mirror of
https://github.com/opencv/opencv.git
synced 2024-12-11 22:59:16 +08:00
140 lines
3.3 KiB
C++
140 lines
3.3 KiB
C++
///////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// Copyright (c) 2002, Industrial Light & Magic, a division of Lucas
|
|
// Digital Ltd. LLC
|
|
//
|
|
// All rights reserved.
|
|
//
|
|
// Redistribution and use in source and binary forms, with or without
|
|
// modification, are permitted provided that the following conditions are
|
|
// met:
|
|
// * Redistributions of source code must retain the above copyright
|
|
// notice, this list of conditions and the following disclaimer.
|
|
// * Redistributions in binary form must reproduce the above
|
|
// copyright notice, this list of conditions and the following disclaimer
|
|
// in the documentation and/or other materials provided with the
|
|
// distribution.
|
|
// * Neither the name of Industrial Light & Magic nor the names of
|
|
// its contributors may be used to endorse or promote products derived
|
|
// from this software without specific prior written permission.
|
|
//
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
//
|
|
///////////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
//
|
|
// Routines for converting between pixel data types,
|
|
// with well-defined behavior for exceptional cases.
|
|
//
|
|
//-----------------------------------------------------------------------------
|
|
|
|
#include <ImfConvert.h>
|
|
#include <limits.h>
|
|
|
|
namespace Imf {
|
|
namespace {
|
|
|
|
inline bool
|
|
isNegative (float f)
|
|
{
|
|
union {float f; int i;} u;
|
|
u.f = f;
|
|
return (u.i & 0x80000000) != 0;
|
|
}
|
|
|
|
|
|
inline bool
|
|
isNan (float f)
|
|
{
|
|
union {float f; int i;} u;
|
|
u.f = f;
|
|
return (u.i & 0x7fffffff) > 0x7f800000;
|
|
}
|
|
|
|
|
|
inline bool
|
|
isInfinity (float f)
|
|
{
|
|
union {float f; int i;} u;
|
|
u.f = f;
|
|
return (u.i & 0x7fffffff) == 0x7f800000;
|
|
}
|
|
|
|
|
|
inline bool
|
|
isFinite (float f)
|
|
{
|
|
union {float f; int i;} u;
|
|
u.f = f;
|
|
return (u.i & 0x7f800000) != 0x7f800000;
|
|
}
|
|
|
|
} // namespace
|
|
|
|
|
|
unsigned int
|
|
halfToUint (half h)
|
|
{
|
|
if (h.isNegative() || h.isNan())
|
|
return 0;
|
|
|
|
if (h.isInfinity())
|
|
return UINT_MAX;
|
|
|
|
return (unsigned int) h;
|
|
}
|
|
|
|
|
|
unsigned int
|
|
floatToUint (float f)
|
|
{
|
|
if (isNegative (f) || isNan (f))
|
|
return 0;
|
|
|
|
if (isInfinity (f) || f > UINT_MAX)
|
|
return UINT_MAX;
|
|
|
|
return (unsigned int) f;
|
|
}
|
|
|
|
|
|
half
|
|
uintToHalf (unsigned int ui)
|
|
{
|
|
if (ui > HALF_MAX)
|
|
return half::posInf();
|
|
|
|
return half (ui);
|
|
}
|
|
|
|
|
|
half
|
|
floatToHalf (float f)
|
|
{
|
|
if (isFinite (f))
|
|
{
|
|
if (f > HALF_MAX)
|
|
return half::posInf();
|
|
|
|
if (f < -HALF_MAX)
|
|
return half::negInf();
|
|
}
|
|
|
|
return half (f);
|
|
}
|
|
|
|
|
|
} // namespace Imf
|