SurfaceControl.cpp revision 4cdc58f6840d15b4952149d2b345ec1f97d505bc 
1/*
2 * Copyright (C) 2007 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#define LOG_TAG "SurfaceControl"
18
19#include <stdint.h>
20#include <errno.h>
21#include <sys/types.h>
22#include <sys/stat.h>
23
24#include <android/native_window.h>
25
26#include <utils/Errors.h>
27#include <utils/Log.h>
28#include <utils/threads.h>
29
30#include <binder/IPCThreadState.h>
31
32#include <ui/DisplayInfo.h>
33#include <ui/GraphicBuffer.h>
34#include <ui/Rect.h>
35
36#include <gui/BufferQueueCore.h>
37#include <gui/ISurfaceComposer.h>
38#include <gui/Surface.h>
39#include <gui/SurfaceComposerClient.h>
40#include <gui/SurfaceControl.h>
41
42namespace android {
43
44// ============================================================================
45//  SurfaceControl
46// ============================================================================
47
48SurfaceControl::SurfaceControl(
49        const sp<SurfaceComposerClient>& client,
50        const sp<IBinder>& handle,
51        const sp<IGraphicBufferProducer>& gbp)
52    : mClient(client), mHandle(handle), mGraphicBufferProducer(gbp)
53{
54}
55
56SurfaceControl::~SurfaceControl()
57{
58    destroy();
59}
60
61void SurfaceControl::destroy()
62{
63    if (isValid()) {
64        mClient->destroySurface(mHandle);
65    }
66    // clear all references and trigger an IPC now, to make sure things
67    // happen without delay, since these resources are quite heavy.
68    mClient.clear();
69    mHandle.clear();
70    mGraphicBufferProducer.clear();
71    IPCThreadState::self()->flushCommands();
72}
73
74void SurfaceControl::clear()
75{
76    // here, the window manager tells us explicitly that we should destroy
77    // the surface's resource. Soon after this call, it will also release
78    // its last reference (which will call the dtor); however, it is possible
79    // that a client living in the same process still holds references which
80    // would delay the call to the dtor -- that is why we need this explicit
81    // "clear()" call.
82    destroy();
83}
84
85void SurfaceControl::disconnect() {
86    if (mGraphicBufferProducer != NULL) {
87        mGraphicBufferProducer->disconnect(
88                BufferQueueCore::CURRENTLY_CONNECTED_API);
89    }
90}
91
92bool SurfaceControl::isSameSurface(
93        const sp<SurfaceControl>& lhs, const sp<SurfaceControl>& rhs)
94{
95    if (lhs == 0 || rhs == 0)
96        return false;
97    return lhs->mHandle == rhs->mHandle;
98}
99
100status_t SurfaceControl::clearLayerFrameStats() const {
101    status_t err = validate();
102    if (err < 0) return err;
103    const sp<SurfaceComposerClient>& client(mClient);
104    return client->clearLayerFrameStats(mHandle);
105}
106
107status_t SurfaceControl::getLayerFrameStats(FrameStats* outStats) const {
108    status_t err = validate();
109    if (err < 0) return err;
110    const sp<SurfaceComposerClient>& client(mClient);
111    return client->getLayerFrameStats(mHandle, outStats);
112}
113
114status_t SurfaceControl::validate() const
115{
116    if (mHandle==0 || mClient==0) {
117        ALOGE("invalid handle (%p) or client (%p)",
118                mHandle.get(), mClient.get());
119        return NO_INIT;
120    }
121    return NO_ERROR;
122}
123
124status_t SurfaceControl::writeSurfaceToParcel(
125        const sp<SurfaceControl>& control, Parcel* parcel)
126{
127    sp<IGraphicBufferProducer> bp;
128    if (control != NULL) {
129        bp = control->mGraphicBufferProducer;
130    }
131    return parcel->writeStrongBinder(IInterface::asBinder(bp));
132}
133
134sp<Surface> SurfaceControl::generateSurfaceLocked() const
135{
136    // This surface is always consumed by SurfaceFlinger, so the
137    // producerControlledByApp value doesn't matter; using false.
138    mSurfaceData = new Surface(mGraphicBufferProducer, false);
139
140    return mSurfaceData;
141}
142
143sp<Surface> SurfaceControl::getSurface() const
144{
145    Mutex::Autolock _l(mLock);
146    if (mSurfaceData == 0) {
147        return generateSurfaceLocked();
148    }
149    return mSurfaceData;
150}
151
152sp<Surface> SurfaceControl::createSurface() const
153{
154    Mutex::Autolock _l(mLock);
155    return generateSurfaceLocked();
156}
157
158sp<IBinder> SurfaceControl::getHandle() const
159{
160    Mutex::Autolock lock(mLock);
161    return mHandle;
162}
163
164sp<SurfaceComposerClient> SurfaceControl::getClient() const
165{
166    return mClient;
167}
168
169// ----------------------------------------------------------------------------
170}; // namespace android
171