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path: root/libs/gui/SurfaceTextureClient.cpp
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/*
 * Copyright (C) 2010 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 "SurfaceTextureClient"
//#define LOG_NDEBUG 0

#include <gui/SurfaceTextureClient.h>
#include <surfaceflinger/ISurfaceComposer.h>
#include <surfaceflinger/SurfaceComposerClient.h>

#include <utils/Log.h>
#include <qcom_ui.h>

#include <testframework/TestFramework.h>
#include <utils/KeyedVector.h>

namespace android {

static KeyedVector<const SurfaceTextureClient*, int> sBufferSizeSet;
static KeyedVector<const SurfaceTextureClient*, int> sBufferTransform;
static KeyedVector<const SurfaceTextureClient*, int> sQueueBufferStatus;

#ifdef GFX_TESTFRAMEWORK
    //holds time stats for dequeue, lock, queue operations on buffers
    static nsecs_t sDequeueStartTime[SurfaceTexture::NUM_BUFFER_SLOTS];
    static nsecs_t sDequeueEndTime[SurfaceTexture::NUM_BUFFER_SLOTS];
    static nsecs_t sLockStartTime[SurfaceTexture::NUM_BUFFER_SLOTS];
    static nsecs_t sQueueStartTime[SurfaceTexture::NUM_BUFFER_SLOTS];
    static nsecs_t sQueueEndTime[SurfaceTexture::NUM_BUFFER_SLOTS];
#endif

SurfaceTextureClient::SurfaceTextureClient(
        const sp<ISurfaceTexture>& surfaceTexture)
{
    SurfaceTextureClient::init();
    SurfaceTextureClient::setISurfaceTexture(surfaceTexture);
}

SurfaceTextureClient::SurfaceTextureClient() {
    SurfaceTextureClient::init();
}

SurfaceTextureClient::~SurfaceTextureClient() {
    if (mConnectedToCpu) {
        SurfaceTextureClient::disconnect(NATIVE_WINDOW_API_CPU);
    }
    sBufferSizeSet.removeItem(this);
    sBufferTransform.removeItem(this);
    sQueueBufferStatus.removeItem(this);
}

void SurfaceTextureClient::init() {
    // Initialize the ANativeWindow function pointers.
    ANativeWindow::setSwapInterval  = hook_setSwapInterval;
    ANativeWindow::dequeueBuffer    = hook_dequeueBuffer;
    ANativeWindow::cancelBuffer     = hook_cancelBuffer;
    ANativeWindow::lockBuffer       = hook_lockBuffer;
    ANativeWindow::queueBuffer      = hook_queueBuffer;
    ANativeWindow::query            = hook_query;
    ANativeWindow::perform          = hook_perform;

    const_cast<int&>(ANativeWindow::minSwapInterval) = 0;
    const_cast<int&>(ANativeWindow::maxSwapInterval) = 1;
    sBufferSizeSet.add(this, 0);
    sBufferTransform.add(this, 0);
    sQueueBufferStatus.add(this, 0);

    mReqWidth = 0;
    mReqHeight = 0;
    mReqFormat = 0;
    mReqUsage = 0;
    mTimestamp = NATIVE_WINDOW_TIMESTAMP_AUTO;
    mDefaultWidth = 0;
    mDefaultHeight = 0;
    mTransformHint = 0;
    mConnectedToCpu = false;
}

void SurfaceTextureClient::setISurfaceTexture(
        const sp<ISurfaceTexture>& surfaceTexture)
{
    mSurfaceTexture = surfaceTexture;
}

sp<ISurfaceTexture> SurfaceTextureClient::getISurfaceTexture() const {
    return mSurfaceTexture;
}

int SurfaceTextureClient::hook_setSwapInterval(ANativeWindow* window, int interval) {
    SurfaceTextureClient* c = getSelf(window);
    return c->setSwapInterval(interval);
}

int SurfaceTextureClient::hook_dequeueBuffer(ANativeWindow* window,
        ANativeWindowBuffer** buffer) {
    SurfaceTextureClient* c = getSelf(window);
    return c->dequeueBuffer(buffer);
}

int SurfaceTextureClient::hook_cancelBuffer(ANativeWindow* window,
        ANativeWindowBuffer* buffer) {
    SurfaceTextureClient* c = getSelf(window);
    return c->cancelBuffer(buffer);
}

int SurfaceTextureClient::hook_lockBuffer(ANativeWindow* window,
        ANativeWindowBuffer* buffer) {
    SurfaceTextureClient* c = getSelf(window);
    return c->lockBuffer(buffer);
}

int SurfaceTextureClient::hook_queueBuffer(ANativeWindow* window,
        ANativeWindowBuffer* buffer) {
    SurfaceTextureClient* c = getSelf(window);
    return c->queueBuffer(buffer);
}

int SurfaceTextureClient::hook_query(const ANativeWindow* window,
                                int what, int* value) {
    SurfaceTextureClient* c = (SurfaceTextureClient*)getSelf(window);
    return c->query(what, value);
}

int SurfaceTextureClient::hook_perform(ANativeWindow* window, int operation, ...) {
    va_list args;
    va_start(args, operation);
    SurfaceTextureClient* c = getSelf(window);
    return c->perform(operation, args);
}

int SurfaceTextureClient::setSwapInterval(int interval) {
    // EGL specification states:
    //  interval is silently clamped to minimum and maximum implementation
    //  dependent values before being stored.
    // Although we don't have to, we apply the same logic here.

    if (interval < minSwapInterval)
        interval = minSwapInterval;

    if (interval > maxSwapInterval)
        interval = maxSwapInterval;

    status_t res = mSurfaceTexture->setSynchronousMode(interval ? true : false);

    return res;
}

int SurfaceTextureClient::dequeueBuffer(android_native_buffer_t** buffer) {
    LOGV("SurfaceTextureClient::dequeueBuffer");
#ifdef GFX_TESTFRAMEWORK
    nsecs_t startTime = systemTime();
    TF_PRINT(TF_EVENT_START, "STClient", "DQ", "BUFFER:STC dequeue start");
#endif
    Mutex::Autolock lock(mMutex);
    int buf = -1;
    status_t result = mSurfaceTexture->dequeueBuffer(&buf, mReqWidth, mReqHeight,
            mReqFormat, mReqUsage);
    if (result < 0) {
        LOGV("dequeueBuffer: ISurfaceTexture::dequeueBuffer(%d, %d, %d, %d)"
             "failed: %d", mReqWidth, mReqHeight, mReqFormat, mReqUsage,
             result);
        return result;
    }
    sp<GraphicBuffer>& gbuf(mSlots[buf]);
    if (result & ISurfaceTexture::RELEASE_ALL_BUFFERS) {
        freeAllBuffers();
    }

    if ((result & ISurfaceTexture::BUFFER_NEEDS_REALLOCATION) || gbuf == 0) {
        result = mSurfaceTexture->requestBuffer(buf, &gbuf);
        if (result != NO_ERROR) {
            LOGE("dequeueBuffer: ISurfaceTexture::requestBuffer failed: %d",
                    result);
            return result;
        }
    }
    *buffer = gbuf.get();
#ifdef GFX_TESTFRAMEWORK
    sDequeueEndTime[buf] = systemTime();
    sDequeueStartTime[buf] = startTime;
    TF_PRINT(TF_EVENT_STOP, "STClient", "DQ",
             "BUFFER:STC dequeue end bufSlot=%d buffer=%p",
             buf, mSlots[buf]->handle);
#endif
    // Set the value, since the buffer has been dequeued.
    ssize_t index = sQueueBufferStatus.indexOfKey(this);
    sQueueBufferStatus.replaceValueAt(index, 1);

    return OK;
}

int SurfaceTextureClient::cancelBuffer(android_native_buffer_t* buffer) {
    LOGV("SurfaceTextureClient::cancelBuffer");
    Mutex::Autolock lock(mMutex);
    int i = getSlotFromBufferLocked(buffer);
    if (i < 0) {
        return i;
    }
    mSurfaceTexture->cancelBuffer(i);
    // Reset the value, since the buffer has been cancelled.
    ssize_t index = sQueueBufferStatus.indexOfKey(this);
    sQueueBufferStatus.replaceValueAt(index, 0);

    return OK;
}

int SurfaceTextureClient::getSlotFromBufferLocked(
        android_native_buffer_t* buffer) const {

    if (buffer == NULL) {
        LOGE("getSlotFromBufferLocked: encountered NULL buffer");
        return BAD_VALUE;
    }

    bool dumpedState = false;
    for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
        // XXX: Dump the slots whenever we hit a NULL entry while searching for
        // a buffer.
        if (mSlots[i] == NULL) {
            if (!dumpedState) {
                LOGD("getSlotFromBufferLocked: encountered NULL buffer in slot %d "
                        "looking for buffer %p", i, buffer->handle);
                for (int j = 0; j < NUM_BUFFER_SLOTS; j++) {
                    if (mSlots[j] == NULL) {
                        LOGD("getSlotFromBufferLocked:   %02d: NULL", j);
                    } else {
                        LOGD("getSlotFromBufferLocked:   %02d: %p", j, mSlots[j]->handle);
                    }
                }
                dumpedState = true;
            }
        }

        if (mSlots[i] != NULL && mSlots[i]->handle == buffer->handle) {
            return i;
        }
    }
    LOGE("getSlotFromBufferLocked: unknown buffer: %p", buffer->handle);
    return BAD_VALUE;
}

int SurfaceTextureClient::lockBuffer(android_native_buffer_t* buffer) {
    LOGV("SurfaceTextureClient::lockBuffer");
#ifdef GFX_TESTFRAMEWORK
    int i = getSlotFromBufferLocked(buffer);
    char eventID[TF_EVENT_ID_SIZE_MAX];
    snprintf(eventID, TF_EVENT_ID_SIZE_MAX, "Lock-%d", i);
    TF_PRINT(TF_EVENT, "STClient", eventID, "BUFFER:STC lock, buffer=%p",
             mSlots[i]->handle);
    sLockStartTime[i] = systemTime();
#endif
    Mutex::Autolock lock(mMutex);
    return OK;
}

int SurfaceTextureClient::queueBuffer(android_native_buffer_t* buffer) {
    LOGV("SurfaceTextureClient::queueBuffer");
#ifdef GFX_TESTFRAMEWORK
    char eventID[TF_EVENT_ID_SIZE_MAX];
    int idx = getSlotFromBufferLocked(buffer);
    snprintf(eventID, TF_EVENT_ID_SIZE_MAX, "Q-%d", idx);
    TF_PRINT(TF_EVENT_START, "STClient", eventID, "BUFFER:STC queue start");
    sQueueStartTime[idx] = systemTime();
#endif
    Mutex::Autolock lock(mMutex);
    int64_t timestamp;
    if (mTimestamp == NATIVE_WINDOW_TIMESTAMP_AUTO) {
        timestamp = systemTime(SYSTEM_TIME_MONOTONIC);
        LOGV("SurfaceTextureClient::queueBuffer making up timestamp: %.2f ms",
             timestamp / 1000000.f);
    } else {
        timestamp = mTimestamp;
    }
    int i = getSlotFromBufferLocked(buffer);
    if (i < 0) {
        return i;
    }
    uint32_t currentTransform = sBufferTransform.valueFor(this);

    status_t err = mSurfaceTexture->queueBuffer(i, timestamp,
            &mDefaultWidth, &mDefaultHeight, &currentTransform);
    if (err != OK)  {
        LOGE("queueBuffer: error queuing buffer to SurfaceTexture, %d", err);
    }
    mTransformHint = currentTransform;
#ifdef GFX_TESTFRAMEWORK
    sQueueEndTime[i] = systemTime();
    TF_PRINT(TF_EVENT_STOP, "STClient", eventID, "BUFFER:STC queue end, buffer=%p",
             mSlots[i]->handle);
    {
        int dqTime = ns2ms(sDequeueEndTime[i] - sDequeueStartTime[i]);
        int dqToLock = ns2ms(sLockStartTime[i] - sDequeueEndTime[i]);
        int qTime = ns2ms(sQueueEndTime[i] - sQueueStartTime[i]);
        int renderingTime = ns2ms(sQueueStartTime[i] - sLockStartTime[i]);
        int totalTime = ns2ms(sQueueEndTime[i] - sDequeueStartTime[i]);
        TF_PRINT(TF_EVENT, "STClient", "GFX-Timelines", "DequeueTime %d LockTime Unk QueueTime %d "
                 "RenderingTime %d DequeueToLockTime %d TotalTime %d bufSlot %d PID %d TID %d",
                 dqTime, qTime, renderingTime, dqToLock, totalTime,
                 i, getpid(), gettid());
    }
#endif
    // Reset the value, since the buffer has been queued.
    ssize_t index = sQueueBufferStatus.indexOfKey(this);
    sQueueBufferStatus.replaceValueAt(index, 0);

    return err;
}

int SurfaceTextureClient::query(int what, int* value) const {
    LOGV("SurfaceTextureClient::query");
    { // scope for the lock
        Mutex::Autolock lock(mMutex);
        switch (what) {
            case NATIVE_WINDOW_FORMAT:
                if (mReqFormat) {
                    *value = mReqFormat;
                    return NO_ERROR;
                }
                break;
            case NATIVE_WINDOW_QUEUES_TO_WINDOW_COMPOSER:
                {
                    sp<ISurfaceComposer> composer(
                            ComposerService::getComposerService());
                    if (composer->authenticateSurfaceTexture(mSurfaceTexture)) {
                        *value = 1;
                    } else {
                        *value = 0;
                    }
                }
                return NO_ERROR;
            case NATIVE_WINDOW_CONCRETE_TYPE:
                *value = NATIVE_WINDOW_SURFACE_TEXTURE_CLIENT;
                return NO_ERROR;
            case NATIVE_WINDOW_DEFAULT_WIDTH:
                *value = mDefaultWidth;
                return NO_ERROR;
            case NATIVE_WINDOW_DEFAULT_HEIGHT:
                *value = mDefaultHeight;
                return NO_ERROR;
            case NATIVE_WINDOW_TRANSFORM_HINT:
            {
                int queueStatus = sQueueBufferStatus.valueFor(this);
                // Check the queue status. If the value is 0, we have
                // already done a queue and the local variable is up to
                // date. Use the local value. (set the variable during
                // dequeue and reset it on queue)
                if (queueStatus == 0) {
                    *value = mTransformHint;
                    return NO_ERROR;
                }
                return mSurfaceTexture->query(what, value);
            }
            default:
                if (NATIVE_WINDOW_SET_BUFFERS_SIZE == what) {
                   ssize_t index = sBufferSizeSet.indexOfKey(this);
                   sBufferSizeSet.replaceValueAt(index, 1);
                }
        }
    }
    return mSurfaceTexture->query(what, value);
}

int SurfaceTextureClient::perform(int operation, va_list args)
{
    int res = NO_ERROR;
    switch (operation) {
    case NATIVE_WINDOW_CONNECT:
        // deprecated. must return NO_ERROR.
        break;
    case NATIVE_WINDOW_DISCONNECT:
        // deprecated. must return NO_ERROR.
        break;
    case NATIVE_WINDOW_SET_USAGE:
        res = dispatchSetUsage(args);
        break;
    case NATIVE_WINDOW_SET_CROP:
        res = dispatchSetCrop(args);
        break;
    case NATIVE_WINDOW_SET_BUFFER_COUNT:
        res = dispatchSetBufferCount(args);
        break;
    case NATIVE_WINDOW_SET_BUFFERS_GEOMETRY:
        res = dispatchSetBuffersGeometry(args);
        break;
    case NATIVE_WINDOW_SET_BUFFERS_TRANSFORM:
        res = dispatchSetBuffersTransform(args);
        break;
    case NATIVE_WINDOW_SET_BUFFERS_TIMESTAMP:
        res = dispatchSetBuffersTimestamp(args);
        break;
    case NATIVE_WINDOW_SET_BUFFERS_DIMENSIONS:
        res = dispatchSetBuffersDimensions(args);
        break;
    case NATIVE_WINDOW_SET_BUFFERS_FORMAT:
        res = dispatchSetBuffersFormat(args);
        break;
    case NATIVE_WINDOW_LOCK:
        res = dispatchLock(args);
        break;
    case NATIVE_WINDOW_UNLOCK_AND_POST:
        res = dispatchUnlockAndPost(args);
        break;
    case NATIVE_WINDOW_SET_SCALING_MODE:
        res = dispatchSetScalingMode(args);
        break;
    case NATIVE_WINDOW_API_CONNECT:
        res = dispatchConnect(args);
        break;
    case NATIVE_WINDOW_API_DISCONNECT:
        res = dispatchDisconnect(args);
        break;
    default:
        res = dispatchPerformQcomOperation(operation, args);
        break;
    }
    return res;
}

int SurfaceTextureClient::dispatchPerformQcomOperation(int operation,
                                                       va_list args) {
    int num_args = getNumberOfArgsForOperation(operation);
    if (-EINVAL == num_args) {
        LOGE("%s: invalid arguments for operation (operation = 0x%x)",
             __FUNCTION__, operation);
        return -1;
    }

    LOGV("%s: num_args = %d", __FUNCTION__, num_args);
    int arg[3] = {0, 0, 0};
    for (int i =0; i < num_args; i++) {
        arg[i] = va_arg(args, int);
    }
    return performQcomOperation(operation, arg[0], arg[1], arg[2]);
}

int SurfaceTextureClient::dispatchConnect(va_list args) {
    int api = va_arg(args, int);
    return connect(api);
}

int SurfaceTextureClient::dispatchDisconnect(va_list args) {
    int api = va_arg(args, int);
    return disconnect(api);
}

int SurfaceTextureClient::dispatchSetUsage(va_list args) {
    int usage = va_arg(args, int);
    return setUsage(usage);
}

int SurfaceTextureClient::dispatchSetCrop(va_list args) {
    android_native_rect_t const* rect = va_arg(args, android_native_rect_t*);
    return setCrop(reinterpret_cast<Rect const*>(rect));
}

int SurfaceTextureClient::dispatchSetBufferCount(va_list args) {
    size_t bufferCount = va_arg(args, size_t);
    return setBufferCount(bufferCount);
}

int SurfaceTextureClient::dispatchSetBuffersGeometry(va_list args) {
    int w = va_arg(args, int);
    int h = va_arg(args, int);
    int f = va_arg(args, int);
    int err = setBuffersDimensions(w, h);
    if (err != 0) {
        return err;
    }
    // Do the extra IPC only if the buffer size was set before
    int isBufferSizeSet = sBufferSizeSet.valueFor(this);
    if (isBufferSizeSet) {
        LOGV("Resetting the Buffer size to 0 after SET GEOMETRY");
        err = performQcomOperation(NATIVE_WINDOW_SET_BUFFERS_SIZE, 0, 0, 0);
        ssize_t index = sBufferSizeSet.indexOfKey(this);
        sBufferSizeSet.replaceValueAt(index, 0);
    }
    if (err != 0) {
        return err;
    }
    return setBuffersFormat(f);
}

int SurfaceTextureClient::dispatchSetBuffersDimensions(va_list args) {
    int w = va_arg(args, int);
    int h = va_arg(args, int);
    int err = setBuffersDimensions(w, h);
    if (err != 0) {
        return err;
    }
    int isBufferSizeSet = sBufferSizeSet.valueFor(this);
    if (isBufferSizeSet) {
        LOGV("Resetting the Buffer size to 0 after SET DIMENSIONS");
        err = performQcomOperation(NATIVE_WINDOW_SET_BUFFERS_SIZE, 0, 0, 0);
        ssize_t index = sBufferSizeSet.indexOfKey(this);
        sBufferSizeSet.replaceValueAt(index, 0);
    }
    return err;
}

int SurfaceTextureClient::dispatchSetBuffersFormat(va_list args) {
    int f = va_arg(args, int);
    return setBuffersFormat(f);
}

int SurfaceTextureClient::dispatchSetScalingMode(va_list args) {
    int m = va_arg(args, int);
    return setScalingMode(m);
}

int SurfaceTextureClient::dispatchSetBuffersTransform(va_list args) {
    int transform = va_arg(args, int);
    return setBuffersTransform(transform);
}

int SurfaceTextureClient::dispatchSetBuffersTimestamp(va_list args) {
    int64_t timestamp = va_arg(args, int64_t);
    return setBuffersTimestamp(timestamp);
}

int SurfaceTextureClient::dispatchLock(va_list args) {
    ANativeWindow_Buffer* outBuffer = va_arg(args, ANativeWindow_Buffer*);
    ARect* inOutDirtyBounds = va_arg(args, ARect*);
    return lock(outBuffer, inOutDirtyBounds);
}

int SurfaceTextureClient::dispatchUnlockAndPost(va_list args) {
    return unlockAndPost();
}

int SurfaceTextureClient::performQcomOperation(int operation, int arg1,
                                               int arg2, int arg3) {
    LOGV("SurfaceTextureClient::performQcomOperation");
    Mutex::Autolock lock(mMutex);
    int err = mSurfaceTexture->performQcomOperation(operation, arg1, arg2, arg3);
    return err;
}

int SurfaceTextureClient::connect(int api) {
    LOGV("SurfaceTextureClient::connect");
    Mutex::Autolock lock(mMutex);
    int err = mSurfaceTexture->connect(api,
            &mDefaultWidth, &mDefaultHeight, &mTransformHint);
    if (!err && api == NATIVE_WINDOW_API_CPU) {
        mConnectedToCpu = true;
    }
    return err;
}

int SurfaceTextureClient::disconnect(int api) {
    LOGV("SurfaceTextureClient::disconnect");
    Mutex::Autolock lock(mMutex);
    freeAllBuffers();
    int err = mSurfaceTexture->disconnect(api);
    if (!err) {
        mReqFormat = 0;
        mReqWidth = 0;
        mReqHeight = 0;
        mReqUsage = 0;
        if (api == NATIVE_WINDOW_API_CPU) {
            mConnectedToCpu = false;
        }
    }
    return err;
}

int SurfaceTextureClient::setUsage(uint32_t reqUsage)
{
    LOGV("SurfaceTextureClient::setUsage");
    Mutex::Autolock lock(mMutex);
    mReqUsage = reqUsage;
    return OK;
}

int SurfaceTextureClient::setCrop(Rect const* rect)
{
    LOGV("SurfaceTextureClient::setCrop");
    Mutex::Autolock lock(mMutex);

    Rect realRect;
    if (rect == NULL || rect->isEmpty()) {
        realRect = Rect(0, 0);
    } else {
        realRect = *rect;
    }

    status_t err = mSurfaceTexture->setCrop(*rect);
    LOGE_IF(err, "ISurfaceTexture::setCrop(...) returned %s", strerror(-err));

    return err;
}

int SurfaceTextureClient::setBufferCount(int bufferCount)
{
    LOGV("SurfaceTextureClient::setBufferCount");
    Mutex::Autolock lock(mMutex);

    status_t err = mSurfaceTexture->setBufferCount(bufferCount);
    LOGE_IF(err, "ISurfaceTexture::setBufferCount(%d) returned %s",
            bufferCount, strerror(-err));

    if (err == NO_ERROR) {
        freeAllBuffers();
    }

    return err;
}

int SurfaceTextureClient::setBuffersDimensions(int w, int h)
{
    LOGV("SurfaceTextureClient::setBuffersDimensions");
    Mutex::Autolock lock(mMutex);

    if (w<0 || h<0)
        return BAD_VALUE;

    if ((w && !h) || (!w && h))
        return BAD_VALUE;

    mReqWidth = w;
    mReqHeight = h;

    status_t err = mSurfaceTexture->setCrop(Rect(0, 0));
    LOGE_IF(err, "ISurfaceTexture::setCrop(...) returned %s", strerror(-err));

    return err;
}

int SurfaceTextureClient::setBuffersFormat(int format)
{
    LOGV("SurfaceTextureClient::setBuffersFormat");
    Mutex::Autolock lock(mMutex);

    if (format<0)
        return BAD_VALUE;

    mReqFormat = format;

    return NO_ERROR;
}

int SurfaceTextureClient::setScalingMode(int mode)
{
    LOGV("SurfaceTextureClient::setScalingMode(%d)", mode);
    Mutex::Autolock lock(mMutex);
    // mode is validated on the server
    status_t err = mSurfaceTexture->setScalingMode(mode);
    LOGE_IF(err, "ISurfaceTexture::setScalingMode(%d) returned %s",
            mode, strerror(-err));

    return err;
}

int SurfaceTextureClient::setBuffersTransform(int transform)
{
    LOGV("SurfaceTextureClient::setBuffersTransform");
    ssize_t index = sBufferTransform.indexOfKey(this);
    sBufferTransform.replaceValueAt(index, transform);
    return NO_ERROR;
}

int SurfaceTextureClient::setBuffersTimestamp(int64_t timestamp)
{
    LOGV("SurfaceTextureClient::setBuffersTimestamp");
    Mutex::Autolock lock(mMutex);
    mTimestamp = timestamp;
    return NO_ERROR;
}

void SurfaceTextureClient::freeAllBuffers() {
    for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
        mSlots[i] = 0;
    }
}

// ----------------------------------------------------------------------
// the lock/unlock APIs must be used from the same thread

static status_t copyBlt(
        const sp<GraphicBuffer>& dst,
        const sp<GraphicBuffer>& src,
        const Region& reg)
{
    // src and dst with, height and format must be identical. no verification
    // is done here.
    status_t err;
    uint8_t const * src_bits = NULL;
    err = src->lock(GRALLOC_USAGE_SW_READ_OFTEN, reg.bounds(), (void**)&src_bits);
    LOGE_IF(err, "error locking src buffer %s", strerror(-err));

    uint8_t* dst_bits = NULL;
    err = dst->lock(GRALLOC_USAGE_SW_WRITE_OFTEN, reg.bounds(), (void**)&dst_bits);
    LOGE_IF(err, "error locking dst buffer %s", strerror(-err));

    Region::const_iterator head(reg.begin());
    Region::const_iterator tail(reg.end());
    if (head != tail && src_bits && dst_bits) {
        const size_t bpp = bytesPerPixel(src->format);
        const size_t dbpr = dst->stride * bpp;
        const size_t sbpr = src->stride * bpp;

        while (head != tail) {
            const Rect& r(*head++);
            ssize_t h = r.height();
            if (h <= 0) continue;
            size_t size = r.width() * bpp;
            uint8_t const * s = src_bits + (r.left + src->stride * r.top) * bpp;
            uint8_t       * d = dst_bits + (r.left + dst->stride * r.top) * bpp;
            if (dbpr==sbpr && size==sbpr) {
                size *= h;
                h = 1;
            }
            do {
                memcpy(d, s, size);
                d += dbpr;
                s += sbpr;
            } while (--h > 0);
        }
    }

    if (src_bits)
        src->unlock();

    if (dst_bits)
        dst->unlock();

    return err;
}

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

status_t SurfaceTextureClient::lock(
        ANativeWindow_Buffer* outBuffer, ARect* inOutDirtyBounds)
{
    if (mLockedBuffer != 0) {
        LOGE("Surface::lock failed, already locked");
        return INVALID_OPERATION;
    }

    if (!mConnectedToCpu) {
        int err = SurfaceTextureClient::connect(NATIVE_WINDOW_API_CPU);
        if (err) {
            return err;
        }
        // we're intending to do software rendering from this point
        setUsage(GRALLOC_USAGE_SW_READ_OFTEN | GRALLOC_USAGE_SW_WRITE_OFTEN);
    }

    ANativeWindowBuffer* out;
    status_t err = dequeueBuffer(&out);
    LOGE_IF(err, "dequeueBuffer failed (%s)", strerror(-err));
    if (err == NO_ERROR) {
        sp<GraphicBuffer> backBuffer(GraphicBuffer::getSelf(out));
        err = lockBuffer(backBuffer.get());
        LOGE_IF(err, "lockBuffer (handle=%p) failed (%s)",
                backBuffer->handle, strerror(-err));
        if (err == NO_ERROR) {
            const Rect bounds(backBuffer->width, backBuffer->height);

            Region newDirtyRegion;
            if (inOutDirtyBounds) {
                newDirtyRegion.set(static_cast<Rect const&>(*inOutDirtyBounds));
                newDirtyRegion.andSelf(bounds);
            } else {
                newDirtyRegion.set(bounds);
            }

            // figure out if we can copy the frontbuffer back
            const sp<GraphicBuffer>& frontBuffer(mPostedBuffer);
            const bool canCopyBack = (frontBuffer != 0 &&
                    backBuffer->width  == frontBuffer->width &&
                    backBuffer->height == frontBuffer->height &&
                    backBuffer->format == frontBuffer->format);

            int bufferCount;

            mSurfaceTexture->query(NATIVE_WINDOW_NUM_BUFFERS, &bufferCount);
            const int backBufferidx = getSlotFromBufferLocked(out);

            if (canCopyBack) {
                // copy the area that is invalid and not repainted this round
                Region oldDirtyRegion;
                for(int i = 0 ; i < bufferCount; i++ ) {
                    if(i != backBufferidx  && !mOldDirtyRegion[i].isEmpty())
                        oldDirtyRegion.orSelf(mOldDirtyRegion[i]);
                }

                const Region copyback(oldDirtyRegion.subtract(newDirtyRegion));
                if (!copyback.isEmpty())
                    copyBlt(backBuffer, frontBuffer, copyback);
            } else {
                // if we can't copy-back anything, modify the user's dirty
                // region to make sure they redraw the whole buffer
                newDirtyRegion.set(bounds);
                for(int i = 0 ; i < bufferCount; i++ ) {
                     mOldDirtyRegion[i].clear();
                }
            }

            // keep track of the are of the buffer that is "clean"
            // (ie: that will be redrawn)
            mOldDirtyRegion[backBufferidx] = newDirtyRegion;

            if (inOutDirtyBounds) {
                *inOutDirtyBounds = newDirtyRegion.getBounds();
            }

            void* vaddr;
            status_t res = backBuffer->lock(
                    GRALLOC_USAGE_SW_READ_OFTEN | GRALLOC_USAGE_SW_WRITE_OFTEN,
                    newDirtyRegion.bounds(), &vaddr);

            LOGW_IF(res, "failed locking buffer (handle = %p)",
                    backBuffer->handle);

            mLockedBuffer = backBuffer;
            outBuffer->width  = backBuffer->width;
            outBuffer->height = backBuffer->height;
            outBuffer->stride = backBuffer->stride;
            outBuffer->format = backBuffer->format;
            outBuffer->bits   = vaddr;
        }
    }
    return err;
}

status_t SurfaceTextureClient::unlockAndPost()
{
    if (mLockedBuffer == 0) {
        LOGE("Surface::unlockAndPost failed, no locked buffer");
        return INVALID_OPERATION;
    }

    status_t err = mLockedBuffer->unlock();
    LOGE_IF(err, "failed unlocking buffer (%p)", mLockedBuffer->handle);

    err = queueBuffer(mLockedBuffer.get());
    LOGE_IF(err, "queueBuffer (handle=%p) failed (%s)",
            mLockedBuffer->handle, strerror(-err));

    mPostedBuffer = mLockedBuffer;
    mLockedBuffer = 0;
    return err;
}

}; // namespace android