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- // VirtualDub - Video processing and capture application
- // System library component
- // Copyright (C) 1998-2004 Avery Lee, All Rights Reserved.
- //
- // Beginning with 1.6.0, the VirtualDub system library is licensed
- // differently than the remainder of VirtualDub. This particular file is
- // thus licensed as follows (the "zlib" license):
- //
- // This software is provided 'as-is', without any express or implied
- // warranty. In no event will the authors be held liable for any
- // damages arising from the use of this software.
- //
- // Permission is granted to anyone to use this software for any purpose,
- // including commercial applications, and to alter it and redistribute it
- // freely, subject to the following restrictions:
- //
- // 1. The origin of this software must not be misrepresented; you must
- // not claim that you wrote the original software. If you use this
- // software in a product, an acknowledgment in the product
- // documentation would be appreciated but is not required.
- // 2. Altered source versions must be plainly marked as such, and must
- // not be misrepresented as being the original software.
- // 3. This notice may not be removed or altered from any source
- // distribution.
-
- #ifndef f_VD2_SYSTEM_FRACTION_H
- #define f_VD2_SYSTEM_FRACTION_H
-
- #include <vd2/system/vdtypes.h>
-
- class VDFraction {
- friend VDFraction operator*(unsigned long b, const VDFraction f);
- friend VDFraction operator*(int b, const VDFraction f);
- private:
- unsigned long hi, lo;
-
- static VDFraction reduce(uint64 hi, uint64 lo);
-
- public:
- VDFraction() {}
- explicit VDFraction(int i) : hi(i), lo(1) {}
- explicit VDFraction(unsigned long i) : hi(i), lo(1) { }
- explicit VDFraction(unsigned long i, unsigned long j) : hi(i), lo(j) {}
- explicit VDFraction(double d);
-
- bool operator<(VDFraction b) const;
- bool operator<=(VDFraction b) const;
- bool operator>(VDFraction b) const;
- bool operator>=(VDFraction b) const;
- bool operator==(VDFraction b) const;
- bool operator!=(VDFraction b) const;
-
- VDFraction operator*(VDFraction b) const;
- VDFraction operator/(VDFraction b) const;
-
- VDFraction operator*(unsigned long b) const;
- VDFraction operator/(unsigned long b) const;
-
- VDFraction& operator*=(VDFraction b);
- VDFraction& operator/=(VDFraction b);
- VDFraction& operator*=(unsigned long b);
- VDFraction& operator/=(unsigned long b);
-
- void Assign(unsigned long n, unsigned long d) {
- hi = n;
- lo = d;
- }
-
- sint64 scale64t(sint64) const;
- sint64 scale64r(sint64) const;
- sint64 scale64u(sint64) const;
- sint64 scale64it(sint64) const;
- sint64 scale64ir(sint64) const;
- sint64 scale64iu(sint64) const;
-
- double asDouble() const;
- double AsInverseDouble() const;
-
- unsigned long roundup32ul() const;
-
- unsigned long getHi() const { return hi; }
- unsigned long getLo() const { return lo; }
-
- VDFraction reduce() const { return reduce(hi, lo); }
-
- bool Parse(const char *s);
-
- static inline VDFraction reduce64(sint64 hi, sint64 lo) { return reduce(hi, lo); }
- };
-
- inline VDFraction operator*(unsigned long b, const VDFraction f) { return f*b; }
-
- typedef VDFraction Fraction;
-
- #endif
-