SurfaceFlinger.cpp revision 93997a8a75942b4d06cf50925de5bede489cc134 
1/*
2 * Copyright (C) 2007 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#define ATRACE_TAG ATRACE_TAG_GRAPHICS
18
19#include <stdint.h>
20#include <sys/types.h>
21#include <errno.h>
22#include <math.h>
23
24#include <EGL/egl.h>
25#include <GLES/gl.h>
26
27#include <cutils/log.h>
28#include <cutils/properties.h>
29
30#include <binder/IPCThreadState.h>
31#include <binder/IServiceManager.h>
32#include <binder/MemoryHeapBase.h>
33#include <binder/PermissionCache.h>
34
35#include <ui/DisplayInfo.h>
36
37#include <gui/BitTube.h>
38#include <gui/BufferQueue.h>
39#include <gui/IDisplayEventConnection.h>
40#include <gui/SurfaceTextureClient.h>
41
42#include <ui/GraphicBufferAllocator.h>
43#include <ui/PixelFormat.h>
44
45#include <utils/String8.h>
46#include <utils/String16.h>
47#include <utils/StopWatch.h>
48#include <utils/Trace.h>
49
50#include <private/android_filesystem_config.h>
51
52#include "clz.h"
53#include "DdmConnection.h"
54#include "DisplayDevice.h"
55#include "Client.h"
56#include "EventThread.h"
57#include "GLExtensions.h"
58#include "Layer.h"
59#include "LayerDim.h"
60#include "LayerScreenshot.h"
61#include "SurfaceFlinger.h"
62
63#include "DisplayHardware/FramebufferSurface.h"
64#include "DisplayHardware/HWComposer.h"
65
66
67#define EGL_VERSION_HW_ANDROID  0x3143
68
69#define DISPLAY_COUNT       1
70
71namespace android {
72// ---------------------------------------------------------------------------
73
74const String16 sHardwareTest("android.permission.HARDWARE_TEST");
75const String16 sAccessSurfaceFlinger("android.permission.ACCESS_SURFACE_FLINGER");
76const String16 sReadFramebuffer("android.permission.READ_FRAME_BUFFER");
77const String16 sDump("android.permission.DUMP");
78
79// ---------------------------------------------------------------------------
80
81SurfaceFlinger::SurfaceFlinger()
82    :   BnSurfaceComposer(), Thread(false),
83        mTransactionFlags(0),
84        mTransationPending(false),
85        mLayersRemoved(false),
86        mRepaintEverything(0),
87        mBootTime(systemTime()),
88        mVisibleRegionsDirty(false),
89        mHwWorkListDirty(false),
90        mDebugRegion(0),
91        mDebugDDMS(0),
92        mDebugDisableHWC(0),
93        mDebugDisableTransformHint(0),
94        mDebugInSwapBuffers(0),
95        mLastSwapBufferTime(0),
96        mDebugInTransaction(0),
97        mLastTransactionTime(0),
98        mBootFinished(false)
99{
100    ALOGI("SurfaceFlinger is starting");
101
102    // debugging stuff...
103    char value[PROPERTY_VALUE_MAX];
104
105    property_get("debug.sf.showupdates", value, "0");
106    mDebugRegion = atoi(value);
107
108    property_get("debug.sf.ddms", value, "0");
109    mDebugDDMS = atoi(value);
110    if (mDebugDDMS) {
111        DdmConnection::start(getServiceName());
112    }
113
114    ALOGI_IF(mDebugRegion, "showupdates enabled");
115    ALOGI_IF(mDebugDDMS, "DDMS debugging enabled");
116}
117
118void SurfaceFlinger::onFirstRef()
119{
120    mEventQueue.init(this);
121
122    run("SurfaceFlinger", PRIORITY_URGENT_DISPLAY);
123
124    // Wait for the main thread to be done with its initialization
125    mReadyToRunBarrier.wait();
126}
127
128
129SurfaceFlinger::~SurfaceFlinger()
130{
131    EGLDisplay display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
132    eglMakeCurrent(display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
133    eglTerminate(display);
134}
135
136void SurfaceFlinger::binderDied(const wp<IBinder>& who)
137{
138    // the window manager died on us. prepare its eulogy.
139
140    // restore initial conditions (default device unblank, etc)
141    initializeDisplays();
142
143    // restart the boot-animation
144    startBootAnim();
145}
146
147sp<ISurfaceComposerClient> SurfaceFlinger::createConnection()
148{
149    sp<ISurfaceComposerClient> bclient;
150    sp<Client> client(new Client(this));
151    status_t err = client->initCheck();
152    if (err == NO_ERROR) {
153        bclient = client;
154    }
155    return bclient;
156}
157
158sp<IBinder> SurfaceFlinger::createDisplay()
159{
160    class DisplayToken : public BBinder {
161        sp<SurfaceFlinger> flinger;
162        virtual ~DisplayToken() {
163             // no more references, this display must be terminated
164             Mutex::Autolock _l(flinger->mStateLock);
165             flinger->mCurrentState.displays.removeItem(this);
166             flinger->setTransactionFlags(eDisplayTransactionNeeded);
167         }
168     public:
169        DisplayToken(const sp<SurfaceFlinger>& flinger)
170            : flinger(flinger) {
171        }
172    };
173
174    sp<BBinder> token = new DisplayToken(this);
175
176    Mutex::Autolock _l(mStateLock);
177    DisplayDeviceState info(DisplayDevice::DISPLAY_VIRTUAL);
178    mCurrentState.displays.add(token, info);
179
180    return token;
181}
182
183sp<IBinder> SurfaceFlinger::getBuiltInDisplay(int32_t id) {
184    if (uint32_t(id) >= DisplayDevice::NUM_DISPLAY_TYPES) {
185        ALOGE("getDefaultDisplay: id=%d is not a valid default display id", id);
186        return NULL;
187    }
188    return mDefaultDisplays[id];
189}
190
191sp<IGraphicBufferAlloc> SurfaceFlinger::createGraphicBufferAlloc()
192{
193    sp<GraphicBufferAlloc> gba(new GraphicBufferAlloc());
194    return gba;
195}
196
197void SurfaceFlinger::bootFinished()
198{
199    const nsecs_t now = systemTime();
200    const nsecs_t duration = now - mBootTime;
201    ALOGI("Boot is finished (%ld ms)", long(ns2ms(duration)) );
202    mBootFinished = true;
203
204    // wait patiently for the window manager death
205    const String16 name("window");
206    sp<IBinder> window(defaultServiceManager()->getService(name));
207    if (window != 0) {
208        window->linkToDeath(static_cast<IBinder::DeathRecipient*>(this));
209    }
210
211    // stop boot animation
212    // formerly we would just kill the process, but we now ask it to exit so it
213    // can choose where to stop the animation.
214    property_set("service.bootanim.exit", "1");
215}
216
217void SurfaceFlinger::deleteTextureAsync(GLuint texture) {
218    class MessageDestroyGLTexture : public MessageBase {
219        GLuint texture;
220    public:
221        MessageDestroyGLTexture(GLuint texture)
222            : texture(texture) {
223        }
224        virtual bool handler() {
225            glDeleteTextures(1, &texture);
226            return true;
227        }
228    };
229    postMessageAsync(new MessageDestroyGLTexture(texture));
230}
231
232status_t SurfaceFlinger::selectConfigForPixelFormat(
233        EGLDisplay dpy,
234        EGLint const* attrs,
235        PixelFormat format,
236        EGLConfig* outConfig)
237{
238    EGLConfig config = NULL;
239    EGLint numConfigs = -1, n=0;
240    eglGetConfigs(dpy, NULL, 0, &numConfigs);
241    EGLConfig* const configs = new EGLConfig[numConfigs];
242    eglChooseConfig(dpy, attrs, configs, numConfigs, &n);
243    for (int i=0 ; i<n ; i++) {
244        EGLint nativeVisualId = 0;
245        eglGetConfigAttrib(dpy, configs[i], EGL_NATIVE_VISUAL_ID, &nativeVisualId);
246        if (nativeVisualId>0 && format == nativeVisualId) {
247            *outConfig = configs[i];
248            delete [] configs;
249            return NO_ERROR;
250        }
251    }
252    delete [] configs;
253    return NAME_NOT_FOUND;
254}
255
256EGLConfig SurfaceFlinger::selectEGLConfig(EGLDisplay display, EGLint nativeVisualId) {
257    // select our EGLConfig. It must support EGL_RECORDABLE_ANDROID if
258    // it is to be used with WIFI displays
259    EGLConfig config;
260    EGLint dummy;
261    status_t err;
262    EGLint attribs[] = {
263            EGL_SURFACE_TYPE,           EGL_WINDOW_BIT,
264            EGL_RECORDABLE_ANDROID,     EGL_TRUE,
265            EGL_NONE
266    };
267    err = selectConfigForPixelFormat(display, attribs, nativeVisualId, &config);
268    if (err) {
269        // maybe we failed because of EGL_RECORDABLE_ANDROID
270        ALOGW("couldn't find an EGLConfig with EGL_RECORDABLE_ANDROID");
271        attribs[2] = EGL_NONE;
272        err = selectConfigForPixelFormat(display, attribs, nativeVisualId, &config);
273    }
274    ALOGE_IF(err, "couldn't find an EGLConfig matching the screen format");
275    if (eglGetConfigAttrib(display, config, EGL_CONFIG_CAVEAT, &dummy) == EGL_TRUE) {
276        ALOGW_IF(dummy == EGL_SLOW_CONFIG, "EGL_SLOW_CONFIG selected!");
277    }
278    return config;
279}
280
281EGLContext SurfaceFlinger::createGLContext(EGLDisplay display, EGLConfig config) {
282    // Also create our EGLContext
283    EGLint contextAttributes[] = {
284#ifdef EGL_IMG_context_priority
285#ifdef HAS_CONTEXT_PRIORITY
286#warning "using EGL_IMG_context_priority"
287            EGL_CONTEXT_PRIORITY_LEVEL_IMG, EGL_CONTEXT_PRIORITY_HIGH_IMG,
288#endif
289#endif
290            EGL_NONE, EGL_NONE
291    };
292    EGLContext ctxt = eglCreateContext(display, config, NULL, contextAttributes);
293    ALOGE_IF(ctxt==EGL_NO_CONTEXT, "EGLContext creation failed");
294    return ctxt;
295}
296
297void SurfaceFlinger::initializeGL(EGLDisplay display, EGLSurface surface) {
298    EGLBoolean result = eglMakeCurrent(display, surface, surface, mEGLContext);
299    if (!result) {
300        ALOGE("Couldn't create a working GLES context. check logs. exiting...");
301        exit(0);
302    }
303
304    GLExtensions& extensions(GLExtensions::getInstance());
305    extensions.initWithGLStrings(
306            glGetString(GL_VENDOR),
307            glGetString(GL_RENDERER),
308            glGetString(GL_VERSION),
309            glGetString(GL_EXTENSIONS),
310            eglQueryString(display, EGL_VENDOR),
311            eglQueryString(display, EGL_VERSION),
312            eglQueryString(display, EGL_EXTENSIONS));
313
314    EGLint w, h;
315    eglQuerySurface(display, surface, EGL_WIDTH,  &w);
316    eglQuerySurface(display, surface, EGL_HEIGHT, &h);
317
318    glGetIntegerv(GL_MAX_TEXTURE_SIZE, &mMaxTextureSize);
319    glGetIntegerv(GL_MAX_VIEWPORT_DIMS, mMaxViewportDims);
320
321    glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
322    glPixelStorei(GL_PACK_ALIGNMENT, 4);
323    glEnableClientState(GL_VERTEX_ARRAY);
324    glShadeModel(GL_FLAT);
325    glDisable(GL_DITHER);
326    glDisable(GL_CULL_FACE);
327
328    struct pack565 {
329        inline uint16_t operator() (int r, int g, int b) const {
330            return (r<<11)|(g<<5)|b;
331        }
332    } pack565;
333
334    const uint16_t protTexData[] = { pack565(0x03, 0x03, 0x03) };
335    glGenTextures(1, &mProtectedTexName);
336    glBindTexture(GL_TEXTURE_2D, mProtectedTexName);
337    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
338    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
339    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
340    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
341    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 1, 1, 0,
342            GL_RGB, GL_UNSIGNED_SHORT_5_6_5, protTexData);
343
344    glViewport(0, 0, w, h);
345    glMatrixMode(GL_PROJECTION);
346    glLoadIdentity();
347    // put the origin in the left-bottom corner
348    glOrthof(0, w, 0, h, 0, 1); // l=0, r=w ; b=0, t=h
349
350    // print some debugging info
351    EGLint r,g,b,a;
352    eglGetConfigAttrib(display, mEGLConfig, EGL_RED_SIZE,   &r);
353    eglGetConfigAttrib(display, mEGLConfig, EGL_GREEN_SIZE, &g);
354    eglGetConfigAttrib(display, mEGLConfig, EGL_BLUE_SIZE,  &b);
355    eglGetConfigAttrib(display, mEGLConfig, EGL_ALPHA_SIZE, &a);
356    ALOGI("EGL informations:");
357    ALOGI("vendor    : %s", extensions.getEglVendor());
358    ALOGI("version   : %s", extensions.getEglVersion());
359    ALOGI("extensions: %s", extensions.getEglExtension());
360    ALOGI("Client API: %s", eglQueryString(display, EGL_CLIENT_APIS)?:"Not Supported");
361    ALOGI("EGLSurface: %d-%d-%d-%d, config=%p", r, g, b, a, mEGLConfig);
362    ALOGI("OpenGL ES informations:");
363    ALOGI("vendor    : %s", extensions.getVendor());
364    ALOGI("renderer  : %s", extensions.getRenderer());
365    ALOGI("version   : %s", extensions.getVersion());
366    ALOGI("extensions: %s", extensions.getExtension());
367    ALOGI("GL_MAX_TEXTURE_SIZE = %d", mMaxTextureSize);
368    ALOGI("GL_MAX_VIEWPORT_DIMS = %d x %d", mMaxViewportDims[0], mMaxViewportDims[1]);
369}
370
371status_t SurfaceFlinger::readyToRun()
372{
373    ALOGI(  "SurfaceFlinger's main thread ready to run. "
374            "Initializing graphics H/W...");
375
376    // initialize EGL
377    mEGLDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY);
378    eglInitialize(mEGLDisplay, NULL, NULL);
379
380    // Initialize the main display
381    // create native window to main display
382    sp<FramebufferSurface> fbs = FramebufferSurface::create();
383    if (fbs == NULL) {
384        ALOGE("Display subsystem failed to initialize. check logs. exiting...");
385        exit(0);
386    }
387
388    sp<SurfaceTextureClient> stc(new SurfaceTextureClient(
389            static_cast<sp<ISurfaceTexture> >(fbs->getBufferQueue())));
390
391    // initialize the config and context
392    int format;
393    ANativeWindow* const anw = stc.get();
394    anw->query(anw, NATIVE_WINDOW_FORMAT, &format);
395    mEGLConfig  = selectEGLConfig(mEGLDisplay, format);
396    mEGLContext = createGLContext(mEGLDisplay, mEGLConfig);
397
398    // initialize our main display hardware
399
400    for (size_t i=0 ; i<DisplayDevice::NUM_DISPLAY_TYPES ; i++) {
401        mDefaultDisplays[i] = new BBinder();
402        mCurrentState.displays.add(mDefaultDisplays[i],
403                DisplayDeviceState((DisplayDevice::DisplayType)i));
404    }
405    sp<DisplayDevice> hw = new DisplayDevice(this,
406            DisplayDevice::DISPLAY_PRIMARY,
407            mDefaultDisplays[DisplayDevice::DISPLAY_PRIMARY],
408            anw, fbs, mEGLConfig);
409    mDisplays.add(mDefaultDisplays[DisplayDevice::DISPLAY_PRIMARY], hw);
410
411    //  initialize OpenGL ES
412    EGLSurface surface = hw->getEGLSurface();
413    initializeGL(mEGLDisplay, surface);
414
415    // start the EventThread
416    mEventThread = new EventThread(this);
417    mEventQueue.setEventThread(mEventThread);
418
419    // initialize the H/W composer
420    mHwc = new HWComposer(this,
421            *static_cast<HWComposer::EventHandler *>(this),
422            fbs->getFbHal());
423
424    // initialize our drawing state
425    mDrawingState = mCurrentState;
426
427    // We're now ready to accept clients...
428    mReadyToRunBarrier.open();
429
430    // set initial conditions (e.g. unblank default device)
431    initializeDisplays();
432
433    // start boot animation
434    startBootAnim();
435
436    return NO_ERROR;
437}
438
439int32_t SurfaceFlinger::allocateHwcDisplayId(DisplayDevice::DisplayType type) {
440    return (uint32_t(type) < DisplayDevice::NUM_DISPLAY_TYPES) ?
441            type : mHwc->allocateDisplayId();
442}
443
444void SurfaceFlinger::startBootAnim() {
445    // start boot animation
446    property_set("service.bootanim.exit", "0");
447    property_set("ctl.start", "bootanim");
448}
449
450uint32_t SurfaceFlinger::getMaxTextureSize() const {
451    return mMaxTextureSize;
452}
453
454uint32_t SurfaceFlinger::getMaxViewportDims() const {
455    return mMaxViewportDims[0] < mMaxViewportDims[1] ?
456            mMaxViewportDims[0] : mMaxViewportDims[1];
457}
458
459// ----------------------------------------------------------------------------
460
461bool SurfaceFlinger::authenticateSurfaceTexture(
462        const sp<ISurfaceTexture>& surfaceTexture) const {
463    Mutex::Autolock _l(mStateLock);
464    sp<IBinder> surfaceTextureBinder(surfaceTexture->asBinder());
465
466    // Check the visible layer list for the ISurface
467    const LayerVector& currentLayers = mCurrentState.layersSortedByZ;
468    size_t count = currentLayers.size();
469    for (size_t i=0 ; i<count ; i++) {
470        const sp<LayerBase>& layer(currentLayers[i]);
471        sp<LayerBaseClient> lbc(layer->getLayerBaseClient());
472        if (lbc != NULL) {
473            wp<IBinder> lbcBinder = lbc->getSurfaceTextureBinder();
474            if (lbcBinder == surfaceTextureBinder) {
475                return true;
476            }
477        }
478    }
479
480    // Check the layers in the purgatory.  This check is here so that if a
481    // SurfaceTexture gets destroyed before all the clients are done using it,
482    // the error will not be reported as "surface XYZ is not authenticated", but
483    // will instead fail later on when the client tries to use the surface,
484    // which should be reported as "surface XYZ returned an -ENODEV".  The
485    // purgatorized layers are no less authentic than the visible ones, so this
486    // should not cause any harm.
487    size_t purgatorySize =  mLayerPurgatory.size();
488    for (size_t i=0 ; i<purgatorySize ; i++) {
489        const sp<LayerBase>& layer(mLayerPurgatory.itemAt(i));
490        sp<LayerBaseClient> lbc(layer->getLayerBaseClient());
491        if (lbc != NULL) {
492            wp<IBinder> lbcBinder = lbc->getSurfaceTextureBinder();
493            if (lbcBinder == surfaceTextureBinder) {
494                return true;
495            }
496        }
497    }
498
499    return false;
500}
501
502status_t SurfaceFlinger::getDisplayInfo(const sp<IBinder>& display, DisplayInfo* info) {
503    // TODO: this is mostly here only for compatibility
504    //       the display size is needed but the display metrics should come from elsewhere
505    if (display != mDefaultDisplays[ISurfaceComposer::eDisplayIdMain]) {
506        // TODO: additional displays not yet supported
507        return BAD_INDEX;
508    }
509
510    const HWComposer& hwc(getHwComposer());
511    float xdpi = hwc.getDpiX();
512    float ydpi = hwc.getDpiY();
513
514    // TODO: Not sure if display density should handled by SF any longer
515    class Density {
516        static int getDensityFromProperty(char const* propName) {
517            char property[PROPERTY_VALUE_MAX];
518            int density = 0;
519            if (property_get(propName, property, NULL) > 0) {
520                density = atoi(property);
521            }
522            return density;
523        }
524    public:
525        static int getEmuDensity() {
526            return getDensityFromProperty("qemu.sf.lcd_density"); }
527        static int getBuildDensity()  {
528            return getDensityFromProperty("ro.sf.lcd_density"); }
529    };
530    // The density of the device is provided by a build property
531    float density = Density::getBuildDensity() / 160.0f;
532    if (density == 0) {
533        // the build doesn't provide a density -- this is wrong!
534        // use xdpi instead
535        ALOGE("ro.sf.lcd_density must be defined as a build property");
536        density = xdpi / 160.0f;
537    }
538    if (Density::getEmuDensity()) {
539        // if "qemu.sf.lcd_density" is specified, it overrides everything
540        xdpi = ydpi = density = Density::getEmuDensity();
541        density /= 160.0f;
542    }
543
544    sp<const DisplayDevice> hw(getDefaultDisplayDevice());
545    info->w = hw->getWidth();
546    info->h = hw->getHeight();
547    info->xdpi = xdpi;
548    info->ydpi = ydpi;
549    info->fps = float(1e9 / hwc.getRefreshPeriod());
550    info->density = density;
551    info->orientation = hw->getOrientation();
552    // TODO: this needs to go away (currently needed only by webkit)
553    getPixelFormatInfo(hw->getFormat(), &info->pixelFormatInfo);
554    return NO_ERROR;
555}
556
557// ----------------------------------------------------------------------------
558
559sp<IDisplayEventConnection> SurfaceFlinger::createDisplayEventConnection() {
560    return mEventThread->createEventConnection();
561}
562
563void SurfaceFlinger::connectDisplay(const sp<ISurfaceTexture>& surface) {
564
565    sp<IBinder> token;
566    { // scope for the lock
567        Mutex::Autolock _l(mStateLock);
568        token = mExtDisplayToken;
569    }
570
571    if (token == 0) {
572        token = createDisplay();
573    }
574
575    { // scope for the lock
576        Mutex::Autolock _l(mStateLock);
577        if (surface == 0) {
578            // release our current display. we're guarantee to have
579            // a reference to it (token), while we hold the lock
580            mExtDisplayToken = 0;
581        } else {
582            mExtDisplayToken = token;
583        }
584
585        DisplayDeviceState& info(mCurrentState.displays.editValueFor(token));
586        info.surface = surface;
587        setTransactionFlags(eDisplayTransactionNeeded);
588    }
589}
590
591// ----------------------------------------------------------------------------
592
593void SurfaceFlinger::waitForEvent() {
594    mEventQueue.waitMessage();
595}
596
597void SurfaceFlinger::signalTransaction() {
598    mEventQueue.invalidate();
599}
600
601void SurfaceFlinger::signalLayerUpdate() {
602    mEventQueue.invalidate();
603}
604
605void SurfaceFlinger::signalRefresh() {
606    mEventQueue.refresh();
607}
608
609status_t SurfaceFlinger::postMessageAsync(const sp<MessageBase>& msg,
610        nsecs_t reltime, uint32_t flags) {
611    return mEventQueue.postMessage(msg, reltime);
612}
613
614status_t SurfaceFlinger::postMessageSync(const sp<MessageBase>& msg,
615        nsecs_t reltime, uint32_t flags) {
616    status_t res = mEventQueue.postMessage(msg, reltime);
617    if (res == NO_ERROR) {
618        msg->wait();
619    }
620    return res;
621}
622
623bool SurfaceFlinger::threadLoop() {
624    waitForEvent();
625    return true;
626}
627
628void SurfaceFlinger::onVSyncReceived(int type, nsecs_t timestamp) {
629    if (uint32_t(type) < DisplayDevice::NUM_DISPLAY_TYPES) {
630        // we should only receive DisplayDevice::DisplayType from the vsync callback
631        const wp<IBinder>& token(mDefaultDisplays[type]);
632        mEventThread->onVSyncReceived(token, timestamp);
633    }
634}
635
636void SurfaceFlinger::eventControl(int event, int enabled) {
637    getHwComposer().eventControl(event, enabled);
638}
639
640void SurfaceFlinger::onMessageReceived(int32_t what) {
641    ATRACE_CALL();
642    switch (what) {
643    case MessageQueue::INVALIDATE:
644        handleMessageTransaction();
645        handleMessageInvalidate();
646        signalRefresh();
647        break;
648    case MessageQueue::REFRESH:
649        handleMessageRefresh();
650        break;
651    }
652}
653
654void SurfaceFlinger::handleMessageTransaction() {
655    uint32_t transactionFlags = peekTransactionFlags(eTransactionMask);
656    if (transactionFlags) {
657        handleTransaction(transactionFlags);
658    }
659}
660
661void SurfaceFlinger::handleMessageInvalidate() {
662    ATRACE_CALL();
663    handlePageFlip();
664}
665
666void SurfaceFlinger::handleMessageRefresh() {
667    ATRACE_CALL();
668    preComposition();
669    rebuildLayerStacks();
670    setUpHWComposer();
671    doDebugFlashRegions();
672    doComposition();
673    postComposition();
674}
675
676void SurfaceFlinger::doDebugFlashRegions()
677{
678    // is debugging enabled
679    if (CC_LIKELY(!mDebugRegion))
680        return;
681
682    const bool repaintEverything = mRepaintEverything;
683    for (size_t dpy=0 ; dpy<mDisplays.size() ; dpy++) {
684        const sp<DisplayDevice>& hw(mDisplays[dpy]);
685        if (hw->canDraw()) {
686            // transform the dirty region into this screen's coordinate space
687            const Region dirtyRegion(hw->getDirtyRegion(repaintEverything));
688            if (!dirtyRegion.isEmpty()) {
689                // redraw the whole screen
690                doComposeSurfaces(hw, Region(hw->bounds()));
691
692                // and draw the dirty region
693                glDisable(GL_TEXTURE_EXTERNAL_OES);
694                glDisable(GL_TEXTURE_2D);
695                glDisable(GL_BLEND);
696                glColor4f(1, 0, 1, 1);
697                const int32_t height = hw->getHeight();
698                Region::const_iterator it = dirtyRegion.begin();
699                Region::const_iterator const end = dirtyRegion.end();
700                while (it != end) {
701                    const Rect& r = *it++;
702                    GLfloat vertices[][2] = {
703                            { r.left,  height - r.top },
704                            { r.left,  height - r.bottom },
705                            { r.right, height - r.bottom },
706                            { r.right, height - r.top }
707                    };
708                    glVertexPointer(2, GL_FLOAT, 0, vertices);
709                    glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
710                }
711                hw->compositionComplete();
712                // FIXME
713                if (hw->getDisplayType() >= DisplayDevice::DISPLAY_VIRTUAL) {
714                    eglSwapBuffers(mEGLDisplay, hw->getEGLSurface());
715                }
716            }
717        }
718    }
719
720    postFramebuffer();
721
722    if (mDebugRegion > 1) {
723        usleep(mDebugRegion * 1000);
724    }
725}
726
727void SurfaceFlinger::preComposition()
728{
729    bool needExtraInvalidate = false;
730    const LayerVector& currentLayers(mDrawingState.layersSortedByZ);
731    const size_t count = currentLayers.size();
732    for (size_t i=0 ; i<count ; i++) {
733        if (currentLayers[i]->onPreComposition()) {
734            needExtraInvalidate = true;
735        }
736    }
737    if (needExtraInvalidate) {
738        signalLayerUpdate();
739    }
740}
741
742void SurfaceFlinger::postComposition()
743{
744    const LayerVector& currentLayers(mDrawingState.layersSortedByZ);
745    const size_t count = currentLayers.size();
746    for (size_t i=0 ; i<count ; i++) {
747        currentLayers[i]->onPostComposition();
748    }
749}
750
751void SurfaceFlinger::rebuildLayerStacks() {
752    // rebuild the visible layer list per screen
753    if (CC_UNLIKELY(mVisibleRegionsDirty)) {
754        ATRACE_CALL();
755        mVisibleRegionsDirty = false;
756        invalidateHwcGeometry();
757        const LayerVector& currentLayers(mDrawingState.layersSortedByZ);
758        for (size_t dpy=0 ; dpy<mDisplays.size() ; dpy++) {
759            const sp<DisplayDevice>& hw(mDisplays[dpy]);
760            const Transform& tr(hw->getTransform());
761            const Rect bounds(hw->getBounds());
762
763            Region opaqueRegion;
764            Region dirtyRegion;
765            computeVisibleRegions(currentLayers,
766                    hw->getLayerStack(), dirtyRegion, opaqueRegion);
767
768            Vector< sp<LayerBase> > layersSortedByZ;
769            const size_t count = currentLayers.size();
770            for (size_t i=0 ; i<count ; i++) {
771                const sp<LayerBase>& layer(currentLayers[i]);
772                const Layer::State& s(layer->drawingState());
773                if (s.layerStack == hw->getLayerStack()) {
774                    Region visibleRegion(tr.transform(layer->visibleRegion));
775                    visibleRegion.andSelf(bounds);
776                    if (!visibleRegion.isEmpty()) {
777                        layersSortedByZ.add(layer);
778                    }
779                }
780            }
781            hw->setVisibleLayersSortedByZ(layersSortedByZ);
782            hw->undefinedRegion.set(bounds);
783            hw->undefinedRegion.subtractSelf(tr.transform(opaqueRegion));
784            hw->dirtyRegion.orSelf(dirtyRegion);
785        }
786    }
787}
788
789void SurfaceFlinger::setUpHWComposer() {
790    HWComposer& hwc(getHwComposer());
791    if (hwc.initCheck() == NO_ERROR) {
792        // build the h/w work list
793        const bool workListsDirty = mHwWorkListDirty;
794        mHwWorkListDirty = false;
795        for (size_t dpy=0 ; dpy<mDisplays.size() ; dpy++) {
796            sp<const DisplayDevice> hw(mDisplays[dpy]);
797            const int32_t id = hw->getHwcDisplayId();
798            if (id >= 0) {
799                const Vector< sp<LayerBase> >& currentLayers(
800                    hw->getVisibleLayersSortedByZ());
801                const size_t count = currentLayers.size();
802                if (hwc.createWorkList(id, count) >= 0) {
803                    HWComposer::LayerListIterator cur = hwc.begin(id);
804                    const HWComposer::LayerListIterator end = hwc.end(id);
805                    for (size_t i=0 ; cur!=end && i<count ; ++i, ++cur) {
806                        const sp<LayerBase>& layer(currentLayers[i]);
807
808                        if (CC_UNLIKELY(workListsDirty)) {
809                            layer->setGeometry(hw, *cur);
810                            if (mDebugDisableHWC || mDebugRegion) {
811                                cur->setSkip(true);
812                            }
813                        }
814
815                        /*
816                         * update the per-frame h/w composer data for each layer
817                         * and build the transparent region of the FB
818                         */
819                        layer->setPerFrameData(hw, *cur);
820                    }
821                }
822            }
823        }
824        status_t err = hwc.prepare();
825        ALOGE_IF(err, "HWComposer::prepare failed (%s)", strerror(-err));
826    }
827}
828
829void SurfaceFlinger::doComposition() {
830    ATRACE_CALL();
831    const bool repaintEverything = android_atomic_and(0, &mRepaintEverything);
832    for (size_t dpy=0 ; dpy<mDisplays.size() ; dpy++) {
833        const sp<DisplayDevice>& hw(mDisplays[dpy]);
834        if (hw->canDraw()) {
835            // transform the dirty region into this screen's coordinate space
836            const Region dirtyRegion(hw->getDirtyRegion(repaintEverything));
837            if (!dirtyRegion.isEmpty()) {
838                // repaint the framebuffer (if needed)
839                doDisplayComposition(hw, dirtyRegion);
840            }
841            hw->dirtyRegion.clear();
842            hw->flip(hw->swapRegion);
843            hw->swapRegion.clear();
844        }
845        // inform the h/w that we're done compositing
846        hw->compositionComplete();
847    }
848    postFramebuffer();
849}
850
851void SurfaceFlinger::postFramebuffer()
852{
853    ATRACE_CALL();
854
855    const nsecs_t now = systemTime();
856    mDebugInSwapBuffers = now;
857
858    HWComposer& hwc(getHwComposer());
859    if (hwc.initCheck() == NO_ERROR) {
860        // FIXME: EGL spec says:
861        //   "surface must be bound to the calling thread's current context,
862        //    for the current rendering API."
863        DisplayDevice::makeCurrent(getDefaultDisplayDevice(), mEGLContext);
864        hwc.commit();
865    }
866
867    for (size_t dpy=0 ; dpy<mDisplays.size() ; dpy++) {
868        sp<const DisplayDevice> hw(mDisplays[dpy]);
869        const Vector< sp<LayerBase> >& currentLayers(hw->getVisibleLayersSortedByZ());
870        const size_t count = currentLayers.size();
871        int32_t id = hw->getHwcDisplayId();
872        if (id >=0 && hwc.initCheck() == NO_ERROR) {
873            HWComposer::LayerListIterator cur = hwc.begin(id);
874            const HWComposer::LayerListIterator end = hwc.end(id);
875            for (size_t i = 0; cur != end && i < count; ++i, ++cur) {
876                currentLayers[i]->onLayerDisplayed(hw, &*cur);
877            }
878        } else {
879            for (size_t i = 0; i < count; i++) {
880                currentLayers[i]->onLayerDisplayed(hw, NULL);
881            }
882        }
883    }
884
885    mLastSwapBufferTime = systemTime() - now;
886    mDebugInSwapBuffers = 0;
887}
888
889void SurfaceFlinger::handleTransaction(uint32_t transactionFlags)
890{
891    ATRACE_CALL();
892
893    Mutex::Autolock _l(mStateLock);
894    const nsecs_t now = systemTime();
895    mDebugInTransaction = now;
896
897    // Here we're guaranteed that some transaction flags are set
898    // so we can call handleTransactionLocked() unconditionally.
899    // We call getTransactionFlags(), which will also clear the flags,
900    // with mStateLock held to guarantee that mCurrentState won't change
901    // until the transaction is committed.
902
903    transactionFlags = getTransactionFlags(eTransactionMask);
904    handleTransactionLocked(transactionFlags);
905
906    mLastTransactionTime = systemTime() - now;
907    mDebugInTransaction = 0;
908    invalidateHwcGeometry();
909    // here the transaction has been committed
910}
911
912void SurfaceFlinger::handleTransactionLocked(uint32_t transactionFlags)
913{
914    const LayerVector& currentLayers(mCurrentState.layersSortedByZ);
915    const size_t count = currentLayers.size();
916
917    /*
918     * Traversal of the children
919     * (perform the transaction for each of them if needed)
920     */
921
922    if (transactionFlags & eTraversalNeeded) {
923        for (size_t i=0 ; i<count ; i++) {
924            const sp<LayerBase>& layer = currentLayers[i];
925            uint32_t trFlags = layer->getTransactionFlags(eTransactionNeeded);
926            if (!trFlags) continue;
927
928            const uint32_t flags = layer->doTransaction(0);
929            if (flags & Layer::eVisibleRegion)
930                mVisibleRegionsDirty = true;
931        }
932    }
933
934    /*
935     * Perform display own transactions if needed
936     */
937
938    if (transactionFlags & eDisplayTransactionNeeded) {
939        // here we take advantage of Vector's copy-on-write semantics to
940        // improve performance by skipping the transaction entirely when
941        // know that the lists are identical
942        const KeyedVector<  wp<IBinder>, DisplayDeviceState>& curr(mCurrentState.displays);
943        const KeyedVector<  wp<IBinder>, DisplayDeviceState>& draw(mDrawingState.displays);
944        if (!curr.isIdenticalTo(draw)) {
945            mVisibleRegionsDirty = true;
946            const size_t cc = curr.size();
947                  size_t dc = draw.size();
948
949            // find the displays that were removed
950            // (ie: in drawing state but not in current state)
951            // also handle displays that changed
952            // (ie: displays that are in both lists)
953            for (size_t i=0 ; i<dc ; i++) {
954                const ssize_t j = curr.indexOfKey(draw.keyAt(i));
955                if (j < 0) {
956                    // in drawing state but not in current state
957                    if (!draw[i].isMainDisplay()) {
958                        mDisplays.removeItem(draw.keyAt(i));
959                    } else {
960                        ALOGW("trying to remove the main display");
961                    }
962                } else {
963                    // this display is in both lists. see if something changed.
964                    const DisplayDeviceState& state(curr[j]);
965                    const wp<IBinder>& display(curr.keyAt(j));
966                    if (state.surface->asBinder() != draw[i].surface->asBinder()) {
967                        // changing the surface is like destroying and
968                        // recreating the DisplayDevice, so we just remove it
969                        // from the drawing state, so that it get re-added
970                        // below.
971                        mDisplays.removeItem(display);
972                        mDrawingState.displays.removeItemsAt(i);
973                        dc--; i--;
974                        // at this point we must loop to the next item
975                        continue;
976                    }
977
978                    const sp<DisplayDevice>& disp(getDisplayDevice(display));
979                    if (disp != NULL) {
980                        if (state.layerStack != draw[i].layerStack) {
981                            disp->setLayerStack(state.layerStack);
982                        }
983                        if (state.orientation != draw[i].orientation ||
984                                state.viewport != draw[i].viewport ||
985                                state.frame != draw[i].frame) {
986                            disp->setOrientation(state.orientation);
987                            // TODO: take viewport and frame into account
988                        }
989                    }
990                }
991            }
992
993            // find displays that were added
994            // (ie: in current state but not in drawing state)
995            for (size_t i=0 ; i<cc ; i++) {
996                if (draw.indexOfKey(curr.keyAt(i)) < 0) {
997                    const DisplayDeviceState& state(curr[i]);
998                    if (state.surface != NULL) {
999                        sp<SurfaceTextureClient> stc(
1000                                new SurfaceTextureClient(state.surface));
1001                        const wp<IBinder>& display(curr.keyAt(i));
1002                        sp<DisplayDevice> disp = new DisplayDevice(this,
1003                                state.type, display, stc, 0, mEGLConfig);
1004                        disp->setLayerStack(state.layerStack);
1005                        disp->setOrientation(state.orientation);
1006                        // TODO: take viewport and frame into account
1007                        mDisplays.add(display, disp);
1008                    }
1009                }
1010            }
1011        }
1012    }
1013
1014    /*
1015     * Perform our own transaction if needed
1016     */
1017
1018    const LayerVector& previousLayers(mDrawingState.layersSortedByZ);
1019    if (currentLayers.size() > previousLayers.size()) {
1020        // layers have been added
1021        mVisibleRegionsDirty = true;
1022    }
1023
1024    // some layers might have been removed, so
1025    // we need to update the regions they're exposing.
1026    if (mLayersRemoved) {
1027        mLayersRemoved = false;
1028        mVisibleRegionsDirty = true;
1029        const size_t count = previousLayers.size();
1030        for (size_t i=0 ; i<count ; i++) {
1031            const sp<LayerBase>& layer(previousLayers[i]);
1032            if (currentLayers.indexOf(layer) < 0) {
1033                // this layer is not visible anymore
1034                // TODO: we could traverse the tree from front to back and
1035                //       compute the actual visible region
1036                // TODO: we could cache the transformed region
1037                Layer::State front(layer->drawingState());
1038                Region visibleReg = front.transform.transform(
1039                        Region(Rect(front.active.w, front.active.h)));
1040                invalidateLayerStack(front.layerStack, visibleReg);
1041            }
1042        }
1043    }
1044
1045    commitTransaction();
1046}
1047
1048void SurfaceFlinger::commitTransaction()
1049{
1050    if (!mLayersPendingRemoval.isEmpty()) {
1051        // Notify removed layers now that they can't be drawn from
1052        for (size_t i = 0; i < mLayersPendingRemoval.size(); i++) {
1053            mLayersPendingRemoval[i]->onRemoved();
1054        }
1055        mLayersPendingRemoval.clear();
1056    }
1057
1058    mDrawingState = mCurrentState;
1059    mTransationPending = false;
1060    mTransactionCV.broadcast();
1061}
1062
1063void SurfaceFlinger::computeVisibleRegions(
1064        const LayerVector& currentLayers, uint32_t layerStack,
1065        Region& outDirtyRegion, Region& outOpaqueRegion)
1066{
1067    ATRACE_CALL();
1068
1069    Region aboveOpaqueLayers;
1070    Region aboveCoveredLayers;
1071    Region dirty;
1072
1073    outDirtyRegion.clear();
1074
1075    size_t i = currentLayers.size();
1076    while (i--) {
1077        const sp<LayerBase>& layer = currentLayers[i];
1078
1079        // start with the whole surface at its current location
1080        const Layer::State& s(layer->drawingState());
1081
1082        // only consider the layers on the given later stack
1083        if (s.layerStack != layerStack)
1084            continue;
1085
1086        /*
1087         * opaqueRegion: area of a surface that is fully opaque.
1088         */
1089        Region opaqueRegion;
1090
1091        /*
1092         * visibleRegion: area of a surface that is visible on screen
1093         * and not fully transparent. This is essentially the layer's
1094         * footprint minus the opaque regions above it.
1095         * Areas covered by a translucent surface are considered visible.
1096         */
1097        Region visibleRegion;
1098
1099        /*
1100         * coveredRegion: area of a surface that is covered by all
1101         * visible regions above it (which includes the translucent areas).
1102         */
1103        Region coveredRegion;
1104
1105
1106        // handle hidden surfaces by setting the visible region to empty
1107        if (CC_LIKELY(!(s.flags & layer_state_t::eLayerHidden) && s.alpha)) {
1108            const bool translucent = !layer->isOpaque();
1109            Rect bounds(layer->computeBounds());
1110            visibleRegion.set(bounds);
1111            if (!visibleRegion.isEmpty()) {
1112                // Remove the transparent area from the visible region
1113                if (translucent) {
1114                    Region transparentRegionScreen;
1115                    const Transform tr(s.transform);
1116                    if (tr.transformed()) {
1117                        if (tr.preserveRects()) {
1118                            // transform the transparent region
1119                            transparentRegionScreen = tr.transform(s.transparentRegion);
1120                        } else {
1121                            // transformation too complex, can't do the
1122                            // transparent region optimization.
1123                            transparentRegionScreen.clear();
1124                        }
1125                    } else {
1126                        transparentRegionScreen = s.transparentRegion;
1127                    }
1128                    visibleRegion.subtractSelf(transparentRegionScreen);
1129                }
1130
1131                // compute the opaque region
1132                const int32_t layerOrientation = s.transform.getOrientation();
1133                if (s.alpha==255 && !translucent &&
1134                        ((layerOrientation & Transform::ROT_INVALID) == false)) {
1135                    // the opaque region is the layer's footprint
1136                    opaqueRegion = visibleRegion;
1137                }
1138            }
1139        }
1140
1141        // Clip the covered region to the visible region
1142        coveredRegion = aboveCoveredLayers.intersect(visibleRegion);
1143
1144        // Update aboveCoveredLayers for next (lower) layer
1145        aboveCoveredLayers.orSelf(visibleRegion);
1146
1147        // subtract the opaque region covered by the layers above us
1148        visibleRegion.subtractSelf(aboveOpaqueLayers);
1149
1150        // compute this layer's dirty region
1151        if (layer->contentDirty) {
1152            // we need to invalidate the whole region
1153            dirty = visibleRegion;
1154            // as well, as the old visible region
1155            dirty.orSelf(layer->visibleRegion);
1156            layer->contentDirty = false;
1157        } else {
1158            /* compute the exposed region:
1159             *   the exposed region consists of two components:
1160             *   1) what's VISIBLE now and was COVERED before
1161             *   2) what's EXPOSED now less what was EXPOSED before
1162             *
1163             * note that (1) is conservative, we start with the whole
1164             * visible region but only keep what used to be covered by
1165             * something -- which mean it may have been exposed.
1166             *
1167             * (2) handles areas that were not covered by anything but got
1168             * exposed because of a resize.
1169             */
1170            const Region newExposed = visibleRegion - coveredRegion;
1171            const Region oldVisibleRegion = layer->visibleRegion;
1172            const Region oldCoveredRegion = layer->coveredRegion;
1173            const Region oldExposed = oldVisibleRegion - oldCoveredRegion;
1174            dirty = (visibleRegion&oldCoveredRegion) | (newExposed-oldExposed);
1175        }
1176        dirty.subtractSelf(aboveOpaqueLayers);
1177
1178        // accumulate to the screen dirty region
1179        outDirtyRegion.orSelf(dirty);
1180
1181        // Update aboveOpaqueLayers for next (lower) layer
1182        aboveOpaqueLayers.orSelf(opaqueRegion);
1183
1184        // Store the visible region is screen space
1185        layer->setVisibleRegion(visibleRegion);
1186        layer->setCoveredRegion(coveredRegion);
1187    }
1188
1189    outOpaqueRegion = aboveOpaqueLayers;
1190}
1191
1192void SurfaceFlinger::invalidateLayerStack(uint32_t layerStack,
1193        const Region& dirty) {
1194    for (size_t dpy=0 ; dpy<mDisplays.size() ; dpy++) {
1195        const sp<DisplayDevice>& hw(mDisplays[dpy]);
1196        if (hw->getLayerStack() == layerStack) {
1197            hw->dirtyRegion.orSelf(dirty);
1198        }
1199    }
1200}
1201
1202void SurfaceFlinger::handlePageFlip()
1203{
1204    Region dirtyRegion;
1205
1206    bool visibleRegions = false;
1207    const LayerVector& currentLayers(mDrawingState.layersSortedByZ);
1208    const size_t count = currentLayers.size();
1209    for (size_t i=0 ; i<count ; i++) {
1210        const sp<LayerBase>& layer(currentLayers[i]);
1211        const Region dirty(layer->latchBuffer(visibleRegions));
1212        Layer::State s(layer->drawingState());
1213        invalidateLayerStack(s.layerStack, dirty);
1214    }
1215
1216    mVisibleRegionsDirty |= visibleRegions;
1217}
1218
1219void SurfaceFlinger::invalidateHwcGeometry()
1220{
1221    mHwWorkListDirty = true;
1222}
1223
1224
1225void SurfaceFlinger::doDisplayComposition(const sp<const DisplayDevice>& hw,
1226        const Region& inDirtyRegion)
1227{
1228    Region dirtyRegion(inDirtyRegion);
1229
1230    // compute the invalid region
1231    hw->swapRegion.orSelf(dirtyRegion);
1232
1233    uint32_t flags = hw->getFlags();
1234    if (flags & DisplayDevice::SWAP_RECTANGLE) {
1235        // we can redraw only what's dirty, but since SWAP_RECTANGLE only
1236        // takes a rectangle, we must make sure to update that whole
1237        // rectangle in that case
1238        dirtyRegion.set(hw->swapRegion.bounds());
1239    } else {
1240        if (flags & DisplayDevice::PARTIAL_UPDATES) {
1241            // We need to redraw the rectangle that will be updated
1242            // (pushed to the framebuffer).
1243            // This is needed because PARTIAL_UPDATES only takes one
1244            // rectangle instead of a region (see DisplayDevice::flip())
1245            dirtyRegion.set(hw->swapRegion.bounds());
1246        } else {
1247            // we need to redraw everything (the whole screen)
1248            dirtyRegion.set(hw->bounds());
1249            hw->swapRegion = dirtyRegion;
1250        }
1251    }
1252
1253    doComposeSurfaces(hw, dirtyRegion);
1254
1255    // FIXME: we need to call eglSwapBuffers() on displays that have
1256    // GL composition and only on those.
1257    // however, currently hwc.commit() already does that for the main
1258    // display and never for the other ones
1259    if (hw->getDisplayType() >= DisplayDevice::DISPLAY_VIRTUAL) {
1260        // FIXME: EGL spec says:
1261        //   "surface must be bound to the calling thread's current context,
1262        //    for the current rendering API."
1263        eglSwapBuffers(mEGLDisplay, hw->getEGLSurface());
1264    }
1265
1266    // update the swap region and clear the dirty region
1267    hw->swapRegion.orSelf(dirtyRegion);
1268}
1269
1270void SurfaceFlinger::doComposeSurfaces(const sp<const DisplayDevice>& hw, const Region& dirty)
1271{
1272    const int32_t id = hw->getHwcDisplayId();
1273    HWComposer& hwc(getHwComposer());
1274    HWComposer::LayerListIterator cur = hwc.begin(id);
1275    const HWComposer::LayerListIterator end = hwc.end(id);
1276
1277    const bool hasGlesComposition = hwc.hasGlesComposition(id) || (cur==end);
1278    if (hasGlesComposition) {
1279        DisplayDevice::makeCurrent(hw, mEGLContext);
1280
1281        // set the frame buffer
1282        glMatrixMode(GL_MODELVIEW);
1283        glLoadIdentity();
1284
1285        // Never touch the framebuffer if we don't have any framebuffer layers
1286        const bool hasHwcComposition = hwc.hasHwcComposition(id);
1287        if (hasHwcComposition) {
1288            // when using overlays, we assume a fully transparent framebuffer
1289            // NOTE: we could reduce how much we need to clear, for instance
1290            // remove where there are opaque FB layers. however, on some
1291            // GPUs doing a "clean slate" glClear might be more efficient.
1292            // We'll revisit later if needed.
1293            glClearColor(0, 0, 0, 0);
1294            glClear(GL_COLOR_BUFFER_BIT);
1295        } else {
1296            const Region region(hw->undefinedRegion.intersect(dirty));
1297            // screen is already cleared here
1298            if (!region.isEmpty()) {
1299                // can happen with SurfaceView
1300                drawWormhole(hw, region);
1301            }
1302        }
1303    }
1304
1305    /*
1306     * and then, render the layers targeted at the framebuffer
1307     */
1308
1309    const Vector< sp<LayerBase> >& layers(hw->getVisibleLayersSortedByZ());
1310    const size_t count = layers.size();
1311    const Transform& tr = hw->getTransform();
1312    if (cur != end) {
1313        // we're using h/w composer
1314        for (size_t i=0 ; i<count && cur!=end ; ++i, ++cur) {
1315            const sp<LayerBase>& layer(layers[i]);
1316            const Region clip(dirty.intersect(tr.transform(layer->visibleRegion)));
1317            if (!clip.isEmpty()) {
1318                switch (cur->getCompositionType()) {
1319                    case HWC_OVERLAY: {
1320                        if ((cur->getHints() & HWC_HINT_CLEAR_FB)
1321                                && i
1322                                && layer->isOpaque()
1323                                && hasGlesComposition) {
1324                            // never clear the very first layer since we're
1325                            // guaranteed the FB is already cleared
1326                            layer->clearWithOpenGL(hw, clip);
1327                        }
1328                        break;
1329                    }
1330                    case HWC_FRAMEBUFFER: {
1331                        layer->draw(hw, clip);
1332                        break;
1333                    }
1334                }
1335            }
1336            layer->setAcquireFence(hw, *cur);
1337        }
1338    } else {
1339        // we're not using h/w composer
1340        for (size_t i=0 ; i<count ; ++i) {
1341            const sp<LayerBase>& layer(layers[i]);
1342            const Region clip(dirty.intersect(
1343                    tr.transform(layer->visibleRegion)));
1344            if (!clip.isEmpty()) {
1345                layer->draw(hw, clip);
1346            }
1347        }
1348    }
1349}
1350
1351void SurfaceFlinger::drawWormhole(const sp<const DisplayDevice>& hw,
1352        const Region& region) const
1353{
1354    glDisable(GL_TEXTURE_EXTERNAL_OES);
1355    glDisable(GL_TEXTURE_2D);
1356    glDisable(GL_BLEND);
1357    glColor4f(0,0,0,0);
1358
1359    const int32_t height = hw->getHeight();
1360    Region::const_iterator it = region.begin();
1361    Region::const_iterator const end = region.end();
1362    while (it != end) {
1363        const Rect& r = *it++;
1364        GLfloat vertices[][2] = {
1365                { r.left,  height - r.top },
1366                { r.left,  height - r.bottom },
1367                { r.right, height - r.bottom },
1368                { r.right, height - r.top }
1369        };
1370        glVertexPointer(2, GL_FLOAT, 0, vertices);
1371        glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
1372    }
1373}
1374
1375ssize_t SurfaceFlinger::addClientLayer(const sp<Client>& client,
1376        const sp<LayerBaseClient>& lbc)
1377{
1378    // attach this layer to the client
1379    size_t name = client->attachLayer(lbc);
1380
1381    // add this layer to the current state list
1382    Mutex::Autolock _l(mStateLock);
1383    mCurrentState.layersSortedByZ.add(lbc);
1384
1385    return ssize_t(name);
1386}
1387
1388status_t SurfaceFlinger::removeLayer(const sp<LayerBase>& layer)
1389{
1390    Mutex::Autolock _l(mStateLock);
1391    status_t err = purgatorizeLayer_l(layer);
1392    if (err == NO_ERROR)
1393        setTransactionFlags(eTransactionNeeded);
1394    return err;
1395}
1396
1397status_t SurfaceFlinger::removeLayer_l(const sp<LayerBase>& layerBase)
1398{
1399    ssize_t index = mCurrentState.layersSortedByZ.remove(layerBase);
1400    if (index >= 0) {
1401        mLayersRemoved = true;
1402        return NO_ERROR;
1403    }
1404    return status_t(index);
1405}
1406
1407status_t SurfaceFlinger::purgatorizeLayer_l(const sp<LayerBase>& layerBase)
1408{
1409    // First add the layer to the purgatory list, which makes sure it won't
1410    // go away, then remove it from the main list (through a transaction).
1411    ssize_t err = removeLayer_l(layerBase);
1412    if (err >= 0) {
1413        mLayerPurgatory.add(layerBase);
1414    }
1415
1416    mLayersPendingRemoval.push(layerBase);
1417
1418    // it's possible that we don't find a layer, because it might
1419    // have been destroyed already -- this is not technically an error
1420    // from the user because there is a race between Client::destroySurface(),
1421    // ~Client() and ~ISurface().
1422    return (err == NAME_NOT_FOUND) ? status_t(NO_ERROR) : err;
1423}
1424
1425uint32_t SurfaceFlinger::peekTransactionFlags(uint32_t flags)
1426{
1427    return android_atomic_release_load(&mTransactionFlags);
1428}
1429
1430uint32_t SurfaceFlinger::getTransactionFlags(uint32_t flags)
1431{
1432    return android_atomic_and(~flags, &mTransactionFlags) & flags;
1433}
1434
1435uint32_t SurfaceFlinger::setTransactionFlags(uint32_t flags)
1436{
1437    uint32_t old = android_atomic_or(flags, &mTransactionFlags);
1438    if ((old & flags)==0) { // wake the server up
1439        signalTransaction();
1440    }
1441    return old;
1442}
1443
1444void SurfaceFlinger::setTransactionState(
1445        const Vector<ComposerState>& state,
1446        const Vector<DisplayState>& displays,
1447        uint32_t flags)
1448{
1449    Mutex::Autolock _l(mStateLock);
1450    uint32_t transactionFlags = 0;
1451
1452    size_t count = displays.size();
1453    for (size_t i=0 ; i<count ; i++) {
1454        const DisplayState& s(displays[i]);
1455        transactionFlags |= setDisplayStateLocked(s);
1456    }
1457
1458    count = state.size();
1459    for (size_t i=0 ; i<count ; i++) {
1460        const ComposerState& s(state[i]);
1461        sp<Client> client( static_cast<Client *>(s.client.get()) );
1462        transactionFlags |= setClientStateLocked(client, s.state);
1463    }
1464
1465    if (transactionFlags) {
1466        // this triggers the transaction
1467        setTransactionFlags(transactionFlags);
1468
1469        // if this is a synchronous transaction, wait for it to take effect
1470        // before returning.
1471        if (flags & eSynchronous) {
1472            mTransationPending = true;
1473        }
1474        while (mTransationPending) {
1475            status_t err = mTransactionCV.waitRelative(mStateLock, s2ns(5));
1476            if (CC_UNLIKELY(err != NO_ERROR)) {
1477                // just in case something goes wrong in SF, return to the
1478                // called after a few seconds.
1479                ALOGW_IF(err == TIMED_OUT, "closeGlobalTransaction timed out!");
1480                mTransationPending = false;
1481                break;
1482            }
1483        }
1484    }
1485}
1486
1487uint32_t SurfaceFlinger::setDisplayStateLocked(const DisplayState& s)
1488{
1489    uint32_t flags = 0;
1490    DisplayDeviceState& disp(mCurrentState.displays.editValueFor(s.token));
1491    if (disp.isValid()) {
1492        const uint32_t what = s.what;
1493        if (what & DisplayState::eSurfaceChanged) {
1494            if (disp.surface->asBinder() != s.surface->asBinder()) {
1495                disp.surface = s.surface;
1496                flags |= eDisplayTransactionNeeded;
1497            }
1498        }
1499        if (what & DisplayState::eLayerStackChanged) {
1500            if (disp.layerStack != s.layerStack) {
1501                disp.layerStack = s.layerStack;
1502                flags |= eDisplayTransactionNeeded;
1503            }
1504        }
1505        if (what & DisplayState::eOrientationChanged) {
1506            if (disp.orientation != s.orientation) {
1507                disp.orientation = s.orientation;
1508                flags |= eDisplayTransactionNeeded;
1509            }
1510        }
1511        if (what & DisplayState::eFrameChanged) {
1512            if (disp.frame != s.frame) {
1513                disp.frame = s.frame;
1514                flags |= eDisplayTransactionNeeded;
1515            }
1516        }
1517        if (what & DisplayState::eViewportChanged) {
1518            if (disp.viewport != s.viewport) {
1519                disp.viewport = s.viewport;
1520                flags |= eDisplayTransactionNeeded;
1521            }
1522        }
1523    }
1524    return flags;
1525}
1526
1527uint32_t SurfaceFlinger::setClientStateLocked(
1528        const sp<Client>& client,
1529        const layer_state_t& s)
1530{
1531    uint32_t flags = 0;
1532    sp<LayerBaseClient> layer(client->getLayerUser(s.surface));
1533    if (layer != 0) {
1534        const uint32_t what = s.what;
1535        if (what & layer_state_t::ePositionChanged) {
1536            if (layer->setPosition(s.x, s.y))
1537                flags |= eTraversalNeeded;
1538        }
1539        if (what & layer_state_t::eLayerChanged) {
1540            // NOTE: index needs to be calculated before we update the state
1541            ssize_t idx = mCurrentState.layersSortedByZ.indexOf(layer);
1542            if (layer->setLayer(s.z)) {
1543                mCurrentState.layersSortedByZ.removeAt(idx);
1544                mCurrentState.layersSortedByZ.add(layer);
1545                // we need traversal (state changed)
1546                // AND transaction (list changed)
1547                flags |= eTransactionNeeded|eTraversalNeeded;
1548            }
1549        }
1550        if (what & layer_state_t::eSizeChanged) {
1551            if (layer->setSize(s.w, s.h)) {
1552                flags |= eTraversalNeeded;
1553            }
1554        }
1555        if (what & layer_state_t::eAlphaChanged) {
1556            if (layer->setAlpha(uint8_t(255.0f*s.alpha+0.5f)))
1557                flags |= eTraversalNeeded;
1558        }
1559        if (what & layer_state_t::eMatrixChanged) {
1560            if (layer->setMatrix(s.matrix))
1561                flags |= eTraversalNeeded;
1562        }
1563        if (what & layer_state_t::eTransparentRegionChanged) {
1564            if (layer->setTransparentRegionHint(s.transparentRegion))
1565                flags |= eTraversalNeeded;
1566        }
1567        if (what & layer_state_t::eVisibilityChanged) {
1568            if (layer->setFlags(s.flags, s.mask))
1569                flags |= eTraversalNeeded;
1570        }
1571        if (what & layer_state_t::eCropChanged) {
1572            if (layer->setCrop(s.crop))
1573                flags |= eTraversalNeeded;
1574        }
1575        if (what & layer_state_t::eLayerStackChanged) {
1576            // NOTE: index needs to be calculated before we update the state
1577            ssize_t idx = mCurrentState.layersSortedByZ.indexOf(layer);
1578            if (layer->setLayerStack(s.layerStack)) {
1579                mCurrentState.layersSortedByZ.removeAt(idx);
1580                mCurrentState.layersSortedByZ.add(layer);
1581                // we need traversal (state changed)
1582                // AND transaction (list changed)
1583                flags |= eTransactionNeeded|eTraversalNeeded;
1584            }
1585        }
1586    }
1587    return flags;
1588}
1589
1590sp<ISurface> SurfaceFlinger::createLayer(
1591        ISurfaceComposerClient::surface_data_t* params,
1592        const String8& name,
1593        const sp<Client>& client,
1594       uint32_t w, uint32_t h, PixelFormat format,
1595        uint32_t flags)
1596{
1597    sp<LayerBaseClient> layer;
1598    sp<ISurface> surfaceHandle;
1599
1600    if (int32_t(w|h) < 0) {
1601        ALOGE("createLayer() failed, w or h is negative (w=%d, h=%d)",
1602                int(w), int(h));
1603        return surfaceHandle;
1604    }
1605
1606    //ALOGD("createLayer for (%d x %d), name=%s", w, h, name.string());
1607    switch (flags & ISurfaceComposerClient::eFXSurfaceMask) {
1608        case ISurfaceComposerClient::eFXSurfaceNormal:
1609            layer = createNormalLayer(client, w, h, flags, format);
1610            break;
1611        case ISurfaceComposerClient::eFXSurfaceBlur:
1612        case ISurfaceComposerClient::eFXSurfaceDim:
1613            layer = createDimLayer(client, w, h, flags);
1614            break;
1615        case ISurfaceComposerClient::eFXSurfaceScreenshot:
1616            layer = createScreenshotLayer(client, w, h, flags);
1617            break;
1618    }
1619
1620    if (layer != 0) {
1621        layer->initStates(w, h, flags);
1622        layer->setName(name);
1623        ssize_t token = addClientLayer(client, layer);
1624        surfaceHandle = layer->getSurface();
1625        if (surfaceHandle != 0) {
1626            params->token = token;
1627            params->identity = layer->getIdentity();
1628        }
1629        setTransactionFlags(eTransactionNeeded);
1630    }
1631
1632    return surfaceHandle;
1633}
1634
1635sp<Layer> SurfaceFlinger::createNormalLayer(
1636        const sp<Client>& client,
1637        uint32_t w, uint32_t h, uint32_t flags,
1638        PixelFormat& format)
1639{
1640    // initialize the surfaces
1641    switch (format) {
1642    case PIXEL_FORMAT_TRANSPARENT:
1643    case PIXEL_FORMAT_TRANSLUCENT:
1644        format = PIXEL_FORMAT_RGBA_8888;
1645        break;
1646    case PIXEL_FORMAT_OPAQUE:
1647#ifdef NO_RGBX_8888
1648        format = PIXEL_FORMAT_RGB_565;
1649#else
1650        format = PIXEL_FORMAT_RGBX_8888;
1651#endif
1652        break;
1653    }
1654
1655#ifdef NO_RGBX_8888
1656    if (format == PIXEL_FORMAT_RGBX_8888)
1657        format = PIXEL_FORMAT_RGBA_8888;
1658#endif
1659
1660    sp<Layer> layer = new Layer(this, client);
1661    status_t err = layer->setBuffers(w, h, format, flags);
1662    if (CC_LIKELY(err != NO_ERROR)) {
1663        ALOGE("createNormalLayer() failed (%s)", strerror(-err));
1664        layer.clear();
1665    }
1666    return layer;
1667}
1668
1669sp<LayerDim> SurfaceFlinger::createDimLayer(
1670        const sp<Client>& client,
1671        uint32_t w, uint32_t h, uint32_t flags)
1672{
1673    sp<LayerDim> layer = new LayerDim(this, client);
1674    return layer;
1675}
1676
1677sp<LayerScreenshot> SurfaceFlinger::createScreenshotLayer(
1678        const sp<Client>& client,
1679        uint32_t w, uint32_t h, uint32_t flags)
1680{
1681    sp<LayerScreenshot> layer = new LayerScreenshot(this, client);
1682    return layer;
1683}
1684
1685status_t SurfaceFlinger::onLayerRemoved(const sp<Client>& client, SurfaceID sid)
1686{
1687    /*
1688     * called by the window manager, when a surface should be marked for
1689     * destruction.
1690     *
1691     * The surface is removed from the current and drawing lists, but placed
1692     * in the purgatory queue, so it's not destroyed right-away (we need
1693     * to wait for all client's references to go away first).
1694     */
1695
1696    status_t err = NAME_NOT_FOUND;
1697    Mutex::Autolock _l(mStateLock);
1698    sp<LayerBaseClient> layer = client->getLayerUser(sid);
1699
1700    if (layer != 0) {
1701        err = purgatorizeLayer_l(layer);
1702        if (err == NO_ERROR) {
1703            setTransactionFlags(eTransactionNeeded);
1704        }
1705    }
1706    return err;
1707}
1708
1709status_t SurfaceFlinger::onLayerDestroyed(const wp<LayerBaseClient>& layer)
1710{
1711    // called by ~ISurface() when all references are gone
1712    status_t err = NO_ERROR;
1713    sp<LayerBaseClient> l(layer.promote());
1714    if (l != NULL) {
1715        Mutex::Autolock _l(mStateLock);
1716        err = removeLayer_l(l);
1717        if (err == NAME_NOT_FOUND) {
1718            // The surface wasn't in the current list, which means it was
1719            // removed already, which means it is in the purgatory,
1720            // and need to be removed from there.
1721            ssize_t idx = mLayerPurgatory.remove(l);
1722            ALOGE_IF(idx < 0,
1723                    "layer=%p is not in the purgatory list", l.get());
1724        }
1725        ALOGE_IF(err<0 && err != NAME_NOT_FOUND,
1726                "error removing layer=%p (%s)", l.get(), strerror(-err));
1727    }
1728    return err;
1729}
1730
1731// ---------------------------------------------------------------------------
1732
1733void SurfaceFlinger::onInitializeDisplays() {
1734    // reset screen orientation
1735    Vector<ComposerState> state;
1736    Vector<DisplayState> displays;
1737    DisplayState d;
1738    d.what = DisplayState::eOrientationChanged;
1739    d.token = mDefaultDisplays[DisplayDevice::DISPLAY_PRIMARY];
1740    d.orientation = DisplayState::eOrientationDefault;
1741    displays.add(d);
1742    setTransactionState(state, displays, 0);
1743
1744    // XXX: this should init default device to "unblank" and all other devices to "blank"
1745    onScreenAcquired();
1746}
1747
1748void SurfaceFlinger::initializeDisplays() {
1749    class MessageScreenInitialized : public MessageBase {
1750        SurfaceFlinger* flinger;
1751    public:
1752        MessageScreenInitialized(SurfaceFlinger* flinger) : flinger(flinger) { }
1753        virtual bool handler() {
1754            flinger->onInitializeDisplays();
1755            return true;
1756        }
1757    };
1758    sp<MessageBase> msg = new MessageScreenInitialized(this);
1759    postMessageAsync(msg);  // we may be called from main thread, use async message
1760}
1761
1762
1763void SurfaceFlinger::onScreenAcquired() {
1764    ALOGD("Screen about to return, flinger = %p", this);
1765    sp<const DisplayDevice> hw(getDefaultDisplayDevice()); // XXX: this should be per DisplayDevice
1766    getHwComposer().acquire();
1767    hw->acquireScreen();
1768    mEventThread->onScreenAcquired();
1769    mVisibleRegionsDirty = true;
1770    repaintEverything();
1771}
1772
1773void SurfaceFlinger::onScreenReleased() {
1774    ALOGD("About to give-up screen, flinger = %p", this);
1775    sp<const DisplayDevice> hw(getDefaultDisplayDevice()); // XXX: this should be per DisplayDevice
1776    if (hw->isScreenAcquired()) {
1777        mEventThread->onScreenReleased();
1778        hw->releaseScreen();
1779        getHwComposer().release();
1780        // from this point on, SF will stop drawing
1781    }
1782}
1783
1784void SurfaceFlinger::unblank() {
1785    class MessageScreenAcquired : public MessageBase {
1786        SurfaceFlinger* flinger;
1787    public:
1788        MessageScreenAcquired(SurfaceFlinger* flinger) : flinger(flinger) { }
1789        virtual bool handler() {
1790            flinger->onScreenAcquired();
1791            return true;
1792        }
1793    };
1794    sp<MessageBase> msg = new MessageScreenAcquired(this);
1795    postMessageSync(msg);
1796}
1797
1798void SurfaceFlinger::blank() {
1799    class MessageScreenReleased : public MessageBase {
1800        SurfaceFlinger* flinger;
1801    public:
1802        MessageScreenReleased(SurfaceFlinger* flinger) : flinger(flinger) { }
1803        virtual bool handler() {
1804            flinger->onScreenReleased();
1805            return true;
1806        }
1807    };
1808    sp<MessageBase> msg = new MessageScreenReleased(this);
1809    postMessageSync(msg);
1810}
1811
1812// ---------------------------------------------------------------------------
1813
1814status_t SurfaceFlinger::dump(int fd, const Vector<String16>& args)
1815{
1816    const size_t SIZE = 4096;
1817    char buffer[SIZE];
1818    String8 result;
1819
1820    if (!PermissionCache::checkCallingPermission(sDump)) {
1821        snprintf(buffer, SIZE, "Permission Denial: "
1822                "can't dump SurfaceFlinger from pid=%d, uid=%d\n",
1823                IPCThreadState::self()->getCallingPid(),
1824                IPCThreadState::self()->getCallingUid());
1825        result.append(buffer);
1826    } else {
1827        // Try to get the main lock, but don't insist if we can't
1828        // (this would indicate SF is stuck, but we want to be able to
1829        // print something in dumpsys).
1830        int retry = 3;
1831        while (mStateLock.tryLock()<0 && --retry>=0) {
1832            usleep(1000000);
1833        }
1834        const bool locked(retry >= 0);
1835        if (!locked) {
1836            snprintf(buffer, SIZE,
1837                    "SurfaceFlinger appears to be unresponsive, "
1838                    "dumping anyways (no locks held)\n");
1839            result.append(buffer);
1840        }
1841
1842        bool dumpAll = true;
1843        size_t index = 0;
1844        size_t numArgs = args.size();
1845        if (numArgs) {
1846            if ((index < numArgs) &&
1847                    (args[index] == String16("--list"))) {
1848                index++;
1849                listLayersLocked(args, index, result, buffer, SIZE);
1850                dumpAll = false;
1851            }
1852
1853            if ((index < numArgs) &&
1854                    (args[index] == String16("--latency"))) {
1855                index++;
1856                dumpStatsLocked(args, index, result, buffer, SIZE);
1857                dumpAll = false;
1858            }
1859
1860            if ((index < numArgs) &&
1861                    (args[index] == String16("--latency-clear"))) {
1862                index++;
1863                clearStatsLocked(args, index, result, buffer, SIZE);
1864                dumpAll = false;
1865            }
1866        }
1867
1868        if (dumpAll) {
1869            dumpAllLocked(result, buffer, SIZE);
1870        }
1871
1872        if (locked) {
1873            mStateLock.unlock();
1874        }
1875    }
1876    write(fd, result.string(), result.size());
1877    return NO_ERROR;
1878}
1879
1880void SurfaceFlinger::listLayersLocked(const Vector<String16>& args, size_t& index,
1881        String8& result, char* buffer, size_t SIZE) const
1882{
1883    const LayerVector& currentLayers = mCurrentState.layersSortedByZ;
1884    const size_t count = currentLayers.size();
1885    for (size_t i=0 ; i<count ; i++) {
1886        const sp<LayerBase>& layer(currentLayers[i]);
1887        snprintf(buffer, SIZE, "%s\n", layer->getName().string());
1888        result.append(buffer);
1889    }
1890}
1891
1892void SurfaceFlinger::dumpStatsLocked(const Vector<String16>& args, size_t& index,
1893        String8& result, char* buffer, size_t SIZE) const
1894{
1895    String8 name;
1896    if (index < args.size()) {
1897        name = String8(args[index]);
1898        index++;
1899    }
1900
1901    const LayerVector& currentLayers = mCurrentState.layersSortedByZ;
1902    const size_t count = currentLayers.size();
1903    for (size_t i=0 ; i<count ; i++) {
1904        const sp<LayerBase>& layer(currentLayers[i]);
1905        if (name.isEmpty()) {
1906            snprintf(buffer, SIZE, "%s\n", layer->getName().string());
1907            result.append(buffer);
1908        }
1909        if (name.isEmpty() || (name == layer->getName())) {
1910            layer->dumpStats(result, buffer, SIZE);
1911        }
1912    }
1913}
1914
1915void SurfaceFlinger::clearStatsLocked(const Vector<String16>& args, size_t& index,
1916        String8& result, char* buffer, size_t SIZE) const
1917{
1918    String8 name;
1919    if (index < args.size()) {
1920        name = String8(args[index]);
1921        index++;
1922    }
1923
1924    const LayerVector& currentLayers = mCurrentState.layersSortedByZ;
1925    const size_t count = currentLayers.size();
1926    for (size_t i=0 ; i<count ; i++) {
1927        const sp<LayerBase>& layer(currentLayers[i]);
1928        if (name.isEmpty() || (name == layer->getName())) {
1929            layer->clearStats();
1930        }
1931    }
1932}
1933
1934void SurfaceFlinger::dumpAllLocked(
1935        String8& result, char* buffer, size_t SIZE) const
1936{
1937    // figure out if we're stuck somewhere
1938    const nsecs_t now = systemTime();
1939    const nsecs_t inSwapBuffers(mDebugInSwapBuffers);
1940    const nsecs_t inTransaction(mDebugInTransaction);
1941    nsecs_t inSwapBuffersDuration = (inSwapBuffers) ? now-inSwapBuffers : 0;
1942    nsecs_t inTransactionDuration = (inTransaction) ? now-inTransaction : 0;
1943
1944    /*
1945     * Dump the visible layer list
1946     */
1947    const LayerVector& currentLayers = mCurrentState.layersSortedByZ;
1948    const size_t count = currentLayers.size();
1949    snprintf(buffer, SIZE, "Visible layers (count = %d)\n", count);
1950    result.append(buffer);
1951    for (size_t i=0 ; i<count ; i++) {
1952        const sp<LayerBase>& layer(currentLayers[i]);
1953        layer->dump(result, buffer, SIZE);
1954    }
1955
1956    /*
1957     * Dump the layers in the purgatory
1958     */
1959
1960    const size_t purgatorySize = mLayerPurgatory.size();
1961    snprintf(buffer, SIZE, "Purgatory state (%d entries)\n", purgatorySize);
1962    result.append(buffer);
1963    for (size_t i=0 ; i<purgatorySize ; i++) {
1964        const sp<LayerBase>& layer(mLayerPurgatory.itemAt(i));
1965        layer->shortDump(result, buffer, SIZE);
1966    }
1967
1968    /*
1969     * Dump Display state
1970     */
1971
1972    for (size_t dpy=0 ; dpy<mDisplays.size() ; dpy++) {
1973        const sp<const DisplayDevice>& hw(mDisplays[dpy]);
1974        snprintf(buffer, SIZE,
1975                "+ DisplayDevice[%u]\n"
1976                "   id=%x, layerStack=%u, (%4dx%4d), orient=%2d, tr=%08x, "
1977                "flips=%u, secure=%d, numLayers=%u\n",
1978                dpy,
1979                hw->getDisplayType(), hw->getLayerStack(),
1980                hw->getWidth(), hw->getHeight(),
1981                hw->getOrientation(), hw->getTransform().getType(),
1982                hw->getPageFlipCount(),
1983                hw->getSecureLayerVisible(),
1984                hw->getVisibleLayersSortedByZ().size());
1985        result.append(buffer);
1986    }
1987
1988    /*
1989     * Dump SurfaceFlinger global state
1990     */
1991
1992    snprintf(buffer, SIZE, "SurfaceFlinger global state:\n");
1993    result.append(buffer);
1994
1995    HWComposer& hwc(getHwComposer());
1996    sp<const DisplayDevice> hw(getDefaultDisplayDevice());
1997    const GLExtensions& extensions(GLExtensions::getInstance());
1998    snprintf(buffer, SIZE, "GLES: %s, %s, %s\n",
1999            extensions.getVendor(),
2000            extensions.getRenderer(),
2001            extensions.getVersion());
2002    result.append(buffer);
2003
2004    snprintf(buffer, SIZE, "EGL : %s\n",
2005            eglQueryString(mEGLDisplay, EGL_VERSION_HW_ANDROID));
2006    result.append(buffer);
2007
2008    snprintf(buffer, SIZE, "EXTS: %s\n", extensions.getExtension());
2009    result.append(buffer);
2010
2011    hw->undefinedRegion.dump(result, "undefinedRegion");
2012    snprintf(buffer, SIZE,
2013            "  orientation=%d, canDraw=%d\n",
2014            hw->getOrientation(), hw->canDraw());
2015    result.append(buffer);
2016    snprintf(buffer, SIZE,
2017            "  last eglSwapBuffers() time: %f us\n"
2018            "  last transaction time     : %f us\n"
2019            "  transaction-flags         : %08x\n"
2020            "  refresh-rate              : %f fps\n"
2021            "  x-dpi                     : %f\n"
2022            "  y-dpi                     : %f\n",
2023            mLastSwapBufferTime/1000.0,
2024            mLastTransactionTime/1000.0,
2025            mTransactionFlags,
2026            1e9 / hwc.getRefreshPeriod(),
2027            hwc.getDpiX(),
2028            hwc.getDpiY());
2029    result.append(buffer);
2030
2031    snprintf(buffer, SIZE, "  eglSwapBuffers time: %f us\n",
2032            inSwapBuffersDuration/1000.0);
2033    result.append(buffer);
2034
2035    snprintf(buffer, SIZE, "  transaction time: %f us\n",
2036            inTransactionDuration/1000.0);
2037    result.append(buffer);
2038
2039    /*
2040     * VSYNC state
2041     */
2042    mEventThread->dump(result, buffer, SIZE);
2043
2044    /*
2045     * Dump HWComposer state
2046     */
2047    snprintf(buffer, SIZE, "h/w composer state:\n");
2048    result.append(buffer);
2049    snprintf(buffer, SIZE, "  h/w composer %s and %s\n",
2050            hwc.initCheck()==NO_ERROR ? "present" : "not present",
2051                    (mDebugDisableHWC || mDebugRegion) ? "disabled" : "enabled");
2052    result.append(buffer);
2053    hwc.dump(result, buffer, SIZE, hw->getVisibleLayersSortedByZ());
2054
2055    /*
2056     * Dump gralloc state
2057     */
2058    const GraphicBufferAllocator& alloc(GraphicBufferAllocator::get());
2059    alloc.dump(result);
2060    hw->dump(result);
2061}
2062
2063status_t SurfaceFlinger::onTransact(
2064    uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
2065{
2066    switch (code) {
2067        case CREATE_CONNECTION:
2068        case SET_TRANSACTION_STATE:
2069        case BOOT_FINISHED:
2070        case BLANK:
2071        case UNBLANK:
2072        {
2073            // codes that require permission check
2074            IPCThreadState* ipc = IPCThreadState::self();
2075            const int pid = ipc->getCallingPid();
2076            const int uid = ipc->getCallingUid();
2077            if ((uid != AID_GRAPHICS) &&
2078                    !PermissionCache::checkPermission(sAccessSurfaceFlinger, pid, uid)) {
2079                ALOGE("Permission Denial: "
2080                        "can't access SurfaceFlinger pid=%d, uid=%d", pid, uid);
2081                return PERMISSION_DENIED;
2082            }
2083            break;
2084        }
2085        case CAPTURE_SCREEN:
2086        {
2087            // codes that require permission check
2088            IPCThreadState* ipc = IPCThreadState::self();
2089            const int pid = ipc->getCallingPid();
2090            const int uid = ipc->getCallingUid();
2091            if ((uid != AID_GRAPHICS) &&
2092                    !PermissionCache::checkPermission(sReadFramebuffer, pid, uid)) {
2093                ALOGE("Permission Denial: "
2094                        "can't read framebuffer pid=%d, uid=%d", pid, uid);
2095                return PERMISSION_DENIED;
2096            }
2097            break;
2098        }
2099    }
2100
2101    status_t err = BnSurfaceComposer::onTransact(code, data, reply, flags);
2102    if (err == UNKNOWN_TRANSACTION || err == PERMISSION_DENIED) {
2103        CHECK_INTERFACE(ISurfaceComposer, data, reply);
2104        if (CC_UNLIKELY(!PermissionCache::checkCallingPermission(sHardwareTest))) {
2105            IPCThreadState* ipc = IPCThreadState::self();
2106            const int pid = ipc->getCallingPid();
2107            const int uid = ipc->getCallingUid();
2108            ALOGE("Permission Denial: "
2109                    "can't access SurfaceFlinger pid=%d, uid=%d", pid, uid);
2110            return PERMISSION_DENIED;
2111        }
2112        int n;
2113        switch (code) {
2114            case 1000: // SHOW_CPU, NOT SUPPORTED ANYMORE
2115            case 1001: // SHOW_FPS, NOT SUPPORTED ANYMORE
2116                return NO_ERROR;
2117            case 1002:  // SHOW_UPDATES
2118                n = data.readInt32();
2119                mDebugRegion = n ? n : (mDebugRegion ? 0 : 1);
2120                invalidateHwcGeometry();
2121                repaintEverything();
2122                return NO_ERROR;
2123            case 1004:{ // repaint everything
2124                repaintEverything();
2125                return NO_ERROR;
2126            }
2127            case 1005:{ // force transaction
2128                setTransactionFlags(
2129                        eTransactionNeeded|
2130                        eDisplayTransactionNeeded|
2131                        eTraversalNeeded);
2132                return NO_ERROR;
2133            }
2134            case 1006:{ // send empty update
2135                signalRefresh();
2136                return NO_ERROR;
2137            }
2138            case 1008:  // toggle use of hw composer
2139                n = data.readInt32();
2140                mDebugDisableHWC = n ? 1 : 0;
2141                invalidateHwcGeometry();
2142                repaintEverything();
2143                return NO_ERROR;
2144            case 1009:  // toggle use of transform hint
2145                n = data.readInt32();
2146                mDebugDisableTransformHint = n ? 1 : 0;
2147                invalidateHwcGeometry();
2148                repaintEverything();
2149                return NO_ERROR;
2150            case 1010:  // interrogate.
2151                reply->writeInt32(0);
2152                reply->writeInt32(0);
2153                reply->writeInt32(mDebugRegion);
2154                reply->writeInt32(0);
2155                reply->writeInt32(mDebugDisableHWC);
2156                return NO_ERROR;
2157            case 1013: {
2158                Mutex::Autolock _l(mStateLock);
2159                sp<const DisplayDevice> hw(getDefaultDisplayDevice());
2160                reply->writeInt32(hw->getPageFlipCount());
2161            }
2162            return NO_ERROR;
2163        }
2164    }
2165    return err;
2166}
2167
2168void SurfaceFlinger::repaintEverything() {
2169    android_atomic_or(1, &mRepaintEverything);
2170    signalTransaction();
2171}
2172
2173// ---------------------------------------------------------------------------
2174
2175status_t SurfaceFlinger::renderScreenToTexture(uint32_t layerStack,
2176        GLuint* textureName, GLfloat* uOut, GLfloat* vOut)
2177{
2178    Mutex::Autolock _l(mStateLock);
2179    return renderScreenToTextureLocked(layerStack, textureName, uOut, vOut);
2180}
2181
2182status_t SurfaceFlinger::renderScreenToTextureLocked(uint32_t layerStack,
2183        GLuint* textureName, GLfloat* uOut, GLfloat* vOut)
2184{
2185    ATRACE_CALL();
2186
2187    if (!GLExtensions::getInstance().haveFramebufferObject())
2188        return INVALID_OPERATION;
2189
2190    // get screen geometry
2191    // FIXME: figure out what it means to have a screenshot texture w/ multi-display
2192    sp<const DisplayDevice> hw(getDefaultDisplayDevice());
2193    const uint32_t hw_w = hw->getWidth();
2194    const uint32_t hw_h = hw->getHeight();
2195    GLfloat u = 1;
2196    GLfloat v = 1;
2197
2198    // make sure to clear all GL error flags
2199    while ( glGetError() != GL_NO_ERROR ) ;
2200
2201    // create a FBO
2202    GLuint name, tname;
2203    glGenTextures(1, &tname);
2204    glBindTexture(GL_TEXTURE_2D, tname);
2205    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
2206    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
2207    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB,
2208            hw_w, hw_h, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
2209    if (glGetError() != GL_NO_ERROR) {
2210        while ( glGetError() != GL_NO_ERROR ) ;
2211        GLint tw = (2 << (31 - clz(hw_w)));
2212        GLint th = (2 << (31 - clz(hw_h)));
2213        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB,
2214                tw, th, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
2215        u = GLfloat(hw_w) / tw;
2216        v = GLfloat(hw_h) / th;
2217    }
2218    glGenFramebuffersOES(1, &name);
2219    glBindFramebufferOES(GL_FRAMEBUFFER_OES, name);
2220    glFramebufferTexture2DOES(GL_FRAMEBUFFER_OES,
2221            GL_COLOR_ATTACHMENT0_OES, GL_TEXTURE_2D, tname, 0);
2222
2223    // redraw the screen entirely...
2224    glDisable(GL_TEXTURE_EXTERNAL_OES);
2225    glDisable(GL_TEXTURE_2D);
2226    glClearColor(0,0,0,1);
2227    glClear(GL_COLOR_BUFFER_BIT);
2228    glMatrixMode(GL_MODELVIEW);
2229    glLoadIdentity();
2230    const Vector< sp<LayerBase> >& layers(hw->getVisibleLayersSortedByZ());
2231    const size_t count = layers.size();
2232    for (size_t i=0 ; i<count ; ++i) {
2233        const sp<LayerBase>& layer(layers[i]);
2234        layer->draw(hw);
2235    }
2236
2237    hw->compositionComplete();
2238
2239    // back to main framebuffer
2240    glBindFramebufferOES(GL_FRAMEBUFFER_OES, 0);
2241    glDeleteFramebuffersOES(1, &name);
2242
2243    *textureName = tname;
2244    *uOut = u;
2245    *vOut = v;
2246    return NO_ERROR;
2247}
2248
2249// ---------------------------------------------------------------------------
2250
2251status_t SurfaceFlinger::captureScreenImplLocked(const sp<IBinder>& display,
2252        sp<IMemoryHeap>* heap,
2253        uint32_t* w, uint32_t* h, PixelFormat* f,
2254        uint32_t sw, uint32_t sh,
2255        uint32_t minLayerZ, uint32_t maxLayerZ)
2256{
2257    ATRACE_CALL();
2258
2259    status_t result = PERMISSION_DENIED;
2260
2261    if (!GLExtensions::getInstance().haveFramebufferObject()) {
2262        return INVALID_OPERATION;
2263    }
2264
2265    // get screen geometry
2266    sp<const DisplayDevice> hw(getDisplayDevice(display));
2267    const uint32_t hw_w = hw->getWidth();
2268    const uint32_t hw_h = hw->getHeight();
2269
2270    // if we have secure windows on this display, never allow the screen capture
2271    if (hw->getSecureLayerVisible()) {
2272        ALOGW("FB is protected: PERMISSION_DENIED");
2273        return PERMISSION_DENIED;
2274    }
2275
2276    if ((sw > hw_w) || (sh > hw_h)) {
2277        ALOGE("size mismatch (%d, %d) > (%d, %d)", sw, sh, hw_w, hw_h);
2278        return BAD_VALUE;
2279    }
2280
2281    sw = (!sw) ? hw_w : sw;
2282    sh = (!sh) ? hw_h : sh;
2283    const size_t size = sw * sh * 4;
2284    const bool filtering = sw != hw_w || sh != hw_h;
2285
2286//    ALOGD("screenshot: sw=%d, sh=%d, minZ=%d, maxZ=%d",
2287//            sw, sh, minLayerZ, maxLayerZ);
2288
2289    // make sure to clear all GL error flags
2290    while ( glGetError() != GL_NO_ERROR ) ;
2291
2292    // create a FBO
2293    GLuint name, tname;
2294    glGenRenderbuffersOES(1, &tname);
2295    glBindRenderbufferOES(GL_RENDERBUFFER_OES, tname);
2296    glRenderbufferStorageOES(GL_RENDERBUFFER_OES, GL_RGBA8_OES, sw, sh);
2297
2298    glGenFramebuffersOES(1, &name);
2299    glBindFramebufferOES(GL_FRAMEBUFFER_OES, name);
2300    glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES,
2301            GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, tname);
2302
2303    GLenum status = glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES);
2304
2305    if (status == GL_FRAMEBUFFER_COMPLETE_OES) {
2306
2307        // invert everything, b/c glReadPixel() below will invert the FB
2308        glViewport(0, 0, sw, sh);
2309        glMatrixMode(GL_PROJECTION);
2310        glPushMatrix();
2311        glLoadIdentity();
2312        glOrthof(0, hw_w, hw_h, 0, 0, 1);
2313        glMatrixMode(GL_MODELVIEW);
2314
2315        // redraw the screen entirely...
2316        glClearColor(0,0,0,1);
2317        glClear(GL_COLOR_BUFFER_BIT);
2318
2319        const Vector< sp<LayerBase> >& layers(hw->getVisibleLayersSortedByZ());
2320        const size_t count = layers.size();
2321        for (size_t i=0 ; i<count ; ++i) {
2322            const sp<LayerBase>& layer(layers[i]);
2323            const uint32_t z = layer->drawingState().z;
2324            if (z >= minLayerZ && z <= maxLayerZ) {
2325                if (filtering) layer->setFiltering(true);
2326                layer->draw(hw);
2327                if (filtering) layer->setFiltering(false);
2328            }
2329        }
2330
2331        // check for errors and return screen capture
2332        if (glGetError() != GL_NO_ERROR) {
2333            // error while rendering
2334            result = INVALID_OPERATION;
2335        } else {
2336            // allocate shared memory large enough to hold the
2337            // screen capture
2338            sp<MemoryHeapBase> base(
2339                    new MemoryHeapBase(size, 0, "screen-capture") );
2340            void* const ptr = base->getBase();
2341            if (ptr) {
2342                // capture the screen with glReadPixels()
2343                ScopedTrace _t(ATRACE_TAG, "glReadPixels");
2344                glReadPixels(0, 0, sw, sh, GL_RGBA, GL_UNSIGNED_BYTE, ptr);
2345                if (glGetError() == GL_NO_ERROR) {
2346                    *heap = base;
2347                    *w = sw;
2348                    *h = sh;
2349                    *f = PIXEL_FORMAT_RGBA_8888;
2350                    result = NO_ERROR;
2351                }
2352            } else {
2353                result = NO_MEMORY;
2354            }
2355        }
2356        glViewport(0, 0, hw_w, hw_h);
2357        glMatrixMode(GL_PROJECTION);
2358        glPopMatrix();
2359        glMatrixMode(GL_MODELVIEW);
2360    } else {
2361        result = BAD_VALUE;
2362    }
2363
2364    // release FBO resources
2365    glBindFramebufferOES(GL_FRAMEBUFFER_OES, 0);
2366    glDeleteRenderbuffersOES(1, &tname);
2367    glDeleteFramebuffersOES(1, &name);
2368
2369    hw->compositionComplete();
2370
2371//    ALOGD("screenshot: result = %s", result<0 ? strerror(result) : "OK");
2372
2373    return result;
2374}
2375
2376
2377status_t SurfaceFlinger::captureScreen(const sp<IBinder>& display,
2378        sp<IMemoryHeap>* heap,
2379        uint32_t* width, uint32_t* height, PixelFormat* format,
2380        uint32_t sw, uint32_t sh,
2381        uint32_t minLayerZ, uint32_t maxLayerZ)
2382{
2383    if (CC_UNLIKELY(display == 0))
2384        return BAD_VALUE;
2385
2386    if (!GLExtensions::getInstance().haveFramebufferObject())
2387        return INVALID_OPERATION;
2388
2389    class MessageCaptureScreen : public MessageBase {
2390        SurfaceFlinger* flinger;
2391        sp<IBinder> display;
2392        sp<IMemoryHeap>* heap;
2393        uint32_t* w;
2394        uint32_t* h;
2395        PixelFormat* f;
2396        uint32_t sw;
2397        uint32_t sh;
2398        uint32_t minLayerZ;
2399        uint32_t maxLayerZ;
2400        status_t result;
2401    public:
2402        MessageCaptureScreen(SurfaceFlinger* flinger, const sp<IBinder>& display,
2403                sp<IMemoryHeap>* heap, uint32_t* w, uint32_t* h, PixelFormat* f,
2404                uint32_t sw, uint32_t sh,
2405                uint32_t minLayerZ, uint32_t maxLayerZ)
2406            : flinger(flinger), display(display),
2407              heap(heap), w(w), h(h), f(f), sw(sw), sh(sh),
2408              minLayerZ(minLayerZ), maxLayerZ(maxLayerZ),
2409              result(PERMISSION_DENIED)
2410        {
2411        }
2412        status_t getResult() const {
2413            return result;
2414        }
2415        virtual bool handler() {
2416            Mutex::Autolock _l(flinger->mStateLock);
2417            result = flinger->captureScreenImplLocked(display,
2418                    heap, w, h, f, sw, sh, minLayerZ, maxLayerZ);
2419            return true;
2420        }
2421    };
2422
2423    sp<MessageBase> msg = new MessageCaptureScreen(this,
2424            display, heap, width, height, format, sw, sh, minLayerZ, maxLayerZ);
2425    status_t res = postMessageSync(msg);
2426    if (res == NO_ERROR) {
2427        res = static_cast<MessageCaptureScreen*>( msg.get() )->getResult();
2428    }
2429    return res;
2430}
2431
2432// ---------------------------------------------------------------------------
2433
2434SurfaceFlinger::LayerVector::LayerVector() {
2435}
2436
2437SurfaceFlinger::LayerVector::LayerVector(const LayerVector& rhs)
2438    : SortedVector<sp<LayerBase> >(rhs) {
2439}
2440
2441int SurfaceFlinger::LayerVector::do_compare(const void* lhs,
2442    const void* rhs) const
2443{
2444    // sort layers per layer-stack, then by z-order and finally by sequence
2445    const sp<LayerBase>& l(*reinterpret_cast<const sp<LayerBase>*>(lhs));
2446    const sp<LayerBase>& r(*reinterpret_cast<const sp<LayerBase>*>(rhs));
2447
2448    uint32_t ls = l->currentState().layerStack;
2449    uint32_t rs = r->currentState().layerStack;
2450    if (ls != rs)
2451        return ls - rs;
2452
2453    uint32_t lz = l->currentState().z;
2454    uint32_t rz = r->currentState().z;
2455    if (lz != rz)
2456        return lz - rz;
2457
2458    return l->sequence - r->sequence;
2459}
2460
2461// ---------------------------------------------------------------------------
2462
2463SurfaceFlinger::DisplayDeviceState::DisplayDeviceState()
2464    : type(DisplayDevice::DISPLAY_ID_INVALID) {
2465}
2466
2467SurfaceFlinger::DisplayDeviceState::DisplayDeviceState(DisplayDevice::DisplayType type)
2468    : type(type), layerStack(0), orientation(0) {
2469}
2470
2471// ---------------------------------------------------------------------------
2472
2473GraphicBufferAlloc::GraphicBufferAlloc() {}
2474
2475GraphicBufferAlloc::~GraphicBufferAlloc() {}
2476
2477sp<GraphicBuffer> GraphicBufferAlloc::createGraphicBuffer(uint32_t w, uint32_t h,
2478        PixelFormat format, uint32_t usage, status_t* error) {
2479    sp<GraphicBuffer> graphicBuffer(new GraphicBuffer(w, h, format, usage));
2480    status_t err = graphicBuffer->initCheck();
2481    *error = err;
2482    if (err != 0 || graphicBuffer->handle == 0) {
2483        if (err == NO_MEMORY) {
2484            GraphicBuffer::dumpAllocationsToSystemLog();
2485        }
2486        ALOGE("GraphicBufferAlloc::createGraphicBuffer(w=%d, h=%d) "
2487             "failed (%s), handle=%p",
2488                w, h, strerror(-err), graphicBuffer->handle);
2489        return 0;
2490    }
2491    return graphicBuffer;
2492}
2493
2494// ---------------------------------------------------------------------------
2495
2496}; // namespace android
2497