VirtualDisplaySurface.cpp revision 29a3e90879fd96404c971e7187cd0e05927bbce0 
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// #define LOG_NDEBUG 0
18#include "VirtualDisplaySurface.h"
19#include "HWComposer.h"
20
21// ---------------------------------------------------------------------------
22namespace android {
23// ---------------------------------------------------------------------------
24
25#if defined(FORCE_HWC_COPY_FOR_VIRTUAL_DISPLAYS)
26static const bool sForceHwcCopy = true;
27#else
28static const bool sForceHwcCopy = false;
29#endif
30
31#define VDS_LOGE(msg, ...) ALOGE("[%s] "msg, \
32        mDisplayName.string(), ##__VA_ARGS__)
33#define VDS_LOGW_IF(cond, msg, ...) ALOGW_IF(cond, "[%s] "msg, \
34        mDisplayName.string(), ##__VA_ARGS__)
35#define VDS_LOGV(msg, ...) ALOGV("[%s] "msg, \
36        mDisplayName.string(), ##__VA_ARGS__)
37
38static const char* dbgCompositionTypeStr(DisplaySurface::CompositionType type) {
39    switch (type) {
40        case DisplaySurface::COMPOSITION_UNKNOWN: return "UNKNOWN";
41        case DisplaySurface::COMPOSITION_GLES:    return "GLES";
42        case DisplaySurface::COMPOSITION_HWC:     return "HWC";
43        case DisplaySurface::COMPOSITION_MIXED:   return "MIXED";
44        default:                                  return "<INVALID>";
45    }
46}
47
48VirtualDisplaySurface::VirtualDisplaySurface(HWComposer& hwc, int32_t dispId,
49        const sp<IGraphicBufferProducer>& sink,
50        const sp<IGraphicBufferProducer>& bqProducer,
51        const sp<IGraphicBufferConsumer>& bqConsumer,
52        const String8& name)
53:   ConsumerBase(bqConsumer),
54    mHwc(hwc),
55    mDisplayId(dispId),
56    mDisplayName(name),
57    mOutputUsage(GRALLOC_USAGE_HW_COMPOSER),
58    mProducerSlotSource(0),
59    mDbgState(DBG_STATE_IDLE),
60    mDbgLastCompositionType(COMPOSITION_UNKNOWN),
61    mMustRecompose(false)
62{
63    mSource[SOURCE_SINK] = sink;
64    mSource[SOURCE_SCRATCH] = bqProducer;
65
66    resetPerFrameState();
67
68    int sinkWidth, sinkHeight;
69    sink->query(NATIVE_WINDOW_WIDTH, &sinkWidth);
70    sink->query(NATIVE_WINDOW_HEIGHT, &sinkHeight);
71
72    // Pick the buffer format to request from the sink when not rendering to it
73    // with GLES. If the consumer needs CPU access, use the default format
74    // set by the consumer. Otherwise allow gralloc to decide the format based
75    // on usage bits.
76    int sinkUsage;
77    sink->query(NATIVE_WINDOW_CONSUMER_USAGE_BITS, &sinkUsage);
78    if (sinkUsage & (GRALLOC_USAGE_SW_READ_MASK | GRALLOC_USAGE_SW_WRITE_MASK)) {
79        int sinkFormat;
80        sink->query(NATIVE_WINDOW_FORMAT, &sinkFormat);
81        mDefaultOutputFormat = sinkFormat;
82    } else {
83        mDefaultOutputFormat = HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED;
84    }
85    mOutputFormat = mDefaultOutputFormat;
86
87    ConsumerBase::mName = String8::format("VDS: %s", mDisplayName.string());
88    mConsumer->setConsumerName(ConsumerBase::mName);
89    mConsumer->setConsumerUsageBits(GRALLOC_USAGE_HW_COMPOSER);
90    mConsumer->setDefaultBufferSize(sinkWidth, sinkHeight);
91    mConsumer->setDefaultMaxBufferCount(2);
92}
93
94VirtualDisplaySurface::~VirtualDisplaySurface() {
95}
96
97status_t VirtualDisplaySurface::beginFrame(bool mustRecompose) {
98    if (mDisplayId < 0)
99        return NO_ERROR;
100
101    mMustRecompose = mustRecompose;
102
103    VDS_LOGW_IF(mDbgState != DBG_STATE_IDLE,
104            "Unexpected beginFrame() in %s state", dbgStateStr());
105    mDbgState = DBG_STATE_BEGUN;
106
107    uint32_t transformHint, numPendingBuffers;
108    mQueueBufferOutput.deflate(&mSinkBufferWidth, &mSinkBufferHeight,
109            &transformHint, &numPendingBuffers);
110
111    return refreshOutputBuffer();
112}
113
114status_t VirtualDisplaySurface::prepareFrame(CompositionType compositionType) {
115    if (mDisplayId < 0)
116        return NO_ERROR;
117
118    VDS_LOGW_IF(mDbgState != DBG_STATE_BEGUN,
119            "Unexpected prepareFrame() in %s state", dbgStateStr());
120    mDbgState = DBG_STATE_PREPARED;
121
122    mCompositionType = compositionType;
123    if (sForceHwcCopy && mCompositionType == COMPOSITION_GLES) {
124        // Some hardware can do RGB->YUV conversion more efficiently in hardware
125        // controlled by HWC than in hardware controlled by the video encoder.
126        // Forcing GLES-composed frames to go through an extra copy by the HWC
127        // allows the format conversion to happen there, rather than passing RGB
128        // directly to the consumer.
129        //
130        // On the other hand, when the consumer prefers RGB or can consume RGB
131        // inexpensively, this forces an unnecessary copy.
132        mCompositionType = COMPOSITION_MIXED;
133    }
134
135    if (mCompositionType != mDbgLastCompositionType) {
136        VDS_LOGV("prepareFrame: composition type changed to %s",
137                dbgCompositionTypeStr(mCompositionType));
138        mDbgLastCompositionType = mCompositionType;
139    }
140
141    if (mCompositionType != COMPOSITION_GLES &&
142            (mOutputFormat != mDefaultOutputFormat ||
143             mOutputUsage != GRALLOC_USAGE_HW_COMPOSER)) {
144        // We must have just switched from GLES-only to MIXED or HWC
145        // composition. Stop using the format and usage requested by the GLES
146        // driver; they may be suboptimal when HWC is writing to the output
147        // buffer. For example, if the output is going to a video encoder, and
148        // HWC can write directly to YUV, some hardware can skip a
149        // memory-to-memory RGB-to-YUV conversion step.
150        //
151        // If we just switched *to* GLES-only mode, we'll change the
152        // format/usage and get a new buffer when the GLES driver calls
153        // dequeueBuffer().
154        mOutputFormat = mDefaultOutputFormat;
155        mOutputUsage = GRALLOC_USAGE_HW_COMPOSER;
156        refreshOutputBuffer();
157    }
158
159    return NO_ERROR;
160}
161
162status_t VirtualDisplaySurface::compositionComplete() {
163    return NO_ERROR;
164}
165
166status_t VirtualDisplaySurface::advanceFrame() {
167    if (mDisplayId < 0)
168        return NO_ERROR;
169
170    if (mCompositionType == COMPOSITION_HWC) {
171        VDS_LOGW_IF(mDbgState != DBG_STATE_PREPARED,
172                "Unexpected advanceFrame() in %s state on HWC frame",
173                dbgStateStr());
174    } else {
175        VDS_LOGW_IF(mDbgState != DBG_STATE_GLES_DONE,
176                "Unexpected advanceFrame() in %s state on GLES/MIXED frame",
177                dbgStateStr());
178    }
179    mDbgState = DBG_STATE_HWC;
180
181    if (mOutputProducerSlot < 0 ||
182            (mCompositionType != COMPOSITION_HWC && mFbProducerSlot < 0)) {
183        // Last chance bailout if something bad happened earlier. For example,
184        // in a GLES configuration, if the sink disappears then dequeueBuffer
185        // will fail, the GLES driver won't queue a buffer, but SurfaceFlinger
186        // will soldier on. So we end up here without a buffer. There should
187        // be lots of scary messages in the log just before this.
188        VDS_LOGE("advanceFrame: no buffer, bailing out");
189        return NO_MEMORY;
190    }
191
192    sp<GraphicBuffer> fbBuffer = mFbProducerSlot >= 0 ?
193            mProducerBuffers[mFbProducerSlot] : sp<GraphicBuffer>(NULL);
194    sp<GraphicBuffer> outBuffer = mProducerBuffers[mOutputProducerSlot];
195    VDS_LOGV("advanceFrame: fb=%d(%p) out=%d(%p)",
196            mFbProducerSlot, fbBuffer.get(),
197            mOutputProducerSlot, outBuffer.get());
198
199    // At this point we know the output buffer acquire fence,
200    // so update HWC state with it.
201    mHwc.setOutputBuffer(mDisplayId, mOutputFence, outBuffer);
202
203    status_t result = NO_ERROR;
204    if (fbBuffer != NULL) {
205        result = mHwc.fbPost(mDisplayId, mFbFence, fbBuffer);
206    }
207
208    return result;
209}
210
211void VirtualDisplaySurface::onFrameCommitted() {
212    if (mDisplayId < 0)
213        return;
214
215    VDS_LOGW_IF(mDbgState != DBG_STATE_HWC,
216            "Unexpected onFrameCommitted() in %s state", dbgStateStr());
217    mDbgState = DBG_STATE_IDLE;
218
219    sp<Fence> fbFence = mHwc.getAndResetReleaseFence(mDisplayId);
220    if (mCompositionType == COMPOSITION_MIXED && mFbProducerSlot >= 0) {
221        // release the scratch buffer back to the pool
222        Mutex::Autolock lock(mMutex);
223        int sslot = mapProducer2SourceSlot(SOURCE_SCRATCH, mFbProducerSlot);
224        VDS_LOGV("onFrameCommitted: release scratch sslot=%d", sslot);
225        addReleaseFenceLocked(sslot, mProducerBuffers[mFbProducerSlot], fbFence);
226        releaseBufferLocked(sslot, mProducerBuffers[mFbProducerSlot],
227                EGL_NO_DISPLAY, EGL_NO_SYNC_KHR);
228    }
229
230    if (mOutputProducerSlot >= 0) {
231        int sslot = mapProducer2SourceSlot(SOURCE_SINK, mOutputProducerSlot);
232        QueueBufferOutput qbo;
233        sp<Fence> outFence = mHwc.getLastRetireFence(mDisplayId);
234        VDS_LOGV("onFrameCommitted: queue sink sslot=%d", sslot);
235        if (mMustRecompose) {
236            status_t result = mSource[SOURCE_SINK]->queueBuffer(sslot,
237                    QueueBufferInput(
238                        systemTime(), false /* isAutoTimestamp */,
239                        Rect(mSinkBufferWidth, mSinkBufferHeight),
240                        NATIVE_WINDOW_SCALING_MODE_FREEZE, 0 /* transform */,
241                        true /* async*/,
242                        outFence),
243                    &qbo);
244            if (result == NO_ERROR) {
245                updateQueueBufferOutput(qbo);
246            }
247        } else {
248            // If the surface hadn't actually been updated, then we only went
249            // through the motions of updating the display to keep our state
250            // machine happy. We cancel the buffer to avoid triggering another
251            // re-composition and causing an infinite loop.
252            mSource[SOURCE_SINK]->cancelBuffer(sslot, outFence);
253        }
254    }
255
256    resetPerFrameState();
257}
258
259void VirtualDisplaySurface::dump(String8& /* result */) const {
260}
261
262status_t VirtualDisplaySurface::requestBuffer(int pslot,
263        sp<GraphicBuffer>* outBuf) {
264    VDS_LOGW_IF(mDbgState != DBG_STATE_GLES,
265            "Unexpected requestBuffer pslot=%d in %s state",
266            pslot, dbgStateStr());
267
268    *outBuf = mProducerBuffers[pslot];
269    return NO_ERROR;
270}
271
272status_t VirtualDisplaySurface::setBufferCount(int bufferCount) {
273    return mSource[SOURCE_SINK]->setBufferCount(bufferCount);
274}
275
276status_t VirtualDisplaySurface::dequeueBuffer(Source source,
277        uint32_t format, uint32_t usage, int* sslot, sp<Fence>* fence) {
278    // Don't let a slow consumer block us
279    bool async = (source == SOURCE_SINK);
280
281    status_t result = mSource[source]->dequeueBuffer(sslot, fence, async,
282            mSinkBufferWidth, mSinkBufferHeight, format, usage);
283    if (result < 0)
284        return result;
285    int pslot = mapSource2ProducerSlot(source, *sslot);
286    VDS_LOGV("dequeueBuffer(%s): sslot=%d pslot=%d result=%d",
287            dbgSourceStr(source), *sslot, pslot, result);
288    uint64_t sourceBit = static_cast<uint64_t>(source) << pslot;
289
290    if ((mProducerSlotSource & (1ULL << pslot)) != sourceBit) {
291        // This slot was previously dequeued from the other source; must
292        // re-request the buffer.
293        result |= BUFFER_NEEDS_REALLOCATION;
294        mProducerSlotSource &= ~(1ULL << pslot);
295        mProducerSlotSource |= sourceBit;
296    }
297
298    if (result & RELEASE_ALL_BUFFERS) {
299        for (uint32_t i = 0; i < BufferQueue::NUM_BUFFER_SLOTS; i++) {
300            if ((mProducerSlotSource & (1ULL << i)) == sourceBit)
301                mProducerBuffers[i].clear();
302        }
303    }
304    if (result & BUFFER_NEEDS_REALLOCATION) {
305        result = mSource[source]->requestBuffer(*sslot, &mProducerBuffers[pslot]);
306        if (result < 0) {
307            mProducerBuffers[pslot].clear();
308            mSource[source]->cancelBuffer(*sslot, *fence);
309            return result;
310        }
311        VDS_LOGV("dequeueBuffer(%s): buffers[%d]=%p fmt=%d usage=%#x",
312                dbgSourceStr(source), pslot, mProducerBuffers[pslot].get(),
313                mProducerBuffers[pslot]->getPixelFormat(),
314                mProducerBuffers[pslot]->getUsage());
315    }
316
317    return result;
318}
319
320status_t VirtualDisplaySurface::dequeueBuffer(int* pslot, sp<Fence>* fence, bool async,
321        uint32_t w, uint32_t h, uint32_t format, uint32_t usage) {
322    VDS_LOGW_IF(mDbgState != DBG_STATE_PREPARED,
323            "Unexpected dequeueBuffer() in %s state", dbgStateStr());
324    mDbgState = DBG_STATE_GLES;
325
326    VDS_LOGW_IF(!async, "EGL called dequeueBuffer with !async despite eglSwapInterval(0)");
327    VDS_LOGV("dequeueBuffer %dx%d fmt=%d usage=%#x", w, h, format, usage);
328
329    status_t result = NO_ERROR;
330    Source source = fbSourceForCompositionType(mCompositionType);
331
332    if (source == SOURCE_SINK) {
333
334        if (mOutputProducerSlot < 0) {
335            // Last chance bailout if something bad happened earlier. For example,
336            // in a GLES configuration, if the sink disappears then dequeueBuffer
337            // will fail, the GLES driver won't queue a buffer, but SurfaceFlinger
338            // will soldier on. So we end up here without a buffer. There should
339            // be lots of scary messages in the log just before this.
340            VDS_LOGE("dequeueBuffer: no buffer, bailing out");
341            return NO_MEMORY;
342        }
343
344        // We already dequeued the output buffer. If the GLES driver wants
345        // something incompatible, we have to cancel and get a new one. This
346        // will mean that HWC will see a different output buffer between
347        // prepare and set, but since we're in GLES-only mode already it
348        // shouldn't matter.
349
350        usage |= GRALLOC_USAGE_HW_COMPOSER;
351        const sp<GraphicBuffer>& buf = mProducerBuffers[mOutputProducerSlot];
352        if ((usage & ~buf->getUsage()) != 0 ||
353                (format != 0 && format != (uint32_t)buf->getPixelFormat()) ||
354                (w != 0 && w != mSinkBufferWidth) ||
355                (h != 0 && h != mSinkBufferHeight)) {
356            VDS_LOGV("dequeueBuffer: dequeueing new output buffer: "
357                    "want %dx%d fmt=%d use=%#x, "
358                    "have %dx%d fmt=%d use=%#x",
359                    w, h, format, usage,
360                    mSinkBufferWidth, mSinkBufferHeight,
361                    buf->getPixelFormat(), buf->getUsage());
362            mOutputFormat = format;
363            mOutputUsage = usage;
364            result = refreshOutputBuffer();
365            if (result < 0)
366                return result;
367        }
368    }
369
370    if (source == SOURCE_SINK) {
371        *pslot = mOutputProducerSlot;
372        *fence = mOutputFence;
373    } else {
374        int sslot;
375        result = dequeueBuffer(source, format, usage, &sslot, fence);
376        if (result >= 0) {
377            *pslot = mapSource2ProducerSlot(source, sslot);
378        }
379    }
380    return result;
381}
382
383status_t VirtualDisplaySurface::detachBuffer(int /* slot */) {
384    VDS_LOGE("detachBuffer is not available for VirtualDisplaySurface");
385    return INVALID_OPERATION;
386}
387
388status_t VirtualDisplaySurface::detachNextBuffer(
389        sp<GraphicBuffer>* /* outBuffer */, sp<Fence>* /* outFence */) {
390    VDS_LOGE("detachNextBuffer is not available for VirtualDisplaySurface");
391    return INVALID_OPERATION;
392}
393
394status_t VirtualDisplaySurface::attachBuffer(int* /* outSlot */,
395        const sp<GraphicBuffer>& /* buffer */) {
396    VDS_LOGE("attachBuffer is not available for VirtualDisplaySurface");
397    return INVALID_OPERATION;
398}
399
400status_t VirtualDisplaySurface::queueBuffer(int pslot,
401        const QueueBufferInput& input, QueueBufferOutput* output) {
402    VDS_LOGW_IF(mDbgState != DBG_STATE_GLES,
403            "Unexpected queueBuffer(pslot=%d) in %s state", pslot,
404            dbgStateStr());
405    mDbgState = DBG_STATE_GLES_DONE;
406
407    VDS_LOGV("queueBuffer pslot=%d", pslot);
408
409    status_t result;
410    if (mCompositionType == COMPOSITION_MIXED) {
411        // Queue the buffer back into the scratch pool
412        QueueBufferOutput scratchQBO;
413        int sslot = mapProducer2SourceSlot(SOURCE_SCRATCH, pslot);
414        result = mSource[SOURCE_SCRATCH]->queueBuffer(sslot, input, &scratchQBO);
415        if (result != NO_ERROR)
416            return result;
417
418        // Now acquire the buffer from the scratch pool -- should be the same
419        // slot and fence as we just queued.
420        Mutex::Autolock lock(mMutex);
421        BufferQueue::BufferItem item;
422        result = acquireBufferLocked(&item, 0);
423        if (result != NO_ERROR)
424            return result;
425        VDS_LOGW_IF(item.mBuf != sslot,
426                "queueBuffer: acquired sslot %d from SCRATCH after queueing sslot %d",
427                item.mBuf, sslot);
428        mFbProducerSlot = mapSource2ProducerSlot(SOURCE_SCRATCH, item.mBuf);
429        mFbFence = mSlots[item.mBuf].mFence;
430
431    } else {
432        LOG_FATAL_IF(mCompositionType != COMPOSITION_GLES,
433                "Unexpected queueBuffer in state %s for compositionType %s",
434                dbgStateStr(), dbgCompositionTypeStr(mCompositionType));
435
436        // Extract the GLES release fence for HWC to acquire
437        int64_t timestamp;
438        bool isAutoTimestamp;
439        Rect crop;
440        int scalingMode;
441        uint32_t transform;
442        bool async;
443        input.deflate(&timestamp, &isAutoTimestamp, &crop, &scalingMode,
444                &transform, &async, &mFbFence);
445
446        mFbProducerSlot = pslot;
447        mOutputFence = mFbFence;
448    }
449
450    *output = mQueueBufferOutput;
451    return NO_ERROR;
452}
453
454void VirtualDisplaySurface::cancelBuffer(int pslot, const sp<Fence>& fence) {
455    VDS_LOGW_IF(mDbgState != DBG_STATE_GLES,
456            "Unexpected cancelBuffer(pslot=%d) in %s state", pslot,
457            dbgStateStr());
458    VDS_LOGV("cancelBuffer pslot=%d", pslot);
459    Source source = fbSourceForCompositionType(mCompositionType);
460    return mSource[source]->cancelBuffer(
461            mapProducer2SourceSlot(source, pslot), fence);
462}
463
464int VirtualDisplaySurface::query(int what, int* value) {
465    return mSource[SOURCE_SINK]->query(what, value);
466}
467
468status_t VirtualDisplaySurface::connect(const sp<IProducerListener>& listener,
469        int api, bool producerControlledByApp,
470        QueueBufferOutput* output) {
471    QueueBufferOutput qbo;
472    status_t result = mSource[SOURCE_SINK]->connect(listener, api,
473            producerControlledByApp, &qbo);
474    if (result == NO_ERROR) {
475        updateQueueBufferOutput(qbo);
476        *output = mQueueBufferOutput;
477    }
478    return result;
479}
480
481status_t VirtualDisplaySurface::disconnect(int api) {
482    return mSource[SOURCE_SINK]->disconnect(api);
483}
484
485status_t VirtualDisplaySurface::setSidebandStream(const sp<NativeHandle>& /*stream*/) {
486    return INVALID_OPERATION;
487}
488
489void VirtualDisplaySurface::allocateBuffers(bool /* async */,
490        uint32_t /* width */, uint32_t /* height */, uint32_t /* format */,
491        uint32_t /* usage */) {
492    // TODO: Should we actually allocate buffers for a virtual display?
493}
494
495void VirtualDisplaySurface::updateQueueBufferOutput(
496        const QueueBufferOutput& qbo) {
497    uint32_t w, h, transformHint, numPendingBuffers;
498    qbo.deflate(&w, &h, &transformHint, &numPendingBuffers);
499    mQueueBufferOutput.inflate(w, h, 0, numPendingBuffers);
500}
501
502void VirtualDisplaySurface::resetPerFrameState() {
503    mCompositionType = COMPOSITION_UNKNOWN;
504    mSinkBufferWidth = 0;
505    mSinkBufferHeight = 0;
506    mFbFence = Fence::NO_FENCE;
507    mOutputFence = Fence::NO_FENCE;
508    mOutputProducerSlot = -1;
509    mFbProducerSlot = -1;
510}
511
512status_t VirtualDisplaySurface::refreshOutputBuffer() {
513    if (mOutputProducerSlot >= 0) {
514        mSource[SOURCE_SINK]->cancelBuffer(
515                mapProducer2SourceSlot(SOURCE_SINK, mOutputProducerSlot),
516                mOutputFence);
517    }
518
519    int sslot;
520    status_t result = dequeueBuffer(SOURCE_SINK, mOutputFormat, mOutputUsage,
521            &sslot, &mOutputFence);
522    if (result < 0)
523        return result;
524    mOutputProducerSlot = mapSource2ProducerSlot(SOURCE_SINK, sslot);
525
526    // On GLES-only frames, we don't have the right output buffer acquire fence
527    // until after GLES calls queueBuffer(). So here we just set the buffer
528    // (for use in HWC prepare) but not the fence; we'll call this again with
529    // the proper fence once we have it.
530    result = mHwc.setOutputBuffer(mDisplayId, Fence::NO_FENCE,
531            mProducerBuffers[mOutputProducerSlot]);
532
533    return result;
534}
535
536// This slot mapping function is its own inverse, so two copies are unnecessary.
537// Both are kept to make the intent clear where the function is called, and for
538// the (unlikely) chance that we switch to a different mapping function.
539int VirtualDisplaySurface::mapSource2ProducerSlot(Source source, int sslot) {
540    if (source == SOURCE_SCRATCH) {
541        return BufferQueue::NUM_BUFFER_SLOTS - sslot - 1;
542    } else {
543        return sslot;
544    }
545}
546int VirtualDisplaySurface::mapProducer2SourceSlot(Source source, int pslot) {
547    return mapSource2ProducerSlot(source, pslot);
548}
549
550VirtualDisplaySurface::Source
551VirtualDisplaySurface::fbSourceForCompositionType(CompositionType type) {
552    return type == COMPOSITION_MIXED ? SOURCE_SCRATCH : SOURCE_SINK;
553}
554
555const char* VirtualDisplaySurface::dbgStateStr() const {
556    switch (mDbgState) {
557        case DBG_STATE_IDLE:      return "IDLE";
558        case DBG_STATE_PREPARED:  return "PREPARED";
559        case DBG_STATE_GLES:      return "GLES";
560        case DBG_STATE_GLES_DONE: return "GLES_DONE";
561        case DBG_STATE_HWC:       return "HWC";
562        default:                  return "INVALID";
563    }
564}
565
566const char* VirtualDisplaySurface::dbgSourceStr(Source s) {
567    switch (s) {
568        case SOURCE_SINK:    return "SINK";
569        case SOURCE_SCRATCH: return "SCRATCH";
570        default:             return "INVALID";
571    }
572}
573
574// ---------------------------------------------------------------------------
575} // namespace android
576// ---------------------------------------------------------------------------
577