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      1 /*
      2  * Copyright (C) 2014 The Android Open Source Project
      3  *
      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
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     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.
     15  */
     16 
     17 package com.android.server.wm;
     18 
     19 
     20 import static com.android.server.wm.WindowManagerDebugConfig.TAG_WITH_CLASS_NAME;
     21 import static com.android.server.wm.WindowManagerDebugConfig.TAG_WM;
     22 
     23 import android.content.Context;
     24 import android.graphics.Canvas;
     25 import android.graphics.Color;
     26 import android.graphics.PixelFormat;
     27 import android.graphics.Point;
     28 import android.graphics.PorterDuff;
     29 import android.graphics.Rect;
     30 import android.graphics.drawable.Drawable;
     31 import android.view.Display;
     32 import android.view.Surface;
     33 import android.view.Surface.OutOfResourcesException;
     34 import android.view.SurfaceControl;
     35 import android.view.SurfaceSession;
     36 
     37 class EmulatorDisplayOverlay {
     38     private static final String TAG = TAG_WITH_CLASS_NAME ? "EmulatorDisplayOverlay" : TAG_WM;
     39 
     40     // Display dimensions
     41     private Point mScreenSize;
     42 
     43     private final SurfaceControl mSurfaceControl;
     44     private final Surface mSurface = new Surface();
     45     private int mLastDW;
     46     private int mLastDH;
     47     private boolean mDrawNeeded;
     48     private Drawable mOverlay;
     49     private int mRotation;
     50     private boolean mVisible;
     51 
     52     public EmulatorDisplayOverlay(Context context, DisplayContent dc,
     53             int zOrder) {
     54         final Display display = dc.getDisplay();
     55         mScreenSize = new Point();
     56         display.getSize(mScreenSize);
     57 
     58         SurfaceControl ctrl = null;
     59         try {
     60             ctrl = dc.makeOverlay()
     61                     .setName("EmulatorDisplayOverlay")
     62                     .setSize(mScreenSize.x, mScreenSize.y)
     63                     .setFormat(PixelFormat.TRANSLUCENT)
     64                     .build();
     65             ctrl.setLayer(zOrder);
     66             ctrl.setPosition(0, 0);
     67             ctrl.show();
     68             mSurface.copyFrom(ctrl);
     69         } catch (OutOfResourcesException e) {
     70         }
     71         mSurfaceControl = ctrl;
     72         mDrawNeeded = true;
     73         mOverlay = context.getDrawable(
     74                 com.android.internal.R.drawable.emulator_circular_window_overlay);
     75     }
     76 
     77     private void drawIfNeeded() {
     78         if (!mDrawNeeded || !mVisible) {
     79             return;
     80         }
     81         mDrawNeeded = false;
     82 
     83         Rect dirty = new Rect(0, 0, mScreenSize.x, mScreenSize.y);
     84         Canvas c = null;
     85         try {
     86             c = mSurface.lockCanvas(dirty);
     87         } catch (IllegalArgumentException e) {
     88         } catch (OutOfResourcesException e) {
     89         }
     90         if (c == null) {
     91             return;
     92         }
     93         c.drawColor(Color.TRANSPARENT, PorterDuff.Mode.SRC);
     94         mSurfaceControl.setPosition(0, 0);
     95         // Always draw the overlay with square dimensions
     96         int size = Math.max(mScreenSize.x, mScreenSize.y);
     97         mOverlay.setBounds(0, 0, size, size);
     98         mOverlay.draw(c);
     99         mSurface.unlockCanvasAndPost(c);
    100     }
    101 
    102     // Note: caller responsible for being inside
    103     // Surface.openTransaction() / closeTransaction()
    104     public void setVisibility(boolean on) {
    105         if (mSurfaceControl == null) {
    106             return;
    107         }
    108         mVisible = on;
    109         drawIfNeeded();
    110         if (on) {
    111             mSurfaceControl.show();
    112         } else {
    113             mSurfaceControl.hide();
    114         }
    115     }
    116 
    117     void positionSurface(int dw, int dh, int rotation) {
    118         if (mLastDW == dw && mLastDH == dh && mRotation == rotation) {
    119             return;
    120         }
    121         mLastDW = dw;
    122         mLastDH = dh;
    123         mDrawNeeded = true;
    124         mRotation = rotation;
    125         drawIfNeeded();
    126     }
    127 
    128 }
    129