1 files changed, 61 insertions, 0 deletions
diff --git a/libs/hwui/tests/unit/StretchEffectTests.cpp b/libs/hwui/tests/unit/StretchEffectTests.cpp
new file mode 100644
index 000000000000..f5e20a1d11c6
--- /dev/null
+++ b/libs/hwui/tests/unit/StretchEffectTests.cpp
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <gtest/gtest.h>
+#include <effects/StretchEffect.h>
+#include "tests/common/TestUtils.h"
+#include "Properties.h"
+
+using namespace android;
+using namespace android::uirenderer;
+
+TEST(StretchEffect, noStretchDirectionDoesNotRequireLayer) {
+  Properties::setStretchEffectBehavior(StretchEffectBehavior::ShaderHWUI);
+  auto stretchEffect = StretchEffect({.fX = 0.f, .fY = 0.f}, 100.f, 100.f);
+  ASSERT_FALSE(stretchEffect.requiresLayer());
+
+  Properties::setStretchEffectBehavior(StretchEffectBehavior::UniformScale);
+  ASSERT_FALSE(stretchEffect.requiresLayer());
+}
+
+TEST(StretchEffect, horizontalStretchRequiresLayer) {
+  Properties::setStretchEffectBehavior(StretchEffectBehavior::ShaderHWUI);
+  auto stretchEffect = StretchEffect({.fX = 1.f, .fY = 0.f}, 100.f, 100.f);
+  ASSERT_TRUE(stretchEffect.requiresLayer());
+
+  Properties::setStretchEffectBehavior(StretchEffectBehavior::UniformScale);
+  ASSERT_TRUE(stretchEffect.requiresLayer());
+}
+
+TEST(StretchEffect, verticalStretchRequiresLayer) {
+  Properties::setStretchEffectBehavior(StretchEffectBehavior::ShaderHWUI);
+
+  auto stretchEffect = StretchEffect({.fX = 0.f, .fY = 1.f}, 100.f, 100.f);
+  ASSERT_TRUE(stretchEffect.requiresLayer());
+
+  Properties::setStretchEffectBehavior(StretchEffectBehavior::UniformScale);
+  ASSERT_TRUE(stretchEffect.requiresLayer());
+}
+
+TEST(StretchEffect, bidirectionalStretchRequiresLayer) {
+  Properties::setStretchEffectBehavior(StretchEffectBehavior::ShaderHWUI);
+
+  auto stretchEffect = StretchEffect({.fX = 1.f, .fY = 1.f}, 100.f, 100.f);
+  ASSERT_TRUE(stretchEffect.requiresLayer());
+
+  Properties::setStretchEffectBehavior(StretchEffectBehavior::UniformScale);
+  ASSERT_TRUE(stretchEffect.requiresLayer());
+}
+\ No newline at end of file