Add spellcheck and word suggestion to the prediction service

third_party/prediction/suggest/core/layout/geometry_utils.h

+/*
+ * Copyright (C) 2012 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.
+ */
+
+#ifndef LATINIME_GEOMETRY_UTILS_H
+#define LATINIME_GEOMETRY_UTILS_H
+
+#include <cmath>
+
+#include "third_party/prediction/defines.h"
+
+#define ROUND_FLOAT_10000(f) \
+  ((f) < 1000.0f && (f) > 0.001f) ? (floorf((f)*10000.0f) / 10000.0f) : (f)
+
+namespace latinime {
+
+class GeometryUtils {
+ public:
+  static inline float SQUARE_FLOAT(const float x) { return x * x; }
+
+  static AK_FORCE_INLINE float getAngle(const int x1,
+                                        const int y1,
+                                        const int x2,
+                                        const int y2) {
+    const int dx = x1 - x2;
+    const int dy = y1 - y2;
+    if (dx == 0 && dy == 0)
+      return 0.0f;
+    return atan2f(static_cast<float>(dy), static_cast<float>(dx));
+  }
+
+  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);
+    }
+    return diff;
+  }
+
+  static AK_FORCE_INLINE int getDistanceInt(const int x1,
+                                            const int y1,
+                                            const int x2,
+                                            const int y2) {
+    return static_cast<int>(
+        hypotf(static_cast<float>(x1 - x2), static_cast<float>(y1 - y2)));
+  }
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(GeometryUtils);
+};
+}  // namespace latinime
+#endif  // LATINIME_GEOMETRY_UTILS_H