1 files changed, 59 insertions, 0 deletions
diff --git a/devtools/server/actors/accessibility/constants.js b/devtools/server/actors/accessibility/constants.js
new file mode 100644
index 0000000000..6035b5c844
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+++ b/devtools/server/actors/accessibility/constants.js
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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,
+};