Merge "Fix screenshot when navigating between tasks" (c144dc15) · Commits · e / os / android_frameworks_base

services/core/java/com/android/server/wm/TaskSnapshotController.java

+41 −25

Original line number	Diff line number	Diff line
		@@ -38,7 +38,6 @@ import android.view.DisplayListCanvas;
		import android.view.RenderNode;
		import android.view.SurfaceControl;
		import android.view.ThreadedRenderer;
		import android.view.View;
		import android.view.WindowManager.LayoutParams;

		import com.android.internal.annotations.VisibleForTesting;
		@@ -219,15 +218,32 @@ class TaskSnapshotController {
		return TaskSnapshotSurface.create(mService, token, snapshot);
		}

		private TaskSnapshot snapshotTask(Task task) {
		final AppWindowToken top = task.getTopChild();
		if (top == null) {
		return null;
		/**
		* Find the window for a given task to take a snapshot. Top child of the task is usually the one
		* we're looking for, but during app transitions, trampoline activities can appear in the
		* children, which should be ignored.
		*/
		@Nullable private AppWindowToken findAppTokenForSnapshot(Task task) {
		for (int i = task.getChildCount() - 1; i >= 0; --i) {
		final AppWindowToken appWindowToken = task.getChildAt(i);
		if (appWindowToken == null \|\| !appWindowToken.isSurfaceShowing()
		\|\| appWindowToken.findMainWindow() == null) {
		continue;
		}
		final boolean hasVisibleChild = appWindowToken.forAllWindows(
		// Ensure at least one window for the top app is visible before attempting to
		// take a screenshot. Visible here means that the WSA surface is shown and has
		// an alpha greater than 0.
		ws -> ws.mWinAnimator != null && ws.mWinAnimator.getShown()
		&& ws.mWinAnimator.mLastAlpha > 0f, true /* traverseTopToBottom */);
		if (hasVisibleChild) {
		return appWindowToken;
		}
		}
		final WindowState mainWindow = top.findMainWindow();
		if (mainWindow == null) {
		return null;
		}

		@Nullable private TaskSnapshot snapshotTask(Task task) {
		if (!mService.mPolicy.isScreenOn()) {
		if (DEBUG_SCREENSHOT) {
		Slog.i(TAG_WM, "Attempted to take screenshot while display was off.");
		@@ -235,27 +251,22 @@ class TaskSnapshotController {
		return null;
		}
		if (task.getSurfaceControl() == null) {
		if (DEBUG_SCREENSHOT) {
		Slog.w(TAG_WM, "Failed to take screenshot. No surface control for " + task);
		}
		return null;
		}

		if (top.hasCommittedReparentToAnimationLeash()) {
		final AppWindowToken appWindowToken = findAppTokenForSnapshot(task);
		if (appWindowToken == null) {
		if (DEBUG_SCREENSHOT) {
		Slog.w(TAG_WM, "Failed to take screenshot. App is animating " + top);
		Slog.w(TAG_WM, "Failed to take screenshot. No visible windows for " + task);
		}
		return null;
		}

		final boolean hasVisibleChild = top.forAllWindows(
		// Ensure at least one window for the top app is visible before attempting to take
		// a screenshot. Visible here means that the WSA surface is shown and has an alpha
		// greater than 0.
		ws -> (ws.mAppToken == null \|\| ws.mAppToken.isSurfaceShowing())
		&& ws.mWinAnimator != null && ws.mWinAnimator.getShown()
		&& ws.mWinAnimator.mLastAlpha > 0f, true);

		if (!hasVisibleChild) {
		if (appWindowToken.hasCommittedReparentToAnimationLeash()) {
		if (DEBUG_SCREENSHOT) {
		Slog.w(TAG_WM, "Failed to take screenshot. No visible windows for " + task);
		Slog.w(TAG_WM, "Failed to take screenshot. App is animating " + appWindowToken);
		}
		return null;
		}
		@@ -265,19 +276,24 @@ class TaskSnapshotController {
		task.getBounds(mTmpRect);
		mTmpRect.offsetTo(0, 0);

		final WindowState mainWindow = appWindowToken.findMainWindow();
		if (mainWindow == null) {
		Slog.w(TAG_WM, "Failed to take screenshot. No main window for " + task);
		return null;
		}
		final GraphicBuffer buffer = SurfaceControl.captureLayers(
		task.getSurfaceControl().getHandle(), mTmpRect, scaleFraction);
		final boolean isWindowTranslucent = mainWindow.getAttrs().format != PixelFormat.OPAQUE;
		if (buffer == null \|\| buffer.getWidth() <= 1 \|\| buffer.getHeight() <= 1) {
		if (DEBUG_SCREENSHOT) {
		Slog.w(TAG_WM, "Failed to take screenshot for " + task);
		}
		return null;
		}
		return new TaskSnapshot(buffer, top.getConfiguration().orientation,
		final boolean isWindowTranslucent = mainWindow.getAttrs().format != PixelFormat.OPAQUE;
		return new TaskSnapshot(buffer, appWindowToken.getConfiguration().orientation,
		getInsets(mainWindow), isLowRamDevice /* reduced /, scaleFraction / scale */,
		true /* isRealSnapshot */, task.getWindowingMode(), getSystemUiVisibility(task),
		!top.fillsParent() \|\| isWindowTranslucent);
		!appWindowToken.fillsParent() \|\| isWindowTranslucent);
		}

		private boolean shouldDisableSnapshots() {