diff options
Diffstat (limited to 'libgamma_internal_translate_from_64.c')
| -rw-r--r-- | libgamma_internal_translate_from_64.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/libgamma_internal_translate_from_64.c b/libgamma_internal_translate_from_64.c new file mode 100644 index 0000000..b8adbfe --- /dev/null +++ b/libgamma_internal_translate_from_64.c @@ -0,0 +1,44 @@ +/* See LICENSE file for copyright and license details. */ +#include "common.h" + + +/** + * Concatenation of all ramps + */ +#define ALL red + +/** + * Preform installation in an `for (i = 0; i < n; i++)` + * loop and do a `break` afterwords + */ +#define __translate(instruction) for (i = 0; i < n; i++) instruction; break + + +/** + * Undo the actions of `libgamma_internal_translate_to_64` + * + * @param depth The depth of the gamma ramp, `-1` for `float`, `-2` for `double` + * @param n The grand size of gamma ramps (sum of all channels' sizes) + * @param out Output gamma ramps + * @param in Input array, may be modified + */ +void +libgamma_internal_translate_from_64(signed depth, size_t n, gamma_ramps_any_t out, uint64_t *restrict in) +{ + size_t i; + switch (depth) { + /* Translate integer */ + case 8: __translate(out.bits8. ALL[i] = (uint8_t)(in[i] / 0x0101010101010101ULL)); + case 16: __translate(out.bits16.ALL[i] = (uint16_t)(in[i] / 0x0001000100010001ULL)); + case 32: __translate(out.bits32.ALL[i] = (uint32_t)(in[i] / 0x0000000100000001ULL)); + /* Identity translation */ + case 64: __translate(out.bits64.ALL[i] = in[i]); + /* Translate floating point */ + case -1: __translate(out.float_single.ALL[i] = (float)(in[i]) / (float)UINT64_MAX); + case -2: __translate(out.float_double.ALL[i] = (double)(in[i]) / (double)UINT64_MAX); + default: + /* This is not possible */ + abort(); + break; + } +} |