test-hwc2: set layer plane alpha

Test: Add "#define HAVE_NO_SURFACE_FLINGER" to
          frameworks/native/libs/gui/BufferQueueCore.cpp.
      Recompile and flash.
      Run "mm" in frameworks/native/services/surfaceflinger/tests/hwc2.
      Push test-hwc2 to device.
      Run "adb root && adb shell stop".
      Run test case. Ex: "./test-hwc2"

Change-Id: I48146953f745dc650ead5a6e9d6f456cf5a9d7ef
diff --git a/services/surfaceflinger/tests/hwc2/Hwc2Test.cpp b/services/surfaceflinger/tests/hwc2/Hwc2Test.cpp
index 5d6baaa..4078411 100644
--- a/services/surfaceflinger/tests/hwc2/Hwc2Test.cpp
+++ b/services/surfaceflinger/tests/hwc2/Hwc2Test.cpp
@@ -390,6 +390,23 @@
         }
     }
 
+    void setLayerPlaneAlpha(hwc2_display_t display, hwc2_layer_t layer,
+            float alpha, hwc2_error_t* outErr = nullptr)
+    {
+        auto pfn = reinterpret_cast<HWC2_PFN_SET_LAYER_PLANE_ALPHA>(
+                getFunction(HWC2_FUNCTION_SET_LAYER_PLANE_ALPHA));
+        ASSERT_TRUE(pfn) << "failed to get function";
+
+        auto err = static_cast<hwc2_error_t>(pfn(mHwc2Device, display, layer,
+                alpha));
+        if (outErr) {
+            *outErr = err;
+        } else {
+            ASSERT_EQ(err, HWC2_ERROR_NONE) << "failed to set layer plane alpha "
+                    << alpha;
+        }
+    }
+
 protected:
     hwc2_function_pointer_t getFunction(hwc2_function_descriptor_t descriptor)
     {
@@ -751,6 +768,15 @@
             testLayer.getDataspace(), outErr));
 }
 
+void setPlaneAlpha(Hwc2Test* test, hwc2_display_t display, hwc2_layer_t layer,
+        const Hwc2TestLayer& testLayer, hwc2_error_t *outErr)
+{
+    ASSERT_NO_FATAL_FAILURE(test->setLayerBlendMode(display, layer,
+            testLayer.getBlendMode()));
+    EXPECT_NO_FATAL_FAILURE(test->setLayerPlaneAlpha(display, layer,
+            testLayer.getPlaneAlpha(), outErr));
+}
+
 bool advanceBlendMode(Hwc2TestLayer* testLayer)
 {
     return testLayer->advanceBlendMode();
@@ -766,6 +792,11 @@
     return testLayer->advanceDataspace();
 }
 
+bool advancePlaneAlpha(Hwc2TestLayer* testLayer)
+{
+    return testLayer->advancePlaneAlpha();
+}
+
 
 static const std::array<hwc2_function_descriptor_t, 42> requiredFunctions = {{
     HWC2_FUNCTION_ACCEPT_DISPLAY_CHANGES,
@@ -1668,3 +1699,30 @@
     ASSERT_NO_FATAL_FAILURE(setLayerPropertyBadLayer(Hwc2TestCoverage::Default,
             setDataspace));
 }
+
+/* TESTCASE: Tests that the HWC2 can set the plane alpha of a layer. */
+TEST_F(Hwc2Test, SET_LAYER_PLANE_ALPHA)
+{
+    ASSERT_NO_FATAL_FAILURE(setLayerProperty(Hwc2TestCoverage::Complete,
+            setPlaneAlpha, advancePlaneAlpha));
+}
+
+/* TESTCASE: Tests that the HWC2 can update the plane alpha of a layer. */
+TEST_F(Hwc2Test, SET_LAYER_PLANE_ALPHA_update)
+{
+    ASSERT_NO_FATAL_FAILURE(setLayerPropertyUpdate(Hwc2TestCoverage::Complete,
+            setPlaneAlpha, advancePlaneAlpha));
+}
+
+/* TESTCASE: Tests that the HWC2 cannot set a plane alpha for a bad layer. */
+TEST_F(Hwc2Test, SET_LAYER_PLANE_ALPHA_bad_layer)
+{
+    ASSERT_NO_FATAL_FAILURE(setLayerPropertyBadLayer(Hwc2TestCoverage::Default,
+            [] (Hwc2Test* test, hwc2_display_t display, hwc2_layer_t badLayer,
+                    const Hwc2TestLayer& testLayer, hwc2_error_t *outErr) {
+
+                    EXPECT_NO_FATAL_FAILURE(test->setLayerPlaneAlpha(display,
+                            badLayer, testLayer.getPlaneAlpha(), outErr));
+            }
+    ));
+}