diff options
| -rw-r--r-- | libs/gui/SurfaceTexture.cpp | 23 |
1 files changed, 9 insertions, 14 deletions
diff --git a/libs/gui/SurfaceTexture.cpp b/libs/gui/SurfaceTexture.cpp index 96ab284..0925001 100644 --- a/libs/gui/SurfaceTexture.cpp +++ b/libs/gui/SurfaceTexture.cpp @@ -488,24 +488,14 @@ status_t SurfaceTexture::setTransform(uint32_t transform) { status_t SurfaceTexture::updateTexImage() { LOGV("SurfaceTexture::updateTexImage"); - Mutex::Autolock lock(mMutex); - int buf = mCurrentTexture; + // In asynchronous mode the list is guaranteed to be one buffer + // deep, while in synchronous mode we use the oldest buffer. if (!mQueue.empty()) { - // in asynchronous mode the list is guaranteed to be one buffer deep, - // while in synchronous mode we use the oldest buffer Fifo::iterator front(mQueue.begin()); - buf = *front; - mQueue.erase(front); - if (mQueue.isEmpty()) { - mDequeueCondition.signal(); - } - } + int buf = *front; - // Initially both mCurrentTexture and buf are INVALID_BUFFER_SLOT, - // so this check will fail until a buffer gets queued. - if (mCurrentTexture != buf) { // Update the GL texture object. EGLImageKHR image = mSlots[buf].mEglImage; if (image == EGL_NO_IMAGE_KHR) { @@ -543,7 +533,7 @@ status_t SurfaceTexture::updateTexImage() { } if (mCurrentTexture != INVALID_BUFFER_SLOT) { - // the current buffer becomes FREE if it was still in the queued + // The current buffer becomes FREE if it was still in the queued // state. If it has already been given to the client // (synchronous mode), then it stays in DEQUEUED state. if (mSlots[mCurrentTexture].mBufferState == BufferSlot::QUEUED) @@ -558,11 +548,16 @@ status_t SurfaceTexture::updateTexImage() { mCurrentTransform = mSlots[buf].mTransform; mCurrentTimestamp = mSlots[buf].mTimestamp; computeCurrentTransformMatrix(); + + // Now that we've passed the point at which failures can happen, + // it's safe to remove the buffer from the front of the queue. + mQueue.erase(front); mDequeueCondition.signal(); } else { // We always bind the texture even if we don't update its contents. glBindTexture(mCurrentTextureTarget, mTexName); } + return OK; } |