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/** \file
* \brief Wrappers for Cooperative Scheduling of Background Tasks API
*
* \see https://w3c.github.io/requestidlecallback/#the-requestidlecallback-method
*
* \author Copyright (C) 2022 Libor Polcak
*
* \license SPDX-License-Identifier: GPL-3.0-or-later
*/
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
//
/** \file
* \ingroup wrappers
*
* The `window.requestIdleCallback()` API can schedule background tasks
* such that they do not introduce delays to other high priority tasks
* that share the same event loop, such as input processing, animations
* and frame compositing.
*
* But the API leaks information about the other tasks running in the
* browser as it leaks information on currently scheduled tasks, vsync
* deadlines, user-interaction and so on.
*
* JShelter modifies the return call to:
*
* 1. Never leak the information that the call was triggered by an
* expired timeout.
* 2. Fake the information on remaining time in synchronization with the
* `Date.now()` wrapper. Returns up to 50% more time compared to the
* original value.
*/
/*
* Create private namespace
*/
(function() {
var wrappers = [
{
parent_object: "IdleDeadline.prototype",
parent_object_property: "didTimeout",
wrapped_objects: [],
helping_code: ``,
post_wrapping_code: [
{
code_type: "object_properties",
parent_object: "IdleDeadline.prototype",
parent_object_property: "didTimeout",
wrapped_objects: [],
/** \brief replaces IdleDeadline.prototype.didTimeout getter
*/
wrapped_properties: [
{
property_name: "get",
property_value: `
function() {
return false;
}`,
},
],
}
],
},
{
parent_object: "IdleDeadline.prototype",
parent_object_property: "timeRemaining",
wrapped_objects: [
{
original_name: "IdleDeadline.prototype.timeRemaining",
wrapped_name: "originalF",
},
],
helping_code: "var lastEnd = 0;",
wrapping_function_args: "",
wrapping_function_body: `
let ret;
let now = Date.now();
if (now > lastEnd) {
let originalTimeR = originalF.call(this);
ret = prng() * originalTimeR * 1.5;
lastEnd = now + ret;
}
else {
ret = lastEnd - now;
}
return ret;
`,
},
]
add_wrappers(wrappers);
})();
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