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Take advantage of sync points during screen cap.

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Do not wait for the screen capture to complete within surface flinger,
instead pass a sync point back with the captured gralloc buffer.

Change-Id: I7137c0e0fc710688d1d61f189159418fb27ea263
This commit is contained in:
Riley Andrews 2014-08-15 12:27:24 -07:00
parent b1f0f288e3
commit 866399093f
1 changed files with 38 additions and 20 deletions
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36
services/surfaceflinger/SurfaceFlinger.cpp
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@ -3111,6 +3111,7 @@ status_t SurfaceFlinger::captureScreenImplLocked(
*/
result = native_window_dequeue_buffer_and_wait(window, &buffer);
if (result == NO_ERROR) {
int syncFd = -1;
// create an EGLImage from the buffer so we can later
// turn it into a texture
EGLImageKHR image = eglCreateImageKHR(mEGLDisplay, EGL_NO_CONTEXT,
@ -3127,27 +3128,41 @@ status_t SurfaceFlinger::captureScreenImplLocked(
renderScreenImplLocked(hw, sourceCrop, reqWidth, reqHeight,
minLayerZ, maxLayerZ, true, useIdentityTransform);
// Create a sync point and wait on it, so we know the buffer is
// ready before we pass it along. We can't trivially call glFlush(),
// so we use a wait flag instead.
// TODO: pass a sync fd to queueBuffer() and let the consumer wait.
EGLSyncKHR sync = eglCreateSyncKHR(mEGLDisplay, EGL_SYNC_FENCE_KHR, NULL);
// Attempt to create a sync khr object that can produce a sync point. If that
// isn't available, create a non-dupable sync object in the fallback path and
// wait on it directly.
EGLSyncKHR sync;
if (!DEBUG_SCREENSHOTS) {
sync = eglCreateSyncKHR(mEGLDisplay, EGL_SYNC_NATIVE_FENCE_ANDROID, NULL);
} else {
sync = EGL_NO_SYNC_KHR;
}
if (sync != EGL_NO_SYNC_KHR) {
// get the sync fd
syncFd = eglDupNativeFenceFDANDROID(mEGLDisplay, sync);
if (syncFd == EGL_NO_NATIVE_FENCE_FD_ANDROID) {
ALOGW("captureScreen: failed to dup sync khr object");
syncFd = -1;
}
eglDestroySyncKHR(mEGLDisplay, sync);
} else {
// fallback path
sync = eglCreateSyncKHR(mEGLDisplay, EGL_SYNC_FENCE_KHR, NULL);
if (sync != EGL_NO_SYNC_KHR) {
EGLint result = eglClientWaitSyncKHR(mEGLDisplay, sync,
EGL_SYNC_FLUSH_COMMANDS_BIT_KHR, 2000000000 /*2 sec*/);
EGLint eglErr = eglGetError();
eglDestroySyncKHR(mEGLDisplay, sync);
if (result == EGL_TIMEOUT_EXPIRED_KHR) {
ALOGW("captureScreen: fence wait timed out");
} else {
ALOGW_IF(eglErr != EGL_SUCCESS,
"captureScreen: error waiting on EGL fence: %#x", eglErr);
}
eglDestroySyncKHR(mEGLDisplay, sync);
} else {
ALOGW("captureScreen: error creating EGL fence: %#x", eglGetError());
// not fatal
}
}
if (DEBUG_SCREENSHOTS) {
uint32_t* pixels = new uint32_t[reqWidth*reqHeight];
getRenderEngine().readPixels(0, 0, reqWidth, reqHeight, pixels);
@ -3165,7 +3180,10 @@ status_t SurfaceFlinger::captureScreenImplLocked(
} else {
result = BAD_VALUE;
}
window->queueBuffer(window, buffer, -1);
window->queueBuffer(window, buffer, syncFd);
if (syncFd != -1) {
close(syncFd);
}
}
} else {
result = BAD_VALUE;