DimSurface.java revision 29735689cea7bf52998c1911542dcfdd1c1d9628 
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
17package com.android.server.wm;
18
19import android.graphics.PixelFormat;
20import android.util.Slog;
21import android.view.Surface;
22import android.view.SurfaceSession;
23
24import java.io.PrintWriter;
25
26class 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) Slog.i(WindowManagerService.TAG, "  DIM "
36                    + mDimSurface + ": CREATE");
37            try {
38                mDimSurface = new Surface(session, 0,
39                        "DimSurface",
40                        -1, 16, 16, PixelFormat.OPAQUE,
41                        Surface.FX_SURFACE_DIM);
42                mDimSurface.setAlpha(0.0f);
43            } catch (Exception e) {
44                Slog.e(WindowManagerService.TAG, "Exception creating Dim surface", e);
45            }
46        }
47    }
48
49    /**
50     * Show the dim surface.
51     */
52    void show(int dw, int dh, int layer, int color) {
53        if (!mDimShown) {
54            if (WindowManagerService.SHOW_TRANSACTIONS) Slog.i(WindowManagerService.TAG, "  DIM " + mDimSurface + ": SHOW pos=(0,0) (" +
55                    dw + "x" + dh + ")");
56            mDimShown = true;
57            try {
58                mLastDimWidth = dw;
59                mLastDimHeight = dh;
60                mDimSurface.setPosition(0, 0);
61                mDimSurface.setSize(dw, dh);
62                mDimSurface.show();
63            } catch (RuntimeException e) {
64                Slog.w(WindowManagerService.TAG, "Failure showing dim surface", e);
65            }
66        } else if (mLastDimWidth != dw || mLastDimHeight != dh || mDimColor != color
67                || mLayer != layer) {
68            mLastDimWidth = dw;
69            mLastDimHeight = dh;
70            mLayer = layer;
71            mDimColor = color;
72            mDimSurface.setSize(dw, dh);
73            mDimSurface.setLayer(layer);
74            mDimSurface.setAlpha(((color>>24)&0xff)/255.0f);
75        }
76    }
77
78    void hide() {
79        if (mDimShown) {
80            mDimShown = false;
81            try {
82                mDimSurface.hide();
83            } catch (RuntimeException e) {
84                Slog.w(WindowManagerService.TAG, "Illegal argument exception hiding dim surface");
85            }
86        }
87    }
88
89    public void printTo(String prefix, PrintWriter pw) {
90        pw.print(prefix); pw.print("mDimSurface="); pw.println(mDimSurface);
91        pw.print(prefix); pw.print("mDimShown="); pw.print(mDimShown);
92                pw.print(" mLayer="); pw.print(mLayer);
93                pw.print(" mDimColor=0x"); pw.println(Integer.toHexString(mDimColor));
94        pw.print(prefix); pw.print("mLastDimWidth="); pw.print(mLastDimWidth);
95                pw.print(" mLastDimWidth="); pw.println(mLastDimWidth);
96    }
97}
98