VirtualDisplaySurface.cpp revision 80e0a397a4712666661ecc629a64ec26e7f6aac3 
1/*
2 * Copyright 2013 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 "VirtualDisplaySurface.h"
18#include "HWComposer.h"
19
20// ---------------------------------------------------------------------------
21namespace android {
22// ---------------------------------------------------------------------------
23
24VirtualDisplaySurface::VirtualDisplaySurface(HWComposer& hwc, int disp,
25        const sp<IGraphicBufferProducer>& sink, const String8& name)
26:   mHwc(hwc),
27    mDisplayId(disp),
28    mSource(new BufferQueueInterposer(sink, name)),
29    mName(name),
30    mReleaseFence(Fence::NO_FENCE)
31{}
32
33VirtualDisplaySurface::~VirtualDisplaySurface() {
34    if (mAcquiredBuffer != NULL) {
35        status_t result = mSource->releaseBuffer(mReleaseFence);
36        ALOGE_IF(result != NO_ERROR, "VirtualDisplaySurface \"%s\": "
37                "failed to release previous buffer: %d",
38                mName.string(), result);
39    }
40}
41
42sp<IGraphicBufferProducer> VirtualDisplaySurface::getIGraphicBufferProducer() const {
43    return mSource;
44}
45
46status_t VirtualDisplaySurface::compositionComplete() {
47    return NO_ERROR;
48}
49
50status_t VirtualDisplaySurface::advanceFrame() {
51    Mutex::Autolock lock(mMutex);
52    status_t result = NO_ERROR;
53
54    if (mAcquiredBuffer != NULL) {
55        result = mSource->releaseBuffer(mReleaseFence);
56        ALOGE_IF(result != NO_ERROR, "VirtualDisplaySurface \"%s\": "
57                "failed to release previous buffer: %d",
58                mName.string(), result);
59        mAcquiredBuffer.clear();
60        mReleaseFence = Fence::NO_FENCE;
61    }
62
63    sp<Fence> fence;
64    result = mSource->acquireBuffer(&mAcquiredBuffer, &fence);
65    if (result == BufferQueueInterposer::NO_BUFFER_AVAILABLE) {
66        result = mSource->pullEmptyBuffer();
67        if (result != NO_ERROR)
68            return result;
69        result = mSource->acquireBuffer(&mAcquiredBuffer, &fence);
70    }
71    if (result != NO_ERROR)
72        return result;
73
74    return mHwc.fbPost(mDisplayId, fence, mAcquiredBuffer);
75}
76
77status_t VirtualDisplaySurface::setReleaseFenceFd(int fenceFd) {
78    if (fenceFd >= 0) {
79        sp<Fence> fence(new Fence(fenceFd));
80        Mutex::Autolock lock(mMutex);
81        sp<Fence> mergedFence = Fence::merge(
82                String8::format("VirtualDisplaySurface \"%s\"",
83                        mName.string()),
84                mReleaseFence, fence);
85        if (!mergedFence->isValid()) {
86            ALOGE("VirtualDisplaySurface \"%s\": failed to merge release fence",
87                    mName.string());
88            // synchronization is broken, the best we can do is hope fences
89            // signal in order so the new fence will act like a union
90            mReleaseFence = fence;
91            return BAD_VALUE;
92        }
93        mReleaseFence = mergedFence;
94    }
95    return NO_ERROR;
96}
97
98void VirtualDisplaySurface::dump(String8& result) const {
99}
100
101// ---------------------------------------------------------------------------
102} // namespace android
103// ---------------------------------------------------------------------------
104