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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.DEBUG_SURFACE_TRACE;
     21 import static com.android.server.wm.WindowManagerDebugConfig.TAG_WITH_CLASS_NAME;
     22 import static com.android.server.wm.WindowManagerDebugConfig.TAG_WM;
     23 
     24 import android.content.Context;
     25 import android.graphics.Canvas;
     26 import android.graphics.Color;
     27 import android.graphics.PixelFormat;
     28 import android.graphics.Point;
     29 import android.graphics.PorterDuff;
     30 import android.graphics.Rect;
     31 import android.graphics.drawable.Drawable;
     32 import android.view.Display;
     33 import android.view.Surface;
     34 import android.view.Surface.OutOfResourcesException;
     35 import android.view.SurfaceControl;
     36 import android.view.SurfaceSession;
     37 
     38 class EmulatorDisplayOverlay {
     39     private static final String TAG = TAG_WITH_CLASS_NAME ? "EmulatorDisplayOverlay" : TAG_WM;
     40 
     41     // Display dimensions
     42     private Point mScreenSize;
     43 
     44     private final SurfaceControl mSurfaceControl;
     45     private final Surface mSurface = new Surface();
     46     private int mLastDW;
     47     private int mLastDH;
     48     private boolean mDrawNeeded;
     49     private Drawable mOverlay;
     50     private int mRotation;
     51     private boolean mVisible;
     52 
     53     public EmulatorDisplayOverlay(Context context, Display display, SurfaceSession session,
     54             int zOrder) {
     55         mScreenSize = new Point();
     56         display.getSize(mScreenSize);
     57 
     58         SurfaceControl ctrl = null;
     59         try {
     60             if (DEBUG_SURFACE_TRACE) {
     61                 ctrl = new WindowSurfaceController.SurfaceTrace(session, "EmulatorDisplayOverlay",
     62                         mScreenSize.x, mScreenSize.y, PixelFormat.TRANSLUCENT,
     63                         SurfaceControl.HIDDEN);
     64             } else {
     65                 ctrl = new SurfaceControl(session, "EmulatorDisplayOverlay", mScreenSize.x,
     66                         mScreenSize.y, PixelFormat.TRANSLUCENT, SurfaceControl.HIDDEN);
     67             }
     68             ctrl.setLayerStack(display.getLayerStack());
     69             ctrl.setLayer(zOrder);
     70             ctrl.setPosition(0, 0);
     71             ctrl.show();
     72             mSurface.copyFrom(ctrl);
     73         } catch (OutOfResourcesException e) {
     74         }
     75         mSurfaceControl = ctrl;
     76         mDrawNeeded = true;
     77         mOverlay = context.getDrawable(
     78                 com.android.internal.R.drawable.emulator_circular_window_overlay);
     79     }
     80 
     81     private void drawIfNeeded() {
     82         if (!mDrawNeeded || !mVisible) {
     83             return;
     84         }
     85         mDrawNeeded = false;
     86 
     87         Rect dirty = new Rect(0, 0, mScreenSize.x, mScreenSize.y);
     88         Canvas c = null;
     89         try {
     90             c = mSurface.lockCanvas(dirty);
     91         } catch (IllegalArgumentException e) {
     92         } catch (OutOfResourcesException e) {
     93         }
     94         if (c == null) {
     95             return;
     96         }
     97         c.drawColor(Color.TRANSPARENT, PorterDuff.Mode.SRC);
     98         mSurfaceControl.setPosition(0, 0);
     99         // Always draw the overlay with square dimensions
    100         int size = Math.max(mScreenSize.x, mScreenSize.y);
    101         mOverlay.setBounds(0, 0, size, size);
    102         mOverlay.draw(c);
    103         mSurface.unlockCanvasAndPost(c);
    104     }
    105 
    106     // Note: caller responsible for being inside
    107     // Surface.openTransaction() / closeTransaction()
    108     public void setVisibility(boolean on) {
    109         if (mSurfaceControl == null) {
    110             return;
    111         }
    112         mVisible = on;
    113         drawIfNeeded();
    114         if (on) {
    115             mSurfaceControl.show();
    116         } else {
    117             mSurfaceControl.hide();
    118         }
    119     }
    120 
    121     void positionSurface(int dw, int dh, int rotation) {
    122         if (mLastDW == dw && mLastDH == dh && mRotation == rotation) {
    123             return;
    124         }
    125         mLastDW = dw;
    126         mLastDH = dh;
    127         mDrawNeeded = true;
    128         mRotation = rotation;
    129         drawIfNeeded();
    130     }
    131 
    132 }
    133