core/jni/android_view_SurfaceControl.cpp

/*
 * Copyright (C) 2013 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#define LOG_TAG "SurfaceControl"

#include <stdio.h>

#include "jni.h"
#include "JNIHelp.h"

#include "android_os_Parcel.h"
#include "android_util_Binder.h"
#include "android/graphics/GraphicsJNI.h"
#include "android/graphics/Region.h"

#include <android_runtime/AndroidRuntime.h>
#include <android_runtime/android_view_Surface.h>
#include <android_runtime/android_view_SurfaceSession.h>

#include <gui/Surface.h>
#include <gui/SurfaceComposerClient.h>

#include <ui/DisplayInfo.h>
#include <ui/FrameStats.h>
#include <ui/Rect.h>
#include <ui/Region.h>

#include <utils/Log.h>

#include <ScopedUtfChars.h>

// ----------------------------------------------------------------------------

namespace android {

static const char* const OutOfResourcesException =
    "android/view/Surface$OutOfResourcesException";

static struct {
    jfieldID width;
    jfieldID height;
    jfieldID refreshRate;
    jfieldID density;
    jfieldID xDpi;
    jfieldID yDpi;
    jfieldID secure;
} gPhysicalDisplayInfoClassInfo;

// Implements SkMallocPixelRef::ReleaseProc, to delete the screenshot on unref.
void DeleteScreenshot(void* addr, void* context) {
    SkASSERT(addr == ((ScreenshotClient*) context)->getPixels());
    delete ((ScreenshotClient*) context);
}

static struct {
    nsecs_t UNDEFINED_TIME_NANO;
    jmethodID init;
} gWindowContentFrameStatsClassInfo;

static struct {
    nsecs_t UNDEFINED_TIME_NANO;
    jmethodID init;
} gWindowAnimationFrameStatsClassInfo;

// ----------------------------------------------------------------------------

static jlong nativeCreate(JNIEnv* env, jclass clazz, jobject sessionObj,
        jstring nameStr, jint w, jint h, jint format, jint flags) {
    ScopedUtfChars name(env, nameStr);
    sp<SurfaceComposerClient> client(android_view_SurfaceSession_getClient(env, sessionObj));
    sp<SurfaceControl> surface = client->createSurface(
            String8(name.c_str()), w, h, format, flags);
    if (surface == NULL) {
        jniThrowException(env, OutOfResourcesException, NULL);
        return 0;
    }
    surface->incStrong((void *)nativeCreate);
    return reinterpret_cast<jlong>(surface.get());
}

static void nativeRelease(JNIEnv* env, jclass clazz, jlong nativeObject) {
    sp<SurfaceControl> ctrl(reinterpret_cast<SurfaceControl *>(nativeObject));
    ctrl->decStrong((void *)nativeCreate);
}

static void nativeDestroy(JNIEnv* env, jclass clazz, jlong nativeObject) {
    sp<SurfaceControl> ctrl(reinterpret_cast<SurfaceControl *>(nativeObject));
    ctrl->clear();
    ctrl->decStrong((void *)nativeCreate);
}

static jobject nativeScreenshotBitmap(JNIEnv* env, jclass clazz, jobject displayTokenObj,
        jint width, jint height, jint minLayer, jint maxLayer, bool allLayers,
        bool useIdentityTransform) {
    sp<IBinder> displayToken = ibinderForJavaObject(env, displayTokenObj);
    if (displayToken == NULL) {
        return NULL;
    }

    ScreenshotClient* screenshot = new ScreenshotClient();
    status_t res;
    if (width > 0 && height > 0) {
        if (allLayers) {
            res = screenshot->update(displayToken, width, height, useIdentityTransform);
        } else {
            res = screenshot->update(displayToken, width, height, minLayer, maxLayer,
                    useIdentityTransform);
        }
    } else {
        res = screenshot->update(displayToken, useIdentityTransform);
    }
    if (res != NO_ERROR) {
        delete screenshot;
        return NULL;
    }

    SkImageInfo screenshotInfo;
    screenshotInfo.fWidth = screenshot->getWidth();
    screenshotInfo.fHeight = screenshot->getHeight();

    switch (screenshot->getFormat()) {
        case PIXEL_FORMAT_RGBX_8888: {
            screenshotInfo.fColorType = kRGBA_8888_SkColorType;
            screenshotInfo.fAlphaType = kIgnore_SkAlphaType;
            break;
        }
        case PIXEL_FORMAT_RGBA_8888: {
            screenshotInfo.fColorType = kRGBA_8888_SkColorType;
            screenshotInfo.fAlphaType = kPremul_SkAlphaType;
            break;
        }
        case PIXEL_FORMAT_RGB_565: {
            screenshotInfo.fColorType = kRGB_565_SkColorType;
            screenshotInfo.fAlphaType = kIgnore_SkAlphaType;
            break;
        }
        default: {
            delete screenshot;
            return NULL;
        }
    }

    const ssize_t rowBytes =
            screenshot->getStride() * android::bytesPerPixel(screenshot->getFormat());

    SkBitmap* bitmap = new SkBitmap();
    bitmap->setConfig(screenshotInfo, (size_t)rowBytes);
    if (screenshotInfo.fWidth > 0 && screenshotInfo.fHeight > 0) {
        // takes ownership of ScreenshotClient
        SkMallocPixelRef* pixels = SkMallocPixelRef::NewWithProc(screenshotInfo,
                (size_t) rowBytes, NULL, (void*) screenshot->getPixels(), &DeleteScreenshot,
                (void*) screenshot);
        pixels->setImmutable();
        bitmap->setPixelRef(pixels)->unref();
        bitmap->lockPixels();
    }

    return GraphicsJNI::createBitmap(env, bitmap,
            GraphicsJNI::kBitmapCreateFlag_Premultiplied, NULL);
}

static void nativeScreenshot(JNIEnv* env, jclass clazz,
        jobject displayTokenObj, jobject surfaceObj,
        jint width, jint height, jint minLayer, jint maxLayer, bool allLayers,
        bool useIdentityTransform) {
    sp<IBinder> displayToken = ibinderForJavaObject(env, displayTokenObj);
    if (displayToken != NULL) {
        sp<Surface> consumer = android_view_Surface_getSurface(env, surfaceObj);
        if (consumer != NULL) {
            if (allLayers) {
                minLayer = 0;
                maxLayer = -1;
            }
            ScreenshotClient::capture(
                    displayToken, consumer->getIGraphicBufferProducer(),
                    width, height, uint32_t(minLayer), uint32_t(maxLayer),
                    useIdentityTransform);
        }
    }
}

static void nativeOpenTransaction(JNIEnv* env, jclass clazz) {
    SurfaceComposerClient::openGlobalTransaction();
}

static void nativeCloseTransaction(JNIEnv* env, jclass clazz) {
    SurfaceComposerClient::closeGlobalTransaction();
}

static void nativeSetAnimationTransaction(JNIEnv* env, jclass clazz) {
    SurfaceComposerClient::setAnimationTransaction();
}

static void nativeSetLayer(JNIEnv* env, jclass clazz, jlong nativeObject, jint zorder) {
    SurfaceControl* const ctrl = reinterpret_cast<SurfaceControl *>(nativeObject);
    status_t err = ctrl->setLayer(zorder);
    if (err < 0 && err != NO_INIT) {
        doThrowIAE(env);
    }
}

static void nativeSetPosition(JNIEnv* env, jclass clazz, jlong nativeObject, jfloat x, jfloat y) {
    SurfaceControl* const ctrl = reinterpret_cast<SurfaceControl *>(nativeObject);
    status_t err = ctrl->setPosition(x, y);
    if (err < 0 && err != NO_INIT) {
        doThrowIAE(env);
    }
}

static void nativeSetSize(JNIEnv* env, jclass clazz, jlong nativeObject, jint w, jint h) {
    SurfaceControl* const ctrl = reinterpret_cast<SurfaceControl *>(nativeObject);
    status_t err = ctrl->setSize(w, h);
    if (err < 0 && err != NO_INIT) {
        doThrowIAE(env);
    }
}

static void nativeSetFlags(JNIEnv* env, jclass clazz, jlong nativeObject, jint flags, jint mask) {
    SurfaceControl* const ctrl = reinterpret_cast<SurfaceControl *>(nativeObject);
    status_t err = ctrl->setFlags(flags, mask);
    if (err < 0 && err != NO_INIT) {
        doThrowIAE(env);
    }
}

static void nativeSetTransparentRegionHint(JNIEnv* env, jclass clazz, jlong nativeObject, jobject regionObj) {
    SurfaceControl* const ctrl = reinterpret_cast<SurfaceControl *>(nativeObject);
    SkRegion* region = android_graphics_Region_getSkRegion(env, regionObj);
    if (!region) {
        doThrowIAE(env);
        return;
    }

    const SkIRect& b(region->getBounds());
    Region reg(Rect(b.fLeft, b.fTop, b.fRight, b.fBottom));
    if (region->isComplex()) {
        SkRegion::Iterator it(*region);
        while (!it.done()) {
            const SkIRect& r(it.rect());
            reg.addRectUnchecked(r.fLeft, r.fTop, r.fRight, r.fBottom);
            it.next();
        }
    }

    status_t err = ctrl->setTransparentRegionHint(reg);
    if (err < 0 && err != NO_INIT) {
        doThrowIAE(env);
    }
}

static void nativeSetAlpha(JNIEnv* env, jclass clazz, jlong nativeObject, jfloat alpha) {
    SurfaceControl* const ctrl = reinterpret_cast<SurfaceControl *>(nativeObject);
    status_t err = ctrl->setAlpha(alpha);
    if (err < 0 && err != NO_INIT) {
        doThrowIAE(env);
    }
}

static void nativeSetMatrix(JNIEnv* env, jclass clazz, jlong nativeObject,
        jfloat dsdx, jfloat dtdx, jfloat dsdy, jfloat dtdy) {
    SurfaceControl* const ctrl = reinterpret_cast<SurfaceControl *>(nativeObject);
    status_t err = ctrl->setMatrix(dsdx, dtdx, dsdy, dtdy);
    if (err < 0 && err != NO_INIT) {
        doThrowIAE(env);
    }
}

static void nativeSetWindowCrop(JNIEnv* env, jclass clazz, jlong nativeObject,
        jint l, jint t, jint r, jint b) {
    SurfaceControl* const ctrl = reinterpret_cast<SurfaceControl *>(nativeObject);
    Rect crop(l, t, r, b);
    status_t err = ctrl->setCrop(crop);
    if (err < 0 && err != NO_INIT) {
        doThrowIAE(env);
    }
}

static void nativeSetLayerStack(JNIEnv* env, jclass clazz, jlong nativeObject, jint layerStack) {
    SurfaceControl* const ctrl = reinterpret_cast<SurfaceControl *>(nativeObject);
    status_t err = ctrl->setLayerStack(layerStack);
    if (err < 0 && err != NO_INIT) {
        doThrowIAE(env);
    }
}

static jobject nativeGetBuiltInDisplay(JNIEnv* env, jclass clazz, jint id) {
    sp<IBinder> token(SurfaceComposerClient::getBuiltInDisplay(id));
    return javaObjectForIBinder(env, token);
}

static jobject nativeCreateDisplay(JNIEnv* env, jclass clazz, jstring nameObj,
        jboolean secure) {
    ScopedUtfChars name(env, nameObj);
    sp<IBinder> token(SurfaceComposerClient::createDisplay(
            String8(name.c_str()), bool(secure)));
    return javaObjectForIBinder(env, token);
}

static void nativeDestroyDisplay(JNIEnv* env, jclass clazz, jobject tokenObj) {
    sp<IBinder> token(ibinderForJavaObject(env, tokenObj));
    if (token == NULL) return;
    SurfaceComposerClient::destroyDisplay(token);
}

static void nativeSetDisplaySurface(JNIEnv* env, jclass clazz,
        jobject tokenObj, jlong nativeSurfaceObject) {
    sp<IBinder> token(ibinderForJavaObject(env, tokenObj));
    if (token == NULL) return;
    sp<IGraphicBufferProducer> bufferProducer;
    sp<Surface> sur(reinterpret_cast<Surface *>(nativeSurfaceObject));
    if (sur != NULL) {
        bufferProducer = sur->getIGraphicBufferProducer();
    }
    SurfaceComposerClient::setDisplaySurface(token, bufferProducer);
}

static void nativeSetDisplayLayerStack(JNIEnv* env, jclass clazz,
        jobject tokenObj, jint layerStack) {
    sp<IBinder> token(ibinderForJavaObject(env, tokenObj));
    if (token == NULL) return;

    SurfaceComposerClient::setDisplayLayerStack(token, layerStack);
}

static void nativeSetDisplayProjection(JNIEnv* env, jclass clazz,
        jobject tokenObj, jint orientation,
        jint layerStackRect_left, jint layerStackRect_top, jint layerStackRect_right, jint layerStackRect_bottom,
        jint displayRect_left, jint displayRect_top, jint displayRect_right, jint displayRect_bottom) {
    sp<IBinder> token(ibinderForJavaObject(env, tokenObj));
    if (token == NULL) return;
    Rect layerStackRect(layerStackRect_left, layerStackRect_top, layerStackRect_right, layerStackRect_bottom);
    Rect displayRect(displayRect_left, displayRect_top, displayRect_right, displayRect_bottom);
    SurfaceComposerClient::setDisplayProjection(token, orientation, layerStackRect, displayRect);
}

static jboolean nativeGetDisplayInfo(JNIEnv* env, jclass clazz,
        jobject tokenObj, jobject infoObj) {
    sp<IBinder> token(ibinderForJavaObject(env, tokenObj));
    if (token == NULL) return JNI_FALSE;

    DisplayInfo info;
    if (SurfaceComposerClient::getDisplayInfo(token, &info)) {
        return JNI_FALSE;
    }

    env->SetIntField(infoObj, gPhysicalDisplayInfoClassInfo.width, info.w);
    env->SetIntField(infoObj, gPhysicalDisplayInfoClassInfo.height, info.h);
    env->SetFloatField(infoObj, gPhysicalDisplayInfoClassInfo.refreshRate, info.fps);
    env->SetFloatField(infoObj, gPhysicalDisplayInfoClassInfo.density, info.density);
    env->SetFloatField(infoObj, gPhysicalDisplayInfoClassInfo.xDpi, info.xdpi);
    env->SetFloatField(infoObj, gPhysicalDisplayInfoClassInfo.yDpi, info.ydpi);
    env->SetBooleanField(infoObj, gPhysicalDisplayInfoClassInfo.secure, info.secure);
    return JNI_TRUE;
}

static void nativeBlankDisplay(JNIEnv* env, jclass clazz, jobject tokenObj) {
    sp<IBinder> token(ibinderForJavaObject(env, tokenObj));
    if (token == NULL) return;

    ALOGD_IF_SLOW(100, "Excessive delay in blankDisplay() while turning screen off");
    SurfaceComposerClient::blankDisplay(token);
}

static void nativeUnblankDisplay(JNIEnv* env, jclass clazz, jobject tokenObj) {
    sp<IBinder> token(ibinderForJavaObject(env, tokenObj));
    if (token == NULL) return;

    ALOGD_IF_SLOW(100, "Excessive delay in unblankDisplay() while turning screen on");
    SurfaceComposerClient::unblankDisplay(token);
}

static jboolean nativeClearContentFrameStats(JNIEnv* env, jclass clazz, jlong nativeObject) {
    SurfaceControl* const ctrl = reinterpret_cast<SurfaceControl *>(nativeObject);
    status_t err = ctrl->clearLayerFrameStats();

    if (err < 0 && err != NO_INIT) {
        doThrowIAE(env);
    }

    // The other end is not ready, just report we failed.
    if (err == NO_INIT) {
        return JNI_FALSE;
    }

    return JNI_TRUE;
}

static jboolean nativeGetContentFrameStats(JNIEnv* env, jclass clazz, jlong nativeObject,
    jobject outStats) {
    FrameStats stats;

    SurfaceControl* const ctrl = reinterpret_cast<SurfaceControl *>(nativeObject);
    status_t err = ctrl->getLayerFrameStats(&stats);
    if (err < 0 && err != NO_INIT) {
        doThrowIAE(env);
    }

    // The other end is not ready, fine just return empty stats.
    if (err == NO_INIT) {
        return JNI_FALSE;
    }

    jlong refreshPeriodNano = static_cast<jlong>(stats.refreshPeriodNano);
    size_t frameCount = stats.desiredPresentTimesNano.size();

    jlongArray postedTimesNanoDst = env->NewLongArray(frameCount);
    if (postedTimesNanoDst == NULL) {
        return JNI_FALSE;
    }

    jlongArray presentedTimesNanoDst = env->NewLongArray(frameCount);
    if (presentedTimesNanoDst == NULL) {
        return JNI_FALSE;
    }

    jlongArray readyTimesNanoDst = env->NewLongArray(frameCount);
    if (readyTimesNanoDst == NULL) {
        return JNI_FALSE;
    }

    nsecs_t postedTimesNanoSrc[frameCount];
    nsecs_t presentedTimesNanoSrc[frameCount];
    nsecs_t readyTimesNanoSrc[frameCount];

    for (size_t i = 0; i < frameCount; i++) {
        nsecs_t postedTimeNano = stats.desiredPresentTimesNano[i];
        if (postedTimeNano == INT64_MAX) {
            postedTimeNano = gWindowContentFrameStatsClassInfo.UNDEFINED_TIME_NANO;
        }
        postedTimesNanoSrc[i] = postedTimeNano;

        nsecs_t presentedTimeNano = stats.actualPresentTimesNano[i];
        if (presentedTimeNano == INT64_MAX) {
            presentedTimeNano = gWindowContentFrameStatsClassInfo.UNDEFINED_TIME_NANO;
        }
        presentedTimesNanoSrc[i] = presentedTimeNano;

        nsecs_t readyTimeNano = stats.frameReadyTimesNano[i];
        if (readyTimeNano == INT64_MAX) {
            readyTimeNano = gWindowContentFrameStatsClassInfo.UNDEFINED_TIME_NANO;
        }
        readyTimesNanoSrc[i] = readyTimeNano;
    }

    env->SetLongArrayRegion(postedTimesNanoDst, 0, frameCount, postedTimesNanoSrc);
    env->SetLongArrayRegion(presentedTimesNanoDst, 0, frameCount, presentedTimesNanoSrc);
    env->SetLongArrayRegion(readyTimesNanoDst, 0, frameCount, readyTimesNanoSrc);

    env->CallVoidMethod(outStats, gWindowContentFrameStatsClassInfo.init, refreshPeriodNano,
            postedTimesNanoDst, presentedTimesNanoDst, readyTimesNanoDst);

    if (env->ExceptionCheck()) {
        return JNI_FALSE;
    }

    return JNI_TRUE;
}

static jboolean nativeClearAnimationFrameStats(JNIEnv* env, jclass clazz) {
    status_t err = SurfaceComposerClient::clearAnimationFrameStats();

    if (err < 0 && err != NO_INIT) {
        doThrowIAE(env);
    }

    // The other end is not ready, just report we failed.
    if (err == NO_INIT) {
        return JNI_FALSE;
    }

    return JNI_TRUE;
}

static jboolean nativeGetAnimationFrameStats(JNIEnv* env, jclass clazz, jobject outStats) {
    FrameStats stats;

    status_t err = SurfaceComposerClient::getAnimationFrameStats(&stats);
    if (err < 0 && err != NO_INIT) {
        doThrowIAE(env);
    }

    // The other end is not ready, fine just return empty stats.
    if (err == NO_INIT) {
        return JNI_FALSE;
    }

    jlong refreshPeriodNano = static_cast<jlong>(stats.refreshPeriodNano);
    size_t frameCount = stats.desiredPresentTimesNano.size();

    jlongArray presentedTimesNanoDst = env->NewLongArray(frameCount);
    if (presentedTimesNanoDst == NULL) {
        return JNI_FALSE;
    }

    nsecs_t presentedTimesNanoSrc[frameCount];

    for (size_t i = 0; i < frameCount; i++) {
        nsecs_t presentedTimeNano = stats.desiredPresentTimesNano[i];
        if (presentedTimeNano == INT64_MAX) {
            presentedTimeNano = gWindowContentFrameStatsClassInfo.UNDEFINED_TIME_NANO;
        }
        presentedTimesNanoSrc[i] = presentedTimeNano;
    }

    env->SetLongArrayRegion(presentedTimesNanoDst, 0, frameCount, presentedTimesNanoSrc);

    env->CallVoidMethod(outStats, gWindowAnimationFrameStatsClassInfo.init, refreshPeriodNano,
            presentedTimesNanoDst);

    if (env->ExceptionCheck()) {
        return JNI_FALSE;
    }

    return JNI_TRUE;
}

// ----------------------------------------------------------------------------

static JNINativeMethod sSurfaceControlMethods[] = {
    {"nativeCreate", "(Landroid/view/SurfaceSession;Ljava/lang/String;IIII)J",
            (void*)nativeCreate },
    {"nativeRelease", "(J)V",
            (void*)nativeRelease },
    {"nativeDestroy", "(J)V",
            (void*)nativeDestroy },
    {"nativeScreenshot", "(Landroid/os/IBinder;IIIIZZ)Landroid/graphics/Bitmap;",
            (void*)nativeScreenshotBitmap },
    {"nativeScreenshot", "(Landroid/os/IBinder;Landroid/view/Surface;IIIIZZ)V",
            (void*)nativeScreenshot },
    {"nativeOpenTransaction", "()V",
            (void*)nativeOpenTransaction },
    {"nativeCloseTransaction", "()V",
            (void*)nativeCloseTransaction },
    {"nativeSetAnimationTransaction", "()V",
            (void*)nativeSetAnimationTransaction },
    {"nativeSetLayer", "(JI)V",
            (void*)nativeSetLayer },
    {"nativeSetPosition", "(JFF)V",
            (void*)nativeSetPosition },
    {"nativeSetSize", "(JII)V",
            (void*)nativeSetSize },
    {"nativeSetTransparentRegionHint", "(JLandroid/graphics/Region;)V",
            (void*)nativeSetTransparentRegionHint },
    {"nativeSetAlpha", "(JF)V",
            (void*)nativeSetAlpha },
    {"nativeSetMatrix", "(JFFFF)V",
            (void*)nativeSetMatrix },
    {"nativeSetFlags", "(JII)V",
            (void*)nativeSetFlags },
    {"nativeSetWindowCrop", "(JIIII)V",
            (void*)nativeSetWindowCrop },
    {"nativeSetLayerStack", "(JI)V",
            (void*)nativeSetLayerStack },
    {"nativeGetBuiltInDisplay", "(I)Landroid/os/IBinder;",
            (void*)nativeGetBuiltInDisplay },
    {"nativeCreateDisplay", "(Ljava/lang/String;Z)Landroid/os/IBinder;",
            (void*)nativeCreateDisplay },
    {"nativeDestroyDisplay", "(Landroid/os/IBinder;)V",
            (void*)nativeDestroyDisplay },
    {"nativeSetDisplaySurface", "(Landroid/os/IBinder;J)V",
            (void*)nativeSetDisplaySurface },
    {"nativeSetDisplayLayerStack", "(Landroid/os/IBinder;I)V",
            (void*)nativeSetDisplayLayerStack },
    {"nativeSetDisplayProjection", "(Landroid/os/IBinder;IIIIIIIII)V",
            (void*)nativeSetDisplayProjection },
    {"nativeGetDisplayInfo", "(Landroid/os/IBinder;Landroid/view/SurfaceControl$PhysicalDisplayInfo;)Z",
            (void*)nativeGetDisplayInfo },
    {"nativeBlankDisplay", "(Landroid/os/IBinder;)V",
            (void*)nativeBlankDisplay },
    {"nativeUnblankDisplay", "(Landroid/os/IBinder;)V",
            (void*)nativeUnblankDisplay },
    {"nativeClearContentFrameStats", "(J)Z",
            (void*)nativeClearContentFrameStats },
    {"nativeGetContentFrameStats", "(JLandroid/view/WindowContentFrameStats;)Z",
            (void*)nativeGetContentFrameStats },
    {"nativeClearAnimationFrameStats", "()Z",
            (void*)nativeClearAnimationFrameStats },
    {"nativeGetAnimationFrameStats", "(Landroid/view/WindowAnimationFrameStats;)Z",
            (void*)nativeGetAnimationFrameStats },
};

int register_android_view_SurfaceControl(JNIEnv* env)
{
    int err = AndroidRuntime::registerNativeMethods(env, "android/view/SurfaceControl",
            sSurfaceControlMethods, NELEM(sSurfaceControlMethods));

    jclass clazz = env->FindClass("android/view/SurfaceControl$PhysicalDisplayInfo");
    gPhysicalDisplayInfoClassInfo.width = env->GetFieldID(clazz, "width", "I");
    gPhysicalDisplayInfoClassInfo.height = env->GetFieldID(clazz, "height", "I");
    gPhysicalDisplayInfoClassInfo.refreshRate = env->GetFieldID(clazz, "refreshRate", "F");
    gPhysicalDisplayInfoClassInfo.density = env->GetFieldID(clazz, "density", "F");
    gPhysicalDisplayInfoClassInfo.xDpi = env->GetFieldID(clazz, "xDpi", "F");
    gPhysicalDisplayInfoClassInfo.yDpi = env->GetFieldID(clazz, "yDpi", "F");
    gPhysicalDisplayInfoClassInfo.secure = env->GetFieldID(clazz, "secure", "Z");

    jclass frameStatsClazz = env->FindClass("android/view/FrameStats");
    jfieldID undefined_time_nano_field =  env->GetStaticFieldID(frameStatsClazz, "UNDEFINED_TIME_NANO", "J");
    nsecs_t undefined_time_nano = env->GetStaticLongField(frameStatsClazz, undefined_time_nano_field);

    jclass contFrameStatsClazz = env->FindClass("android/view/WindowContentFrameStats");
    gWindowContentFrameStatsClassInfo.init =  env->GetMethodID(contFrameStatsClazz, "init", "(J[J[J[J)V");
    gWindowContentFrameStatsClassInfo.UNDEFINED_TIME_NANO = undefined_time_nano;

    jclass animFrameStatsClazz = env->FindClass("android/view/WindowAnimationFrameStats");
    gWindowAnimationFrameStatsClassInfo.init =  env->GetMethodID(animFrameStatsClazz, "init", "(J[J)V");
    gWindowAnimationFrameStatsClassInfo.UNDEFINED_TIME_NANO = undefined_time_nano;

    return err;
}

};