Surface.cpp revision 006a601f22b275bcabf608f630b321df027d56d1 
1/*
2 * Copyright (C) 2010 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 "Surface"
18#define ATRACE_TAG ATRACE_TAG_GRAPHICS
19//#define LOG_NDEBUG 0
20
21#include <android/native_window.h>
22
23#include <binder/Parcel.h>
24
25#include <utils/Log.h>
26#include <utils/Trace.h>
27
28#include <ui/Fence.h>
29
30#include <gui/ISurfaceComposer.h>
31#include <gui/SurfaceComposerClient.h>
32#include <gui/GLConsumer.h>
33#include <gui/Surface.h>
34
35#include <private/gui/ComposerService.h>
36
37namespace android {
38
39Surface::Surface(
40        const sp<IGraphicBufferProducer>& bufferProducer)
41{
42    Surface::init();
43    Surface::setIGraphicBufferProducer(bufferProducer);
44}
45
46Surface::Surface() {
47    Surface::init();
48}
49
50Surface::~Surface() {
51    if (mConnectedToCpu) {
52        Surface::disconnect(NATIVE_WINDOW_API_CPU);
53    }
54}
55
56void Surface::init() {
57    // Initialize the ANativeWindow function pointers.
58    ANativeWindow::setSwapInterval  = hook_setSwapInterval;
59    ANativeWindow::dequeueBuffer    = hook_dequeueBuffer;
60    ANativeWindow::cancelBuffer     = hook_cancelBuffer;
61    ANativeWindow::queueBuffer      = hook_queueBuffer;
62    ANativeWindow::query            = hook_query;
63    ANativeWindow::perform          = hook_perform;
64
65    ANativeWindow::dequeueBuffer_DEPRECATED = hook_dequeueBuffer_DEPRECATED;
66    ANativeWindow::cancelBuffer_DEPRECATED  = hook_cancelBuffer_DEPRECATED;
67    ANativeWindow::lockBuffer_DEPRECATED    = hook_lockBuffer_DEPRECATED;
68    ANativeWindow::queueBuffer_DEPRECATED   = hook_queueBuffer_DEPRECATED;
69
70    const_cast<int&>(ANativeWindow::minSwapInterval) = 0;
71    const_cast<int&>(ANativeWindow::maxSwapInterval) = 1;
72
73    mReqWidth = 0;
74    mReqHeight = 0;
75    mReqFormat = 0;
76    mReqUsage = 0;
77    mTimestamp = NATIVE_WINDOW_TIMESTAMP_AUTO;
78    mCrop.clear();
79    mScalingMode = NATIVE_WINDOW_SCALING_MODE_FREEZE;
80    mTransform = 0;
81    mDefaultWidth = 0;
82    mDefaultHeight = 0;
83    mUserWidth = 0;
84    mUserHeight = 0;
85    mTransformHint = 0;
86    mConsumerRunningBehind = false;
87    mConnectedToCpu = false;
88}
89
90void Surface::setIGraphicBufferProducer(
91        const sp<IGraphicBufferProducer>& bufferProducer)
92{
93    mGraphicBufferProducer = bufferProducer;
94}
95
96sp<IGraphicBufferProducer> Surface::getIGraphicBufferProducer() const {
97    return mGraphicBufferProducer;
98}
99
100int Surface::hook_setSwapInterval(ANativeWindow* window, int interval) {
101    Surface* c = getSelf(window);
102    return c->setSwapInterval(interval);
103}
104
105int Surface::hook_dequeueBuffer(ANativeWindow* window,
106        ANativeWindowBuffer** buffer, int* fenceFd) {
107    Surface* c = getSelf(window);
108    return c->dequeueBuffer(buffer, fenceFd);
109}
110
111int Surface::hook_cancelBuffer(ANativeWindow* window,
112        ANativeWindowBuffer* buffer, int fenceFd) {
113    Surface* c = getSelf(window);
114    return c->cancelBuffer(buffer, fenceFd);
115}
116
117int Surface::hook_queueBuffer(ANativeWindow* window,
118        ANativeWindowBuffer* buffer, int fenceFd) {
119    Surface* c = getSelf(window);
120    return c->queueBuffer(buffer, fenceFd);
121}
122
123int Surface::hook_dequeueBuffer_DEPRECATED(ANativeWindow* window,
124        ANativeWindowBuffer** buffer) {
125    Surface* c = getSelf(window);
126    ANativeWindowBuffer* buf;
127    int fenceFd = -1;
128    int result = c->dequeueBuffer(&buf, &fenceFd);
129    sp<Fence> fence(new Fence(fenceFd));
130    int waitResult = fence->waitForever(1000, "dequeueBuffer_DEPRECATED");
131    if (waitResult != OK) {
132        ALOGE("dequeueBuffer_DEPRECATED: Fence::wait returned an error: %d",
133                waitResult);
134        c->cancelBuffer(buf, -1);
135        return waitResult;
136    }
137    *buffer = buf;
138    return result;
139}
140
141int Surface::hook_cancelBuffer_DEPRECATED(ANativeWindow* window,
142        ANativeWindowBuffer* buffer) {
143    Surface* c = getSelf(window);
144    return c->cancelBuffer(buffer, -1);
145}
146
147int Surface::hook_lockBuffer_DEPRECATED(ANativeWindow* window,
148        ANativeWindowBuffer* buffer) {
149    Surface* c = getSelf(window);
150    return c->lockBuffer_DEPRECATED(buffer);
151}
152
153int Surface::hook_queueBuffer_DEPRECATED(ANativeWindow* window,
154        ANativeWindowBuffer* buffer) {
155    Surface* c = getSelf(window);
156    return c->queueBuffer(buffer, -1);
157}
158
159int Surface::hook_query(const ANativeWindow* window,
160                                int what, int* value) {
161    const Surface* c = getSelf(window);
162    return c->query(what, value);
163}
164
165int Surface::hook_perform(ANativeWindow* window, int operation, ...) {
166    va_list args;
167    va_start(args, operation);
168    Surface* c = getSelf(window);
169    return c->perform(operation, args);
170}
171
172int Surface::setSwapInterval(int interval) {
173    ATRACE_CALL();
174    // EGL specification states:
175    //  interval is silently clamped to minimum and maximum implementation
176    //  dependent values before being stored.
177    // Although we don't have to, we apply the same logic here.
178
179    if (interval < minSwapInterval)
180        interval = minSwapInterval;
181
182    if (interval > maxSwapInterval)
183        interval = maxSwapInterval;
184
185    status_t res = mGraphicBufferProducer->setSynchronousMode(interval ? true : false);
186
187    return res;
188}
189
190int Surface::dequeueBuffer(android_native_buffer_t** buffer,
191        int* fenceFd) {
192    ATRACE_CALL();
193    ALOGV("Surface::dequeueBuffer");
194    Mutex::Autolock lock(mMutex);
195    int buf = -1;
196    int reqW = mReqWidth ? mReqWidth : mUserWidth;
197    int reqH = mReqHeight ? mReqHeight : mUserHeight;
198    sp<Fence> fence;
199    status_t result = mGraphicBufferProducer->dequeueBuffer(&buf, fence, reqW, reqH,
200            mReqFormat, mReqUsage);
201    if (result < 0) {
202        ALOGV("dequeueBuffer: IGraphicBufferProducer::dequeueBuffer(%d, %d, %d, %d)"
203             "failed: %d", mReqWidth, mReqHeight, mReqFormat, mReqUsage,
204             result);
205        return result;
206    }
207    sp<GraphicBuffer>& gbuf(mSlots[buf].buffer);
208    if (result & IGraphicBufferProducer::RELEASE_ALL_BUFFERS) {
209        freeAllBuffers();
210    }
211
212    if ((result & IGraphicBufferProducer::BUFFER_NEEDS_REALLOCATION) || gbuf == 0) {
213        result = mGraphicBufferProducer->requestBuffer(buf, &gbuf);
214        if (result != NO_ERROR) {
215            ALOGE("dequeueBuffer: IGraphicBufferProducer::requestBuffer failed: %d",
216                    result);
217            return result;
218        }
219    }
220
221    if (fence->isValid()) {
222        *fenceFd = fence->dup();
223        if (*fenceFd == -1) {
224            ALOGE("dequeueBuffer: error duping fence: %d", errno);
225            // dup() should never fail; something is badly wrong. Soldier on
226            // and hope for the best; the worst that should happen is some
227            // visible corruption that lasts until the next frame.
228        }
229    } else {
230        *fenceFd = -1;
231    }
232
233    *buffer = gbuf.get();
234    return OK;
235}
236
237int Surface::cancelBuffer(android_native_buffer_t* buffer,
238        int fenceFd) {
239    ATRACE_CALL();
240    ALOGV("Surface::cancelBuffer");
241    Mutex::Autolock lock(mMutex);
242    int i = getSlotFromBufferLocked(buffer);
243    if (i < 0) {
244        return i;
245    }
246    sp<Fence> fence(fenceFd >= 0 ? new Fence(fenceFd) : Fence::NO_FENCE);
247    mGraphicBufferProducer->cancelBuffer(i, fence);
248    return OK;
249}
250
251int Surface::getSlotFromBufferLocked(
252        android_native_buffer_t* buffer) const {
253    bool dumpedState = false;
254    for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
255        if (mSlots[i].buffer != NULL &&
256                mSlots[i].buffer->handle == buffer->handle) {
257            return i;
258        }
259    }
260    ALOGE("getSlotFromBufferLocked: unknown buffer: %p", buffer->handle);
261    return BAD_VALUE;
262}
263
264int Surface::lockBuffer_DEPRECATED(android_native_buffer_t* buffer) {
265    ALOGV("Surface::lockBuffer");
266    Mutex::Autolock lock(mMutex);
267    return OK;
268}
269
270int Surface::queueBuffer(android_native_buffer_t* buffer, int fenceFd) {
271    ATRACE_CALL();
272    ALOGV("Surface::queueBuffer");
273    Mutex::Autolock lock(mMutex);
274    int64_t timestamp;
275    if (mTimestamp == NATIVE_WINDOW_TIMESTAMP_AUTO) {
276        timestamp = systemTime(SYSTEM_TIME_MONOTONIC);
277        ALOGV("Surface::queueBuffer making up timestamp: %.2f ms",
278             timestamp / 1000000.f);
279    } else {
280        timestamp = mTimestamp;
281    }
282    int i = getSlotFromBufferLocked(buffer);
283    if (i < 0) {
284        return i;
285    }
286
287
288    // Make sure the crop rectangle is entirely inside the buffer.
289    Rect crop;
290    mCrop.intersect(Rect(buffer->width, buffer->height), &crop);
291
292    sp<Fence> fence(fenceFd >= 0 ? new Fence(fenceFd) : Fence::NO_FENCE);
293    IGraphicBufferProducer::QueueBufferOutput output;
294    IGraphicBufferProducer::QueueBufferInput input(timestamp, crop, mScalingMode,
295            mTransform, fence);
296    status_t err = mGraphicBufferProducer->queueBuffer(i, input, &output);
297    if (err != OK)  {
298        ALOGE("queueBuffer: error queuing buffer to SurfaceTexture, %d", err);
299    }
300    uint32_t numPendingBuffers = 0;
301    output.deflate(&mDefaultWidth, &mDefaultHeight, &mTransformHint,
302            &numPendingBuffers);
303
304    mConsumerRunningBehind = (numPendingBuffers >= 2);
305
306    return err;
307}
308
309int Surface::query(int what, int* value) const {
310    ATRACE_CALL();
311    ALOGV("Surface::query");
312    { // scope for the lock
313        Mutex::Autolock lock(mMutex);
314        switch (what) {
315            case NATIVE_WINDOW_FORMAT:
316                if (mReqFormat) {
317                    *value = mReqFormat;
318                    return NO_ERROR;
319                }
320                break;
321            case NATIVE_WINDOW_QUEUES_TO_WINDOW_COMPOSER: {
322                sp<ISurfaceComposer> composer(
323                        ComposerService::getComposerService());
324                if (composer->authenticateSurfaceTexture(mGraphicBufferProducer)) {
325                    *value = 1;
326                } else {
327                    *value = 0;
328                }
329                return NO_ERROR;
330            }
331            case NATIVE_WINDOW_CONCRETE_TYPE:
332                *value = NATIVE_WINDOW_SURFACE;
333                return NO_ERROR;
334            case NATIVE_WINDOW_DEFAULT_WIDTH:
335                *value = mUserWidth ? mUserWidth : mDefaultWidth;
336                return NO_ERROR;
337            case NATIVE_WINDOW_DEFAULT_HEIGHT:
338                *value = mUserHeight ? mUserHeight : mDefaultHeight;
339                return NO_ERROR;
340            case NATIVE_WINDOW_TRANSFORM_HINT:
341                *value = mTransformHint;
342                return NO_ERROR;
343            case NATIVE_WINDOW_CONSUMER_RUNNING_BEHIND: {
344                status_t err = NO_ERROR;
345                if (!mConsumerRunningBehind) {
346                    *value = 0;
347                } else {
348                    err = mGraphicBufferProducer->query(what, value);
349                    if (err == NO_ERROR) {
350                        mConsumerRunningBehind = *value;
351                    }
352                }
353                return err;
354            }
355        }
356    }
357    return mGraphicBufferProducer->query(what, value);
358}
359
360int Surface::perform(int operation, va_list args)
361{
362    int res = NO_ERROR;
363    switch (operation) {
364    case NATIVE_WINDOW_CONNECT:
365        // deprecated. must return NO_ERROR.
366        break;
367    case NATIVE_WINDOW_DISCONNECT:
368        // deprecated. must return NO_ERROR.
369        break;
370    case NATIVE_WINDOW_SET_USAGE:
371        res = dispatchSetUsage(args);
372        break;
373    case NATIVE_WINDOW_SET_CROP:
374        res = dispatchSetCrop(args);
375        break;
376    case NATIVE_WINDOW_SET_BUFFER_COUNT:
377        res = dispatchSetBufferCount(args);
378        break;
379    case NATIVE_WINDOW_SET_BUFFERS_GEOMETRY:
380        res = dispatchSetBuffersGeometry(args);
381        break;
382    case NATIVE_WINDOW_SET_BUFFERS_TRANSFORM:
383        res = dispatchSetBuffersTransform(args);
384        break;
385    case NATIVE_WINDOW_SET_BUFFERS_TIMESTAMP:
386        res = dispatchSetBuffersTimestamp(args);
387        break;
388    case NATIVE_WINDOW_SET_BUFFERS_DIMENSIONS:
389        res = dispatchSetBuffersDimensions(args);
390        break;
391    case NATIVE_WINDOW_SET_BUFFERS_USER_DIMENSIONS:
392        res = dispatchSetBuffersUserDimensions(args);
393        break;
394    case NATIVE_WINDOW_SET_BUFFERS_FORMAT:
395        res = dispatchSetBuffersFormat(args);
396        break;
397    case NATIVE_WINDOW_LOCK:
398        res = dispatchLock(args);
399        break;
400    case NATIVE_WINDOW_UNLOCK_AND_POST:
401        res = dispatchUnlockAndPost(args);
402        break;
403    case NATIVE_WINDOW_SET_SCALING_MODE:
404        res = dispatchSetScalingMode(args);
405        break;
406    case NATIVE_WINDOW_API_CONNECT:
407        res = dispatchConnect(args);
408        break;
409    case NATIVE_WINDOW_API_DISCONNECT:
410        res = dispatchDisconnect(args);
411        break;
412    default:
413        res = NAME_NOT_FOUND;
414        break;
415    }
416    return res;
417}
418
419int Surface::dispatchConnect(va_list args) {
420    int api = va_arg(args, int);
421    return connect(api);
422}
423
424int Surface::dispatchDisconnect(va_list args) {
425    int api = va_arg(args, int);
426    return disconnect(api);
427}
428
429int Surface::dispatchSetUsage(va_list args) {
430    int usage = va_arg(args, int);
431    return setUsage(usage);
432}
433
434int Surface::dispatchSetCrop(va_list args) {
435    android_native_rect_t const* rect = va_arg(args, android_native_rect_t*);
436    return setCrop(reinterpret_cast<Rect const*>(rect));
437}
438
439int Surface::dispatchSetBufferCount(va_list args) {
440    size_t bufferCount = va_arg(args, size_t);
441    return setBufferCount(bufferCount);
442}
443
444int Surface::dispatchSetBuffersGeometry(va_list args) {
445    int w = va_arg(args, int);
446    int h = va_arg(args, int);
447    int f = va_arg(args, int);
448    int err = setBuffersDimensions(w, h);
449    if (err != 0) {
450        return err;
451    }
452    return setBuffersFormat(f);
453}
454
455int Surface::dispatchSetBuffersDimensions(va_list args) {
456    int w = va_arg(args, int);
457    int h = va_arg(args, int);
458    return setBuffersDimensions(w, h);
459}
460
461int Surface::dispatchSetBuffersUserDimensions(va_list args) {
462    int w = va_arg(args, int);
463    int h = va_arg(args, int);
464    return setBuffersUserDimensions(w, h);
465}
466
467int Surface::dispatchSetBuffersFormat(va_list args) {
468    int f = va_arg(args, int);
469    return setBuffersFormat(f);
470}
471
472int Surface::dispatchSetScalingMode(va_list args) {
473    int m = va_arg(args, int);
474    return setScalingMode(m);
475}
476
477int Surface::dispatchSetBuffersTransform(va_list args) {
478    int transform = va_arg(args, int);
479    return setBuffersTransform(transform);
480}
481
482int Surface::dispatchSetBuffersTimestamp(va_list args) {
483    int64_t timestamp = va_arg(args, int64_t);
484    return setBuffersTimestamp(timestamp);
485}
486
487int Surface::dispatchLock(va_list args) {
488    ANativeWindow_Buffer* outBuffer = va_arg(args, ANativeWindow_Buffer*);
489    ARect* inOutDirtyBounds = va_arg(args, ARect*);
490    return lock(outBuffer, inOutDirtyBounds);
491}
492
493int Surface::dispatchUnlockAndPost(va_list args) {
494    return unlockAndPost();
495}
496
497
498int Surface::connect(int api) {
499    ATRACE_CALL();
500    ALOGV("Surface::connect");
501    Mutex::Autolock lock(mMutex);
502    IGraphicBufferProducer::QueueBufferOutput output;
503    int err = mGraphicBufferProducer->connect(api, &output);
504    if (err == NO_ERROR) {
505        uint32_t numPendingBuffers = 0;
506        output.deflate(&mDefaultWidth, &mDefaultHeight, &mTransformHint,
507                &numPendingBuffers);
508        mConsumerRunningBehind = (numPendingBuffers >= 2);
509    }
510    if (!err && api == NATIVE_WINDOW_API_CPU) {
511        mConnectedToCpu = true;
512    }
513    return err;
514}
515
516int Surface::disconnect(int api) {
517    ATRACE_CALL();
518    ALOGV("Surface::disconnect");
519    Mutex::Autolock lock(mMutex);
520    freeAllBuffers();
521    int err = mGraphicBufferProducer->disconnect(api);
522    if (!err) {
523        mReqFormat = 0;
524        mReqWidth = 0;
525        mReqHeight = 0;
526        mReqUsage = 0;
527        mCrop.clear();
528        mScalingMode = NATIVE_WINDOW_SCALING_MODE_FREEZE;
529        mTransform = 0;
530        if (api == NATIVE_WINDOW_API_CPU) {
531            mConnectedToCpu = false;
532        }
533    }
534    return err;
535}
536
537int Surface::setUsage(uint32_t reqUsage)
538{
539    ALOGV("Surface::setUsage");
540    Mutex::Autolock lock(mMutex);
541    mReqUsage = reqUsage;
542    return OK;
543}
544
545int Surface::setCrop(Rect const* rect)
546{
547    ATRACE_CALL();
548
549    Rect realRect;
550    if (rect == NULL || rect->isEmpty()) {
551        realRect.clear();
552    } else {
553        realRect = *rect;
554    }
555
556    ALOGV("Surface::setCrop rect=[%d %d %d %d]",
557            realRect.left, realRect.top, realRect.right, realRect.bottom);
558
559    Mutex::Autolock lock(mMutex);
560    mCrop = realRect;
561    return NO_ERROR;
562}
563
564int Surface::setBufferCount(int bufferCount)
565{
566    ATRACE_CALL();
567    ALOGV("Surface::setBufferCount");
568    Mutex::Autolock lock(mMutex);
569
570    status_t err = mGraphicBufferProducer->setBufferCount(bufferCount);
571    ALOGE_IF(err, "IGraphicBufferProducer::setBufferCount(%d) returned %s",
572            bufferCount, strerror(-err));
573
574    if (err == NO_ERROR) {
575        freeAllBuffers();
576    }
577
578    return err;
579}
580
581int Surface::setBuffersDimensions(int w, int h)
582{
583    ATRACE_CALL();
584    ALOGV("Surface::setBuffersDimensions");
585
586    if (w<0 || h<0)
587        return BAD_VALUE;
588
589    if ((w && !h) || (!w && h))
590        return BAD_VALUE;
591
592    Mutex::Autolock lock(mMutex);
593    mReqWidth = w;
594    mReqHeight = h;
595    return NO_ERROR;
596}
597
598int Surface::setBuffersUserDimensions(int w, int h)
599{
600    ATRACE_CALL();
601    ALOGV("Surface::setBuffersUserDimensions");
602
603    if (w<0 || h<0)
604        return BAD_VALUE;
605
606    if ((w && !h) || (!w && h))
607        return BAD_VALUE;
608
609    Mutex::Autolock lock(mMutex);
610    mUserWidth = w;
611    mUserHeight = h;
612    return NO_ERROR;
613}
614
615int Surface::setBuffersFormat(int format)
616{
617    ALOGV("Surface::setBuffersFormat");
618
619    if (format<0)
620        return BAD_VALUE;
621
622    Mutex::Autolock lock(mMutex);
623    mReqFormat = format;
624    return NO_ERROR;
625}
626
627int Surface::setScalingMode(int mode)
628{
629    ATRACE_CALL();
630    ALOGV("Surface::setScalingMode(%d)", mode);
631
632    switch (mode) {
633        case NATIVE_WINDOW_SCALING_MODE_FREEZE:
634        case NATIVE_WINDOW_SCALING_MODE_SCALE_TO_WINDOW:
635        case NATIVE_WINDOW_SCALING_MODE_SCALE_CROP:
636            break;
637        default:
638            ALOGE("unknown scaling mode: %d", mode);
639            return BAD_VALUE;
640    }
641
642    Mutex::Autolock lock(mMutex);
643    mScalingMode = mode;
644    return NO_ERROR;
645}
646
647int Surface::setBuffersTransform(int transform)
648{
649    ATRACE_CALL();
650    ALOGV("Surface::setBuffersTransform");
651    Mutex::Autolock lock(mMutex);
652    mTransform = transform;
653    return NO_ERROR;
654}
655
656int Surface::setBuffersTimestamp(int64_t timestamp)
657{
658    ALOGV("Surface::setBuffersTimestamp");
659    Mutex::Autolock lock(mMutex);
660    mTimestamp = timestamp;
661    return NO_ERROR;
662}
663
664void Surface::freeAllBuffers() {
665    for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
666        mSlots[i].buffer = 0;
667    }
668}
669
670// ----------------------------------------------------------------------
671// the lock/unlock APIs must be used from the same thread
672
673static status_t copyBlt(
674        const sp<GraphicBuffer>& dst,
675        const sp<GraphicBuffer>& src,
676        const Region& reg)
677{
678    // src and dst with, height and format must be identical. no verification
679    // is done here.
680    status_t err;
681    uint8_t const * src_bits = NULL;
682    err = src->lock(GRALLOC_USAGE_SW_READ_OFTEN, reg.bounds(), (void**)&src_bits);
683    ALOGE_IF(err, "error locking src buffer %s", strerror(-err));
684
685    uint8_t* dst_bits = NULL;
686    err = dst->lock(GRALLOC_USAGE_SW_WRITE_OFTEN, reg.bounds(), (void**)&dst_bits);
687    ALOGE_IF(err, "error locking dst buffer %s", strerror(-err));
688
689    Region::const_iterator head(reg.begin());
690    Region::const_iterator tail(reg.end());
691    if (head != tail && src_bits && dst_bits) {
692        const size_t bpp = bytesPerPixel(src->format);
693        const size_t dbpr = dst->stride * bpp;
694        const size_t sbpr = src->stride * bpp;
695
696        while (head != tail) {
697            const Rect& r(*head++);
698            ssize_t h = r.height();
699            if (h <= 0) continue;
700            size_t size = r.width() * bpp;
701            uint8_t const * s = src_bits + (r.left + src->stride * r.top) * bpp;
702            uint8_t       * d = dst_bits + (r.left + dst->stride * r.top) * bpp;
703            if (dbpr==sbpr && size==sbpr) {
704                size *= h;
705                h = 1;
706            }
707            do {
708                memcpy(d, s, size);
709                d += dbpr;
710                s += sbpr;
711            } while (--h > 0);
712        }
713    }
714
715    if (src_bits)
716        src->unlock();
717
718    if (dst_bits)
719        dst->unlock();
720
721    return err;
722}
723
724// ----------------------------------------------------------------------------
725
726status_t Surface::writeToParcel(
727        const sp<Surface>& surface, Parcel* parcel) {
728    sp<IGraphicBufferProducer> bp;
729    if (surface != NULL) {
730        bp = surface->mGraphicBufferProducer;
731    }
732    return parcel->writeStrongBinder(bp->asBinder());
733}
734
735sp<Surface> Surface::readFromParcel(const Parcel& data) {
736    sp<IBinder> binder(data.readStrongBinder());
737    sp<IGraphicBufferProducer> bp(interface_cast<IGraphicBufferProducer>(binder));
738    return bp != NULL ? new Surface(bp): NULL;
739}
740
741// ----------------------------------------------------------------------------
742
743status_t Surface::lock(
744        ANativeWindow_Buffer* outBuffer, ARect* inOutDirtyBounds)
745{
746    if (mLockedBuffer != 0) {
747        ALOGE("Surface::lock failed, already locked");
748        return INVALID_OPERATION;
749    }
750
751    if (!mConnectedToCpu) {
752        int err = Surface::connect(NATIVE_WINDOW_API_CPU);
753        if (err) {
754            return err;
755        }
756        // we're intending to do software rendering from this point
757        setUsage(GRALLOC_USAGE_SW_READ_OFTEN | GRALLOC_USAGE_SW_WRITE_OFTEN);
758    }
759
760    ANativeWindowBuffer* out;
761    int fenceFd = -1;
762    status_t err = dequeueBuffer(&out, &fenceFd);
763    ALOGE_IF(err, "dequeueBuffer failed (%s)", strerror(-err));
764    if (err == NO_ERROR) {
765        sp<GraphicBuffer> backBuffer(GraphicBuffer::getSelf(out));
766        sp<Fence> fence(new Fence(fenceFd));
767
768        err = fence->waitForever(1000, "Surface::lock");
769        if (err != OK) {
770            ALOGE("Fence::wait failed (%s)", strerror(-err));
771            cancelBuffer(out, fenceFd);
772            return err;
773        }
774
775        const Rect bounds(backBuffer->width, backBuffer->height);
776
777        Region newDirtyRegion;
778        if (inOutDirtyBounds) {
779            newDirtyRegion.set(static_cast<Rect const&>(*inOutDirtyBounds));
780            newDirtyRegion.andSelf(bounds);
781        } else {
782            newDirtyRegion.set(bounds);
783        }
784
785        // figure out if we can copy the frontbuffer back
786        const sp<GraphicBuffer>& frontBuffer(mPostedBuffer);
787        const bool canCopyBack = (frontBuffer != 0 &&
788                backBuffer->width  == frontBuffer->width &&
789                backBuffer->height == frontBuffer->height &&
790                backBuffer->format == frontBuffer->format);
791
792        if (canCopyBack) {
793            // copy the area that is invalid and not repainted this round
794            const Region copyback(mDirtyRegion.subtract(newDirtyRegion));
795            if (!copyback.isEmpty())
796                copyBlt(backBuffer, frontBuffer, copyback);
797        } else {
798            // if we can't copy-back anything, modify the user's dirty
799            // region to make sure they redraw the whole buffer
800            newDirtyRegion.set(bounds);
801            mDirtyRegion.clear();
802            Mutex::Autolock lock(mMutex);
803            for (size_t i=0 ; i<NUM_BUFFER_SLOTS ; i++) {
804                mSlots[i].dirtyRegion.clear();
805            }
806        }
807
808
809        { // scope for the lock
810            Mutex::Autolock lock(mMutex);
811            int backBufferSlot(getSlotFromBufferLocked(backBuffer.get()));
812            if (backBufferSlot >= 0) {
813                Region& dirtyRegion(mSlots[backBufferSlot].dirtyRegion);
814                mDirtyRegion.subtract(dirtyRegion);
815                dirtyRegion = newDirtyRegion;
816            }
817        }
818
819        mDirtyRegion.orSelf(newDirtyRegion);
820        if (inOutDirtyBounds) {
821            *inOutDirtyBounds = newDirtyRegion.getBounds();
822        }
823
824        void* vaddr;
825        status_t res = backBuffer->lock(
826                GRALLOC_USAGE_SW_READ_OFTEN | GRALLOC_USAGE_SW_WRITE_OFTEN,
827                newDirtyRegion.bounds(), &vaddr);
828
829        ALOGW_IF(res, "failed locking buffer (handle = %p)",
830                backBuffer->handle);
831
832        if (res != 0) {
833            err = INVALID_OPERATION;
834        } else {
835            mLockedBuffer = backBuffer;
836            outBuffer->width  = backBuffer->width;
837            outBuffer->height = backBuffer->height;
838            outBuffer->stride = backBuffer->stride;
839            outBuffer->format = backBuffer->format;
840            outBuffer->bits   = vaddr;
841        }
842    }
843    return err;
844}
845
846status_t Surface::unlockAndPost()
847{
848    if (mLockedBuffer == 0) {
849        ALOGE("Surface::unlockAndPost failed, no locked buffer");
850        return INVALID_OPERATION;
851    }
852
853    status_t err = mLockedBuffer->unlock();
854    ALOGE_IF(err, "failed unlocking buffer (%p)", mLockedBuffer->handle);
855
856    err = queueBuffer(mLockedBuffer.get(), -1);
857    ALOGE_IF(err, "queueBuffer (handle=%p) failed (%s)",
858            mLockedBuffer->handle, strerror(-err));
859
860    mPostedBuffer = mLockedBuffer;
861    mLockedBuffer = 0;
862    return err;
863}
864
865}; // namespace android
866