Surface.cpp revision 53ec72523a4083b88eaa13e2e720976523a7ebf8 
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        bool controlledByApp)
42    : mGraphicBufferProducer(bufferProducer)
43{
44    // Initialize the ANativeWindow function pointers.
45    ANativeWindow::setSwapInterval  = hook_setSwapInterval;
46    ANativeWindow::dequeueBuffer    = hook_dequeueBuffer;
47    ANativeWindow::cancelBuffer     = hook_cancelBuffer;
48    ANativeWindow::queueBuffer      = hook_queueBuffer;
49    ANativeWindow::query            = hook_query;
50    ANativeWindow::perform          = hook_perform;
51
52    ANativeWindow::dequeueBuffer_DEPRECATED = hook_dequeueBuffer_DEPRECATED;
53    ANativeWindow::cancelBuffer_DEPRECATED  = hook_cancelBuffer_DEPRECATED;
54    ANativeWindow::lockBuffer_DEPRECATED    = hook_lockBuffer_DEPRECATED;
55    ANativeWindow::queueBuffer_DEPRECATED   = hook_queueBuffer_DEPRECATED;
56
57    const_cast<int&>(ANativeWindow::minSwapInterval) = 0;
58    const_cast<int&>(ANativeWindow::maxSwapInterval) = 1;
59
60    mReqWidth = 0;
61    mReqHeight = 0;
62    mReqFormat = 0;
63    mReqUsage = 0;
64    mTimestamp = NATIVE_WINDOW_TIMESTAMP_AUTO;
65    mCrop.clear();
66    mScalingMode = NATIVE_WINDOW_SCALING_MODE_FREEZE;
67    mTransform = 0;
68    mDefaultWidth = 0;
69    mDefaultHeight = 0;
70    mUserWidth = 0;
71    mUserHeight = 0;
72    mTransformHint = 0;
73    mConsumerRunningBehind = false;
74    mConnectedToCpu = false;
75    mProducerControlledByApp = controlledByApp;
76    mSwapIntervalZero = false;
77}
78
79Surface::~Surface() {
80    if (mConnectedToCpu) {
81        Surface::disconnect(NATIVE_WINDOW_API_CPU);
82    }
83}
84
85sp<IGraphicBufferProducer> Surface::getIGraphicBufferProducer() const {
86    return mGraphicBufferProducer;
87}
88
89int Surface::hook_setSwapInterval(ANativeWindow* window, int interval) {
90    Surface* c = getSelf(window);
91    return c->setSwapInterval(interval);
92}
93
94int Surface::hook_dequeueBuffer(ANativeWindow* window,
95        ANativeWindowBuffer** buffer, int* fenceFd) {
96    Surface* c = getSelf(window);
97    return c->dequeueBuffer(buffer, fenceFd);
98}
99
100int Surface::hook_cancelBuffer(ANativeWindow* window,
101        ANativeWindowBuffer* buffer, int fenceFd) {
102    Surface* c = getSelf(window);
103    return c->cancelBuffer(buffer, fenceFd);
104}
105
106int Surface::hook_queueBuffer(ANativeWindow* window,
107        ANativeWindowBuffer* buffer, int fenceFd) {
108    Surface* c = getSelf(window);
109    return c->queueBuffer(buffer, fenceFd);
110}
111
112int Surface::hook_dequeueBuffer_DEPRECATED(ANativeWindow* window,
113        ANativeWindowBuffer** buffer) {
114    Surface* c = getSelf(window);
115    ANativeWindowBuffer* buf;
116    int fenceFd = -1;
117    int result = c->dequeueBuffer(&buf, &fenceFd);
118    sp<Fence> fence(new Fence(fenceFd));
119    int waitResult = fence->waitForever("dequeueBuffer_DEPRECATED");
120    if (waitResult != OK) {
121        ALOGE("dequeueBuffer_DEPRECATED: Fence::wait returned an error: %d",
122                waitResult);
123        c->cancelBuffer(buf, -1);
124        return waitResult;
125    }
126    *buffer = buf;
127    return result;
128}
129
130int Surface::hook_cancelBuffer_DEPRECATED(ANativeWindow* window,
131        ANativeWindowBuffer* buffer) {
132    Surface* c = getSelf(window);
133    return c->cancelBuffer(buffer, -1);
134}
135
136int Surface::hook_lockBuffer_DEPRECATED(ANativeWindow* window,
137        ANativeWindowBuffer* buffer) {
138    Surface* c = getSelf(window);
139    return c->lockBuffer_DEPRECATED(buffer);
140}
141
142int Surface::hook_queueBuffer_DEPRECATED(ANativeWindow* window,
143        ANativeWindowBuffer* buffer) {
144    Surface* c = getSelf(window);
145    return c->queueBuffer(buffer, -1);
146}
147
148int Surface::hook_query(const ANativeWindow* window,
149                                int what, int* value) {
150    const Surface* c = getSelf(window);
151    return c->query(what, value);
152}
153
154int Surface::hook_perform(ANativeWindow* window, int operation, ...) {
155    va_list args;
156    va_start(args, operation);
157    Surface* c = getSelf(window);
158    return c->perform(operation, args);
159}
160
161int Surface::setSwapInterval(int interval) {
162    ATRACE_CALL();
163    // EGL specification states:
164    //  interval is silently clamped to minimum and maximum implementation
165    //  dependent values before being stored.
166
167    if (interval < minSwapInterval)
168        interval = minSwapInterval;
169
170    if (interval > maxSwapInterval)
171        interval = maxSwapInterval;
172
173    mSwapIntervalZero = (interval == 0);
174
175    return NO_ERROR;
176}
177
178int Surface::dequeueBuffer(android_native_buffer_t** buffer, int* fenceFd) {
179    ATRACE_CALL();
180    ALOGV("Surface::dequeueBuffer");
181    Mutex::Autolock lock(mMutex);
182    int buf = -1;
183    int reqW = mReqWidth ? mReqWidth : mUserWidth;
184    int reqH = mReqHeight ? mReqHeight : mUserHeight;
185    sp<Fence> fence;
186    status_t result = mGraphicBufferProducer->dequeueBuffer(&buf, &fence, mSwapIntervalZero,
187            reqW, reqH, mReqFormat, mReqUsage);
188    if (result < 0) {
189        ALOGV("dequeueBuffer: IGraphicBufferProducer::dequeueBuffer(%d, %d, %d, %d)"
190             "failed: %d", mReqWidth, mReqHeight, mReqFormat, mReqUsage,
191             result);
192        return result;
193    }
194    sp<GraphicBuffer>& gbuf(mSlots[buf].buffer);
195
196    // this should never happen
197    ALOGE_IF(fence == NULL, "Surface::dequeueBuffer: received null Fence! buf=%d", buf);
198
199    if (result & IGraphicBufferProducer::RELEASE_ALL_BUFFERS) {
200        freeAllBuffers();
201    }
202
203    if ((result & IGraphicBufferProducer::BUFFER_NEEDS_REALLOCATION) || gbuf == 0) {
204        result = mGraphicBufferProducer->requestBuffer(buf, &gbuf);
205        if (result != NO_ERROR) {
206            ALOGE("dequeueBuffer: IGraphicBufferProducer::requestBuffer failed: %d", result);
207            return result;
208        }
209    }
210
211    if (fence->isValid()) {
212        *fenceFd = fence->dup();
213        if (*fenceFd == -1) {
214            ALOGE("dequeueBuffer: error duping fence: %d", errno);
215            // dup() should never fail; something is badly wrong. Soldier on
216            // and hope for the best; the worst that should happen is some
217            // visible corruption that lasts until the next frame.
218        }
219    } else {
220        *fenceFd = -1;
221    }
222
223    *buffer = gbuf.get();
224    return OK;
225}
226
227int Surface::cancelBuffer(android_native_buffer_t* buffer,
228        int fenceFd) {
229    ATRACE_CALL();
230    ALOGV("Surface::cancelBuffer");
231    Mutex::Autolock lock(mMutex);
232    int i = getSlotFromBufferLocked(buffer);
233    if (i < 0) {
234        return i;
235    }
236    sp<Fence> fence(fenceFd >= 0 ? new Fence(fenceFd) : Fence::NO_FENCE);
237    mGraphicBufferProducer->cancelBuffer(i, fence);
238    return OK;
239}
240
241int Surface::getSlotFromBufferLocked(
242        android_native_buffer_t* buffer) const {
243    bool dumpedState = false;
244    for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
245        if (mSlots[i].buffer != NULL &&
246                mSlots[i].buffer->handle == buffer->handle) {
247            return i;
248        }
249    }
250    ALOGE("getSlotFromBufferLocked: unknown buffer: %p", buffer->handle);
251    return BAD_VALUE;
252}
253
254int Surface::lockBuffer_DEPRECATED(android_native_buffer_t* buffer) {
255    ALOGV("Surface::lockBuffer");
256    Mutex::Autolock lock(mMutex);
257    return OK;
258}
259
260int Surface::queueBuffer(android_native_buffer_t* buffer, int fenceFd) {
261    ATRACE_CALL();
262    ALOGV("Surface::queueBuffer");
263    Mutex::Autolock lock(mMutex);
264    int64_t timestamp;
265    bool isAutoTimestamp = false;
266    if (mTimestamp == NATIVE_WINDOW_TIMESTAMP_AUTO) {
267        timestamp = systemTime(SYSTEM_TIME_MONOTONIC);
268        isAutoTimestamp = true;
269        ALOGV("Surface::queueBuffer making up timestamp: %.2f ms",
270            timestamp / 1000000.f);
271    } else {
272        timestamp = mTimestamp;
273    }
274    int i = getSlotFromBufferLocked(buffer);
275    if (i < 0) {
276        return i;
277    }
278
279
280    // Make sure the crop rectangle is entirely inside the buffer.
281    Rect crop;
282    mCrop.intersect(Rect(buffer->width, buffer->height), &crop);
283
284    sp<Fence> fence(fenceFd >= 0 ? new Fence(fenceFd) : Fence::NO_FENCE);
285    IGraphicBufferProducer::QueueBufferOutput output;
286    IGraphicBufferProducer::QueueBufferInput input(timestamp, isAutoTimestamp,
287            crop, mScalingMode, mTransform, mSwapIntervalZero, fence);
288    status_t err = mGraphicBufferProducer->queueBuffer(i, input, &output);
289    if (err != OK)  {
290        ALOGE("queueBuffer: error queuing buffer to SurfaceTexture, %d", err);
291    }
292    uint32_t numPendingBuffers = 0;
293    output.deflate(&mDefaultWidth, &mDefaultHeight, &mTransformHint,
294            &numPendingBuffers);
295
296    mConsumerRunningBehind = (numPendingBuffers >= 2);
297
298    return err;
299}
300
301int Surface::query(int what, int* value) const {
302    ATRACE_CALL();
303    ALOGV("Surface::query");
304    { // scope for the lock
305        Mutex::Autolock lock(mMutex);
306        switch (what) {
307            case NATIVE_WINDOW_FORMAT:
308                if (mReqFormat) {
309                    *value = mReqFormat;
310                    return NO_ERROR;
311                }
312                break;
313            case NATIVE_WINDOW_QUEUES_TO_WINDOW_COMPOSER: {
314                sp<ISurfaceComposer> composer(
315                        ComposerService::getComposerService());
316                if (composer->authenticateSurfaceTexture(mGraphicBufferProducer)) {
317                    *value = 1;
318                } else {
319                    *value = 0;
320                }
321                return NO_ERROR;
322            }
323            case NATIVE_WINDOW_CONCRETE_TYPE:
324                *value = NATIVE_WINDOW_SURFACE;
325                return NO_ERROR;
326            case NATIVE_WINDOW_DEFAULT_WIDTH:
327                *value = mUserWidth ? mUserWidth : mDefaultWidth;
328                return NO_ERROR;
329            case NATIVE_WINDOW_DEFAULT_HEIGHT:
330                *value = mUserHeight ? mUserHeight : mDefaultHeight;
331                return NO_ERROR;
332            case NATIVE_WINDOW_TRANSFORM_HINT:
333                *value = mTransformHint;
334                return NO_ERROR;
335            case NATIVE_WINDOW_CONSUMER_RUNNING_BEHIND: {
336                status_t err = NO_ERROR;
337                if (!mConsumerRunningBehind) {
338                    *value = 0;
339                } else {
340                    err = mGraphicBufferProducer->query(what, value);
341                    if (err == NO_ERROR) {
342                        mConsumerRunningBehind = *value;
343                    }
344                }
345                return err;
346            }
347        }
348    }
349    return mGraphicBufferProducer->query(what, value);
350}
351
352int Surface::perform(int operation, va_list args)
353{
354    int res = NO_ERROR;
355    switch (operation) {
356    case NATIVE_WINDOW_CONNECT:
357        // deprecated. must return NO_ERROR.
358        break;
359    case NATIVE_WINDOW_DISCONNECT:
360        // deprecated. must return NO_ERROR.
361        break;
362    case NATIVE_WINDOW_SET_USAGE:
363        res = dispatchSetUsage(args);
364        break;
365    case NATIVE_WINDOW_SET_CROP:
366        res = dispatchSetCrop(args);
367        break;
368    case NATIVE_WINDOW_SET_BUFFER_COUNT:
369        res = dispatchSetBufferCount(args);
370        break;
371    case NATIVE_WINDOW_SET_BUFFERS_GEOMETRY:
372        res = dispatchSetBuffersGeometry(args);
373        break;
374    case NATIVE_WINDOW_SET_BUFFERS_TRANSFORM:
375        res = dispatchSetBuffersTransform(args);
376        break;
377    case NATIVE_WINDOW_SET_BUFFERS_TIMESTAMP:
378        res = dispatchSetBuffersTimestamp(args);
379        break;
380    case NATIVE_WINDOW_SET_BUFFERS_DIMENSIONS:
381        res = dispatchSetBuffersDimensions(args);
382        break;
383    case NATIVE_WINDOW_SET_BUFFERS_USER_DIMENSIONS:
384        res = dispatchSetBuffersUserDimensions(args);
385        break;
386    case NATIVE_WINDOW_SET_BUFFERS_FORMAT:
387        res = dispatchSetBuffersFormat(args);
388        break;
389    case NATIVE_WINDOW_LOCK:
390        res = dispatchLock(args);
391        break;
392    case NATIVE_WINDOW_UNLOCK_AND_POST:
393        res = dispatchUnlockAndPost(args);
394        break;
395    case NATIVE_WINDOW_SET_SCALING_MODE:
396        res = dispatchSetScalingMode(args);
397        break;
398    case NATIVE_WINDOW_API_CONNECT:
399        res = dispatchConnect(args);
400        break;
401    case NATIVE_WINDOW_API_DISCONNECT:
402        res = dispatchDisconnect(args);
403        break;
404    default:
405        res = NAME_NOT_FOUND;
406        break;
407    }
408    return res;
409}
410
411int Surface::dispatchConnect(va_list args) {
412    int api = va_arg(args, int);
413    return connect(api);
414}
415
416int Surface::dispatchDisconnect(va_list args) {
417    int api = va_arg(args, int);
418    return disconnect(api);
419}
420
421int Surface::dispatchSetUsage(va_list args) {
422    int usage = va_arg(args, int);
423    return setUsage(usage);
424}
425
426int Surface::dispatchSetCrop(va_list args) {
427    android_native_rect_t const* rect = va_arg(args, android_native_rect_t*);
428    return setCrop(reinterpret_cast<Rect const*>(rect));
429}
430
431int Surface::dispatchSetBufferCount(va_list args) {
432    size_t bufferCount = va_arg(args, size_t);
433    return setBufferCount(bufferCount);
434}
435
436int Surface::dispatchSetBuffersGeometry(va_list args) {
437    int w = va_arg(args, int);
438    int h = va_arg(args, int);
439    int f = va_arg(args, int);
440    int err = setBuffersDimensions(w, h);
441    if (err != 0) {
442        return err;
443    }
444    return setBuffersFormat(f);
445}
446
447int Surface::dispatchSetBuffersDimensions(va_list args) {
448    int w = va_arg(args, int);
449    int h = va_arg(args, int);
450    return setBuffersDimensions(w, h);
451}
452
453int Surface::dispatchSetBuffersUserDimensions(va_list args) {
454    int w = va_arg(args, int);
455    int h = va_arg(args, int);
456    return setBuffersUserDimensions(w, h);
457}
458
459int Surface::dispatchSetBuffersFormat(va_list args) {
460    int f = va_arg(args, int);
461    return setBuffersFormat(f);
462}
463
464int Surface::dispatchSetScalingMode(va_list args) {
465    int m = va_arg(args, int);
466    return setScalingMode(m);
467}
468
469int Surface::dispatchSetBuffersTransform(va_list args) {
470    int transform = va_arg(args, int);
471    return setBuffersTransform(transform);
472}
473
474int Surface::dispatchSetBuffersTimestamp(va_list args) {
475    int64_t timestamp = va_arg(args, int64_t);
476    return setBuffersTimestamp(timestamp);
477}
478
479int Surface::dispatchLock(va_list args) {
480    ANativeWindow_Buffer* outBuffer = va_arg(args, ANativeWindow_Buffer*);
481    ARect* inOutDirtyBounds = va_arg(args, ARect*);
482    return lock(outBuffer, inOutDirtyBounds);
483}
484
485int Surface::dispatchUnlockAndPost(va_list args) {
486    return unlockAndPost();
487}
488
489
490int Surface::connect(int api) {
491    ATRACE_CALL();
492    ALOGV("Surface::connect");
493    static sp<BBinder> sLife = new BBinder();
494    Mutex::Autolock lock(mMutex);
495    IGraphicBufferProducer::QueueBufferOutput output;
496    int err = mGraphicBufferProducer->connect(sLife, api, mProducerControlledByApp, &output);
497    if (err == NO_ERROR) {
498        uint32_t numPendingBuffers = 0;
499        output.deflate(&mDefaultWidth, &mDefaultHeight, &mTransformHint,
500                &numPendingBuffers);
501        mConsumerRunningBehind = (numPendingBuffers >= 2);
502    }
503    if (!err && api == NATIVE_WINDOW_API_CPU) {
504        mConnectedToCpu = true;
505    }
506    return err;
507}
508
509
510int Surface::disconnect(int api) {
511    ATRACE_CALL();
512    ALOGV("Surface::disconnect");
513    Mutex::Autolock lock(mMutex);
514    freeAllBuffers();
515    int err = mGraphicBufferProducer->disconnect(api);
516    if (!err) {
517        mReqFormat = 0;
518        mReqWidth = 0;
519        mReqHeight = 0;
520        mReqUsage = 0;
521        mCrop.clear();
522        mScalingMode = NATIVE_WINDOW_SCALING_MODE_FREEZE;
523        mTransform = 0;
524        if (api == NATIVE_WINDOW_API_CPU) {
525            mConnectedToCpu = false;
526        }
527    }
528    return err;
529}
530
531int Surface::setUsage(uint32_t reqUsage)
532{
533    ALOGV("Surface::setUsage");
534    Mutex::Autolock lock(mMutex);
535    mReqUsage = reqUsage;
536    return OK;
537}
538
539int Surface::setCrop(Rect const* rect)
540{
541    ATRACE_CALL();
542
543    Rect realRect;
544    if (rect == NULL || rect->isEmpty()) {
545        realRect.clear();
546    } else {
547        realRect = *rect;
548    }
549
550    ALOGV("Surface::setCrop rect=[%d %d %d %d]",
551            realRect.left, realRect.top, realRect.right, realRect.bottom);
552
553    Mutex::Autolock lock(mMutex);
554    mCrop = realRect;
555    return NO_ERROR;
556}
557
558int Surface::setBufferCount(int bufferCount)
559{
560    ATRACE_CALL();
561    ALOGV("Surface::setBufferCount");
562    Mutex::Autolock lock(mMutex);
563
564    status_t err = mGraphicBufferProducer->setBufferCount(bufferCount);
565    ALOGE_IF(err, "IGraphicBufferProducer::setBufferCount(%d) returned %s",
566            bufferCount, strerror(-err));
567
568    if (err == NO_ERROR) {
569        freeAllBuffers();
570    }
571
572    return err;
573}
574
575int Surface::setBuffersDimensions(int w, int h)
576{
577    ATRACE_CALL();
578    ALOGV("Surface::setBuffersDimensions");
579
580    if (w<0 || h<0)
581        return BAD_VALUE;
582
583    if ((w && !h) || (!w && h))
584        return BAD_VALUE;
585
586    Mutex::Autolock lock(mMutex);
587    mReqWidth = w;
588    mReqHeight = h;
589    return NO_ERROR;
590}
591
592int Surface::setBuffersUserDimensions(int w, int h)
593{
594    ATRACE_CALL();
595    ALOGV("Surface::setBuffersUserDimensions");
596
597    if (w<0 || h<0)
598        return BAD_VALUE;
599
600    if ((w && !h) || (!w && h))
601        return BAD_VALUE;
602
603    Mutex::Autolock lock(mMutex);
604    mUserWidth = w;
605    mUserHeight = h;
606    return NO_ERROR;
607}
608
609int Surface::setBuffersFormat(int format)
610{
611    ALOGV("Surface::setBuffersFormat");
612
613    if (format<0)
614        return BAD_VALUE;
615
616    Mutex::Autolock lock(mMutex);
617    mReqFormat = format;
618    return NO_ERROR;
619}
620
621int Surface::setScalingMode(int mode)
622{
623    ATRACE_CALL();
624    ALOGV("Surface::setScalingMode(%d)", mode);
625
626    switch (mode) {
627        case NATIVE_WINDOW_SCALING_MODE_FREEZE:
628        case NATIVE_WINDOW_SCALING_MODE_SCALE_TO_WINDOW:
629        case NATIVE_WINDOW_SCALING_MODE_SCALE_CROP:
630            break;
631        default:
632            ALOGE("unknown scaling mode: %d", mode);
633            return BAD_VALUE;
634    }
635
636    Mutex::Autolock lock(mMutex);
637    mScalingMode = mode;
638    return NO_ERROR;
639}
640
641int Surface::setBuffersTransform(int transform)
642{
643    ATRACE_CALL();
644    ALOGV("Surface::setBuffersTransform");
645    Mutex::Autolock lock(mMutex);
646    mTransform = transform;
647    return NO_ERROR;
648}
649
650int Surface::setBuffersTimestamp(int64_t timestamp)
651{
652    ALOGV("Surface::setBuffersTimestamp");
653    Mutex::Autolock lock(mMutex);
654    mTimestamp = timestamp;
655    return NO_ERROR;
656}
657
658void Surface::freeAllBuffers() {
659    for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
660        mSlots[i].buffer = 0;
661    }
662}
663
664// ----------------------------------------------------------------------
665// the lock/unlock APIs must be used from the same thread
666
667static status_t copyBlt(
668        const sp<GraphicBuffer>& dst,
669        const sp<GraphicBuffer>& src,
670        const Region& reg)
671{
672    // src and dst with, height and format must be identical. no verification
673    // is done here.
674    status_t err;
675    uint8_t const * src_bits = NULL;
676    err = src->lock(GRALLOC_USAGE_SW_READ_OFTEN, reg.bounds(), (void**)&src_bits);
677    ALOGE_IF(err, "error locking src buffer %s", strerror(-err));
678
679    uint8_t* dst_bits = NULL;
680    err = dst->lock(GRALLOC_USAGE_SW_WRITE_OFTEN, reg.bounds(), (void**)&dst_bits);
681    ALOGE_IF(err, "error locking dst buffer %s", strerror(-err));
682
683    Region::const_iterator head(reg.begin());
684    Region::const_iterator tail(reg.end());
685    if (head != tail && src_bits && dst_bits) {
686        const size_t bpp = bytesPerPixel(src->format);
687        const size_t dbpr = dst->stride * bpp;
688        const size_t sbpr = src->stride * bpp;
689
690        while (head != tail) {
691            const Rect& r(*head++);
692            ssize_t h = r.height();
693            if (h <= 0) continue;
694            size_t size = r.width() * bpp;
695            uint8_t const * s = src_bits + (r.left + src->stride * r.top) * bpp;
696            uint8_t       * d = dst_bits + (r.left + dst->stride * r.top) * bpp;
697            if (dbpr==sbpr && size==sbpr) {
698                size *= h;
699                h = 1;
700            }
701            do {
702                memcpy(d, s, size);
703                d += dbpr;
704                s += sbpr;
705            } while (--h > 0);
706        }
707    }
708
709    if (src_bits)
710        src->unlock();
711
712    if (dst_bits)
713        dst->unlock();
714
715    return err;
716}
717
718// ----------------------------------------------------------------------------
719
720status_t Surface::lock(
721        ANativeWindow_Buffer* outBuffer, ARect* inOutDirtyBounds)
722{
723    if (mLockedBuffer != 0) {
724        ALOGE("Surface::lock failed, already locked");
725        return INVALID_OPERATION;
726    }
727
728    if (!mConnectedToCpu) {
729        int err = Surface::connect(NATIVE_WINDOW_API_CPU);
730        if (err) {
731            return err;
732        }
733        // we're intending to do software rendering from this point
734        setUsage(GRALLOC_USAGE_SW_READ_OFTEN | GRALLOC_USAGE_SW_WRITE_OFTEN);
735    }
736
737    ANativeWindowBuffer* out;
738    int fenceFd = -1;
739    status_t err = dequeueBuffer(&out, &fenceFd);
740    ALOGE_IF(err, "dequeueBuffer failed (%s)", strerror(-err));
741    if (err == NO_ERROR) {
742        sp<GraphicBuffer> backBuffer(GraphicBuffer::getSelf(out));
743        sp<Fence> fence(new Fence(fenceFd));
744
745        err = fence->waitForever("Surface::lock");
746        if (err != OK) {
747            ALOGE("Fence::wait failed (%s)", strerror(-err));
748            cancelBuffer(out, fenceFd);
749            return err;
750        }
751
752        const Rect bounds(backBuffer->width, backBuffer->height);
753
754        Region newDirtyRegion;
755        if (inOutDirtyBounds) {
756            newDirtyRegion.set(static_cast<Rect const&>(*inOutDirtyBounds));
757            newDirtyRegion.andSelf(bounds);
758        } else {
759            newDirtyRegion.set(bounds);
760        }
761
762        // figure out if we can copy the frontbuffer back
763        const sp<GraphicBuffer>& frontBuffer(mPostedBuffer);
764        const bool canCopyBack = (frontBuffer != 0 &&
765                backBuffer->width  == frontBuffer->width &&
766                backBuffer->height == frontBuffer->height &&
767                backBuffer->format == frontBuffer->format);
768
769        if (canCopyBack) {
770            // copy the area that is invalid and not repainted this round
771            const Region copyback(mDirtyRegion.subtract(newDirtyRegion));
772            if (!copyback.isEmpty())
773                copyBlt(backBuffer, frontBuffer, copyback);
774        } else {
775            // if we can't copy-back anything, modify the user's dirty
776            // region to make sure they redraw the whole buffer
777            newDirtyRegion.set(bounds);
778            mDirtyRegion.clear();
779            Mutex::Autolock lock(mMutex);
780            for (size_t i=0 ; i<NUM_BUFFER_SLOTS ; i++) {
781                mSlots[i].dirtyRegion.clear();
782            }
783        }
784
785
786        { // scope for the lock
787            Mutex::Autolock lock(mMutex);
788            int backBufferSlot(getSlotFromBufferLocked(backBuffer.get()));
789            if (backBufferSlot >= 0) {
790                Region& dirtyRegion(mSlots[backBufferSlot].dirtyRegion);
791                mDirtyRegion.subtract(dirtyRegion);
792                dirtyRegion = newDirtyRegion;
793            }
794        }
795
796        mDirtyRegion.orSelf(newDirtyRegion);
797        if (inOutDirtyBounds) {
798            *inOutDirtyBounds = newDirtyRegion.getBounds();
799        }
800
801        void* vaddr;
802        status_t res = backBuffer->lock(
803                GRALLOC_USAGE_SW_READ_OFTEN | GRALLOC_USAGE_SW_WRITE_OFTEN,
804                newDirtyRegion.bounds(), &vaddr);
805
806        ALOGW_IF(res, "failed locking buffer (handle = %p)",
807                backBuffer->handle);
808
809        if (res != 0) {
810            err = INVALID_OPERATION;
811        } else {
812            mLockedBuffer = backBuffer;
813            outBuffer->width  = backBuffer->width;
814            outBuffer->height = backBuffer->height;
815            outBuffer->stride = backBuffer->stride;
816            outBuffer->format = backBuffer->format;
817            outBuffer->bits   = vaddr;
818        }
819    }
820    return err;
821}
822
823status_t Surface::unlockAndPost()
824{
825    if (mLockedBuffer == 0) {
826        ALOGE("Surface::unlockAndPost failed, no locked buffer");
827        return INVALID_OPERATION;
828    }
829
830    status_t err = mLockedBuffer->unlock();
831    ALOGE_IF(err, "failed unlocking buffer (%p)", mLockedBuffer->handle);
832
833    err = queueBuffer(mLockedBuffer.get(), -1);
834    ALOGE_IF(err, "queueBuffer (handle=%p) failed (%s)",
835            mLockedBuffer->handle, strerror(-err));
836
837    mPostedBuffer = mLockedBuffer;
838    mLockedBuffer = 0;
839    return err;
840}
841
842}; // namespace android
843