| 1 | // |
|---|
| 2 | // SPDX-License-Identifier: BSD-3-Clause |
|---|
| 3 | // Copyright (c) Contributors to the OpenEXR Project. |
|---|
| 4 | // |
|---|
| 5 | |
|---|
| 6 | #ifndef INCLUDED_IMF_CONVERT_H |
|---|
| 7 | #define INCLUDED_IMF_CONVERT_H |
|---|
| 8 | |
|---|
| 9 | //----------------------------------------------------------------------------- |
|---|
| 10 | // |
|---|
| 11 | // Routines for converting between pixel data types, |
|---|
| 12 | // with well-defined behavior for exceptional cases, |
|---|
| 13 | // without depending on how hardware and operating |
|---|
| 14 | // system handle integer overflows and floating-point |
|---|
| 15 | // exceptions. |
|---|
| 16 | // |
|---|
| 17 | //----------------------------------------------------------------------------- |
|---|
| 18 | |
|---|
| 19 | #include "ImfExport.h" |
|---|
| 20 | #include "ImfNamespace.h" |
|---|
| 21 | |
|---|
| 22 | #include <half.h> |
|---|
| 23 | |
|---|
| 24 | OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER |
|---|
| 25 | |
|---|
| 26 | |
|---|
| 27 | //--------------------------------------------------------- |
|---|
| 28 | // Conversion from half or float to unsigned int: |
|---|
| 29 | // |
|---|
| 30 | // input result |
|---|
| 31 | // --------------------------------------------------- |
|---|
| 32 | // |
|---|
| 33 | // finite, >= 0 input, cast to unsigned int |
|---|
| 34 | // (rounds towards zero) |
|---|
| 35 | // |
|---|
| 36 | // finite, < 0 0 |
|---|
| 37 | // |
|---|
| 38 | // NaN 0 |
|---|
| 39 | // |
|---|
| 40 | // +infinity UINT_MAX |
|---|
| 41 | // |
|---|
| 42 | // -infinity 0 |
|---|
| 43 | // |
|---|
| 44 | //--------------------------------------------------------- |
|---|
| 45 | |
|---|
| 46 | IMF_EXPORT unsigned int halfToUint (half h); |
|---|
| 47 | IMF_EXPORT unsigned int floatToUint (float f); |
|---|
| 48 | |
|---|
| 49 | |
|---|
| 50 | //--------------------------------------------------------- |
|---|
| 51 | // Conversion from unsigned int or float to half: |
|---|
| 52 | // |
|---|
| 53 | // input result |
|---|
| 54 | // --------------------------------------------------- |
|---|
| 55 | // |
|---|
| 56 | // finite, closest possible half |
|---|
| 57 | // magnitude <= HALF_MAX |
|---|
| 58 | // |
|---|
| 59 | // finite, > HALF_MAX +infinity |
|---|
| 60 | // |
|---|
| 61 | // finite, < -HALF_MAX -infinity |
|---|
| 62 | // |
|---|
| 63 | // NaN NaN |
|---|
| 64 | // |
|---|
| 65 | // +infinity +infinity |
|---|
| 66 | // |
|---|
| 67 | // -infinity -infinity |
|---|
| 68 | // |
|---|
| 69 | //--------------------------------------------------------- |
|---|
| 70 | |
|---|
| 71 | IMF_EXPORT half uintToHalf (unsigned int ui); |
|---|
| 72 | IMF_EXPORT half floatToHalf (float f); |
|---|
| 73 | |
|---|
| 74 | |
|---|
| 75 | OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT |
|---|
| 76 | |
|---|
| 77 | |
|---|
| 78 | #endif |
|---|
| 79 | |
|---|
