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// Copyright (c) 2012 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 UI_GFX_GEOMETRY_SIZE_F_H_
#define UI_GFX_GEOMETRY_SIZE_F_H_
#include <iosfwd>
#include <string>
#include "base/compiler_specific.h"
#include "base/gtest_prod_util.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/gfx_export.h"
namespace gfx {
FORWARD_DECLARE_TEST(SizeTest, TrivialDimensionTests);
FORWARD_DECLARE_TEST(SizeTest, ClampsToZero);
FORWARD_DECLARE_TEST(SizeTest, ConsistentClamping);
// A floating version of gfx::Size.
class GFX_EXPORT SizeF {
public:
constexpr SizeF() : width_(0.f), height_(0.f) {}
constexpr SizeF(float width, float height)
: width_(clamp(width)), height_(clamp(height)) {}
constexpr explicit SizeF(const Size& size)
: SizeF(static_cast<float>(size.width()),
static_cast<float>(size.height())) {}
constexpr float width() const { return width_; }
constexpr float height() const { return height_; }
void set_width(float width) { width_ = clamp(width); }
void set_height(float height) { height_ = clamp(height); }
float GetArea() const;
void SetSize(float width, float height) {
set_width(width);
set_height(height);
}
void Enlarge(float grow_width, float grow_height);
void SetToMin(const SizeF& other);
void SetToMax(const SizeF& other);
bool IsEmpty() const { return !width() || !height(); }
void Scale(float scale) {
Scale(scale, scale);
}
void Scale(float x_scale, float y_scale) {
SetSize(width() * x_scale, height() * y_scale);
}
std::string ToString() const;
private:
FRIEND_TEST_ALL_PREFIXES(SizeTest, TrivialDimensionTests);
FRIEND_TEST_ALL_PREFIXES(SizeTest, ClampsToZero);
FRIEND_TEST_ALL_PREFIXES(SizeTest, ConsistentClamping);
static constexpr float kTrivial = 8.f * std::numeric_limits<float>::epsilon();
static constexpr float clamp(float f) { return f > kTrivial ? f : 0.f; }
float width_;
float height_;
};
inline bool operator==(const SizeF& lhs, const SizeF& rhs) {
return lhs.width() == rhs.width() && lhs.height() == rhs.height();
}
inline bool operator!=(const SizeF& lhs, const SizeF& rhs) {
return !(lhs == rhs);
}
GFX_EXPORT SizeF ScaleSize(const SizeF& p, float x_scale, float y_scale);
inline SizeF ScaleSize(const SizeF& p, float scale) {
return ScaleSize(p, scale, scale);
}
// This is declared here for use in gtest-based unit tests but is defined in
// the //ui/gfx:test_support target. Depend on that to use this in your unit
// test. This should not be used in production code - call ToString() instead.
void PrintTo(const SizeF& size, ::std::ostream* os);
} // namespace gfx
#endif // UI_GFX_GEOMETRY_SIZE_F_H_
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