scale8.h File Reference

Detailed Description

Fast, efficient 8-bit scaling functions specifically designed for high-performance LED programming.

Definition in file scale8.h.

Go to the source code of this file.

Functions
LIB8STATIC_ALWAYS_INLINE uint8_t	scale8 (uint8_t i, fract8 scale)
	Scale one byte by a second one, which is treated as the numerator of a fraction whose denominator is 256.
LIB8STATIC_ALWAYS_INLINE uint8_t	scale8_video (uint8_t i, fract8 scale)
	The "video" version of scale8() guarantees that the output will be only be zero if one or both of the inputs are zero.
LIB8STATIC_ALWAYS_INLINE uint8_t	scale8_LEAVING_R1_DIRTY (uint8_t i, fract8 scale)
	This version of scale8() does not clean up the R1 register on AVR.
LIB8STATIC_ALWAYS_INLINE void	nscale8_LEAVING_R1_DIRTY (uint8_t &i, fract8 scale)
	In place modifying version of scale8() that does not clean up the R1 register on AVR.
LIB8STATIC_ALWAYS_INLINE uint8_t	scale8_video_LEAVING_R1_DIRTY (uint8_t i, fract8 scale)
	This version of scale8_video() does not clean up the R1 register on AVR.
LIB8STATIC_ALWAYS_INLINE void	nscale8_video_LEAVING_R1_DIRTY (uint8_t &i, fract8 scale)
	In place modifying version of scale8_video() that does not clean up the R1 register on AVR.
LIB8STATIC_ALWAYS_INLINE void	cleanup_R1 ()
	Clean up the r1 register after a series of *LEAVING_R1_DIRTY calls.
LIB8STATIC void	nscale8x3 (uint8_t &r, uint8_t &g, uint8_t &b, fract8 scale)
	Scale three one-byte values by a fourth one, which is treated as the numerator of a fraction whose demominator is 256.
LIB8STATIC void	nscale8x3_video (uint8_t &r, uint8_t &g, uint8_t &b, fract8 scale)
	Scale three one-byte values by a fourth one, which is treated as the numerator of a fraction whose demominator is 256.
LIB8STATIC void	nscale8x2 (uint8_t &i, uint8_t &j, fract8 scale)
	Scale two one-byte values by a third one, which is treated as the numerator of a fraction whose demominator is 256.
LIB8STATIC void	nscale8x2_video (uint8_t &i, uint8_t &j, fract8 scale)
	Scale two one-byte values by a third one, which is treated as the numerator of a fraction whose demominator is 256.
LIB8STATIC_ALWAYS_INLINE uint16_t	scale16by8 (uint16_t i, fract8 scale)
	Scale a 16-bit unsigned value by an 8-bit value, which is treated as the numerator of a fraction whose denominator is 256.
LIB8STATIC uint16_t	scale16 (uint16_t i, fract16 scale)
	Scale a 16-bit unsigned value by an 16-bit value, which is treated as the numerator of a fraction whose denominator is 65536.
LIB8STATIC uint8_t	dim8_raw (uint8_t x)
	Adjust a scaling value for dimming.
LIB8STATIC uint8_t	dim8_video (uint8_t x)
	Adjust a scaling value for dimming for video (value will never go below 1)
LIB8STATIC uint8_t	dim8_lin (uint8_t x)
	Linear version of the dimming function that halves for values < 128.
LIB8STATIC uint8_t	brighten8_raw (uint8_t x)
	Brighten a value (inverse of dim8_raw())
LIB8STATIC uint8_t	brighten8_video (uint8_t x)
	Brighten a value (inverse of dim8_video())
LIB8STATIC uint8_t	brighten8_lin (uint8_t x)
	Brighten a value (inverse of dim8_lin())