SurfaceFlinger.cpp revision 7e7ed7f77a3963a3542bde529d2797a239e2798b 
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            const 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
969                        sp<SurfaceTextureClient> stc(
970                                new SurfaceTextureClient(state.surface));
971                        sp<DisplayDevice> disp = new DisplayDevice(this,
972                            state.type, display, stc, NULL, mEGLConfig);
973
974                        disp->setLayerStack(state.layerStack);
975                        disp->setOrientation(state.orientation);
976                        // TODO: take viewport and frame into account
977                        mDisplays.replaceValueFor(display, disp);
978                    }
979                    if (state.layerStack != draw[i].layerStack) {
980                        const sp<DisplayDevice>& disp(getDisplayDevice(display));
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                        const sp<DisplayDevice>& disp(getDisplayDevice(display));
987                        disp->setOrientation(state.orientation);
988                        // TODO: take viewport and frame into account
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                    sp<SurfaceTextureClient> stc(
999                            new SurfaceTextureClient(state.surface));
1000                    const wp<IBinder>& display(curr.keyAt(i));
1001                    sp<DisplayDevice> disp = new DisplayDevice(this,
1002                        state.type, display, stc, 0, mEGLConfig);
1003                    mDisplays.add(display, disp);
1004                }
1005            }
1006        }
1007    }
1008
1009    /*
1010     * Perform our own transaction if needed
1011     */
1012
1013    const LayerVector& previousLayers(mDrawingState.layersSortedByZ);
1014    if (currentLayers.size() > previousLayers.size()) {
1015        // layers have been added
1016        mVisibleRegionsDirty = true;
1017    }
1018
1019    // some layers might have been removed, so
1020    // we need to update the regions they're exposing.
1021    if (mLayersRemoved) {
1022        mLayersRemoved = false;
1023        mVisibleRegionsDirty = true;
1024        const size_t count = previousLayers.size();
1025        for (size_t i=0 ; i<count ; i++) {
1026            const sp<LayerBase>& layer(previousLayers[i]);
1027            if (currentLayers.indexOf(layer) < 0) {
1028                // this layer is not visible anymore
1029                // TODO: we could traverse the tree from front to back and
1030                //       compute the actual visible region
1031                // TODO: we could cache the transformed region
1032                Layer::State front(layer->drawingState());
1033                Region visibleReg = front.transform.transform(
1034                        Region(Rect(front.active.w, front.active.h)));
1035                invalidateLayerStack(front.layerStack, visibleReg);
1036            }
1037        }
1038    }
1039
1040    commitTransaction();
1041}
1042
1043void SurfaceFlinger::commitTransaction()
1044{
1045    if (!mLayersPendingRemoval.isEmpty()) {
1046        // Notify removed layers now that they can't be drawn from
1047        for (size_t i = 0; i < mLayersPendingRemoval.size(); i++) {
1048            mLayersPendingRemoval[i]->onRemoved();
1049        }
1050        mLayersPendingRemoval.clear();
1051    }
1052
1053    mDrawingState = mCurrentState;
1054    mTransationPending = false;
1055    mTransactionCV.broadcast();
1056}
1057
1058void SurfaceFlinger::computeVisibleRegions(
1059        const LayerVector& currentLayers, uint32_t layerStack,
1060        Region& outDirtyRegion, Region& outOpaqueRegion)
1061{
1062    ATRACE_CALL();
1063
1064    Region aboveOpaqueLayers;
1065    Region aboveCoveredLayers;
1066    Region dirty;
1067
1068    outDirtyRegion.clear();
1069
1070    size_t i = currentLayers.size();
1071    while (i--) {
1072        const sp<LayerBase>& layer = currentLayers[i];
1073
1074        // start with the whole surface at its current location
1075        const Layer::State& s(layer->drawingState());
1076
1077        // only consider the layers on the given later stack
1078        if (s.layerStack != layerStack)
1079            continue;
1080
1081        /*
1082         * opaqueRegion: area of a surface that is fully opaque.
1083         */
1084        Region opaqueRegion;
1085
1086        /*
1087         * visibleRegion: area of a surface that is visible on screen
1088         * and not fully transparent. This is essentially the layer's
1089         * footprint minus the opaque regions above it.
1090         * Areas covered by a translucent surface are considered visible.
1091         */
1092        Region visibleRegion;
1093
1094        /*
1095         * coveredRegion: area of a surface that is covered by all
1096         * visible regions above it (which includes the translucent areas).
1097         */
1098        Region coveredRegion;
1099
1100
1101        // handle hidden surfaces by setting the visible region to empty
1102        if (CC_LIKELY(!(s.flags & layer_state_t::eLayerHidden) && s.alpha)) {
1103            const bool translucent = !layer->isOpaque();
1104            Rect bounds(layer->computeBounds());
1105            visibleRegion.set(bounds);
1106            if (!visibleRegion.isEmpty()) {
1107                // Remove the transparent area from the visible region
1108                if (translucent) {
1109                    Region transparentRegionScreen;
1110                    const Transform tr(s.transform);
1111                    if (tr.transformed()) {
1112                        if (tr.preserveRects()) {
1113                            // transform the transparent region
1114                            transparentRegionScreen = tr.transform(s.transparentRegion);
1115                        } else {
1116                            // transformation too complex, can't do the
1117                            // transparent region optimization.
1118                            transparentRegionScreen.clear();
1119                        }
1120                    } else {
1121                        transparentRegionScreen = s.transparentRegion;
1122                    }
1123                    visibleRegion.subtractSelf(transparentRegionScreen);
1124                }
1125
1126                // compute the opaque region
1127                const int32_t layerOrientation = s.transform.getOrientation();
1128                if (s.alpha==255 && !translucent &&
1129                        ((layerOrientation & Transform::ROT_INVALID) == false)) {
1130                    // the opaque region is the layer's footprint
1131                    opaqueRegion = visibleRegion;
1132                }
1133            }
1134        }
1135
1136        // Clip the covered region to the visible region
1137        coveredRegion = aboveCoveredLayers.intersect(visibleRegion);
1138
1139        // Update aboveCoveredLayers for next (lower) layer
1140        aboveCoveredLayers.orSelf(visibleRegion);
1141
1142        // subtract the opaque region covered by the layers above us
1143        visibleRegion.subtractSelf(aboveOpaqueLayers);
1144
1145        // compute this layer's dirty region
1146        if (layer->contentDirty) {
1147            // we need to invalidate the whole region
1148            dirty = visibleRegion;
1149            // as well, as the old visible region
1150            dirty.orSelf(layer->visibleRegion);
1151            layer->contentDirty = false;
1152        } else {
1153            /* compute the exposed region:
1154             *   the exposed region consists of two components:
1155             *   1) what's VISIBLE now and was COVERED before
1156             *   2) what's EXPOSED now less what was EXPOSED before
1157             *
1158             * note that (1) is conservative, we start with the whole
1159             * visible region but only keep what used to be covered by
1160             * something -- which mean it may have been exposed.
1161             *
1162             * (2) handles areas that were not covered by anything but got
1163             * exposed because of a resize.
1164             */
1165            const Region newExposed = visibleRegion - coveredRegion;
1166            const Region oldVisibleRegion = layer->visibleRegion;
1167            const Region oldCoveredRegion = layer->coveredRegion;
1168            const Region oldExposed = oldVisibleRegion - oldCoveredRegion;
1169            dirty = (visibleRegion&oldCoveredRegion) | (newExposed-oldExposed);
1170        }
1171        dirty.subtractSelf(aboveOpaqueLayers);
1172
1173        // accumulate to the screen dirty region
1174        outDirtyRegion.orSelf(dirty);
1175
1176        // Update aboveOpaqueLayers for next (lower) layer
1177        aboveOpaqueLayers.orSelf(opaqueRegion);
1178
1179        // Store the visible region is screen space
1180        layer->setVisibleRegion(visibleRegion);
1181        layer->setCoveredRegion(coveredRegion);
1182    }
1183
1184    outOpaqueRegion = aboveOpaqueLayers;
1185}
1186
1187void SurfaceFlinger::invalidateLayerStack(uint32_t layerStack,
1188        const Region& dirty) {
1189    for (size_t dpy=0 ; dpy<mDisplays.size() ; dpy++) {
1190        const sp<DisplayDevice>& hw(mDisplays[dpy]);
1191        if (hw->getLayerStack() == layerStack) {
1192            hw->dirtyRegion.orSelf(dirty);
1193        }
1194    }
1195}
1196
1197void SurfaceFlinger::handlePageFlip()
1198{
1199    Region dirtyRegion;
1200
1201    bool visibleRegions = false;
1202    const LayerVector& currentLayers(mDrawingState.layersSortedByZ);
1203    const size_t count = currentLayers.size();
1204    for (size_t i=0 ; i<count ; i++) {
1205        const sp<LayerBase>& layer(currentLayers[i]);
1206        const Region dirty(layer->latchBuffer(visibleRegions));
1207        Layer::State s(layer->drawingState());
1208        invalidateLayerStack(s.layerStack, dirty);
1209    }
1210
1211    mVisibleRegionsDirty |= visibleRegions;
1212}
1213
1214void SurfaceFlinger::invalidateHwcGeometry()
1215{
1216    mHwWorkListDirty = true;
1217}
1218
1219
1220void SurfaceFlinger::doDisplayComposition(const sp<const DisplayDevice>& hw,
1221        const Region& inDirtyRegion)
1222{
1223    Region dirtyRegion(inDirtyRegion);
1224
1225    // compute the invalid region
1226    hw->swapRegion.orSelf(dirtyRegion);
1227
1228    uint32_t flags = hw->getFlags();
1229    if (flags & DisplayDevice::SWAP_RECTANGLE) {
1230        // we can redraw only what's dirty, but since SWAP_RECTANGLE only
1231        // takes a rectangle, we must make sure to update that whole
1232        // rectangle in that case
1233        dirtyRegion.set(hw->swapRegion.bounds());
1234    } else {
1235        if (flags & DisplayDevice::PARTIAL_UPDATES) {
1236            // We need to redraw the rectangle that will be updated
1237            // (pushed to the framebuffer).
1238            // This is needed because PARTIAL_UPDATES only takes one
1239            // rectangle instead of a region (see DisplayDevice::flip())
1240            dirtyRegion.set(hw->swapRegion.bounds());
1241        } else {
1242            // we need to redraw everything (the whole screen)
1243            dirtyRegion.set(hw->bounds());
1244            hw->swapRegion = dirtyRegion;
1245        }
1246    }
1247
1248    doComposeSurfaces(hw, dirtyRegion);
1249
1250    // FIXME: we need to call eglSwapBuffers() on displays that have
1251    // GL composition and only on those.
1252    // however, currently hwc.commit() already does that for the main
1253    // display and never for the other ones
1254    if (hw->getDisplayType() >= DisplayDevice::DISPLAY_VIRTUAL) {
1255        // FIXME: EGL spec says:
1256        //   "surface must be bound to the calling thread's current context,
1257        //    for the current rendering API."
1258        eglSwapBuffers(mEGLDisplay, hw->getEGLSurface());
1259    }
1260
1261    // update the swap region and clear the dirty region
1262    hw->swapRegion.orSelf(dirtyRegion);
1263}
1264
1265void SurfaceFlinger::doComposeSurfaces(const sp<const DisplayDevice>& hw, const Region& dirty)
1266{
1267    HWComposer& hwc(getHwComposer());
1268    int32_t id = hw->getHwcDisplayId();
1269    HWComposer::LayerListIterator cur = hwc.begin(id);
1270    const HWComposer::LayerListIterator end = hwc.end(id);
1271
1272    const bool hasGlesComposition = hwc.hasGlesComposition(id);
1273    const bool hasHwcComposition = hwc.hasHwcComposition(id);
1274    if (cur==end || hasGlesComposition) {
1275
1276        DisplayDevice::makeCurrent(hw, mEGLContext);
1277
1278        // set the frame buffer
1279        glMatrixMode(GL_MODELVIEW);
1280        glLoadIdentity();
1281
1282        // Never touch the framebuffer if we don't have any framebuffer layers
1283        if (hasHwcComposition) {
1284            // when using overlays, we assume a fully transparent framebuffer
1285            // NOTE: we could reduce how much we need to clear, for instance
1286            // remove where there are opaque FB layers. however, on some
1287            // GPUs doing a "clean slate" glClear might be more efficient.
1288            // We'll revisit later if needed.
1289            glClearColor(0, 0, 0, 0);
1290            glClear(GL_COLOR_BUFFER_BIT);
1291        } else {
1292            const Region region(hw->undefinedRegion.intersect(dirty));
1293            // screen is already cleared here
1294            if (!region.isEmpty()) {
1295                // can happen with SurfaceView
1296                drawWormhole(hw, region);
1297            }
1298        }
1299
1300        /*
1301         * and then, render the layers targeted at the framebuffer
1302         */
1303
1304        const Vector< sp<LayerBase> >& layers(hw->getVisibleLayersSortedByZ());
1305        const size_t count = layers.size();
1306        const Transform& tr = hw->getTransform();
1307        for (size_t i=0 ; i<count ; ++i) {
1308            const sp<LayerBase>& layer(layers[i]);
1309            const Region clip(dirty.intersect(tr.transform(layer->visibleRegion)));
1310            if (cur != end) {
1311                // we're using h/w composer
1312                if (!clip.isEmpty()) {
1313                    if (cur->getCompositionType() == HWC_OVERLAY) {
1314                        if (i && (cur->getHints() & HWC_HINT_CLEAR_FB)
1315                                && layer->isOpaque()) {
1316                            // never clear the very first layer since we're
1317                            // guaranteed the FB is already cleared
1318                            layer->clearWithOpenGL(hw, clip);
1319                        }
1320                    } else {
1321                        layer->draw(hw, clip);
1322                    }
1323                    layer->setAcquireFence(hw, *cur);
1324                }
1325                ++cur;
1326            } else {
1327                // we're not using h/w composer
1328                if (!clip.isEmpty()) {
1329                    layer->draw(hw, clip);
1330                }
1331            }
1332        }
1333    }
1334}
1335
1336void SurfaceFlinger::drawWormhole(const sp<const DisplayDevice>& hw,
1337        const Region& region) const
1338{
1339    glDisable(GL_TEXTURE_EXTERNAL_OES);
1340    glDisable(GL_TEXTURE_2D);
1341    glDisable(GL_BLEND);
1342    glColor4f(0,0,0,0);
1343
1344    const int32_t height = hw->getHeight();
1345    Region::const_iterator it = region.begin();
1346    Region::const_iterator const end = region.end();
1347    while (it != end) {
1348        const Rect& r = *it++;
1349        GLfloat vertices[][2] = {
1350                { r.left,  height - r.top },
1351                { r.left,  height - r.bottom },
1352                { r.right, height - r.bottom },
1353                { r.right, height - r.top }
1354        };
1355        glVertexPointer(2, GL_FLOAT, 0, vertices);
1356        glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
1357    }
1358}
1359
1360ssize_t SurfaceFlinger::addClientLayer(const sp<Client>& client,
1361        const sp<LayerBaseClient>& lbc)
1362{
1363    // attach this layer to the client
1364    size_t name = client->attachLayer(lbc);
1365
1366    // add this layer to the current state list
1367    Mutex::Autolock _l(mStateLock);
1368    mCurrentState.layersSortedByZ.add(lbc);
1369
1370    return ssize_t(name);
1371}
1372
1373status_t SurfaceFlinger::removeLayer(const sp<LayerBase>& layer)
1374{
1375    Mutex::Autolock _l(mStateLock);
1376    status_t err = purgatorizeLayer_l(layer);
1377    if (err == NO_ERROR)
1378        setTransactionFlags(eTransactionNeeded);
1379    return err;
1380}
1381
1382status_t SurfaceFlinger::removeLayer_l(const sp<LayerBase>& layerBase)
1383{
1384    ssize_t index = mCurrentState.layersSortedByZ.remove(layerBase);
1385    if (index >= 0) {
1386        mLayersRemoved = true;
1387        return NO_ERROR;
1388    }
1389    return status_t(index);
1390}
1391
1392status_t SurfaceFlinger::purgatorizeLayer_l(const sp<LayerBase>& layerBase)
1393{
1394    // First add the layer to the purgatory list, which makes sure it won't
1395    // go away, then remove it from the main list (through a transaction).
1396    ssize_t err = removeLayer_l(layerBase);
1397    if (err >= 0) {
1398        mLayerPurgatory.add(layerBase);
1399    }
1400
1401    mLayersPendingRemoval.push(layerBase);
1402
1403    // it's possible that we don't find a layer, because it might
1404    // have been destroyed already -- this is not technically an error
1405    // from the user because there is a race between Client::destroySurface(),
1406    // ~Client() and ~ISurface().
1407    return (err == NAME_NOT_FOUND) ? status_t(NO_ERROR) : err;
1408}
1409
1410uint32_t SurfaceFlinger::peekTransactionFlags(uint32_t flags)
1411{
1412    return android_atomic_release_load(&mTransactionFlags);
1413}
1414
1415uint32_t SurfaceFlinger::getTransactionFlags(uint32_t flags)
1416{
1417    return android_atomic_and(~flags, &mTransactionFlags) & flags;
1418}
1419
1420uint32_t SurfaceFlinger::setTransactionFlags(uint32_t flags)
1421{
1422    uint32_t old = android_atomic_or(flags, &mTransactionFlags);
1423    if ((old & flags)==0) { // wake the server up
1424        signalTransaction();
1425    }
1426    return old;
1427}
1428
1429void SurfaceFlinger::setTransactionState(
1430        const Vector<ComposerState>& state,
1431        const Vector<DisplayState>& displays,
1432        uint32_t flags)
1433{
1434    Mutex::Autolock _l(mStateLock);
1435    uint32_t transactionFlags = 0;
1436
1437    size_t count = displays.size();
1438    for (size_t i=0 ; i<count ; i++) {
1439        const DisplayState& s(displays[i]);
1440        transactionFlags |= setDisplayStateLocked(s);
1441    }
1442
1443    count = state.size();
1444    for (size_t i=0 ; i<count ; i++) {
1445        const ComposerState& s(state[i]);
1446        sp<Client> client( static_cast<Client *>(s.client.get()) );
1447        transactionFlags |= setClientStateLocked(client, s.state);
1448    }
1449
1450    if (transactionFlags) {
1451        // this triggers the transaction
1452        setTransactionFlags(transactionFlags);
1453
1454        // if this is a synchronous transaction, wait for it to take effect
1455        // before returning.
1456        if (flags & eSynchronous) {
1457            mTransationPending = true;
1458        }
1459        while (mTransationPending) {
1460            status_t err = mTransactionCV.waitRelative(mStateLock, s2ns(5));
1461            if (CC_UNLIKELY(err != NO_ERROR)) {
1462                // just in case something goes wrong in SF, return to the
1463                // called after a few seconds.
1464                ALOGW_IF(err == TIMED_OUT, "closeGlobalTransaction timed out!");
1465                mTransationPending = false;
1466                break;
1467            }
1468        }
1469    }
1470}
1471
1472uint32_t SurfaceFlinger::setDisplayStateLocked(const DisplayState& s)
1473{
1474    uint32_t flags = 0;
1475    DisplayDeviceState& disp(mCurrentState.displays.editValueFor(s.token));
1476    if (disp.isValid()) {
1477        const uint32_t what = s.what;
1478        if (what & DisplayState::eSurfaceChanged) {
1479            if (disp.surface->asBinder() != s.surface->asBinder()) {
1480                disp.surface = s.surface;
1481                flags |= eDisplayTransactionNeeded;
1482            }
1483        }
1484        if (what & DisplayState::eLayerStackChanged) {
1485            if (disp.layerStack != s.layerStack) {
1486                disp.layerStack = s.layerStack;
1487                flags |= eDisplayTransactionNeeded;
1488            }
1489        }
1490        if (what & DisplayState::eOrientationChanged) {
1491            if (disp.orientation != s.orientation) {
1492                disp.orientation = s.orientation;
1493                flags |= eDisplayTransactionNeeded;
1494            }
1495        }
1496        if (what & DisplayState::eFrameChanged) {
1497            if (disp.frame != s.frame) {
1498                disp.frame = s.frame;
1499                flags |= eDisplayTransactionNeeded;
1500            }
1501        }
1502        if (what & DisplayState::eViewportChanged) {
1503            if (disp.viewport != s.viewport) {
1504                disp.viewport = s.viewport;
1505                flags |= eDisplayTransactionNeeded;
1506            }
1507        }
1508    }
1509    return flags;
1510}
1511
1512uint32_t SurfaceFlinger::setClientStateLocked(
1513        const sp<Client>& client,
1514        const layer_state_t& s)
1515{
1516    uint32_t flags = 0;
1517    sp<LayerBaseClient> layer(client->getLayerUser(s.surface));
1518    if (layer != 0) {
1519        const uint32_t what = s.what;
1520        if (what & layer_state_t::ePositionChanged) {
1521            if (layer->setPosition(s.x, s.y))
1522                flags |= eTraversalNeeded;
1523        }
1524        if (what & layer_state_t::eLayerChanged) {
1525            // NOTE: index needs to be calculated before we update the state
1526            ssize_t idx = mCurrentState.layersSortedByZ.indexOf(layer);
1527            if (layer->setLayer(s.z)) {
1528                mCurrentState.layersSortedByZ.removeAt(idx);
1529                mCurrentState.layersSortedByZ.add(layer);
1530                // we need traversal (state changed)
1531                // AND transaction (list changed)
1532                flags |= eTransactionNeeded|eTraversalNeeded;
1533            }
1534        }
1535        if (what & layer_state_t::eSizeChanged) {
1536            if (layer->setSize(s.w, s.h)) {
1537                flags |= eTraversalNeeded;
1538            }
1539        }
1540        if (what & layer_state_t::eAlphaChanged) {
1541            if (layer->setAlpha(uint8_t(255.0f*s.alpha+0.5f)))
1542                flags |= eTraversalNeeded;
1543        }
1544        if (what & layer_state_t::eMatrixChanged) {
1545            if (layer->setMatrix(s.matrix))
1546                flags |= eTraversalNeeded;
1547        }
1548        if (what & layer_state_t::eTransparentRegionChanged) {
1549            if (layer->setTransparentRegionHint(s.transparentRegion))
1550                flags |= eTraversalNeeded;
1551        }
1552        if (what & layer_state_t::eVisibilityChanged) {
1553            if (layer->setFlags(s.flags, s.mask))
1554                flags |= eTraversalNeeded;
1555        }
1556        if (what & layer_state_t::eCropChanged) {
1557            if (layer->setCrop(s.crop))
1558                flags |= eTraversalNeeded;
1559        }
1560        if (what & layer_state_t::eLayerStackChanged) {
1561            // NOTE: index needs to be calculated before we update the state
1562            ssize_t idx = mCurrentState.layersSortedByZ.indexOf(layer);
1563            if (layer->setLayerStack(s.layerStack)) {
1564                mCurrentState.layersSortedByZ.removeAt(idx);
1565                mCurrentState.layersSortedByZ.add(layer);
1566                // we need traversal (state changed)
1567                // AND transaction (list changed)
1568                flags |= eTransactionNeeded|eTraversalNeeded;
1569            }
1570        }
1571    }
1572    return flags;
1573}
1574
1575sp<ISurface> SurfaceFlinger::createLayer(
1576        ISurfaceComposerClient::surface_data_t* params,
1577        const String8& name,
1578        const sp<Client>& client,
1579       uint32_t w, uint32_t h, PixelFormat format,
1580        uint32_t flags)
1581{
1582    sp<LayerBaseClient> layer;
1583    sp<ISurface> surfaceHandle;
1584
1585    if (int32_t(w|h) < 0) {
1586        ALOGE("createLayer() failed, w or h is negative (w=%d, h=%d)",
1587                int(w), int(h));
1588        return surfaceHandle;
1589    }
1590
1591    //ALOGD("createLayer for (%d x %d), name=%s", w, h, name.string());
1592    switch (flags & ISurfaceComposerClient::eFXSurfaceMask) {
1593        case ISurfaceComposerClient::eFXSurfaceNormal:
1594            layer = createNormalLayer(client, w, h, flags, format);
1595            break;
1596        case ISurfaceComposerClient::eFXSurfaceBlur:
1597        case ISurfaceComposerClient::eFXSurfaceDim:
1598            layer = createDimLayer(client, w, h, flags);
1599            break;
1600        case ISurfaceComposerClient::eFXSurfaceScreenshot:
1601            layer = createScreenshotLayer(client, w, h, flags);
1602            break;
1603    }
1604
1605    if (layer != 0) {
1606        layer->initStates(w, h, flags);
1607        layer->setName(name);
1608        ssize_t token = addClientLayer(client, layer);
1609        surfaceHandle = layer->getSurface();
1610        if (surfaceHandle != 0) {
1611            params->token = token;
1612            params->identity = layer->getIdentity();
1613        }
1614        setTransactionFlags(eTransactionNeeded);
1615    }
1616
1617    return surfaceHandle;
1618}
1619
1620sp<Layer> SurfaceFlinger::createNormalLayer(
1621        const sp<Client>& client,
1622        uint32_t w, uint32_t h, uint32_t flags,
1623        PixelFormat& format)
1624{
1625    // initialize the surfaces
1626    switch (format) {
1627    case PIXEL_FORMAT_TRANSPARENT:
1628    case PIXEL_FORMAT_TRANSLUCENT:
1629        format = PIXEL_FORMAT_RGBA_8888;
1630        break;
1631    case PIXEL_FORMAT_OPAQUE:
1632#ifdef NO_RGBX_8888
1633        format = PIXEL_FORMAT_RGB_565;
1634#else
1635        format = PIXEL_FORMAT_RGBX_8888;
1636#endif
1637        break;
1638    }
1639
1640#ifdef NO_RGBX_8888
1641    if (format == PIXEL_FORMAT_RGBX_8888)
1642        format = PIXEL_FORMAT_RGBA_8888;
1643#endif
1644
1645    sp<Layer> layer = new Layer(this, client);
1646    status_t err = layer->setBuffers(w, h, format, flags);
1647    if (CC_LIKELY(err != NO_ERROR)) {
1648        ALOGE("createNormalLayer() failed (%s)", strerror(-err));
1649        layer.clear();
1650    }
1651    return layer;
1652}
1653
1654sp<LayerDim> SurfaceFlinger::createDimLayer(
1655        const sp<Client>& client,
1656        uint32_t w, uint32_t h, uint32_t flags)
1657{
1658    sp<LayerDim> layer = new LayerDim(this, client);
1659    return layer;
1660}
1661
1662sp<LayerScreenshot> SurfaceFlinger::createScreenshotLayer(
1663        const sp<Client>& client,
1664        uint32_t w, uint32_t h, uint32_t flags)
1665{
1666    sp<LayerScreenshot> layer = new LayerScreenshot(this, client);
1667    return layer;
1668}
1669
1670status_t SurfaceFlinger::onLayerRemoved(const sp<Client>& client, SurfaceID sid)
1671{
1672    /*
1673     * called by the window manager, when a surface should be marked for
1674     * destruction.
1675     *
1676     * The surface is removed from the current and drawing lists, but placed
1677     * in the purgatory queue, so it's not destroyed right-away (we need
1678     * to wait for all client's references to go away first).
1679     */
1680
1681    status_t err = NAME_NOT_FOUND;
1682    Mutex::Autolock _l(mStateLock);
1683    sp<LayerBaseClient> layer = client->getLayerUser(sid);
1684
1685    if (layer != 0) {
1686        err = purgatorizeLayer_l(layer);
1687        if (err == NO_ERROR) {
1688            setTransactionFlags(eTransactionNeeded);
1689        }
1690    }
1691    return err;
1692}
1693
1694status_t SurfaceFlinger::onLayerDestroyed(const wp<LayerBaseClient>& layer)
1695{
1696    // called by ~ISurface() when all references are gone
1697    status_t err = NO_ERROR;
1698    sp<LayerBaseClient> l(layer.promote());
1699    if (l != NULL) {
1700        Mutex::Autolock _l(mStateLock);
1701        err = removeLayer_l(l);
1702        if (err == NAME_NOT_FOUND) {
1703            // The surface wasn't in the current list, which means it was
1704            // removed already, which means it is in the purgatory,
1705            // and need to be removed from there.
1706            ssize_t idx = mLayerPurgatory.remove(l);
1707            ALOGE_IF(idx < 0,
1708                    "layer=%p is not in the purgatory list", l.get());
1709        }
1710        ALOGE_IF(err<0 && err != NAME_NOT_FOUND,
1711                "error removing layer=%p (%s)", l.get(), strerror(-err));
1712    }
1713    return err;
1714}
1715
1716// ---------------------------------------------------------------------------
1717
1718void SurfaceFlinger::onInitializeDisplays() {
1719    // reset screen orientation
1720    Vector<ComposerState> state;
1721    Vector<DisplayState> displays;
1722    DisplayState d;
1723    d.what = DisplayState::eOrientationChanged;
1724    d.token = mDefaultDisplays[DisplayDevice::DISPLAY_PRIMARY];
1725    d.orientation = DisplayState::eOrientationDefault;
1726    displays.add(d);
1727    setTransactionState(state, displays, 0);
1728
1729    // XXX: this should init default device to "unblank" and all other devices to "blank"
1730    onScreenAcquired();
1731}
1732
1733void SurfaceFlinger::initializeDisplays() {
1734    class MessageScreenInitialized : public MessageBase {
1735        SurfaceFlinger* flinger;
1736    public:
1737        MessageScreenInitialized(SurfaceFlinger* flinger) : flinger(flinger) { }
1738        virtual bool handler() {
1739            flinger->onInitializeDisplays();
1740            return true;
1741        }
1742    };
1743    sp<MessageBase> msg = new MessageScreenInitialized(this);
1744    postMessageAsync(msg);  // we may be called from main thread, use async message
1745}
1746
1747
1748void SurfaceFlinger::onScreenAcquired() {
1749    ALOGD("Screen about to return, flinger = %p", this);
1750    sp<const DisplayDevice> hw(getDefaultDisplayDevice()); // XXX: this should be per DisplayDevice
1751    getHwComposer().acquire();
1752    hw->acquireScreen();
1753    mEventThread->onScreenAcquired();
1754    mVisibleRegionsDirty = true;
1755    repaintEverything();
1756}
1757
1758void SurfaceFlinger::onScreenReleased() {
1759    ALOGD("About to give-up screen, flinger = %p", this);
1760    sp<const DisplayDevice> hw(getDefaultDisplayDevice()); // XXX: this should be per DisplayDevice
1761    if (hw->isScreenAcquired()) {
1762        mEventThread->onScreenReleased();
1763        hw->releaseScreen();
1764        getHwComposer().release();
1765        // from this point on, SF will stop drawing
1766    }
1767}
1768
1769void SurfaceFlinger::unblank() {
1770    class MessageScreenAcquired : public MessageBase {
1771        SurfaceFlinger* flinger;
1772    public:
1773        MessageScreenAcquired(SurfaceFlinger* flinger) : flinger(flinger) { }
1774        virtual bool handler() {
1775            flinger->onScreenAcquired();
1776            return true;
1777        }
1778    };
1779    sp<MessageBase> msg = new MessageScreenAcquired(this);
1780    postMessageSync(msg);
1781}
1782
1783void SurfaceFlinger::blank() {
1784    class MessageScreenReleased : public MessageBase {
1785        SurfaceFlinger* flinger;
1786    public:
1787        MessageScreenReleased(SurfaceFlinger* flinger) : flinger(flinger) { }
1788        virtual bool handler() {
1789            flinger->onScreenReleased();
1790            return true;
1791        }
1792    };
1793    sp<MessageBase> msg = new MessageScreenReleased(this);
1794    postMessageSync(msg);
1795}
1796
1797// ---------------------------------------------------------------------------
1798
1799status_t SurfaceFlinger::dump(int fd, const Vector<String16>& args)
1800{
1801    const size_t SIZE = 4096;
1802    char buffer[SIZE];
1803    String8 result;
1804
1805    if (!PermissionCache::checkCallingPermission(sDump)) {
1806        snprintf(buffer, SIZE, "Permission Denial: "
1807                "can't dump SurfaceFlinger from pid=%d, uid=%d\n",
1808                IPCThreadState::self()->getCallingPid(),
1809                IPCThreadState::self()->getCallingUid());
1810        result.append(buffer);
1811    } else {
1812        // Try to get the main lock, but don't insist if we can't
1813        // (this would indicate SF is stuck, but we want to be able to
1814        // print something in dumpsys).
1815        int retry = 3;
1816        while (mStateLock.tryLock()<0 && --retry>=0) {
1817            usleep(1000000);
1818        }
1819        const bool locked(retry >= 0);
1820        if (!locked) {
1821            snprintf(buffer, SIZE,
1822                    "SurfaceFlinger appears to be unresponsive, "
1823                    "dumping anyways (no locks held)\n");
1824            result.append(buffer);
1825        }
1826
1827        bool dumpAll = true;
1828        size_t index = 0;
1829        size_t numArgs = args.size();
1830        if (numArgs) {
1831            if ((index < numArgs) &&
1832                    (args[index] == String16("--list"))) {
1833                index++;
1834                listLayersLocked(args, index, result, buffer, SIZE);
1835                dumpAll = false;
1836            }
1837
1838            if ((index < numArgs) &&
1839                    (args[index] == String16("--latency"))) {
1840                index++;
1841                dumpStatsLocked(args, index, result, buffer, SIZE);
1842                dumpAll = false;
1843            }
1844
1845            if ((index < numArgs) &&
1846                    (args[index] == String16("--latency-clear"))) {
1847                index++;
1848                clearStatsLocked(args, index, result, buffer, SIZE);
1849                dumpAll = false;
1850            }
1851        }
1852
1853        if (dumpAll) {
1854            dumpAllLocked(result, buffer, SIZE);
1855        }
1856
1857        if (locked) {
1858            mStateLock.unlock();
1859        }
1860    }
1861    write(fd, result.string(), result.size());
1862    return NO_ERROR;
1863}
1864
1865void SurfaceFlinger::listLayersLocked(const Vector<String16>& args, size_t& index,
1866        String8& result, char* buffer, size_t SIZE) const
1867{
1868    const LayerVector& currentLayers = mCurrentState.layersSortedByZ;
1869    const size_t count = currentLayers.size();
1870    for (size_t i=0 ; i<count ; i++) {
1871        const sp<LayerBase>& layer(currentLayers[i]);
1872        snprintf(buffer, SIZE, "%s\n", layer->getName().string());
1873        result.append(buffer);
1874    }
1875}
1876
1877void SurfaceFlinger::dumpStatsLocked(const Vector<String16>& args, size_t& index,
1878        String8& result, char* buffer, size_t SIZE) const
1879{
1880    String8 name;
1881    if (index < args.size()) {
1882        name = String8(args[index]);
1883        index++;
1884    }
1885
1886    const LayerVector& currentLayers = mCurrentState.layersSortedByZ;
1887    const size_t count = currentLayers.size();
1888    for (size_t i=0 ; i<count ; i++) {
1889        const sp<LayerBase>& layer(currentLayers[i]);
1890        if (name.isEmpty()) {
1891            snprintf(buffer, SIZE, "%s\n", layer->getName().string());
1892            result.append(buffer);
1893        }
1894        if (name.isEmpty() || (name == layer->getName())) {
1895            layer->dumpStats(result, buffer, SIZE);
1896        }
1897    }
1898}
1899
1900void SurfaceFlinger::clearStatsLocked(const Vector<String16>& args, size_t& index,
1901        String8& result, char* buffer, size_t SIZE) const
1902{
1903    String8 name;
1904    if (index < args.size()) {
1905        name = String8(args[index]);
1906        index++;
1907    }
1908
1909    const LayerVector& currentLayers = mCurrentState.layersSortedByZ;
1910    const size_t count = currentLayers.size();
1911    for (size_t i=0 ; i<count ; i++) {
1912        const sp<LayerBase>& layer(currentLayers[i]);
1913        if (name.isEmpty() || (name == layer->getName())) {
1914            layer->clearStats();
1915        }
1916    }
1917}
1918
1919void SurfaceFlinger::dumpAllLocked(
1920        String8& result, char* buffer, size_t SIZE) const
1921{
1922    // figure out if we're stuck somewhere
1923    const nsecs_t now = systemTime();
1924    const nsecs_t inSwapBuffers(mDebugInSwapBuffers);
1925    const nsecs_t inTransaction(mDebugInTransaction);
1926    nsecs_t inSwapBuffersDuration = (inSwapBuffers) ? now-inSwapBuffers : 0;
1927    nsecs_t inTransactionDuration = (inTransaction) ? now-inTransaction : 0;
1928
1929    /*
1930     * Dump the visible layer list
1931     */
1932    const LayerVector& currentLayers = mCurrentState.layersSortedByZ;
1933    const size_t count = currentLayers.size();
1934    snprintf(buffer, SIZE, "Visible layers (count = %d)\n", count);
1935    result.append(buffer);
1936    for (size_t i=0 ; i<count ; i++) {
1937        const sp<LayerBase>& layer(currentLayers[i]);
1938        layer->dump(result, buffer, SIZE);
1939    }
1940
1941    /*
1942     * Dump the layers in the purgatory
1943     */
1944
1945    const size_t purgatorySize = mLayerPurgatory.size();
1946    snprintf(buffer, SIZE, "Purgatory state (%d entries)\n", purgatorySize);
1947    result.append(buffer);
1948    for (size_t i=0 ; i<purgatorySize ; i++) {
1949        const sp<LayerBase>& layer(mLayerPurgatory.itemAt(i));
1950        layer->shortDump(result, buffer, SIZE);
1951    }
1952
1953    /*
1954     * Dump Display state
1955     */
1956
1957    for (size_t dpy=0 ; dpy<mDisplays.size() ; dpy++) {
1958        const sp<const DisplayDevice>& hw(mDisplays[dpy]);
1959        snprintf(buffer, SIZE,
1960                "+ DisplayDevice[%u]\n"
1961                "   id=%x, layerStack=%u, (%4dx%4d), orient=%2d, tr=%08x, "
1962                "flips=%u, secure=%d, numLayers=%u\n",
1963                dpy,
1964                hw->getDisplayType(), hw->getLayerStack(),
1965                hw->getWidth(), hw->getHeight(),
1966                hw->getOrientation(), hw->getTransform().getType(),
1967                hw->getPageFlipCount(),
1968                hw->getSecureLayerVisible(),
1969                hw->getVisibleLayersSortedByZ().size());
1970        result.append(buffer);
1971    }
1972
1973    /*
1974     * Dump SurfaceFlinger global state
1975     */
1976
1977    snprintf(buffer, SIZE, "SurfaceFlinger global state:\n");
1978    result.append(buffer);
1979
1980    HWComposer& hwc(getHwComposer());
1981    sp<const DisplayDevice> hw(getDefaultDisplayDevice());
1982    const GLExtensions& extensions(GLExtensions::getInstance());
1983    snprintf(buffer, SIZE, "GLES: %s, %s, %s\n",
1984            extensions.getVendor(),
1985            extensions.getRenderer(),
1986            extensions.getVersion());
1987    result.append(buffer);
1988
1989    snprintf(buffer, SIZE, "EGL : %s\n",
1990            eglQueryString(mEGLDisplay, EGL_VERSION_HW_ANDROID));
1991    result.append(buffer);
1992
1993    snprintf(buffer, SIZE, "EXTS: %s\n", extensions.getExtension());
1994    result.append(buffer);
1995
1996    hw->undefinedRegion.dump(result, "undefinedRegion");
1997    snprintf(buffer, SIZE,
1998            "  orientation=%d, canDraw=%d\n",
1999            hw->getOrientation(), hw->canDraw());
2000    result.append(buffer);
2001    snprintf(buffer, SIZE,
2002            "  last eglSwapBuffers() time: %f us\n"
2003            "  last transaction time     : %f us\n"
2004            "  transaction-flags         : %08x\n"
2005            "  refresh-rate              : %f fps\n"
2006            "  x-dpi                     : %f\n"
2007            "  y-dpi                     : %f\n",
2008            mLastSwapBufferTime/1000.0,
2009            mLastTransactionTime/1000.0,
2010            mTransactionFlags,
2011            1e9 / hwc.getRefreshPeriod(),
2012            hwc.getDpiX(),
2013            hwc.getDpiY());
2014    result.append(buffer);
2015
2016    snprintf(buffer, SIZE, "  eglSwapBuffers time: %f us\n",
2017            inSwapBuffersDuration/1000.0);
2018    result.append(buffer);
2019
2020    snprintf(buffer, SIZE, "  transaction time: %f us\n",
2021            inTransactionDuration/1000.0);
2022    result.append(buffer);
2023
2024    /*
2025     * VSYNC state
2026     */
2027    mEventThread->dump(result, buffer, SIZE);
2028
2029    /*
2030     * Dump HWComposer state
2031     */
2032    snprintf(buffer, SIZE, "h/w composer state:\n");
2033    result.append(buffer);
2034    snprintf(buffer, SIZE, "  h/w composer %s and %s\n",
2035            hwc.initCheck()==NO_ERROR ? "present" : "not present",
2036                    (mDebugDisableHWC || mDebugRegion) ? "disabled" : "enabled");
2037    result.append(buffer);
2038    hwc.dump(result, buffer, SIZE, hw->getVisibleLayersSortedByZ());
2039
2040    /*
2041     * Dump gralloc state
2042     */
2043    const GraphicBufferAllocator& alloc(GraphicBufferAllocator::get());
2044    alloc.dump(result);
2045    hw->dump(result);
2046}
2047
2048status_t SurfaceFlinger::onTransact(
2049    uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
2050{
2051    switch (code) {
2052        case CREATE_CONNECTION:
2053        case SET_TRANSACTION_STATE:
2054        case BOOT_FINISHED:
2055        case BLANK:
2056        case UNBLANK:
2057        {
2058            // codes that require permission check
2059            IPCThreadState* ipc = IPCThreadState::self();
2060            const int pid = ipc->getCallingPid();
2061            const int uid = ipc->getCallingUid();
2062            if ((uid != AID_GRAPHICS) &&
2063                    !PermissionCache::checkPermission(sAccessSurfaceFlinger, pid, uid)) {
2064                ALOGE("Permission Denial: "
2065                        "can't access SurfaceFlinger pid=%d, uid=%d", pid, uid);
2066                return PERMISSION_DENIED;
2067            }
2068            break;
2069        }
2070        case CAPTURE_SCREEN:
2071        {
2072            // codes that require permission check
2073            IPCThreadState* ipc = IPCThreadState::self();
2074            const int pid = ipc->getCallingPid();
2075            const int uid = ipc->getCallingUid();
2076            if ((uid != AID_GRAPHICS) &&
2077                    !PermissionCache::checkPermission(sReadFramebuffer, pid, uid)) {
2078                ALOGE("Permission Denial: "
2079                        "can't read framebuffer pid=%d, uid=%d", pid, uid);
2080                return PERMISSION_DENIED;
2081            }
2082            break;
2083        }
2084    }
2085
2086    status_t err = BnSurfaceComposer::onTransact(code, data, reply, flags);
2087    if (err == UNKNOWN_TRANSACTION || err == PERMISSION_DENIED) {
2088        CHECK_INTERFACE(ISurfaceComposer, data, reply);
2089        if (CC_UNLIKELY(!PermissionCache::checkCallingPermission(sHardwareTest))) {
2090            IPCThreadState* ipc = IPCThreadState::self();
2091            const int pid = ipc->getCallingPid();
2092            const int uid = ipc->getCallingUid();
2093            ALOGE("Permission Denial: "
2094                    "can't access SurfaceFlinger pid=%d, uid=%d", pid, uid);
2095            return PERMISSION_DENIED;
2096        }
2097        int n;
2098        switch (code) {
2099            case 1000: // SHOW_CPU, NOT SUPPORTED ANYMORE
2100            case 1001: // SHOW_FPS, NOT SUPPORTED ANYMORE
2101                return NO_ERROR;
2102            case 1002:  // SHOW_UPDATES
2103                n = data.readInt32();
2104                mDebugRegion = n ? n : (mDebugRegion ? 0 : 1);
2105                invalidateHwcGeometry();
2106                repaintEverything();
2107                return NO_ERROR;
2108            case 1004:{ // repaint everything
2109                repaintEverything();
2110                return NO_ERROR;
2111            }
2112            case 1005:{ // force transaction
2113                setTransactionFlags(
2114                        eTransactionNeeded|
2115                        eDisplayTransactionNeeded|
2116                        eTraversalNeeded);
2117                return NO_ERROR;
2118            }
2119            case 1006:{ // send empty update
2120                signalRefresh();
2121                return NO_ERROR;
2122            }
2123            case 1008:  // toggle use of hw composer
2124                n = data.readInt32();
2125                mDebugDisableHWC = n ? 1 : 0;
2126                invalidateHwcGeometry();
2127                repaintEverything();
2128                return NO_ERROR;
2129            case 1009:  // toggle use of transform hint
2130                n = data.readInt32();
2131                mDebugDisableTransformHint = n ? 1 : 0;
2132                invalidateHwcGeometry();
2133                repaintEverything();
2134                return NO_ERROR;
2135            case 1010:  // interrogate.
2136                reply->writeInt32(0);
2137                reply->writeInt32(0);
2138                reply->writeInt32(mDebugRegion);
2139                reply->writeInt32(0);
2140                reply->writeInt32(mDebugDisableHWC);
2141                return NO_ERROR;
2142            case 1013: {
2143                Mutex::Autolock _l(mStateLock);
2144                sp<const DisplayDevice> hw(getDefaultDisplayDevice());
2145                reply->writeInt32(hw->getPageFlipCount());
2146            }
2147            return NO_ERROR;
2148        }
2149    }
2150    return err;
2151}
2152
2153void SurfaceFlinger::repaintEverything() {
2154    android_atomic_or(1, &mRepaintEverything);
2155    signalTransaction();
2156}
2157
2158// ---------------------------------------------------------------------------
2159
2160status_t SurfaceFlinger::renderScreenToTexture(uint32_t layerStack,
2161        GLuint* textureName, GLfloat* uOut, GLfloat* vOut)
2162{
2163    Mutex::Autolock _l(mStateLock);
2164    return renderScreenToTextureLocked(layerStack, textureName, uOut, vOut);
2165}
2166
2167status_t SurfaceFlinger::renderScreenToTextureLocked(uint32_t layerStack,
2168        GLuint* textureName, GLfloat* uOut, GLfloat* vOut)
2169{
2170    ATRACE_CALL();
2171
2172    if (!GLExtensions::getInstance().haveFramebufferObject())
2173        return INVALID_OPERATION;
2174
2175    // get screen geometry
2176    // FIXME: figure out what it means to have a screenshot texture w/ multi-display
2177    sp<const DisplayDevice> hw(getDefaultDisplayDevice());
2178    const uint32_t hw_w = hw->getWidth();
2179    const uint32_t hw_h = hw->getHeight();
2180    GLfloat u = 1;
2181    GLfloat v = 1;
2182
2183    // make sure to clear all GL error flags
2184    while ( glGetError() != GL_NO_ERROR ) ;
2185
2186    // create a FBO
2187    GLuint name, tname;
2188    glGenTextures(1, &tname);
2189    glBindTexture(GL_TEXTURE_2D, tname);
2190    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
2191    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
2192    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB,
2193            hw_w, hw_h, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
2194    if (glGetError() != GL_NO_ERROR) {
2195        while ( glGetError() != GL_NO_ERROR ) ;
2196        GLint tw = (2 << (31 - clz(hw_w)));
2197        GLint th = (2 << (31 - clz(hw_h)));
2198        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB,
2199                tw, th, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
2200        u = GLfloat(hw_w) / tw;
2201        v = GLfloat(hw_h) / th;
2202    }
2203    glGenFramebuffersOES(1, &name);
2204    glBindFramebufferOES(GL_FRAMEBUFFER_OES, name);
2205    glFramebufferTexture2DOES(GL_FRAMEBUFFER_OES,
2206            GL_COLOR_ATTACHMENT0_OES, GL_TEXTURE_2D, tname, 0);
2207
2208    // redraw the screen entirely...
2209    glDisable(GL_TEXTURE_EXTERNAL_OES);
2210    glDisable(GL_TEXTURE_2D);
2211    glClearColor(0,0,0,1);
2212    glClear(GL_COLOR_BUFFER_BIT);
2213    glMatrixMode(GL_MODELVIEW);
2214    glLoadIdentity();
2215    const Vector< sp<LayerBase> >& layers(hw->getVisibleLayersSortedByZ());
2216    const size_t count = layers.size();
2217    for (size_t i=0 ; i<count ; ++i) {
2218        const sp<LayerBase>& layer(layers[i]);
2219        layer->draw(hw);
2220    }
2221
2222    hw->compositionComplete();
2223
2224    // back to main framebuffer
2225    glBindFramebufferOES(GL_FRAMEBUFFER_OES, 0);
2226    glDeleteFramebuffersOES(1, &name);
2227
2228    *textureName = tname;
2229    *uOut = u;
2230    *vOut = v;
2231    return NO_ERROR;
2232}
2233
2234// ---------------------------------------------------------------------------
2235
2236status_t SurfaceFlinger::captureScreenImplLocked(const sp<IBinder>& display,
2237        sp<IMemoryHeap>* heap,
2238        uint32_t* w, uint32_t* h, PixelFormat* f,
2239        uint32_t sw, uint32_t sh,
2240        uint32_t minLayerZ, uint32_t maxLayerZ)
2241{
2242    ATRACE_CALL();
2243
2244    status_t result = PERMISSION_DENIED;
2245
2246    if (!GLExtensions::getInstance().haveFramebufferObject()) {
2247        return INVALID_OPERATION;
2248    }
2249
2250    // get screen geometry
2251    sp<const DisplayDevice> hw(getDisplayDevice(display));
2252    const uint32_t hw_w = hw->getWidth();
2253    const uint32_t hw_h = hw->getHeight();
2254
2255    // if we have secure windows on this display, never allow the screen capture
2256    if (hw->getSecureLayerVisible()) {
2257        ALOGW("FB is protected: PERMISSION_DENIED");
2258        return PERMISSION_DENIED;
2259    }
2260
2261    if ((sw > hw_w) || (sh > hw_h)) {
2262        ALOGE("size mismatch (%d, %d) > (%d, %d)", sw, sh, hw_w, hw_h);
2263        return BAD_VALUE;
2264    }
2265
2266    sw = (!sw) ? hw_w : sw;
2267    sh = (!sh) ? hw_h : sh;
2268    const size_t size = sw * sh * 4;
2269    const bool filtering = sw != hw_w || sh != hw_h;
2270
2271//    ALOGD("screenshot: sw=%d, sh=%d, minZ=%d, maxZ=%d",
2272//            sw, sh, minLayerZ, maxLayerZ);
2273
2274    // make sure to clear all GL error flags
2275    while ( glGetError() != GL_NO_ERROR ) ;
2276
2277    // create a FBO
2278    GLuint name, tname;
2279    glGenRenderbuffersOES(1, &tname);
2280    glBindRenderbufferOES(GL_RENDERBUFFER_OES, tname);
2281    glRenderbufferStorageOES(GL_RENDERBUFFER_OES, GL_RGBA8_OES, sw, sh);
2282
2283    glGenFramebuffersOES(1, &name);
2284    glBindFramebufferOES(GL_FRAMEBUFFER_OES, name);
2285    glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES,
2286            GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, tname);
2287
2288    GLenum status = glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES);
2289
2290    if (status == GL_FRAMEBUFFER_COMPLETE_OES) {
2291
2292        // invert everything, b/c glReadPixel() below will invert the FB
2293        glViewport(0, 0, sw, sh);
2294        glMatrixMode(GL_PROJECTION);
2295        glPushMatrix();
2296        glLoadIdentity();
2297        glOrthof(0, hw_w, hw_h, 0, 0, 1);
2298        glMatrixMode(GL_MODELVIEW);
2299
2300        // redraw the screen entirely...
2301        glClearColor(0,0,0,1);
2302        glClear(GL_COLOR_BUFFER_BIT);
2303
2304        const Vector< sp<LayerBase> >& layers(hw->getVisibleLayersSortedByZ());
2305        const size_t count = layers.size();
2306        for (size_t i=0 ; i<count ; ++i) {
2307            const sp<LayerBase>& layer(layers[i]);
2308            const uint32_t z = layer->drawingState().z;
2309            if (z >= minLayerZ && z <= maxLayerZ) {
2310                if (filtering) layer->setFiltering(true);
2311                layer->draw(hw);
2312                if (filtering) layer->setFiltering(false);
2313            }
2314        }
2315
2316        // check for errors and return screen capture
2317        if (glGetError() != GL_NO_ERROR) {
2318            // error while rendering
2319            result = INVALID_OPERATION;
2320        } else {
2321            // allocate shared memory large enough to hold the
2322            // screen capture
2323            sp<MemoryHeapBase> base(
2324                    new MemoryHeapBase(size, 0, "screen-capture") );
2325            void* const ptr = base->getBase();
2326            if (ptr) {
2327                // capture the screen with glReadPixels()
2328                ScopedTrace _t(ATRACE_TAG, "glReadPixels");
2329                glReadPixels(0, 0, sw, sh, GL_RGBA, GL_UNSIGNED_BYTE, ptr);
2330                if (glGetError() == GL_NO_ERROR) {
2331                    *heap = base;
2332                    *w = sw;
2333                    *h = sh;
2334                    *f = PIXEL_FORMAT_RGBA_8888;
2335                    result = NO_ERROR;
2336                }
2337            } else {
2338                result = NO_MEMORY;
2339            }
2340        }
2341        glViewport(0, 0, hw_w, hw_h);
2342        glMatrixMode(GL_PROJECTION);
2343        glPopMatrix();
2344        glMatrixMode(GL_MODELVIEW);
2345    } else {
2346        result = BAD_VALUE;
2347    }
2348
2349    // release FBO resources
2350    glBindFramebufferOES(GL_FRAMEBUFFER_OES, 0);
2351    glDeleteRenderbuffersOES(1, &tname);
2352    glDeleteFramebuffersOES(1, &name);
2353
2354    hw->compositionComplete();
2355
2356//    ALOGD("screenshot: result = %s", result<0 ? strerror(result) : "OK");
2357
2358    return result;
2359}
2360
2361
2362status_t SurfaceFlinger::captureScreen(const sp<IBinder>& display,
2363        sp<IMemoryHeap>* heap,
2364        uint32_t* width, uint32_t* height, PixelFormat* format,
2365        uint32_t sw, uint32_t sh,
2366        uint32_t minLayerZ, uint32_t maxLayerZ)
2367{
2368    if (CC_UNLIKELY(display == 0))
2369        return BAD_VALUE;
2370
2371    if (!GLExtensions::getInstance().haveFramebufferObject())
2372        return INVALID_OPERATION;
2373
2374    class MessageCaptureScreen : public MessageBase {
2375        SurfaceFlinger* flinger;
2376        sp<IBinder> display;
2377        sp<IMemoryHeap>* heap;
2378        uint32_t* w;
2379        uint32_t* h;
2380        PixelFormat* f;
2381        uint32_t sw;
2382        uint32_t sh;
2383        uint32_t minLayerZ;
2384        uint32_t maxLayerZ;
2385        status_t result;
2386    public:
2387        MessageCaptureScreen(SurfaceFlinger* flinger, const sp<IBinder>& display,
2388                sp<IMemoryHeap>* heap, uint32_t* w, uint32_t* h, PixelFormat* f,
2389                uint32_t sw, uint32_t sh,
2390                uint32_t minLayerZ, uint32_t maxLayerZ)
2391            : flinger(flinger), display(display),
2392              heap(heap), w(w), h(h), f(f), sw(sw), sh(sh),
2393              minLayerZ(minLayerZ), maxLayerZ(maxLayerZ),
2394              result(PERMISSION_DENIED)
2395        {
2396        }
2397        status_t getResult() const {
2398            return result;
2399        }
2400        virtual bool handler() {
2401            Mutex::Autolock _l(flinger->mStateLock);
2402            result = flinger->captureScreenImplLocked(display,
2403                    heap, w, h, f, sw, sh, minLayerZ, maxLayerZ);
2404            return true;
2405        }
2406    };
2407
2408    sp<MessageBase> msg = new MessageCaptureScreen(this,
2409            display, heap, width, height, format, sw, sh, minLayerZ, maxLayerZ);
2410    status_t res = postMessageSync(msg);
2411    if (res == NO_ERROR) {
2412        res = static_cast<MessageCaptureScreen*>( msg.get() )->getResult();
2413    }
2414    return res;
2415}
2416
2417// ---------------------------------------------------------------------------
2418
2419SurfaceFlinger::LayerVector::LayerVector() {
2420}
2421
2422SurfaceFlinger::LayerVector::LayerVector(const LayerVector& rhs)
2423    : SortedVector<sp<LayerBase> >(rhs) {
2424}
2425
2426int SurfaceFlinger::LayerVector::do_compare(const void* lhs,
2427    const void* rhs) const
2428{
2429    // sort layers per layer-stack, then by z-order and finally by sequence
2430    const sp<LayerBase>& l(*reinterpret_cast<const sp<LayerBase>*>(lhs));
2431    const sp<LayerBase>& r(*reinterpret_cast<const sp<LayerBase>*>(rhs));
2432
2433    uint32_t ls = l->currentState().layerStack;
2434    uint32_t rs = r->currentState().layerStack;
2435    if (ls != rs)
2436        return ls - rs;
2437
2438    uint32_t lz = l->currentState().z;
2439    uint32_t rz = r->currentState().z;
2440    if (lz != rz)
2441        return lz - rz;
2442
2443    return l->sequence - r->sequence;
2444}
2445
2446// ---------------------------------------------------------------------------
2447
2448SurfaceFlinger::DisplayDeviceState::DisplayDeviceState()
2449    : type(DisplayDevice::DISPLAY_ID_INVALID) {
2450}
2451
2452SurfaceFlinger::DisplayDeviceState::DisplayDeviceState(DisplayDevice::DisplayType type)
2453    : type(type), layerStack(0), orientation(0) {
2454}
2455
2456// ---------------------------------------------------------------------------
2457
2458GraphicBufferAlloc::GraphicBufferAlloc() {}
2459
2460GraphicBufferAlloc::~GraphicBufferAlloc() {}
2461
2462sp<GraphicBuffer> GraphicBufferAlloc::createGraphicBuffer(uint32_t w, uint32_t h,
2463        PixelFormat format, uint32_t usage, status_t* error) {
2464    sp<GraphicBuffer> graphicBuffer(new GraphicBuffer(w, h, format, usage));
2465    status_t err = graphicBuffer->initCheck();
2466    *error = err;
2467    if (err != 0 || graphicBuffer->handle == 0) {
2468        if (err == NO_MEMORY) {
2469            GraphicBuffer::dumpAllocationsToSystemLog();
2470        }
2471        ALOGE("GraphicBufferAlloc::createGraphicBuffer(w=%d, h=%d) "
2472             "failed (%s), handle=%p",
2473                w, h, strerror(-err), graphicBuffer->handle);
2474        return 0;
2475    }
2476    return graphicBuffer;
2477}
2478
2479// ---------------------------------------------------------------------------
2480
2481}; // namespace android
2482