[CRD iOS] Move UI stuff into a subdirectory

remoting/client/view_matrix.h

-// Copyright 2017 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef REMOTING_CLIENT_VIEW_MATRIX_H_
-#define REMOTING_CLIENT_VIEW_MATRIX_H_
-
-#include <array>
-
-namespace remoting {
-
-// A 2D non-skew equally scaled transformation matrix.
-// | SCALE, 0,     OFFSET_X, |
-// | 0,     SCALE, OFFSET_Y, |
-// | 0,     0,     1         |
-class ViewMatrix {
- public:
-  struct Vector2D {
-    float x;
-    float y;
-  };
-
-  // Same as Vector2D. This alias just serves as a context hint.
-  using Point = Vector2D;
-
-  // Creates an empty matrix (0 scale and offsets).
-  ViewMatrix();
-
-  ViewMatrix(float scale, const Vector2D& offset);
-
-  ~ViewMatrix();
-
-  // Applies the matrix on the point and returns the result.
-  Point MapPoint(const Point& point) const;
-
-  // Applies the matrix on the vector and returns the result. This only scales
-  // the vector and does not apply offset.
-  Vector2D MapVector(const Vector2D& vector) const;
-
-  // Sets the scale factor, with the pivot point at (0, 0). This WON'T affect
-  // the offset.
-  void SetScale(float scale);
-
-  // Returns the scale of this matrix.
-  float GetScale() const;
-
-  // Sets the offset.
-  void SetOffset(const Point& offset);
-
-  // Adjust the matrix M to M' such that:
-  // M * p_a = p_b => M' * p_a = scale * (p_b - pivot) + pivot
-  void PostScale(const Point& pivot, float scale);
-
-  // Applies translation to the matrix.
-  // M * p_a = p_b => M' * p_a = p_b + delta
-  void PostTranslate(const Vector2D& delta);
-
-  // Returns the inverse of this matrix.
-  ViewMatrix Invert() const;
-
-  // Returns true if the scale and offsets are both 0.
-  bool IsEmpty() const;
-
-  // Converts to the 3x3 matrix array.
-  std::array<float, 9> ToMatrixArray() const;
-
- private:
-  float scale_;
-  Vector2D offset_;
-};
-
-}  // namespace remoting
-
-#endif  // REMOTING_CLIENT_VIEW_MATRIX_H_