/src/FreeImage/Source/OpenEXR/IlmImf/ImfConvert.cpp
https://bitbucket.org/cabalistic/ogredeps/ · C++ · 139 lines · 71 code · 29 blank · 39 comment · 14 complexity · 2a952084e70d7e2c461d5128f785f74f MD5 · raw file
- ///////////////////////////////////////////////////////////////////////////
- //
- // 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