libs/gui/SurfaceTextureClient.cpp

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