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Diffstat (limited to 'src/lib/gamma-helper.c')
| -rw-r--r-- | src/lib/gamma-helper.c | 258 |
1 files changed, 258 insertions, 0 deletions
diff --git a/src/lib/gamma-helper.c b/src/lib/gamma-helper.c new file mode 100644 index 0000000..dd4e027 --- /dev/null +++ b/src/lib/gamma-helper.c @@ -0,0 +1,258 @@ +/** + * libgamma — Display server abstraction layer for gamma ramp adjustments + * Copyright © 2014 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/>. + */ +#include "gamma-helper.h" + +#include "libgamma-method.h" +#include "libgamma-error.h" + +#include <errno.h> +#include <stdlib.h> +#include <stdint.h> + + +#define ANY bits64 + + +/** + * Convert any set of gamma ramps into a 64-bit integer array with all channels. + * + * @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 array. + * @param in Input gamma ramps. + */ +static void translate_to_64(signed depth, size_t n, uint64_t* restrict out, libgamma_gamma_ramps_any_t in) +{ + size_t i; + switch (depth) + { + case 16: + for (i = 0; i < n; i++) + out[i] = (uint64_t)(in.bits16.red[i]) * 0x0001000100010001ULL; + break; + + case 32: + for (i = 0; i < n; i++) + out[i] = (uint64_t)(in.bits32.red[i]) * 0x0000000100000001ULL; + break; + + case 64: + for (i = 0; i < n; i++) + out[i] = in.bits64.red[i]; + break; + + case -1: + for (i = 0; i < n; i++) + out[i] = (uint64_t)(in.float_single.red[i] * (float)UINT64_MAX); + break; + + case -2: + for (i = 0; i < n; i++) + out[i] = (uint64_t)(in.float_double.red[i] * (double)UINT64_MAX); + break; + + default: /* This is not possible. */ + abort(); + break; + } +} + + +/** + * Undo the actions of `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. + */ +static void translate_from_64(signed depth, size_t n, libgamma_gamma_ramps_any_t out, uint64_t* restrict in) +{ + size_t i; + + switch (depth) + { + case 16: + for (i = 0; i < n; i++) + out.bits16.red[i] = (uint16_t)(in[i] / 0x0001000100010001ULL); + break; + + case 32: + for (i = 0; i < n; i++) + out.bits32.red[i] = (uint32_t)(in[i] / 0x0000000100000001ULL); + break; + + case 64: + for (i = 0; i < n; i++) + out.bits64.red[i] = in[i]; + break; + + case -1: + for (i = 0; i < n; i++) + out.float_single.red[i] = (float)(in[i]) / (float)UINT64_MAX; + break; + + case -2: + for (i = 0; i < n; i++) + out.float_double.red[i] = (double)(in[i]) / (double)UINT64_MAX; + break; + + default: /* This is not possible. */ + abort(); + break; + } +} + + +/** + * Allocate and initalise a gamma ramp with any depth. + * + * @param ramps_sys Output gamma ramps. + * @param ramps The gamma ramps whose sizes should be duplicated. + * @param depth The depth of the gamma ramps to allocate, + * `-1` for `float`, `-2` for `double`. + * @param elements Output reference for the grand size of the gamma ramps. + * @return Zero on success, otherwise (negative) the value of an + * error identifier provided by this library. + */ +static int allocated_any_ramp(libgamma_gamma_ramps_any_t* restrict ramps_sys, + libgamma_gamma_ramps_any_t ramps, signed depth, size_t* restrict elements) +{ + size_t n = 0; + size_t d; + + switch (depth) + { + case 16: d = sizeof(uint16_t); break; + case 32: d = sizeof(uint32_t); break; + case 64: d = sizeof(uint64_t); break; + case -1: d = sizeof(float); break; + case -2: d = sizeof(double); break; + default: + return errno = EINVAL, LIBGAMMA_ERRNO_SET; + } + + n += ramps_sys->ANY. red_size = ramps.ANY. red_size; + n += ramps_sys->ANY.green_size = ramps.ANY.green_size; + n += ramps_sys->ANY. blue_size = ramps.ANY. blue_size; + + ramps_sys->ANY.red = malloc(n * d); + ramps_sys->ANY.green = (void*)(((char*)(ramps_sys->ANY. red)) + ramps.ANY. red_size * d / sizeof(char)); + ramps_sys->ANY.blue = (void*)(((char*)(ramps_sys->ANY.green)) + ramps.ANY.green_size * d / sizeof(char)); + + *elements = n; + return ramps_sys->ANY.red ? 0 : LIBGAMMA_ERRNO_SET; +} + + +/** + * Get current the gamma ramps for a CRTC, re-encoding version. + * + * @param this The CRTC state. + * @param ramps The gamma ramps to fill with the current values. + * @param depth_user The depth of the gamma ramps that are provided by the user, + * `-1` for `float`, `-2` for `double`. + * @param depth_system The depth of the gamma ramps as required by the adjustment method, + * `-1` for `float`, `-2` for `double`. + * @param fun Function that is to be used read the ramps, its parameters have + * the same function as those of this function with the same names, + * and the return value too is identical. + * @return Zero on success, otherwise (negative) the value of an + * error identifier provided by this library. + */ +int libgamma_translated_ramp_get_(libgamma_crtc_state_t* restrict this, + libgamma_gamma_ramps_any_t* restrict ramps, + signed depth_user, signed depth_system, + libgamma_get_ramps_any_fun* fun) +{ + size_t n; + int r; + libgamma_gamma_ramps_any_t ramps_sys; + uint64_t* restrict ramps_full; + + if ((r = allocated_any_ramp(&ramps_sys, *ramps, depth_system, &n))) + return r; + + if ((r = fun(this, &ramps_sys))) + { + free(ramps_sys.ANY.red); + return r; + } + + if ((ramps_full = malloc(n * sizeof(uint64_t))) == NULL) + { + free(ramps_sys.ANY.red); + return LIBGAMMA_ERRNO_SET; + } + + translate_to_64(depth_system, n, ramps_full, ramps_sys); + free(ramps_sys.ANY.red); + + translate_from_64(depth_user, n, *ramps, ramps_full); + free(ramps_full); + return 0; +} + + +/** + * Set the gamma ramps for a CRTC, re-encoding version. + * + * @param this The CRTC state. + * @param ramps The gamma ramps to apply. + * @param depth_user The depth of the gamma ramps that are provided by the user, + * `-1` for `float`, `-2` for `double`. + * @param depth_system The depth of the gamma ramps as required by the adjustment method, + * `-1` for `float`, `-2` for `double`. + * @param fun Function that is to be used write the ramps, its parameters have + * the same function as those of this function with the same names, + * and the return value too is identical. + * @return Zero on success, otherwise (negative) the value of an + * error identifier provided by this library. + */ +int libgamma_translated_ramp_set_(libgamma_crtc_state_t* restrict this, + libgamma_gamma_ramps_any_t ramps, + signed depth_user, signed depth_system, + libgamma_set_ramps_any_fun* fun) +{ + size_t n; + int r; + libgamma_gamma_ramps_any_t ramps_sys; + uint64_t* restrict ramps_full; + + if ((r = allocated_any_ramp(&ramps_sys, ramps, depth_system, &n))) + return r; + + if ((ramps_full = malloc(n * sizeof(uint64_t))) == NULL) + { + free(ramps_sys.ANY.red); + return LIBGAMMA_ERRNO_SET; + } + + translate_to_64(depth_user, n, ramps_full, ramps); + translate_from_64(depth_system, n, ramps_sys, ramps_full); + free(ramps_full); + + r = fun(this, ramps_sys); + + free(ramps_sys.ANY.red); + return r; +} + + +#undef ANY + |