SurfaceFlinger: Add parent-less relative layering.
This is a temporary functionality for the intermediate state where not
all child-surface like things in WM land are ported to use Child
Surfaces. In particular, we have ported SurfaceView to use child
surfaces and relative Z ordering. However the TV frameworks provide a
View framework component which overlays views over the SurfaceView but
below the main application window. Since we have not ported View
framework surfaces to use child layers, there is nothing the WM or
View Framework can do about this situation. Luckily the WM API's to
have requested this are @hide but we have the one media framework
component using it. In order to solve this issue we provide a method
to set Z ordering relative to another window without inheriting
its coordinate space as a child window would. This way the WM can
recognize these TYPE_APPLICATION_MEDIA_OVERLAY windows and Z-order
them at -1 with respect to the parents (and the SurfaceView can be at
-2).
Test: Included in transaction tests. Also manual test of bug repro steps with accomp frameworks/base CL
Bug: 36693738
Change-Id: I921852d3d34f67f79ec745b9703f9e679867e7a1
diff --git a/services/surfaceflinger/Layer.cpp b/services/surfaceflinger/Layer.cpp
index c211c7b..b10d437 100644
--- a/services/surfaceflinger/Layer.cpp
+++ b/services/surfaceflinger/Layer.cpp
@@ -1719,10 +1719,55 @@
mCurrentState.sequence++;
mCurrentState.z = z;
mCurrentState.modified = true;
+
+ // Discard all relative layering.
+ if (mCurrentState.zOrderRelativeOf != nullptr) {
+ sp<Layer> strongRelative = mCurrentState.zOrderRelativeOf.promote();
+ if (strongRelative != nullptr) {
+ strongRelative->removeZOrderRelative(this);
+ }
+ mCurrentState.zOrderRelativeOf = nullptr;
+ }
setTransactionFlags(eTransactionNeeded);
return true;
}
+void Layer::removeZOrderRelative(const wp<Layer>& relative) {
+ mCurrentState.zOrderRelatives.remove(relative);
+ mCurrentState.sequence++;
+ mCurrentState.modified = true;
+ setTransactionFlags(eTransactionNeeded);
+}
+
+void Layer::addZOrderRelative(const wp<Layer>& relative) {
+ mCurrentState.zOrderRelatives.add(relative);
+ mCurrentState.modified = true;
+ mCurrentState.sequence++;
+ setTransactionFlags(eTransactionNeeded);
+}
+
+bool Layer::setRelativeLayer(const sp<IBinder>& relativeToHandle, int32_t z) {
+ sp<Handle> handle = static_cast<Handle*>(relativeToHandle.get());
+ if (handle == nullptr) {
+ return false;
+ }
+ sp<Layer> relative = handle->owner.promote();
+ if (relative == nullptr) {
+ return false;
+ }
+
+ mCurrentState.sequence++;
+ mCurrentState.modified = true;
+ mCurrentState.z = z;
+
+ mCurrentState.zOrderRelativeOf = relative;
+ relative->addZOrderRelative(this);
+
+ setTransactionFlags(eTransactionNeeded);
+
+ return true;
+}
+
bool Layer::setSize(uint32_t w, uint32_t h) {
if (mCurrentState.requested.w == w && mCurrentState.requested.h == h)
return false;
@@ -2506,40 +2551,70 @@
return mDrawingState.z;
}
+LayerVector Layer::makeTraversalList() {
+ if (mDrawingState.zOrderRelatives.size() == 0) {
+ return mDrawingChildren;
+ }
+ LayerVector traverse;
+
+ for (const wp<Layer>& weakRelative : mDrawingState.zOrderRelatives) {
+ sp<Layer> strongRelative = weakRelative.promote();
+ if (strongRelative != nullptr) {
+ traverse.add(strongRelative);
+ } else {
+ // We need to erase from current state instead of drawing
+ // state so we don't overwrite when copying
+ // the current state to the drawing state.
+ mCurrentState.zOrderRelatives.remove(weakRelative);
+ }
+ }
+
+ for (const sp<Layer>& child : mDrawingChildren) {
+ traverse.add(child);
+ }
+
+ return traverse;
+}
+
/**
- * Negatively signed children are before 'this' in Z-order.
+ * Negatively signed relatives are before 'this' in Z-order.
*/
void Layer::traverseInZOrder(const std::function<void(Layer*)>& exec) {
+ LayerVector list = makeTraversalList();
+
size_t i = 0;
- for (; i < mDrawingChildren.size(); i++) {
- const auto& child = mDrawingChildren[i];
- if (child->getZ() >= 0)
+ for (; i < list.size(); i++) {
+ const auto& relative = list[i];
+ if (relative->getZ() >= 0) {
break;
- child->traverseInZOrder(exec);
+ }
+ relative->traverseInZOrder(exec);
}
exec(this);
- for (; i < mDrawingChildren.size(); i++) {
- const auto& child = mDrawingChildren[i];
- child->traverseInZOrder(exec);
+ for (; i < list.size(); i++) {
+ const auto& relative = list[i];
+ relative->traverseInZOrder(exec);
}
}
/**
- * Positively signed children are before 'this' in reverse Z-order.
+ * Positively signed relatives are before 'this' in reverse Z-order.
*/
void Layer::traverseInReverseZOrder(const std::function<void(Layer*)>& exec) {
+ LayerVector list = makeTraversalList();
+
int32_t i = 0;
- for (i = mDrawingChildren.size()-1; i>=0; i--) {
- const auto& child = mDrawingChildren[i];
- if (child->getZ() < 0) {
+ for (i = list.size()-1; i>=0; i--) {
+ const auto& relative = list[i];
+ if (relative->getZ() < 0) {
break;
}
- child->traverseInReverseZOrder(exec);
+ relative->traverseInReverseZOrder(exec);
}
exec(this);
for (; i>=0; i--) {
- const auto& child = mDrawingChildren[i];
- child->traverseInReverseZOrder(exec);
+ const auto& relative = list[i];
+ relative->traverseInReverseZOrder(exec);
}
}