Client.cpp revision b79f61d41ef053bee1087ec612896c59f95f9686 
1/*
2 * Copyright (C) 2012 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#include <stdint.h>
18#include <sys/types.h>
19
20#include <binder/PermissionCache.h>
21
22#include <private/android_filesystem_config.h>
23
24#include "Client.h"
25#include "Layer.h"
26#include "LayerBase.h"
27#include "SurfaceFlinger.h"
28
29namespace android {
30
31// ---------------------------------------------------------------------------
32
33const String16 sAccessSurfaceFlinger("android.permission.ACCESS_SURFACE_FLINGER");
34
35// ---------------------------------------------------------------------------
36
37Client::Client(const sp<SurfaceFlinger>& flinger)
38    : mFlinger(flinger)
39{
40}
41
42Client::~Client()
43{
44    const size_t count = mLayers.size();
45    for (size_t i=0 ; i<count ; i++) {
46        sp<LayerBase> layer(mLayers.valueAt(i).promote());
47        if (layer != 0) {
48            mFlinger->removeLayer(layer);
49        }
50    }
51}
52
53status_t Client::initCheck() const {
54    return NO_ERROR;
55}
56
57void Client::attachLayer(const sp<IBinder>& handle, const sp<LayerBase>& layer)
58{
59    Mutex::Autolock _l(mLock);
60    mLayers.add(handle, layer);
61}
62
63void Client::detachLayer(const LayerBase* layer)
64{
65    Mutex::Autolock _l(mLock);
66    // we do a linear search here, because this doesn't happen often
67    const size_t count = mLayers.size();
68    for (size_t i=0 ; i<count ; i++) {
69        if (mLayers.valueAt(i) == layer) {
70            mLayers.removeItemsAt(i, 1);
71            break;
72        }
73    }
74}
75sp<LayerBase> Client::getLayerUser(const sp<IBinder>& handle) const
76{
77    Mutex::Autolock _l(mLock);
78    sp<LayerBase> lbc;
79    wp<LayerBase> layer(mLayers.valueFor(handle));
80    if (layer != 0) {
81        lbc = layer.promote();
82        ALOGE_IF(lbc==0, "getLayerUser(name=%p) is dead", handle.get());
83    }
84    return lbc;
85}
86
87
88status_t Client::onTransact(
89    uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
90{
91    // these must be checked
92     IPCThreadState* ipc = IPCThreadState::self();
93     const int pid = ipc->getCallingPid();
94     const int uid = ipc->getCallingUid();
95     const int self_pid = getpid();
96     if (CC_UNLIKELY(pid != self_pid && uid != AID_GRAPHICS && uid != 0)) {
97         // we're called from a different process, do the real check
98         if (!PermissionCache::checkCallingPermission(sAccessSurfaceFlinger))
99         {
100             ALOGE("Permission Denial: "
101                     "can't openGlobalTransaction pid=%d, uid=%d", pid, uid);
102             return PERMISSION_DENIED;
103         }
104     }
105     return BnSurfaceComposerClient::onTransact(code, data, reply, flags);
106}
107
108
109sp<ISurface> Client::createSurface(
110        const String8& name,
111        uint32_t w, uint32_t h, PixelFormat format,
112        uint32_t flags)
113{
114    /*
115     * createSurface must be called from the GL thread so that it can
116     * have access to the GL context.
117     */
118
119    class MessageCreateLayer : public MessageBase {
120        sp<ISurface> result;
121        SurfaceFlinger* flinger;
122        Client* client;
123        const String8& name;
124        uint32_t w, h;
125        PixelFormat format;
126        uint32_t flags;
127    public:
128        MessageCreateLayer(SurfaceFlinger* flinger,
129                const String8& name, Client* client,
130                uint32_t w, uint32_t h, PixelFormat format,
131                uint32_t flags)
132            : flinger(flinger), client(client), name(name),
133              w(w), h(h), format(format), flags(flags)
134        {
135        }
136        sp<ISurface> getResult() const { return result; }
137        virtual bool handler() {
138            result = flinger->createLayer(name, client, w, h, format, flags);
139            return true;
140        }
141    };
142
143    sp<MessageBase> msg = new MessageCreateLayer(mFlinger.get(),
144            name, this, w, h, format, flags);
145    mFlinger->postMessageSync(msg);
146    return static_cast<MessageCreateLayer*>( msg.get() )->getResult();
147}
148
149status_t Client::destroySurface(const sp<IBinder>& handle) {
150    return mFlinger->onLayerRemoved(this, handle);
151}
152
153// ---------------------------------------------------------------------------
154}; // namespace android
155