ease8InOutCubic()

LIB8STATIC fract8 ease8InOutCubic

(

fract8

i

)

8-bit cubic ease-in / ease-out function.

Takes around 18 cycles on AVR.

Definition at line 624 of file lib8tion.h.

{
    uint8_t ii  = scale8_LEAVING_R1_DIRTY(  i, i);
    uint8_t iii = scale8_LEAVING_R1_DIRTY( ii, i);
 
    uint16_t r1 = (3 * (uint16_t)(ii)) - ( 2 * (uint16_t)(iii));
 
    /* the code generated for the above *'s automatically
       cleans up R1, so there's no need to explicitily call
       cleanup_R1(); */
 
    uint8_t result = r1;
 
    // if we got "256", return 255:
    if( r1 & 0x100 ) {
        result = 255;
    }
    return result;
}

References LIB8STATIC, and scale8_LEAVING_R1_DIRTY().

Referenced by cubicwave8().

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