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/*
* Copyright (C) 2010 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.Canvas;
import android.graphics.Color;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.graphics.Region;
import android.view.Display;
import android.view.Surface;
import android.view.SurfaceControl;
import android.view.SurfaceSession;
class StrictModeFlash {
private static final String TAG = "StrictModeFlash";
private final SurfaceControl mSurfaceControl;
private final Surface mSurface = new Surface();
private int mLastDW;
private int mLastDH;
private boolean mDrawNeeded;
private final int mThickness = 20;
public StrictModeFlash(Display display, SurfaceSession session) {
SurfaceControl ctrl = null;
try {
ctrl = new SurfaceControl(session, "StrictModeFlash",
1, 1, PixelFormat.TRANSLUCENT, SurfaceControl.HIDDEN);
ctrl.setLayerStack(display.getLayerStack());
ctrl.setLayer(WindowManagerService.TYPE_LAYER_MULTIPLIER * 101); // one more than Watermark? arbitrary.
ctrl.setPosition(0, 0);
ctrl.show();
mSurface.copyFrom(ctrl);
} catch (SurfaceControl.OutOfResourcesException e) {
}
mSurfaceControl = ctrl;
mDrawNeeded = true;
}
private void drawIfNeeded() {
if (!mDrawNeeded) {
return;
}
mDrawNeeded = false;
final int dw = mLastDW;
final int dh = mLastDH;
Rect dirty = new Rect(0, 0, dw, dh);
Canvas c = null;
try {
c = mSurface.lockCanvas(dirty);
} catch (IllegalArgumentException e) {
} catch (Surface.OutOfResourcesException e) {
}
if (c == null) {
return;
}
// Top
c.clipRect(new Rect(0, 0, dw, mThickness), Region.Op.REPLACE);
c.drawColor(Color.RED);
// Left
c.clipRect(new Rect(0, 0, mThickness, dh), Region.Op.REPLACE);
c.drawColor(Color.RED);
// Right
c.clipRect(new Rect(dw - mThickness, 0, dw, dh), Region.Op.REPLACE);
c.drawColor(Color.RED);
// Bottom
c.clipRect(new Rect(0, dh - mThickness, dw, dh), Region.Op.REPLACE);
c.drawColor(Color.RED);
mSurface.unlockCanvasAndPost(c);
}
// Note: caller responsible for being inside
// Surface.openTransaction() / closeTransaction()
public void setVisibility(boolean on) {
if (mSurfaceControl == null) {
return;
}
drawIfNeeded();
if (on) {
mSurfaceControl.show();
} else {
mSurfaceControl.hide();
}
}
void positionSurface(int dw, int dh) {
if (mLastDW == dw && mLastDH == dh) {
return;
}
mLastDW = dw;
mLastDH = dh;
mSurfaceControl.setSize(dw, dh);
mDrawNeeded = true;
}
}
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