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      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 <iosfwd>
      9 #include <string>
     10 
     11 #include "base/compiler_specific.h"
     12 #include "base/gtest_prod_util.h"
     13 #include "ui/gfx/geometry/size.h"
     14 #include "ui/gfx/gfx_export.h"
     15 
     16 namespace gfx {
     17 
     18 FORWARD_DECLARE_TEST(SizeTest, TrivialDimensionTests);
     19 FORWARD_DECLARE_TEST(SizeTest, ClampsToZero);
     20 FORWARD_DECLARE_TEST(SizeTest, ConsistentClamping);
     21 
     22 // A floating version of gfx::Size.
     23 class GFX_EXPORT SizeF {
     24  public:
     25   constexpr SizeF() : width_(0.f), height_(0.f) {}
     26   constexpr SizeF(float width, float height)
     27       : width_(clamp(width)), height_(clamp(height)) {}
     28 
     29   constexpr explicit SizeF(const Size& size)
     30       : SizeF(static_cast<float>(size.width()),
     31               static_cast<float>(size.height())) {}
     32 
     33   constexpr float width() const { return width_; }
     34   constexpr float height() const { return height_; }
     35 
     36   void set_width(float width) { width_ = clamp(width); }
     37   void set_height(float height) { height_ = clamp(height); }
     38 
     39   float GetArea() const;
     40 
     41   void SetSize(float width, float height) {
     42     set_width(width);
     43     set_height(height);
     44   }
     45 
     46   void Enlarge(float grow_width, float grow_height);
     47 
     48   void SetToMin(const SizeF& other);
     49   void SetToMax(const SizeF& other);
     50 
     51   bool IsEmpty() const { return !width() || !height(); }
     52 
     53   void Scale(float scale) {
     54     Scale(scale, scale);
     55   }
     56 
     57   void Scale(float x_scale, float y_scale) {
     58     SetSize(width() * x_scale, height() * y_scale);
     59   }
     60 
     61   std::string ToString() const;
     62 
     63  private:
     64   FRIEND_TEST_ALL_PREFIXES(SizeTest, TrivialDimensionTests);
     65   FRIEND_TEST_ALL_PREFIXES(SizeTest, ClampsToZero);
     66   FRIEND_TEST_ALL_PREFIXES(SizeTest, ConsistentClamping);
     67 
     68   static constexpr float kTrivial = 8.f * std::numeric_limits<float>::epsilon();
     69 
     70   static constexpr float clamp(float f) { return f > kTrivial ? f : 0.f; }
     71 
     72   float width_;
     73   float height_;
     74 };
     75 
     76 inline bool operator==(const SizeF& lhs, const SizeF& rhs) {
     77   return lhs.width() == rhs.width() && lhs.height() == rhs.height();
     78 }
     79 
     80 inline bool operator!=(const SizeF& lhs, const SizeF& rhs) {
     81   return !(lhs == rhs);
     82 }
     83 
     84 GFX_EXPORT SizeF ScaleSize(const SizeF& p, float x_scale, float y_scale);
     85 
     86 inline SizeF ScaleSize(const SizeF& p, float scale) {
     87   return ScaleSize(p, scale, scale);
     88 }
     89 
     90 // This is declared here for use in gtest-based unit tests but is defined in
     91 // the //ui/gfx:test_support target. Depend on that to use this in your unit
     92 // test. This should not be used in production code - call ToString() instead.
     93 void PrintTo(const SizeF& size, ::std::ostream* os);
     94 
     95 }  // namespace gfx
     96 
     97 #endif  // UI_GFX_GEOMETRY_SIZE_F_H_
     98