diff options
Diffstat (limited to 'src/test/ramps.c')
| -rw-r--r-- | src/test/ramps.c | 141 |
1 files changed, 65 insertions, 76 deletions
diff --git a/src/test/ramps.c b/src/test/ramps.c index ee3aa7d..5303195 100644 --- a/src/test/ramps.c +++ b/src/test/ramps.c @@ -1,115 +1,104 @@ -/** - * libgamma -- Display server abstraction layer for gamma ramp adjustments - * Copyright (C) 2014, 2015 Mattias Andrée (maandree@member.fsf.org) - * - * This library is free software: you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation, either version 3 of the License, or - * (at your option) any later version. - * - * This library is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this library. If not, see <http://www.gnu.org/licenses/>. - */ +/* 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. + * 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. + * @param encoding [0, 1] float encoding value + * @return [0, 2⁸ − 1] integer output value */ -uint8_t invert_ramps8(float encoding) +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; + 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. + * 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. + * @param encoding [0, 1] float encoding value + * @return [0, 2¹⁶ − 1] integer output value */ -uint16_t invert_ramps16(float encoding) +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; + 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. + * 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. + * @param encoding [0, 1] float encoding value + * @return [0, 2³² − 1] integer output value */ -uint32_t invert_ramps32(float encoding) +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; + 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. + * 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. + * @param encoding [0, 1] float encoding value + * @return [0, 2⁶⁴ − 1] integer output value */ -uint64_t invert_ramps64(float encoding) +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; + 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. + * 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. + * @param encoding [0, 1] float encoding value + * @return [0, 1] float output value */ -float invert_rampsf(float encoding) +float +invert_rampsf(float encoding) { - return 1.f - encoding; + return 1.f - encoding; } /** * Test mapping function from [0, 1] double precision float encoding - * value to [0, 1] double precision float output value. + * value to [0, 1] double precision float output value * - * @param encoding [0, 1] float encoding value. - * @return [0, 1] float output value. + * @param encoding [0, 1] float encoding value + * @return [0, 1] float output value */ -double invert_rampsd(double encoding) +double +invert_rampsd(double encoding) { - return ((double)1.f) - encoding; + return (double)1.f - encoding; } - |