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      1 /*
      2  * Copyright (C) 2011 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 import android.graphics.PixelFormat;
     20 import android.util.Slog;
     21 import android.view.Surface;
     22 import android.view.SurfaceSession;
     23 
     24 import java.io.PrintWriter;
     25 
     26 class DimSurface {
     27     static final String TAG = "DimSurface";
     28 
     29     Surface mDimSurface;
     30     boolean mDimShown = false;
     31     int mDimColor = 0;
     32     int mLayer = -1;
     33     int mLastDimWidth, mLastDimHeight;
     34 
     35     DimSurface(SurfaceSession session, final int layerStack) {
     36         try {
     37             if (WindowManagerService.DEBUG_SURFACE_TRACE) {
     38                 mDimSurface = new WindowStateAnimator.SurfaceTrace(session,
     39                     "DimSurface",
     40                     16, 16, PixelFormat.OPAQUE,
     41                     Surface.FX_SURFACE_DIM | Surface.HIDDEN);
     42             } else {
     43                 mDimSurface = new Surface(session, "DimSurface",
     44                     16, 16, PixelFormat.OPAQUE,
     45                     Surface.FX_SURFACE_DIM | Surface.HIDDEN);
     46             }
     47             if (WindowManagerService.SHOW_TRANSACTIONS ||
     48                     WindowManagerService.SHOW_SURFACE_ALLOC) Slog.i(WindowManagerService.TAG,
     49                             "  DIM " + mDimSurface + ": CREATE");
     50             mDimSurface.setLayerStack(layerStack);
     51             mDimSurface.setAlpha(0.0f);
     52             mDimSurface.show();
     53         } catch (Exception e) {
     54             Slog.e(WindowManagerService.TAG, "Exception creating Dim surface", e);
     55         }
     56     }
     57 
     58     /**
     59      * Show the dim surface.
     60      */
     61     void show(int dw, int dh, int layer, int color) {
     62         if (mDimSurface == null) {
     63             Slog.e(TAG, "show: no Surface");
     64             return;
     65         }
     66 
     67         if (!mDimShown) {
     68             if (WindowManagerService.SHOW_TRANSACTIONS) Slog.i(WindowManagerService.TAG, "  DIM " + mDimSurface + ": SHOW pos=(0,0) (" +
     69                     dw + "x" + dh + " layer=" + layer + ")");
     70             mDimShown = true;
     71             try {
     72                 mLastDimWidth = dw;
     73                 mLastDimHeight = dh;
     74                 mDimSurface.setPosition(0, 0);
     75                 mDimSurface.setSize(dw, dh);
     76                 mDimSurface.setLayer(layer);
     77                 mDimSurface.show();
     78             } catch (RuntimeException e) {
     79                 Slog.w(WindowManagerService.TAG, "Failure showing dim surface", e);
     80             }
     81         } else if (mLastDimWidth != dw || mLastDimHeight != dh || mDimColor != color
     82                 || mLayer != layer) {
     83             if (WindowManagerService.SHOW_TRANSACTIONS) Slog.i(WindowManagerService.TAG, "  DIM " + mDimSurface + ": pos=(0,0) (" +
     84                     dw + "x" + dh + " layer=" + layer + ")");
     85             mLastDimWidth = dw;
     86             mLastDimHeight = dh;
     87             mLayer = layer;
     88             mDimColor = color;
     89             mDimSurface.setSize(dw, dh);
     90             mDimSurface.setLayer(layer);
     91             mDimSurface.setAlpha(((color>>24)&0xff)/255.0f);
     92         }
     93     }
     94 
     95     void hide() {
     96         if (mDimSurface == null) {
     97             Slog.e(TAG, "hide: no Surface");
     98             return;
     99         }
    100 
    101         if (mDimShown) {
    102             mDimShown = false;
    103             try {
    104                 if (WindowManagerService.SHOW_TRANSACTIONS) Slog.i(WindowManagerService.TAG, "  HIDE " + mDimSurface);
    105                 mDimSurface.hide();
    106             } catch (RuntimeException e) {
    107                 Slog.w(WindowManagerService.TAG, "Illegal argument exception hiding dim surface");
    108             }
    109         }
    110     }
    111 
    112     void kill() {
    113         if (mDimSurface != null) {
    114             mDimSurface.destroy();
    115             mDimSurface = null;
    116         }
    117     }
    118 
    119     public void printTo(String prefix, PrintWriter pw) {
    120         pw.print(prefix); pw.print("mDimSurface="); pw.println(mDimSurface);
    121         pw.print(prefix); pw.print("mDimShown="); pw.print(mDimShown);
    122                 pw.print(" mLayer="); pw.print(mLayer);
    123                 pw.print(" mDimColor=0x"); pw.println(Integer.toHexString(mDimColor));
    124         pw.print(prefix); pw.print("mLastDimWidth="); pw.print(mLastDimWidth);
    125                 pw.print(" mLastDimWidth="); pw.println(mLastDimWidth);
    126     }
    127 }
    128