diff --git a/services/surfaceflinger/tests/common/LayerLifecycleManagerHelper.h b/services/surfaceflinger/tests/common/LayerLifecycleManagerHelper.h
index 3104dd4..ae380ad 100644
--- a/services/surfaceflinger/tests/common/LayerLifecycleManagerHelper.h
+++ b/services/surfaceflinger/tests/common/LayerLifecycleManagerHelper.h
@@ -515,6 +515,23 @@
         mLifecycleManager.applyTransactions(transactions);
     }
 
+    void setEdgeExtensionEffect(uint32_t id, int edge) {
+        std::vector<TransactionState> transactions;
+        transactions.emplace_back();
+        transactions.back().states.push_back({});
+
+        transactions.back().states.front().layerId = id;
+        transactions.back().states.front().state.what |= layer_state_t::eEdgeExtensionChanged;
+        transactions.back().states.front().state.edgeExtensionParameters =
+                gui::EdgeExtensionParameters();
+        transactions.back().states.front().state.edgeExtensionParameters.extendLeft = edge & LEFT;
+        transactions.back().states.front().state.edgeExtensionParameters.extendRight = edge & RIGHT;
+        transactions.back().states.front().state.edgeExtensionParameters.extendTop = edge & TOP;
+        transactions.back().states.front().state.edgeExtensionParameters.extendBottom =
+                edge & BOTTOM;
+        mLifecycleManager.applyTransactions(transactions);
+    }
+
 private:
     LayerLifecycleManager& mLifecycleManager;
 };
diff --git a/services/surfaceflinger/tests/unittests/LayerSnapshotTest.cpp b/services/surfaceflinger/tests/unittests/LayerSnapshotTest.cpp
index 2860345..9020723 100644
--- a/services/surfaceflinger/tests/unittests/LayerSnapshotTest.cpp
+++ b/services/surfaceflinger/tests/unittests/LayerSnapshotTest.cpp
@@ -27,6 +27,7 @@
 #include "LayerHierarchyTest.h"
 #include "ui/GraphicTypes.h"
 
+#include <com_android_graphics_libgui_flags.h>
 #include <com_android_graphics_surfaceflinger_flags.h>
 
 #define UPDATE_AND_VERIFY(BUILDER, ...)                                    \
@@ -1761,4 +1762,162 @@
     UPDATE_AND_VERIFY(mSnapshotBuilder, {2});
     EXPECT_TRUE(getSnapshot(1)->isHiddenByPolicy());
 }
+TEST_F(LayerSnapshotTest, edgeExtensionPropagatesInHierarchy) {
+    if (!com::android::graphics::libgui::flags::edge_extension_shader()) {
+        GTEST_SKIP() << "Skipping test because edge_extension_shader is off";
+    }
+    setCrop(1, Rect(0, 0, 20, 20));
+    setBuffer(1221,
+              std::make_shared<renderengine::mock::FakeExternalTexture>(20 /* width */,
+                                                                        20 /* height */,
+                                                                        42ULL /* bufferId */,
+                                                                        HAL_PIXEL_FORMAT_RGBA_8888,
+                                                                        0 /*usage*/));
+    setEdgeExtensionEffect(12, LEFT);
+    UPDATE_AND_VERIFY(mSnapshotBuilder, STARTING_ZORDER);
+
+    EXPECT_TRUE(getSnapshot({.id = 12})->edgeExtensionEffect.extendsEdge(LEFT));
+    EXPECT_TRUE(getSnapshot({.id = 121})->edgeExtensionEffect.extendsEdge(LEFT));
+    EXPECT_TRUE(getSnapshot({.id = 1221})->edgeExtensionEffect.extendsEdge(LEFT));
+
+    setEdgeExtensionEffect(12, RIGHT);
+    UPDATE_AND_VERIFY(mSnapshotBuilder, STARTING_ZORDER);
+
+    EXPECT_TRUE(getSnapshot({.id = 12})->edgeExtensionEffect.extendsEdge(RIGHT));
+    EXPECT_TRUE(getSnapshot({.id = 121})->edgeExtensionEffect.extendsEdge(RIGHT));
+    EXPECT_TRUE(getSnapshot({.id = 1221})->edgeExtensionEffect.extendsEdge(RIGHT));
+
+    setEdgeExtensionEffect(12, TOP);
+    UPDATE_AND_VERIFY(mSnapshotBuilder, STARTING_ZORDER);
+
+    EXPECT_TRUE(getSnapshot({.id = 12})->edgeExtensionEffect.extendsEdge(TOP));
+    EXPECT_TRUE(getSnapshot({.id = 121})->edgeExtensionEffect.extendsEdge(TOP));
+    EXPECT_TRUE(getSnapshot({.id = 1221})->edgeExtensionEffect.extendsEdge(TOP));
+
+    setEdgeExtensionEffect(12, BOTTOM);
+    UPDATE_AND_VERIFY(mSnapshotBuilder, STARTING_ZORDER);
+
+    EXPECT_TRUE(getSnapshot({.id = 12})->edgeExtensionEffect.extendsEdge(BOTTOM));
+    EXPECT_TRUE(getSnapshot({.id = 121})->edgeExtensionEffect.extendsEdge(BOTTOM));
+    EXPECT_TRUE(getSnapshot({.id = 1221})->edgeExtensionEffect.extendsEdge(BOTTOM));
+}
+
+TEST_F(LayerSnapshotTest, leftEdgeExtensionIncreaseBoundSizeWithinCrop) {
+    // The left bound is extended when shifting to the right
+    if (!com::android::graphics::libgui::flags::edge_extension_shader()) {
+        GTEST_SKIP() << "Skipping test because edge_extension_shader is off";
+    }
+    setCrop(1, Rect(0, 0, 20, 20));
+    const int texSize = 10;
+    setBuffer(1221,
+              std::make_shared<renderengine::mock::FakeExternalTexture>(texSize /* width */,
+                                                                        texSize /* height*/,
+                                                                        42ULL /* bufferId */,
+                                                                        HAL_PIXEL_FORMAT_RGBA_8888,
+                                                                        0 /*usage*/));
+    const float translation = 5.0;
+    setPosition(12, translation, 0);
+    setEdgeExtensionEffect(12, LEFT);
+    UPDATE_AND_VERIFY(mSnapshotBuilder, STARTING_ZORDER);
+    EXPECT_EQ(getSnapshot({.id = 1221})->transformedBounds.right, texSize + translation);
+    EXPECT_LT(getSnapshot({.id = 1221})->transformedBounds.left, translation);
+    EXPECT_GE(getSnapshot({.id = 1221})->transformedBounds.left, 0.0);
+}
+
+TEST_F(LayerSnapshotTest, rightEdgeExtensionIncreaseBoundSizeWithinCrop) {
+    // The right bound is extended when shifting to the left
+    if (!com::android::graphics::libgui::flags::edge_extension_shader()) {
+        GTEST_SKIP() << "Skipping test because edge_extension_shader is off";
+    }
+    const int crop = 20;
+    setCrop(1, Rect(0, 0, crop, crop));
+    const int texSize = 10;
+    setBuffer(1221,
+              std::make_shared<renderengine::mock::FakeExternalTexture>(texSize /* width */,
+                                                                        texSize /* height*/,
+                                                                        42ULL /* bufferId */,
+                                                                        HAL_PIXEL_FORMAT_RGBA_8888,
+                                                                        0 /*usage*/));
+    const float translation = -5.0;
+    setPosition(12, translation, 0);
+    setEdgeExtensionEffect(12, RIGHT);
+    UPDATE_AND_VERIFY(mSnapshotBuilder, STARTING_ZORDER);
+    EXPECT_EQ(getSnapshot({.id = 1221})->transformedBounds.left, 0);
+    EXPECT_GT(getSnapshot({.id = 1221})->transformedBounds.right, texSize + translation);
+    EXPECT_LE(getSnapshot({.id = 1221})->transformedBounds.right, (float)crop);
+}
+
+TEST_F(LayerSnapshotTest, topEdgeExtensionIncreaseBoundSizeWithinCrop) {
+    // The top bound is extended when shifting to the bottom
+    if (!com::android::graphics::libgui::flags::edge_extension_shader()) {
+        GTEST_SKIP() << "Skipping test because edge_extension_shader is off";
+    }
+    setCrop(1, Rect(0, 0, 20, 20));
+    const int texSize = 10;
+    setBuffer(1221,
+              std::make_shared<renderengine::mock::FakeExternalTexture>(texSize /* width */,
+                                                                        texSize /* height*/,
+                                                                        42ULL /* bufferId */,
+                                                                        HAL_PIXEL_FORMAT_RGBA_8888,
+                                                                        0 /*usage*/));
+    const float translation = 5.0;
+    setPosition(12, 0, translation);
+    setEdgeExtensionEffect(12, TOP);
+    UPDATE_AND_VERIFY(mSnapshotBuilder, STARTING_ZORDER);
+    EXPECT_EQ(getSnapshot({.id = 1221})->transformedBounds.bottom, texSize + translation);
+    EXPECT_LT(getSnapshot({.id = 1221})->transformedBounds.top, translation);
+    EXPECT_GE(getSnapshot({.id = 1221})->transformedBounds.top, 0.0);
+}
+
+TEST_F(LayerSnapshotTest, bottomEdgeExtensionIncreaseBoundSizeWithinCrop) {
+    // The bottom bound is extended when shifting to the top
+    if (!com::android::graphics::libgui::flags::edge_extension_shader()) {
+        GTEST_SKIP() << "Skipping test because edge_extension_shader is off";
+    }
+    const int crop = 20;
+    setCrop(1, Rect(0, 0, crop, crop));
+    const int texSize = 10;
+    setBuffer(1221,
+              std::make_shared<renderengine::mock::FakeExternalTexture>(texSize /* width */,
+                                                                        texSize /* height*/,
+                                                                        42ULL /* bufferId */,
+                                                                        HAL_PIXEL_FORMAT_RGBA_8888,
+                                                                        0 /*usage*/));
+    const float translation = -5.0;
+    setPosition(12, 0, translation);
+    setEdgeExtensionEffect(12, BOTTOM);
+    UPDATE_AND_VERIFY(mSnapshotBuilder, STARTING_ZORDER);
+    EXPECT_EQ(getSnapshot({.id = 1221})->transformedBounds.top, 0);
+    EXPECT_GT(getSnapshot({.id = 1221})->transformedBounds.bottom, texSize - translation);
+    EXPECT_LE(getSnapshot({.id = 1221})->transformedBounds.bottom, (float)crop);
+}
+
+TEST_F(LayerSnapshotTest, multipleEdgeExtensionIncreaseBoundSizeWithinCrop) {
+    // The left bound is extended when shifting to the right
+    if (!com::android::graphics::libgui::flags::edge_extension_shader()) {
+        GTEST_SKIP() << "Skipping test because edge_extension_shader is off";
+    }
+    const int crop = 20;
+    setCrop(1, Rect(0, 0, crop, crop));
+    const int texSize = 10;
+    setBuffer(1221,
+              std::make_shared<renderengine::mock::FakeExternalTexture>(texSize /* width */,
+                                                                        texSize /* height*/,
+                                                                        42ULL /* bufferId */,
+                                                                        HAL_PIXEL_FORMAT_RGBA_8888,
+                                                                        0 /*usage*/));
+    const float translation = 5.0;
+    setPosition(12, translation, translation);
+    setEdgeExtensionEffect(12, LEFT | RIGHT | TOP | BOTTOM);
+    UPDATE_AND_VERIFY(mSnapshotBuilder, STARTING_ZORDER);
+    EXPECT_GT(getSnapshot({.id = 1221})->transformedBounds.right, texSize + translation);
+    EXPECT_LE(getSnapshot({.id = 1221})->transformedBounds.right, (float)crop);
+    EXPECT_LT(getSnapshot({.id = 1221})->transformedBounds.left, translation);
+    EXPECT_GE(getSnapshot({.id = 1221})->transformedBounds.left, 0.0);
+    EXPECT_GT(getSnapshot({.id = 1221})->transformedBounds.bottom, texSize + translation);
+    EXPECT_LE(getSnapshot({.id = 1221})->transformedBounds.bottom, (float)crop);
+    EXPECT_LT(getSnapshot({.id = 1221})->transformedBounds.top, translation);
+    EXPECT_GE(getSnapshot({.id = 1221})->transformedBounds.top, 0);
+}
+
 } // namespace android::surfaceflinger::frontend