, realSurfaceWithMouse);
            sendInput (BROADWAY_EVENT_ENTER, [realSurfaceWithMouse, realSurfaceWithMouse, pos.rootX, pos.rootY, pos.winX, pos.winY, lastState, GDK_CROSSING_UNGRAB]);
        }
        surfaceWithMouse = realSurfaceWithMouse;
    }
    grab.surface = null;
}

function onMouseDown (ev) {
    updateForEvent(ev);
    var button = ev.button + 1;
    lastState = lastState | getButtonMask (button);
    var id = getSurfaceId(ev);
    id = getEffectiveEventTarget (id);

    var pos = getPositionsFromEvent(ev, id);
    if (grab.surface == null)
        doGrab (id, false, true);
    sendInput (BROADWAY_EVENT_BUTTON_PRESS, [realSurfaceWithMouse, id, pos.rootX, pos.rootY, pos.winX, pos.winY, lastState, button]);
    return false;
}

function onMouseUp (ev) {
    updateForEvent(ev);
    var button = ev.button + 1;
    lastState = lastState & ~getButtonMask (button);
    var evId = getSurfaceId(ev);
    id = getEffectiveEventTarget (evId);
    var pos = getPositionsFromEvent(ev, id);

    sendInput (BROADWAY_EVENT_BUTTON_RELEASE, [realSurfaceWithMouse, id, pos.rootX, pos.rootY, pos.winX, pos.winY, lastState, button]);

    if (grab.surface != null && grab.implicit)
        doUngrab();

    return false;
}

/* Some of the keyboard handling code is from noVNC and
 * (c) Joel Martin (github@martintribe.org), used with permission
 *  Original code at:
 * https://github.com/kanaka/noVNC/blob/master/include/input.js
 */

var unicodeTable = {
    0x0104: 0x01a1,
    0x02D8: 0x01a2,
    0x0141: 0x01a3,
    0x013D: 0x01a5,
    0x015A: 0x01a6,
    0x0160: 0x01a9,
    0x015E: 0x01aa,
    0x0164: 0x01ab,
    0x0179: 0x01ac,
    0x017D: 0x01ae,
    0x017B: 0x01af,
    0x0105: 0x01b1,
    0x02DB: 0x01b2,
    0x0142: 0x01b3,
    0x013E: 0x01b5,
    0x015B: 0x01b6,
    0x02C7: 0x01b7,
    0x0161: 0x01b9,
    0x015F: 0x01ba,
    0x0165: 0x01bb,
    0x017A: 0x01bc,
    0x02DD: 0x01bd,
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    0x1E0A: 0x1001e0a,
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    0x1E82: 0x1001e82,
    0x1E0B: 0x1001e0b,
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    0x1E85: 0x1001e85,
    0x1E61: 0x1001e61,
    0x0174: 0x1000174,
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    0x0176: 0x1000176,
    0x0175: 0x1000175,
    0x1E6B: 0x1001e6b,
    0x0177: 0x1000177,
    0x0152: 0x13bc,
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    0x06F0: 0x10006f0,
    0x06F1: 0x10006f1,
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    0x06F3: 0x10006f3,
    0x06F4: 0x10006f4,
    0x06F5: 0x10006f5,
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    0x0679: 0x1000679,
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    0x0691: 0x1000691,
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    0x0665: 0x1000665,
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    0x23BB: 0x09f0,
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    0x2524: 0x09f5,
    0x2534: 0x09f6,
    0x252C: 0x09f7,
    0x2502: 0x09f8,
    0x2003: 0x0aa1,
    0x2002: 0x0aa2,
    0x2004: 0x0aa3,
    0x2005: 0x0aa4,
    0x2007: 0x0aa5,
    0x2008: 0x0aa6,
    0x2009: 0x0aa7,
    0x200A: 0x0aa8,
    0x2014: 0x0aa9,
    0x2013: 0x0aaa,
    0x2026: 0x0aae,
    0x2025: 0x0aaf,
    0x2153: 0x0ab0,
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    0x2012: 0x0abb,
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    0x215D: 0x0ac5,
    0x215E: 0x0ac6,
    0x2122: 0x0ac9,
    0x2018: 0x0ad0,
    0x2019: 0x0ad1,
    0x201C: 0x0ad2,
    0x201D: 0x0ad3,
    0x211E: 0x0ad4,
    0x2032: 0x0ad6,
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    0x2663: 0x0aec,
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    0x2720: 0x0af0,
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    0x2315: 0x0afa,
    0x2117: 0x0afb,
    0x2038: 0x0afc,
    0x201A: 0x0afd,
    0x201E: 0x0afe,
    0x22A4: 0x0bc2,
    0x230A: 0x0bc4,
    0x2218: 0x0bca,
    0x2395: 0x0bcc,
    0x22A5: 0x0bce,
    0x25CB: 0x0bcf,
    0x2308: 0x0bd3,
    0x22A3: 0x0bdc,
    0x22A2: 0x0bfc,
    0x2017: 0x0cdf,
    0x05D0: 0x0ce0,
    0x05D1: 0x0ce1,
    0x05D2: 0x0ce2,
    0x05D3: 0x0ce3,
    0x05D4: 0x0ce4,
    0x05D5: 0x0ce5,
    0x05D6: 0x0ce6,
    0x05D7: 0x0ce7,
    0x05D8: 0x0ce8,
    0x05D9: 0x0ce9,
    0x05DA: 0x0cea,
    0x05DB: 0x0ceb,
    0x05DC: 0x0cec,
    0x05DD: 0x0ced,
    0x05DE: 0x0cee,
    0x05DF: 0x0cef,
    0x05E0: 0x0cf0,
    0x05E1: 0x0cf1,
    0x05E2: 0x0cf2,
    0x05E3: 0x0cf3,
    0x05E4: 0x0cf4,
    0x05E5: 0x0cf5,
    0x05E6: 0x0cf6,
    0x05E7: 0x0cf7,
    0x05E8: 0x0cf8,
    0x05E9: 0x0cf9,
    0x05EA: 0x0cfa,
    0x0E01: 0x0da1,
    0x0E02: 0x0da2,
    0x0E03: 0x0da3,
    0x0E04: 0x0da4,
    0x0E05: 0x0da5,
    0x0E06: 0x0da6,
    0x0E07: 0x0da7,
    0x0E08: 0x0da8,
    0x0E09: 0x0da9,
    0x0E0A: 0x0daa,
    0x0E0B: 0x0dab,
    0x0E0C: 0x0dac,
    0x0E0D: 0x0dad,
    0x0E0E: 0x0dae,
    0x0E0F: 0x0daf,
    0x0E10: 0x0db0,
    0x0E11: 0x0db1,
    0x0E12: 0x0db2,
    0x0E13: 0x0db3,
    0x0E14: 0x0db4,
    0x0E15: 0x0db5,
    0x0E16: 0x0db6,
    0x0E17: 0x0db7,
    0x0E18: 0x0db8,
    0x0E19: 0x0db9,
    0x0E1A: 0x0dba,
    0x0E1B: 0x0dbb,
    0x0E1C: 0x0dbc,
    0x0E1D: 0x0dbd,
    0x0E1E: 0x0dbe,
    0x0E1F: 0x0dbf,
    0x0E20: 0x0dc0,
    0x0E21: 0x0dc1,
    0x0E22: 0x0dc2,
    0x0E23: 0x0dc3,
    0x0E24: 0x0dc4,
    0x0E25: 0x0dc5,
    0x0E26: 0x0dc6,
    0x0E27: 0x0dc7,
    0x0E28: 0x0dc8,
    0x0E29: 0x0dc9,
    0x0E2A: 0x0dca,
    0x0E2B: 0x0dcb,
    0x0E2C: 0x0dcc,
    0x0E2D: 0x0dcd,
    0x0E2E: 0x0dce,
    0x0E2F: 0x0dcf,
    0x0E30: 0x0dd0,
    0x0E31: 0x0dd1,
    0x0E32: 0x0dd2,
    0x0E33: 0x0dd3,
    0x0E34: 0x0dd4,
    0x0E35: 0x0dd5,
    0x0E36: 0x0dd6,
    0x0E37: 0x0dd7,
    0x0E38: 0x0dd8,
    0x0E39: 0x0dd9,
    0x0E3A: 0x0dda,
    0x0E3F: 0x0ddf,
    0x0E40: 0x0de0,
    0x0E41: 0x0de1,
    0x0E42: 0x0de2,
    0x0E43: 0x0de3,
    0x0E44: 0x0de4,
    0x0E45: 0x0de5,
    0x0E46: 0x0de6,
    0x0E47: 0x0de7,
    0x0E48: 0x0de8,
    0x0E49: 0x0de9,
    0x0E4A: 0x0dea,
    0x0E4B: 0x0deb,
    0x0E4C: 0x0dec,
    0x0E4D: 0x0ded,
    0x0E50: 0x0df0,
    0x0E51: 0x0df1,
    0x0E52: 0x0df2,
    0x0E53: 0x0df3,
    0x0E54: 0x0df4,
    0x0E55: 0x0df5,
    0x0E56: 0x0df6,
    0x0E57: 0x0df7,
    0x0E58: 0x0df8,
    0x0E59: 0x0df9,
    0x0587: 0x1000587,
    0x0589: 0x1000589,
    0x055D: 0x100055d,
    0x058A: 0x100058a,
    0x055C: 0x100055c,
    0x055B: 0x100055b,
    0x055E: 0x100055e,
    0x0531: 0x1000531,
    0x0561: 0x1000561,
    0x0532: 0x1000532,
    0x0562: 0x1000562,
    0x0533: 0x1000533,
    0x0563: 0x1000563,
    0x0534: 0x1000534,
    0x0564: 0x1000564,
    0x0535: 0x1000535,
    0x0565: 0x1000565,
    0x0536: 0x1000536,
    0x0566: 0x1000566,
    0x0537: 0x1000537,
    0x0567: 0x1000567,
    0x0538: 0x1000538,
    0x0568: 0x1000568,
    0x0539: 0x1000539,
    0x0569: 0x1000569,
    0x053A: 0x100053a,
    0x056A: 0x100056a,
    0x053B: 0x100053b,
    0x056B: 0x100056b,
    0x053C: 0x100053c,
    0x056C: 0x100056c,
    0x053D: 0x100053d,
    0x056D: 0x100056d,
    0x053E: 0x100053e,
    0x056E: 0x100056e,
    0x053F: 0x100053f,
    0x056F: 0x100056f,
    0x0540: 0x1000540,
    0x0570: 0x1000570,
    0x0541: 0x1000541,
    0x0571: 0x1000571,
    0x0542: 0x1000542,
    0x0572: 0x1000572,
    0x0543: 0x1000543,
    0x0573: 0x1000573,
    0x0544: 0x1000544,
    0x0574: 0x1000574,
    0x0545: 0x1000545,
    0x0575: 0x1000575,
    0x0546: 0x1000546,
    0x0576: 0x1000576,
    0x0547: 0x1000547,
    0x0577: 0x1000577,
    0x0548: 0x1000548,
    0x0578: 0x1000578,
    0x0549: 0x1000549,
    0x0579: 0x1000579,
    0x054A: 0x100054a,
    0x057A: 0x100057a,
    0x054B: 0x100054b,
    0x057B: 0x100057b,
    0x054C: 0x100054c,
    0x057C: 0x100057c,
    0x054D: 0x100054d,
    0x057D: 0x100057d,
    0x054E: 0x100054e,
    0x057E: 0x100057e,
    0x054F: 0x100054f,
    0x057F: 0x100057f,
    0x0550: 0x1000550,
    0x0580: 0x1000580,
    0x0551: 0x1000551,
    0x0581: 0x1000581,
    0x0552: 0x1000552,
    0x0582: 0x1000582,
    0x0553: 0x1000553,
    0x0583: 0x1000583,
    0x0554: 0x1000554,
    0x0584: 0x1000584,
    0x0555: 0x1000555,
    0x0585: 0x1000585,
    0x0556: 0x1000556,
    0x0586: 0x1000586,
    0x055A: 0x100055a,
    0x10D0: 0x10010d0,
    0x10D1: 0x10010d1,
    0x10D2: 0x10010d2,
    0x10D3: 0x10010d3,
    0x10D4: 0x10010d4,
    0x10D5: 0x10010d5,
    0x10D6: 0x10010d6,
    0x10D7: 0x10010d7,
    0x10D8: 0x10010d8,
    0x10D9: 0x10010d9,
    0x10DA: 0x10010da,
    0x10DB: 0x10010db,
    0x10DC: 0x10010dc,
    0x10DD: 0x10010dd,
    0x10DE: 0x10010de,
    0x10DF: 0x10010df,
    0x10E0: 0x10010e0,
    0x10E1: 0x10010e1,
    0x10E2: 0x10010e2,
    0x10E3: 0x10010e3,
    0x10E4: 0x10010e4,
    0x10E5: 0x10010e5,
    0x10E6: 0x10010e6,
    0x10E7: 0x10010e7,
    0x10E8: 0x10010e8,
    0x10E9: 0x10010e9,
    0x10EA: 0x10010ea,
    0x10EB: 0x10010eb,
    0x10EC: 0x10010ec,
    0x10ED: 0x10010ed,
    0x10EE: 0x10010ee,
    0x10EF: 0x10010ef,
    0x10F0: 0x10010f0,
    0x10F1: 0x10010f1,
    0x10F2: 0x10010f2,
    0x10F3: 0x10010f3,
    0x10F4: 0x10010f4,
    0x10F5: 0x10010f5,
    0x10F6: 0x10010f6,
    0x1E8A: 0x1001e8a,
    0x012C: 0x100012c,
    0x01B5: 0x10001b5,
    0x01E6: 0x10001e6,
    0x01D2: 0x10001d1,
    0x019F: 0x100019f,
    0x1E8B: 0x1001e8b,
    0x012D: 0x100012d,
    0x01B6: 0x10001b6,
    0x01E7: 0x10001e7,
    0x01D2: 0x10001d2,
    0x0275: 0x1000275,
    0x018F: 0x100018f,
    0x0259: 0x1000259,
    0x1E36: 0x1001e36,
    0x1E37: 0x1001e37,
    0x1EA0: 0x1001ea0,
    0x1EA1: 0x1001ea1,
    0x1EA2: 0x1001ea2,
    0x1EA3: 0x1001ea3,
    0x1EA4: 0x1001ea4,
    0x1EA5: 0x1001ea5,
    0x1EA6: 0x1001ea6,
    0x1EA7: 0x1001ea7,
    0x1EA8: 0x1001ea8,
    0x1EA9: 0x1001ea9,
    0x1EAA: 0x1001eaa,
    0x1EAB: 0x1001eab,
    0x1EAC: 0x1001eac,
    0x1EAD: 0x1001ead,
    0x1EAE: 0x1001eae,
    0x1EAF: 0x1001eaf,
    0x1EB0: 0x1001eb0,
    0x1EB1: 0x1001eb1,
    0x1EB2: 0x1001eb2,
    0x1EB3: 0x1001eb3,
    0x1EB4: 0x1001eb4,
    0x1EB5: 0x1001eb5,
    0x1EB6: 0x1001eb6,
    0x1EB7: 0x1001eb7,
    0x1EB8: 0x1001eb8,
    0x1EB9: 0x1001eb9,
    0x1EBA: 0x1001eba,
    0x1EBB: 0x1001ebb,
    0x1EBC: 0x1001ebc,
    0x1EBD: 0x1001ebd,
    0x1EBE: 0x1001ebe,
    0x1EBF: 0x1001ebf,
    0x1EC0: 0x1001ec0,
    0x1EC1: 0x1001ec1,
    0x1EC2: 0x1001ec2,
    0x1EC3: 0x1001ec3,
    0x1EC4: 0x1001ec4,
    0x1EC5: 0x1001ec5,
    0x1EC6: 0x1001ec6,
    0x1EC7: 0x1001ec7,
    0x1EC8: 0x1001ec8,
    0x1EC9: 0x1001ec9,
    0x1ECA: 0x1001eca,
    0x1ECB: 0x1001ecb,
    0x1ECC: 0x1001ecc,
    0x1ECD: 0x1001ecd,
    0x1ECE: 0x1001ece,
    0x1ECF: 0x1001ecf,
    0x1ED0: 0x1001ed0,
    0x1ED1: 0x1001ed1,
    0x1ED2: 0x1001ed2,
    0x1ED3: 0x1001ed3,
    0x1ED4: 0x1001ed4,
    0x1ED5: 0x1001ed5,
    0x1ED6: 0x1001ed6,
    0x1ED7: 0x1001ed7,
    0x1ED8: 0x1001ed8,
    0x1ED9: 0x1001ed9,
    0x1EDA: 0x1001eda,
    0x1EDB: 0x1001edb,
    0x1EDC: 0x1001edc,
    0x1EDD: 0x1001edd,
    0x1EDE: 0x1001ede,
    0x1EDF: 0x1001edf,
    0x1EE0: 0x1001ee0,
    0x1EE1: 0x1001ee1,
    0x1EE2: 0x1001ee2,
    0x1EE3: 0x1001ee3,
    0x1EE4: 0x1001ee4,
    0x1EE5: 0x1001ee5,
    0x1EE6: 0x1001ee6,
    0x1EE7: 0x1001ee7,
    0x1EE8: 0x1001ee8,
    0x1EE9: 0x1001ee9,
    0x1EEA: 0x1001eea,
    0x1EEB: 0x1001eeb,
    0x1EEC: 0x1001eec,
    0x1EED: 0x1001eed,
    0x1EEE: 0x1001eee,
    0x1EEF: 0x1001eef,
    0x1EF0: 0x1001ef0,
    0x1EF1: 0x1001ef1,
    0x1EF4: 0x1001ef4,
    0x1EF5: 0x1001ef5,
    0x1EF6: 0x1001ef6,
    0x1EF7: 0x1001ef7,
    0x1EF8: 0x1001ef8,
    0x1EF9: 0x1001ef9,
    0x01A0: 0x10001a0,
    0x01A1: 0x10001a1,
    0x01AF: 0x10001af,
    0x01B0: 0x10001b0,
    0x20A0: 0x10020a0,
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    0x20A2: 0x10020a2,
    0x20A3: 0x10020a3,
    0x20A4: 0x10020a4,
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    0x20A7: 0x10020a7,
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    0x20AA: 0x10020aa,
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    0x20AC: 0x20ac,
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    0x2202: 0x1002202,
    0x2205: 0x1002205,
    0x2208: 0x1002208,
    0x2209: 0x1002209,
    0x220B: 0x100220B,
    0x221A: 0x100221A,
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    0x221C: 0x100221C,
    0x222C: 0x100222C,
    0x222D: 0x100222D,
    0x2235: 0x1002235,
    0x2245: 0x1002248,
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    0x2262: 0x1002262,
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    0x2800: 0x1002800,
    0x2801: 0x1002801,
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    0x2827: 0x1002827,
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    0x2830: 0x1002830,
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    0x2833: 0x1002833,
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    0x2843: 0x1002843,
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    0x288c: 0x100288c,
    0x288d: 0x100288d,
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    0x2890: 0x1002890,
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    0x2894: 0x1002894,
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    0x2897: 0x1002897,
    0x2898: 0x1002898,
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    0x289a: 0x100289a,
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    0x289c: 0x100289c,
    0x289d: 0x100289d,
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    0x28a0: 0x10028a0,
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    0x28a2: 0x10028a2,
    0x28a3: 0x10028a3,
    0x28a4: 0x10028a4,
    0x28a5: 0x10028a5,
    0x28a6: 0x10028a6,
    0x28a7: 0x10028a7,
    0x28a8: 0x10028a8,
    0x28a9: 0x10028a9,
    0x28aa: 0x10028aa,
    0x28ab: 0x10028ab,
    0x28ac: 0x10028ac,
    0x28ad: 0x10028ad,
    0x28ae: 0x10028ae,
    0x28af: 0x10028af,
    0x28b0: 0x10028b0,
    0x28b1: 0x10028b1,
    0x28b2: 0x10028b2,
    0x28b3: 0x10028b3,
    0x28b4: 0x10028b4,
    0x28b5: 0x10028b5,
    0x28b6: 0x10028b6,
    0x28b7: 0x10028b7,
    0x28b8: 0x10028b8,
    0x28b9: 0x10028b9,
    0x28ba: 0x10028ba,
    0x28bb: 0x10028bb,
    0x28bc: 0x10028bc,
    0x28bd: 0x10028bd,
    0x28be: 0x10028be,
    0x28bf: 0x10028bf,
    0x28c0: 0x10028c0,
    0x28c1: 0x10028c1,
    0x28c2: 0x10028c2,
    0x28c3: 0x10028c3,
    0x28c4: 0x10028c4,
    0x28c5: 0x10028c5,
    0x28c6: 0x10028c6,
    0x28c7: 0x10028c7,
    0x28c8: 0x10028c8,
    0x28c9: 0x10028c9,
    0x28ca: 0x10028ca,
    0x28cb: 0x10028cb,
    0x28cc: 0x10028cc,
    0x28cd: 0x10028cd,
    0x28ce: 0x10028ce,
    0x28cf: 0x10028cf,
    0x28d0: 0x10028d0,
    0x28d1: 0x10028d1,
    0x28d2: 0x10028d2,
    0x28d3: 0x10028d3,
    0x28d4: 0x10028d4,
    0x28d5: 0x10028d5,
    0x28d6: 0x10028d6,
    0x28d7: 0x10028d7,
    0x28d8: 0x10028d8,
    0x28d9: 0x10028d9,
    0x28da: 0x10028da,
    0x28db: 0x10028db,
    0x28dc: 0x10028dc,
    0x28dd: 0x10028dd,
    0x28de: 0x10028de,
    0x28df: 0x10028df,
    0x28e0: 0x10028e0,
    0x28e1: 0x10028e1,
    0x28e2: 0x10028e2,
    0x28e3: 0x10028e3,
    0x28e4: 0x10028e4,
    0x28e5: 0x10028e5,
    0x28e6: 0x10028e6,
    0x28e7: 0x10028e7,
    0x28e8: 0x10028e8,
    0x28e9: 0x10028e9,
    0x28ea: 0x10028ea,
    0x28eb: 0x10028eb,
    0x28ec: 0x10028ec,
    0x28ed: 0x10028ed,
    0x28ee: 0x10028ee,
    0x28ef: 0x10028ef,
    0x28f0: 0x10028f0,
    0x28f1: 0x10028f1,
    0x28f2: 0x10028f2,
    0x28f3: 0x10028f3,
    0x28f4: 0x10028f4,
    0x28f5: 0x10028f5,
    0x28f6: 0x10028f6,
    0x28f7: 0x10028f7,
    0x28f8: 0x10028f8,
    0x28f9: 0x10028f9,
    0x28fa: 0x10028fa,
    0x28fb: 0x10028fb,
    0x28fc: 0x10028fc,
    0x28fd: 0x10028fd,
    0x28fe: 0x10028fe,
    0x28ff: 0x10028ff
};

var ON_KEYDOWN = 1 << 0; /* Report on keydown, otherwise wait until keypress  */


var specialKeyTable = {
    // These generate a keyDown and keyPress in Firefox and Opera
    8: [0xFF08, ON_KEYDOWN], // BACKSPACE
    13: [0xFF0D, ON_KEYDOWN], // ENTER

    // This generates a keyDown and keyPress in Opera
    9: [0xFF09, ON_KEYDOWN], // TAB

    27: 0xFF1B, // ESCAPE
    46: 0xFFFF, // DELETE
    36: 0xFF50, // HOME
    35: 0xFF57, // END
    33: 0xFF55, // PAGE_UP
    34: 0xFF56, // PAGE_DOWN
    45: 0xFF63, // INSERT
    37: 0xFF51, // LEFT
    38: 0xFF52, // UP
    39: 0xFF53, // RIGHT
    40: 0xFF54, // DOWN
    16: 0xFFE1, // SHIFT
    17: 0xFFE3, // CONTROL
    18: 0xFFE9, // Left ALT (Mac Command)
    112: 0xFFBE, // F1
    113: 0xFFBF, // F2
    114: 0xFFC0, // F3
    115: 0xFFC1, // F4
    116: 0xFFC2, // F5
    117: 0xFFC3, // F6
    118: 0xFFC4, // F7
    119: 0xFFC5, // F8
    120: 0xFFC6, // F9
    121: 0xFFC7, // F10
    122: 0xFFC8, // F11
    123: 0xFFC9  // F12
};

function getEventKeySym(ev) {
    if (typeof ev.which !== "undefined" && ev.which > 0)
        return ev.which;
    return ev.keyCode;
}

// This is based on the approach from noVNC. We handle
// everything in keydown that we have all info for, and that
// are not safe to pass on to the browser (as it may do something
// with the key. The rest we pass on to keypress so we can get the
// translated keysym.
function getKeysymSpecial(ev) {
    if (ev.keyCode in specialKeyTable) {
        var r = specialKeyTable[ev.keyCode];
        var flags = 0;
        if (typeof r != 'number') {
            flags = r[1];
            r = r[0];
        }
        if (ev.type === 'keydown' || flags & ON_KEYDOWN)
            return r;
    }
    // If we don't hold alt or ctrl, then we should be safe to pass
    // on to keypressed and look at the translated data
    if (!ev.ctrlKey && !ev.altKey)
        return null;

    var keysym = getEventKeySym(ev);

    /* 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, Opera)
        if (true /* TODO: check if browser is firefox or opera */)
            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 (!!ev.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;
    } else if (ev.keyLocation === 3) {
        // numpad keys
        switch (keysym) {
        case 96 : keysym = 48; break; // 0
        case 97 : keysym = 49; break; // 1
        case 98 : keysym = 50; break; // 2
        case 99 : keysym = 51; break; // 3
        case 100: keysym = 52; break; // 4
        case 101: keysym = 53; break; // 5
        case 102: keysym = 54; break; // 6
        case 103: keysym = 55; break; // 7
        case 104: keysym = 56; break; // 8
        case 105: keysym = 57; break; // 9
        case 109: keysym = 45; break; // -
        case 110: keysym = 46; break; // .
        case 111: keysym = 47; break; // /
        }
    }

    return keysym;
}

/* Translate DOM keyPress event to keysym value */
function getKeysym(ev) {
    var keysym, msg;

    keysym = getEventKeySym(ev);

    if ((keysym > 255) && (keysym < 0xFF00)) {
        // Map Unicode outside Latin 1 to gdk keysyms
        keysym = unicodeTable[keysym];
        if (typeof keysym === 'undefined')
            keysym = 0;
    }

    return keysym;
}

function copyKeyEvent(ev) {
    var members = ['type', 'keyCode', 'charCode', 'which',
                   'altKey', 'ctrlKey', 'shiftKey',
                   'keyLocation', 'keyIdentifier'], i, obj = {};
    for (i = 0; i < members.length; i++) {
        if (typeof ev[members[i]] !== "undefined")
            obj[members[i]] = ev[members[i]];
    }
    return obj;
}

function pushKeyEvent(fev) {
    keyDownList.push(fev);
}

function getKeyEvent(keyCode, pop) {
    var i, fev = null;
    for (i = keyDownList.length-1; i >= 0; i--) {
        if (keyDownList[i].keyCode === keyCode) {
            if ((typeof pop !== "undefined") && pop)
                fev = keyDownList.splice(i, 1)[0];
            else
                fev = keyDownList[i];
            break;
        }
    }
    return fev;
}

function ignoreKeyEvent(ev) {
    // Blarg. Some keys have a different keyCode on keyDown vs keyUp
    if (ev.keyCode === 229) {
        // French AZERTY keyboard dead key.
        // Lame thing is that the respective keyUp is 219 so we can't
        // properly ignore the keyUp event
        return true;
    }
    return false;
}

function handleKeyDown(e) {
    var fev = null, ev = (e ? e : window.event), keysym = null, suppress = false;

    fev = copyKeyEvent(ev);

    keysym = getKeysymSpecial(ev);
    // Save keysym decoding for use in keyUp
    fev.keysym = keysym;
    if (keysym) {
        // If it is a key or key combination that might trigger
        // browser behaviors or it has no corresponding keyPress
        // event, then send it immediately
        if (!ignoreKeyEvent(ev))
            sendInput(BROADWAY_EVENT_KEY_PRESS, [keysym, lastState]);
        suppress = true;
    }

    if (! ignoreKeyEvent(ev)) {
        // Add it to the list of depressed keys
        pushKeyEvent(fev);
    }

    if (suppress) {
        // Suppress bubbling/default actions
        return cancelEvent(ev);
    }

    // Allow the event to bubble and become a keyPress event which
    // will have the character code translated
    return true;
}

function handleKeyPress(e) {
    var ev = (e ? e : window.event), kdlen = keyDownList.length, keysym = null;

    if (((ev.which !== "undefined") && (ev.which === 0)) ||
        getKeysymSpecial(ev)) {
        // Firefox and Opera generate a keyPress event even if keyDown
        // is suppressed. But the keys we want to suppress will have
        // either:
        // - the which attribute set to 0
        // - getKeysymSpecial() will identify it
        return cancelEvent(ev);
    }

    keysym = getKeysym(ev);

    // Modify the which attribute in the depressed keys list so
    // that the keyUp event will be able to have the character code
    // translation available.
    if (kdlen > 0) {
        keyDownList[kdlen-1].keysym = keysym;
    } else {
        //log("keyDownList empty when keyPress triggered");
    }

    // Send the translated keysym
    if (keysym > 0)
        sendInput (BROADWAY_EVENT_KEY_PRESS, [keysym, lastState]);

    // Stop keypress events just in case
    return cancelEvent(ev);
}

function handleKeyUp(e) {
    var fev = null, ev = (e ? e : window.event), i, keysym;

    fev = getKeyEvent(ev.keyCode, true);

    if (fev)
        keysym = fev.keysym;
    else {
        //log("Key event (keyCode = " + ev.keyCode + ") not found on keyDownList");
        keysym = 0;
    }

    if (keysym > 0)
        sendInput (BROADWAY_EVENT_KEY_RELEASE, [keysym, lastState]);
    return cancelEvent(ev);
}

function onKeyDown (ev) {
    updateForEvent(ev);
    return handleKeyDown(ev);
}

function onKeyPress(ev) {
    updateForEvent(ev);
    return handleKeyPress(ev);
}

function onKeyUp (ev) {
    updateForEvent(ev);
    return handleKeyUp(ev);
}

function cancelEvent(ev)
{
    ev = ev ? ev : window.event;
    if (ev.stopPropagation)
        ev.stopPropagation();
    if (ev.preventDefault)
        ev.preventDefault();
    ev.cancelBubble = true;
    ev.cancel = true;
    ev.returnValue = false;
    return false;
}

function onMouseWheel(ev)
{
    updateForEvent(ev);
    ev = ev ? ev : window.event;

    var id = getSurfaceId(ev);
    var pos = getPositionsFromEvent(ev, id);

    var offset = ev.detail ? ev.detail : -ev.wheelDelta;
    var dir = 0;
    if (offset > 0)
        dir = 1;
    sendInput (BROADWAY_EVENT_SCROLL, [realSurfaceWithMouse, id, pos.rootX, pos.rootY, pos.winX, pos.winY, lastState, dir]);

    return cancelEvent(ev);
}

function onTouchStart(ev) {
    event.preventDefault();

    updateKeyboardStatus();
    updateForEvent(ev);

    for (var i = 0; i < ev.changedTouches.length; i++) {
        var touch = ev.changedTouches.item(i);

        var origId = getSurfaceId(touch);
        var id = getEffectiveEventTarget (origId);
        var pos = getPositionsFromEvent(touch, id);
        var isEmulated = 0;

        if (firstTouchDownId == null) {
            firstTouchDownId = touch.identifier;
            isEmulated = 1;

            if (realSurfaceWithMouse != origId || id != surfaceWithMouse) {
                if (id != 0) {
                    sendInput (BROADWAY_EVENT_LEAVE, [realSurfaceWithMouse, id, pos.rootX, pos.rootY, pos.winX, pos.winY, lastState, GDK_CROSSING_NORMAL]);
                }

                surfaceWithMouse = id;
                realSurfaceWithMouse = origId;

                sendInput (BROADWAY_EVENT_ENTER, [origId, id, pos.rootX, pos.rootY, pos.winX, pos.winY, lastState, GDK_CROSSING_NORMAL]);
            }
        }

        sendInput (BROADWAY_EVENT_TOUCH, [0, id, touch.identifier, isEmulated, pos.rootX, pos.rootY, pos.winX, pos.winY, lastState]);
    }
}

function onTouchMove(ev) {
    event.preventDefault();

    updateKeyboardStatus();
    updateForEvent(ev);

    for (var i = 0; i < ev.changedTouches.length; i++) {
        var touch = ev.changedTouches.item(i);

        var origId = getSurfaceId(touch);
        var id = getEffectiveEventTarget (origId);
        var pos = getPositionsFromEvent(touch, id);

        var isEmulated = 0;
        if (firstTouchDownId == touch.identifier) {
            isEmulated = 1;
        }

        sendInput (BROADWAY_EVENT_TOUCH, [1, id, touch.identifier, isEmulated, pos.rootX, pos.rootY, pos.winX, pos.winY, lastState]);
    }
}

function onTouchEnd(ev) {
    event.preventDefault();

    updateKeyboardStatus();
    updateForEvent(ev);

    for (var i = 0; i < ev.changedTouches.length; i++) {
        var touch = ev.changedTouches.item(i);

        var origId = getSurfaceId(touch);
        var id = getEffectiveEventTarget (origId);
        var pos = getPositionsFromEvent(touch, id);

        var isEmulated = 0;
        if (firstTouchDownId == touch.identifier) {
            isEmulated = 1;
            firstTouchDownId = null;
        }

        sendInput (BROADWAY_EVENT_TOUCH, [2, id, touch.identifier, isEmulated, pos.rootX, pos.rootY, pos.winX, pos.winY, lastState]);
    }
}

function setupDocument(document)
{
    document.oncontextmenu = function () { return false; };
    document.onmousemove = onMouseMove;
    document.onmouseover = onMouseOver;
    document.onmouseout = onMouseOut;
    document.onmousedown = onMouseDown;
    document.onmouseup = onMouseUp;
    document.onkeydown = onKeyDown;
    document.onkeypress = onKeyPress;
    document.onkeyup = onKeyUp;

    if (document.addEventListener) {
      document.addEventListener('DOMMouseScroll', onMouseWheel, false);
      document.addEventListener('mousewheel', onMouseWheel, false);
      document.addEventListener('touchstart', onTouchStart, false);
      document.addEventListener('touchmove', onTouchMove, false);
      document.addEventListener('touchend', onTouchEnd, false);
    } else if (document.attachEvent) {
      element.attachEvent("onmousewheel", onMouseWheel);
    }
}

function sendScreenSizeChanged() {
    var w, h, s;
    w = window.innerWidth;
    h = window.innerHeight;
    s = Math.round(window.devicePixelRatio);
    sendInput (BROADWAY_EVENT_SCREEN_SIZE_CHANGED, [w, h, s]);
}

function start()
{
    setupDocument(document);

    window.onresize = function(ev) {
        sendScreenSizeChanged();
    };
    window.matchMedia('screen and (min-resolution: 2dppx)').
        addListener(function(e) {
                        if (e.matches) {
                            /* devicePixelRatio >= 2 */
                            sendScreenSizeChanged();
                        } else {
                            /* devicePixelRatio < 2 */
                            sendScreenSizeChanged();
                        }
                    });
    sendScreenSizeChanged();
}

function connect()
{
    var url = window.location.toString();
    var query_string = url.split("?");
    if (query_string.length > 1) {
        var params = query_string[1].split("&");

        for (var i=0; i<params.length; i++) {
            var pair = params[i].split("=");
            if (pair[0] == "debug" && pair[1] == "decoding")
                debugDecoding = true;
        }
    }

    var loc = window.location.toString().replace("http:", "ws:").replace("https:", "wss:");
    loc = loc.substr(0, loc.lastIndexOf('/')) + "/socket";
    ws = new WebSocket(loc, "broadway");
    ws.binaryType = "arraybuffer";

    ws.onopen = function() {
        inputSocket = ws;
    };
    ws.onclose = function() {
        if (inputSocket != null)
            alert ("disconnected");
        inputSocket = null;
    };
    ws.onmessage = function(event) {
        handleMessage(event.data);
    };

    var iOS = /(iPad|iPhone|iPod)/g.test( navigator.userAgent );
    if (iOS) {
        fakeInput = document.createElement("input");
        fakeInput.type = "text";
        fakeInput.style.position = "absolute";
        fakeInput.style.left = "-1000px";
        fakeInput.style.top = "-1000px";
        document.body.appendChild(fakeInput);
    }
}