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/* See LICENSE file for copyright and license details. */
#include "ramps.h"
/**
* Test mapping function from [0, 1] float encoding value to [0, 2⁸ − 1] integer output value
*
* @param encoding [0, 1] float encoding value
* @return [0, 2⁸ − 1] integer output value
*/
uint8_t
invert_ramps8(float encoding)
{
double i_encoding = (double)(1.f - encoding);
double f_output = (double)UINT8_MAX * i_encoding;
uint8_t output = (uint8_t)f_output;
if (i_encoding < (double)0.25f && output > UINT8_MAX / 2)
output = 0;
if (i_encoding > (double)0.75f && output < UINT8_MAX / 2)
output = UINT8_MAX;
return output;
}
/**
* Test mapping function from [0, 1] float encoding value to [0, 2¹⁶ − 1] integer output value
*
* @param encoding [0, 1] float encoding value
* @return [0, 2¹⁶ − 1] integer output value
*/
uint16_t
invert_ramps16(float encoding)
{
double i_encoding = (double)(1.f - encoding);
double f_output = (double)UINT16_MAX * i_encoding;
uint16_t output = (uint16_t)f_output;
if (i_encoding < (double)0.25f && output > UINT16_MAX / 2)
output = 0;
if (i_encoding > (double)0.75f && output < UINT16_MAX / 2)
output = UINT16_MAX;
return output;
}
/**
* Test mapping function from [0, 1] float encoding value to [0, 2³² − 1] integer output value
*
* @param encoding [0, 1] float encoding value
* @return [0, 2³² − 1] integer output value
*/
uint32_t
invert_ramps32(float encoding)
{
double i_encoding = (double)(1.f - encoding);
double f_output = (double)UINT32_MAX * i_encoding;
uint32_t output = (uint32_t)f_output;
if (i_encoding < (double)0.25f && output > UINT32_MAX / 2)
output = 0;
if (i_encoding > (double)0.75f && output < UINT32_MAX / 2)
output = UINT32_MAX;
return output;
}
/**
* Test mapping function from [0, 1] float encoding value to [0, 2⁶⁴ − 1] integer output value
*
* @param encoding [0, 1] float encoding value
* @return [0, 2⁶⁴ − 1] integer output value
*/
uint64_t
invert_ramps64(float encoding)
{
double i_encoding = (double)(1.f - encoding);
double f_output = (double)UINT64_MAX * i_encoding;
uint64_t output = (uint64_t)f_output;
if (i_encoding < (double)0.25f && output > UINT64_MAX / 2)
output = 0;
if (i_encoding > (double)0.75f && output < UINT64_MAX / 2)
output = UINT64_MAX;
return output;
}
/**
* Test mapping function from [0, 1] float encoding value to [0, 1] float output value
*
* @param encoding [0, 1] float encoding value
* @return [0, 1] float output value
*/
float
invert_rampsf(float encoding)
{
return 1.f - encoding;
}
/**
* Test mapping function from [0, 1] double precision float encoding
* value to [0, 1] double precision float output value
*
* @param encoding [0, 1] float encoding value
* @return [0, 1] float output value
*/
double
invert_rampsd(double encoding)
{
return (double)1.f - encoding;
}
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