/*
* Copyright (C) 2014 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.wm;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.os.SystemClock;
import android.util.Slog;
import android.view.DisplayInfo;
import android.view.SurfaceControl;
import java.io.PrintWriter;
public class DimLayer {
private static final String TAG = "DimLayer";
private static final boolean DEBUG = false;
/** Reference to the owner of this object. */
final DisplayContent mDisplayContent;
/** Actual surface that dims */
SurfaceControl mDimSurface;
/** Last value passed to mDimSurface.setAlpha() */
float mAlpha = 0;
/** Last value passed to mDimSurface.setLayer() */
int mLayer = -1;
/** Next values to pass to mDimSurface.setPosition() and mDimSurface.setSize() */
Rect mBounds = new Rect();
/** Last values passed to mDimSurface.setPosition() and mDimSurface.setSize() */
Rect mLastBounds = new Rect();
/** True after mDimSurface.show() has been called, false after mDimSurface.hide(). */
private boolean mShowing = false;
/** Value of mAlpha when beginning transition to mTargetAlpha */
float mStartAlpha = 0;
/** Final value of mAlpha following transition */
float mTargetAlpha = 0;
/** Time in units of SystemClock.uptimeMillis() at which the current transition started */
long mStartTime;
/** Time in milliseconds to take to transition from mStartAlpha to mTargetAlpha */
long mDuration;
/** Owning stack */
final TaskStack mStack;
DimLayer(WindowManagerService service, TaskStack stack, DisplayContent displayContent) {
mStack = stack;
mDisplayContent = displayContent;
final int displayId = mDisplayContent.getDisplayId();
if (DEBUG) Slog.v(TAG, "Ctor: displayId=" + displayId);
SurfaceControl.openTransaction();
try {
if (WindowManagerService.DEBUG_SURFACE_TRACE) {
mDimSurface = new WindowStateAnimator.SurfaceTrace(service.mFxSession,
"DimSurface",
16, 16, PixelFormat.OPAQUE,
SurfaceControl.FX_SURFACE_DIM | SurfaceControl.HIDDEN);
} else {
mDimSurface = new SurfaceControl(service.mFxSession, TAG,
16, 16, PixelFormat.OPAQUE,
SurfaceControl.FX_SURFACE_DIM | SurfaceControl.HIDDEN);
}
if (WindowManagerService.SHOW_TRANSACTIONS ||
WindowManagerService.SHOW_SURFACE_ALLOC) Slog.i(TAG,
" DIM " + mDimSurface + ": CREATE");
mDimSurface.setLayerStack(displayId);
} catch (Exception e) {
Slog.e(WindowManagerService.TAG, "Exception creating Dim surface", e);
} finally {
SurfaceControl.closeTransaction();
}
}
/** Return true if dim layer is showing */
boolean isDimming() {
return mTargetAlpha != 0;
}
/** Return true if in a transition period */
boolean isAnimating() {
return mTargetAlpha != mAlpha;
}
float getTargetAlpha() {
return mTargetAlpha;
}
void setLayer(int layer) {
if (mLayer != layer) {
mLayer = layer;
mDimSurface.setLayer(layer);
}
}
int getLayer() {
return mLayer;
}
private void setAlpha(float alpha) {
if (mAlpha != alpha) {
if (DEBUG) Slog.v(TAG, "setAlpha alpha=" + alpha);
try {
mDimSurface.setAlpha(alpha);
if (alpha == 0 && mShowing) {
if (DEBUG) Slog.v(TAG, "setAlpha hiding");
mDimSurface.hide();
mShowing = false;
} else if (alpha > 0 && !mShowing) {
if (DEBUG) Slog.v(TAG, "setAlpha showing");
mDimSurface.show();
mShowing = true;
}
} catch (RuntimeException e) {
Slog.w(TAG, "Failure setting alpha immediately", e);
}
mAlpha = alpha;
}
}
/**
* NOTE: Must be called with Surface transaction open.
*/
private void adjustBounds() {
final int dw, dh;
final float xPos, yPos;
if (!mStack.isFullscreen()) {
dw = mBounds.width();
dh = mBounds.height();
xPos = mBounds.left;
yPos = mBounds.top;
} else {
// Set surface size to screen size.
final DisplayInfo info = mDisplayContent.getDisplayInfo();
// Multiply by 1.5 so that rotating a frozen surface that includes this does not expose
// a corner.
dw = (int) (info.logicalWidth * 1.5);
dh = (int) (info.logicalHeight * 1.5);
// back off position so 1/4 of Surface is before and 1/4 is after.
xPos = -1 * dw / 6;
yPos = -1 * dh / 6;
}
mDimSurface.setPosition(xPos, yPos);
mDimSurface.setSize(dw, dh);
mLastBounds.set(mBounds);
}
/** @param bounds The new bounds to set */
void setBounds(Rect bounds) {
mBounds.set(bounds);
if (isDimming() && !mLastBounds.equals(bounds)) {
try {
SurfaceControl.openTransaction();
adjustBounds();
} catch (RuntimeException e) {
Slog.w(TAG, "Failure setting size", e);
} finally {
SurfaceControl.closeTransaction();
}
}
}
/**
* @param duration The time to test.
* @return True if the duration would lead to an earlier end to the current animation.
*/
private boolean durationEndsEarlier(long duration) {
return SystemClock.uptimeMillis() + duration < mStartTime + mDuration;
}
/** Jump to the end of the animation.
* NOTE: Must be called with Surface transaction open. */
void show() {
if (isAnimating()) {
if (DEBUG) Slog.v(TAG, "show: immediate");
show(mLayer, mTargetAlpha, 0);
}
}
/**
* Begin an animation to a new dim value.
* NOTE: Must be called with Surface transaction open.
*
* @param layer The layer to set the surface to.
* @param alpha The dim value to end at.
* @param duration How long to take to get there in milliseconds.
*/
void show(int layer, float alpha, long duration) {
if (DEBUG) Slog.v(TAG, "show: layer=" + layer + " alpha=" + alpha
+ " duration=" + duration);
if (mDimSurface == null) {
Slog.e(TAG, "show: no Surface");
// Make sure isAnimating() returns false.
mTargetAlpha = mAlpha = 0;
return;
}
if (!mLastBounds.equals(mBounds)) {
adjustBounds();
}
setLayer(layer);
long curTime = SystemClock.uptimeMillis();
final boolean animating = isAnimating();
if ((animating && (mTargetAlpha != alpha || durationEndsEarlier(duration)))
|| (!animating && mAlpha != alpha)) {
if (duration <= 0) {
// No animation required, just set values.
setAlpha(alpha);
} else {
// Start or continue animation with new parameters.
mStartAlpha = mAlpha;
mStartTime = curTime;
mDuration = duration;
}
}
if (DEBUG) Slog.v(TAG, "show: mStartAlpha=" + mStartAlpha + " mStartTime=" + mStartTime);
mTargetAlpha = alpha;
}
/** Immediate hide.
* NOTE: Must be called with Surface transaction open. */
void hide() {
if (mShowing) {
if (DEBUG) Slog.v(TAG, "hide: immediate");
hide(0);
}
}
/**
* Gradually fade to transparent.
* NOTE: Must be called with Surface transaction open.
*
* @param duration Time to fade in milliseconds.
*/
void hide(long duration) {
if (mShowing && (mTargetAlpha != 0 || durationEndsEarlier(duration))) {
if (DEBUG) Slog.v(TAG, "hide: duration=" + duration);
show(mLayer, 0, duration);
}
}
/**
* Advance the dimming per the last #show(int, float, long) call.
* NOTE: Must be called with Surface transaction open.
*
* @return True if animation is still required after this step.
*/
boolean stepAnimation() {
if (mDimSurface == null) {
Slog.e(TAG, "stepAnimation: null Surface");
// Ensure that isAnimating() returns false;
mTargetAlpha = mAlpha = 0;
return false;
}
if (isAnimating()) {
final long curTime = SystemClock.uptimeMillis();
final float alphaDelta = mTargetAlpha - mStartAlpha;
float alpha = mStartAlpha + alphaDelta * (curTime - mStartTime) / mDuration;
if (alphaDelta > 0 && alpha > mTargetAlpha ||
alphaDelta < 0 && alpha < mTargetAlpha) {
// Don't exceed limits.
alpha = mTargetAlpha;
}
if (DEBUG) Slog.v(TAG, "stepAnimation: curTime=" + curTime + " alpha=" + alpha);
setAlpha(alpha);
}
return isAnimating();
}
/** Cleanup */
void destroySurface() {
if (DEBUG) Slog.v(TAG, "destroySurface.");
if (mDimSurface != null) {
mDimSurface.destroy();
mDimSurface = null;
}
}
public void printTo(String prefix, PrintWriter pw) {
pw.print(prefix); pw.print("mDimSurface="); pw.print(mDimSurface);
pw.print(" mLayer="); pw.print(mLayer);
pw.print(" mAlpha="); pw.println(mAlpha);
pw.print(prefix); pw.print("mLastBounds="); pw.print(mLastBounds.toShortString());
pw.print(" mBounds="); pw.println(mBounds.toShortString());
pw.print(prefix); pw.print("Last animation: ");
pw.print(" mDuration="); pw.print(mDuration);
pw.print(" mStartTime="); pw.print(mStartTime);
pw.print(" curTime="); pw.println(SystemClock.uptimeMillis());
pw.print(prefix); pw.print(" mStartAlpha="); pw.print(mStartAlpha);
pw.print(" mTargetAlpha="); pw.println(mTargetAlpha);
}
}