Add GeometryUtilsTest.

Change-Id: I6ea9ef137c2930ca8e8745fec829b9bcaf1d10b9

native/jni/NativeFileList.mk

@@ -123,6 +123,7 @@ LATIN_IME_CORE_TEST_FILES := \
     defines_test.cpp \
     suggest/core/dicnode/dic_node_pool_test.cpp \
     suggest/core/dictionary/bloom_filter_test.cpp \
+    suggest/core/layout/geometry_utils_test.cpp \
     suggest/core/layout/normal_distribution_2d_test.cpp \
     suggest/policyimpl/dictionary/structure/v4/content/language_model_dict_content_test.cpp \
     suggest/policyimpl/dictionary/structure/v4/content/probability_entry_test.cpp \

native/jni/src/suggest/core/layout/geometry_utils.h

@@ -38,13 +38,15 @@ class GeometryUtils {
     }
 
     static AK_FORCE_INLINE float getAngleDiff(const float a1, const float a2) {
-        const float deltaA = fabsf(a1 - a2);
-        const float diff = ROUND_FLOAT_10000(deltaA);
-        if (diff > M_PI_F) {
-            const float normalizedDiff = 2.0f * M_PI_F - diff;
-            return ROUND_FLOAT_10000(normalizedDiff);
+        static const float M_2PI_F = M_PI * 2.0f;
+        float delta = fabsf(a1 - a2);
+        if (delta > M_2PI_F) {
+            delta -= (M_2PI_F * static_cast<int>(delta / M_2PI_F));
         }
-        return diff;
+        if (delta > M_PI_F) {
+            delta = M_2PI_F - delta;
+        }
+        return ROUND_FLOAT_10000(delta);
     }
 
     static AK_FORCE_INLINE int getDistanceInt(const int x1, const int y1, const int x2,

native/jni/tests/suggest/core/layout/geometry_utils_test.cpp

@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2014 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 "suggest/core/layout/geometry_utils.h"
+
+#include <gtest/gtest.h>
+
+namespace latinime {
+namespace {
+
+::testing::AssertionResult ExpectAngleDiffEq(const char* expectedExpression,
+      const char* actualExpression, float expected, float actual) {
+    if (actual < 0.0f || M_PI_F < actual) {
+        return ::testing::AssertionFailure()
+              << "Must be in the range of [0.0f, M_PI_F]."
+              << " expected: " << expected
+              << " actual: " << actual;
+    }
+    return ::testing::internal::CmpHelperFloatingPointEQ<float>(
+            expectedExpression, actualExpression, expected, actual);
+}
+
+#define EXPECT_ANGLE_DIFF_EQ(expected, actual) \
+        EXPECT_PRED_FORMAT2(ExpectAngleDiffEq, expected, actual);
+
+TEST(GeometryUtilsTest, testSquareFloat) {
+    const float test_data[] = { 0.0f, 1.0f, 123.456f, -1.0f, -9876.54321f };
+    for (const float value : test_data) {
+        EXPECT_FLOAT_EQ(value * value, GeometryUtils::SQUARE_FLOAT(value));
+    }
+}
+
+TEST(GeometryUtilsTest, testGetAngle) {
+    EXPECT_FLOAT_EQ(0.0f, GeometryUtils::getAngle(0, 0, 0, 0));
+    EXPECT_FLOAT_EQ(0.0f, GeometryUtils::getAngle(100, -10, 100, -10));
+
+    EXPECT_FLOAT_EQ(M_PI_F / 4.0f, GeometryUtils::getAngle(1, 1, 0, 0));
+    EXPECT_FLOAT_EQ(M_PI_F, GeometryUtils::getAngle(-1, 0, 0, 0));
+
+    EXPECT_FLOAT_EQ(GeometryUtils::getAngle(0, 0, -1, 0), GeometryUtils::getAngle(1, 0, 0, 0));
+    EXPECT_FLOAT_EQ(GeometryUtils::getAngle(1, 2, 3, 4),
+            GeometryUtils::getAngle(100, 200, 300, 400));
+}
+
+TEST(GeometryUtilsTest, testGetAngleDiff) {
+    EXPECT_ANGLE_DIFF_EQ(0.0f, GeometryUtils::getAngleDiff(0.0f, 0.0f));
+    EXPECT_ANGLE_DIFF_EQ(0.0f, GeometryUtils::getAngleDiff(10000.0f, 10000.0f));
+    EXPECT_ANGLE_DIFF_EQ(ROUND_FLOAT_10000(M_PI_F),
+            GeometryUtils::getAngleDiff(0.0f, M_PI_F));
+    EXPECT_ANGLE_DIFF_EQ(ROUND_FLOAT_10000(M_PI_F / 6.0f),
+            GeometryUtils::getAngleDiff(M_PI_F / 3.0f, M_PI_F / 2.0f));
+    EXPECT_ANGLE_DIFF_EQ(ROUND_FLOAT_10000(M_PI_F / 2.0f),
+            GeometryUtils::getAngleDiff(0.0f, M_PI_F * 1.5f));
+    EXPECT_ANGLE_DIFF_EQ(0.0f, GeometryUtils::getAngleDiff(0.0f, M_PI_F * 1024.0f));
+    EXPECT_ANGLE_DIFF_EQ(0.0f, GeometryUtils::getAngleDiff(-M_PI_F, M_PI_F));
+}
+
+TEST(GeometryUtilsTest, testGetDistanceInt) {
+    EXPECT_EQ(0, GeometryUtils::getDistanceInt(0, 0, 0, 0));
+    EXPECT_EQ(0, GeometryUtils::getAngle(100, -10, 100, -10));
+
+    EXPECT_EQ(5, GeometryUtils::getDistanceInt(0, 0, 5, 0));
+    EXPECT_EQ(5, GeometryUtils::getDistanceInt(0, 0, 3, 4));
+    EXPECT_EQ(5, GeometryUtils::getDistanceInt(0, -4, 3, 0));
+    EXPECT_EQ(5, GeometryUtils::getDistanceInt(0, 0, -3, -4));
+    EXPECT_EQ(500, GeometryUtils::getDistanceInt(0, 0, 300, -400));
+}
+
+}  // namespace
+}  // namespace latinime