Edge extension effect: shader reimplementation

X-axis activity transitions require the translation of the surfaces
involved. As this movement would create unwanted see-through, we would
have added side windows anchored to the moving activities, and textured
them by clamping their parents.

We are replacing the additional windows with the extension of the
surfaces, and filling the area without buffer with a shader.

See go/edge-extension-sksl for more info.

Bug: 322036393
Test: LayerSnapshotTest
Flag: EXEMPT (calls will be protected by wm shell with com.android.window.flags.edge_extension_shader)
Change-Id: I3682efd16a1b311d67a522bb85960f100948b2ea

1 files changed, 7 insertions, 0 deletions

diff --git a/libs/gui/LayerState.cpp b/libs/gui/LayerState.cpp
index 3745805aa3..307ae3990e 100644
--- a/libs/gui/LayerState.cpp
+++ b/libs/gui/LayerState.cpp
@@ -177,6 +177,7 @@ status_t layer_state_t::write(Parcel& output) const
     }
 
     SAFE_PARCEL(output.write, stretchEffect);
+    SAFE_PARCEL(output.writeParcelable, edgeExtensionParameters);
     SAFE_PARCEL(output.write, bufferCrop);
     SAFE_PARCEL(output.write, destinationFrame);
     SAFE_PARCEL(output.writeInt32, static_cast<uint32_t>(trustedOverlay));
@@ -306,6 +307,7 @@ status_t layer_state_t::read(const Parcel& input)
     }
 
     SAFE_PARCEL(input.read, stretchEffect);
+    SAFE_PARCEL(input.readParcelable, &edgeExtensionParameters);
     SAFE_PARCEL(input.read, bufferCrop);
     SAFE_PARCEL(input.read, destinationFrame);
     uint32_t trustedOverlayInt;
@@ -682,6 +684,10 @@ void layer_state_t::merge(const layer_state_t& other) {
         what |= eStretchChanged;
         stretchEffect = other.stretchEffect;
     }
+    if (other.what & eEdgeExtensionChanged) {
+        what |= eEdgeExtensionChanged;
+        edgeExtensionParameters = other.edgeExtensionParameters;
+    }
     if (other.what & eBufferCropChanged) {
         what |= eBufferCropChanged;
         bufferCrop = other.bufferCrop;
@@ -783,6 +789,7 @@ uint64_t layer_state_t::diff(const layer_state_t& other) const {
     CHECK_DIFF(diff, eAutoRefreshChanged, other, autoRefresh);
     CHECK_DIFF(diff, eTrustedOverlayChanged, other, trustedOverlay);
     CHECK_DIFF(diff, eStretchChanged, other, stretchEffect);
+    CHECK_DIFF(diff, eEdgeExtensionChanged, other, edgeExtensionParameters);
     CHECK_DIFF(diff, eBufferCropChanged, other, bufferCrop);
     CHECK_DIFF(diff, eDestinationFrameChanged, other, destinationFrame);
     if (other.what & eProducerDisconnect) diff |= eProducerDisconnect;