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, 14 insertions, 0 deletions

diff --git a/libs/gui/SurfaceComposerClient.cpp b/libs/gui/SurfaceComposerClient.cpp
index 902684cf03..88d3a7cb1d 100644
--- a/libs/gui/SurfaceComposerClient.cpp
+++ b/libs/gui/SurfaceComposerClient.cpp
@@ -22,6 +22,7 @@
 
 #include <android/gui/BnWindowInfosReportedListener.h>
 #include <android/gui/DisplayState.h>
+#include <android/gui/EdgeExtensionParameters.h>
 #include <android/gui/ISurfaceComposerClient.h>
 #include <android/gui/IWindowInfosListener.h>
 #include <android/gui/TrustedPresentationThresholds.h>
@@ -2330,6 +2331,19 @@ SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::setStret
     return *this;
 }
 
+SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::setEdgeExtensionEffect(
+        const sp<SurfaceControl>& sc, const gui::EdgeExtensionParameters& effect) {
+    layer_state_t* s = getLayerState(sc);
+    if (!s) {
+        mStatus = BAD_INDEX;
+        return *this;
+    }
+
+    s->what |= layer_state_t::eEdgeExtensionChanged;
+    s->edgeExtensionParameters = effect;
+    return *this;
+}
+
 SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::setBufferCrop(
         const sp<SurfaceControl>& sc, const Rect& bufferCrop) {
     layer_state_t* s = getLayerState(sc);