2 * Copyright (C) 2013 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 package com.android.server.accessibility;
19 import android.content.ContentResolver;
20 import android.content.Context;
21 import android.provider.Settings.Secure;
22 import android.view.accessibility.AccessibilityManager;
24 import com.android.server.LocalServices;
25 import com.android.server.display.DisplayTransformManager;
28 * Utility methods for performing accessibility display adjustments.
30 class DisplayAdjustmentUtils {
32 /** Default inversion mode for display color correction. */
33 private static final int DEFAULT_DISPLAY_DALTONIZER =
34 AccessibilityManager.DALTONIZER_CORRECT_DEUTERANOMALY;
36 /** Matrix and offset used for converting color to gray-scale. */
37 private static final float[] MATRIX_GRAYSCALE = new float[] {
38 .2126f, .2126f, .2126f, 0,
39 .7152f, .7152f, .7152f, 0,
40 .0722f, .0722f, .0722f, 0,
45 * Matrix and offset used for luminance inversion. Represents a transform
46 * from RGB to YIQ color space, rotation around the Y axis by 180 degrees,
47 * transform back to RGB color space, and subtraction from 1. The last row
48 * represents a non-multiplied addition, see surfaceflinger's ProgramCache
49 * for full implementation details.
51 private static final float[] MATRIX_INVERT_COLOR = new float[] {
52 0.402f, -0.598f, -0.599f, 0,
53 -1.174f, -0.174f, -1.175f, 0,
54 -0.228f, -0.228f, 0.772f, 0,
58 public static void applyDaltonizerSetting(Context context, int userId) {
59 final ContentResolver cr = context.getContentResolver();
60 final DisplayTransformManager dtm = LocalServices.getService(DisplayTransformManager.class);
62 int daltonizerMode = AccessibilityManager.DALTONIZER_DISABLED;
63 if (Secure.getIntForUser(cr,
64 Secure.ACCESSIBILITY_DISPLAY_DALTONIZER_ENABLED, 0, userId) != 0) {
65 daltonizerMode = Secure.getIntForUser(cr,
66 Secure.ACCESSIBILITY_DISPLAY_DALTONIZER, DEFAULT_DISPLAY_DALTONIZER, userId);
69 float[] grayscaleMatrix = null;
70 if (daltonizerMode == AccessibilityManager.DALTONIZER_SIMULATE_MONOCHROMACY) {
71 // Monochromacy isn't supported by the native Daltonizer.
72 grayscaleMatrix = MATRIX_GRAYSCALE;
73 daltonizerMode = AccessibilityManager.DALTONIZER_DISABLED;
75 dtm.setColorMatrix(DisplayTransformManager.LEVEL_COLOR_MATRIX_GRAYSCALE, grayscaleMatrix);
76 dtm.setDaltonizerMode(daltonizerMode);
80 * Applies the specified user's display color adjustments.
82 public static void applyInversionSetting(Context context, int userId) {
83 final ContentResolver cr = context.getContentResolver();
84 final DisplayTransformManager dtm = LocalServices.getService(DisplayTransformManager.class);
86 final boolean invertColors = Secure.getIntForUser(cr,
87 Secure.ACCESSIBILITY_DISPLAY_INVERSION_ENABLED, 0, userId) != 0;
88 dtm.setColorMatrix(DisplayTransformManager.LEVEL_COLOR_MATRIX_INVERT_COLOR,
89 invertColors ? MATRIX_INVERT_COLOR : null);