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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_GEOMETRY_BLEND_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_GEOMETRY_BLEND_H_
#include "third_party/blink/renderer/platform/geometry/layout_unit.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/math_extras.h"
#include "ui/gfx/geometry/point_f.h"
#include <type_traits>
namespace blink {
inline int Blend(int from, int to, double progress) {
return static_cast<int>(lround(from + (to - from) * progress));
}
// For unsigned types.
template <typename T>
inline T Blend(T from, T to, double progress) {
static_assert(std::is_integral<T>::value,
"blend can only be used with integer types");
return ClampTo<T>(round(to > from ? from + (to - from) * progress
: from - (from - to) * progress));
}
inline double Blend(double from, double to, double progress) {
return from + (to - from) * progress;
}
inline float Blend(float from, float to, double progress) {
return static_cast<float>(from + (to - from) * progress);
}
inline LayoutUnit Blend(LayoutUnit from, LayoutUnit to, double progress) {
return LayoutUnit(from + (to - from) * progress);
}
inline gfx::PointF Blend(const gfx::PointF& from,
const gfx::PointF& to,
double progress) {
return gfx::PointF(Blend(from.x(), to.x(), progress),
Blend(from.y(), to.y(), progress));
}
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_GEOMETRY_BLEND_H_
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