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Diffstat (limited to 'src/gamma-helper.c')
| -rw-r--r-- | src/gamma-helper.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/src/gamma-helper.c b/src/gamma-helper.c new file mode 100644 index 0000000..78a38fc --- /dev/null +++ b/src/gamma-helper.c @@ -0,0 +1,193 @@ +/** + * 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 + +/** + * 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 = ramps->ANY.red_size + ramps->ANY.green_size + ramps->ANY.blue_size; + size_t d, i; + int r, e; + libgamma_gamma_ramps_any_t ramps_sys; + uint64_t* ramps_full; + + switch (depth_system) + { + 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; + } + + ramps_sys.ANY. red_size = ramps->ANY. red_size; + ramps_sys.ANY.green_size = ramps->ANY.green_size; + 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)); + if (ramps_sys.ANY.red == NULL) + return LIBGAMMA_ERRNO_SET; + + if ((r = fun(this, &ramps_sys))) + { + e = errno; + free(ramps_sys.ANY.red); + return errno = e, r; + } + + ramps_full = malloc(n * sizeof(uint64_t)); + if (ramps_full) + { + e = errno; + free(ramps_sys.ANY.red); + return errno = e, r; + } + + switch (depth_system) + { + case 16: + for (i = 0; i < n; i++) + ramps_full[i] = (uint64_t)(ramps_sys.bits16.red[i]) * 0x0001000100010001ULL; + break; + + case 32: + for (i = 0; i < n; i++) + ramps_full[i] = (uint64_t)(ramps_sys.bits32.red[i]) * 0x0000000100000001ULL; + break; + + case 64: + for (i = 0; i < n; i++) + ramps_full[i] = ramps_sys.bits64.red[i]; + break; + + case -1: + for (i = 0; i < n; i++) + ramps_full[i] = (uint64_t)(ramps_sys.float_single.red[i] * (float)UINT64_MAX); + break; + + case -2: + for (i = 0; i < n; i++) + ramps_full[i] = (uint64_t)(ramps_sys.float_double.red[i] * (double)UINT64_MAX); + break; + + default: /* This is not possible. */ + abort(); + break; + } + + free(ramps_sys.ANY.red); + + if ((0 < depth_user) && (depth_user < 64)) + for (i = 0; i < n; i++) + { + ramps_full[i] >>= (64 - depth_user - 1); + ramps_full[i] = (ramps_full[i] & 1) | (ramps_full[i] >> 1); + } + + switch (depth_user) + { + case 16: + for (i = 0; i < n; i++) + ramps->bits16.red[i] = (uint16_t)(ramps_full[i]); + break; + + case 32: + for (i = 0; i < n; i++) + ramps->bits32.red[i] = (uint32_t)(ramps_full[i]); + break; + + case 64: + for (i = 0; i < n; i++) + ramps->bits64.red[i] = ramps_full[i]; + break; + + case -1: + for (i = 0; i < n; i++) + ramps->float_single.red[i] = (float)(ramps_full[i]) / (float)UINT64_MAX; + break; + + case -2: + for (i = 0; i < n; i++) + ramps->float_double.red[i] = (double)(ramps_full[i]) / (double)UINT64_MAX; + break; + + default: /* This is not possible. */ + abort(); + break; + } + + 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) +{ +} + +#undef ANY + |