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