Updated extensions:

 * Upgraded Privacy Redirect to 1.1.49 and configured to use the 10 most reliable invidious instances
 * Removed ViewTube
 * Added torproxy@icecat.gnu based on 'Proxy toggle' extension
 * Added jShelter 0.11.1
 * Upgraded LibreJS to 7.21.0
 * Upgraded HTTPS Everywhere to 2021.7.13
 * Upgraded SubmitMe to 1.9

1 files changed, 65 insertions, 0 deletions

diff --git a/data/extensions/jsr@javascriptrestrictor/wrappingL-CANVAS.js b/data/extensions/jsr@javascriptrestrictor/wrappingL-CANVAS.js
new file mode 100644
index 0000000..0521893
--- /dev/null
+++ b/data/extensions/jsr@javascriptrestrictor/wrappingL-CANVAS.js
@@ -0,0 +1,65 @@
+/** \file
+ * \brief Library of functions for the Canvas API wrappers
+ *
+ * \see https://www.w3.org/TR/generic-sensor/
+ *
+ *  \author Copyright (C) 2022  Libor Polčák
+ *  \author Copyright (C) 2021  Matus Svancar
+ *
+ *  \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
+  *
+  * Supporting fuctions for Canvas API Wrappers
+  */
+
+/**
+ * Farble image data, original Brave implementation-like
+ *
+ * \param data RGBA shallow array, (0,0) coordinates are at the top left,
+ * see CanvasRenderingContext2D.prototype.getImageData for more details on the
+ * expected format. Note that the data are modified during the call.
+ * \param height Height of the original canvas.
+ * \param width Width of the original canvas.
+ */
+function farbleCanvasDataBrave(rowIterator, width) {
+	// PRNG function needs to depend on the original canvas, so that the same
+	// image is farbled the same way but different images are farbled differently
+	// See https://pagure.io/JShelter/webextension/issue/23
+	let crc = new CRC16();
+	for (row of rowIterator()) {
+		crc.next(row);
+	}
+	var thiscanvas_prng = alea(domainHash, "CanvasFarbling", crc.crc);
+	var data_count = BigInt(BigInt(width) * 4n);
+
+	for (row of rowIterator()) {
+		for (let i = 0n; i < data_count; i++) {
+			if ((i % 4n) === 3n) {
+				// Do not modify alpha
+				continue;
+			}
+			if (thiscanvas_prng.get_bits(1)) { // Modify data with probability of 0.5
+				// Possible improvements:
+				// Copy a neighbor pixel (possibly with modifications
+				// Make bigger canges than xoring with 1
+				row[i] ^= 1;
+			}
+		}
+	}
+}