services/surfaceflinger/SurfaceFlingerConsumer.cpp

/*
 * Copyright (C) 2012 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 ATRACE_TAG ATRACE_TAG_GRAPHICS

#include "SurfaceFlingerConsumer.h"

#include <utils/Trace.h>
#include <utils/Errors.h>


namespace android {

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

status_t SurfaceFlingerConsumer::updateTexImage(BufferRejecter* rejecter)
{
    ATRACE_CALL();
    ALOGV("updateTexImage");
    Mutex::Autolock lock(mMutex);

    if (mAbandoned) {
        ALOGE("updateTexImage: SurfaceTexture is abandoned!");
        return NO_INIT;
    }

    // Make sure the EGL state is the same as in previous calls.
    status_t err = checkAndUpdateEglStateLocked();
    if (err != NO_ERROR) {
        return err;
    }

    BufferQueue::BufferItem item;

    // Acquire the next buffer.
    // In asynchronous mode the list is guaranteed to be one buffer
    // deep, while in synchronous mode we use the oldest buffer.
    err = acquireBufferLocked(&item);
    if (err != NO_ERROR) {
        if (err == BufferQueue::NO_BUFFER_AVAILABLE) {
            // This variant of updateTexImage does not guarantee that the
            // texture is bound, so no need to call glBindTexture.
            err = NO_ERROR;
        } else {
            ALOGE("updateTexImage: acquire failed: %s (%d)",
                strerror(-err), err);
        }
        return err;
    }


    // We call the rejecter here, in case the caller has a reason to
    // not accept this buffer.  This is used by SurfaceFlinger to
    // reject buffers which have the wrong size
    int buf = item.mBuf;
    if (rejecter && rejecter->reject(mSlots[buf].mGraphicBuffer, item)) {
        releaseBufferLocked(buf, EGL_NO_SYNC_KHR);
        return NO_ERROR;
    }

    // Release the previous buffer.
    err = releaseAndUpdateLocked(item);
    if (err != NO_ERROR) {
        return err;
    }

    // Bind the new buffer to the GL texture.
    // TODO: skip this on devices that support explicit sync
    // (glEGLImageTargetTexture2DOES provides required implicit sync;
    // without this we get wedged on older devices, but newer devices
    // don't need it.)
    return bindTextureImage();
}

// ---------------------------------------------------------------------------
}; // namespace android