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      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 ATRACE_TAG ATRACE_TAG_GRAPHICS
     18 
     19 // Uncomment this to remove support for HWC_DEVICE_API_VERSION_0_3 and older
     20 #define HWC_REMOVE_DEPRECATED_VERSIONS 1
     21 
     22 #include <stdint.h>
     23 #include <stdio.h>
     24 #include <stdlib.h>
     25 #include <string.h>
     26 #include <sys/types.h>
     27 
     28 #include <utils/CallStack.h>
     29 #include <utils/Errors.h>
     30 #include <utils/misc.h>
     31 #include <utils/String8.h>
     32 #include <utils/Thread.h>
     33 #include <utils/Trace.h>
     34 #include <utils/Vector.h>
     35 
     36 #include <ui/GraphicBuffer.h>
     37 
     38 #include <hardware/hardware.h>
     39 #include <hardware/hwcomposer.h>
     40 
     41 #include <android/configuration.h>
     42 
     43 #include <cutils/log.h>
     44 #include <cutils/properties.h>
     45 
     46 #include "HWComposer.h"
     47 
     48 #include "../Layer.h"           // needed only for debugging
     49 #include "../SurfaceFlinger.h"
     50 
     51 namespace android {
     52 
     53 // This is not a real HWC version. It's used for in-development features that
     54 // haven't been committed to a specific real HWC version.
     55 #define HWC_DEVICE_API_VERSION_1_EXP HARDWARE_DEVICE_API_VERSION_2(1, 0xFF, HWC_HEADER_VERSION)
     56 
     57 #define MIN_HWC_HEADER_VERSION HWC_HEADER_VERSION
     58 
     59 #define NUM_PHYSICAL_DISPLAYS HWC_NUM_DISPLAY_TYPES
     60 #define VIRTUAL_DISPLAY_ID_BASE HWC_NUM_DISPLAY_TYPES
     61 
     62 static uint32_t hwcApiVersion(const hwc_composer_device_1_t* hwc) {
     63     uint32_t hwcVersion = hwc->common.version;
     64     return hwcVersion & HARDWARE_API_VERSION_2_MAJ_MIN_MASK;
     65 }
     66 
     67 static uint32_t hwcHeaderVersion(const hwc_composer_device_1_t* hwc) {
     68     uint32_t hwcVersion = hwc->common.version;
     69     return hwcVersion & HARDWARE_API_VERSION_2_HEADER_MASK;
     70 }
     71 
     72 static bool hwcHasApiVersion(const hwc_composer_device_1_t* hwc,
     73         uint32_t version) {
     74     return hwcApiVersion(hwc) >= (version & HARDWARE_API_VERSION_2_MAJ_MIN_MASK);
     75 }
     76 
     77 // ---------------------------------------------------------------------------
     78 
     79 struct HWComposer::cb_context {
     80     struct callbacks : public hwc_procs_t {
     81         // these are here to facilitate the transition when adding
     82         // new callbacks (an implementation can check for NULL before
     83         // calling a new callback).
     84         void (*zero[4])(void);
     85     };
     86     callbacks procs;
     87     HWComposer* hwc;
     88 };
     89 
     90 // ---------------------------------------------------------------------------
     91 
     92 HWComposer::HWComposer(
     93         const sp<SurfaceFlinger>& flinger,
     94         EventHandler& handler)
     95     : mFlinger(flinger),
     96       mFbDev(0), mHwc(0), mNumDisplays(1),
     97       mCBContext(new cb_context),
     98       mEventHandler(handler),
     99       mVSyncCount(0), mDebugForceFakeVSync(false)
    100 {
    101     for (size_t i =0 ; i<MAX_DISPLAYS ; i++) {
    102         mLists[i] = 0;
    103     }
    104 
    105     char value[PROPERTY_VALUE_MAX];
    106     property_get("debug.sf.no_hw_vsync", value, "0");
    107     mDebugForceFakeVSync = atoi(value);
    108 
    109     bool needVSyncThread = true;
    110 
    111     // Note: some devices may insist that the FB HAL be opened before HWC.
    112     int fberr = loadFbHalModule();
    113     loadHwcModule();
    114 
    115     if (mFbDev && mHwc && hwcHasApiVersion(mHwc, HWC_DEVICE_API_VERSION_1_1)) {
    116         // close FB HAL if we don't needed it.
    117         // FIXME: this is temporary until we're not forced to open FB HAL
    118         // before HWC.
    119         framebuffer_close(mFbDev);
    120         mFbDev = NULL;
    121     }
    122 
    123     // If we have no HWC, or a pre-1.1 HWC, an FB dev is mandatory.
    124     if ((!mHwc || !hwcHasApiVersion(mHwc, HWC_DEVICE_API_VERSION_1_1))
    125             && !mFbDev) {
    126         ALOGE("ERROR: failed to open framebuffer (%s), aborting",
    127                 strerror(-fberr));
    128         abort();
    129     }
    130 
    131     // these display IDs are always reserved
    132     for (size_t i=0 ; i<NUM_PHYSICAL_DISPLAYS ; i++) {
    133         mAllocatedDisplayIDs.markBit(i);
    134     }
    135 
    136     if (mHwc) {
    137         ALOGI("Using %s version %u.%u", HWC_HARDWARE_COMPOSER,
    138               (hwcApiVersion(mHwc) >> 24) & 0xff,
    139               (hwcApiVersion(mHwc) >> 16) & 0xff);
    140         if (mHwc->registerProcs) {
    141             mCBContext->hwc = this;
    142             mCBContext->procs.invalidate = &hook_invalidate;
    143             mCBContext->procs.vsync = &hook_vsync;
    144             if (hwcHasApiVersion(mHwc, HWC_DEVICE_API_VERSION_1_1))
    145                 mCBContext->procs.hotplug = &hook_hotplug;
    146             else
    147                 mCBContext->procs.hotplug = NULL;
    148             memset(mCBContext->procs.zero, 0, sizeof(mCBContext->procs.zero));
    149             mHwc->registerProcs(mHwc, &mCBContext->procs);
    150         }
    151 
    152         // don't need a vsync thread if we have a hardware composer
    153         needVSyncThread = false;
    154         // always turn vsync off when we start
    155         eventControl(HWC_DISPLAY_PRIMARY, HWC_EVENT_VSYNC, 0);
    156 
    157         // the number of displays we actually have depends on the
    158         // hw composer version
    159         if (hwcHasApiVersion(mHwc, HWC_DEVICE_API_VERSION_1_EXP)) {
    160             // 1.?? adds support for virtual displays
    161             mNumDisplays = MAX_DISPLAYS;
    162         } else if (hwcHasApiVersion(mHwc, HWC_DEVICE_API_VERSION_1_1)) {
    163             // 1.1 adds support for multiple displays
    164             mNumDisplays = NUM_PHYSICAL_DISPLAYS;
    165         } else {
    166             mNumDisplays = 1;
    167         }
    168     }
    169 
    170     if (mFbDev) {
    171         ALOG_ASSERT(!(mHwc && hwcHasApiVersion(mHwc, HWC_DEVICE_API_VERSION_1_1)),
    172                 "should only have fbdev if no hwc or hwc is 1.0");
    173 
    174         DisplayData& disp(mDisplayData[HWC_DISPLAY_PRIMARY]);
    175         disp.connected = true;
    176         disp.width = mFbDev->width;
    177         disp.height = mFbDev->height;
    178         disp.format = mFbDev->format;
    179         disp.xdpi = mFbDev->xdpi;
    180         disp.ydpi = mFbDev->ydpi;
    181         if (disp.refresh == 0) {
    182             disp.refresh = nsecs_t(1e9 / mFbDev->fps);
    183             ALOGW("getting VSYNC period from fb HAL: %lld", disp.refresh);
    184         }
    185         if (disp.refresh == 0) {
    186             disp.refresh = nsecs_t(1e9 / 60.0);
    187             ALOGW("getting VSYNC period from thin air: %lld",
    188                     mDisplayData[HWC_DISPLAY_PRIMARY].refresh);
    189         }
    190     } else if (mHwc) {
    191         // here we're guaranteed to have at least HWC 1.1
    192         for (size_t i =0 ; i<NUM_PHYSICAL_DISPLAYS ; i++) {
    193             queryDisplayProperties(i);
    194         }
    195     }
    196 
    197     if (needVSyncThread) {
    198         // we don't have VSYNC support, we need to fake it
    199         mVSyncThread = new VSyncThread(*this);
    200     }
    201 }
    202 
    203 HWComposer::~HWComposer() {
    204     if (mHwc) {
    205         eventControl(HWC_DISPLAY_PRIMARY, HWC_EVENT_VSYNC, 0);
    206     }
    207     if (mVSyncThread != NULL) {
    208         mVSyncThread->requestExitAndWait();
    209     }
    210     if (mHwc) {
    211         hwc_close_1(mHwc);
    212     }
    213     if (mFbDev) {
    214         framebuffer_close(mFbDev);
    215     }
    216     delete mCBContext;
    217 }
    218 
    219 // Load and prepare the hardware composer module.  Sets mHwc.
    220 void HWComposer::loadHwcModule()
    221 {
    222     hw_module_t const* module;
    223 
    224     if (hw_get_module(HWC_HARDWARE_MODULE_ID, &module) != 0) {
    225         ALOGE("%s module not found", HWC_HARDWARE_MODULE_ID);
    226         return;
    227     }
    228 
    229     int err = hwc_open_1(module, &mHwc);
    230     if (err) {
    231         ALOGE("%s device failed to initialize (%s)",
    232               HWC_HARDWARE_COMPOSER, strerror(-err));
    233         return;
    234     }
    235 
    236     if (!hwcHasApiVersion(mHwc, HWC_DEVICE_API_VERSION_1_0) ||
    237             hwcHeaderVersion(mHwc) < MIN_HWC_HEADER_VERSION ||
    238             hwcHeaderVersion(mHwc) > HWC_HEADER_VERSION) {
    239         ALOGE("%s device version %#x unsupported, will not be used",
    240               HWC_HARDWARE_COMPOSER, mHwc->common.version);
    241         hwc_close_1(mHwc);
    242         mHwc = NULL;
    243         return;
    244     }
    245 }
    246 
    247 // Load and prepare the FB HAL, which uses the gralloc module.  Sets mFbDev.
    248 int HWComposer::loadFbHalModule()
    249 {
    250     hw_module_t const* module;
    251 
    252     int err = hw_get_module(GRALLOC_HARDWARE_MODULE_ID, &module);
    253     if (err != 0) {
    254         ALOGE("%s module not found", GRALLOC_HARDWARE_MODULE_ID);
    255         return err;
    256     }
    257 
    258     return framebuffer_open(module, &mFbDev);
    259 }
    260 
    261 status_t HWComposer::initCheck() const {
    262     return mHwc ? NO_ERROR : NO_INIT;
    263 }
    264 
    265 void HWComposer::hook_invalidate(const struct hwc_procs* procs) {
    266     cb_context* ctx = reinterpret_cast<cb_context*>(
    267             const_cast<hwc_procs_t*>(procs));
    268     ctx->hwc->invalidate();
    269 }
    270 
    271 void HWComposer::hook_vsync(const struct hwc_procs* procs, int disp,
    272         int64_t timestamp) {
    273     cb_context* ctx = reinterpret_cast<cb_context*>(
    274             const_cast<hwc_procs_t*>(procs));
    275     ctx->hwc->vsync(disp, timestamp);
    276 }
    277 
    278 void HWComposer::hook_hotplug(const struct hwc_procs* procs, int disp,
    279         int connected) {
    280     cb_context* ctx = reinterpret_cast<cb_context*>(
    281             const_cast<hwc_procs_t*>(procs));
    282     ctx->hwc->hotplug(disp, connected);
    283 }
    284 
    285 void HWComposer::invalidate() {
    286     mFlinger->repaintEverything();
    287 }
    288 
    289 void HWComposer::vsync(int disp, int64_t timestamp) {
    290     ATRACE_INT("VSYNC", ++mVSyncCount&1);
    291     mEventHandler.onVSyncReceived(disp, timestamp);
    292     Mutex::Autolock _l(mLock);
    293     mLastHwVSync = timestamp;
    294 }
    295 
    296 void HWComposer::hotplug(int disp, int connected) {
    297     if (disp == HWC_DISPLAY_PRIMARY || disp >= VIRTUAL_DISPLAY_ID_BASE) {
    298         ALOGE("hotplug event received for invalid display: disp=%d connected=%d",
    299                 disp, connected);
    300         return;
    301     }
    302     queryDisplayProperties(disp);
    303     mEventHandler.onHotplugReceived(disp, bool(connected));
    304 }
    305 
    306 static float getDefaultDensity(uint32_t height) {
    307     if (height >= 1080) return ACONFIGURATION_DENSITY_XHIGH;
    308     else                return ACONFIGURATION_DENSITY_TV;
    309 }
    310 
    311 static const uint32_t DISPLAY_ATTRIBUTES[] = {
    312     HWC_DISPLAY_VSYNC_PERIOD,
    313     HWC_DISPLAY_WIDTH,
    314     HWC_DISPLAY_HEIGHT,
    315     HWC_DISPLAY_DPI_X,
    316     HWC_DISPLAY_DPI_Y,
    317     HWC_DISPLAY_NO_ATTRIBUTE,
    318 };
    319 #define NUM_DISPLAY_ATTRIBUTES (sizeof(DISPLAY_ATTRIBUTES) / sizeof(DISPLAY_ATTRIBUTES)[0])
    320 
    321 status_t HWComposer::queryDisplayProperties(int disp) {
    322 
    323     LOG_ALWAYS_FATAL_IF(!mHwc || !hwcHasApiVersion(mHwc, HWC_DEVICE_API_VERSION_1_1));
    324 
    325     // use zero as default value for unspecified attributes
    326     int32_t values[NUM_DISPLAY_ATTRIBUTES - 1];
    327     memset(values, 0, sizeof(values));
    328 
    329     uint32_t config;
    330     size_t numConfigs = 1;
    331     status_t err = mHwc->getDisplayConfigs(mHwc, disp, &config, &numConfigs);
    332     if (err != NO_ERROR) {
    333         // this can happen if an unpluggable display is not connected
    334         mDisplayData[disp].connected = false;
    335         return err;
    336     }
    337 
    338     err = mHwc->getDisplayAttributes(mHwc, disp, config, DISPLAY_ATTRIBUTES, values);
    339     if (err != NO_ERROR) {
    340         // we can't get this display's info. turn it off.
    341         mDisplayData[disp].connected = false;
    342         return err;
    343     }
    344 
    345     int32_t w = 0, h = 0;
    346     for (size_t i = 0; i < NUM_DISPLAY_ATTRIBUTES - 1; i++) {
    347         switch (DISPLAY_ATTRIBUTES[i]) {
    348         case HWC_DISPLAY_VSYNC_PERIOD:
    349             mDisplayData[disp].refresh = nsecs_t(values[i]);
    350             break;
    351         case HWC_DISPLAY_WIDTH:
    352             mDisplayData[disp].width = values[i];
    353             break;
    354         case HWC_DISPLAY_HEIGHT:
    355             mDisplayData[disp].height = values[i];
    356             break;
    357         case HWC_DISPLAY_DPI_X:
    358             mDisplayData[disp].xdpi = values[i] / 1000.0f;
    359             break;
    360         case HWC_DISPLAY_DPI_Y:
    361             mDisplayData[disp].ydpi = values[i] / 1000.0f;
    362             break;
    363         default:
    364             ALOG_ASSERT(false, "unknown display attribute[%d] %#x",
    365                     i, DISPLAY_ATTRIBUTES[i]);
    366             break;
    367         }
    368     }
    369 
    370     // FIXME: what should we set the format to?
    371     mDisplayData[disp].format = HAL_PIXEL_FORMAT_RGBA_8888;
    372     mDisplayData[disp].connected = true;
    373     if (mDisplayData[disp].xdpi == 0.0f || mDisplayData[disp].ydpi == 0.0f) {
    374         float dpi = getDefaultDensity(h);
    375         mDisplayData[disp].xdpi = dpi;
    376         mDisplayData[disp].ydpi = dpi;
    377     }
    378     return NO_ERROR;
    379 }
    380 
    381 status_t HWComposer::setVirtualDisplayProperties(int32_t id,
    382         uint32_t w, uint32_t h, uint32_t format) {
    383     if (id < VIRTUAL_DISPLAY_ID_BASE || id >= int32_t(mNumDisplays) ||
    384             !mAllocatedDisplayIDs.hasBit(id)) {
    385         return BAD_INDEX;
    386     }
    387     mDisplayData[id].width = w;
    388     mDisplayData[id].height = h;
    389     mDisplayData[id].format = format;
    390     mDisplayData[id].xdpi = mDisplayData[id].ydpi = getDefaultDensity(h);
    391     return NO_ERROR;
    392 }
    393 
    394 int32_t HWComposer::allocateDisplayId() {
    395     if (mAllocatedDisplayIDs.count() >= mNumDisplays) {
    396         return NO_MEMORY;
    397     }
    398     int32_t id = mAllocatedDisplayIDs.firstUnmarkedBit();
    399     mAllocatedDisplayIDs.markBit(id);
    400     mDisplayData[id].connected = true;
    401     return id;
    402 }
    403 
    404 status_t HWComposer::freeDisplayId(int32_t id) {
    405     if (id < NUM_PHYSICAL_DISPLAYS) {
    406         // cannot free the reserved IDs
    407         return BAD_VALUE;
    408     }
    409     if (uint32_t(id)>31 || !mAllocatedDisplayIDs.hasBit(id)) {
    410         return BAD_INDEX;
    411     }
    412     mAllocatedDisplayIDs.clearBit(id);
    413     mDisplayData[id].connected = false;
    414     return NO_ERROR;
    415 }
    416 
    417 nsecs_t HWComposer::getRefreshPeriod(int disp) const {
    418     return mDisplayData[disp].refresh;
    419 }
    420 
    421 nsecs_t HWComposer::getRefreshTimestamp(int disp) const {
    422     // this returns the last refresh timestamp.
    423     // if the last one is not available, we estimate it based on
    424     // the refresh period and whatever closest timestamp we have.
    425     Mutex::Autolock _l(mLock);
    426     nsecs_t now = systemTime(CLOCK_MONOTONIC);
    427     return now - ((now - mLastHwVSync) %  mDisplayData[disp].refresh);
    428 }
    429 
    430 sp<Fence> HWComposer::getDisplayFence(int disp) const {
    431     return mDisplayData[disp].lastDisplayFence;
    432 }
    433 
    434 uint32_t HWComposer::getWidth(int disp) const {
    435     return mDisplayData[disp].width;
    436 }
    437 
    438 uint32_t HWComposer::getHeight(int disp) const {
    439     return mDisplayData[disp].height;
    440 }
    441 
    442 uint32_t HWComposer::getFormat(int disp) const {
    443     return mDisplayData[disp].format;
    444 }
    445 
    446 float HWComposer::getDpiX(int disp) const {
    447     return mDisplayData[disp].xdpi;
    448 }
    449 
    450 float HWComposer::getDpiY(int disp) const {
    451     return mDisplayData[disp].ydpi;
    452 }
    453 
    454 bool HWComposer::isConnected(int disp) const {
    455     return mDisplayData[disp].connected;
    456 }
    457 
    458 void HWComposer::eventControl(int disp, int event, int enabled) {
    459     if (uint32_t(disp)>31 || !mAllocatedDisplayIDs.hasBit(disp)) {
    460         ALOGD("eventControl ignoring event %d on unallocated disp %d (en=%d)",
    461               event, disp, enabled);
    462         return;
    463     }
    464     if (event != EVENT_VSYNC) {
    465         ALOGW("eventControl got unexpected event %d (disp=%d en=%d)",
    466               event, disp, enabled);
    467         return;
    468     }
    469     status_t err = NO_ERROR;
    470     if (mHwc && !mDebugForceFakeVSync) {
    471         // NOTE: we use our own internal lock here because we have to call
    472         // into the HWC with the lock held, and we want to make sure
    473         // that even if HWC blocks (which it shouldn't), it won't
    474         // affect other threads.
    475         Mutex::Autolock _l(mEventControlLock);
    476         const int32_t eventBit = 1UL << event;
    477         const int32_t newValue = enabled ? eventBit : 0;
    478         const int32_t oldValue = mDisplayData[disp].events & eventBit;
    479         if (newValue != oldValue) {
    480             ATRACE_CALL();
    481             err = mHwc->eventControl(mHwc, disp, event, enabled);
    482             if (!err) {
    483                 int32_t& events(mDisplayData[disp].events);
    484                 events = (events & ~eventBit) | newValue;
    485             }
    486         }
    487         // error here should not happen -- not sure what we should
    488         // do if it does.
    489         ALOGE_IF(err, "eventControl(%d, %d) failed %s",
    490                 event, enabled, strerror(-err));
    491     }
    492 
    493     if (err == NO_ERROR && mVSyncThread != NULL) {
    494         mVSyncThread->setEnabled(enabled);
    495     }
    496 }
    497 
    498 status_t HWComposer::createWorkList(int32_t id, size_t numLayers) {
    499     if (uint32_t(id)>31 || !mAllocatedDisplayIDs.hasBit(id)) {
    500         return BAD_INDEX;
    501     }
    502 
    503     if (mHwc) {
    504         DisplayData& disp(mDisplayData[id]);
    505         if (hwcHasApiVersion(mHwc, HWC_DEVICE_API_VERSION_1_1)) {
    506             // we need space for the HWC_FRAMEBUFFER_TARGET
    507             numLayers++;
    508         }
    509         if (disp.capacity < numLayers || disp.list == NULL) {
    510             size_t size = sizeof(hwc_display_contents_1_t)
    511                     + numLayers * sizeof(hwc_layer_1_t);
    512             free(disp.list);
    513             disp.list = (hwc_display_contents_1_t*)malloc(size);
    514             disp.capacity = numLayers;
    515         }
    516         if (hwcHasApiVersion(mHwc, HWC_DEVICE_API_VERSION_1_1)) {
    517             disp.framebufferTarget = &disp.list->hwLayers[numLayers - 1];
    518             memset(disp.framebufferTarget, 0, sizeof(hwc_layer_1_t));
    519             const hwc_rect_t r = { 0, 0, (int) disp.width, (int) disp.height };
    520             disp.framebufferTarget->compositionType = HWC_FRAMEBUFFER_TARGET;
    521             disp.framebufferTarget->hints = 0;
    522             disp.framebufferTarget->flags = 0;
    523             disp.framebufferTarget->handle = disp.fbTargetHandle;
    524             disp.framebufferTarget->transform = 0;
    525             disp.framebufferTarget->blending = HWC_BLENDING_PREMULT;
    526             disp.framebufferTarget->sourceCrop = r;
    527             disp.framebufferTarget->displayFrame = r;
    528             disp.framebufferTarget->visibleRegionScreen.numRects = 1;
    529             disp.framebufferTarget->visibleRegionScreen.rects =
    530                 &disp.framebufferTarget->displayFrame;
    531             disp.framebufferTarget->acquireFenceFd = -1;
    532             disp.framebufferTarget->releaseFenceFd = -1;
    533             disp.framebufferTarget->planeAlpha = 0xFF;
    534         }
    535         disp.list->retireFenceFd = -1;
    536         disp.list->flags = HWC_GEOMETRY_CHANGED;
    537         disp.list->numHwLayers = numLayers;
    538     }
    539     return NO_ERROR;
    540 }
    541 
    542 status_t HWComposer::setFramebufferTarget(int32_t id,
    543         const sp<Fence>& acquireFence, const sp<GraphicBuffer>& buf) {
    544     if (uint32_t(id)>31 || !mAllocatedDisplayIDs.hasBit(id)) {
    545         return BAD_INDEX;
    546     }
    547     DisplayData& disp(mDisplayData[id]);
    548     if (!disp.framebufferTarget) {
    549         // this should never happen, but apparently eglCreateWindowSurface()
    550         // triggers a Surface::queueBuffer()  on some
    551         // devices (!?) -- log and ignore.
    552         ALOGE("HWComposer: framebufferTarget is null");
    553 //        CallStack stack;
    554 //        stack.update();
    555 //        stack.dump("");
    556         return NO_ERROR;
    557     }
    558 
    559     int acquireFenceFd = -1;
    560     if (acquireFence->isValid()) {
    561         acquireFenceFd = acquireFence->dup();
    562     }
    563 
    564     // ALOGD("fbPost: handle=%p, fence=%d", buf->handle, acquireFenceFd);
    565     disp.fbTargetHandle = buf->handle;
    566     disp.framebufferTarget->handle = disp.fbTargetHandle;
    567     disp.framebufferTarget->acquireFenceFd = acquireFenceFd;
    568     return NO_ERROR;
    569 }
    570 
    571 status_t HWComposer::prepare() {
    572     for (size_t i=0 ; i<mNumDisplays ; i++) {
    573         DisplayData& disp(mDisplayData[i]);
    574         if (disp.framebufferTarget) {
    575             // make sure to reset the type to HWC_FRAMEBUFFER_TARGET
    576             // DO NOT reset the handle field to NULL, because it's possible
    577             // that we have nothing to redraw (eg: eglSwapBuffers() not called)
    578             // in which case, we should continue to use the same buffer.
    579             LOG_FATAL_IF(disp.list == NULL);
    580             disp.framebufferTarget->compositionType = HWC_FRAMEBUFFER_TARGET;
    581         }
    582         if (!disp.connected && disp.list != NULL) {
    583             ALOGW("WARNING: disp %d: connected, non-null list, layers=%d",
    584                   i, disp.list->numHwLayers);
    585         }
    586         mLists[i] = disp.list;
    587         if (mLists[i]) {
    588             if (hwcHasApiVersion(mHwc, HWC_DEVICE_API_VERSION_1_EXP)) {
    589                 mLists[i]->outbuf = NULL;
    590                 mLists[i]->outbufAcquireFenceFd = -1;
    591             } else if (hwcHasApiVersion(mHwc, HWC_DEVICE_API_VERSION_1_1)) {
    592                 // garbage data to catch improper use
    593                 mLists[i]->dpy = (hwc_display_t)0xDEADBEEF;
    594                 mLists[i]->sur = (hwc_surface_t)0xDEADBEEF;
    595             } else {
    596                 mLists[i]->dpy = EGL_NO_DISPLAY;
    597                 mLists[i]->sur = EGL_NO_SURFACE;
    598             }
    599         }
    600     }
    601 
    602     int err = mHwc->prepare(mHwc, mNumDisplays, mLists);
    603     ALOGE_IF(err, "HWComposer: prepare failed (%s)", strerror(-err));
    604 
    605     if (err == NO_ERROR) {
    606         // here we're just making sure that "skip" layers are set
    607         // to HWC_FRAMEBUFFER and we're also counting how many layers
    608         // we have of each type.
    609         for (size_t i=0 ; i<mNumDisplays ; i++) {
    610             DisplayData& disp(mDisplayData[i]);
    611             disp.hasFbComp = false;
    612             disp.hasOvComp = false;
    613             if (disp.list) {
    614                 for (size_t i=0 ; i<disp.list->numHwLayers ; i++) {
    615                     hwc_layer_1_t& l = disp.list->hwLayers[i];
    616 
    617                     //ALOGD("prepare: %d, type=%d, handle=%p",
    618                     //        i, l.compositionType, l.handle);
    619 
    620                     if (l.flags & HWC_SKIP_LAYER) {
    621                         l.compositionType = HWC_FRAMEBUFFER;
    622                     }
    623                     if (l.compositionType == HWC_FRAMEBUFFER) {
    624                         disp.hasFbComp = true;
    625                     }
    626                     if (l.compositionType == HWC_OVERLAY) {
    627                         disp.hasOvComp = true;
    628                     }
    629                 }
    630             }
    631         }
    632     }
    633     return (status_t)err;
    634 }
    635 
    636 bool HWComposer::hasHwcComposition(int32_t id) const {
    637     if (!mHwc || uint32_t(id)>31 || !mAllocatedDisplayIDs.hasBit(id))
    638         return false;
    639     return mDisplayData[id].hasOvComp;
    640 }
    641 
    642 bool HWComposer::hasGlesComposition(int32_t id) const {
    643     if (!mHwc || uint32_t(id)>31 || !mAllocatedDisplayIDs.hasBit(id))
    644         return true;
    645     return mDisplayData[id].hasFbComp;
    646 }
    647 
    648 sp<Fence> HWComposer::getAndResetReleaseFence(int32_t id) {
    649     if (uint32_t(id)>31 || !mAllocatedDisplayIDs.hasBit(id))
    650         return Fence::NO_FENCE;
    651 
    652     int fd = INVALID_OPERATION;
    653     if (mHwc && hwcHasApiVersion(mHwc, HWC_DEVICE_API_VERSION_1_1)) {
    654         const DisplayData& disp(mDisplayData[id]);
    655         if (disp.framebufferTarget) {
    656             fd = disp.framebufferTarget->releaseFenceFd;
    657             disp.framebufferTarget->acquireFenceFd = -1;
    658             disp.framebufferTarget->releaseFenceFd = -1;
    659         }
    660     }
    661     return fd >= 0 ? new Fence(fd) : Fence::NO_FENCE;
    662 }
    663 
    664 status_t HWComposer::commit() {
    665     int err = NO_ERROR;
    666     if (mHwc) {
    667         if (!hwcHasApiVersion(mHwc, HWC_DEVICE_API_VERSION_1_1)) {
    668             // On version 1.0, the OpenGL ES target surface is communicated
    669             // by the (dpy, sur) fields and we are guaranteed to have only
    670             // a single display.
    671             mLists[0]->dpy = eglGetCurrentDisplay();
    672             mLists[0]->sur = eglGetCurrentSurface(EGL_DRAW);
    673         }
    674 
    675         for (size_t i=VIRTUAL_DISPLAY_ID_BASE; i<mNumDisplays; i++) {
    676             DisplayData& disp(mDisplayData[i]);
    677             if (disp.outbufHandle) {
    678                 mLists[i]->outbuf = disp.outbufHandle;
    679                 mLists[i]->outbufAcquireFenceFd =
    680                         disp.outbufAcquireFence->dup();
    681             }
    682         }
    683 
    684         err = mHwc->set(mHwc, mNumDisplays, mLists);
    685 
    686         for (size_t i=0 ; i<mNumDisplays ; i++) {
    687             DisplayData& disp(mDisplayData[i]);
    688             disp.lastDisplayFence = disp.lastRetireFence;
    689             disp.lastRetireFence = Fence::NO_FENCE;
    690             if (disp.list) {
    691                 if (disp.list->retireFenceFd != -1) {
    692                     disp.lastRetireFence = new Fence(disp.list->retireFenceFd);
    693                     disp.list->retireFenceFd = -1;
    694                 }
    695                 disp.list->flags &= ~HWC_GEOMETRY_CHANGED;
    696             }
    697         }
    698     }
    699     return (status_t)err;
    700 }
    701 
    702 status_t HWComposer::release(int disp) {
    703     LOG_FATAL_IF(disp >= VIRTUAL_DISPLAY_ID_BASE);
    704     if (mHwc) {
    705         eventControl(disp, HWC_EVENT_VSYNC, 0);
    706         return (status_t)mHwc->blank(mHwc, disp, 1);
    707     }
    708     return NO_ERROR;
    709 }
    710 
    711 status_t HWComposer::acquire(int disp) {
    712     LOG_FATAL_IF(disp >= VIRTUAL_DISPLAY_ID_BASE);
    713     if (mHwc) {
    714         return (status_t)mHwc->blank(mHwc, disp, 0);
    715     }
    716     return NO_ERROR;
    717 }
    718 
    719 void HWComposer::disconnectDisplay(int disp) {
    720     LOG_ALWAYS_FATAL_IF(disp < 0 || disp == HWC_DISPLAY_PRIMARY);
    721     DisplayData& dd(mDisplayData[disp]);
    722     free(dd.list);
    723     dd.list = NULL;
    724     dd.framebufferTarget = NULL;    // points into dd.list
    725     dd.fbTargetHandle = NULL;
    726     dd.outbufHandle = NULL;
    727     dd.lastRetireFence = Fence::NO_FENCE;
    728     dd.lastDisplayFence = Fence::NO_FENCE;
    729     dd.outbufAcquireFence = Fence::NO_FENCE;
    730 }
    731 
    732 int HWComposer::getVisualID() const {
    733     if (mHwc && hwcHasApiVersion(mHwc, HWC_DEVICE_API_VERSION_1_1)) {
    734         // FIXME: temporary hack until HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED
    735         // is supported by the implementation. we can only be in this case
    736         // if we have HWC 1.1
    737         return HAL_PIXEL_FORMAT_RGBA_8888;
    738         //return HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED;
    739     } else {
    740         return mFbDev->format;
    741     }
    742 }
    743 
    744 bool HWComposer::supportsFramebufferTarget() const {
    745     return (mHwc && hwcHasApiVersion(mHwc, HWC_DEVICE_API_VERSION_1_1));
    746 }
    747 
    748 int HWComposer::fbPost(int32_t id,
    749         const sp<Fence>& acquireFence, const sp<GraphicBuffer>& buffer) {
    750     if (mHwc && hwcHasApiVersion(mHwc, HWC_DEVICE_API_VERSION_1_1)) {
    751         return setFramebufferTarget(id, acquireFence, buffer);
    752     } else {
    753         acquireFence->waitForever("HWComposer::fbPost");
    754         return mFbDev->post(mFbDev, buffer->handle);
    755     }
    756 }
    757 
    758 int HWComposer::fbCompositionComplete() {
    759     if (mHwc && hwcHasApiVersion(mHwc, HWC_DEVICE_API_VERSION_1_1))
    760         return NO_ERROR;
    761 
    762     if (mFbDev->compositionComplete) {
    763         return mFbDev->compositionComplete(mFbDev);
    764     } else {
    765         return INVALID_OPERATION;
    766     }
    767 }
    768 
    769 void HWComposer::fbDump(String8& result) {
    770     if (mFbDev && mFbDev->common.version >= 1 && mFbDev->dump) {
    771         const size_t SIZE = 4096;
    772         char buffer[SIZE];
    773         mFbDev->dump(mFbDev, buffer, SIZE);
    774         result.append(buffer);
    775     }
    776 }
    777 
    778 status_t HWComposer::setOutputBuffer(int32_t id, const sp<Fence>& acquireFence,
    779         const sp<GraphicBuffer>& buf) {
    780     if (uint32_t(id)>31 || !mAllocatedDisplayIDs.hasBit(id))
    781         return BAD_INDEX;
    782     if (id < VIRTUAL_DISPLAY_ID_BASE)
    783         return INVALID_OPERATION;
    784 
    785     DisplayData& disp(mDisplayData[id]);
    786     disp.outbufHandle = buf->handle;
    787     disp.outbufAcquireFence = acquireFence;
    788     return NO_ERROR;
    789 }
    790 
    791 sp<Fence> HWComposer::getLastRetireFence(int32_t id) {
    792     if (uint32_t(id)>31 || !mAllocatedDisplayIDs.hasBit(id))
    793         return Fence::NO_FENCE;
    794     return mDisplayData[id].lastRetireFence;
    795 }
    796 
    797 /*
    798  * Helper template to implement a concrete HWCLayer
    799  * This holds the pointer to the concrete hwc layer type
    800  * and implements the "iterable" side of HWCLayer.
    801  */
    802 template<typename CONCRETE, typename HWCTYPE>
    803 class Iterable : public HWComposer::HWCLayer {
    804 protected:
    805     HWCTYPE* const mLayerList;
    806     HWCTYPE* mCurrentLayer;
    807     Iterable(HWCTYPE* layer) : mLayerList(layer), mCurrentLayer(layer) { }
    808     inline HWCTYPE const * getLayer() const { return mCurrentLayer; }
    809     inline HWCTYPE* getLayer() { return mCurrentLayer; }
    810     virtual ~Iterable() { }
    811 private:
    812     // returns a copy of ourselves
    813     virtual HWComposer::HWCLayer* dup() {
    814         return new CONCRETE( static_cast<const CONCRETE&>(*this) );
    815     }
    816     virtual status_t setLayer(size_t index) {
    817         mCurrentLayer = &mLayerList[index];
    818         return NO_ERROR;
    819     }
    820 };
    821 
    822 /*
    823  * Concrete implementation of HWCLayer for HWC_DEVICE_API_VERSION_1_0.
    824  * This implements the HWCLayer side of HWCIterableLayer.
    825  */
    826 class HWCLayerVersion1 : public Iterable<HWCLayerVersion1, hwc_layer_1_t> {
    827     struct hwc_composer_device_1* mHwc;
    828 public:
    829     HWCLayerVersion1(struct hwc_composer_device_1* hwc, hwc_layer_1_t* layer)
    830         : Iterable<HWCLayerVersion1, hwc_layer_1_t>(layer), mHwc(hwc) { }
    831 
    832     virtual int32_t getCompositionType() const {
    833         return getLayer()->compositionType;
    834     }
    835     virtual uint32_t getHints() const {
    836         return getLayer()->hints;
    837     }
    838     virtual sp<Fence> getAndResetReleaseFence() {
    839         int fd = getLayer()->releaseFenceFd;
    840         getLayer()->releaseFenceFd = -1;
    841         return fd >= 0 ? new Fence(fd) : Fence::NO_FENCE;
    842     }
    843     virtual void setAcquireFenceFd(int fenceFd) {
    844         getLayer()->acquireFenceFd = fenceFd;
    845     }
    846     virtual void setPerFrameDefaultState() {
    847         //getLayer()->compositionType = HWC_FRAMEBUFFER;
    848     }
    849     virtual void setPlaneAlpha(uint8_t alpha) {
    850         if (hwcHasApiVersion(mHwc, HWC_DEVICE_API_VERSION_1_2)) {
    851             getLayer()->planeAlpha = alpha;
    852         } else {
    853             if (alpha < 0xFF) {
    854                 getLayer()->flags |= HWC_SKIP_LAYER;
    855             }
    856         }
    857     }
    858     virtual void setDefaultState() {
    859         hwc_layer_1_t* const l = getLayer();
    860         l->compositionType = HWC_FRAMEBUFFER;
    861         l->hints = 0;
    862         l->flags = HWC_SKIP_LAYER;
    863         l->handle = 0;
    864         l->transform = 0;
    865         l->blending = HWC_BLENDING_NONE;
    866         l->visibleRegionScreen.numRects = 0;
    867         l->visibleRegionScreen.rects = NULL;
    868         l->acquireFenceFd = -1;
    869         l->releaseFenceFd = -1;
    870         l->planeAlpha = 0xFF;
    871     }
    872     virtual void setSkip(bool skip) {
    873         if (skip) {
    874             getLayer()->flags |= HWC_SKIP_LAYER;
    875         } else {
    876             getLayer()->flags &= ~HWC_SKIP_LAYER;
    877         }
    878     }
    879     virtual void setBlending(uint32_t blending) {
    880         getLayer()->blending = blending;
    881     }
    882     virtual void setTransform(uint32_t transform) {
    883         getLayer()->transform = transform;
    884     }
    885     virtual void setFrame(const Rect& frame) {
    886         reinterpret_cast<Rect&>(getLayer()->displayFrame) = frame;
    887     }
    888     virtual void setCrop(const Rect& crop) {
    889         reinterpret_cast<Rect&>(getLayer()->sourceCrop) = crop;
    890     }
    891     virtual void setVisibleRegionScreen(const Region& reg) {
    892         // Region::getSharedBuffer creates a reference to the underlying
    893         // SharedBuffer of this Region, this reference is freed
    894         // in onDisplayed()
    895         hwc_region_t& visibleRegion = getLayer()->visibleRegionScreen;
    896         SharedBuffer const* sb = reg.getSharedBuffer(&visibleRegion.numRects);
    897         visibleRegion.rects = reinterpret_cast<hwc_rect_t const *>(sb->data());
    898     }
    899     virtual void setBuffer(const sp<GraphicBuffer>& buffer) {
    900         if (buffer == 0 || buffer->handle == 0) {
    901             getLayer()->compositionType = HWC_FRAMEBUFFER;
    902             getLayer()->flags |= HWC_SKIP_LAYER;
    903             getLayer()->handle = 0;
    904         } else {
    905             getLayer()->handle = buffer->handle;
    906         }
    907     }
    908     virtual void onDisplayed() {
    909         hwc_region_t& visibleRegion = getLayer()->visibleRegionScreen;
    910         SharedBuffer const* sb = SharedBuffer::bufferFromData(visibleRegion.rects);
    911         if (sb) {
    912             sb->release();
    913             // not technically needed but safer
    914             visibleRegion.numRects = 0;
    915             visibleRegion.rects = NULL;
    916         }
    917 
    918         getLayer()->acquireFenceFd = -1;
    919     }
    920 };
    921 
    922 /*
    923  * returns an iterator initialized at a given index in the layer list
    924  */
    925 HWComposer::LayerListIterator HWComposer::getLayerIterator(int32_t id, size_t index) {
    926     if (uint32_t(id)>31 || !mAllocatedDisplayIDs.hasBit(id)) {
    927         return LayerListIterator();
    928     }
    929     const DisplayData& disp(mDisplayData[id]);
    930     if (!mHwc || !disp.list || index > disp.list->numHwLayers) {
    931         return LayerListIterator();
    932     }
    933     return LayerListIterator(new HWCLayerVersion1(mHwc, disp.list->hwLayers), index);
    934 }
    935 
    936 /*
    937  * returns an iterator on the beginning of the layer list
    938  */
    939 HWComposer::LayerListIterator HWComposer::begin(int32_t id) {
    940     return getLayerIterator(id, 0);
    941 }
    942 
    943 /*
    944  * returns an iterator on the end of the layer list
    945  */
    946 HWComposer::LayerListIterator HWComposer::end(int32_t id) {
    947     size_t numLayers = 0;
    948     if (uint32_t(id) <= 31 && mAllocatedDisplayIDs.hasBit(id)) {
    949         const DisplayData& disp(mDisplayData[id]);
    950         if (mHwc && disp.list) {
    951             numLayers = disp.list->numHwLayers;
    952             if (hwcHasApiVersion(mHwc, HWC_DEVICE_API_VERSION_1_1)) {
    953                 // with HWC 1.1, the last layer is always the HWC_FRAMEBUFFER_TARGET,
    954                 // which we ignore when iterating through the layer list.
    955                 ALOGE_IF(!numLayers, "mDisplayData[%d].list->numHwLayers is 0", id);
    956                 if (numLayers) {
    957                     numLayers--;
    958                 }
    959             }
    960         }
    961     }
    962     return getLayerIterator(id, numLayers);
    963 }
    964 
    965 void HWComposer::dump(String8& result, char* buffer, size_t SIZE) const {
    966     if (mHwc) {
    967         result.appendFormat("Hardware Composer state (version %8x):\n", hwcApiVersion(mHwc));
    968         result.appendFormat("  mDebugForceFakeVSync=%d\n", mDebugForceFakeVSync);
    969         for (size_t i=0 ; i<mNumDisplays ; i++) {
    970             const DisplayData& disp(mDisplayData[i]);
    971             if (!disp.connected)
    972                 continue;
    973 
    974             const Vector< sp<Layer> >& visibleLayersSortedByZ =
    975                     mFlinger->getLayerSortedByZForHwcDisplay(i);
    976 
    977             result.appendFormat(
    978                     "  Display[%d] : %ux%u, xdpi=%f, ydpi=%f, refresh=%lld\n",
    979                     i, disp.width, disp.height, disp.xdpi, disp.ydpi, disp.refresh);
    980 
    981             if (disp.list) {
    982                 result.appendFormat(
    983                         "  numHwLayers=%u, flags=%08x\n",
    984                         disp.list->numHwLayers, disp.list->flags);
    985 
    986                 result.append(
    987                         "    type    |  handle  |   hints  |   flags  | tr | blend |  format  |       source crop         |           frame           name \n"
    988                         "------------+----------+----------+----------+----+-------+----------+---------------------------+--------------------------------\n");
    989                 //      " __________ | ________ | ________ | ________ | __ | _____ | ________ | [_____,_____,_____,_____] | [_____,_____,_____,_____]
    990                 for (size_t i=0 ; i<disp.list->numHwLayers ; i++) {
    991                     const hwc_layer_1_t&l = disp.list->hwLayers[i];
    992                     int32_t format = -1;
    993                     String8 name("unknown");
    994 
    995                     if (i < visibleLayersSortedByZ.size()) {
    996                         const sp<Layer>& layer(visibleLayersSortedByZ[i]);
    997                         const sp<GraphicBuffer>& buffer(
    998                                 layer->getActiveBuffer());
    999                         if (buffer != NULL) {
   1000                             format = buffer->getPixelFormat();
   1001                         }
   1002                         name = layer->getName();
   1003                     }
   1004 
   1005                     int type = l.compositionType;
   1006                     if (type == HWC_FRAMEBUFFER_TARGET) {
   1007                         name = "HWC_FRAMEBUFFER_TARGET";
   1008                         format = disp.format;
   1009                     }
   1010 
   1011                     static char const* compositionTypeName[] = {
   1012                             "GLES",
   1013                             "HWC",
   1014                             "BACKGROUND",
   1015                             "FB TARGET",
   1016                             "UNKNOWN"};
   1017                     if (type >= NELEM(compositionTypeName))
   1018                         type = NELEM(compositionTypeName) - 1;
   1019 
   1020                     result.appendFormat(
   1021                             " %10s | %08x | %08x | %08x | %02x | %05x | %08x | [%5d,%5d,%5d,%5d] | [%5d,%5d,%5d,%5d] %s\n",
   1022                                     compositionTypeName[type],
   1023                                     intptr_t(l.handle), l.hints, l.flags, l.transform, l.blending, format,
   1024                                     l.sourceCrop.left, l.sourceCrop.top, l.sourceCrop.right, l.sourceCrop.bottom,
   1025                                     l.displayFrame.left, l.displayFrame.top, l.displayFrame.right, l.displayFrame.bottom,
   1026                                     name.string());
   1027                 }
   1028             }
   1029         }
   1030     }
   1031 
   1032     if (mHwc && mHwc->dump) {
   1033         mHwc->dump(mHwc, buffer, SIZE);
   1034         result.append(buffer);
   1035     }
   1036 }
   1037 
   1038 // ---------------------------------------------------------------------------
   1039 
   1040 HWComposer::VSyncThread::VSyncThread(HWComposer& hwc)
   1041     : mHwc(hwc), mEnabled(false),
   1042       mNextFakeVSync(0),
   1043       mRefreshPeriod(hwc.getRefreshPeriod(HWC_DISPLAY_PRIMARY))
   1044 {
   1045 }
   1046 
   1047 void HWComposer::VSyncThread::setEnabled(bool enabled) {
   1048     Mutex::Autolock _l(mLock);
   1049     if (mEnabled != enabled) {
   1050         mEnabled = enabled;
   1051         mCondition.signal();
   1052     }
   1053 }
   1054 
   1055 void HWComposer::VSyncThread::onFirstRef() {
   1056     run("VSyncThread", PRIORITY_URGENT_DISPLAY + PRIORITY_MORE_FAVORABLE);
   1057 }
   1058 
   1059 bool HWComposer::VSyncThread::threadLoop() {
   1060     { // scope for lock
   1061         Mutex::Autolock _l(mLock);
   1062         while (!mEnabled) {
   1063             mCondition.wait(mLock);
   1064         }
   1065     }
   1066 
   1067     const nsecs_t period = mRefreshPeriod;
   1068     const nsecs_t now = systemTime(CLOCK_MONOTONIC);
   1069     nsecs_t next_vsync = mNextFakeVSync;
   1070     nsecs_t sleep = next_vsync - now;
   1071     if (sleep < 0) {
   1072         // we missed, find where the next vsync should be
   1073         sleep = (period - ((now - next_vsync) % period));
   1074         next_vsync = now + sleep;
   1075     }
   1076     mNextFakeVSync = next_vsync + period;
   1077 
   1078     struct timespec spec;
   1079     spec.tv_sec  = next_vsync / 1000000000;
   1080     spec.tv_nsec = next_vsync % 1000000000;
   1081 
   1082     int err;
   1083     do {
   1084         err = clock_nanosleep(CLOCK_MONOTONIC, TIMER_ABSTIME, &spec, NULL);
   1085     } while (err<0 && errno == EINTR);
   1086 
   1087     if (err == 0) {
   1088         mHwc.mEventHandler.onVSyncReceived(0, next_vsync);
   1089     }
   1090 
   1091     return true;
   1092 }
   1093 
   1094 HWComposer::DisplayData::DisplayData()
   1095 :   width(0), height(0), format(0),
   1096     xdpi(0.0f), ydpi(0.0f),
   1097     refresh(0),
   1098     connected(false),
   1099     hasFbComp(false), hasOvComp(false),
   1100     capacity(0), list(NULL),
   1101     framebufferTarget(NULL), fbTargetHandle(0),
   1102     lastRetireFence(Fence::NO_FENCE), lastDisplayFence(Fence::NO_FENCE),
   1103     outbufHandle(NULL), outbufAcquireFence(Fence::NO_FENCE),
   1104     events(0)
   1105 {}
   1106 
   1107 HWComposer::DisplayData::~DisplayData() {
   1108     free(list);
   1109 }
   1110 
   1111 // ---------------------------------------------------------------------------
   1112 }; // namespace android
   1113