Surface.cpp revision 14fab7dd794cd6bf29e6425340683c6221062b3c 
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 = true;
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,
179        int* fenceFd) {
180    ATRACE_CALL();
181    ALOGV("Surface::dequeueBuffer");
182    Mutex::Autolock lock(mMutex);
183    int buf = -1;
184    int reqW = mReqWidth ? mReqWidth : mUserWidth;
185    int reqH = mReqHeight ? mReqHeight : mUserHeight;
186    sp<Fence> fence;
187    status_t result = mGraphicBufferProducer->dequeueBuffer(&buf, &fence, mSwapIntervalZero,
188            reqW, reqH, mReqFormat, mReqUsage);
189    if (result < 0) {
190        ALOGV("dequeueBuffer: IGraphicBufferProducer::dequeueBuffer(%d, %d, %d, %d)"
191             "failed: %d", mReqWidth, mReqHeight, mReqFormat, mReqUsage,
192             result);
193        return result;
194    }
195    sp<GraphicBuffer>& gbuf(mSlots[buf].buffer);
196    if (result & IGraphicBufferProducer::RELEASE_ALL_BUFFERS) {
197        freeAllBuffers();
198    }
199
200    if ((result & IGraphicBufferProducer::BUFFER_NEEDS_REALLOCATION) || gbuf == 0) {
201        result = mGraphicBufferProducer->requestBuffer(buf, &gbuf);
202        if (result != NO_ERROR) {
203            ALOGE("dequeueBuffer: IGraphicBufferProducer::requestBuffer failed: %d",
204                    result);
205            return result;
206        }
207    }
208
209    if (fence->isValid()) {
210        *fenceFd = fence->dup();
211        if (*fenceFd == -1) {
212            ALOGE("dequeueBuffer: error duping fence: %d", errno);
213            // dup() should never fail; something is badly wrong. Soldier on
214            // and hope for the best; the worst that should happen is some
215            // visible corruption that lasts until the next frame.
216        }
217    } else {
218        *fenceFd = -1;
219    }
220
221    *buffer = gbuf.get();
222    return OK;
223}
224
225int Surface::cancelBuffer(android_native_buffer_t* buffer,
226        int fenceFd) {
227    ATRACE_CALL();
228    ALOGV("Surface::cancelBuffer");
229    Mutex::Autolock lock(mMutex);
230    int i = getSlotFromBufferLocked(buffer);
231    if (i < 0) {
232        return i;
233    }
234    sp<Fence> fence(fenceFd >= 0 ? new Fence(fenceFd) : Fence::NO_FENCE);
235    mGraphicBufferProducer->cancelBuffer(i, fence);
236    return OK;
237}
238
239int Surface::getSlotFromBufferLocked(
240        android_native_buffer_t* buffer) const {
241    bool dumpedState = false;
242    for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
243        if (mSlots[i].buffer != NULL &&
244                mSlots[i].buffer->handle == buffer->handle) {
245            return i;
246        }
247    }
248    ALOGE("getSlotFromBufferLocked: unknown buffer: %p", buffer->handle);
249    return BAD_VALUE;
250}
251
252int Surface::lockBuffer_DEPRECATED(android_native_buffer_t* buffer) {
253    ALOGV("Surface::lockBuffer");
254    Mutex::Autolock lock(mMutex);
255    return OK;
256}
257
258int Surface::queueBuffer(android_native_buffer_t* buffer, int fenceFd) {
259    ATRACE_CALL();
260    ALOGV("Surface::queueBuffer");
261    Mutex::Autolock lock(mMutex);
262    int64_t timestamp;
263    if (mTimestamp == NATIVE_WINDOW_TIMESTAMP_AUTO) {
264        timestamp = 0;
265    } else {
266        timestamp = mTimestamp;
267    }
268    int i = getSlotFromBufferLocked(buffer);
269    if (i < 0) {
270        return i;
271    }
272
273
274    // Make sure the crop rectangle is entirely inside the buffer.
275    Rect crop;
276    mCrop.intersect(Rect(buffer->width, buffer->height), &crop);
277
278    sp<Fence> fence(fenceFd >= 0 ? new Fence(fenceFd) : Fence::NO_FENCE);
279    IGraphicBufferProducer::QueueBufferOutput output;
280    IGraphicBufferProducer::QueueBufferInput input(timestamp, crop, mScalingMode,
281            mTransform, mSwapIntervalZero, fence);
282    status_t err = mGraphicBufferProducer->queueBuffer(i, input, &output);
283    if (err != OK)  {
284        ALOGE("queueBuffer: error queuing buffer to SurfaceTexture, %d", err);
285    }
286    uint32_t numPendingBuffers = 0;
287    output.deflate(&mDefaultWidth, &mDefaultHeight, &mTransformHint,
288            &numPendingBuffers);
289
290    mConsumerRunningBehind = (numPendingBuffers >= 2);
291
292    return err;
293}
294
295int Surface::query(int what, int* value) const {
296    ATRACE_CALL();
297    ALOGV("Surface::query");
298    { // scope for the lock
299        Mutex::Autolock lock(mMutex);
300        switch (what) {
301            case NATIVE_WINDOW_FORMAT:
302                if (mReqFormat) {
303                    *value = mReqFormat;
304                    return NO_ERROR;
305                }
306                break;
307            case NATIVE_WINDOW_QUEUES_TO_WINDOW_COMPOSER: {
308                sp<ISurfaceComposer> composer(
309                        ComposerService::getComposerService());
310                if (composer->authenticateSurfaceTexture(mGraphicBufferProducer)) {
311                    *value = 1;
312                } else {
313                    *value = 0;
314                }
315                return NO_ERROR;
316            }
317            case NATIVE_WINDOW_CONCRETE_TYPE:
318                *value = NATIVE_WINDOW_SURFACE;
319                return NO_ERROR;
320            case NATIVE_WINDOW_DEFAULT_WIDTH:
321                *value = mUserWidth ? mUserWidth : mDefaultWidth;
322                return NO_ERROR;
323            case NATIVE_WINDOW_DEFAULT_HEIGHT:
324                *value = mUserHeight ? mUserHeight : mDefaultHeight;
325                return NO_ERROR;
326            case NATIVE_WINDOW_TRANSFORM_HINT:
327                *value = mTransformHint;
328                return NO_ERROR;
329            case NATIVE_WINDOW_CONSUMER_RUNNING_BEHIND: {
330                status_t err = NO_ERROR;
331                if (!mConsumerRunningBehind) {
332                    *value = 0;
333                } else {
334                    err = mGraphicBufferProducer->query(what, value);
335                    if (err == NO_ERROR) {
336                        mConsumerRunningBehind = *value;
337                    }
338                }
339                return err;
340            }
341        }
342    }
343    return mGraphicBufferProducer->query(what, value);
344}
345
346int Surface::perform(int operation, va_list args)
347{
348    int res = NO_ERROR;
349    switch (operation) {
350    case NATIVE_WINDOW_CONNECT:
351        // deprecated. must return NO_ERROR.
352        break;
353    case NATIVE_WINDOW_DISCONNECT:
354        // deprecated. must return NO_ERROR.
355        break;
356    case NATIVE_WINDOW_SET_USAGE:
357        res = dispatchSetUsage(args);
358        break;
359    case NATIVE_WINDOW_SET_CROP:
360        res = dispatchSetCrop(args);
361        break;
362    case NATIVE_WINDOW_SET_BUFFER_COUNT:
363        res = dispatchSetBufferCount(args);
364        break;
365    case NATIVE_WINDOW_SET_BUFFERS_GEOMETRY:
366        res = dispatchSetBuffersGeometry(args);
367        break;
368    case NATIVE_WINDOW_SET_BUFFERS_TRANSFORM:
369        res = dispatchSetBuffersTransform(args);
370        break;
371    case NATIVE_WINDOW_SET_BUFFERS_TIMESTAMP:
372        res = dispatchSetBuffersTimestamp(args);
373        break;
374    case NATIVE_WINDOW_SET_BUFFERS_DIMENSIONS:
375        res = dispatchSetBuffersDimensions(args);
376        break;
377    case NATIVE_WINDOW_SET_BUFFERS_USER_DIMENSIONS:
378        res = dispatchSetBuffersUserDimensions(args);
379        break;
380    case NATIVE_WINDOW_SET_BUFFERS_FORMAT:
381        res = dispatchSetBuffersFormat(args);
382        break;
383    case NATIVE_WINDOW_LOCK:
384        res = dispatchLock(args);
385        break;
386    case NATIVE_WINDOW_UNLOCK_AND_POST:
387        res = dispatchUnlockAndPost(args);
388        break;
389    case NATIVE_WINDOW_SET_SCALING_MODE:
390        res = dispatchSetScalingMode(args);
391        break;
392    case NATIVE_WINDOW_API_CONNECT:
393        res = dispatchConnect(args);
394        break;
395    case NATIVE_WINDOW_API_DISCONNECT:
396        res = dispatchDisconnect(args);
397        break;
398    default:
399        res = NAME_NOT_FOUND;
400        break;
401    }
402    return res;
403}
404
405int Surface::dispatchConnect(va_list args) {
406    int api = va_arg(args, int);
407    return connect(api);
408}
409
410int Surface::dispatchDisconnect(va_list args) {
411    int api = va_arg(args, int);
412    return disconnect(api);
413}
414
415int Surface::dispatchSetUsage(va_list args) {
416    int usage = va_arg(args, int);
417    return setUsage(usage);
418}
419
420int Surface::dispatchSetCrop(va_list args) {
421    android_native_rect_t const* rect = va_arg(args, android_native_rect_t*);
422    return setCrop(reinterpret_cast<Rect const*>(rect));
423}
424
425int Surface::dispatchSetBufferCount(va_list args) {
426    size_t bufferCount = va_arg(args, size_t);
427    return setBufferCount(bufferCount);
428}
429
430int Surface::dispatchSetBuffersGeometry(va_list args) {
431    int w = va_arg(args, int);
432    int h = va_arg(args, int);
433    int f = va_arg(args, int);
434    int err = setBuffersDimensions(w, h);
435    if (err != 0) {
436        return err;
437    }
438    return setBuffersFormat(f);
439}
440
441int Surface::dispatchSetBuffersDimensions(va_list args) {
442    int w = va_arg(args, int);
443    int h = va_arg(args, int);
444    return setBuffersDimensions(w, h);
445}
446
447int Surface::dispatchSetBuffersUserDimensions(va_list args) {
448    int w = va_arg(args, int);
449    int h = va_arg(args, int);
450    return setBuffersUserDimensions(w, h);
451}
452
453int Surface::dispatchSetBuffersFormat(va_list args) {
454    int f = va_arg(args, int);
455    return setBuffersFormat(f);
456}
457
458int Surface::dispatchSetScalingMode(va_list args) {
459    int m = va_arg(args, int);
460    return setScalingMode(m);
461}
462
463int Surface::dispatchSetBuffersTransform(va_list args) {
464    int transform = va_arg(args, int);
465    return setBuffersTransform(transform);
466}
467
468int Surface::dispatchSetBuffersTimestamp(va_list args) {
469    int64_t timestamp = va_arg(args, int64_t);
470    return setBuffersTimestamp(timestamp);
471}
472
473int Surface::dispatchLock(va_list args) {
474    ANativeWindow_Buffer* outBuffer = va_arg(args, ANativeWindow_Buffer*);
475    ARect* inOutDirtyBounds = va_arg(args, ARect*);
476    return lock(outBuffer, inOutDirtyBounds);
477}
478
479int Surface::dispatchUnlockAndPost(va_list args) {
480    return unlockAndPost();
481}
482
483
484int Surface::connect(int api) {
485    ATRACE_CALL();
486    ALOGV("Surface::connect");
487    Mutex::Autolock lock(mMutex);
488    IGraphicBufferProducer::QueueBufferOutput output;
489    int err = mGraphicBufferProducer->connect(api, mProducerControlledByApp, &output);
490    if (err == NO_ERROR) {
491        uint32_t numPendingBuffers = 0;
492        output.deflate(&mDefaultWidth, &mDefaultHeight, &mTransformHint,
493                &numPendingBuffers);
494        mConsumerRunningBehind = (numPendingBuffers >= 2);
495    }
496    if (!err && api == NATIVE_WINDOW_API_CPU) {
497        mConnectedToCpu = true;
498    }
499    return err;
500}
501
502int Surface::disconnect(int api) {
503    ATRACE_CALL();
504    ALOGV("Surface::disconnect");
505    Mutex::Autolock lock(mMutex);
506    freeAllBuffers();
507    int err = mGraphicBufferProducer->disconnect(api);
508    if (!err) {
509        mReqFormat = 0;
510        mReqWidth = 0;
511        mReqHeight = 0;
512        mReqUsage = 0;
513        mCrop.clear();
514        mScalingMode = NATIVE_WINDOW_SCALING_MODE_FREEZE;
515        mTransform = 0;
516        if (api == NATIVE_WINDOW_API_CPU) {
517            mConnectedToCpu = false;
518        }
519    }
520    return err;
521}
522
523int Surface::setUsage(uint32_t reqUsage)
524{
525    ALOGV("Surface::setUsage");
526    Mutex::Autolock lock(mMutex);
527    mReqUsage = reqUsage;
528    return OK;
529}
530
531int Surface::setCrop(Rect const* rect)
532{
533    ATRACE_CALL();
534
535    Rect realRect;
536    if (rect == NULL || rect->isEmpty()) {
537        realRect.clear();
538    } else {
539        realRect = *rect;
540    }
541
542    ALOGV("Surface::setCrop rect=[%d %d %d %d]",
543            realRect.left, realRect.top, realRect.right, realRect.bottom);
544
545    Mutex::Autolock lock(mMutex);
546    mCrop = realRect;
547    return NO_ERROR;
548}
549
550int Surface::setBufferCount(int bufferCount)
551{
552    ATRACE_CALL();
553    ALOGV("Surface::setBufferCount");
554    Mutex::Autolock lock(mMutex);
555
556    status_t err = mGraphicBufferProducer->setBufferCount(bufferCount);
557    ALOGE_IF(err, "IGraphicBufferProducer::setBufferCount(%d) returned %s",
558            bufferCount, strerror(-err));
559
560    if (err == NO_ERROR) {
561        freeAllBuffers();
562    }
563
564    return err;
565}
566
567int Surface::setBuffersDimensions(int w, int h)
568{
569    ATRACE_CALL();
570    ALOGV("Surface::setBuffersDimensions");
571
572    if (w<0 || h<0)
573        return BAD_VALUE;
574
575    if ((w && !h) || (!w && h))
576        return BAD_VALUE;
577
578    Mutex::Autolock lock(mMutex);
579    mReqWidth = w;
580    mReqHeight = h;
581    return NO_ERROR;
582}
583
584int Surface::setBuffersUserDimensions(int w, int h)
585{
586    ATRACE_CALL();
587    ALOGV("Surface::setBuffersUserDimensions");
588
589    if (w<0 || h<0)
590        return BAD_VALUE;
591
592    if ((w && !h) || (!w && h))
593        return BAD_VALUE;
594
595    Mutex::Autolock lock(mMutex);
596    mUserWidth = w;
597    mUserHeight = h;
598    return NO_ERROR;
599}
600
601int Surface::setBuffersFormat(int format)
602{
603    ALOGV("Surface::setBuffersFormat");
604
605    if (format<0)
606        return BAD_VALUE;
607
608    Mutex::Autolock lock(mMutex);
609    mReqFormat = format;
610    return NO_ERROR;
611}
612
613int Surface::setScalingMode(int mode)
614{
615    ATRACE_CALL();
616    ALOGV("Surface::setScalingMode(%d)", mode);
617
618    switch (mode) {
619        case NATIVE_WINDOW_SCALING_MODE_FREEZE:
620        case NATIVE_WINDOW_SCALING_MODE_SCALE_TO_WINDOW:
621        case NATIVE_WINDOW_SCALING_MODE_SCALE_CROP:
622            break;
623        default:
624            ALOGE("unknown scaling mode: %d", mode);
625            return BAD_VALUE;
626    }
627
628    Mutex::Autolock lock(mMutex);
629    mScalingMode = mode;
630    return NO_ERROR;
631}
632
633int Surface::setBuffersTransform(int transform)
634{
635    ATRACE_CALL();
636    ALOGV("Surface::setBuffersTransform");
637    Mutex::Autolock lock(mMutex);
638    mTransform = transform;
639    return NO_ERROR;
640}
641
642int Surface::setBuffersTimestamp(int64_t timestamp)
643{
644    ALOGV("Surface::setBuffersTimestamp");
645    Mutex::Autolock lock(mMutex);
646    mTimestamp = timestamp;
647    return NO_ERROR;
648}
649
650void Surface::freeAllBuffers() {
651    for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
652        mSlots[i].buffer = 0;
653    }
654}
655
656// ----------------------------------------------------------------------
657// the lock/unlock APIs must be used from the same thread
658
659static status_t copyBlt(
660        const sp<GraphicBuffer>& dst,
661        const sp<GraphicBuffer>& src,
662        const Region& reg)
663{
664    // src and dst with, height and format must be identical. no verification
665    // is done here.
666    status_t err;
667    uint8_t const * src_bits = NULL;
668    err = src->lock(GRALLOC_USAGE_SW_READ_OFTEN, reg.bounds(), (void**)&src_bits);
669    ALOGE_IF(err, "error locking src buffer %s", strerror(-err));
670
671    uint8_t* dst_bits = NULL;
672    err = dst->lock(GRALLOC_USAGE_SW_WRITE_OFTEN, reg.bounds(), (void**)&dst_bits);
673    ALOGE_IF(err, "error locking dst buffer %s", strerror(-err));
674
675    Region::const_iterator head(reg.begin());
676    Region::const_iterator tail(reg.end());
677    if (head != tail && src_bits && dst_bits) {
678        const size_t bpp = bytesPerPixel(src->format);
679        const size_t dbpr = dst->stride * bpp;
680        const size_t sbpr = src->stride * bpp;
681
682        while (head != tail) {
683            const Rect& r(*head++);
684            ssize_t h = r.height();
685            if (h <= 0) continue;
686            size_t size = r.width() * bpp;
687            uint8_t const * s = src_bits + (r.left + src->stride * r.top) * bpp;
688            uint8_t       * d = dst_bits + (r.left + dst->stride * r.top) * bpp;
689            if (dbpr==sbpr && size==sbpr) {
690                size *= h;
691                h = 1;
692            }
693            do {
694                memcpy(d, s, size);
695                d += dbpr;
696                s += sbpr;
697            } while (--h > 0);
698        }
699    }
700
701    if (src_bits)
702        src->unlock();
703
704    if (dst_bits)
705        dst->unlock();
706
707    return err;
708}
709
710// ----------------------------------------------------------------------------
711
712status_t Surface::lock(
713        ANativeWindow_Buffer* outBuffer, ARect* inOutDirtyBounds)
714{
715    if (mLockedBuffer != 0) {
716        ALOGE("Surface::lock failed, already locked");
717        return INVALID_OPERATION;
718    }
719
720    if (!mConnectedToCpu) {
721        int err = Surface::connect(NATIVE_WINDOW_API_CPU);
722        if (err) {
723            return err;
724        }
725        // we're intending to do software rendering from this point
726        setUsage(GRALLOC_USAGE_SW_READ_OFTEN | GRALLOC_USAGE_SW_WRITE_OFTEN);
727    }
728
729    ANativeWindowBuffer* out;
730    int fenceFd = -1;
731    status_t err = dequeueBuffer(&out, &fenceFd);
732    ALOGE_IF(err, "dequeueBuffer failed (%s)", strerror(-err));
733    if (err == NO_ERROR) {
734        sp<GraphicBuffer> backBuffer(GraphicBuffer::getSelf(out));
735        sp<Fence> fence(new Fence(fenceFd));
736
737        err = fence->waitForever("Surface::lock");
738        if (err != OK) {
739            ALOGE("Fence::wait failed (%s)", strerror(-err));
740            cancelBuffer(out, fenceFd);
741            return err;
742        }
743
744        const Rect bounds(backBuffer->width, backBuffer->height);
745
746        Region newDirtyRegion;
747        if (inOutDirtyBounds) {
748            newDirtyRegion.set(static_cast<Rect const&>(*inOutDirtyBounds));
749            newDirtyRegion.andSelf(bounds);
750        } else {
751            newDirtyRegion.set(bounds);
752        }
753
754        // figure out if we can copy the frontbuffer back
755        const sp<GraphicBuffer>& frontBuffer(mPostedBuffer);
756        const bool canCopyBack = (frontBuffer != 0 &&
757                backBuffer->width  == frontBuffer->width &&
758                backBuffer->height == frontBuffer->height &&
759                backBuffer->format == frontBuffer->format);
760
761        if (canCopyBack) {
762            // copy the area that is invalid and not repainted this round
763            const Region copyback(mDirtyRegion.subtract(newDirtyRegion));
764            if (!copyback.isEmpty())
765                copyBlt(backBuffer, frontBuffer, copyback);
766        } else {
767            // if we can't copy-back anything, modify the user's dirty
768            // region to make sure they redraw the whole buffer
769            newDirtyRegion.set(bounds);
770            mDirtyRegion.clear();
771            Mutex::Autolock lock(mMutex);
772            for (size_t i=0 ; i<NUM_BUFFER_SLOTS ; i++) {
773                mSlots[i].dirtyRegion.clear();
774            }
775        }
776
777
778        { // scope for the lock
779            Mutex::Autolock lock(mMutex);
780            int backBufferSlot(getSlotFromBufferLocked(backBuffer.get()));
781            if (backBufferSlot >= 0) {
782                Region& dirtyRegion(mSlots[backBufferSlot].dirtyRegion);
783                mDirtyRegion.subtract(dirtyRegion);
784                dirtyRegion = newDirtyRegion;
785            }
786        }
787
788        mDirtyRegion.orSelf(newDirtyRegion);
789        if (inOutDirtyBounds) {
790            *inOutDirtyBounds = newDirtyRegion.getBounds();
791        }
792
793        void* vaddr;
794        status_t res = backBuffer->lock(
795                GRALLOC_USAGE_SW_READ_OFTEN | GRALLOC_USAGE_SW_WRITE_OFTEN,
796                newDirtyRegion.bounds(), &vaddr);
797
798        ALOGW_IF(res, "failed locking buffer (handle = %p)",
799                backBuffer->handle);
800
801        if (res != 0) {
802            err = INVALID_OPERATION;
803        } else {
804            mLockedBuffer = backBuffer;
805            outBuffer->width  = backBuffer->width;
806            outBuffer->height = backBuffer->height;
807            outBuffer->stride = backBuffer->stride;
808            outBuffer->format = backBuffer->format;
809            outBuffer->bits   = vaddr;
810        }
811    }
812    return err;
813}
814
815status_t Surface::unlockAndPost()
816{
817    if (mLockedBuffer == 0) {
818        ALOGE("Surface::unlockAndPost failed, no locked buffer");
819        return INVALID_OPERATION;
820    }
821
822    status_t err = mLockedBuffer->unlock();
823    ALOGE_IF(err, "failed unlocking buffer (%p)", mLockedBuffer->handle);
824
825    err = queueBuffer(mLockedBuffer.get(), -1);
826    ALOGE_IF(err, "queueBuffer (handle=%p) failed (%s)",
827            mLockedBuffer->handle, strerror(-err));
828
829    mPostedBuffer = mLockedBuffer;
830    mLockedBuffer = 0;
831    return err;
832}
833
834}; // namespace android
835