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#include <binder/IPCThreadState.h>
22
23#include <private/android_filesystem_config.h>
24
25#include "Client.h"
26#include "Layer.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        mFlinger->removeLayer(mLayers.valueAt(i));
47    }
48}
49
50status_t Client::initCheck() const {
51    return NO_ERROR;
52}
53
54void Client::attachLayer(const sp<IBinder>& handle, const sp<Layer>& layer)
55{
56    Mutex::Autolock _l(mLock);
57    mLayers.add(handle, layer);
58}
59
60void Client::detachLayer(const Layer* layer)
61{
62    Mutex::Autolock _l(mLock);
63    // we do a linear search here, because this doesn't happen often
64    const size_t count = mLayers.size();
65    for (size_t i=0 ; i<count ; i++) {
66        if (mLayers.valueAt(i) == layer) {
67            mLayers.removeItemsAt(i, 1);
68            break;
69        }
70    }
71}
72sp<Layer> Client::getLayerUser(const sp<IBinder>& handle) const
73{
74    Mutex::Autolock _l(mLock);
75    sp<Layer> lbc;
76    wp<Layer> layer(mLayers.valueFor(handle));
77    if (layer != 0) {
78        lbc = layer.promote();
79        ALOGE_IF(lbc==0, "getLayerUser(name=%p) is dead", handle.get());
80    }
81    return lbc;
82}
83
84
85status_t Client::onTransact(
86    uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
87{
88    // these must be checked
89     IPCThreadState* ipc = IPCThreadState::self();
90     const int pid = ipc->getCallingPid();
91     const int uid = ipc->getCallingUid();
92     const int self_pid = getpid();
93     if (CC_UNLIKELY(pid != self_pid && uid != AID_GRAPHICS && uid != AID_SYSTEM && uid != 0)) {
94         // we're called from a different process, do the real check
95         if (!PermissionCache::checkCallingPermission(sAccessSurfaceFlinger))
96         {
97             ALOGE("Permission Denial: "
98                     "can't openGlobalTransaction pid=%d, uid=%d", pid, uid);
99             return PERMISSION_DENIED;
100         }
101     }
102     return BnSurfaceComposerClient::onTransact(code, data, reply, flags);
103}
104
105
106status_t Client::createSurface(
107        const String8& name,
108        uint32_t w, uint32_t h, PixelFormat format, uint32_t flags,
109        sp<IBinder>* handle,
110        sp<IGraphicBufferProducer>* gbp)
111{
112    /*
113     * createSurface must be called from the GL thread so that it can
114     * have access to the GL context.
115     */
116
117    class MessageCreateLayer : public MessageBase {
118        SurfaceFlinger* flinger;
119        Client* client;
120        sp<IBinder>* handle;
121        sp<IGraphicBufferProducer>* gbp;
122        status_t result;
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, uint32_t flags,
131                sp<IBinder>* handle,
132                sp<IGraphicBufferProducer>* gbp)
133            : flinger(flinger), client(client),
134              handle(handle), gbp(gbp), result(NO_ERROR),
135              name(name), w(w), h(h), format(format), flags(flags) {
136        }
137        status_t getResult() const { return result; }
138        virtual bool handler() {
139            result = flinger->createLayer(name, client, w, h, format, flags,
140                    handle, gbp);
141            return true;
142        }
143    };
144
145    sp<MessageBase> msg = new MessageCreateLayer(mFlinger.get(),
146            name, this, w, h, format, flags, handle, gbp);
147    mFlinger->postMessageSync(msg);
148    return static_cast<MessageCreateLayer*>( msg.get() )->getResult();
149}
150
151status_t Client::destroySurface(const sp<IBinder>& handle) {
152    return mFlinger->onLayerRemoved(this, handle);
153}
154
155status_t Client::clearLayerFrameStats(const sp<IBinder>& handle) const {
156    sp<Layer> layer = getLayerUser(handle);
157    if (layer == NULL) {
158        return NAME_NOT_FOUND;
159    }
160    layer->clearFrameStats();
161    return NO_ERROR;
162}
163
164status_t Client::getLayerFrameStats(const sp<IBinder>& handle, FrameStats* outStats) const {
165    sp<Layer> layer = getLayerUser(handle);
166    if (layer == NULL) {
167        return NAME_NOT_FOUND;
168    }
169    layer->getFrameStats(outStats);
170    return NO_ERROR;
171}
172
173status_t Client::getTransformToDisplayInverse(const sp<IBinder>& handle,
174        bool* outTransformToDisplayInverse) const {
175    sp<Layer> layer = getLayerUser(handle);
176    if (layer == NULL) {
177        return NAME_NOT_FOUND;
178    }
179    *outTransformToDisplayInverse = layer->getTransformToDisplayInverse();
180    return NO_ERROR;
181}
182
183// ---------------------------------------------------------------------------
184}; // namespace android
185