mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-09-10 11:54:40 +00:00
44 lines
1.2 KiB
C++
44 lines
1.2 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
|
|
* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#ifndef MOZILLA_GFX_NUMERICTOOLS_H_
|
|
#define MOZILLA_GFX_NUMERICTOOLS_H_
|
|
|
|
namespace mozilla {
|
|
|
|
// XXX - Move these into mfbt/MathAlgorithms.h?
|
|
|
|
// Returns the largest multiple of aMultiplied that's <= x.
|
|
// Same as int32_t(floor(double(x) / aMultiplier)) * aMultiplier,
|
|
// but faster.
|
|
inline int32_t
|
|
RoundDownToMultiple(int32_t x, int32_t aMultiplier)
|
|
{
|
|
// We don't use float division + floor because that's hard for the compiler
|
|
// to optimize.
|
|
int mod = x % aMultiplier;
|
|
if (x > 0) {
|
|
return x - mod;
|
|
}
|
|
return mod ? x - aMultiplier - mod : x;
|
|
}
|
|
|
|
// Returns the smallest multiple of aMultiplied that's >= x.
|
|
// Same as int32_t(ceil(double(x) / aMultiplier)) * aMultiplier,
|
|
// but faster.
|
|
inline int32_t
|
|
RoundUpToMultiple(int32_t x, int32_t aMultiplier)
|
|
{
|
|
int mod = x % aMultiplier;
|
|
if (x > 0) {
|
|
return mod ? x + aMultiplier - mod : x;
|
|
}
|
|
return x - mod;
|
|
}
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif /* MOZILLA_GFX_NUMERICTOOLS_H_ */
|