SurfaceFlinger.cpp revision 9ca48916bc9408d0f3f8ac95469ced0a6a342aca 
1/*
2 * Copyright (C) 2007 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#include <stdint.h>
20#include <sys/types.h>
21#include <errno.h>
22#include <math.h>
23
24#include <EGL/egl.h>
25#include <GLES/gl.h>
26
27#include <cutils/log.h>
28#include <cutils/properties.h>
29
30#include <binder/IPCThreadState.h>
31#include <binder/IServiceManager.h>
32#include <binder/MemoryHeapBase.h>
33#include <binder/PermissionCache.h>
34
35#include <ui/DisplayInfo.h>
36
37#include <gui/BitTube.h>
38#include <gui/BufferQueue.h>
39#include <gui/IDisplayEventConnection.h>
40#include <gui/SurfaceTextureClient.h>
41
42#include <ui/GraphicBufferAllocator.h>
43#include <ui/PixelFormat.h>
44
45#include <utils/String8.h>
46#include <utils/String16.h>
47#include <utils/StopWatch.h>
48#include <utils/Trace.h>
49
50#include <private/android_filesystem_config.h>
51
52#include "clz.h"
53#include "DdmConnection.h"
54#include "DisplayDevice.h"
55#include "Client.h"
56#include "EventThread.h"
57#include "GLExtensions.h"
58#include "Layer.h"
59#include "LayerDim.h"
60#include "LayerScreenshot.h"
61#include "SurfaceFlinger.h"
62
63#include "DisplayHardware/FramebufferSurface.h"
64#include "DisplayHardware/HWComposer.h"
65
66
67#define EGL_VERSION_HW_ANDROID  0x3143
68
69#define DISPLAY_COUNT       1
70
71namespace android {
72// ---------------------------------------------------------------------------
73
74const String16 sHardwareTest("android.permission.HARDWARE_TEST");
75const String16 sAccessSurfaceFlinger("android.permission.ACCESS_SURFACE_FLINGER");
76const String16 sReadFramebuffer("android.permission.READ_FRAME_BUFFER");
77const String16 sDump("android.permission.DUMP");
78
79// ---------------------------------------------------------------------------
80
81SurfaceFlinger::SurfaceFlinger()
82    :   BnSurfaceComposer(), Thread(false),
83        mTransactionFlags(0),
84        mTransationPending(false),
85        mLayersRemoved(false),
86        mRepaintEverything(0),
87        mBootTime(systemTime()),
88        mVisibleRegionsDirty(false),
89        mHwWorkListDirty(false),
90        mDebugRegion(0),
91        mDebugDDMS(0),
92        mDebugDisableHWC(0),
93        mDebugDisableTransformHint(0),
94        mDebugInSwapBuffers(0),
95        mLastSwapBufferTime(0),
96        mDebugInTransaction(0),
97        mLastTransactionTime(0),
98        mBootFinished(false)
99{
100    ALOGI("SurfaceFlinger is starting");
101
102    // debugging stuff...
103    char value[PROPERTY_VALUE_MAX];
104
105    property_get("debug.sf.showupdates", value, "0");
106    mDebugRegion = atoi(value);
107
108    property_get("debug.sf.ddms", value, "0");
109    mDebugDDMS = atoi(value);
110    if (mDebugDDMS) {
111        DdmConnection::start(getServiceName());
112    }
113
114    ALOGI_IF(mDebugRegion, "showupdates enabled");
115    ALOGI_IF(mDebugDDMS, "DDMS debugging enabled");
116}
117
118void SurfaceFlinger::onFirstRef()
119{
120    mEventQueue.init(this);
121
122    run("SurfaceFlinger", PRIORITY_URGENT_DISPLAY);
123
124    // Wait for the main thread to be done with its initialization
125    mReadyToRunBarrier.wait();
126}
127
128
129SurfaceFlinger::~SurfaceFlinger()
130{
131    EGLDisplay display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
132    eglMakeCurrent(display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
133    eglTerminate(display);
134}
135
136void SurfaceFlinger::binderDied(const wp<IBinder>& who)
137{
138    // the window manager died on us. prepare its eulogy.
139
140    // restore initial conditions (default device unblank, etc)
141    initializeDisplays();
142
143    // restart the boot-animation
144    startBootAnim();
145}
146
147sp<ISurfaceComposerClient> SurfaceFlinger::createConnection()
148{
149    sp<ISurfaceComposerClient> bclient;
150    sp<Client> client(new Client(this));
151    status_t err = client->initCheck();
152    if (err == NO_ERROR) {
153        bclient = client;
154    }
155    return bclient;
156}
157
158sp<IBinder> SurfaceFlinger::createDisplay()
159{
160    class DisplayToken : public BBinder {
161        sp<SurfaceFlinger> flinger;
162        virtual ~DisplayToken() {
163             // no more references, this display must be terminated
164             Mutex::Autolock _l(flinger->mStateLock);
165             flinger->mCurrentState.displays.removeItem(this);
166             flinger->setTransactionFlags(eDisplayTransactionNeeded);
167         }
168     public:
169        DisplayToken(const sp<SurfaceFlinger>& flinger)
170            : flinger(flinger) {
171        }
172    };
173
174    sp<BBinder> token = new DisplayToken(this);
175
176    Mutex::Autolock _l(mStateLock);
177    DisplayDeviceState info(DisplayDevice::DISPLAY_VIRTUAL);
178    mCurrentState.displays.add(token, info);
179
180    return token;
181}
182
183sp<IBinder> SurfaceFlinger::getBuiltInDisplay(int32_t id) {
184    if (uint32_t(id) >= DisplayDevice::NUM_DISPLAY_TYPES) {
185        ALOGE("getDefaultDisplay: id=%d is not a valid default display id", id);
186        return NULL;
187    }
188    return mDefaultDisplays[id];
189}
190
191sp<IGraphicBufferAlloc> SurfaceFlinger::createGraphicBufferAlloc()
192{
193    sp<GraphicBufferAlloc> gba(new GraphicBufferAlloc());
194    return gba;
195}
196
197void SurfaceFlinger::bootFinished()
198{
199    const nsecs_t now = systemTime();
200    const nsecs_t duration = now - mBootTime;
201    ALOGI("Boot is finished (%ld ms)", long(ns2ms(duration)) );
202    mBootFinished = true;
203
204    // wait patiently for the window manager death
205    const String16 name("window");
206    sp<IBinder> window(defaultServiceManager()->getService(name));
207    if (window != 0) {
208        window->linkToDeath(static_cast<IBinder::DeathRecipient*>(this));
209    }
210
211    // stop boot animation
212    // formerly we would just kill the process, but we now ask it to exit so it
213    // can choose where to stop the animation.
214    property_set("service.bootanim.exit", "1");
215}
216
217void SurfaceFlinger::deleteTextureAsync(GLuint texture) {
218    class MessageDestroyGLTexture : public MessageBase {
219        GLuint texture;
220    public:
221        MessageDestroyGLTexture(GLuint texture)
222            : texture(texture) {
223        }
224        virtual bool handler() {
225            glDeleteTextures(1, &texture);
226            return true;
227        }
228    };
229    postMessageAsync(new MessageDestroyGLTexture(texture));
230}
231
232status_t SurfaceFlinger::selectConfigForPixelFormat(
233        EGLDisplay dpy,
234        EGLint const* attrs,
235        PixelFormat format,
236        EGLConfig* outConfig)
237{
238    EGLConfig config = NULL;
239    EGLint numConfigs = -1, n=0;
240    eglGetConfigs(dpy, NULL, 0, &numConfigs);
241    EGLConfig* const configs = new EGLConfig[numConfigs];
242    eglChooseConfig(dpy, attrs, configs, numConfigs, &n);
243    for (int i=0 ; i<n ; i++) {
244        EGLint nativeVisualId = 0;
245        eglGetConfigAttrib(dpy, configs[i], EGL_NATIVE_VISUAL_ID, &nativeVisualId);
246        if (nativeVisualId>0 && format == nativeVisualId) {
247            *outConfig = configs[i];
248            delete [] configs;
249            return NO_ERROR;
250        }
251    }
252    delete [] configs;
253    return NAME_NOT_FOUND;
254}
255
256EGLConfig SurfaceFlinger::selectEGLConfig(EGLDisplay display, EGLint nativeVisualId) {
257    // select our EGLConfig. It must support EGL_RECORDABLE_ANDROID if
258    // it is to be used with WIFI displays
259    EGLConfig config;
260    EGLint dummy;
261    status_t err;
262    EGLint attribs[] = {
263            EGL_SURFACE_TYPE,           EGL_WINDOW_BIT,
264            EGL_RECORDABLE_ANDROID,     EGL_TRUE,
265            EGL_NONE
266    };
267    err = selectConfigForPixelFormat(display, attribs, nativeVisualId, &config);
268    if (err) {
269        // maybe we failed because of EGL_RECORDABLE_ANDROID
270        ALOGW("couldn't find an EGLConfig with EGL_RECORDABLE_ANDROID");
271        attribs[2] = EGL_NONE;
272        err = selectConfigForPixelFormat(display, attribs, nativeVisualId, &config);
273    }
274    ALOGE_IF(err, "couldn't find an EGLConfig matching the screen format");
275    if (eglGetConfigAttrib(display, config, EGL_CONFIG_CAVEAT, &dummy) == EGL_TRUE) {
276        ALOGW_IF(dummy == EGL_SLOW_CONFIG, "EGL_SLOW_CONFIG selected!");
277    }
278    return config;
279}
280
281EGLContext SurfaceFlinger::createGLContext(EGLDisplay display, EGLConfig config) {
282    // Also create our EGLContext
283    EGLint contextAttributes[] = {
284#ifdef EGL_IMG_context_priority
285#ifdef HAS_CONTEXT_PRIORITY
286#warning "using EGL_IMG_context_priority"
287            EGL_CONTEXT_PRIORITY_LEVEL_IMG, EGL_CONTEXT_PRIORITY_HIGH_IMG,
288#endif
289#endif
290            EGL_NONE, EGL_NONE
291    };
292    EGLContext ctxt = eglCreateContext(display, config, NULL, contextAttributes);
293    ALOGE_IF(ctxt==EGL_NO_CONTEXT, "EGLContext creation failed");
294    return ctxt;
295}
296
297void SurfaceFlinger::initializeGL(EGLDisplay display, EGLSurface surface) {
298    EGLBoolean result = eglMakeCurrent(display, surface, surface, mEGLContext);
299    if (!result) {
300        ALOGE("Couldn't create a working GLES context. check logs. exiting...");
301        exit(0);
302    }
303
304    GLExtensions& extensions(GLExtensions::getInstance());
305    extensions.initWithGLStrings(
306            glGetString(GL_VENDOR),
307            glGetString(GL_RENDERER),
308            glGetString(GL_VERSION),
309            glGetString(GL_EXTENSIONS),
310            eglQueryString(display, EGL_VENDOR),
311            eglQueryString(display, EGL_VERSION),
312            eglQueryString(display, EGL_EXTENSIONS));
313
314    EGLint w, h;
315    eglQuerySurface(display, surface, EGL_WIDTH,  &w);
316    eglQuerySurface(display, surface, EGL_HEIGHT, &h);
317
318    glGetIntegerv(GL_MAX_TEXTURE_SIZE, &mMaxTextureSize);
319    glGetIntegerv(GL_MAX_VIEWPORT_DIMS, mMaxViewportDims);
320
321    glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
322    glPixelStorei(GL_PACK_ALIGNMENT, 4);
323    glEnableClientState(GL_VERTEX_ARRAY);
324    glShadeModel(GL_FLAT);
325    glDisable(GL_DITHER);
326    glDisable(GL_CULL_FACE);
327
328    struct pack565 {
329        inline uint16_t operator() (int r, int g, int b) const {
330            return (r<<11)|(g<<5)|b;
331        }
332    } pack565;
333
334    const uint16_t protTexData[] = { pack565(0x03, 0x03, 0x03) };
335    glGenTextures(1, &mProtectedTexName);
336    glBindTexture(GL_TEXTURE_2D, mProtectedTexName);
337    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
338    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
339    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
340    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
341    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 1, 1, 0,
342            GL_RGB, GL_UNSIGNED_SHORT_5_6_5, protTexData);
343
344    glViewport(0, 0, w, h);
345    glMatrixMode(GL_PROJECTION);
346    glLoadIdentity();
347    // put the origin in the left-bottom corner
348    glOrthof(0, w, 0, h, 0, 1); // l=0, r=w ; b=0, t=h
349
350    // print some debugging info
351    EGLint r,g,b,a;
352    eglGetConfigAttrib(display, mEGLConfig, EGL_RED_SIZE,   &r);
353    eglGetConfigAttrib(display, mEGLConfig, EGL_GREEN_SIZE, &g);
354    eglGetConfigAttrib(display, mEGLConfig, EGL_BLUE_SIZE,  &b);
355    eglGetConfigAttrib(display, mEGLConfig, EGL_ALPHA_SIZE, &a);
356    ALOGI("EGL informations:");
357    ALOGI("vendor    : %s", extensions.getEglVendor());
358    ALOGI("version   : %s", extensions.getEglVersion());
359    ALOGI("extensions: %s", extensions.getEglExtension());
360    ALOGI("Client API: %s", eglQueryString(display, EGL_CLIENT_APIS)?:"Not Supported");
361    ALOGI("EGLSurface: %d-%d-%d-%d, config=%p", r, g, b, a, mEGLConfig);
362    ALOGI("OpenGL ES informations:");
363    ALOGI("vendor    : %s", extensions.getVendor());
364    ALOGI("renderer  : %s", extensions.getRenderer());
365    ALOGI("version   : %s", extensions.getVersion());
366    ALOGI("extensions: %s", extensions.getExtension());
367    ALOGI("GL_MAX_TEXTURE_SIZE = %d", mMaxTextureSize);
368    ALOGI("GL_MAX_VIEWPORT_DIMS = %d x %d", mMaxViewportDims[0], mMaxViewportDims[1]);
369}
370
371status_t SurfaceFlinger::readyToRun()
372{
373    ALOGI(  "SurfaceFlinger's main thread ready to run. "
374            "Initializing graphics H/W...");
375
376    // initialize EGL
377    mEGLDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY);
378    eglInitialize(mEGLDisplay, NULL, NULL);
379
380    // Initialize the main display
381    // create native window to main display
382    sp<FramebufferSurface> fbs = FramebufferSurface::create();
383    if (fbs == NULL) {
384        ALOGE("Display subsystem failed to initialize. check logs. exiting...");
385        exit(0);
386    }
387
388    sp<SurfaceTextureClient> stc(new SurfaceTextureClient(
389            static_cast<sp<ISurfaceTexture> >(fbs->getBufferQueue())));
390
391    // initialize the config and context
392    int format;
393    ANativeWindow* const anw = stc.get();
394    anw->query(anw, NATIVE_WINDOW_FORMAT, &format);
395    mEGLConfig  = selectEGLConfig(mEGLDisplay, format);
396    mEGLContext = createGLContext(mEGLDisplay, mEGLConfig);
397
398    // initialize our main display hardware
399
400    for (size_t i=0 ; i<DisplayDevice::NUM_DISPLAY_TYPES ; i++) {
401        mDefaultDisplays[i] = new BBinder();
402        mCurrentState.displays.add(mDefaultDisplays[i],
403                DisplayDeviceState((DisplayDevice::DisplayType)i));
404    }
405    sp<DisplayDevice> hw = new DisplayDevice(this,
406            DisplayDevice::DISPLAY_PRIMARY,
407            mDefaultDisplays[DisplayDevice::DISPLAY_PRIMARY],
408            anw, fbs, mEGLConfig);
409    mDisplays.add(mDefaultDisplays[DisplayDevice::DISPLAY_PRIMARY], hw);
410
411    //  initialize OpenGL ES
412    EGLSurface surface = hw->getEGLSurface();
413    initializeGL(mEGLDisplay, surface);
414
415    // start the EventThread
416    mEventThread = new EventThread(this);
417    mEventQueue.setEventThread(mEventThread);
418
419    // initialize the H/W composer
420    mHwc = new HWComposer(this,
421            *static_cast<HWComposer::EventHandler *>(this),
422            fbs->getFbHal());
423
424    // initialize our drawing state
425    mDrawingState = mCurrentState;
426
427    // We're now ready to accept clients...
428    mReadyToRunBarrier.open();
429
430    // set initial conditions (e.g. unblank default device)
431    initializeDisplays();
432
433    // start boot animation
434    startBootAnim();
435
436    return NO_ERROR;
437}
438
439int32_t SurfaceFlinger::allocateHwcDisplayId(DisplayDevice::DisplayType type) {
440    return (uint32_t(type) < DisplayDevice::NUM_DISPLAY_TYPES) ?
441            type : mHwc->allocateDisplayId();
442}
443
444void SurfaceFlinger::startBootAnim() {
445    // start boot animation
446    property_set("service.bootanim.exit", "0");
447    property_set("ctl.start", "bootanim");
448}
449
450uint32_t SurfaceFlinger::getMaxTextureSize() const {
451    return mMaxTextureSize;
452}
453
454uint32_t SurfaceFlinger::getMaxViewportDims() const {
455    return mMaxViewportDims[0] < mMaxViewportDims[1] ?
456            mMaxViewportDims[0] : mMaxViewportDims[1];
457}
458
459// ----------------------------------------------------------------------------
460
461bool SurfaceFlinger::authenticateSurfaceTexture(
462        const sp<ISurfaceTexture>& surfaceTexture) const {
463    Mutex::Autolock _l(mStateLock);
464    sp<IBinder> surfaceTextureBinder(surfaceTexture->asBinder());
465
466    // Check the visible layer list for the ISurface
467    const LayerVector& currentLayers = mCurrentState.layersSortedByZ;
468    size_t count = currentLayers.size();
469    for (size_t i=0 ; i<count ; i++) {
470        const sp<LayerBase>& layer(currentLayers[i]);
471        sp<LayerBaseClient> lbc(layer->getLayerBaseClient());
472        if (lbc != NULL) {
473            wp<IBinder> lbcBinder = lbc->getSurfaceTextureBinder();
474            if (lbcBinder == surfaceTextureBinder) {
475                return true;
476            }
477        }
478    }
479
480    // Check the layers in the purgatory.  This check is here so that if a
481    // SurfaceTexture gets destroyed before all the clients are done using it,
482    // the error will not be reported as "surface XYZ is not authenticated", but
483    // will instead fail later on when the client tries to use the surface,
484    // which should be reported as "surface XYZ returned an -ENODEV".  The
485    // purgatorized layers are no less authentic than the visible ones, so this
486    // should not cause any harm.
487    size_t purgatorySize =  mLayerPurgatory.size();
488    for (size_t i=0 ; i<purgatorySize ; i++) {
489        const sp<LayerBase>& layer(mLayerPurgatory.itemAt(i));
490        sp<LayerBaseClient> lbc(layer->getLayerBaseClient());
491        if (lbc != NULL) {
492            wp<IBinder> lbcBinder = lbc->getSurfaceTextureBinder();
493            if (lbcBinder == surfaceTextureBinder) {
494                return true;
495            }
496        }
497    }
498
499    return false;
500}
501
502status_t SurfaceFlinger::getDisplayInfo(const sp<IBinder>& display, DisplayInfo* info) {
503    // TODO: this is mostly here only for compatibility
504    //       the display size is needed but the display metrics should come from elsewhere
505    if (display != mDefaultDisplays[ISurfaceComposer::eDisplayIdMain]) {
506        // TODO: additional displays not yet supported
507        return BAD_INDEX;
508    }
509
510    const HWComposer& hwc(getHwComposer());
511    float xdpi = hwc.getDpiX();
512    float ydpi = hwc.getDpiY();
513
514    // TODO: Not sure if display density should handled by SF any longer
515    class Density {
516        static int getDensityFromProperty(char const* propName) {
517            char property[PROPERTY_VALUE_MAX];
518            int density = 0;
519            if (property_get(propName, property, NULL) > 0) {
520                density = atoi(property);
521            }
522            return density;
523        }
524    public:
525        static int getEmuDensity() {
526            return getDensityFromProperty("qemu.sf.lcd_density"); }
527        static int getBuildDensity()  {
528            return getDensityFromProperty("ro.sf.lcd_density"); }
529    };
530    // The density of the device is provided by a build property
531    float density = Density::getBuildDensity() / 160.0f;
532    if (density == 0) {
533        // the build doesn't provide a density -- this is wrong!
534        // use xdpi instead
535        ALOGE("ro.sf.lcd_density must be defined as a build property");
536        density = xdpi / 160.0f;
537    }
538    if (Density::getEmuDensity()) {
539        // if "qemu.sf.lcd_density" is specified, it overrides everything
540        xdpi = ydpi = density = Density::getEmuDensity();
541        density /= 160.0f;
542    }
543
544    sp<const DisplayDevice> hw(getDefaultDisplayDevice());
545    info->w = hw->getWidth();
546    info->h = hw->getHeight();
547    info->xdpi = xdpi;
548    info->ydpi = ydpi;
549    info->fps = float(1e9 / hwc.getRefreshPeriod());
550    info->density = density;
551    info->orientation = hw->getOrientation();
552    // TODO: this needs to go away (currently needed only by webkit)
553    getPixelFormatInfo(hw->getFormat(), &info->pixelFormatInfo);
554    return NO_ERROR;
555}
556
557// ----------------------------------------------------------------------------
558
559sp<IDisplayEventConnection> SurfaceFlinger::createDisplayEventConnection() {
560    return mEventThread->createEventConnection();
561}
562
563void SurfaceFlinger::connectDisplay(const sp<ISurfaceTexture>& surface) {
564
565    sp<IBinder> token;
566    { // scope for the lock
567        Mutex::Autolock _l(mStateLock);
568        token = mExtDisplayToken;
569    }
570
571    if (token == 0) {
572        token = createDisplay();
573    }
574
575    { // scope for the lock
576        Mutex::Autolock _l(mStateLock);
577        if (surface == 0) {
578            // release our current display. we're guarantee to have
579            // a reference to it (token), while we hold the lock
580            mExtDisplayToken = 0;
581        } else {
582            mExtDisplayToken = token;
583        }
584
585        DisplayDeviceState& info(mCurrentState.displays.editValueFor(token));
586        info.surface = surface;
587        setTransactionFlags(eDisplayTransactionNeeded);
588    }
589}
590
591// ----------------------------------------------------------------------------
592
593void SurfaceFlinger::waitForEvent() {
594    mEventQueue.waitMessage();
595}
596
597void SurfaceFlinger::signalTransaction() {
598    mEventQueue.invalidate();
599}
600
601void SurfaceFlinger::signalLayerUpdate() {
602    mEventQueue.invalidate();
603}
604
605void SurfaceFlinger::signalRefresh() {
606    mEventQueue.refresh();
607}
608
609status_t SurfaceFlinger::postMessageAsync(const sp<MessageBase>& msg,
610        nsecs_t reltime, uint32_t flags) {
611    return mEventQueue.postMessage(msg, reltime);
612}
613
614status_t SurfaceFlinger::postMessageSync(const sp<MessageBase>& msg,
615        nsecs_t reltime, uint32_t flags) {
616    status_t res = mEventQueue.postMessage(msg, reltime);
617    if (res == NO_ERROR) {
618        msg->wait();
619    }
620    return res;
621}
622
623bool SurfaceFlinger::threadLoop() {
624    waitForEvent();
625    return true;
626}
627
628void SurfaceFlinger::onVSyncReceived(int type, nsecs_t timestamp) {
629    if (uint32_t(type) < DisplayDevice::NUM_DISPLAY_TYPES) {
630        // we should only receive DisplayDevice::DisplayType from the vsync callback
631        const wp<IBinder>& token(mDefaultDisplays[type]);
632        mEventThread->onVSyncReceived(token, timestamp);
633    }
634}
635
636void SurfaceFlinger::eventControl(int event, int enabled) {
637    getHwComposer().eventControl(event, enabled);
638}
639
640void SurfaceFlinger::onMessageReceived(int32_t what) {
641    ATRACE_CALL();
642    switch (what) {
643    case MessageQueue::INVALIDATE:
644        handleMessageTransaction();
645        handleMessageInvalidate();
646        signalRefresh();
647        break;
648    case MessageQueue::REFRESH:
649        handleMessageRefresh();
650        break;
651    }
652}
653
654void SurfaceFlinger::handleMessageTransaction() {
655    uint32_t transactionFlags = peekTransactionFlags(eTransactionMask);
656    if (transactionFlags) {
657        handleTransaction(transactionFlags);
658    }
659}
660
661void SurfaceFlinger::handleMessageInvalidate() {
662    ATRACE_CALL();
663    handlePageFlip();
664}
665
666void SurfaceFlinger::handleMessageRefresh() {
667    ATRACE_CALL();
668    preComposition();
669    rebuildLayerStacks();
670    setUpHWComposer();
671    doDebugFlashRegions();
672    doComposition();
673    postComposition();
674}
675
676void SurfaceFlinger::doDebugFlashRegions()
677{
678    // is debugging enabled
679    if (CC_LIKELY(!mDebugRegion))
680        return;
681
682    const bool repaintEverything = mRepaintEverything;
683    for (size_t dpy=0 ; dpy<mDisplays.size() ; dpy++) {
684        const sp<DisplayDevice>& hw(mDisplays[dpy]);
685        if (hw->canDraw()) {
686            // transform the dirty region into this screen's coordinate space
687            const Region dirtyRegion(hw->getDirtyRegion(repaintEverything));
688            if (!dirtyRegion.isEmpty()) {
689                // redraw the whole screen
690                doComposeSurfaces(hw, Region(hw->bounds()));
691
692                // and draw the dirty region
693                glDisable(GL_TEXTURE_EXTERNAL_OES);
694                glDisable(GL_TEXTURE_2D);
695                glDisable(GL_BLEND);
696                glColor4f(1, 0, 1, 1);
697                const int32_t height = hw->getHeight();
698                Region::const_iterator it = dirtyRegion.begin();
699                Region::const_iterator const end = dirtyRegion.end();
700                while (it != end) {
701                    const Rect& r = *it++;
702                    GLfloat vertices[][2] = {
703                            { r.left,  height - r.top },
704                            { r.left,  height - r.bottom },
705                            { r.right, height - r.bottom },
706                            { r.right, height - r.top }
707                    };
708                    glVertexPointer(2, GL_FLOAT, 0, vertices);
709                    glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
710                }
711                hw->compositionComplete();
712                // FIXME
713                if (hw->getDisplayType() >= DisplayDevice::DISPLAY_VIRTUAL) {
714                    eglSwapBuffers(mEGLDisplay, hw->getEGLSurface());
715                }
716            }
717        }
718    }
719
720    postFramebuffer();
721
722    if (mDebugRegion > 1) {
723        usleep(mDebugRegion * 1000);
724    }
725}
726
727void SurfaceFlinger::preComposition()
728{
729    bool needExtraInvalidate = false;
730    const LayerVector& currentLayers(mDrawingState.layersSortedByZ);
731    const size_t count = currentLayers.size();
732    for (size_t i=0 ; i<count ; i++) {
733        if (currentLayers[i]->onPreComposition()) {
734            needExtraInvalidate = true;
735        }
736    }
737    if (needExtraInvalidate) {
738        signalLayerUpdate();
739    }
740}
741
742void SurfaceFlinger::postComposition()
743{
744    const LayerVector& currentLayers(mDrawingState.layersSortedByZ);
745    const size_t count = currentLayers.size();
746    for (size_t i=0 ; i<count ; i++) {
747        currentLayers[i]->onPostComposition();
748    }
749}
750
751void SurfaceFlinger::rebuildLayerStacks() {
752    // rebuild the visible layer list per screen
753    if (CC_UNLIKELY(mVisibleRegionsDirty)) {
754        ATRACE_CALL();
755        mVisibleRegionsDirty = false;
756        invalidateHwcGeometry();
757        const LayerVector& currentLayers(mDrawingState.layersSortedByZ);
758        for (size_t dpy=0 ; dpy<mDisplays.size() ; dpy++) {
759            const sp<DisplayDevice>& hw(mDisplays[dpy]);
760            const Transform& tr(hw->getTransform());
761            const Rect bounds(hw->getBounds());
762
763            Region opaqueRegion;
764            Region dirtyRegion;
765            computeVisibleRegions(currentLayers,
766                    hw->getLayerStack(), dirtyRegion, opaqueRegion);
767
768            Vector< sp<LayerBase> > layersSortedByZ;
769            const size_t count = currentLayers.size();
770            for (size_t i=0 ; i<count ; i++) {
771                const sp<LayerBase>& layer(currentLayers[i]);
772                const Layer::State& s(layer->drawingState());
773                if (s.layerStack == hw->getLayerStack()) {
774                    Region visibleRegion(tr.transform(layer->visibleRegion));
775                    visibleRegion.andSelf(bounds);
776                    if (!visibleRegion.isEmpty()) {
777                        layersSortedByZ.add(layer);
778                    }
779                }
780            }
781            hw->setVisibleLayersSortedByZ(layersSortedByZ);
782            hw->undefinedRegion.set(bounds);
783            hw->undefinedRegion.subtractSelf(tr.transform(opaqueRegion));
784            hw->dirtyRegion.orSelf(dirtyRegion);
785        }
786    }
787}
788
789void SurfaceFlinger::setUpHWComposer() {
790    HWComposer& hwc(getHwComposer());
791    if (hwc.initCheck() == NO_ERROR) {
792        // build the h/w work list
793        const bool workListsDirty = mHwWorkListDirty;
794        mHwWorkListDirty = false;
795        for (size_t dpy=0 ; dpy<mDisplays.size() ; dpy++) {
796            sp<const DisplayDevice> hw(mDisplays[dpy]);
797            const int32_t id = hw->getHwcDisplayId();
798            if (id >= 0) {
799                const Vector< sp<LayerBase> >& currentLayers(
800                    hw->getVisibleLayersSortedByZ());
801                const size_t count = currentLayers.size();
802                if (hwc.createWorkList(id, count) >= 0) {
803                    HWComposer::LayerListIterator cur = hwc.begin(id);
804                    const HWComposer::LayerListIterator end = hwc.end(id);
805                    for (size_t i=0 ; cur!=end && i<count ; ++i, ++cur) {
806                        const sp<LayerBase>& layer(currentLayers[i]);
807
808                        if (CC_UNLIKELY(workListsDirty)) {
809                            layer->setGeometry(hw, *cur);
810                            if (mDebugDisableHWC || mDebugRegion) {
811                                cur->setSkip(true);
812                            }
813                        }
814
815                        /*
816                         * update the per-frame h/w composer data for each layer
817                         * and build the transparent region of the FB
818                         */
819                        layer->setPerFrameData(hw, *cur);
820                    }
821                }
822            }
823        }
824        status_t err = hwc.prepare();
825        ALOGE_IF(err, "HWComposer::prepare failed (%s)", strerror(-err));
826    }
827}
828
829void SurfaceFlinger::doComposition() {
830    ATRACE_CALL();
831    const bool repaintEverything = android_atomic_and(0, &mRepaintEverything);
832    for (size_t dpy=0 ; dpy<mDisplays.size() ; dpy++) {
833        const sp<DisplayDevice>& hw(mDisplays[dpy]);
834        if (hw->canDraw()) {
835            // transform the dirty region into this screen's coordinate space
836            const Region dirtyRegion(hw->getDirtyRegion(repaintEverything));
837            if (!dirtyRegion.isEmpty()) {
838                // repaint the framebuffer (if needed)
839                doDisplayComposition(hw, dirtyRegion);
840            }
841            hw->dirtyRegion.clear();
842            hw->flip(hw->swapRegion);
843            hw->swapRegion.clear();
844        }
845        // inform the h/w that we're done compositing
846        hw->compositionComplete();
847    }
848    postFramebuffer();
849}
850
851void SurfaceFlinger::postFramebuffer()
852{
853    ATRACE_CALL();
854
855    const nsecs_t now = systemTime();
856    mDebugInSwapBuffers = now;
857
858    HWComposer& hwc(getHwComposer());
859    if (hwc.initCheck() == NO_ERROR) {
860        // FIXME: EGL spec says:
861        //   "surface must be bound to the calling thread's current context,
862        //    for the current rendering API."
863        DisplayDevice::makeCurrent(getDefaultDisplayDevice(), mEGLContext);
864        hwc.commit();
865    }
866
867    for (size_t dpy=0 ; dpy<mDisplays.size() ; dpy++) {
868        sp<const DisplayDevice> hw(mDisplays[dpy]);
869        const Vector< sp<LayerBase> >& currentLayers(hw->getVisibleLayersSortedByZ());
870        const size_t count = currentLayers.size();
871        int32_t id = hw->getHwcDisplayId();
872        if (id >=0 && hwc.initCheck() == NO_ERROR) {
873            HWComposer::LayerListIterator cur = hwc.begin(id);
874            const HWComposer::LayerListIterator end = hwc.end(id);
875            for (size_t i = 0; cur != end && i < count; ++i, ++cur) {
876                currentLayers[i]->onLayerDisplayed(hw, &*cur);
877            }
878        } else {
879            for (size_t i = 0; i < count; i++) {
880                currentLayers[i]->onLayerDisplayed(hw, NULL);
881            }
882        }
883    }
884
885    mLastSwapBufferTime = systemTime() - now;
886    mDebugInSwapBuffers = 0;
887}
888
889void SurfaceFlinger::handleTransaction(uint32_t transactionFlags)
890{
891    ATRACE_CALL();
892
893    Mutex::Autolock _l(mStateLock);
894    const nsecs_t now = systemTime();
895    mDebugInTransaction = now;
896
897    // Here we're guaranteed that some transaction flags are set
898    // so we can call handleTransactionLocked() unconditionally.
899    // We call getTransactionFlags(), which will also clear the flags,
900    // with mStateLock held to guarantee that mCurrentState won't change
901    // until the transaction is committed.
902
903    transactionFlags = getTransactionFlags(eTransactionMask);
904    handleTransactionLocked(transactionFlags);
905
906    mLastTransactionTime = systemTime() - now;
907    mDebugInTransaction = 0;
908    invalidateHwcGeometry();
909    // here the transaction has been committed
910}
911
912void SurfaceFlinger::handleTransactionLocked(uint32_t transactionFlags)
913{
914    const LayerVector& currentLayers(mCurrentState.layersSortedByZ);
915    const size_t count = currentLayers.size();
916
917    /*
918     * Traversal of the children
919     * (perform the transaction for each of them if needed)
920     */
921
922    if (transactionFlags & eTraversalNeeded) {
923        for (size_t i=0 ; i<count ; i++) {
924            const sp<LayerBase>& layer = currentLayers[i];
925            uint32_t trFlags = layer->getTransactionFlags(eTransactionNeeded);
926            if (!trFlags) continue;
927
928            const uint32_t flags = layer->doTransaction(0);
929            if (flags & Layer::eVisibleRegion)
930                mVisibleRegionsDirty = true;
931        }
932    }
933
934    /*
935     * Perform display own transactions if needed
936     */
937
938    if (transactionFlags & eDisplayTransactionNeeded) {
939        // here we take advantage of Vector's copy-on-write semantics to
940        // improve performance by skipping the transaction entirely when
941        // know that the lists are identical
942        const KeyedVector<  wp<IBinder>, DisplayDeviceState>& curr(mCurrentState.displays);
943        const KeyedVector<  wp<IBinder>, DisplayDeviceState>& draw(mDrawingState.displays);
944        if (!curr.isIdenticalTo(draw)) {
945            mVisibleRegionsDirty = true;
946            const size_t cc = curr.size();
947                  size_t dc = draw.size();
948
949            // find the displays that were removed
950            // (ie: in drawing state but not in current state)
951            // also handle displays that changed
952            // (ie: displays that are in both lists)
953            for (size_t i=0 ; i<dc ; i++) {
954                const ssize_t j = curr.indexOfKey(draw.keyAt(i));
955                if (j < 0) {
956                    // in drawing state but not in current state
957                    if (!draw[i].isMainDisplay()) {
958                        mDisplays.removeItem(draw.keyAt(i));
959                    } else {
960                        ALOGW("trying to remove the main display");
961                    }
962                } else {
963                    // this display is in both lists. see if something changed.
964                    const DisplayDeviceState& state(curr[j]);
965                    const wp<IBinder>& display(curr.keyAt(j));
966                    if (state.surface->asBinder() != draw[i].surface->asBinder()) {
967                        // changing the surface is like destroying and
968                        // recreating the DisplayDevice, so we just remove it
969                        // from the drawing state, so that it get re-added
970                        // below.
971                        mDisplays.removeItem(display);
972                        mDrawingState.displays.removeItemsAt(i);
973                        dc--; i--;
974                        // at this point we must loop to the next item
975                        continue;
976                    }
977
978                    const sp<DisplayDevice>& disp(getDisplayDevice(display));
979                    if (disp != NULL) {
980                        if (state.layerStack != draw[i].layerStack) {
981                            disp->setLayerStack(state.layerStack);
982                        }
983                        if (state.orientation != draw[i].orientation ||
984                                state.viewport != draw[i].viewport ||
985                                state.frame != draw[i].frame) {
986                            disp->setOrientation(state.orientation);
987                            // TODO: take viewport and frame into account
988                        }
989                    }
990                }
991            }
992
993            // find displays that were added
994            // (ie: in current state but not in drawing state)
995            for (size_t i=0 ; i<cc ; i++) {
996                if (draw.indexOfKey(curr.keyAt(i)) < 0) {
997                    const DisplayDeviceState& state(curr[i]);
998                    if (state.surface != NULL) {
999                        sp<SurfaceTextureClient> stc(
1000                                new SurfaceTextureClient(state.surface));
1001                        const wp<IBinder>& display(curr.keyAt(i));
1002                        sp<DisplayDevice> disp = new DisplayDevice(this,
1003                                state.type, display, stc, 0, mEGLConfig);
1004                        disp->setLayerStack(state.layerStack);
1005                        disp->setOrientation(state.orientation);
1006                        // TODO: take viewport and frame into account
1007                        mDisplays.add(display, disp);
1008                    }
1009                }
1010            }
1011        }
1012    }
1013
1014    /*
1015     * Perform our own transaction if needed
1016     */
1017
1018    const LayerVector& previousLayers(mDrawingState.layersSortedByZ);
1019    if (currentLayers.size() > previousLayers.size()) {
1020        // layers have been added
1021        mVisibleRegionsDirty = true;
1022    }
1023
1024    // some layers might have been removed, so
1025    // we need to update the regions they're exposing.
1026    if (mLayersRemoved) {
1027        mLayersRemoved = false;
1028        mVisibleRegionsDirty = true;
1029        const size_t count = previousLayers.size();
1030        for (size_t i=0 ; i<count ; i++) {
1031            const sp<LayerBase>& layer(previousLayers[i]);
1032            if (currentLayers.indexOf(layer) < 0) {
1033                // this layer is not visible anymore
1034                // TODO: we could traverse the tree from front to back and
1035                //       compute the actual visible region
1036                // TODO: we could cache the transformed region
1037                Layer::State front(layer->drawingState());
1038                Region visibleReg = front.transform.transform(
1039                        Region(Rect(front.active.w, front.active.h)));
1040                invalidateLayerStack(front.layerStack, visibleReg);
1041            }
1042        }
1043    }
1044
1045    commitTransaction();
1046}
1047
1048void SurfaceFlinger::commitTransaction()
1049{
1050    if (!mLayersPendingRemoval.isEmpty()) {
1051        // Notify removed layers now that they can't be drawn from
1052        for (size_t i = 0; i < mLayersPendingRemoval.size(); i++) {
1053            mLayersPendingRemoval[i]->onRemoved();
1054        }
1055        mLayersPendingRemoval.clear();
1056    }
1057
1058    mDrawingState = mCurrentState;
1059    mTransationPending = false;
1060    mTransactionCV.broadcast();
1061}
1062
1063void SurfaceFlinger::computeVisibleRegions(
1064        const LayerVector& currentLayers, uint32_t layerStack,
1065        Region& outDirtyRegion, Region& outOpaqueRegion)
1066{
1067    ATRACE_CALL();
1068
1069    Region aboveOpaqueLayers;
1070    Region aboveCoveredLayers;
1071    Region dirty;
1072
1073    outDirtyRegion.clear();
1074
1075    size_t i = currentLayers.size();
1076    while (i--) {
1077        const sp<LayerBase>& layer = currentLayers[i];
1078
1079        // start with the whole surface at its current location
1080        const Layer::State& s(layer->drawingState());
1081
1082        // only consider the layers on the given later stack
1083        if (s.layerStack != layerStack)
1084            continue;
1085
1086        /*
1087         * opaqueRegion: area of a surface that is fully opaque.
1088         */
1089        Region opaqueRegion;
1090
1091        /*
1092         * visibleRegion: area of a surface that is visible on screen
1093         * and not fully transparent. This is essentially the layer's
1094         * footprint minus the opaque regions above it.
1095         * Areas covered by a translucent surface are considered visible.
1096         */
1097        Region visibleRegion;
1098
1099        /*
1100         * coveredRegion: area of a surface that is covered by all
1101         * visible regions above it (which includes the translucent areas).
1102         */
1103        Region coveredRegion;
1104
1105
1106        // handle hidden surfaces by setting the visible region to empty
1107        if (CC_LIKELY(!(s.flags & layer_state_t::eLayerHidden) && s.alpha)) {
1108            const bool translucent = !layer->isOpaque();
1109            Rect bounds(layer->computeBounds());
1110            visibleRegion.set(bounds);
1111            if (!visibleRegion.isEmpty()) {
1112                // Remove the transparent area from the visible region
1113                if (translucent) {
1114                    Region transparentRegionScreen;
1115                    const Transform tr(s.transform);
1116                    if (tr.transformed()) {
1117                        if (tr.preserveRects()) {
1118                            // transform the transparent region
1119                            transparentRegionScreen = tr.transform(s.transparentRegion);
1120                        } else {
1121                            // transformation too complex, can't do the
1122                            // transparent region optimization.
1123                            transparentRegionScreen.clear();
1124                        }
1125                    } else {
1126                        transparentRegionScreen = s.transparentRegion;
1127                    }
1128                    visibleRegion.subtractSelf(transparentRegionScreen);
1129                }
1130
1131                // compute the opaque region
1132                const int32_t layerOrientation = s.transform.getOrientation();
1133                if (s.alpha==255 && !translucent &&
1134                        ((layerOrientation & Transform::ROT_INVALID) == false)) {
1135                    // the opaque region is the layer's footprint
1136                    opaqueRegion = visibleRegion;
1137                }
1138            }
1139        }
1140
1141        // Clip the covered region to the visible region
1142        coveredRegion = aboveCoveredLayers.intersect(visibleRegion);
1143
1144        // Update aboveCoveredLayers for next (lower) layer
1145        aboveCoveredLayers.orSelf(visibleRegion);
1146
1147        // subtract the opaque region covered by the layers above us
1148        visibleRegion.subtractSelf(aboveOpaqueLayers);
1149
1150        // compute this layer's dirty region
1151        if (layer->contentDirty) {
1152            // we need to invalidate the whole region
1153            dirty = visibleRegion;
1154            // as well, as the old visible region
1155            dirty.orSelf(layer->visibleRegion);
1156            layer->contentDirty = false;
1157        } else {
1158            /* compute the exposed region:
1159             *   the exposed region consists of two components:
1160             *   1) what's VISIBLE now and was COVERED before
1161             *   2) what's EXPOSED now less what was EXPOSED before
1162             *
1163             * note that (1) is conservative, we start with the whole
1164             * visible region but only keep what used to be covered by
1165             * something -- which mean it may have been exposed.
1166             *
1167             * (2) handles areas that were not covered by anything but got
1168             * exposed because of a resize.
1169             */
1170            const Region newExposed = visibleRegion - coveredRegion;
1171            const Region oldVisibleRegion = layer->visibleRegion;
1172            const Region oldCoveredRegion = layer->coveredRegion;
1173            const Region oldExposed = oldVisibleRegion - oldCoveredRegion;
1174            dirty = (visibleRegion&oldCoveredRegion) | (newExposed-oldExposed);
1175        }
1176        dirty.subtractSelf(aboveOpaqueLayers);
1177
1178        // accumulate to the screen dirty region
1179        outDirtyRegion.orSelf(dirty);
1180
1181        // Update aboveOpaqueLayers for next (lower) layer
1182        aboveOpaqueLayers.orSelf(opaqueRegion);
1183
1184        // Store the visible region is screen space
1185        layer->setVisibleRegion(visibleRegion);
1186        layer->setCoveredRegion(coveredRegion);
1187    }
1188
1189    outOpaqueRegion = aboveOpaqueLayers;
1190}
1191
1192void SurfaceFlinger::invalidateLayerStack(uint32_t layerStack,
1193        const Region& dirty) {
1194    for (size_t dpy=0 ; dpy<mDisplays.size() ; dpy++) {
1195        const sp<DisplayDevice>& hw(mDisplays[dpy]);
1196        if (hw->getLayerStack() == layerStack) {
1197            hw->dirtyRegion.orSelf(dirty);
1198        }
1199    }
1200}
1201
1202void SurfaceFlinger::handlePageFlip()
1203{
1204    Region dirtyRegion;
1205
1206    bool visibleRegions = false;
1207    const LayerVector& currentLayers(mDrawingState.layersSortedByZ);
1208    const size_t count = currentLayers.size();
1209    for (size_t i=0 ; i<count ; i++) {
1210        const sp<LayerBase>& layer(currentLayers[i]);
1211        const Region dirty(layer->latchBuffer(visibleRegions));
1212        Layer::State s(layer->drawingState());
1213        invalidateLayerStack(s.layerStack, dirty);
1214    }
1215
1216    mVisibleRegionsDirty |= visibleRegions;
1217}
1218
1219void SurfaceFlinger::invalidateHwcGeometry()
1220{
1221    mHwWorkListDirty = true;
1222}
1223
1224
1225void SurfaceFlinger::doDisplayComposition(const sp<const DisplayDevice>& hw,
1226        const Region& inDirtyRegion)
1227{
1228    Region dirtyRegion(inDirtyRegion);
1229
1230    // compute the invalid region
1231    hw->swapRegion.orSelf(dirtyRegion);
1232
1233    uint32_t flags = hw->getFlags();
1234    if (flags & DisplayDevice::SWAP_RECTANGLE) {
1235        // we can redraw only what's dirty, but since SWAP_RECTANGLE only
1236        // takes a rectangle, we must make sure to update that whole
1237        // rectangle in that case
1238        dirtyRegion.set(hw->swapRegion.bounds());
1239    } else {
1240        if (flags & DisplayDevice::PARTIAL_UPDATES) {
1241            // We need to redraw the rectangle that will be updated
1242            // (pushed to the framebuffer).
1243            // This is needed because PARTIAL_UPDATES only takes one
1244            // rectangle instead of a region (see DisplayDevice::flip())
1245            dirtyRegion.set(hw->swapRegion.bounds());
1246        } else {
1247            // we need to redraw everything (the whole screen)
1248            dirtyRegion.set(hw->bounds());
1249            hw->swapRegion = dirtyRegion;
1250        }
1251    }
1252
1253    doComposeSurfaces(hw, dirtyRegion);
1254
1255    // FIXME: we need to call eglSwapBuffers() on displays that have
1256    // GL composition and only on those.
1257    // however, currently hwc.commit() already does that for the main
1258    // display (if there is a hwc) and never for the other ones
1259    if (hw->getDisplayType() >= DisplayDevice::DISPLAY_VIRTUAL ||
1260            getHwComposer().initCheck() != NO_ERROR) {
1261        // FIXME: EGL spec says:
1262        //   "surface must be bound to the calling thread's current context,
1263        //    for the current rendering API."
1264        eglSwapBuffers(mEGLDisplay, hw->getEGLSurface());
1265    }
1266
1267    // update the swap region and clear the dirty region
1268    hw->swapRegion.orSelf(dirtyRegion);
1269}
1270
1271void SurfaceFlinger::doComposeSurfaces(const sp<const DisplayDevice>& hw, const Region& dirty)
1272{
1273    const int32_t id = hw->getHwcDisplayId();
1274    HWComposer& hwc(getHwComposer());
1275    HWComposer::LayerListIterator cur = hwc.begin(id);
1276    const HWComposer::LayerListIterator end = hwc.end(id);
1277
1278    const bool hasGlesComposition = hwc.hasGlesComposition(id) || (cur==end);
1279    if (hasGlesComposition) {
1280        DisplayDevice::makeCurrent(hw, mEGLContext);
1281
1282        // set the frame buffer
1283        glMatrixMode(GL_MODELVIEW);
1284        glLoadIdentity();
1285
1286        // Never touch the framebuffer if we don't have any framebuffer layers
1287        const bool hasHwcComposition = hwc.hasHwcComposition(id);
1288        if (hasHwcComposition) {
1289            // when using overlays, we assume a fully transparent framebuffer
1290            // NOTE: we could reduce how much we need to clear, for instance
1291            // remove where there are opaque FB layers. however, on some
1292            // GPUs doing a "clean slate" glClear might be more efficient.
1293            // We'll revisit later if needed.
1294            glClearColor(0, 0, 0, 0);
1295            glClear(GL_COLOR_BUFFER_BIT);
1296        } else {
1297            const Region region(hw->undefinedRegion.intersect(dirty));
1298            // screen is already cleared here
1299            if (!region.isEmpty()) {
1300                // can happen with SurfaceView
1301                drawWormhole(hw, region);
1302            }
1303        }
1304    }
1305
1306    /*
1307     * and then, render the layers targeted at the framebuffer
1308     */
1309
1310    const Vector< sp<LayerBase> >& layers(hw->getVisibleLayersSortedByZ());
1311    const size_t count = layers.size();
1312    const Transform& tr = hw->getTransform();
1313    if (cur != end) {
1314        // we're using h/w composer
1315        for (size_t i=0 ; i<count && cur!=end ; ++i, ++cur) {
1316            const sp<LayerBase>& layer(layers[i]);
1317            const Region clip(dirty.intersect(tr.transform(layer->visibleRegion)));
1318            if (!clip.isEmpty()) {
1319                switch (cur->getCompositionType()) {
1320                    case HWC_OVERLAY: {
1321                        if ((cur->getHints() & HWC_HINT_CLEAR_FB)
1322                                && i
1323                                && layer->isOpaque()
1324                                && hasGlesComposition) {
1325                            // never clear the very first layer since we're
1326                            // guaranteed the FB is already cleared
1327                            layer->clearWithOpenGL(hw, clip);
1328                        }
1329                        break;
1330                    }
1331                    case HWC_FRAMEBUFFER: {
1332                        layer->draw(hw, clip);
1333                        break;
1334                    }
1335                }
1336            }
1337            layer->setAcquireFence(hw, *cur);
1338        }
1339    } else {
1340        // we're not using h/w composer
1341        for (size_t i=0 ; i<count ; ++i) {
1342            const sp<LayerBase>& layer(layers[i]);
1343            const Region clip(dirty.intersect(
1344                    tr.transform(layer->visibleRegion)));
1345            if (!clip.isEmpty()) {
1346                layer->draw(hw, clip);
1347            }
1348        }
1349    }
1350}
1351
1352void SurfaceFlinger::drawWormhole(const sp<const DisplayDevice>& hw,
1353        const Region& region) const
1354{
1355    glDisable(GL_TEXTURE_EXTERNAL_OES);
1356    glDisable(GL_TEXTURE_2D);
1357    glDisable(GL_BLEND);
1358    glColor4f(0,0,0,0);
1359
1360    const int32_t height = hw->getHeight();
1361    Region::const_iterator it = region.begin();
1362    Region::const_iterator const end = region.end();
1363    while (it != end) {
1364        const Rect& r = *it++;
1365        GLfloat vertices[][2] = {
1366                { r.left,  height - r.top },
1367                { r.left,  height - r.bottom },
1368                { r.right, height - r.bottom },
1369                { r.right, height - r.top }
1370        };
1371        glVertexPointer(2, GL_FLOAT, 0, vertices);
1372        glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
1373    }
1374}
1375
1376ssize_t SurfaceFlinger::addClientLayer(const sp<Client>& client,
1377        const sp<LayerBaseClient>& lbc)
1378{
1379    // attach this layer to the client
1380    size_t name = client->attachLayer(lbc);
1381
1382    // add this layer to the current state list
1383    Mutex::Autolock _l(mStateLock);
1384    mCurrentState.layersSortedByZ.add(lbc);
1385
1386    return ssize_t(name);
1387}
1388
1389status_t SurfaceFlinger::removeLayer(const sp<LayerBase>& layer)
1390{
1391    Mutex::Autolock _l(mStateLock);
1392    status_t err = purgatorizeLayer_l(layer);
1393    if (err == NO_ERROR)
1394        setTransactionFlags(eTransactionNeeded);
1395    return err;
1396}
1397
1398status_t SurfaceFlinger::removeLayer_l(const sp<LayerBase>& layerBase)
1399{
1400    ssize_t index = mCurrentState.layersSortedByZ.remove(layerBase);
1401    if (index >= 0) {
1402        mLayersRemoved = true;
1403        return NO_ERROR;
1404    }
1405    return status_t(index);
1406}
1407
1408status_t SurfaceFlinger::purgatorizeLayer_l(const sp<LayerBase>& layerBase)
1409{
1410    // First add the layer to the purgatory list, which makes sure it won't
1411    // go away, then remove it from the main list (through a transaction).
1412    ssize_t err = removeLayer_l(layerBase);
1413    if (err >= 0) {
1414        mLayerPurgatory.add(layerBase);
1415    }
1416
1417    mLayersPendingRemoval.push(layerBase);
1418
1419    // it's possible that we don't find a layer, because it might
1420    // have been destroyed already -- this is not technically an error
1421    // from the user because there is a race between Client::destroySurface(),
1422    // ~Client() and ~ISurface().
1423    return (err == NAME_NOT_FOUND) ? status_t(NO_ERROR) : err;
1424}
1425
1426uint32_t SurfaceFlinger::peekTransactionFlags(uint32_t flags)
1427{
1428    return android_atomic_release_load(&mTransactionFlags);
1429}
1430
1431uint32_t SurfaceFlinger::getTransactionFlags(uint32_t flags)
1432{
1433    return android_atomic_and(~flags, &mTransactionFlags) & flags;
1434}
1435
1436uint32_t SurfaceFlinger::setTransactionFlags(uint32_t flags)
1437{
1438    uint32_t old = android_atomic_or(flags, &mTransactionFlags);
1439    if ((old & flags)==0) { // wake the server up
1440        signalTransaction();
1441    }
1442    return old;
1443}
1444
1445void SurfaceFlinger::setTransactionState(
1446        const Vector<ComposerState>& state,
1447        const Vector<DisplayState>& displays,
1448        uint32_t flags)
1449{
1450    Mutex::Autolock _l(mStateLock);
1451    uint32_t transactionFlags = 0;
1452
1453    size_t count = displays.size();
1454    for (size_t i=0 ; i<count ; i++) {
1455        const DisplayState& s(displays[i]);
1456        transactionFlags |= setDisplayStateLocked(s);
1457    }
1458
1459    count = state.size();
1460    for (size_t i=0 ; i<count ; i++) {
1461        const ComposerState& s(state[i]);
1462        sp<Client> client( static_cast<Client *>(s.client.get()) );
1463        transactionFlags |= setClientStateLocked(client, s.state);
1464    }
1465
1466    if (transactionFlags) {
1467        // this triggers the transaction
1468        setTransactionFlags(transactionFlags);
1469
1470        // if this is a synchronous transaction, wait for it to take effect
1471        // before returning.
1472        if (flags & eSynchronous) {
1473            mTransationPending = true;
1474        }
1475        while (mTransationPending) {
1476            status_t err = mTransactionCV.waitRelative(mStateLock, s2ns(5));
1477            if (CC_UNLIKELY(err != NO_ERROR)) {
1478                // just in case something goes wrong in SF, return to the
1479                // called after a few seconds.
1480                ALOGW_IF(err == TIMED_OUT, "closeGlobalTransaction timed out!");
1481                mTransationPending = false;
1482                break;
1483            }
1484        }
1485    }
1486}
1487
1488uint32_t SurfaceFlinger::setDisplayStateLocked(const DisplayState& s)
1489{
1490    uint32_t flags = 0;
1491    DisplayDeviceState& disp(mCurrentState.displays.editValueFor(s.token));
1492    if (disp.isValid()) {
1493        const uint32_t what = s.what;
1494        if (what & DisplayState::eSurfaceChanged) {
1495            if (disp.surface->asBinder() != s.surface->asBinder()) {
1496                disp.surface = s.surface;
1497                flags |= eDisplayTransactionNeeded;
1498            }
1499        }
1500        if (what & DisplayState::eLayerStackChanged) {
1501            if (disp.layerStack != s.layerStack) {
1502                disp.layerStack = s.layerStack;
1503                flags |= eDisplayTransactionNeeded;
1504            }
1505        }
1506        if (what & DisplayState::eOrientationChanged) {
1507            if (disp.orientation != s.orientation) {
1508                disp.orientation = s.orientation;
1509                flags |= eDisplayTransactionNeeded;
1510            }
1511        }
1512        if (what & DisplayState::eFrameChanged) {
1513            if (disp.frame != s.frame) {
1514                disp.frame = s.frame;
1515                flags |= eDisplayTransactionNeeded;
1516            }
1517        }
1518        if (what & DisplayState::eViewportChanged) {
1519            if (disp.viewport != s.viewport) {
1520                disp.viewport = s.viewport;
1521                flags |= eDisplayTransactionNeeded;
1522            }
1523        }
1524    }
1525    return flags;
1526}
1527
1528uint32_t SurfaceFlinger::setClientStateLocked(
1529        const sp<Client>& client,
1530        const layer_state_t& s)
1531{
1532    uint32_t flags = 0;
1533    sp<LayerBaseClient> layer(client->getLayerUser(s.surface));
1534    if (layer != 0) {
1535        const uint32_t what = s.what;
1536        if (what & layer_state_t::ePositionChanged) {
1537            if (layer->setPosition(s.x, s.y))
1538                flags |= eTraversalNeeded;
1539        }
1540        if (what & layer_state_t::eLayerChanged) {
1541            // NOTE: index needs to be calculated before we update the state
1542            ssize_t idx = mCurrentState.layersSortedByZ.indexOf(layer);
1543            if (layer->setLayer(s.z)) {
1544                mCurrentState.layersSortedByZ.removeAt(idx);
1545                mCurrentState.layersSortedByZ.add(layer);
1546                // we need traversal (state changed)
1547                // AND transaction (list changed)
1548                flags |= eTransactionNeeded|eTraversalNeeded;
1549            }
1550        }
1551        if (what & layer_state_t::eSizeChanged) {
1552            if (layer->setSize(s.w, s.h)) {
1553                flags |= eTraversalNeeded;
1554            }
1555        }
1556        if (what & layer_state_t::eAlphaChanged) {
1557            if (layer->setAlpha(uint8_t(255.0f*s.alpha+0.5f)))
1558                flags |= eTraversalNeeded;
1559        }
1560        if (what & layer_state_t::eMatrixChanged) {
1561            if (layer->setMatrix(s.matrix))
1562                flags |= eTraversalNeeded;
1563        }
1564        if (what & layer_state_t::eTransparentRegionChanged) {
1565            if (layer->setTransparentRegionHint(s.transparentRegion))
1566                flags |= eTraversalNeeded;
1567        }
1568        if (what & layer_state_t::eVisibilityChanged) {
1569            if (layer->setFlags(s.flags, s.mask))
1570                flags |= eTraversalNeeded;
1571        }
1572        if (what & layer_state_t::eCropChanged) {
1573            if (layer->setCrop(s.crop))
1574                flags |= eTraversalNeeded;
1575        }
1576        if (what & layer_state_t::eLayerStackChanged) {
1577            // NOTE: index needs to be calculated before we update the state
1578            ssize_t idx = mCurrentState.layersSortedByZ.indexOf(layer);
1579            if (layer->setLayerStack(s.layerStack)) {
1580                mCurrentState.layersSortedByZ.removeAt(idx);
1581                mCurrentState.layersSortedByZ.add(layer);
1582                // we need traversal (state changed)
1583                // AND transaction (list changed)
1584                flags |= eTransactionNeeded|eTraversalNeeded;
1585            }
1586        }
1587    }
1588    return flags;
1589}
1590
1591sp<ISurface> SurfaceFlinger::createLayer(
1592        ISurfaceComposerClient::surface_data_t* params,
1593        const String8& name,
1594        const sp<Client>& client,
1595       uint32_t w, uint32_t h, PixelFormat format,
1596        uint32_t flags)
1597{
1598    sp<LayerBaseClient> layer;
1599    sp<ISurface> surfaceHandle;
1600
1601    if (int32_t(w|h) < 0) {
1602        ALOGE("createLayer() failed, w or h is negative (w=%d, h=%d)",
1603                int(w), int(h));
1604        return surfaceHandle;
1605    }
1606
1607    //ALOGD("createLayer for (%d x %d), name=%s", w, h, name.string());
1608    switch (flags & ISurfaceComposerClient::eFXSurfaceMask) {
1609        case ISurfaceComposerClient::eFXSurfaceNormal:
1610            layer = createNormalLayer(client, w, h, flags, format);
1611            break;
1612        case ISurfaceComposerClient::eFXSurfaceBlur:
1613        case ISurfaceComposerClient::eFXSurfaceDim:
1614            layer = createDimLayer(client, w, h, flags);
1615            break;
1616        case ISurfaceComposerClient::eFXSurfaceScreenshot:
1617            layer = createScreenshotLayer(client, w, h, flags);
1618            break;
1619    }
1620
1621    if (layer != 0) {
1622        layer->initStates(w, h, flags);
1623        layer->setName(name);
1624        ssize_t token = addClientLayer(client, layer);
1625        surfaceHandle = layer->getSurface();
1626        if (surfaceHandle != 0) {
1627            params->token = token;
1628            params->identity = layer->getIdentity();
1629        }
1630        setTransactionFlags(eTransactionNeeded);
1631    }
1632
1633    return surfaceHandle;
1634}
1635
1636sp<Layer> SurfaceFlinger::createNormalLayer(
1637        const sp<Client>& client,
1638        uint32_t w, uint32_t h, uint32_t flags,
1639        PixelFormat& format)
1640{
1641    // initialize the surfaces
1642    switch (format) {
1643    case PIXEL_FORMAT_TRANSPARENT:
1644    case PIXEL_FORMAT_TRANSLUCENT:
1645        format = PIXEL_FORMAT_RGBA_8888;
1646        break;
1647    case PIXEL_FORMAT_OPAQUE:
1648#ifdef NO_RGBX_8888
1649        format = PIXEL_FORMAT_RGB_565;
1650#else
1651        format = PIXEL_FORMAT_RGBX_8888;
1652#endif
1653        break;
1654    }
1655
1656#ifdef NO_RGBX_8888
1657    if (format == PIXEL_FORMAT_RGBX_8888)
1658        format = PIXEL_FORMAT_RGBA_8888;
1659#endif
1660
1661    sp<Layer> layer = new Layer(this, client);
1662    status_t err = layer->setBuffers(w, h, format, flags);
1663    if (CC_LIKELY(err != NO_ERROR)) {
1664        ALOGE("createNormalLayer() failed (%s)", strerror(-err));
1665        layer.clear();
1666    }
1667    return layer;
1668}
1669
1670sp<LayerDim> SurfaceFlinger::createDimLayer(
1671        const sp<Client>& client,
1672        uint32_t w, uint32_t h, uint32_t flags)
1673{
1674    sp<LayerDim> layer = new LayerDim(this, client);
1675    return layer;
1676}
1677
1678sp<LayerScreenshot> SurfaceFlinger::createScreenshotLayer(
1679        const sp<Client>& client,
1680        uint32_t w, uint32_t h, uint32_t flags)
1681{
1682    sp<LayerScreenshot> layer = new LayerScreenshot(this, client);
1683    return layer;
1684}
1685
1686status_t SurfaceFlinger::onLayerRemoved(const sp<Client>& client, SurfaceID sid)
1687{
1688    /*
1689     * called by the window manager, when a surface should be marked for
1690     * destruction.
1691     *
1692     * The surface is removed from the current and drawing lists, but placed
1693     * in the purgatory queue, so it's not destroyed right-away (we need
1694     * to wait for all client's references to go away first).
1695     */
1696
1697    status_t err = NAME_NOT_FOUND;
1698    Mutex::Autolock _l(mStateLock);
1699    sp<LayerBaseClient> layer = client->getLayerUser(sid);
1700
1701    if (layer != 0) {
1702        err = purgatorizeLayer_l(layer);
1703        if (err == NO_ERROR) {
1704            setTransactionFlags(eTransactionNeeded);
1705        }
1706    }
1707    return err;
1708}
1709
1710status_t SurfaceFlinger::onLayerDestroyed(const wp<LayerBaseClient>& layer)
1711{
1712    // called by ~ISurface() when all references are gone
1713    status_t err = NO_ERROR;
1714    sp<LayerBaseClient> l(layer.promote());
1715    if (l != NULL) {
1716        Mutex::Autolock _l(mStateLock);
1717        err = removeLayer_l(l);
1718        if (err == NAME_NOT_FOUND) {
1719            // The surface wasn't in the current list, which means it was
1720            // removed already, which means it is in the purgatory,
1721            // and need to be removed from there.
1722            ssize_t idx = mLayerPurgatory.remove(l);
1723            ALOGE_IF(idx < 0,
1724                    "layer=%p is not in the purgatory list", l.get());
1725        }
1726        ALOGE_IF(err<0 && err != NAME_NOT_FOUND,
1727                "error removing layer=%p (%s)", l.get(), strerror(-err));
1728    }
1729    return err;
1730}
1731
1732// ---------------------------------------------------------------------------
1733
1734void SurfaceFlinger::onInitializeDisplays() {
1735    // reset screen orientation
1736    Vector<ComposerState> state;
1737    Vector<DisplayState> displays;
1738    DisplayState d;
1739    d.what = DisplayState::eOrientationChanged;
1740    d.token = mDefaultDisplays[DisplayDevice::DISPLAY_PRIMARY];
1741    d.orientation = DisplayState::eOrientationDefault;
1742    displays.add(d);
1743    setTransactionState(state, displays, 0);
1744
1745    // XXX: this should init default device to "unblank" and all other devices to "blank"
1746    onScreenAcquired();
1747}
1748
1749void SurfaceFlinger::initializeDisplays() {
1750    class MessageScreenInitialized : public MessageBase {
1751        SurfaceFlinger* flinger;
1752    public:
1753        MessageScreenInitialized(SurfaceFlinger* flinger) : flinger(flinger) { }
1754        virtual bool handler() {
1755            flinger->onInitializeDisplays();
1756            return true;
1757        }
1758    };
1759    sp<MessageBase> msg = new MessageScreenInitialized(this);
1760    postMessageAsync(msg);  // we may be called from main thread, use async message
1761}
1762
1763
1764void SurfaceFlinger::onScreenAcquired() {
1765    ALOGD("Screen about to return, flinger = %p", this);
1766    sp<const DisplayDevice> hw(getDefaultDisplayDevice()); // XXX: this should be per DisplayDevice
1767    getHwComposer().acquire();
1768    hw->acquireScreen();
1769    mEventThread->onScreenAcquired();
1770    mVisibleRegionsDirty = true;
1771    repaintEverything();
1772}
1773
1774void SurfaceFlinger::onScreenReleased() {
1775    ALOGD("About to give-up screen, flinger = %p", this);
1776    sp<const DisplayDevice> hw(getDefaultDisplayDevice()); // XXX: this should be per DisplayDevice
1777    if (hw->isScreenAcquired()) {
1778        mEventThread->onScreenReleased();
1779        hw->releaseScreen();
1780        getHwComposer().release();
1781        // from this point on, SF will stop drawing
1782    }
1783}
1784
1785void SurfaceFlinger::unblank() {
1786    class MessageScreenAcquired : public MessageBase {
1787        SurfaceFlinger* flinger;
1788    public:
1789        MessageScreenAcquired(SurfaceFlinger* flinger) : flinger(flinger) { }
1790        virtual bool handler() {
1791            flinger->onScreenAcquired();
1792            return true;
1793        }
1794    };
1795    sp<MessageBase> msg = new MessageScreenAcquired(this);
1796    postMessageSync(msg);
1797}
1798
1799void SurfaceFlinger::blank() {
1800    class MessageScreenReleased : public MessageBase {
1801        SurfaceFlinger* flinger;
1802    public:
1803        MessageScreenReleased(SurfaceFlinger* flinger) : flinger(flinger) { }
1804        virtual bool handler() {
1805            flinger->onScreenReleased();
1806            return true;
1807        }
1808    };
1809    sp<MessageBase> msg = new MessageScreenReleased(this);
1810    postMessageSync(msg);
1811}
1812
1813// ---------------------------------------------------------------------------
1814
1815status_t SurfaceFlinger::dump(int fd, const Vector<String16>& args)
1816{
1817    const size_t SIZE = 4096;
1818    char buffer[SIZE];
1819    String8 result;
1820
1821    if (!PermissionCache::checkCallingPermission(sDump)) {
1822        snprintf(buffer, SIZE, "Permission Denial: "
1823                "can't dump SurfaceFlinger from pid=%d, uid=%d\n",
1824                IPCThreadState::self()->getCallingPid(),
1825                IPCThreadState::self()->getCallingUid());
1826        result.append(buffer);
1827    } else {
1828        // Try to get the main lock, but don't insist if we can't
1829        // (this would indicate SF is stuck, but we want to be able to
1830        // print something in dumpsys).
1831        int retry = 3;
1832        while (mStateLock.tryLock()<0 && --retry>=0) {
1833            usleep(1000000);
1834        }
1835        const bool locked(retry >= 0);
1836        if (!locked) {
1837            snprintf(buffer, SIZE,
1838                    "SurfaceFlinger appears to be unresponsive, "
1839                    "dumping anyways (no locks held)\n");
1840            result.append(buffer);
1841        }
1842
1843        bool dumpAll = true;
1844        size_t index = 0;
1845        size_t numArgs = args.size();
1846        if (numArgs) {
1847            if ((index < numArgs) &&
1848                    (args[index] == String16("--list"))) {
1849                index++;
1850                listLayersLocked(args, index, result, buffer, SIZE);
1851                dumpAll = false;
1852            }
1853
1854            if ((index < numArgs) &&
1855                    (args[index] == String16("--latency"))) {
1856                index++;
1857                dumpStatsLocked(args, index, result, buffer, SIZE);
1858                dumpAll = false;
1859            }
1860
1861            if ((index < numArgs) &&
1862                    (args[index] == String16("--latency-clear"))) {
1863                index++;
1864                clearStatsLocked(args, index, result, buffer, SIZE);
1865                dumpAll = false;
1866            }
1867        }
1868
1869        if (dumpAll) {
1870            dumpAllLocked(result, buffer, SIZE);
1871        }
1872
1873        if (locked) {
1874            mStateLock.unlock();
1875        }
1876    }
1877    write(fd, result.string(), result.size());
1878    return NO_ERROR;
1879}
1880
1881void SurfaceFlinger::listLayersLocked(const Vector<String16>& args, size_t& index,
1882        String8& result, char* buffer, size_t SIZE) const
1883{
1884    const LayerVector& currentLayers = mCurrentState.layersSortedByZ;
1885    const size_t count = currentLayers.size();
1886    for (size_t i=0 ; i<count ; i++) {
1887        const sp<LayerBase>& layer(currentLayers[i]);
1888        snprintf(buffer, SIZE, "%s\n", layer->getName().string());
1889        result.append(buffer);
1890    }
1891}
1892
1893void SurfaceFlinger::dumpStatsLocked(const Vector<String16>& args, size_t& index,
1894        String8& result, char* buffer, size_t SIZE) const
1895{
1896    String8 name;
1897    if (index < args.size()) {
1898        name = String8(args[index]);
1899        index++;
1900    }
1901
1902    const LayerVector& currentLayers = mCurrentState.layersSortedByZ;
1903    const size_t count = currentLayers.size();
1904    for (size_t i=0 ; i<count ; i++) {
1905        const sp<LayerBase>& layer(currentLayers[i]);
1906        if (name.isEmpty()) {
1907            snprintf(buffer, SIZE, "%s\n", layer->getName().string());
1908            result.append(buffer);
1909        }
1910        if (name.isEmpty() || (name == layer->getName())) {
1911            layer->dumpStats(result, buffer, SIZE);
1912        }
1913    }
1914}
1915
1916void SurfaceFlinger::clearStatsLocked(const Vector<String16>& args, size_t& index,
1917        String8& result, char* buffer, size_t SIZE) const
1918{
1919    String8 name;
1920    if (index < args.size()) {
1921        name = String8(args[index]);
1922        index++;
1923    }
1924
1925    const LayerVector& currentLayers = mCurrentState.layersSortedByZ;
1926    const size_t count = currentLayers.size();
1927    for (size_t i=0 ; i<count ; i++) {
1928        const sp<LayerBase>& layer(currentLayers[i]);
1929        if (name.isEmpty() || (name == layer->getName())) {
1930            layer->clearStats();
1931        }
1932    }
1933}
1934
1935void SurfaceFlinger::dumpAllLocked(
1936        String8& result, char* buffer, size_t SIZE) const
1937{
1938    // figure out if we're stuck somewhere
1939    const nsecs_t now = systemTime();
1940    const nsecs_t inSwapBuffers(mDebugInSwapBuffers);
1941    const nsecs_t inTransaction(mDebugInTransaction);
1942    nsecs_t inSwapBuffersDuration = (inSwapBuffers) ? now-inSwapBuffers : 0;
1943    nsecs_t inTransactionDuration = (inTransaction) ? now-inTransaction : 0;
1944
1945    /*
1946     * Dump the visible layer list
1947     */
1948    const LayerVector& currentLayers = mCurrentState.layersSortedByZ;
1949    const size_t count = currentLayers.size();
1950    snprintf(buffer, SIZE, "Visible layers (count = %d)\n", count);
1951    result.append(buffer);
1952    for (size_t i=0 ; i<count ; i++) {
1953        const sp<LayerBase>& layer(currentLayers[i]);
1954        layer->dump(result, buffer, SIZE);
1955    }
1956
1957    /*
1958     * Dump the layers in the purgatory
1959     */
1960
1961    const size_t purgatorySize = mLayerPurgatory.size();
1962    snprintf(buffer, SIZE, "Purgatory state (%d entries)\n", purgatorySize);
1963    result.append(buffer);
1964    for (size_t i=0 ; i<purgatorySize ; i++) {
1965        const sp<LayerBase>& layer(mLayerPurgatory.itemAt(i));
1966        layer->shortDump(result, buffer, SIZE);
1967    }
1968
1969    /*
1970     * Dump Display state
1971     */
1972
1973    for (size_t dpy=0 ; dpy<mDisplays.size() ; dpy++) {
1974        const sp<const DisplayDevice>& hw(mDisplays[dpy]);
1975        snprintf(buffer, SIZE,
1976                "+ DisplayDevice[%u]\n"
1977                "   id=%x, layerStack=%u, (%4dx%4d), orient=%2d, tr=%08x, "
1978                "flips=%u, secure=%d, numLayers=%u\n",
1979                dpy,
1980                hw->getDisplayType(), hw->getLayerStack(),
1981                hw->getWidth(), hw->getHeight(),
1982                hw->getOrientation(), hw->getTransform().getType(),
1983                hw->getPageFlipCount(),
1984                hw->getSecureLayerVisible(),
1985                hw->getVisibleLayersSortedByZ().size());
1986        result.append(buffer);
1987    }
1988
1989    /*
1990     * Dump SurfaceFlinger global state
1991     */
1992
1993    snprintf(buffer, SIZE, "SurfaceFlinger global state:\n");
1994    result.append(buffer);
1995
1996    HWComposer& hwc(getHwComposer());
1997    sp<const DisplayDevice> hw(getDefaultDisplayDevice());
1998    const GLExtensions& extensions(GLExtensions::getInstance());
1999    snprintf(buffer, SIZE, "GLES: %s, %s, %s\n",
2000            extensions.getVendor(),
2001            extensions.getRenderer(),
2002            extensions.getVersion());
2003    result.append(buffer);
2004
2005    snprintf(buffer, SIZE, "EGL : %s\n",
2006            eglQueryString(mEGLDisplay, EGL_VERSION_HW_ANDROID));
2007    result.append(buffer);
2008
2009    snprintf(buffer, SIZE, "EXTS: %s\n", extensions.getExtension());
2010    result.append(buffer);
2011
2012    hw->undefinedRegion.dump(result, "undefinedRegion");
2013    snprintf(buffer, SIZE,
2014            "  orientation=%d, canDraw=%d\n",
2015            hw->getOrientation(), hw->canDraw());
2016    result.append(buffer);
2017    snprintf(buffer, SIZE,
2018            "  last eglSwapBuffers() time: %f us\n"
2019            "  last transaction time     : %f us\n"
2020            "  transaction-flags         : %08x\n"
2021            "  refresh-rate              : %f fps\n"
2022            "  x-dpi                     : %f\n"
2023            "  y-dpi                     : %f\n",
2024            mLastSwapBufferTime/1000.0,
2025            mLastTransactionTime/1000.0,
2026            mTransactionFlags,
2027            1e9 / hwc.getRefreshPeriod(),
2028            hwc.getDpiX(),
2029            hwc.getDpiY());
2030    result.append(buffer);
2031
2032    snprintf(buffer, SIZE, "  eglSwapBuffers time: %f us\n",
2033            inSwapBuffersDuration/1000.0);
2034    result.append(buffer);
2035
2036    snprintf(buffer, SIZE, "  transaction time: %f us\n",
2037            inTransactionDuration/1000.0);
2038    result.append(buffer);
2039
2040    /*
2041     * VSYNC state
2042     */
2043    mEventThread->dump(result, buffer, SIZE);
2044
2045    /*
2046     * Dump HWComposer state
2047     */
2048    snprintf(buffer, SIZE, "h/w composer state:\n");
2049    result.append(buffer);
2050    snprintf(buffer, SIZE, "  h/w composer %s and %s\n",
2051            hwc.initCheck()==NO_ERROR ? "present" : "not present",
2052                    (mDebugDisableHWC || mDebugRegion) ? "disabled" : "enabled");
2053    result.append(buffer);
2054    hwc.dump(result, buffer, SIZE, hw->getVisibleLayersSortedByZ());
2055
2056    /*
2057     * Dump gralloc state
2058     */
2059    const GraphicBufferAllocator& alloc(GraphicBufferAllocator::get());
2060    alloc.dump(result);
2061    hw->dump(result);
2062}
2063
2064status_t SurfaceFlinger::onTransact(
2065    uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
2066{
2067    switch (code) {
2068        case CREATE_CONNECTION:
2069        case SET_TRANSACTION_STATE:
2070        case BOOT_FINISHED:
2071        case BLANK:
2072        case UNBLANK:
2073        {
2074            // codes that require permission check
2075            IPCThreadState* ipc = IPCThreadState::self();
2076            const int pid = ipc->getCallingPid();
2077            const int uid = ipc->getCallingUid();
2078            if ((uid != AID_GRAPHICS) &&
2079                    !PermissionCache::checkPermission(sAccessSurfaceFlinger, pid, uid)) {
2080                ALOGE("Permission Denial: "
2081                        "can't access SurfaceFlinger pid=%d, uid=%d", pid, uid);
2082                return PERMISSION_DENIED;
2083            }
2084            break;
2085        }
2086        case CAPTURE_SCREEN:
2087        {
2088            // codes that require permission check
2089            IPCThreadState* ipc = IPCThreadState::self();
2090            const int pid = ipc->getCallingPid();
2091            const int uid = ipc->getCallingUid();
2092            if ((uid != AID_GRAPHICS) &&
2093                    !PermissionCache::checkPermission(sReadFramebuffer, pid, uid)) {
2094                ALOGE("Permission Denial: "
2095                        "can't read framebuffer pid=%d, uid=%d", pid, uid);
2096                return PERMISSION_DENIED;
2097            }
2098            break;
2099        }
2100    }
2101
2102    status_t err = BnSurfaceComposer::onTransact(code, data, reply, flags);
2103    if (err == UNKNOWN_TRANSACTION || err == PERMISSION_DENIED) {
2104        CHECK_INTERFACE(ISurfaceComposer, data, reply);
2105        if (CC_UNLIKELY(!PermissionCache::checkCallingPermission(sHardwareTest))) {
2106            IPCThreadState* ipc = IPCThreadState::self();
2107            const int pid = ipc->getCallingPid();
2108            const int uid = ipc->getCallingUid();
2109            ALOGE("Permission Denial: "
2110                    "can't access SurfaceFlinger pid=%d, uid=%d", pid, uid);
2111            return PERMISSION_DENIED;
2112        }
2113        int n;
2114        switch (code) {
2115            case 1000: // SHOW_CPU, NOT SUPPORTED ANYMORE
2116            case 1001: // SHOW_FPS, NOT SUPPORTED ANYMORE
2117                return NO_ERROR;
2118            case 1002:  // SHOW_UPDATES
2119                n = data.readInt32();
2120                mDebugRegion = n ? n : (mDebugRegion ? 0 : 1);
2121                invalidateHwcGeometry();
2122                repaintEverything();
2123                return NO_ERROR;
2124            case 1004:{ // repaint everything
2125                repaintEverything();
2126                return NO_ERROR;
2127            }
2128            case 1005:{ // force transaction
2129                setTransactionFlags(
2130                        eTransactionNeeded|
2131                        eDisplayTransactionNeeded|
2132                        eTraversalNeeded);
2133                return NO_ERROR;
2134            }
2135            case 1006:{ // send empty update
2136                signalRefresh();
2137                return NO_ERROR;
2138            }
2139            case 1008:  // toggle use of hw composer
2140                n = data.readInt32();
2141                mDebugDisableHWC = n ? 1 : 0;
2142                invalidateHwcGeometry();
2143                repaintEverything();
2144                return NO_ERROR;
2145            case 1009:  // toggle use of transform hint
2146                n = data.readInt32();
2147                mDebugDisableTransformHint = n ? 1 : 0;
2148                invalidateHwcGeometry();
2149                repaintEverything();
2150                return NO_ERROR;
2151            case 1010:  // interrogate.
2152                reply->writeInt32(0);
2153                reply->writeInt32(0);
2154                reply->writeInt32(mDebugRegion);
2155                reply->writeInt32(0);
2156                reply->writeInt32(mDebugDisableHWC);
2157                return NO_ERROR;
2158            case 1013: {
2159                Mutex::Autolock _l(mStateLock);
2160                sp<const DisplayDevice> hw(getDefaultDisplayDevice());
2161                reply->writeInt32(hw->getPageFlipCount());
2162            }
2163            return NO_ERROR;
2164        }
2165    }
2166    return err;
2167}
2168
2169void SurfaceFlinger::repaintEverything() {
2170    android_atomic_or(1, &mRepaintEverything);
2171    signalTransaction();
2172}
2173
2174// ---------------------------------------------------------------------------
2175
2176status_t SurfaceFlinger::renderScreenToTexture(uint32_t layerStack,
2177        GLuint* textureName, GLfloat* uOut, GLfloat* vOut)
2178{
2179    Mutex::Autolock _l(mStateLock);
2180    return renderScreenToTextureLocked(layerStack, textureName, uOut, vOut);
2181}
2182
2183status_t SurfaceFlinger::renderScreenToTextureLocked(uint32_t layerStack,
2184        GLuint* textureName, GLfloat* uOut, GLfloat* vOut)
2185{
2186    ATRACE_CALL();
2187
2188    if (!GLExtensions::getInstance().haveFramebufferObject())
2189        return INVALID_OPERATION;
2190
2191    // get screen geometry
2192    // FIXME: figure out what it means to have a screenshot texture w/ multi-display
2193    sp<const DisplayDevice> hw(getDefaultDisplayDevice());
2194    const uint32_t hw_w = hw->getWidth();
2195    const uint32_t hw_h = hw->getHeight();
2196    GLfloat u = 1;
2197    GLfloat v = 1;
2198
2199    // make sure to clear all GL error flags
2200    while ( glGetError() != GL_NO_ERROR ) ;
2201
2202    // create a FBO
2203    GLuint name, tname;
2204    glGenTextures(1, &tname);
2205    glBindTexture(GL_TEXTURE_2D, tname);
2206    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
2207    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
2208    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB,
2209            hw_w, hw_h, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
2210    if (glGetError() != GL_NO_ERROR) {
2211        while ( glGetError() != GL_NO_ERROR ) ;
2212        GLint tw = (2 << (31 - clz(hw_w)));
2213        GLint th = (2 << (31 - clz(hw_h)));
2214        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB,
2215                tw, th, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
2216        u = GLfloat(hw_w) / tw;
2217        v = GLfloat(hw_h) / th;
2218    }
2219    glGenFramebuffersOES(1, &name);
2220    glBindFramebufferOES(GL_FRAMEBUFFER_OES, name);
2221    glFramebufferTexture2DOES(GL_FRAMEBUFFER_OES,
2222            GL_COLOR_ATTACHMENT0_OES, GL_TEXTURE_2D, tname, 0);
2223
2224    // redraw the screen entirely...
2225    glDisable(GL_TEXTURE_EXTERNAL_OES);
2226    glDisable(GL_TEXTURE_2D);
2227    glClearColor(0,0,0,1);
2228    glClear(GL_COLOR_BUFFER_BIT);
2229    glMatrixMode(GL_MODELVIEW);
2230    glLoadIdentity();
2231    const Vector< sp<LayerBase> >& layers(hw->getVisibleLayersSortedByZ());
2232    const size_t count = layers.size();
2233    for (size_t i=0 ; i<count ; ++i) {
2234        const sp<LayerBase>& layer(layers[i]);
2235        layer->draw(hw);
2236    }
2237
2238    hw->compositionComplete();
2239
2240    // back to main framebuffer
2241    glBindFramebufferOES(GL_FRAMEBUFFER_OES, 0);
2242    glDeleteFramebuffersOES(1, &name);
2243
2244    *textureName = tname;
2245    *uOut = u;
2246    *vOut = v;
2247    return NO_ERROR;
2248}
2249
2250// ---------------------------------------------------------------------------
2251
2252status_t SurfaceFlinger::captureScreenImplLocked(const sp<IBinder>& display,
2253        sp<IMemoryHeap>* heap,
2254        uint32_t* w, uint32_t* h, PixelFormat* f,
2255        uint32_t sw, uint32_t sh,
2256        uint32_t minLayerZ, uint32_t maxLayerZ)
2257{
2258    ATRACE_CALL();
2259
2260    status_t result = PERMISSION_DENIED;
2261
2262    if (!GLExtensions::getInstance().haveFramebufferObject()) {
2263        return INVALID_OPERATION;
2264    }
2265
2266    // get screen geometry
2267    sp<const DisplayDevice> hw(getDisplayDevice(display));
2268    const uint32_t hw_w = hw->getWidth();
2269    const uint32_t hw_h = hw->getHeight();
2270
2271    // if we have secure windows on this display, never allow the screen capture
2272    if (hw->getSecureLayerVisible()) {
2273        ALOGW("FB is protected: PERMISSION_DENIED");
2274        return PERMISSION_DENIED;
2275    }
2276
2277    if ((sw > hw_w) || (sh > hw_h)) {
2278        ALOGE("size mismatch (%d, %d) > (%d, %d)", sw, sh, hw_w, hw_h);
2279        return BAD_VALUE;
2280    }
2281
2282    sw = (!sw) ? hw_w : sw;
2283    sh = (!sh) ? hw_h : sh;
2284    const size_t size = sw * sh * 4;
2285    const bool filtering = sw != hw_w || sh != hw_h;
2286
2287//    ALOGD("screenshot: sw=%d, sh=%d, minZ=%d, maxZ=%d",
2288//            sw, sh, minLayerZ, maxLayerZ);
2289
2290    // make sure to clear all GL error flags
2291    while ( glGetError() != GL_NO_ERROR ) ;
2292
2293    // create a FBO
2294    GLuint name, tname;
2295    glGenRenderbuffersOES(1, &tname);
2296    glBindRenderbufferOES(GL_RENDERBUFFER_OES, tname);
2297    glRenderbufferStorageOES(GL_RENDERBUFFER_OES, GL_RGBA8_OES, sw, sh);
2298
2299    glGenFramebuffersOES(1, &name);
2300    glBindFramebufferOES(GL_FRAMEBUFFER_OES, name);
2301    glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES,
2302            GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, tname);
2303
2304    GLenum status = glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES);
2305
2306    if (status == GL_FRAMEBUFFER_COMPLETE_OES) {
2307
2308        // invert everything, b/c glReadPixel() below will invert the FB
2309        glViewport(0, 0, sw, sh);
2310        glMatrixMode(GL_PROJECTION);
2311        glPushMatrix();
2312        glLoadIdentity();
2313        glOrthof(0, hw_w, hw_h, 0, 0, 1);
2314        glMatrixMode(GL_MODELVIEW);
2315
2316        // redraw the screen entirely...
2317        glClearColor(0,0,0,1);
2318        glClear(GL_COLOR_BUFFER_BIT);
2319
2320        const Vector< sp<LayerBase> >& layers(hw->getVisibleLayersSortedByZ());
2321        const size_t count = layers.size();
2322        for (size_t i=0 ; i<count ; ++i) {
2323            const sp<LayerBase>& layer(layers[i]);
2324            const uint32_t z = layer->drawingState().z;
2325            if (z >= minLayerZ && z <= maxLayerZ) {
2326                if (filtering) layer->setFiltering(true);
2327                layer->draw(hw);
2328                if (filtering) layer->setFiltering(false);
2329            }
2330        }
2331
2332        // check for errors and return screen capture
2333        if (glGetError() != GL_NO_ERROR) {
2334            // error while rendering
2335            result = INVALID_OPERATION;
2336        } else {
2337            // allocate shared memory large enough to hold the
2338            // screen capture
2339            sp<MemoryHeapBase> base(
2340                    new MemoryHeapBase(size, 0, "screen-capture") );
2341            void* const ptr = base->getBase();
2342            if (ptr) {
2343                // capture the screen with glReadPixels()
2344                ScopedTrace _t(ATRACE_TAG, "glReadPixels");
2345                glReadPixels(0, 0, sw, sh, GL_RGBA, GL_UNSIGNED_BYTE, ptr);
2346                if (glGetError() == GL_NO_ERROR) {
2347                    *heap = base;
2348                    *w = sw;
2349                    *h = sh;
2350                    *f = PIXEL_FORMAT_RGBA_8888;
2351                    result = NO_ERROR;
2352                }
2353            } else {
2354                result = NO_MEMORY;
2355            }
2356        }
2357        glViewport(0, 0, hw_w, hw_h);
2358        glMatrixMode(GL_PROJECTION);
2359        glPopMatrix();
2360        glMatrixMode(GL_MODELVIEW);
2361    } else {
2362        result = BAD_VALUE;
2363    }
2364
2365    // release FBO resources
2366    glBindFramebufferOES(GL_FRAMEBUFFER_OES, 0);
2367    glDeleteRenderbuffersOES(1, &tname);
2368    glDeleteFramebuffersOES(1, &name);
2369
2370    hw->compositionComplete();
2371
2372//    ALOGD("screenshot: result = %s", result<0 ? strerror(result) : "OK");
2373
2374    return result;
2375}
2376
2377
2378status_t SurfaceFlinger::captureScreen(const sp<IBinder>& display,
2379        sp<IMemoryHeap>* heap,
2380        uint32_t* width, uint32_t* height, PixelFormat* format,
2381        uint32_t sw, uint32_t sh,
2382        uint32_t minLayerZ, uint32_t maxLayerZ)
2383{
2384    if (CC_UNLIKELY(display == 0))
2385        return BAD_VALUE;
2386
2387    if (!GLExtensions::getInstance().haveFramebufferObject())
2388        return INVALID_OPERATION;
2389
2390    class MessageCaptureScreen : public MessageBase {
2391        SurfaceFlinger* flinger;
2392        sp<IBinder> display;
2393        sp<IMemoryHeap>* heap;
2394        uint32_t* w;
2395        uint32_t* h;
2396        PixelFormat* f;
2397        uint32_t sw;
2398        uint32_t sh;
2399        uint32_t minLayerZ;
2400        uint32_t maxLayerZ;
2401        status_t result;
2402    public:
2403        MessageCaptureScreen(SurfaceFlinger* flinger, const sp<IBinder>& display,
2404                sp<IMemoryHeap>* heap, uint32_t* w, uint32_t* h, PixelFormat* f,
2405                uint32_t sw, uint32_t sh,
2406                uint32_t minLayerZ, uint32_t maxLayerZ)
2407            : flinger(flinger), display(display),
2408              heap(heap), w(w), h(h), f(f), sw(sw), sh(sh),
2409              minLayerZ(minLayerZ), maxLayerZ(maxLayerZ),
2410              result(PERMISSION_DENIED)
2411        {
2412        }
2413        status_t getResult() const {
2414            return result;
2415        }
2416        virtual bool handler() {
2417            Mutex::Autolock _l(flinger->mStateLock);
2418            result = flinger->captureScreenImplLocked(display,
2419                    heap, w, h, f, sw, sh, minLayerZ, maxLayerZ);
2420            return true;
2421        }
2422    };
2423
2424    sp<MessageBase> msg = new MessageCaptureScreen(this,
2425            display, heap, width, height, format, sw, sh, minLayerZ, maxLayerZ);
2426    status_t res = postMessageSync(msg);
2427    if (res == NO_ERROR) {
2428        res = static_cast<MessageCaptureScreen*>( msg.get() )->getResult();
2429    }
2430    return res;
2431}
2432
2433// ---------------------------------------------------------------------------
2434
2435SurfaceFlinger::LayerVector::LayerVector() {
2436}
2437
2438SurfaceFlinger::LayerVector::LayerVector(const LayerVector& rhs)
2439    : SortedVector<sp<LayerBase> >(rhs) {
2440}
2441
2442int SurfaceFlinger::LayerVector::do_compare(const void* lhs,
2443    const void* rhs) const
2444{
2445    // sort layers per layer-stack, then by z-order and finally by sequence
2446    const sp<LayerBase>& l(*reinterpret_cast<const sp<LayerBase>*>(lhs));
2447    const sp<LayerBase>& r(*reinterpret_cast<const sp<LayerBase>*>(rhs));
2448
2449    uint32_t ls = l->currentState().layerStack;
2450    uint32_t rs = r->currentState().layerStack;
2451    if (ls != rs)
2452        return ls - rs;
2453
2454    uint32_t lz = l->currentState().z;
2455    uint32_t rz = r->currentState().z;
2456    if (lz != rz)
2457        return lz - rz;
2458
2459    return l->sequence - r->sequence;
2460}
2461
2462// ---------------------------------------------------------------------------
2463
2464SurfaceFlinger::DisplayDeviceState::DisplayDeviceState()
2465    : type(DisplayDevice::DISPLAY_ID_INVALID) {
2466}
2467
2468SurfaceFlinger::DisplayDeviceState::DisplayDeviceState(DisplayDevice::DisplayType type)
2469    : type(type), layerStack(0), orientation(0) {
2470}
2471
2472// ---------------------------------------------------------------------------
2473
2474GraphicBufferAlloc::GraphicBufferAlloc() {}
2475
2476GraphicBufferAlloc::~GraphicBufferAlloc() {}
2477
2478sp<GraphicBuffer> GraphicBufferAlloc::createGraphicBuffer(uint32_t w, uint32_t h,
2479        PixelFormat format, uint32_t usage, status_t* error) {
2480    sp<GraphicBuffer> graphicBuffer(new GraphicBuffer(w, h, format, usage));
2481    status_t err = graphicBuffer->initCheck();
2482    *error = err;
2483    if (err != 0 || graphicBuffer->handle == 0) {
2484        if (err == NO_MEMORY) {
2485            GraphicBuffer::dumpAllocationsToSystemLog();
2486        }
2487        ALOGE("GraphicBufferAlloc::createGraphicBuffer(w=%d, h=%d) "
2488             "failed (%s), handle=%p",
2489                w, h, strerror(-err), graphicBuffer->handle);
2490        return 0;
2491    }
2492    return graphicBuffer;
2493}
2494
2495// ---------------------------------------------------------------------------
2496
2497}; // namespace android
2498