diff options
author | Campbell Barton <ideasman42@gmail.com> | 2017-09-18 14:03:10 +0300 |
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committer | Campbell Barton <ideasman42@gmail.com> | 2017-09-18 16:55:41 +0300 |
commit | c4fc9c4a8ecc421fdbf1f5d06d3b67ac4c8c1895 (patch) | |
tree | 448296ec632d616303dc9385654d4da135cda497 /source/blender/blenlib | |
parent | a6b156bf57864072aa2cab8b251a8fb3b0ee7b34 (diff) |
Math Lib: clamped rounding utility functions
Diffstat (limited to 'source/blender/blenlib')
-rw-r--r-- | source/blender/blenlib/BLI_math_base.h | 14 | ||||
-rw-r--r-- | source/blender/blenlib/intern/math_base_inline.c | 34 |
2 files changed, 48 insertions, 0 deletions
diff --git a/source/blender/blenlib/BLI_math_base.h b/source/blender/blenlib/BLI_math_base.h index c44b666faea..e7e89a6424a 100644 --- a/source/blender/blenlib/BLI_math_base.h +++ b/source/blender/blenlib/BLI_math_base.h @@ -153,6 +153,20 @@ MINLINE int iroundf(float a); MINLINE int divide_round_i(int a, int b); MINLINE int mod_i(int i, int n); +MINLINE signed char round_fl_to_char_clamp(float a); +MINLINE unsigned char round_fl_to_uchar_clamp(float a); +MINLINE short round_fl_to_short_clamp(float a); +MINLINE unsigned short round_fl_to_ushort_clamp(float a); +MINLINE int round_fl_to_int_clamp(float a); +MINLINE unsigned int round_fl_to_uint_clamp(float a); + +MINLINE signed char round_db_to_char_clamp(double a); +MINLINE unsigned char round_db_to_uchar_clamp(double a); +MINLINE short round_db_to_short_clamp(double a); +MINLINE unsigned short round_db_to_ushort_clamp(double a); +MINLINE int round_db_to_int_clamp(double a); +MINLINE unsigned int round_db_to_uint_clamp(double a); + int pow_i(int base, int exp); double double_round(double x, int ndigits); diff --git a/source/blender/blenlib/intern/math_base_inline.c b/source/blender/blenlib/intern/math_base_inline.c index 5ae2b1a70a7..37efe95791c 100644 --- a/source/blender/blenlib/intern/math_base_inline.c +++ b/source/blender/blenlib/intern/math_base_inline.c @@ -33,6 +33,7 @@ #include <float.h> #include <stdio.h> #include <stdlib.h> +#include <limits.h> #ifdef __SSE2__ # include <emmintrin.h> @@ -181,11 +182,44 @@ MINLINE unsigned power_of_2_min_u(unsigned x) return x - (x >> 1); } +/* rounding and clamping */ + MINLINE int iroundf(float a) { return (int)floorf(a + 0.5f); } +#define _round_clamp_fl_impl(arg, ty, min, max) { \ + float r = floorf(arg + 0.5f); \ + if (UNLIKELY(r <= (float)min)) return (ty)min; \ + else if (UNLIKELY(r >= (float)max)) return (ty)max; \ + else return (ty)r; \ +} + +#define _round_clamp_db_impl(arg, ty, min, max) { \ + double r = floor(arg + 0.5); \ + if (UNLIKELY(r <= (double)min)) return (ty)min; \ + else if (UNLIKELY(r >= (double)max)) return (ty)max; \ + else return (ty)r; \ +} + +MINLINE signed char round_fl_to_char_clamp(float a) { _round_clamp_fl_impl(a, signed char, SCHAR_MIN, SCHAR_MAX) } +MINLINE unsigned char round_fl_to_uchar_clamp(float a) { _round_clamp_fl_impl(a, unsigned char, 0, UCHAR_MAX) } +MINLINE short round_fl_to_short_clamp(float a) { _round_clamp_fl_impl(a, short, SHRT_MIN, SHRT_MAX) } +MINLINE unsigned short round_fl_to_ushort_clamp(float a) { _round_clamp_fl_impl(a, unsigned short, 0, USHRT_MAX) } +MINLINE int round_fl_to_int_clamp(float a) { _round_clamp_fl_impl(a, int, INT_MIN, INT_MAX) } +MINLINE unsigned int round_fl_to_uint_clamp(float a) { _round_clamp_fl_impl(a, unsigned int, 0, UINT_MAX) } + +MINLINE signed char round_db_to_char_clamp(double a) { _round_clamp_db_impl(a, signed char, SCHAR_MIN, SCHAR_MAX) } +MINLINE unsigned char round_db_to_uchar_clamp(double a) { _round_clamp_db_impl(a, unsigned char, 0, UCHAR_MAX) } +MINLINE short round_db_to_short_clamp(double a) { _round_clamp_db_impl(a, short, SHRT_MIN, SHRT_MAX) } +MINLINE unsigned short round_db_to_ushort_clamp(double a) { _round_clamp_db_impl(a, unsigned short, 0, USHRT_MAX) } +MINLINE int round_db_to_int_clamp(double a) { _round_clamp_db_impl(a, int, INT_MIN, INT_MAX) } +MINLINE unsigned int round_db_to_uint_clamp(double a) { _round_clamp_db_impl(a, unsigned int, 0, UINT_MAX) } + +#undef _round_clamp_fl_impl +#undef _round_clamp_db_impl + /* integer division that rounds 0.5 up, particularly useful for color blending * with integers, to avoid gradual darkening when rounding down */ MINLINE int divide_round_i(int a, int b) |