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