A Survey of Gaussian Convolution Algorithms
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basic.h
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#ifndef _BASIC_H_
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#define _BASIC_H_
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#include <math.h>
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#include <stdlib.h>
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/* Portable integer types */
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#if defined(WIN32) || defined(_WIN32) || defined(WIN64) || defined(_WIN64)
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/* Windows system: Use __intN types to define uint8_t, etc. */
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typedef
unsigned
__int8 uint8_t;
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typedef
unsigned
__int16 uint16_t;
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typedef
unsigned
__int32 uint32_t;
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typedef
__int8 int8_t;
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typedef
__int16 int16_t;
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typedef
__int32 int32_t;
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#else
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/* UNIX system: Use stdint to define uint8_t, etc. */
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#include <stdint.h>
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#endif
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/* Math constants (Hart & Cheney) */
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#ifndef M_2PI
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#define M_2PI 6.28318530717958647692528676655900576
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#endif
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#ifndef M_PI
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#define M_PI 3.14159265358979323846264338327950288
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#endif
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#ifndef M_PI_2
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#define M_PI_2 1.57079632679489661923132169163975144
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#endif
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#ifndef M_PI_4
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#define M_PI_4 0.78539816339744830961566084581987572
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#endif
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#ifndef M_PI_8
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#define M_PI_8 0.39269908169872415480783042290993786
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#endif
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#ifndef M_SQRT2
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#define M_SQRT2 1.41421356237309504880168872420969808
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#endif
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#ifndef M_1_SQRT2
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#define M_1_SQRT2 0.70710678118654752440084436210484904
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#endif
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#ifndef M_E
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#define M_E 2.71828182845904523536028747135266250
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#endif
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#ifndef M_LOG2E
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#define M_LOG2E 1.44269504088896340735992468100189213
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#endif
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#ifndef M_LOG10E
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#define M_LOG10E 0.43429448190325182765112891891660508
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#endif
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#ifndef M_LN2
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#define M_LN2 0.69314718055994530941723212145817657
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#endif
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#ifndef M_LN10
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#define M_LN10 2.30258509299404568401799145468436421
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#endif
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#ifndef M_EULER
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#define M_EULER 0.57721566490153286060651209008240243
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#endif
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#ifndef M_SQRT2PI
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#define M_SQRT2PI 2.50662827463100050241576528481104525
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#endif
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#define ROUND(X) (floor((X) + 0.5))
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#define ROUNDF(X) (floor((X) + 0.5f))
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#ifdef __GNUC__
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#ifndef ATTRIBUTE_UNUSED
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#define ATTRIBUTE_UNUSED __attribute__((unused))
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#endif
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#ifndef ATTRIBUTE_ALWAYSINLINE
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#define ATTRIBUTE_ALWAYSINLINE __attribute__((always_inline))
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#endif
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#else
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#define ATTRIBUTE_UNUSED
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#define ATTRIBUTE_ALWAYSINLINE
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#endif
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unsigned
long
millisecond_timer
();
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#endif
/* _BASIC_H_ */
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