diff options
Diffstat (limited to 'src/lib/gamma-helper.c')
| -rw-r--r-- | src/lib/gamma-helper.c | 537 |
1 files changed, 263 insertions, 274 deletions
diff --git a/src/lib/gamma-helper.c b/src/lib/gamma-helper.c index 3aafbb3..f67e107 100644 --- a/src/lib/gamma-helper.c +++ b/src/lib/gamma-helper.c @@ -1,20 +1,4 @@ -/** - * 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 "gamma-helper.h" #include "libgamma-method.h" @@ -26,85 +10,86 @@ /** - * Just an arbitrary version. + * Just an arbitrary version */ -#define ANY bits64 +#define ANY bits64 /** - * Concatenation of all ramps. + * Concatenation of all ramps */ #define ALL red /** * Preform installation in an `for (i = 0; i < n; i++)` - * loop and do a `break` afterwords. + * loop and do a `break` afterwords */ -#define __translate(instruction) for (i = 0; i < n; i++) instruction; break +#define __translate(instruction) for (i = 0; i < n; i++) instruction; break /** * Convert a [0, 1] `float` to a full range `uint64_t` * and mark sure rounding errors does not cause the - * value be 0 instead of ~0 and vice versa. + * value be 0 instead of ~0 and vice versa * - * @param value To `float` to convert. - * @return The value as an `uint64_t`. + * @param value To `float` to convert + * @return The value as an `uint64_t` */ -static inline uint64_t float_to_64(float value) +static inline uint64_t +float_to_64(float value) { - /* XXX Which is faster? */ + /* TODO Which is faster? */ #if defined(HAVE_INT128) && __WORDSIZE == 64 - /* `__int128` is a GNU C extension, which - (because it is not ISO C) emits a warning - under -pedantic. */ + /* `__int128` is a GNU C extension, which + (because it is not ISO C) emits a warning + under -pedantic */ # pragma GCC diagnostic push # pragma GCC diagnostic ignored "-Wpedantic" - - /* In GCC we can use `__int128`, this is - a signed 128-bit integer. It fits all - uint64_t values but also native values, - which is a nice because it eleminates - some overflow condition tests. It is - also more readable. */ - - /* Convert to integer. */ - __int128 product = (__int128)(value * (float)UINT64_MAX); - /* Negative overflow. */ - if (product > UINT64_MAX) - return UINT64_MAX; - /* Positive overflow. */ - if (product < 0) - return 0; - /* Did not overflow. */ - return (uint64_t)product; - + + /* In GCC we can use `__int128`, this is + a signed 128-bit integer. It fits all + uint64_t values but also native values, + which is a nice because it eleminates + some overflow condition tests. It is + also more readable. */ + + /* Convert to integer */ + __int128 product = (__int128)(value * (float)UINT64_MAX); + /* Negative overflow */ + if (product > UINT64_MAX) + return UINT64_MAX; + /* Positive overflow */ + if (product < 0) + return 0; + /* Did not overflow */ + return (uint64_t)product; + # pragma GCC diagnostic pop #else + + /* If we are not using GCC we cannot be + sure that we have `__int128` so we have + to use `uint64_t` and perform overflow + checkes based on the input value */ - /* If we are not using GCC we cannot be - sure that we have `__int128` so we have - to use `uint64_t` and perform overflow - checkes based on the input value. */ - - /* Convert to integer. */ - uint64_t product = (uint64_t)(value * (float)UINT64_MAX); - /* Negative overflow, - if the input is less than 0,5 but - the output is greater then we got - -1 when we should have gotten 0. */ - if ((value < 0.1f) && (product > 0xF000000000000000ULL)) - return 0; - /* Positive overflow, - if the input is greater than 0,5 - but the output is less then we got - 0 when we should have gotten ~0. */ - else if ((value > 0.9f) && (product < 0x1000000000000000ULL)) - return (uint64_t)~0; - /* Did not overflow. */ - return product; - + /* Convert to integer. */ + uint64_t product = (uint64_t)(value * (float)UINT64_MAX); + /* Negative overflow, + if the input is less than 0.5 but + the output is greater then we got + -1 when we should have gotten 0 */ + if (value < 0.1f && product > 0xF000000000000000ULL) + return 0; + /* Positive overflow, + if the input is greater than 0.5 + but the output is less then we got + 0 when we should have gotten ~0 */ + else if (value > 0.9f && product < 0x1000000000000000ULL) + return (uint64_t)~0; + /* Did not overflow */ + return product; + #endif } @@ -112,272 +97,276 @@ static inline uint64_t float_to_64(float value) /** * Convert a [0, 1] `double` to a full range `uint64_t` * and mark sure rounding errors does not cause the - * value be 0 instead of ~0 and vice versa. + * value be 0 instead of ~0 and vice versa * - * @param value To `double` to convert. - * @return The value as an `uint64_t`. + * @param value To `double` to convert + * @return The value as an `uint64_t` */ -static inline uint64_t double_to_64(double value) +static inline uint64_t +double_to_64(double value) { - /* XXX Which is faster? */ - + /* XXX Which is faster? */ + #if defined(HAVE_INT128) && __WORDSIZE == 64 - /* `__int128` is a GNU C extension, which - (because it is not ISO C) emits a warning - under -pedantic. */ + /* `__int128` is a GNU C extension, which + (because it is not ISO C) emits a warning + under -pedantic */ # pragma GCC diagnostic push # pragma GCC diagnostic ignored "-Wpedantic" - - /* In GCC we can use `__int128`, this is - a signed 128-bit integer. It fits all - uint64_t values but also native values, - which is a nice because it eleminates - some overflow condition tests. It is - also more readable. */ - - /* Convert to integer. */ - __int128 product = (__int128)(value * (double)UINT64_MAX); - /* Negative overflow. */ - if (product > UINT64_MAX) - return UINT64_MAX; - /* Positive overflow. */ - if (product < 0) - return 0; - /* Did not overflow. */ - return (uint64_t)product; - + + /* In GCC we can use `__int128`, this is + a signed 128-bit integer. It fits all + uint64_t values but also native values, + which is a nice because it eleminates + some overflow condition tests. It is + also more readable. */ + + /* Convert to integer */ + __int128 product = (__int128)(value * (double)UINT64_MAX); + /* Negative overflow */ + if (product > UINT64_MAX) + return UINT64_MAX; + /* Positive overflow */ + if (product < 0) + return 0; + /* Did not overflow */ + return (uint64_t)product; + # pragma GCC diagnostic pop #else - - /* If we are not using GCC we cannot be - sure that we have `__int128` so we have - to use `uint64_t` and perform overflow - checkes based on the input value. */ - - /* Convert to integer. */ - uint64_t product = (uint64_t)(value * (double)UINT64_MAX); - /* Negative overflow, - if the input is less than 0,5 but - the output is greater then we got - -1 when we should have gotten 0. */ - if ((value < (double)0.1f) && (product > 0xF000000000000000ULL)) - product = 0; - /* Positive overflow. - if the input is greater than 0,5 - but the output is less then we got - 0 when we should have gotten ~0. */ - else if ((value > (double)0.9f) && (product < 0x1000000000000000ULL)) - product = (uint64_t)~0; - /* Did not overflow. */ - return product; - + + /* If we are not using GCC we cannot be + sure that we have `__int128` so we have + to use `uint64_t` and perform overflow + checkes based on the input value. */ + + /* Convert to integer. */ + uint64_t product = (uint64_t)(value * (double)UINT64_MAX); + /* Negative overflow, + if the input is less than 0.5 but + the output is greater then we got + -1 when we should have gotten 0 */ + if (value < (double)0.1f && product > 0xF000000000000000ULL) + product = 0; + /* Positive overflow, + if the input is greater than 0.5 + but the output is less then we got + 0 when we should have gotten ~0 */ + else if ((value > (double)0.9f) && (product < 0x1000000000000000ULL)) + product = (uint64_t)~0; + /* Did not overflow */ + return product; + #endif } /** - * Convert any set of gamma ramps into a 64-bit integer array with all channels. + * 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. + * @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) +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) - { - /* Translate integer. */ - case 8: __translate(out[i] = (uint64_t)(in.bits8. ALL[i]) * 0x0101010101010101ULL); - case 16: __translate(out[i] = (uint64_t)(in.bits16.ALL[i]) * 0x0001000100010001ULL); - case 32: __translate(out[i] = (uint64_t)(in.bits32.ALL[i]) * 0x0000000100000001ULL); - /* Identity translation. */ - case 64: __translate(out[i] = in.bits64.ALL[i]); - /* Translate floating point. */ - case -1: __translate(out[i] = float_to_64(in.float_single.ALL[i])); - case -2: __translate(out[i] = double_to_64(in.float_double.ALL[i])); - default: - /* This is not possible. */ - abort(); - break; - } + size_t i; + switch (depth) { + /* Translate integer */ + case 8: __translate(out[i] = (uint64_t)(in.bits8. ALL[i]) * 0x0101010101010101ULL); + case 16: __translate(out[i] = (uint64_t)(in.bits16.ALL[i]) * 0x0001000100010001ULL); + case 32: __translate(out[i] = (uint64_t)(in.bits32.ALL[i]) * 0x0000000100000001ULL); + /* Identity translation */ + case 64: __translate(out[i] = in.bits64.ALL[i]); + /* Translate floating point */ + case -1: __translate(out[i] = float_to_64(in.float_single.ALL[i])); + case -2: __translate(out[i] = double_to_64(in.float_double.ALL[i])); + default: + /* This is not possible */ + abort(); + break; + } } /** - * Undo the actions of `translate_to_64`. + * 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. + * @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) +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) - { - /* 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; - } + 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; + } } /** - * Allocate and initalise a gamma ramp with any depth. + * 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 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. + * `-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. + * 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) +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) { - /* Calculate the size of the allocation to do. */ - size_t d, n = ramps.ANY.red_size + ramps.ANY.green_size + ramps.ANY.blue_size; - switch (depth) - { - case 8: d = sizeof(uint8_t); break; - 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; - } - - /* Copy the gamma ramp sizes. */ - ramps_sys->ANY = ramps.ANY; - /* Allocate the new ramps. */ + /* Calculate the size of the allocation to do */ + size_t d, n = ramps.ANY.red_size + ramps.ANY.green_size + ramps.ANY.blue_size; + switch (depth) { + case 8: d = sizeof(uint8_t); break; + 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; + } + + /* Copy the gamma ramp sizes */ + ramps_sys->ANY = ramps.ANY; + /* Allocate the new ramps */ #ifdef HAVE_LIBGAMMA_METHOD_LINUX_DRM - /* Valgrind complains about us reading uninitialize memory if we just use malloc. */ - ramps_sys->ANY.red = calloc(n, d); + /* Valgrind complains about us reading uninitialize memory if we just use malloc */ + ramps_sys->ANY.red = calloc(n, d); #else - ramps_sys->ANY.red = malloc(n * d); + ramps_sys->ANY.red = malloc(n * d); #endif - 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)); - - /* Report the total gamma ramp size. */ - *elements = n; - /* Report successfulness. */ - return ramps_sys->ANY.red == NULL ? LIBGAMMA_ERRNO_SET : 0; + 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)]; + + /* Report the total gamma ramp size */ + *elements = n; + /* Report successfulness */ + return ramps_sys->ANY.red ? 0 : LIBGAMMA_ERRNO_SET; } /** - * Get the current gamma ramps for a CRTC, re-encoding version. + * Get the current 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 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`. + * `-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`. + * `-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. + * and the return value too is identical * @return Zero on success, otherwise (negative) the value of an - * error identifier provided by this library. + * 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) +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; + size_t n; + int r; + libgamma_gamma_ramps_any_t ramps_sys; + uint64_t *restrict ramps_full; - /* Allocate ramps with proper data type. */ - if ((r = allocated_any_ramp(&ramps_sys, *ramps, depth_system, &n))) - return r; - - /* Fill the ramps. */ - if ((r = fun(this, &ramps_sys))) - return free(ramps_sys.ANY.red), r; - - /* Allocate intermediary ramps. */ - if ((ramps_full = malloc(n * sizeof(uint64_t))) == NULL) - return free(ramps_sys.ANY.red), LIBGAMMA_ERRNO_SET; - - /* Translate ramps to 64-bit integers. */ - translate_to_64(depth_system, n, ramps_full, ramps_sys); - free(ramps_sys.ANY.red); - - /* Translate ramps to the user's format. */ - translate_from_64(depth_user, n, *ramps, ramps_full); - free(ramps_full); - return 0; + /* Allocate ramps with proper data type */ + if ((r = allocated_any_ramp(&ramps_sys, *ramps, depth_system, &n))) + return r; + + /* Fill the ramps */ + if ((r = fun(this, &ramps_sys))) + return free(ramps_sys.ANY.red), r; + + /* Allocate intermediary ramps */ + ramps_full = malloc(n * sizeof(uint64_t)); + if (!ramps_full) { + free(ramps_sys.ANY.red); + return LIBGAMMA_ERRNO_SET; + } + + /* Translate ramps to 64-bit integers */ + translate_to_64(depth_system, n, ramps_full, ramps_sys); + free(ramps_sys.ANY.red); + + /* Translate ramps to the user's format */ + translate_from_64(depth_user, n, *ramps, ramps_full); + free(ramps_full); + return 0; } /** - * Set the gamma ramps for a CRTC, re-encoding version. + * Set the gamma ramps for a CRTC, re-encoding version * - * @param this The CRTC state. - * @param ramps The gamma ramps to apply. + * @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`. + * `-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`. + * `-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. + * and the return value too is identical * @return Zero on success, otherwise (negative) the value of an - * error identifier provided by this library. + * 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) +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; - - /* Allocate ramps with proper data type. */ - if ((r = allocated_any_ramp(&ramps_sys, ramps, depth_system, &n))) - return r; - - /* Allocate intermediary ramps. */ - if ((ramps_full = malloc(n * sizeof(uint64_t))) == NULL) - return free(ramps_sys.ANY.red), LIBGAMMA_ERRNO_SET; - - /* Translate ramps to 64-bit integers. */ - translate_to_64(depth_user, n, ramps_full, ramps); - /* Translate ramps to the proper format. */ - translate_from_64(depth_system, n, ramps_sys, ramps_full); - free(ramps_full); - - /* Apply the ramps */ - r = fun(this, ramps_sys); - - free(ramps_sys.ANY.red); - return r; + size_t n; + int r; + libgamma_gamma_ramps_any_t ramps_sys; + uint64_t *restrict ramps_full; + + /* Allocate ramps with proper data type */ + if ((r = allocated_any_ramp(&ramps_sys, ramps, depth_system, &n))) + return r; + + /* Allocate intermediary ramps */ + ramps_full = malloc(n * sizeof(uint64_t)); + if (!ramps_full) { + free(ramps_sys.ANY.red); + return LIBGAMMA_ERRNO_SET; + } + + /* Translate ramps to 64-bit integers. */ + translate_to_64(depth_user, n, ramps_full, ramps); + /* Translate ramps to the proper format. */ + translate_from_64(depth_system, n, ramps_sys, ramps_full); + free(ramps_full); + + /* Apply the ramps */ + r = fun(this, ramps_sys); + + free(ramps_sys.ANY.red); + return r; } #undef __translate #undef ALL #undef ANY - |