ui/gfx/geometry/size_f.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef UI_GFX_GEOMETRY_SIZE_F_H_
   6 #define UI_GFX_GEOMETRY_SIZE_F_H_
   7
   8 #include <cmath>
   9 #include <iosfwd>
  10 #include <string>
  11
  12 #include "base/compiler_specific.h"
  13 #include "ui/gfx/gfx_export.h"
  14
  15 namespace gfx {
  16
  17 // A floating version of gfx::Size.
  18 class GFX_EXPORT SizeF {
  19  public:
  20   SizeF() : width_(0.f), height_(0.f) {}
  21   SizeF(float width, float height)
  22       : width_(fmaxf(0, width)), height_(fmaxf(0, height)) {}
  23   ~SizeF() {}
  24
  25   float width() const { return width_; }
  26   float height() const { return height_; }
  27
  28   void set_width(float width) { width_ = fmaxf(0, width); }
  29   void set_height(float height) { height_ = fmaxf(0, height); }
  30
  31   float GetArea() const;
  32
  33   void SetSize(float width, float height) {
  34     set_width(width);
  35     set_height(height);
  36   }
  37
  38   void Enlarge(float grow_width, float grow_height);
  39
  40   void SetToMin(const SizeF& other);
  41   void SetToMax(const SizeF& other);
  42
  43   bool IsEmpty() const { return !width() || !height(); }
  44
  45   void Scale(float scale) {
  46     Scale(scale, scale);
  47   }
  48
  49   void Scale(float x_scale, float y_scale) {
  50     SetSize(width() * x_scale, height() * y_scale);
  51   }
  52
  53   std::string ToString() const;
  54
  55  private:
  56   float width_;
  57   float height_;
  58 };
  59
  60 inline bool operator==(const SizeF& lhs, const SizeF& rhs) {
  61   return lhs.width() == rhs.width() && lhs.height() == rhs.height();
  62 }
  63
  64 inline bool operator!=(const SizeF& lhs, const SizeF& rhs) {
  65   return !(lhs == rhs);
  66 }
  67
  68 GFX_EXPORT SizeF ScaleSize(const SizeF& p, float x_scale, float y_scale);
  69
  70 inline SizeF ScaleSize(const SizeF& p, float scale) {
  71   return ScaleSize(p, scale, scale);
  72 }
  73
  74 // This is declared here for use in gtest-based unit tests but is defined in
  75 // the gfx_test_support target. Depend on that to use this in your unit test.
  76 // This should not be used in production code - call ToString() instead.
  77 void PrintTo(const SizeF& size, ::std::ostream* os);
  78
  79 }  // namespace gfx
  80
  81 #endif  // UI_GFX_GEOMETRY_SIZE_F_H_