SurfaceFlinger.cpp revision 53ade0853ca003c9e917b5e7d34e1b1338d7b87d 
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(intptr_t(token.get())); // FIXME: we shouldn't use the address for the id
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::DISPLAY_ID_COUNT) {
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::DISPLAY_ID_COUNT ; i++) {
401        mDefaultDisplays[i] = new BBinder();
402        mCurrentState.displays.add(mDefaultDisplays[i], DisplayDeviceState(i));
403    }
404    sp<DisplayDevice> hw = new DisplayDevice(this,
405            DisplayDevice::DISPLAY_ID_MAIN, HWC_DISPLAY_PRIMARY,
406            anw, fbs, mEGLConfig);
407    mDisplays.add(hw->getDisplayId(), hw);
408
409    //  initialize OpenGL ES
410    EGLSurface surface = hw->getEGLSurface();
411    initializeGL(mEGLDisplay, surface);
412
413    // start the EventThread
414    mEventThread = new EventThread(this);
415    mEventQueue.setEventThread(mEventThread);
416
417    // initialize the H/W composer
418    mHwc = new HWComposer(this,
419            *static_cast<HWComposer::EventHandler *>(this),
420            fbs->getFbHal());
421
422    // initialize our drawing state
423    mDrawingState = mCurrentState;
424
425    // We're now ready to accept clients...
426    mReadyToRunBarrier.open();
427
428    // set initial conditions (e.g. unblank default device)
429    initializeDisplays();
430
431    // start boot animation
432    startBootAnim();
433
434    return NO_ERROR;
435}
436
437void SurfaceFlinger::startBootAnim() {
438    // start boot animation
439    property_set("service.bootanim.exit", "0");
440    property_set("ctl.start", "bootanim");
441}
442
443uint32_t SurfaceFlinger::getMaxTextureSize() const {
444    return mMaxTextureSize;
445}
446
447uint32_t SurfaceFlinger::getMaxViewportDims() const {
448    return mMaxViewportDims[0] < mMaxViewportDims[1] ?
449            mMaxViewportDims[0] : mMaxViewportDims[1];
450}
451
452// ----------------------------------------------------------------------------
453
454bool SurfaceFlinger::authenticateSurfaceTexture(
455        const sp<ISurfaceTexture>& surfaceTexture) const {
456    Mutex::Autolock _l(mStateLock);
457    sp<IBinder> surfaceTextureBinder(surfaceTexture->asBinder());
458
459    // Check the visible layer list for the ISurface
460    const LayerVector& currentLayers = mCurrentState.layersSortedByZ;
461    size_t count = currentLayers.size();
462    for (size_t i=0 ; i<count ; i++) {
463        const sp<LayerBase>& layer(currentLayers[i]);
464        sp<LayerBaseClient> lbc(layer->getLayerBaseClient());
465        if (lbc != NULL) {
466            wp<IBinder> lbcBinder = lbc->getSurfaceTextureBinder();
467            if (lbcBinder == surfaceTextureBinder) {
468                return true;
469            }
470        }
471    }
472
473    // Check the layers in the purgatory.  This check is here so that if a
474    // SurfaceTexture gets destroyed before all the clients are done using it,
475    // the error will not be reported as "surface XYZ is not authenticated", but
476    // will instead fail later on when the client tries to use the surface,
477    // which should be reported as "surface XYZ returned an -ENODEV".  The
478    // purgatorized layers are no less authentic than the visible ones, so this
479    // should not cause any harm.
480    size_t purgatorySize =  mLayerPurgatory.size();
481    for (size_t i=0 ; i<purgatorySize ; i++) {
482        const sp<LayerBase>& layer(mLayerPurgatory.itemAt(i));
483        sp<LayerBaseClient> lbc(layer->getLayerBaseClient());
484        if (lbc != NULL) {
485            wp<IBinder> lbcBinder = lbc->getSurfaceTextureBinder();
486            if (lbcBinder == surfaceTextureBinder) {
487                return true;
488            }
489        }
490    }
491
492    return false;
493}
494
495status_t SurfaceFlinger::getDisplayInfo(DisplayID dpy, DisplayInfo* info) {
496    // TODO: this is here only for compatibility -- should go away eventually.
497    if (uint32_t(dpy) >= 1) {
498        return BAD_INDEX;
499    }
500
501    const HWComposer& hwc(getHwComposer());
502    float xdpi = hwc.getDpiX();
503    float ydpi = hwc.getDpiY();
504
505    // TODO: Not sure if display density should handled by SF any longer
506    class Density {
507        static int getDensityFromProperty(char const* propName) {
508            char property[PROPERTY_VALUE_MAX];
509            int density = 0;
510            if (property_get(propName, property, NULL) > 0) {
511                density = atoi(property);
512            }
513            return density;
514        }
515    public:
516        static int getEmuDensity() {
517            return getDensityFromProperty("qemu.sf.lcd_density"); }
518        static int getBuildDensity()  {
519            return getDensityFromProperty("ro.sf.lcd_density"); }
520    };
521    // The density of the device is provided by a build property
522    float density = Density::getBuildDensity() / 160.0f;
523    if (density == 0) {
524        // the build doesn't provide a density -- this is wrong!
525        // use xdpi instead
526        ALOGE("ro.sf.lcd_density must be defined as a build property");
527        density = xdpi / 160.0f;
528    }
529    if (Density::getEmuDensity()) {
530        // if "qemu.sf.lcd_density" is specified, it overrides everything
531        xdpi = ydpi = density = Density::getEmuDensity();
532        density /= 160.0f;
533    }
534
535    sp<const DisplayDevice> hw(getDefaultDisplayDevice());
536    info->w = hw->getWidth();
537    info->h = hw->getHeight();
538    info->xdpi = xdpi;
539    info->ydpi = ydpi;
540    info->fps = float(1e9 / hwc.getRefreshPeriod());
541    info->density = density;
542    info->orientation = hw->getOrientation();
543    // TODO: this needs to go away (currently needed only by webkit)
544    getPixelFormatInfo(hw->getFormat(), &info->pixelFormatInfo);
545    return NO_ERROR;
546}
547
548// ----------------------------------------------------------------------------
549
550sp<IDisplayEventConnection> SurfaceFlinger::createDisplayEventConnection() {
551    return mEventThread->createEventConnection();
552}
553
554void SurfaceFlinger::connectDisplay(const sp<ISurfaceTexture> surface) {
555
556    sp<IBinder> token;
557    { // scope for the lock
558        Mutex::Autolock _l(mStateLock);
559        token = mExtDisplayToken;
560    }
561
562    if (token == 0) {
563        token = createDisplay();
564    }
565
566    { // scope for the lock
567        Mutex::Autolock _l(mStateLock);
568        if (surface == 0) {
569            // release our current display. we're guarantee to have
570            // a reference to it (token), while we hold the lock
571            mExtDisplayToken = 0;
572        } else {
573            mExtDisplayToken = token;
574        }
575
576        DisplayDeviceState& info(mCurrentState.displays.editValueFor(token));
577        info.surface = surface;
578        setTransactionFlags(eDisplayTransactionNeeded);
579    }
580}
581
582// ----------------------------------------------------------------------------
583
584void SurfaceFlinger::waitForEvent() {
585    mEventQueue.waitMessage();
586}
587
588void SurfaceFlinger::signalTransaction() {
589    mEventQueue.invalidate();
590}
591
592void SurfaceFlinger::signalLayerUpdate() {
593    mEventQueue.invalidate();
594}
595
596void SurfaceFlinger::signalRefresh() {
597    mEventQueue.refresh();
598}
599
600status_t SurfaceFlinger::postMessageAsync(const sp<MessageBase>& msg,
601        nsecs_t reltime, uint32_t flags) {
602    return mEventQueue.postMessage(msg, reltime);
603}
604
605status_t SurfaceFlinger::postMessageSync(const sp<MessageBase>& msg,
606        nsecs_t reltime, uint32_t flags) {
607    status_t res = mEventQueue.postMessage(msg, reltime);
608    if (res == NO_ERROR) {
609        msg->wait();
610    }
611    return res;
612}
613
614bool SurfaceFlinger::threadLoop() {
615    waitForEvent();
616    return true;
617}
618
619void SurfaceFlinger::onVSyncReceived(int dpy, nsecs_t timestamp) {
620    mEventThread->onVSyncReceived(dpy, timestamp);
621}
622
623void SurfaceFlinger::eventControl(int event, int enabled) {
624    getHwComposer().eventControl(event, enabled);
625}
626
627void SurfaceFlinger::onMessageReceived(int32_t what) {
628    ATRACE_CALL();
629    switch (what) {
630    case MessageQueue::INVALIDATE:
631        handleMessageTransaction();
632        handleMessageInvalidate();
633        signalRefresh();
634        break;
635    case MessageQueue::REFRESH:
636        handleMessageRefresh();
637        break;
638    }
639}
640
641void SurfaceFlinger::handleMessageTransaction() {
642    uint32_t transactionFlags = peekTransactionFlags(eTransactionMask);
643    if (transactionFlags) {
644        handleTransaction(transactionFlags);
645    }
646}
647
648void SurfaceFlinger::handleMessageInvalidate() {
649    ATRACE_CALL();
650    handlePageFlip();
651}
652
653void SurfaceFlinger::handleMessageRefresh() {
654    ATRACE_CALL();
655    preComposition();
656    rebuildLayerStacks();
657    setUpHWComposer();
658    doDebugFlashRegions();
659    doComposition();
660    postComposition();
661}
662
663void SurfaceFlinger::doDebugFlashRegions()
664{
665    // is debugging enabled
666    if (CC_LIKELY(!mDebugRegion))
667        return;
668
669    const bool repaintEverything = mRepaintEverything;
670    for (size_t dpy=0 ; dpy<mDisplays.size() ; dpy++) {
671        const sp<DisplayDevice>& hw(mDisplays[dpy]);
672        if (hw->canDraw()) {
673            // transform the dirty region into this screen's coordinate space
674            const Region dirtyRegion(hw->getDirtyRegion(repaintEverything));
675            if (!dirtyRegion.isEmpty()) {
676                // redraw the whole screen
677                doComposeSurfaces(hw, Region(hw->bounds()));
678
679                // and draw the dirty region
680                glDisable(GL_TEXTURE_EXTERNAL_OES);
681                glDisable(GL_TEXTURE_2D);
682                glDisable(GL_BLEND);
683                glColor4f(1, 0, 1, 1);
684                const int32_t height = hw->getHeight();
685                Region::const_iterator it = dirtyRegion.begin();
686                Region::const_iterator const end = dirtyRegion.end();
687                while (it != end) {
688                    const Rect& r = *it++;
689                    GLfloat vertices[][2] = {
690                            { r.left,  height - r.top },
691                            { r.left,  height - r.bottom },
692                            { r.right, height - r.bottom },
693                            { r.right, height - r.top }
694                    };
695                    glVertexPointer(2, GL_FLOAT, 0, vertices);
696                    glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
697                }
698                hw->compositionComplete();
699                // FIXME
700                if (hw->getDisplayId() >= DisplayDevice::DISPLAY_ID_COUNT) {
701                    eglSwapBuffers(mEGLDisplay, hw->getEGLSurface());
702                }
703            }
704        }
705    }
706
707    postFramebuffer();
708
709    if (mDebugRegion > 1) {
710        usleep(mDebugRegion * 1000);
711    }
712}
713
714void SurfaceFlinger::preComposition()
715{
716    bool needExtraInvalidate = false;
717    const LayerVector& currentLayers(mDrawingState.layersSortedByZ);
718    const size_t count = currentLayers.size();
719    for (size_t i=0 ; i<count ; i++) {
720        if (currentLayers[i]->onPreComposition()) {
721            needExtraInvalidate = true;
722        }
723    }
724    if (needExtraInvalidate) {
725        signalLayerUpdate();
726    }
727}
728
729void SurfaceFlinger::postComposition()
730{
731    const LayerVector& currentLayers(mDrawingState.layersSortedByZ);
732    const size_t count = currentLayers.size();
733    for (size_t i=0 ; i<count ; i++) {
734        currentLayers[i]->onPostComposition();
735    }
736}
737
738void SurfaceFlinger::rebuildLayerStacks() {
739    // rebuild the visible layer list per screen
740    if (CC_UNLIKELY(mVisibleRegionsDirty)) {
741        ATRACE_CALL();
742        mVisibleRegionsDirty = false;
743        invalidateHwcGeometry();
744        const LayerVector& currentLayers(mDrawingState.layersSortedByZ);
745        for (size_t dpy=0 ; dpy<mDisplays.size() ; dpy++) {
746            const sp<DisplayDevice>& hw(mDisplays[dpy]);
747            Region opaqueRegion;
748            Region dirtyRegion;
749            computeVisibleRegions(currentLayers,
750                    hw->getLayerStack(), dirtyRegion, opaqueRegion);
751            hw->dirtyRegion.orSelf(dirtyRegion);
752
753            Vector< sp<LayerBase> > layersSortedByZ;
754            const size_t count = currentLayers.size();
755            for (size_t i=0 ; i<count ; i++) {
756                const Layer::State& s(currentLayers[i]->drawingState());
757                if (s.layerStack == hw->getLayerStack()) {
758                    if (!currentLayers[i]->visibleRegion.isEmpty()) {
759                        layersSortedByZ.add(currentLayers[i]);
760                    }
761                }
762            }
763            hw->setVisibleLayersSortedByZ(layersSortedByZ);
764            hw->undefinedRegion.set(hw->getBounds());
765            hw->undefinedRegion.subtractSelf(
766                    hw->getTransform().transform(opaqueRegion));
767        }
768    }
769}
770
771void SurfaceFlinger::setUpHWComposer() {
772    HWComposer& hwc(getHwComposer());
773    if (hwc.initCheck() == NO_ERROR) {
774        // build the h/w work list
775        const bool workListsDirty = mHwWorkListDirty;
776        mHwWorkListDirty = false;
777        for (size_t dpy=0 ; dpy<mDisplays.size() ; dpy++) {
778            sp<const DisplayDevice> hw(mDisplays[dpy]);
779            const int32_t id = hw->getHwcDisplayId();
780            if (id >= 0) {
781                const Vector< sp<LayerBase> >& currentLayers(
782                    hw->getVisibleLayersSortedByZ());
783                const size_t count = currentLayers.size();
784                if (hwc.createWorkList(id, count) >= 0) {
785                    HWComposer::LayerListIterator cur = hwc.begin(id);
786                    const HWComposer::LayerListIterator end = hwc.end(id);
787                    for (size_t i=0 ; cur!=end && i<count ; ++i, ++cur) {
788                        const sp<LayerBase>& layer(currentLayers[i]);
789
790                        if (CC_UNLIKELY(workListsDirty)) {
791                            layer->setGeometry(hw, *cur);
792                            if (mDebugDisableHWC || mDebugRegion) {
793                                cur->setSkip(true);
794                            }
795                        }
796
797                        /*
798                         * update the per-frame h/w composer data for each layer
799                         * and build the transparent region of the FB
800                         */
801                        layer->setPerFrameData(hw, *cur);
802                    }
803                }
804            }
805        }
806        status_t err = hwc.prepare();
807        ALOGE_IF(err, "HWComposer::prepare failed (%s)", strerror(-err));
808    }
809}
810
811void SurfaceFlinger::doComposition() {
812    ATRACE_CALL();
813    const bool repaintEverything = android_atomic_and(0, &mRepaintEverything);
814    for (size_t dpy=0 ; dpy<mDisplays.size() ; dpy++) {
815        const sp<DisplayDevice>& hw(mDisplays[dpy]);
816        if (hw->canDraw()) {
817            // transform the dirty region into this screen's coordinate space
818            const Region dirtyRegion(hw->getDirtyRegion(repaintEverything));
819            if (!dirtyRegion.isEmpty()) {
820                // repaint the framebuffer (if needed)
821                doDisplayComposition(hw, dirtyRegion);
822            }
823            hw->dirtyRegion.clear();
824            hw->flip(hw->swapRegion);
825            hw->swapRegion.clear();
826        }
827        // inform the h/w that we're done compositing
828        hw->compositionComplete();
829    }
830    postFramebuffer();
831}
832
833void SurfaceFlinger::postFramebuffer()
834{
835    ATRACE_CALL();
836
837    const nsecs_t now = systemTime();
838    mDebugInSwapBuffers = now;
839
840    HWComposer& hwc(getHwComposer());
841    if (hwc.initCheck() == NO_ERROR) {
842        // FIXME: EGL spec says:
843        //   "surface must be bound to the calling thread's current context,
844        //    for the current rendering API."
845        DisplayDevice::makeCurrent(
846                getDisplayDevice(DisplayDevice::DISPLAY_ID_MAIN), mEGLContext);
847        hwc.commit();
848    }
849
850    for (size_t dpy=0 ; dpy<mDisplays.size() ; dpy++) {
851        sp<const DisplayDevice> hw(mDisplays[dpy]);
852        const Vector< sp<LayerBase> >& currentLayers(hw->getVisibleLayersSortedByZ());
853        const size_t count = currentLayers.size();
854        int32_t id = hw->getHwcDisplayId();
855        if (id >=0 && hwc.initCheck() == NO_ERROR) {
856            HWComposer::LayerListIterator cur = hwc.begin(id);
857            const HWComposer::LayerListIterator end = hwc.end(id);
858            for (size_t i = 0; cur != end && i < count; ++i, ++cur) {
859                currentLayers[i]->onLayerDisplayed(hw, &*cur);
860            }
861        } else {
862            for (size_t i = 0; i < count; i++) {
863                currentLayers[i]->onLayerDisplayed(hw, NULL);
864            }
865        }
866    }
867
868    mLastSwapBufferTime = systemTime() - now;
869    mDebugInSwapBuffers = 0;
870}
871
872void SurfaceFlinger::handleTransaction(uint32_t transactionFlags)
873{
874    ATRACE_CALL();
875
876    Mutex::Autolock _l(mStateLock);
877    const nsecs_t now = systemTime();
878    mDebugInTransaction = now;
879
880    // Here we're guaranteed that some transaction flags are set
881    // so we can call handleTransactionLocked() unconditionally.
882    // We call getTransactionFlags(), which will also clear the flags,
883    // with mStateLock held to guarantee that mCurrentState won't change
884    // until the transaction is committed.
885
886    transactionFlags = getTransactionFlags(eTransactionMask);
887    handleTransactionLocked(transactionFlags);
888
889    mLastTransactionTime = systemTime() - now;
890    mDebugInTransaction = 0;
891    invalidateHwcGeometry();
892    // here the transaction has been committed
893}
894
895void SurfaceFlinger::handleTransactionLocked(uint32_t transactionFlags)
896{
897    const LayerVector& currentLayers(mCurrentState.layersSortedByZ);
898    const size_t count = currentLayers.size();
899
900    /*
901     * Traversal of the children
902     * (perform the transaction for each of them if needed)
903     */
904
905    if (transactionFlags & eTraversalNeeded) {
906        for (size_t i=0 ; i<count ; i++) {
907            const sp<LayerBase>& layer = currentLayers[i];
908            uint32_t trFlags = layer->getTransactionFlags(eTransactionNeeded);
909            if (!trFlags) continue;
910
911            const uint32_t flags = layer->doTransaction(0);
912            if (flags & Layer::eVisibleRegion)
913                mVisibleRegionsDirty = true;
914        }
915    }
916
917    /*
918     * Perform display own transactions if needed
919     */
920
921    if (transactionFlags & eDisplayTransactionNeeded) {
922        // here we take advantage of Vector's copy-on-write semantics to
923        // improve performance by skipping the transaction entirely when
924        // know that the lists are identical
925        const KeyedVector<  wp<IBinder>, DisplayDeviceState>& curr(mCurrentState.displays);
926        const KeyedVector<  wp<IBinder>, DisplayDeviceState>& draw(mDrawingState.displays);
927        if (!curr.isIdenticalTo(draw)) {
928            mVisibleRegionsDirty = true;
929            const size_t cc = curr.size();
930            const size_t dc = draw.size();
931
932            // find the displays that were removed
933            // (ie: in drawing state but not in current state)
934            // also handle displays that changed
935            // (ie: displays that are in both lists)
936            for (size_t i=0 ; i<dc ; i++) {
937                const ssize_t j = curr.indexOfKey(draw.keyAt(i));
938                if (j < 0) {
939                    // in drawing state but not in current state
940                    if (draw[i].id != DisplayDevice::DISPLAY_ID_MAIN) {
941                        mDisplays.removeItem(draw[i].id);
942                    } else {
943                        ALOGW("trying to remove the main display");
944                    }
945                } else {
946                    // this display is in both lists. see if something changed.
947                    const DisplayDeviceState& state(curr[j]);
948                    if (state.surface->asBinder() != draw[i].surface->asBinder()) {
949                        // changing the surface is like destroying and
950                        // recreating the DisplayDevice
951                        const int32_t hwcDisplayId =
952                            (uint32_t(state.id) < DisplayDevice::DISPLAY_ID_COUNT) ?
953                                state.id : getHwComposer().allocateDisplayId();
954
955                        sp<SurfaceTextureClient> stc(
956                                new SurfaceTextureClient(state.surface));
957
958                        sp<DisplayDevice> disp = new DisplayDevice(this,
959                            state.id, hwcDisplayId, stc, 0, mEGLConfig);
960
961                        disp->setLayerStack(state.layerStack);
962                        disp->setOrientation(state.orientation);
963                        // TODO: take viewport and frame into account
964                        mDisplays.replaceValueFor(state.id, disp);
965                    }
966                    if (state.layerStack != draw[i].layerStack) {
967                        const sp<DisplayDevice>& disp(getDisplayDevice(state.id));
968                        disp->setLayerStack(state.layerStack);
969                    }
970                    if (state.orientation != draw[i].orientation ||
971                        state.viewport != draw[i].viewport ||
972                        state.frame != draw[i].frame) {
973                        const sp<DisplayDevice>& disp(getDisplayDevice(state.id));
974                        disp->setOrientation(state.orientation);
975                        // TODO: take viewport and frame into account
976                    }
977                }
978            }
979
980            // find displays that were added
981            // (ie: in current state but not in drawing state)
982            for (size_t i=0 ; i<cc ; i++) {
983                if (draw.indexOfKey(curr.keyAt(i)) < 0) {
984                    const DisplayDeviceState& state(curr[i]);
985                    const int32_t hwcDisplayId =
986                        (uint32_t(state.id) < DisplayDevice::DISPLAY_ID_COUNT) ?
987                            state.id : getHwComposer().allocateDisplayId();
988
989                    sp<SurfaceTextureClient> stc(
990                            new SurfaceTextureClient(state.surface));
991                    sp<DisplayDevice> disp = new DisplayDevice(this,
992                        state.id, hwcDisplayId, stc, 0, mEGLConfig);
993                    mDisplays.add(state.id, disp);
994                }
995            }
996        }
997    }
998
999    /*
1000     * Perform our own transaction if needed
1001     */
1002
1003    const LayerVector& previousLayers(mDrawingState.layersSortedByZ);
1004    if (currentLayers.size() > previousLayers.size()) {
1005        // layers have been added
1006        mVisibleRegionsDirty = true;
1007    }
1008
1009    // some layers might have been removed, so
1010    // we need to update the regions they're exposing.
1011    if (mLayersRemoved) {
1012        mLayersRemoved = false;
1013        mVisibleRegionsDirty = true;
1014        const size_t count = previousLayers.size();
1015        for (size_t i=0 ; i<count ; i++) {
1016            const sp<LayerBase>& layer(previousLayers[i]);
1017            if (currentLayers.indexOf(layer) < 0) {
1018                // this layer is not visible anymore
1019                // TODO: we could traverse the tree from front to back and
1020                //       compute the actual visible region
1021                // TODO: we could cache the transformed region
1022                Layer::State front(layer->drawingState());
1023                Region visibleReg = front.transform.transform(
1024                        Region(Rect(front.active.w, front.active.h)));
1025                invalidateLayerStack(front.layerStack, visibleReg);
1026            }
1027        }
1028    }
1029
1030    commitTransaction();
1031}
1032
1033void SurfaceFlinger::commitTransaction()
1034{
1035    if (!mLayersPendingRemoval.isEmpty()) {
1036        // Notify removed layers now that they can't be drawn from
1037        for (size_t i = 0; i < mLayersPendingRemoval.size(); i++) {
1038            mLayersPendingRemoval[i]->onRemoved();
1039        }
1040        mLayersPendingRemoval.clear();
1041    }
1042
1043    mDrawingState = mCurrentState;
1044    mTransationPending = false;
1045    mTransactionCV.broadcast();
1046}
1047
1048void SurfaceFlinger::computeVisibleRegions(
1049        const LayerVector& currentLayers, uint32_t layerStack,
1050        Region& outDirtyRegion, Region& outOpaqueRegion)
1051{
1052    ATRACE_CALL();
1053
1054    Region aboveOpaqueLayers;
1055    Region aboveCoveredLayers;
1056    Region dirty;
1057
1058    outDirtyRegion.clear();
1059
1060    size_t i = currentLayers.size();
1061    while (i--) {
1062        const sp<LayerBase>& layer = currentLayers[i];
1063
1064        // start with the whole surface at its current location
1065        const Layer::State& s(layer->drawingState());
1066
1067        // only consider the layers on the given later stack
1068        if (s.layerStack != layerStack)
1069            continue;
1070
1071        /*
1072         * opaqueRegion: area of a surface that is fully opaque.
1073         */
1074        Region opaqueRegion;
1075
1076        /*
1077         * visibleRegion: area of a surface that is visible on screen
1078         * and not fully transparent. This is essentially the layer's
1079         * footprint minus the opaque regions above it.
1080         * Areas covered by a translucent surface are considered visible.
1081         */
1082        Region visibleRegion;
1083
1084        /*
1085         * coveredRegion: area of a surface that is covered by all
1086         * visible regions above it (which includes the translucent areas).
1087         */
1088        Region coveredRegion;
1089
1090
1091        // handle hidden surfaces by setting the visible region to empty
1092        if (CC_LIKELY(!(s.flags & layer_state_t::eLayerHidden) && s.alpha)) {
1093            const bool translucent = !layer->isOpaque();
1094            Rect bounds(layer->computeBounds());
1095            visibleRegion.set(bounds);
1096            if (!visibleRegion.isEmpty()) {
1097                // Remove the transparent area from the visible region
1098                if (translucent) {
1099                    Region transparentRegionScreen;
1100                    const Transform tr(s.transform);
1101                    if (tr.transformed()) {
1102                        if (tr.preserveRects()) {
1103                            // transform the transparent region
1104                            transparentRegionScreen = tr.transform(s.transparentRegion);
1105                        } else {
1106                            // transformation too complex, can't do the
1107                            // transparent region optimization.
1108                            transparentRegionScreen.clear();
1109                        }
1110                    } else {
1111                        transparentRegionScreen = s.transparentRegion;
1112                    }
1113                    visibleRegion.subtractSelf(transparentRegionScreen);
1114                }
1115
1116                // compute the opaque region
1117                const int32_t layerOrientation = s.transform.getOrientation();
1118                if (s.alpha==255 && !translucent &&
1119                        ((layerOrientation & Transform::ROT_INVALID) == false)) {
1120                    // the opaque region is the layer's footprint
1121                    opaqueRegion = visibleRegion;
1122                }
1123            }
1124        }
1125
1126        // Clip the covered region to the visible region
1127        coveredRegion = aboveCoveredLayers.intersect(visibleRegion);
1128
1129        // Update aboveCoveredLayers for next (lower) layer
1130        aboveCoveredLayers.orSelf(visibleRegion);
1131
1132        // subtract the opaque region covered by the layers above us
1133        visibleRegion.subtractSelf(aboveOpaqueLayers);
1134
1135        // compute this layer's dirty region
1136        if (layer->contentDirty) {
1137            // we need to invalidate the whole region
1138            dirty = visibleRegion;
1139            // as well, as the old visible region
1140            dirty.orSelf(layer->visibleRegion);
1141            layer->contentDirty = false;
1142        } else {
1143            /* compute the exposed region:
1144             *   the exposed region consists of two components:
1145             *   1) what's VISIBLE now and was COVERED before
1146             *   2) what's EXPOSED now less what was EXPOSED before
1147             *
1148             * note that (1) is conservative, we start with the whole
1149             * visible region but only keep what used to be covered by
1150             * something -- which mean it may have been exposed.
1151             *
1152             * (2) handles areas that were not covered by anything but got
1153             * exposed because of a resize.
1154             */
1155            const Region newExposed = visibleRegion - coveredRegion;
1156            const Region oldVisibleRegion = layer->visibleRegion;
1157            const Region oldCoveredRegion = layer->coveredRegion;
1158            const Region oldExposed = oldVisibleRegion - oldCoveredRegion;
1159            dirty = (visibleRegion&oldCoveredRegion) | (newExposed-oldExposed);
1160        }
1161        dirty.subtractSelf(aboveOpaqueLayers);
1162
1163        // accumulate to the screen dirty region
1164        outDirtyRegion.orSelf(dirty);
1165
1166        // Update aboveOpaqueLayers for next (lower) layer
1167        aboveOpaqueLayers.orSelf(opaqueRegion);
1168
1169        // Store the visible region is screen space
1170        layer->setVisibleRegion(visibleRegion);
1171        layer->setCoveredRegion(coveredRegion);
1172    }
1173
1174    outOpaqueRegion = aboveOpaqueLayers;
1175}
1176
1177void SurfaceFlinger::invalidateLayerStack(uint32_t layerStack,
1178        const Region& dirty) {
1179    for (size_t dpy=0 ; dpy<mDisplays.size() ; dpy++) {
1180        const sp<DisplayDevice>& hw(mDisplays[dpy]);
1181        if (hw->getLayerStack() == layerStack) {
1182            hw->dirtyRegion.orSelf(dirty);
1183        }
1184    }
1185}
1186
1187void SurfaceFlinger::handlePageFlip()
1188{
1189    Region dirtyRegion;
1190
1191    bool visibleRegions = false;
1192    const LayerVector& currentLayers(mDrawingState.layersSortedByZ);
1193    const size_t count = currentLayers.size();
1194    for (size_t i=0 ; i<count ; i++) {
1195        const sp<LayerBase>& layer(currentLayers[i]);
1196        const Region dirty(layer->latchBuffer(visibleRegions));
1197        Layer::State s(layer->drawingState());
1198        invalidateLayerStack(s.layerStack, dirty);
1199    }
1200
1201    mVisibleRegionsDirty |= visibleRegions;
1202}
1203
1204void SurfaceFlinger::invalidateHwcGeometry()
1205{
1206    mHwWorkListDirty = true;
1207}
1208
1209
1210void SurfaceFlinger::doDisplayComposition(const sp<const DisplayDevice>& hw,
1211        const Region& inDirtyRegion)
1212{
1213    Region dirtyRegion(inDirtyRegion);
1214
1215    // compute the invalid region
1216    hw->swapRegion.orSelf(dirtyRegion);
1217
1218    uint32_t flags = hw->getFlags();
1219    if (flags & DisplayDevice::SWAP_RECTANGLE) {
1220        // we can redraw only what's dirty, but since SWAP_RECTANGLE only
1221        // takes a rectangle, we must make sure to update that whole
1222        // rectangle in that case
1223        dirtyRegion.set(hw->swapRegion.bounds());
1224    } else {
1225        if (flags & DisplayDevice::PARTIAL_UPDATES) {
1226            // We need to redraw the rectangle that will be updated
1227            // (pushed to the framebuffer).
1228            // This is needed because PARTIAL_UPDATES only takes one
1229            // rectangle instead of a region (see DisplayDevice::flip())
1230            dirtyRegion.set(hw->swapRegion.bounds());
1231        } else {
1232            // we need to redraw everything (the whole screen)
1233            dirtyRegion.set(hw->bounds());
1234            hw->swapRegion = dirtyRegion;
1235        }
1236    }
1237
1238    doComposeSurfaces(hw, dirtyRegion);
1239
1240    // FIXME: we need to call eglSwapBuffers() on displays that have
1241    // GL composition and only on those.
1242    // however, currently hwc.commit() already does that for the main
1243    // display and never for the other ones
1244    if (hw->getDisplayId() >= DisplayDevice::DISPLAY_ID_COUNT) {
1245        // FIXME: EGL spec says:
1246        //   "surface must be bound to the calling thread's current context,
1247        //    for the current rendering API."
1248        eglSwapBuffers(mEGLDisplay, hw->getEGLSurface());
1249    }
1250
1251    // update the swap region and clear the dirty region
1252    hw->swapRegion.orSelf(dirtyRegion);
1253}
1254
1255void SurfaceFlinger::doComposeSurfaces(const sp<const DisplayDevice>& hw, const Region& dirty)
1256{
1257    HWComposer& hwc(getHwComposer());
1258    int32_t id = hw->getHwcDisplayId();
1259    HWComposer::LayerListIterator cur = hwc.begin(id);
1260    const HWComposer::LayerListIterator end = hwc.end(id);
1261
1262    const bool hasGlesComposition = hwc.hasGlesComposition(id);
1263    const bool hasHwcComposition = hwc.hasHwcComposition(id);
1264    if (cur==end || hasGlesComposition) {
1265
1266        DisplayDevice::makeCurrent(hw, mEGLContext);
1267
1268        // set the frame buffer
1269        glMatrixMode(GL_MODELVIEW);
1270        glLoadIdentity();
1271
1272        // Never touch the framebuffer if we don't have any framebuffer layers
1273        if (hasHwcComposition) {
1274            // when using overlays, we assume a fully transparent framebuffer
1275            // NOTE: we could reduce how much we need to clear, for instance
1276            // remove where there are opaque FB layers. however, on some
1277            // GPUs doing a "clean slate" glClear might be more efficient.
1278            // We'll revisit later if needed.
1279            glClearColor(0, 0, 0, 0);
1280            glClear(GL_COLOR_BUFFER_BIT);
1281        } else {
1282            const Region region(hw->undefinedRegion.intersect(dirty));
1283            // screen is already cleared here
1284            if (!region.isEmpty()) {
1285                // can happen with SurfaceView
1286                drawWormhole(region);
1287            }
1288        }
1289
1290        /*
1291         * and then, render the layers targeted at the framebuffer
1292         */
1293
1294        const Vector< sp<LayerBase> >& layers(hw->getVisibleLayersSortedByZ());
1295        const size_t count = layers.size();
1296        const Transform& tr = hw->getTransform();
1297        for (size_t i=0 ; i<count ; ++i) {
1298            const sp<LayerBase>& layer(layers[i]);
1299            const Region clip(dirty.intersect(tr.transform(layer->visibleRegion)));
1300            if (cur != end) {
1301                // we're using h/w composer
1302                if (!clip.isEmpty()) {
1303                    if (cur->getCompositionType() == HWC_OVERLAY) {
1304                        if (i && (cur->getHints() & HWC_HINT_CLEAR_FB)
1305                                && layer->isOpaque()) {
1306                            // never clear the very first layer since we're
1307                            // guaranteed the FB is already cleared
1308                            layer->clearWithOpenGL(hw, clip);
1309                        }
1310                    } else {
1311                        layer->draw(hw, clip);
1312                    }
1313                    layer->setAcquireFence(hw, *cur);
1314                }
1315                ++cur;
1316            } else {
1317                // we're not using h/w composer
1318                if (!clip.isEmpty()) {
1319                    layer->draw(hw, clip);
1320                }
1321            }
1322        }
1323    }
1324}
1325
1326void SurfaceFlinger::drawWormhole(const Region& region) const
1327{
1328    glDisable(GL_TEXTURE_EXTERNAL_OES);
1329    glDisable(GL_TEXTURE_2D);
1330    glDisable(GL_BLEND);
1331    glColor4f(0,0,0,0);
1332
1333    GLfloat vertices[4][2];
1334    glVertexPointer(2, GL_FLOAT, 0, vertices);
1335    Region::const_iterator it = region.begin();
1336    Region::const_iterator const end = region.end();
1337    while (it != end) {
1338        const Rect& r = *it++;
1339        vertices[0][0] = r.left;
1340        vertices[0][1] = r.top;
1341        vertices[1][0] = r.right;
1342        vertices[1][1] = r.top;
1343        vertices[2][0] = r.right;
1344        vertices[2][1] = r.bottom;
1345        vertices[3][0] = r.left;
1346        vertices[3][1] = r.bottom;
1347        glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
1348    }
1349}
1350
1351ssize_t SurfaceFlinger::addClientLayer(const sp<Client>& client,
1352        const sp<LayerBaseClient>& lbc)
1353{
1354    // attach this layer to the client
1355    size_t name = client->attachLayer(lbc);
1356
1357    // add this layer to the current state list
1358    Mutex::Autolock _l(mStateLock);
1359    mCurrentState.layersSortedByZ.add(lbc);
1360
1361    return ssize_t(name);
1362}
1363
1364status_t SurfaceFlinger::removeLayer(const sp<LayerBase>& layer)
1365{
1366    Mutex::Autolock _l(mStateLock);
1367    status_t err = purgatorizeLayer_l(layer);
1368    if (err == NO_ERROR)
1369        setTransactionFlags(eTransactionNeeded);
1370    return err;
1371}
1372
1373status_t SurfaceFlinger::removeLayer_l(const sp<LayerBase>& layerBase)
1374{
1375    ssize_t index = mCurrentState.layersSortedByZ.remove(layerBase);
1376    if (index >= 0) {
1377        mLayersRemoved = true;
1378        return NO_ERROR;
1379    }
1380    return status_t(index);
1381}
1382
1383status_t SurfaceFlinger::purgatorizeLayer_l(const sp<LayerBase>& layerBase)
1384{
1385    // First add the layer to the purgatory list, which makes sure it won't
1386    // go away, then remove it from the main list (through a transaction).
1387    ssize_t err = removeLayer_l(layerBase);
1388    if (err >= 0) {
1389        mLayerPurgatory.add(layerBase);
1390    }
1391
1392    mLayersPendingRemoval.push(layerBase);
1393
1394    // it's possible that we don't find a layer, because it might
1395    // have been destroyed already -- this is not technically an error
1396    // from the user because there is a race between Client::destroySurface(),
1397    // ~Client() and ~ISurface().
1398    return (err == NAME_NOT_FOUND) ? status_t(NO_ERROR) : err;
1399}
1400
1401uint32_t SurfaceFlinger::peekTransactionFlags(uint32_t flags)
1402{
1403    return android_atomic_release_load(&mTransactionFlags);
1404}
1405
1406uint32_t SurfaceFlinger::getTransactionFlags(uint32_t flags)
1407{
1408    return android_atomic_and(~flags, &mTransactionFlags) & flags;
1409}
1410
1411uint32_t SurfaceFlinger::setTransactionFlags(uint32_t flags)
1412{
1413    uint32_t old = android_atomic_or(flags, &mTransactionFlags);
1414    if ((old & flags)==0) { // wake the server up
1415        signalTransaction();
1416    }
1417    return old;
1418}
1419
1420void SurfaceFlinger::setTransactionState(
1421        const Vector<ComposerState>& state,
1422        const Vector<DisplayState>& displays,
1423        uint32_t flags)
1424{
1425    Mutex::Autolock _l(mStateLock);
1426    uint32_t transactionFlags = 0;
1427
1428    size_t count = displays.size();
1429    for (size_t i=0 ; i<count ; i++) {
1430        const DisplayState& s(displays[i]);
1431        transactionFlags |= setDisplayStateLocked(s);
1432    }
1433
1434    count = state.size();
1435    for (size_t i=0 ; i<count ; i++) {
1436        const ComposerState& s(state[i]);
1437        sp<Client> client( static_cast<Client *>(s.client.get()) );
1438        transactionFlags |= setClientStateLocked(client, s.state);
1439    }
1440
1441    if (transactionFlags) {
1442        // this triggers the transaction
1443        setTransactionFlags(transactionFlags);
1444
1445        // if this is a synchronous transaction, wait for it to take effect
1446        // before returning.
1447        if (flags & eSynchronous) {
1448            mTransationPending = true;
1449        }
1450        while (mTransationPending) {
1451            status_t err = mTransactionCV.waitRelative(mStateLock, s2ns(5));
1452            if (CC_UNLIKELY(err != NO_ERROR)) {
1453                // just in case something goes wrong in SF, return to the
1454                // called after a few seconds.
1455                ALOGW_IF(err == TIMED_OUT, "closeGlobalTransaction timed out!");
1456                mTransationPending = false;
1457                break;
1458            }
1459        }
1460    }
1461}
1462
1463uint32_t SurfaceFlinger::setDisplayStateLocked(const DisplayState& s)
1464{
1465    uint32_t flags = 0;
1466    DisplayDeviceState& disp(mCurrentState.displays.editValueFor(s.token));
1467    if (disp.id >= 0) {
1468        const uint32_t what = s.what;
1469        if (what & DisplayState::eSurfaceChanged) {
1470            if (disp.surface->asBinder() != s.surface->asBinder()) {
1471                disp.surface = s.surface;
1472                flags |= eDisplayTransactionNeeded;
1473            }
1474        }
1475        if (what & DisplayState::eLayerStackChanged) {
1476            if (disp.layerStack != s.layerStack) {
1477                disp.layerStack = s.layerStack;
1478                flags |= eDisplayTransactionNeeded;
1479            }
1480        }
1481        if (what & DisplayState::eOrientationChanged) {
1482            if (disp.orientation != s.orientation) {
1483                disp.orientation = s.orientation;
1484                flags |= eDisplayTransactionNeeded;
1485            }
1486        }
1487        if (what & DisplayState::eFrameChanged) {
1488            if (disp.frame != s.frame) {
1489                disp.frame = s.frame;
1490                flags |= eDisplayTransactionNeeded;
1491            }
1492        }
1493        if (what & DisplayState::eViewportChanged) {
1494            if (disp.viewport != s.viewport) {
1495                disp.viewport = s.viewport;
1496                flags |= eDisplayTransactionNeeded;
1497            }
1498        }
1499    }
1500    return flags;
1501}
1502
1503uint32_t SurfaceFlinger::setClientStateLocked(
1504        const sp<Client>& client,
1505        const layer_state_t& s)
1506{
1507    uint32_t flags = 0;
1508    sp<LayerBaseClient> layer(client->getLayerUser(s.surface));
1509    if (layer != 0) {
1510        const uint32_t what = s.what;
1511        if (what & layer_state_t::ePositionChanged) {
1512            if (layer->setPosition(s.x, s.y))
1513                flags |= eTraversalNeeded;
1514        }
1515        if (what & layer_state_t::eLayerChanged) {
1516            // NOTE: index needs to be calculated before we update the state
1517            ssize_t idx = mCurrentState.layersSortedByZ.indexOf(layer);
1518            if (layer->setLayer(s.z)) {
1519                mCurrentState.layersSortedByZ.removeAt(idx);
1520                mCurrentState.layersSortedByZ.add(layer);
1521                // we need traversal (state changed)
1522                // AND transaction (list changed)
1523                flags |= eTransactionNeeded|eTraversalNeeded;
1524            }
1525        }
1526        if (what & layer_state_t::eSizeChanged) {
1527            if (layer->setSize(s.w, s.h)) {
1528                flags |= eTraversalNeeded;
1529            }
1530        }
1531        if (what & layer_state_t::eAlphaChanged) {
1532            if (layer->setAlpha(uint8_t(255.0f*s.alpha+0.5f)))
1533                flags |= eTraversalNeeded;
1534        }
1535        if (what & layer_state_t::eMatrixChanged) {
1536            if (layer->setMatrix(s.matrix))
1537                flags |= eTraversalNeeded;
1538        }
1539        if (what & layer_state_t::eTransparentRegionChanged) {
1540            if (layer->setTransparentRegionHint(s.transparentRegion))
1541                flags |= eTraversalNeeded;
1542        }
1543        if (what & layer_state_t::eVisibilityChanged) {
1544            if (layer->setFlags(s.flags, s.mask))
1545                flags |= eTraversalNeeded;
1546        }
1547        if (what & layer_state_t::eCropChanged) {
1548            if (layer->setCrop(s.crop))
1549                flags |= eTraversalNeeded;
1550        }
1551        if (what & layer_state_t::eLayerStackChanged) {
1552            // NOTE: index needs to be calculated before we update the state
1553            ssize_t idx = mCurrentState.layersSortedByZ.indexOf(layer);
1554            if (layer->setLayerStack(s.layerStack)) {
1555                mCurrentState.layersSortedByZ.removeAt(idx);
1556                mCurrentState.layersSortedByZ.add(layer);
1557                // we need traversal (state changed)
1558                // AND transaction (list changed)
1559                flags |= eTransactionNeeded|eTraversalNeeded;
1560            }
1561        }
1562    }
1563    return flags;
1564}
1565
1566sp<ISurface> SurfaceFlinger::createLayer(
1567        ISurfaceComposerClient::surface_data_t* params,
1568        const String8& name,
1569        const sp<Client>& client,
1570        DisplayID d, uint32_t w, uint32_t h, PixelFormat format,
1571        uint32_t flags)
1572{
1573    sp<LayerBaseClient> layer;
1574    sp<ISurface> surfaceHandle;
1575
1576    if (int32_t(w|h) < 0) {
1577        ALOGE("createLayer() failed, w or h is negative (w=%d, h=%d)",
1578                int(w), int(h));
1579        return surfaceHandle;
1580    }
1581
1582    //ALOGD("createLayer for (%d x %d), name=%s", w, h, name.string());
1583    switch (flags & ISurfaceComposerClient::eFXSurfaceMask) {
1584        case ISurfaceComposerClient::eFXSurfaceNormal:
1585            layer = createNormalLayer(client, d, w, h, flags, format);
1586            break;
1587        case ISurfaceComposerClient::eFXSurfaceBlur:
1588        case ISurfaceComposerClient::eFXSurfaceDim:
1589            layer = createDimLayer(client, d, w, h, flags);
1590            break;
1591        case ISurfaceComposerClient::eFXSurfaceScreenshot:
1592            layer = createScreenshotLayer(client, d, w, h, flags);
1593            break;
1594    }
1595
1596    if (layer != 0) {
1597        layer->initStates(w, h, flags);
1598        layer->setName(name);
1599        ssize_t token = addClientLayer(client, layer);
1600        surfaceHandle = layer->getSurface();
1601        if (surfaceHandle != 0) {
1602            params->token = token;
1603            params->identity = layer->getIdentity();
1604        }
1605        setTransactionFlags(eTransactionNeeded);
1606    }
1607
1608    return surfaceHandle;
1609}
1610
1611sp<Layer> SurfaceFlinger::createNormalLayer(
1612        const sp<Client>& client, DisplayID display,
1613        uint32_t w, uint32_t h, uint32_t flags,
1614        PixelFormat& format)
1615{
1616    // initialize the surfaces
1617    switch (format) {
1618    case PIXEL_FORMAT_TRANSPARENT:
1619    case PIXEL_FORMAT_TRANSLUCENT:
1620        format = PIXEL_FORMAT_RGBA_8888;
1621        break;
1622    case PIXEL_FORMAT_OPAQUE:
1623#ifdef NO_RGBX_8888
1624        format = PIXEL_FORMAT_RGB_565;
1625#else
1626        format = PIXEL_FORMAT_RGBX_8888;
1627#endif
1628        break;
1629    }
1630
1631#ifdef NO_RGBX_8888
1632    if (format == PIXEL_FORMAT_RGBX_8888)
1633        format = PIXEL_FORMAT_RGBA_8888;
1634#endif
1635
1636    sp<Layer> layer = new Layer(this, display, client);
1637    status_t err = layer->setBuffers(w, h, format, flags);
1638    if (CC_LIKELY(err != NO_ERROR)) {
1639        ALOGE("createNormalLayer() failed (%s)", strerror(-err));
1640        layer.clear();
1641    }
1642    return layer;
1643}
1644
1645sp<LayerDim> SurfaceFlinger::createDimLayer(
1646        const sp<Client>& client, DisplayID display,
1647        uint32_t w, uint32_t h, uint32_t flags)
1648{
1649    sp<LayerDim> layer = new LayerDim(this, display, client);
1650    return layer;
1651}
1652
1653sp<LayerScreenshot> SurfaceFlinger::createScreenshotLayer(
1654        const sp<Client>& client, DisplayID display,
1655        uint32_t w, uint32_t h, uint32_t flags)
1656{
1657    sp<LayerScreenshot> layer = new LayerScreenshot(this, display, client);
1658    return layer;
1659}
1660
1661status_t SurfaceFlinger::onLayerRemoved(const sp<Client>& client, SurfaceID sid)
1662{
1663    /*
1664     * called by the window manager, when a surface should be marked for
1665     * destruction.
1666     *
1667     * The surface is removed from the current and drawing lists, but placed
1668     * in the purgatory queue, so it's not destroyed right-away (we need
1669     * to wait for all client's references to go away first).
1670     */
1671
1672    status_t err = NAME_NOT_FOUND;
1673    Mutex::Autolock _l(mStateLock);
1674    sp<LayerBaseClient> layer = client->getLayerUser(sid);
1675
1676    if (layer != 0) {
1677        err = purgatorizeLayer_l(layer);
1678        if (err == NO_ERROR) {
1679            setTransactionFlags(eTransactionNeeded);
1680        }
1681    }
1682    return err;
1683}
1684
1685status_t SurfaceFlinger::onLayerDestroyed(const wp<LayerBaseClient>& layer)
1686{
1687    // called by ~ISurface() when all references are gone
1688    status_t err = NO_ERROR;
1689    sp<LayerBaseClient> l(layer.promote());
1690    if (l != NULL) {
1691        Mutex::Autolock _l(mStateLock);
1692        err = removeLayer_l(l);
1693        if (err == NAME_NOT_FOUND) {
1694            // The surface wasn't in the current list, which means it was
1695            // removed already, which means it is in the purgatory,
1696            // and need to be removed from there.
1697            ssize_t idx = mLayerPurgatory.remove(l);
1698            ALOGE_IF(idx < 0,
1699                    "layer=%p is not in the purgatory list", l.get());
1700        }
1701        ALOGE_IF(err<0 && err != NAME_NOT_FOUND,
1702                "error removing layer=%p (%s)", l.get(), strerror(-err));
1703    }
1704    return err;
1705}
1706
1707// ---------------------------------------------------------------------------
1708
1709void SurfaceFlinger::onInitializeDisplays() {
1710    // reset screen orientation
1711    Vector<ComposerState> state;
1712    Vector<DisplayState> displays;
1713    DisplayState d;
1714    d.what = DisplayState::eOrientationChanged;
1715    d.token = mDefaultDisplays[DisplayDevice::DISPLAY_ID_MAIN];
1716    d.orientation = DisplayState::eOrientationDefault;
1717    displays.add(d);
1718    setTransactionState(state, displays, 0);
1719
1720    // XXX: this should init default device to "unblank" and all other devices to "blank"
1721    onScreenAcquired();
1722}
1723
1724void SurfaceFlinger::initializeDisplays() {
1725    class MessageScreenInitialized : public MessageBase {
1726        SurfaceFlinger* flinger;
1727    public:
1728        MessageScreenInitialized(SurfaceFlinger* flinger) : flinger(flinger) { }
1729        virtual bool handler() {
1730            flinger->onInitializeDisplays();
1731            return true;
1732        }
1733    };
1734    sp<MessageBase> msg = new MessageScreenInitialized(this);
1735    postMessageAsync(msg);  // we may be called from main thread, use async message
1736}
1737
1738
1739void SurfaceFlinger::onScreenAcquired() {
1740    ALOGD("Screen about to return, flinger = %p", this);
1741    sp<const DisplayDevice> hw(getDefaultDisplayDevice()); // XXX: this should be per DisplayDevice
1742    getHwComposer().acquire();
1743    hw->acquireScreen();
1744    mEventThread->onScreenAcquired();
1745    mVisibleRegionsDirty = true;
1746    repaintEverything();
1747}
1748
1749void SurfaceFlinger::onScreenReleased() {
1750    ALOGD("About to give-up screen, flinger = %p", this);
1751    sp<const DisplayDevice> hw(getDefaultDisplayDevice()); // XXX: this should be per DisplayDevice
1752    if (hw->isScreenAcquired()) {
1753        mEventThread->onScreenReleased();
1754        hw->releaseScreen();
1755        getHwComposer().release();
1756        // from this point on, SF will stop drawing
1757    }
1758}
1759
1760void SurfaceFlinger::unblank() {
1761    class MessageScreenAcquired : public MessageBase {
1762        SurfaceFlinger* flinger;
1763    public:
1764        MessageScreenAcquired(SurfaceFlinger* flinger) : flinger(flinger) { }
1765        virtual bool handler() {
1766            flinger->onScreenAcquired();
1767            return true;
1768        }
1769    };
1770    sp<MessageBase> msg = new MessageScreenAcquired(this);
1771    postMessageSync(msg);
1772}
1773
1774void SurfaceFlinger::blank() {
1775    class MessageScreenReleased : public MessageBase {
1776        SurfaceFlinger* flinger;
1777    public:
1778        MessageScreenReleased(SurfaceFlinger* flinger) : flinger(flinger) { }
1779        virtual bool handler() {
1780            flinger->onScreenReleased();
1781            return true;
1782        }
1783    };
1784    sp<MessageBase> msg = new MessageScreenReleased(this);
1785    postMessageSync(msg);
1786}
1787
1788// ---------------------------------------------------------------------------
1789
1790status_t SurfaceFlinger::dump(int fd, const Vector<String16>& args)
1791{
1792    const size_t SIZE = 4096;
1793    char buffer[SIZE];
1794    String8 result;
1795
1796    if (!PermissionCache::checkCallingPermission(sDump)) {
1797        snprintf(buffer, SIZE, "Permission Denial: "
1798                "can't dump SurfaceFlinger from pid=%d, uid=%d\n",
1799                IPCThreadState::self()->getCallingPid(),
1800                IPCThreadState::self()->getCallingUid());
1801        result.append(buffer);
1802    } else {
1803        // Try to get the main lock, but don't insist if we can't
1804        // (this would indicate SF is stuck, but we want to be able to
1805        // print something in dumpsys).
1806        int retry = 3;
1807        while (mStateLock.tryLock()<0 && --retry>=0) {
1808            usleep(1000000);
1809        }
1810        const bool locked(retry >= 0);
1811        if (!locked) {
1812            snprintf(buffer, SIZE,
1813                    "SurfaceFlinger appears to be unresponsive, "
1814                    "dumping anyways (no locks held)\n");
1815            result.append(buffer);
1816        }
1817
1818        bool dumpAll = true;
1819        size_t index = 0;
1820        size_t numArgs = args.size();
1821        if (numArgs) {
1822            if ((index < numArgs) &&
1823                    (args[index] == String16("--list"))) {
1824                index++;
1825                listLayersLocked(args, index, result, buffer, SIZE);
1826                dumpAll = false;
1827            }
1828
1829            if ((index < numArgs) &&
1830                    (args[index] == String16("--latency"))) {
1831                index++;
1832                dumpStatsLocked(args, index, result, buffer, SIZE);
1833                dumpAll = false;
1834            }
1835
1836            if ((index < numArgs) &&
1837                    (args[index] == String16("--latency-clear"))) {
1838                index++;
1839                clearStatsLocked(args, index, result, buffer, SIZE);
1840                dumpAll = false;
1841            }
1842        }
1843
1844        if (dumpAll) {
1845            dumpAllLocked(result, buffer, SIZE);
1846        }
1847
1848        if (locked) {
1849            mStateLock.unlock();
1850        }
1851    }
1852    write(fd, result.string(), result.size());
1853    return NO_ERROR;
1854}
1855
1856void SurfaceFlinger::listLayersLocked(const Vector<String16>& args, size_t& index,
1857        String8& result, char* buffer, size_t SIZE) const
1858{
1859    const LayerVector& currentLayers = mCurrentState.layersSortedByZ;
1860    const size_t count = currentLayers.size();
1861    for (size_t i=0 ; i<count ; i++) {
1862        const sp<LayerBase>& layer(currentLayers[i]);
1863        snprintf(buffer, SIZE, "%s\n", layer->getName().string());
1864        result.append(buffer);
1865    }
1866}
1867
1868void SurfaceFlinger::dumpStatsLocked(const Vector<String16>& args, size_t& index,
1869        String8& result, char* buffer, size_t SIZE) const
1870{
1871    String8 name;
1872    if (index < args.size()) {
1873        name = String8(args[index]);
1874        index++;
1875    }
1876
1877    const LayerVector& currentLayers = mCurrentState.layersSortedByZ;
1878    const size_t count = currentLayers.size();
1879    for (size_t i=0 ; i<count ; i++) {
1880        const sp<LayerBase>& layer(currentLayers[i]);
1881        if (name.isEmpty()) {
1882            snprintf(buffer, SIZE, "%s\n", layer->getName().string());
1883            result.append(buffer);
1884        }
1885        if (name.isEmpty() || (name == layer->getName())) {
1886            layer->dumpStats(result, buffer, SIZE);
1887        }
1888    }
1889}
1890
1891void SurfaceFlinger::clearStatsLocked(const Vector<String16>& args, size_t& index,
1892        String8& result, char* buffer, size_t SIZE) const
1893{
1894    String8 name;
1895    if (index < args.size()) {
1896        name = String8(args[index]);
1897        index++;
1898    }
1899
1900    const LayerVector& currentLayers = mCurrentState.layersSortedByZ;
1901    const size_t count = currentLayers.size();
1902    for (size_t i=0 ; i<count ; i++) {
1903        const sp<LayerBase>& layer(currentLayers[i]);
1904        if (name.isEmpty() || (name == layer->getName())) {
1905            layer->clearStats();
1906        }
1907    }
1908}
1909
1910void SurfaceFlinger::dumpAllLocked(
1911        String8& result, char* buffer, size_t SIZE) const
1912{
1913    // figure out if we're stuck somewhere
1914    const nsecs_t now = systemTime();
1915    const nsecs_t inSwapBuffers(mDebugInSwapBuffers);
1916    const nsecs_t inTransaction(mDebugInTransaction);
1917    nsecs_t inSwapBuffersDuration = (inSwapBuffers) ? now-inSwapBuffers : 0;
1918    nsecs_t inTransactionDuration = (inTransaction) ? now-inTransaction : 0;
1919
1920    /*
1921     * Dump the visible layer list
1922     */
1923    const LayerVector& currentLayers = mCurrentState.layersSortedByZ;
1924    const size_t count = currentLayers.size();
1925    snprintf(buffer, SIZE, "Visible layers (count = %d)\n", count);
1926    result.append(buffer);
1927    for (size_t i=0 ; i<count ; i++) {
1928        const sp<LayerBase>& layer(currentLayers[i]);
1929        layer->dump(result, buffer, SIZE);
1930    }
1931
1932    /*
1933     * Dump the layers in the purgatory
1934     */
1935
1936    const size_t purgatorySize = mLayerPurgatory.size();
1937    snprintf(buffer, SIZE, "Purgatory state (%d entries)\n", purgatorySize);
1938    result.append(buffer);
1939    for (size_t i=0 ; i<purgatorySize ; i++) {
1940        const sp<LayerBase>& layer(mLayerPurgatory.itemAt(i));
1941        layer->shortDump(result, buffer, SIZE);
1942    }
1943
1944    /*
1945     * Dump Display state
1946     */
1947
1948    for (size_t dpy=0 ; dpy<mDisplays.size() ; dpy++) {
1949        const sp<const DisplayDevice>& hw(mDisplays[dpy]);
1950        snprintf(buffer, SIZE,
1951                "+ DisplayDevice[%u]\n"
1952                "   id=%x, layerStack=%u, (%4dx%4d), orient=%2d, tr=%08x, "
1953                "flips=%u, secure=%d, numLayers=%u\n",
1954                dpy,
1955                hw->getDisplayId(), hw->getLayerStack(),
1956                hw->getWidth(), hw->getHeight(),
1957                hw->getOrientation(), hw->getTransform().getType(),
1958                hw->getPageFlipCount(),
1959                hw->getSecureLayerVisible(),
1960                hw->getVisibleLayersSortedByZ().size());
1961        result.append(buffer);
1962    }
1963
1964    /*
1965     * Dump SurfaceFlinger global state
1966     */
1967
1968    snprintf(buffer, SIZE, "SurfaceFlinger global state:\n");
1969    result.append(buffer);
1970
1971    HWComposer& hwc(getHwComposer());
1972    sp<const DisplayDevice> hw(getDefaultDisplayDevice());
1973    const GLExtensions& extensions(GLExtensions::getInstance());
1974    snprintf(buffer, SIZE, "GLES: %s, %s, %s\n",
1975            extensions.getVendor(),
1976            extensions.getRenderer(),
1977            extensions.getVersion());
1978    result.append(buffer);
1979
1980    snprintf(buffer, SIZE, "EGL : %s\n",
1981            eglQueryString(mEGLDisplay, EGL_VERSION_HW_ANDROID));
1982    result.append(buffer);
1983
1984    snprintf(buffer, SIZE, "EXTS: %s\n", extensions.getExtension());
1985    result.append(buffer);
1986
1987    hw->undefinedRegion.dump(result, "undefinedRegion");
1988    snprintf(buffer, SIZE,
1989            "  orientation=%d, canDraw=%d\n",
1990            hw->getOrientation(), hw->canDraw());
1991    result.append(buffer);
1992    snprintf(buffer, SIZE,
1993            "  last eglSwapBuffers() time: %f us\n"
1994            "  last transaction time     : %f us\n"
1995            "  transaction-flags         : %08x\n"
1996            "  refresh-rate              : %f fps\n"
1997            "  x-dpi                     : %f\n"
1998            "  y-dpi                     : %f\n",
1999            mLastSwapBufferTime/1000.0,
2000            mLastTransactionTime/1000.0,
2001            mTransactionFlags,
2002            1e9 / hwc.getRefreshPeriod(),
2003            hwc.getDpiX(),
2004            hwc.getDpiY());
2005    result.append(buffer);
2006
2007    snprintf(buffer, SIZE, "  eglSwapBuffers time: %f us\n",
2008            inSwapBuffersDuration/1000.0);
2009    result.append(buffer);
2010
2011    snprintf(buffer, SIZE, "  transaction time: %f us\n",
2012            inTransactionDuration/1000.0);
2013    result.append(buffer);
2014
2015    /*
2016     * VSYNC state
2017     */
2018    mEventThread->dump(result, buffer, SIZE);
2019
2020    /*
2021     * Dump HWComposer state
2022     */
2023    snprintf(buffer, SIZE, "h/w composer state:\n");
2024    result.append(buffer);
2025    snprintf(buffer, SIZE, "  h/w composer %s and %s\n",
2026            hwc.initCheck()==NO_ERROR ? "present" : "not present",
2027                    (mDebugDisableHWC || mDebugRegion) ? "disabled" : "enabled");
2028    result.append(buffer);
2029    hwc.dump(result, buffer, SIZE, hw->getVisibleLayersSortedByZ());
2030
2031    /*
2032     * Dump gralloc state
2033     */
2034    const GraphicBufferAllocator& alloc(GraphicBufferAllocator::get());
2035    alloc.dump(result);
2036    hw->dump(result);
2037}
2038
2039status_t SurfaceFlinger::onTransact(
2040    uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
2041{
2042    switch (code) {
2043        case CREATE_CONNECTION:
2044        case SET_TRANSACTION_STATE:
2045        case BOOT_FINISHED:
2046        case BLANK:
2047        case UNBLANK:
2048        {
2049            // codes that require permission check
2050            IPCThreadState* ipc = IPCThreadState::self();
2051            const int pid = ipc->getCallingPid();
2052            const int uid = ipc->getCallingUid();
2053            if ((uid != AID_GRAPHICS) &&
2054                    !PermissionCache::checkPermission(sAccessSurfaceFlinger, pid, uid)) {
2055                ALOGE("Permission Denial: "
2056                        "can't access SurfaceFlinger pid=%d, uid=%d", pid, uid);
2057                return PERMISSION_DENIED;
2058            }
2059            break;
2060        }
2061        case CAPTURE_SCREEN:
2062        {
2063            // codes that require permission check
2064            IPCThreadState* ipc = IPCThreadState::self();
2065            const int pid = ipc->getCallingPid();
2066            const int uid = ipc->getCallingUid();
2067            if ((uid != AID_GRAPHICS) &&
2068                    !PermissionCache::checkPermission(sReadFramebuffer, pid, uid)) {
2069                ALOGE("Permission Denial: "
2070                        "can't read framebuffer pid=%d, uid=%d", pid, uid);
2071                return PERMISSION_DENIED;
2072            }
2073            break;
2074        }
2075    }
2076
2077    status_t err = BnSurfaceComposer::onTransact(code, data, reply, flags);
2078    if (err == UNKNOWN_TRANSACTION || err == PERMISSION_DENIED) {
2079        CHECK_INTERFACE(ISurfaceComposer, data, reply);
2080        if (CC_UNLIKELY(!PermissionCache::checkCallingPermission(sHardwareTest))) {
2081            IPCThreadState* ipc = IPCThreadState::self();
2082            const int pid = ipc->getCallingPid();
2083            const int uid = ipc->getCallingUid();
2084            ALOGE("Permission Denial: "
2085                    "can't access SurfaceFlinger pid=%d, uid=%d", pid, uid);
2086            return PERMISSION_DENIED;
2087        }
2088        int n;
2089        switch (code) {
2090            case 1000: // SHOW_CPU, NOT SUPPORTED ANYMORE
2091            case 1001: // SHOW_FPS, NOT SUPPORTED ANYMORE
2092                return NO_ERROR;
2093            case 1002:  // SHOW_UPDATES
2094                n = data.readInt32();
2095                mDebugRegion = n ? n : (mDebugRegion ? 0 : 1);
2096                invalidateHwcGeometry();
2097                repaintEverything();
2098                return NO_ERROR;
2099            case 1004:{ // repaint everything
2100                repaintEverything();
2101                return NO_ERROR;
2102            }
2103            case 1005:{ // force transaction
2104                setTransactionFlags(
2105                        eTransactionNeeded|
2106                        eDisplayTransactionNeeded|
2107                        eTraversalNeeded);
2108                return NO_ERROR;
2109            }
2110            case 1006:{ // send empty update
2111                signalRefresh();
2112                return NO_ERROR;
2113            }
2114            case 1008:  // toggle use of hw composer
2115                n = data.readInt32();
2116                mDebugDisableHWC = n ? 1 : 0;
2117                invalidateHwcGeometry();
2118                repaintEverything();
2119                return NO_ERROR;
2120            case 1009:  // toggle use of transform hint
2121                n = data.readInt32();
2122                mDebugDisableTransformHint = n ? 1 : 0;
2123                invalidateHwcGeometry();
2124                repaintEverything();
2125                return NO_ERROR;
2126            case 1010:  // interrogate.
2127                reply->writeInt32(0);
2128                reply->writeInt32(0);
2129                reply->writeInt32(mDebugRegion);
2130                reply->writeInt32(0);
2131                reply->writeInt32(mDebugDisableHWC);
2132                return NO_ERROR;
2133            case 1013: {
2134                Mutex::Autolock _l(mStateLock);
2135                sp<const DisplayDevice> hw(getDefaultDisplayDevice());
2136                reply->writeInt32(hw->getPageFlipCount());
2137            }
2138            return NO_ERROR;
2139        }
2140    }
2141    return err;
2142}
2143
2144void SurfaceFlinger::repaintEverything() {
2145    android_atomic_or(1, &mRepaintEverything);
2146    signalTransaction();
2147}
2148
2149// ---------------------------------------------------------------------------
2150
2151status_t SurfaceFlinger::renderScreenToTexture(DisplayID dpy,
2152        GLuint* textureName, GLfloat* uOut, GLfloat* vOut)
2153{
2154    Mutex::Autolock _l(mStateLock);
2155    return renderScreenToTextureLocked(dpy, textureName, uOut, vOut);
2156}
2157
2158status_t SurfaceFlinger::renderScreenToTextureLocked(DisplayID dpy,
2159        GLuint* textureName, GLfloat* uOut, GLfloat* vOut)
2160{
2161    ATRACE_CALL();
2162
2163    if (!GLExtensions::getInstance().haveFramebufferObject())
2164        return INVALID_OPERATION;
2165
2166    // get screen geometry
2167    sp<const DisplayDevice> hw(getDisplayDevice(dpy));
2168    const uint32_t hw_w = hw->getWidth();
2169    const uint32_t hw_h = hw->getHeight();
2170    GLfloat u = 1;
2171    GLfloat v = 1;
2172
2173    // make sure to clear all GL error flags
2174    while ( glGetError() != GL_NO_ERROR ) ;
2175
2176    // create a FBO
2177    GLuint name, tname;
2178    glGenTextures(1, &tname);
2179    glBindTexture(GL_TEXTURE_2D, tname);
2180    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
2181    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
2182    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB,
2183            hw_w, hw_h, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
2184    if (glGetError() != GL_NO_ERROR) {
2185        while ( glGetError() != GL_NO_ERROR ) ;
2186        GLint tw = (2 << (31 - clz(hw_w)));
2187        GLint th = (2 << (31 - clz(hw_h)));
2188        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB,
2189                tw, th, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
2190        u = GLfloat(hw_w) / tw;
2191        v = GLfloat(hw_h) / th;
2192    }
2193    glGenFramebuffersOES(1, &name);
2194    glBindFramebufferOES(GL_FRAMEBUFFER_OES, name);
2195    glFramebufferTexture2DOES(GL_FRAMEBUFFER_OES,
2196            GL_COLOR_ATTACHMENT0_OES, GL_TEXTURE_2D, tname, 0);
2197
2198    // redraw the screen entirely...
2199    glDisable(GL_TEXTURE_EXTERNAL_OES);
2200    glDisable(GL_TEXTURE_2D);
2201    glClearColor(0,0,0,1);
2202    glClear(GL_COLOR_BUFFER_BIT);
2203    glMatrixMode(GL_MODELVIEW);
2204    glLoadIdentity();
2205    const Vector< sp<LayerBase> >& layers(hw->getVisibleLayersSortedByZ());
2206    const size_t count = layers.size();
2207    for (size_t i=0 ; i<count ; ++i) {
2208        const sp<LayerBase>& layer(layers[i]);
2209        layer->draw(hw);
2210    }
2211
2212    hw->compositionComplete();
2213
2214    // back to main framebuffer
2215    glBindFramebufferOES(GL_FRAMEBUFFER_OES, 0);
2216    glDeleteFramebuffersOES(1, &name);
2217
2218    *textureName = tname;
2219    *uOut = u;
2220    *vOut = v;
2221    return NO_ERROR;
2222}
2223
2224// ---------------------------------------------------------------------------
2225
2226status_t SurfaceFlinger::captureScreenImplLocked(DisplayID dpy,
2227        sp<IMemoryHeap>* heap,
2228        uint32_t* w, uint32_t* h, PixelFormat* f,
2229        uint32_t sw, uint32_t sh,
2230        uint32_t minLayerZ, uint32_t maxLayerZ)
2231{
2232    ATRACE_CALL();
2233
2234    status_t result = PERMISSION_DENIED;
2235
2236    // only one display supported for now
2237    if (CC_UNLIKELY(uint32_t(dpy) >= DISPLAY_COUNT)) {
2238        ALOGE("invalid display %d", dpy);
2239        return BAD_VALUE;
2240    }
2241
2242    if (!GLExtensions::getInstance().haveFramebufferObject()) {
2243        return INVALID_OPERATION;
2244    }
2245
2246    // get screen geometry
2247    sp<const DisplayDevice> hw(getDisplayDevice(dpy));
2248    const uint32_t hw_w = hw->getWidth();
2249    const uint32_t hw_h = hw->getHeight();
2250
2251    // if we have secure windows on this display, never allow the screen capture
2252    if (hw->getSecureLayerVisible()) {
2253        ALOGW("FB is protected: PERMISSION_DENIED");
2254        return PERMISSION_DENIED;
2255    }
2256
2257    if ((sw > hw_w) || (sh > hw_h)) {
2258        ALOGE("size mismatch (%d, %d) > (%d, %d)", sw, sh, hw_w, hw_h);
2259        return BAD_VALUE;
2260    }
2261
2262    sw = (!sw) ? hw_w : sw;
2263    sh = (!sh) ? hw_h : sh;
2264    const size_t size = sw * sh * 4;
2265    const bool filtering = sw != hw_w || sh != hw_h;
2266
2267//    ALOGD("screenshot: sw=%d, sh=%d, minZ=%d, maxZ=%d",
2268//            sw, sh, minLayerZ, maxLayerZ);
2269
2270    // make sure to clear all GL error flags
2271    while ( glGetError() != GL_NO_ERROR ) ;
2272
2273    // create a FBO
2274    GLuint name, tname;
2275    glGenRenderbuffersOES(1, &tname);
2276    glBindRenderbufferOES(GL_RENDERBUFFER_OES, tname);
2277    glRenderbufferStorageOES(GL_RENDERBUFFER_OES, GL_RGBA8_OES, sw, sh);
2278
2279    glGenFramebuffersOES(1, &name);
2280    glBindFramebufferOES(GL_FRAMEBUFFER_OES, name);
2281    glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES,
2282            GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, tname);
2283
2284    GLenum status = glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES);
2285
2286    if (status == GL_FRAMEBUFFER_COMPLETE_OES) {
2287
2288        // invert everything, b/c glReadPixel() below will invert the FB
2289        glViewport(0, 0, sw, sh);
2290        glMatrixMode(GL_PROJECTION);
2291        glPushMatrix();
2292        glLoadIdentity();
2293        glOrthof(0, hw_w, hw_h, 0, 0, 1);
2294        glMatrixMode(GL_MODELVIEW);
2295
2296        // redraw the screen entirely...
2297        glClearColor(0,0,0,1);
2298        glClear(GL_COLOR_BUFFER_BIT);
2299
2300        const LayerVector& layers(mDrawingState.layersSortedByZ);
2301        const size_t count = layers.size();
2302        for (size_t i=0 ; i<count ; ++i) {
2303            const sp<LayerBase>& layer(layers[i]);
2304            const uint32_t flags = layer->drawingState().flags;
2305            if (!(flags & layer_state_t::eLayerHidden)) {
2306                const uint32_t z = layer->drawingState().z;
2307                if (z >= minLayerZ && z <= maxLayerZ) {
2308                    if (filtering) layer->setFiltering(true);
2309                    layer->draw(hw);
2310                    if (filtering) layer->setFiltering(false);
2311                }
2312            }
2313        }
2314
2315        // check for errors and return screen capture
2316        if (glGetError() != GL_NO_ERROR) {
2317            // error while rendering
2318            result = INVALID_OPERATION;
2319        } else {
2320            // allocate shared memory large enough to hold the
2321            // screen capture
2322            sp<MemoryHeapBase> base(
2323                    new MemoryHeapBase(size, 0, "screen-capture") );
2324            void* const ptr = base->getBase();
2325            if (ptr) {
2326                // capture the screen with glReadPixels()
2327                ScopedTrace _t(ATRACE_TAG, "glReadPixels");
2328                glReadPixels(0, 0, sw, sh, GL_RGBA, GL_UNSIGNED_BYTE, ptr);
2329                if (glGetError() == GL_NO_ERROR) {
2330                    *heap = base;
2331                    *w = sw;
2332                    *h = sh;
2333                    *f = PIXEL_FORMAT_RGBA_8888;
2334                    result = NO_ERROR;
2335                }
2336            } else {
2337                result = NO_MEMORY;
2338            }
2339        }
2340        glViewport(0, 0, hw_w, hw_h);
2341        glMatrixMode(GL_PROJECTION);
2342        glPopMatrix();
2343        glMatrixMode(GL_MODELVIEW);
2344    } else {
2345        result = BAD_VALUE;
2346    }
2347
2348    // release FBO resources
2349    glBindFramebufferOES(GL_FRAMEBUFFER_OES, 0);
2350    glDeleteRenderbuffersOES(1, &tname);
2351    glDeleteFramebuffersOES(1, &name);
2352
2353    hw->compositionComplete();
2354
2355//    ALOGD("screenshot: result = %s", result<0 ? strerror(result) : "OK");
2356
2357    return result;
2358}
2359
2360
2361status_t SurfaceFlinger::captureScreen(DisplayID dpy,
2362        sp<IMemoryHeap>* heap,
2363        uint32_t* width, uint32_t* height, PixelFormat* format,
2364        uint32_t sw, uint32_t sh,
2365        uint32_t minLayerZ, uint32_t maxLayerZ)
2366{
2367    // only one display supported for now
2368    if (CC_UNLIKELY(uint32_t(dpy) >= DISPLAY_COUNT))
2369        return BAD_VALUE;
2370
2371    if (!GLExtensions::getInstance().haveFramebufferObject())
2372        return INVALID_OPERATION;
2373
2374    class MessageCaptureScreen : public MessageBase {
2375        SurfaceFlinger* flinger;
2376        DisplayID dpy;
2377        sp<IMemoryHeap>* heap;
2378        uint32_t* w;
2379        uint32_t* h;
2380        PixelFormat* f;
2381        uint32_t sw;
2382        uint32_t sh;
2383        uint32_t minLayerZ;
2384        uint32_t maxLayerZ;
2385        status_t result;
2386    public:
2387        MessageCaptureScreen(SurfaceFlinger* flinger, DisplayID dpy,
2388                sp<IMemoryHeap>* heap, uint32_t* w, uint32_t* h, PixelFormat* f,
2389                uint32_t sw, uint32_t sh,
2390                uint32_t minLayerZ, uint32_t maxLayerZ)
2391            : flinger(flinger), dpy(dpy),
2392              heap(heap), w(w), h(h), f(f), sw(sw), sh(sh),
2393              minLayerZ(minLayerZ), maxLayerZ(maxLayerZ),
2394              result(PERMISSION_DENIED)
2395        {
2396        }
2397        status_t getResult() const {
2398            return result;
2399        }
2400        virtual bool handler() {
2401            Mutex::Autolock _l(flinger->mStateLock);
2402            result = flinger->captureScreenImplLocked(dpy,
2403                    heap, w, h, f, sw, sh, minLayerZ, maxLayerZ);
2404            return true;
2405        }
2406    };
2407
2408    sp<MessageBase> msg = new MessageCaptureScreen(this,
2409            dpy, heap, width, height, format, sw, sh, minLayerZ, maxLayerZ);
2410    status_t res = postMessageSync(msg);
2411    if (res == NO_ERROR) {
2412        res = static_cast<MessageCaptureScreen*>( msg.get() )->getResult();
2413    }
2414    return res;
2415}
2416
2417// ---------------------------------------------------------------------------
2418
2419SurfaceFlinger::LayerVector::LayerVector() {
2420}
2421
2422SurfaceFlinger::LayerVector::LayerVector(const LayerVector& rhs)
2423    : SortedVector<sp<LayerBase> >(rhs) {
2424}
2425
2426int SurfaceFlinger::LayerVector::do_compare(const void* lhs,
2427    const void* rhs) const
2428{
2429    // sort layers per layer-stack, then by z-order and finally by sequence
2430    const sp<LayerBase>& l(*reinterpret_cast<const sp<LayerBase>*>(lhs));
2431    const sp<LayerBase>& r(*reinterpret_cast<const sp<LayerBase>*>(rhs));
2432
2433    uint32_t ls = l->currentState().layerStack;
2434    uint32_t rs = r->currentState().layerStack;
2435    if (ls != rs)
2436        return ls - rs;
2437
2438    uint32_t lz = l->currentState().z;
2439    uint32_t rz = r->currentState().z;
2440    if (lz != rz)
2441        return lz - rz;
2442
2443    return l->sequence - r->sequence;
2444}
2445
2446// ---------------------------------------------------------------------------
2447
2448SurfaceFlinger::DisplayDeviceState::DisplayDeviceState() : id(-1) {
2449}
2450
2451SurfaceFlinger::DisplayDeviceState::DisplayDeviceState(int32_t id)
2452    : id(id), layerStack(0), orientation(0) {
2453}
2454
2455// ---------------------------------------------------------------------------
2456
2457GraphicBufferAlloc::GraphicBufferAlloc() {}
2458
2459GraphicBufferAlloc::~GraphicBufferAlloc() {}
2460
2461sp<GraphicBuffer> GraphicBufferAlloc::createGraphicBuffer(uint32_t w, uint32_t h,
2462        PixelFormat format, uint32_t usage, status_t* error) {
2463    sp<GraphicBuffer> graphicBuffer(new GraphicBuffer(w, h, format, usage));
2464    status_t err = graphicBuffer->initCheck();
2465    *error = err;
2466    if (err != 0 || graphicBuffer->handle == 0) {
2467        if (err == NO_MEMORY) {
2468            GraphicBuffer::dumpAllocationsToSystemLog();
2469        }
2470        ALOGE("GraphicBufferAlloc::createGraphicBuffer(w=%d, h=%d) "
2471             "failed (%s), handle=%p",
2472                w, h, strerror(-err), graphicBuffer->handle);
2473        return 0;
2474    }
2475    return graphicBuffer;
2476}
2477
2478// ---------------------------------------------------------------------------
2479
2480}; // namespace android
2481