/*
* Copyright (C) 2011 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.content.res.Resources;
import android.graphics.PixelFormat;
import android.util.Slog;
import android.util.TypedValue;
import android.view.Surface;
import android.view.SurfaceSession;
import java.io.PrintWriter;
/**
* DimAnimator class that controls the dim animation. This holds the surface and
* all state used for dim animation.
*/
class DimAnimator {
Surface mDimSurface;
boolean mDimShown = false;
float mDimCurrentAlpha;
float mDimTargetAlpha;
float mDimDeltaPerMs;
long mLastDimAnimTime;
int mLastDimWidth, mLastDimHeight;
DimAnimator (SurfaceSession session) {
if (mDimSurface == null) {
if (WindowManagerService.SHOW_TRANSACTIONS ||
WindowManagerService.SHOW_SURFACE_ALLOC) Slog.i(WindowManagerService.TAG,
" DIM " + mDimSurface + ": CREATE");
try {
mDimSurface = new Surface(session, 0,
"DimAnimator",
-1, 16, 16, PixelFormat.OPAQUE,
Surface.FX_SURFACE_DIM);
mDimSurface.setAlpha(0.0f);
} catch (Exception e) {
Slog.e(WindowManagerService.TAG, "Exception creating Dim surface", e);
}
}
}
/**
* Show the dim surface.
*/
void show(int dw, int dh) {
if (!mDimShown) {
if (WindowManagerService.SHOW_TRANSACTIONS) Slog.i(WindowManagerService.TAG, " DIM " + mDimSurface + ": SHOW pos=(0,0) (" +
dw + "x" + dh + ")");
mDimShown = true;
try {
mLastDimWidth = dw;
mLastDimHeight = dh;
mDimSurface.setPosition(0, 0);
mDimSurface.setSize(dw, dh);
mDimSurface.show();
} catch (RuntimeException e) {
Slog.w(WindowManagerService.TAG, "Failure showing dim surface", e);
}
} else if (mLastDimWidth != dw || mLastDimHeight != dh) {
mLastDimWidth = dw;
mLastDimHeight = dh;
mDimSurface.setSize(dw, dh);
}
}
/**
* Set's the dim surface's layer and update dim parameters that will be used in
* {@link updateSurface} after all windows are examined.
*/
void updateParameters(Resources res, WindowState w, long currentTime) {
mDimSurface.setLayer(w.mAnimLayer - WindowManagerService.LAYER_OFFSET_DIM);
final float target = w.mExiting ? 0 : w.mAttrs.dimAmount;
if (WindowManagerService.SHOW_TRANSACTIONS) Slog.i(WindowManagerService.TAG, " DIM " + mDimSurface
+ ": layer=" + (w.mAnimLayer-1) + " target=" + target);
if (mDimTargetAlpha != target) {
// If the desired dim level has changed, then
// start an animation to it.
mLastDimAnimTime = currentTime;
long duration = (w.mAnimating && w.mAnimation != null)
? w.mAnimation.computeDurationHint()
: WindowManagerService.DEFAULT_DIM_DURATION;
if (target > mDimTargetAlpha) {
TypedValue tv = new TypedValue();
res.getValue(com.android.internal.R.fraction.config_dimBehindFadeDuration,
tv, true);
if (tv.type == TypedValue.TYPE_FRACTION) {
duration = (long)tv.getFraction((float)duration, (float)duration);
} else if (tv.type >= TypedValue.TYPE_FIRST_INT
&& tv.type <= TypedValue.TYPE_LAST_INT) {
duration = tv.data;
}
}
if (duration < 1) {
// Don't divide by zero
duration = 1;
}
mDimTargetAlpha = target;
mDimDeltaPerMs = (mDimTargetAlpha-mDimCurrentAlpha) / duration;
}
}
/**
* Updating the surface's alpha. Returns true if the animation continues, or returns
* false when the animation is finished and the dim surface is hidden.
*/
boolean updateSurface(boolean dimming, long currentTime, boolean displayFrozen) {
if (!dimming) {
if (mDimTargetAlpha != 0) {
mLastDimAnimTime = currentTime;
mDimTargetAlpha = 0;
mDimDeltaPerMs = (-mDimCurrentAlpha) / WindowManagerService.DEFAULT_DIM_DURATION;
}
}
boolean animating = false;
if (mLastDimAnimTime != 0) {
mDimCurrentAlpha += mDimDeltaPerMs
* (currentTime-mLastDimAnimTime);
boolean more = true;
if (displayFrozen) {
// If the display is frozen, there is no reason to animate.
more = false;
} else if (mDimDeltaPerMs > 0) {
if (mDimCurrentAlpha > mDimTargetAlpha) {
more = false;
}
} else if (mDimDeltaPerMs < 0) {
if (mDimCurrentAlpha < mDimTargetAlpha) {
more = false;
}
} else {
more = false;
}
// Do we need to continue animating?
if (more) {
if (WindowManagerService.SHOW_TRANSACTIONS) Slog.i(WindowManagerService.TAG, " DIM "
+ mDimSurface + ": alpha=" + mDimCurrentAlpha);
mLastDimAnimTime = currentTime;
mDimSurface.setAlpha(mDimCurrentAlpha);
animating = true;
} else {
mDimCurrentAlpha = mDimTargetAlpha;
mLastDimAnimTime = 0;
if (WindowManagerService.SHOW_TRANSACTIONS) Slog.i(WindowManagerService.TAG, " DIM "
+ mDimSurface + ": final alpha=" + mDimCurrentAlpha);
mDimSurface.setAlpha(mDimCurrentAlpha);
if (!dimming) {
if (WindowManagerService.SHOW_TRANSACTIONS) Slog.i(WindowManagerService.TAG, " DIM " + mDimSurface
+ ": HIDE");
try {
mDimSurface.hide();
} catch (RuntimeException e) {
Slog.w(WindowManagerService.TAG, "Illegal argument exception hiding dim surface");
}
mDimShown = false;
}
}
}
return animating;
}
public void printTo(String prefix, PrintWriter pw) {
pw.print(prefix);
pw.print("mDimSurface="); pw.print(mDimSurface);
pw.print(" "); pw.print(mLastDimWidth); pw.print(" x ");
pw.println(mLastDimHeight);
pw.print(prefix);
pw.print("mDimShown="); pw.print(mDimShown);
pw.print(" current="); pw.print(mDimCurrentAlpha);
pw.print(" target="); pw.print(mDimTargetAlpha);
pw.print(" delta="); pw.print(mDimDeltaPerMs);
pw.print(" lastAnimTime="); pw.println(mLastDimAnimTime);
}
}