/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.server.display;
import android.opengl.Matrix;
import android.os.IBinder;
import android.os.Parcel;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.util.Slog;
import android.util.SparseArray;
import com.android.internal.annotations.GuardedBy;
import java.util.Arrays;
/**
* Manager for applying color transformations to the display.
*/
public class DisplayTransformManager {
private static final String TAG = "DisplayTransformManager";
/**
* Color transform level used by Night display to tint the display red.
*/
public static final int LEVEL_COLOR_MATRIX_NIGHT_DISPLAY = 100;
/**
* Color transform level used by A11y services to make the display monochromatic.
*/
public static final int LEVEL_COLOR_MATRIX_GRAYSCALE = 200;
/**
* Color transform level used by A11y services to invert the display colors.
*/
public static final int LEVEL_COLOR_MATRIX_INVERT_COLOR = 300;
/**
* Map of level -> color transformation matrix.
*/
@GuardedBy("mColorMatrix")
private final SparseArray<float[]> mColorMatrix = new SparseArray<>(3);
/**
* Temporary matrix used internally by {@link #computeColorMatrixLocked()}.
*/
@GuardedBy("mColorMatrix")
private final float[][] mTempColorMatrix = new float[2][16];
/**
* Lock used for synchronize access to {@link #mDaltonizerMode}.
*/
private final Object mDaltonizerModeLock = new Object();
@GuardedBy("mDaltonizerModeLock")
private int mDaltonizerMode = -1;
/* package */ DisplayTransformManager() {
}
/**
* Returns a copy of the color transform matrix set for a given level.
*/
public float[] getColorMatrix(int key) {
synchronized (mColorMatrix) {
final float[] value = mColorMatrix.get(key);
return value == null ? null : Arrays.copyOf(value, value.length);
}
}
/**
* Sets and applies a current color transform matrix for a given level.
* <p>
* Note: all color transforms are first composed to a single matrix in ascending order based
* on level before being applied to the display.
*
* @param level the level used to identify and compose the color transform (low -> high)
* @param value the 4x4 color transform matrix (in column-major order), or {@code null} to
* remove the color transform matrix associated with the provided level
*/
public void setColorMatrix(int level, float[] value) {
if (value != null && value.length != 16) {
throw new IllegalArgumentException("Expected length: 16 (4x4 matrix)"
+ ", actual length: " + value.length);
}
synchronized (mColorMatrix) {
final float[] oldValue = mColorMatrix.get(level);
if (!Arrays.equals(oldValue, value)) {
if (value == null) {
mColorMatrix.remove(level);
} else if (oldValue == null) {
mColorMatrix.put(level, Arrays.copyOf(value, value.length));
} else {
System.arraycopy(value, 0, oldValue, 0, value.length);
}
// Update the current color transform.
applyColorMatrix(computeColorMatrixLocked());
}
}
}
/**
* Returns the composition of all current color matrices, or {@code null} if there are none.
*/
@GuardedBy("mColorMatrix")
private float[] computeColorMatrixLocked() {
final int count = mColorMatrix.size();
if (count == 0) {
return null;
}
final float[][] result = mTempColorMatrix;
Matrix.setIdentityM(result[0], 0);
for (int i = 0; i < count; i++) {
float[] rhs = mColorMatrix.valueAt(i);
Matrix.multiplyMM(result[(i + 1) % 2], 0, result[i % 2], 0, rhs, 0);
}
return result[count % 2];
}
/**
* Returns the current Daltonization mode.
*/
public int getDaltonizerMode() {
synchronized (mDaltonizerModeLock) {
return mDaltonizerMode;
}
}
/**
* Sets the current Daltonization mode. This adjusts the color space to correct for or simulate
* various types of color blindness.
*
* @param mode the new Daltonization mode, or -1 to disable
*/
public void setDaltonizerMode(int mode) {
synchronized (mDaltonizerModeLock) {
if (mDaltonizerMode != mode) {
mDaltonizerMode = mode;
applyDaltonizerMode(mode);
}
}
}
/**
* Propagates the provided color transformation matrix to the SurfaceFlinger.
*/
private static void applyColorMatrix(float[] m) {
final IBinder flinger = ServiceManager.getService("SurfaceFlinger");
if (flinger != null) {
final Parcel data = Parcel.obtain();
data.writeInterfaceToken("android.ui.ISurfaceComposer");
if (m != null) {
data.writeInt(1);
for (int i = 0; i < 16; i++) {
data.writeFloat(m[i]);
}
} else {
data.writeInt(0);
}
try {
flinger.transact(1015, data, null, 0);
} catch (RemoteException ex) {
Slog.e(TAG, "Failed to set color transform", ex);
} finally {
data.recycle();
}
}
}
/**
* Propagates the provided Daltonization mode to the SurfaceFlinger.
*/
private static void applyDaltonizerMode(int mode) {
final IBinder flinger = ServiceManager.getService("SurfaceFlinger");
if (flinger != null) {
final Parcel data = Parcel.obtain();
data.writeInterfaceToken("android.ui.ISurfaceComposer");
data.writeInt(mode);
try {
flinger.transact(1014, data, null, 0);
} catch (RemoteException ex) {
Slog.e(TAG, "Failed to set Daltonizer mode", ex);
} finally {
data.recycle();
}
}
}
}