[Mirror Layers] Added mirrorSurface API to enable mirroring (3/4)

Added a new SurfaceComposer API called mirrorSurface that allows a
client to request a mirror of a particular heirarchy starting from the
passed in layer. The API will return a SurfaceControl that's the parent
of the mirrored layer that can be updated by the client.

Test: MirrorLayerTest
Bug: 131622422
Change-Id: Ia6047f0334eabfc59d6222b2edfd4e9576ba31e5

1 files changed, 14 insertions, 0 deletions

diff --git a/libs/gui/SurfaceComposerClient.cpp b/libs/gui/SurfaceComposerClient.cpp
index 547e5f1be2..7b256f5c02 100644
--- a/libs/gui/SurfaceComposerClient.cpp
+++ b/libs/gui/SurfaceComposerClient.cpp
@@ -1505,6 +1505,20 @@ status_t SurfaceComposerClient::createSurfaceChecked(const String8& name, uint32
     return err;
 }
 
+sp<SurfaceControl> SurfaceComposerClient::mirrorSurface(SurfaceControl* mirrorFromSurface) {
+    if (mirrorFromSurface == nullptr) {
+        return nullptr;
+    }
+
+    sp<IBinder> handle;
+    sp<IBinder> mirrorFromHandle = mirrorFromSurface->getHandle();
+    status_t err = mClient->mirrorSurface(mirrorFromHandle, &handle);
+    if (err == NO_ERROR) {
+        return new SurfaceControl(this, handle, nullptr, true /* owned */);
+    }
+    return nullptr;
+}
+
 status_t SurfaceComposerClient::clearLayerFrameStats(const sp<IBinder>& token) const {
     if (mStatus != NO_ERROR) {
         return mStatus;