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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     Surface mDimSurface;
     28     boolean mDimShown = false;
     29     int mDimColor = 0;
     30     int mLayer = -1;
     31     int mLastDimWidth, mLastDimHeight;
     32 
     33     DimSurface(SurfaceSession session) {
     34         if (mDimSurface == null) {
     35             if (WindowManagerService.SHOW_TRANSACTIONS ||
     36                     WindowManagerService.SHOW_SURFACE_ALLOC) Slog.i(WindowManagerService.TAG,
     37                             "  DIM " + mDimSurface + ": CREATE");
     38             try {
     39                 mDimSurface = new Surface(session, 0,
     40                         "DimSurface",
     41                         -1, 16, 16, PixelFormat.OPAQUE,
     42                         Surface.FX_SURFACE_DIM);
     43                 mDimSurface.setAlpha(0.0f);
     44             } catch (Exception e) {
     45                 Slog.e(WindowManagerService.TAG, "Exception creating Dim surface", e);
     46             }
     47         }
     48     }
     49 
     50     /**
     51      * Show the dim surface.
     52      */
     53     void show(int dw, int dh, int layer, int color) {
     54         if (!mDimShown) {
     55             if (WindowManagerService.SHOW_TRANSACTIONS) Slog.i(WindowManagerService.TAG, "  DIM " + mDimSurface + ": SHOW pos=(0,0) (" +
     56                     dw + "x" + dh + " layer=" + layer + ")");
     57             mDimShown = true;
     58             try {
     59                 mLastDimWidth = dw;
     60                 mLastDimHeight = dh;
     61                 mDimSurface.setPosition(0, 0);
     62                 mDimSurface.setSize(dw, dh);
     63                 mDimSurface.setLayer(layer);
     64                 mDimSurface.show();
     65             } catch (RuntimeException e) {
     66                 Slog.w(WindowManagerService.TAG, "Failure showing dim surface", e);
     67             }
     68         } else if (mLastDimWidth != dw || mLastDimHeight != dh || mDimColor != color
     69                 || mLayer != layer) {
     70             if (WindowManagerService.SHOW_TRANSACTIONS) Slog.i(WindowManagerService.TAG, "  DIM " + mDimSurface + ": pos=(0,0) (" +
     71                     dw + "x" + dh + " layer=" + layer + ")");
     72             mLastDimWidth = dw;
     73             mLastDimHeight = dh;
     74             mLayer = layer;
     75             mDimColor = color;
     76             mDimSurface.setSize(dw, dh);
     77             mDimSurface.setLayer(layer);
     78             mDimSurface.setAlpha(((color>>24)&0xff)/255.0f);
     79         }
     80     }
     81 
     82     void hide() {
     83         if (mDimShown) {
     84             mDimShown = false;
     85             try {
     86                 if (WindowManagerService.SHOW_TRANSACTIONS) Slog.i(WindowManagerService.TAG, "  HIDE " + mDimSurface);
     87                 mDimSurface.hide();
     88             } catch (RuntimeException e) {
     89                 Slog.w(WindowManagerService.TAG, "Illegal argument exception hiding dim surface");
     90             }
     91         }
     92     }
     93 
     94     public void printTo(String prefix, PrintWriter pw) {
     95         pw.print(prefix); pw.print("mDimSurface="); pw.println(mDimSurface);
     96         pw.print(prefix); pw.print("mDimShown="); pw.print(mDimShown);
     97                 pw.print(" mLayer="); pw.print(mLayer);
     98                 pw.print(" mDimColor=0x"); pw.println(Integer.toHexString(mDimColor));
     99         pw.print(prefix); pw.print("mLastDimWidth="); pw.print(mLastDimWidth);
    100                 pw.print(" mLastDimWidth="); pw.println(mLastDimWidth);
    101     }
    102 }
    103