am 86639909: Take advantage of sync points during screen cap. (66a99219) · Commits · e / os / android_frameworks_native-old

services/surfaceflinger/SurfaceFlinger.cpp

+35 −17

Original line number	Diff line number	Diff line
		@@ -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;