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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
const {
accessibility: {
SIMULATION_TYPE: {
ACHROMATOPSIA,
DEUTERANOPIA,
PROTANOPIA,
TRITANOPIA,
CONTRAST_LOSS,
},
},
} = require("resource://devtools/shared/constants.js");
/**
* Constants used in accessibility actors.
*/
// Color blindness matrix values taken from Machado et al. (2009), https://doi.org/10.1109/TVCG.2009.113:
// https://www.inf.ufrgs.br/~oliveira/pubs_files/CVD_Simulation/CVD_Simulation.html
// Contrast loss matrix values are for 50% contrast (see https://docs.rainmeter.net/tips/colormatrix-guide/,
// and https://stackoverflow.com/questions/23865511/contrast-with-color-matrix). The matrices are flattened
// 4x5 matrices, needed for docShell setColorMatrix method. i.e. A 4x5 matrix of the form:
// 1 2 3 4 5
// 6 7 8 9 10
// 11 12 13 14 15
// 16 17 18 19 20
// will be need to be set in docShell as:
// [1, 6, 11, 16, 2, 7, 12, 17, 3, 8, 13, 18, 4, 9, 14, 19, 5, 10, 15, 20]
const COLOR_TRANSFORMATION_MATRICES = {
NONE: [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0],
[ACHROMATOPSIA]: [
0.299,
0.299,
0.299,
0,
0.587,
0.587,
0.587,
0,
0.114,
0.114,
0.114,
0,
0,
0,
0,
1,
0,
0,
0,
0,
],
[PROTANOPIA]: [
0.152286,
0.114503,
-0.003882,
0,
1.052583,
0.786281,
-0.048116,
0,
-0.204868,
0.099216,
1.051998,
0,
0,
0,
0,
1,
0,
0,
0,
0,
],
[DEUTERANOPIA]: [
0.367322,
0.280085,
-0.01182,
0,
0.860646,
0.672501,
0.04294,
0,
-0.227968,
0.047413,
0.968881,
0,
0,
0,
0,
1,
0,
0,
0,
0,
],
[TRITANOPIA]: [
1.255528,
-0.078411,
0.004733,
0,
-0.076749,
0.930809,
0.691367,
0,
-0.178779,
0.147602,
0.3039,
0,
0,
0,
0,
1,
0,
0,
0,
0,
],
[CONTRAST_LOSS]: [
0.5,
0,
0,
0,
0,
0.5,
0,
0,
0,
0,
0.5,
0,
0,
0,
0,
0.5,
0.25,
0.25,
0.25,
0,
],
};
exports.simulation = {
COLOR_TRANSFORMATION_MATRICES,
};
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