diff options
Diffstat (limited to 'src/lib/gamma-x-randr.c')
| -rw-r--r-- | src/lib/gamma-x-randr.c | 1519 |
1 files changed, 761 insertions, 758 deletions
diff --git a/src/lib/gamma-x-randr.c b/src/lib/gamma-x-randr.c index fb002fc..fce65d1 100644 --- a/src/lib/gamma-x-randr.c +++ b/src/lib/gamma-x-randr.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. */ #ifndef HAVE_LIBGAMMA_METHOD_X_RANDR # error Compiling gamma-x-randr.c without HAVE_LIBGAMMA_METHOD_X_RANDR #endif @@ -37,143 +21,144 @@ /** - * The major version of RandR the library expects. + * The major version of RandR the library expects */ #define RANDR_VERSION_MAJOR 1 /** - * The minor version of RandR the library expects. + * The minor version of RandR the library expects */ #define RANDR_VERSION_MINOR 3 /** - * Data structure for partition data. + * Data structure for partition data */ -typedef struct libgamma_x_randr_partition_data -{ - /** - * Mapping from CRTC indices to CRTC identifiers. - */ - xcb_randr_crtc_t* crtcs; - - /** - * Mapping from output indices to output identifiers. - */ - xcb_randr_output_t* outputs; - - /** - * The number of outputs available. - */ - size_t outputs_count; - - /** - * Mapping from CRTC indices to output indices. - * CRTC's without an output (should be impossible) - * have the value `SIZE_MAX` which is impossible - * for an existing mapping. - */ - size_t* crtc_to_output; - - /** - * Screen configuration timestamp. - */ - xcb_timestamp_t config_timestamp; - +typedef struct libgamma_x_randr_partition_data { + /** + * Mapping from CRTC indices to CRTC identifiers + */ + xcb_randr_crtc_t *crtcs; + + /** + * Mapping from output indices to output identifiers + */ + xcb_randr_output_t *outputs; + + /** + * The number of outputs available + */ + size_t outputs_count; + + /** + * Mapping from CRTC indices to output indices. + * CRTC's without an output (should be impossible) + * have the value `SIZE_MAX` which is impossible + * for an existing mapping + */ + size_t *crtc_to_output; + + /** + * Screen configuration timestamp + */ + xcb_timestamp_t config_timestamp; + } libgamma_x_randr_partition_data_t; /** - * Translate an xcb error into a libgamma error. + * Translate an xcb error into a libgamma error * - * @param error_code The xcb error. - * @param default_error The libgamma error to use if the xcb error is not recognised. - * @return The libgamma error. + * @param error_code The xcb error + * @param default_error The libgamma error to use if the xcb error is not recognised + * @return The libgamma error */ -static int translate_error_(int error_code, int default_error) +static int +translate_error_(int error_code, int default_error) { - switch (error_code) - { - case XCB_CONN_ERROR: return errno = ECONNABORTED, LIBGAMMA_ERRNO_SET; - case XCB_CONN_CLOSED_EXT_NOTSUPPORTED: return errno = ENOPROTOOPT, LIBGAMMA_ERRNO_SET; - case XCB_CONN_CLOSED_MEM_INSUFFICIENT: return errno = ENOMEM, LIBGAMMA_ERRNO_SET; - case XCB_CONN_CLOSED_REQ_LEN_EXCEED: return errno = EMSGSIZE, LIBGAMMA_ERRNO_SET; - case XCB_CONN_CLOSED_PARSE_ERR: return LIBGAMMA_NO_SUCH_SITE; - case XCB_CONN_CLOSED_INVALID_SCREEN: return LIBGAMMA_NO_SUCH_PARTITION; - case XCB_CONN_CLOSED_FDPASSING_FAILED: return errno = EIO, LIBGAMMA_ERRNO_SET; - default: - return default_error; - } + switch (error_code) { + case XCB_CONN_ERROR: return errno = ECONNABORTED, LIBGAMMA_ERRNO_SET; + case XCB_CONN_CLOSED_EXT_NOTSUPPORTED: return errno = ENOPROTOOPT, LIBGAMMA_ERRNO_SET; + case XCB_CONN_CLOSED_MEM_INSUFFICIENT: return errno = ENOMEM, LIBGAMMA_ERRNO_SET; + case XCB_CONN_CLOSED_REQ_LEN_EXCEED: return errno = EMSGSIZE, LIBGAMMA_ERRNO_SET; + case XCB_CONN_CLOSED_PARSE_ERR: return LIBGAMMA_NO_SUCH_SITE; + case XCB_CONN_CLOSED_INVALID_SCREEN: return LIBGAMMA_NO_SUCH_PARTITION; + case XCB_CONN_CLOSED_FDPASSING_FAILED: return errno = EIO, LIBGAMMA_ERRNO_SET; + default: + return default_error; + } } /** - * Translate an xcb error into a libgamma error. + * Translate an xcb error into a libgamma error * - * @param error_code The xcb error. - * @param default_error The libgamma error to use if the xcb error is not recognised. - * @param return_errno Whether an `errno` value may be returned. - * @return The libgamma error. + * @param error_code The xcb error + * @param default_error The libgamma error to use if the xcb error is not recognised + * @param return_errno Whether an `errno` value may be returned + * @return The libgamma error */ -static int translate_error(int error_code, int default_error, int return_errno) +static int +translate_error(int error_code, int default_error, int return_errno) { - int r = translate_error_(error_code, default_error); - return return_errno ? (r > 0 ? errno : r) : r; + int r = translate_error_(error_code, default_error); + return (return_errno && r > 0) ? errno : r; } /** - * Return the capabilities of the adjustment method. + * Return the capabilities of the adjustment method * - * @param this The data structure to fill with the method's capabilities. + * @param this The data structure to fill with the method's capabilities */ -void libgamma_x_randr_method_capabilities(libgamma_method_capabilities_t* restrict this) +void +libgamma_x_randr_method_capabilities(libgamma_method_capabilities_t *restrict this) { - char* display = getenv("DISPLAY"); - /* Support for all information except active status and gamma ramp support. - Active status can be queried but it is not guaranteed produces an up to date result. */ - this->crtc_information = LIBGAMMA_CRTC_INFO_MACRO_EDID - | LIBGAMMA_CRTC_INFO_MACRO_VIEWPORT - | LIBGAMMA_CRTC_INFO_MACRO_RAMP - | LIBGAMMA_CRTC_INFO_SUBPIXEL_ORDER - | LIBGAMMA_CRTC_INFO_MACRO_CONNECTOR; - /* X RandR supports multiple sites, partitions and CRTC:s. */ - this->default_site_known = (display && *display) ? 1 : 0; - this->multiple_sites = 1; - this->multiple_partitions = 1; - this->multiple_crtcs = 1; - /* Partitions are screens and not graphics cards in X. */ - this->partitions_are_graphics_cards = 0; - /* X does not have system restore capabilities. */ - this->site_restore = 0; - this->partition_restore = 0; - this->crtc_restore = 0; - /* Gamma ramp sizes are identical but not fixed. */ - this->identical_gamma_sizes = 1; - this->fixed_gamma_size = 0; - /* Gamma ramp depths are fixed. */ - this->fixed_gamma_depth = 1; - /* X RandR is a real non-faked adjustment method. */ - this->real = 1; - this->fake = 0; - /* Gamma ramp adjustments are persistent. */ - this->auto_restore = 0; + char *display = getenv("DISPLAY"); + /* Support for all information except active status and gamma ramp support. + Active status can be queried but it is not guaranteed produces an up to date result. */ + this->crtc_information = LIBGAMMA_CRTC_INFO_MACRO_EDID + | LIBGAMMA_CRTC_INFO_MACRO_VIEWPORT + | LIBGAMMA_CRTC_INFO_MACRO_RAMP + | LIBGAMMA_CRTC_INFO_SUBPIXEL_ORDER + | LIBGAMMA_CRTC_INFO_MACRO_CONNECTOR; + /* X RandR supports multiple sites, partitions and CRTC:s */ + this->default_site_known = display && *display; + this->multiple_sites = 1; + this->multiple_partitions = 1; + this->multiple_crtcs = 1; + /* Partitions are screens and not graphics cards in X */ + this->partitions_are_graphics_cards = 0; + /* X does not have system restore capabilities */ + this->site_restore = 0; + this->partition_restore = 0; + this->crtc_restore = 0; + /* Gamma ramp sizes are identical but not fixed */ + this->identical_gamma_sizes = 1; + this->fixed_gamma_size = 0; + /* Gamma ramp depths are fixed */ + this->fixed_gamma_depth = 1; + /* X RandR is a real non-faked adjustment method */ + this->real = 1; + this->fake = 0; + /* Gamma ramp adjustments are persistent */ + this->auto_restore = 0; } -/* xcb violates the rule to never return struct:s. */ -#ifdef __GCC__ +/* xcb violates the rule to never return struct:s */ +#ifdef __GNUC__ # pragma GCC diagnostic push # pragma GCC diagnostic ignored "-Waggregate-return" #endif /** - * Initialise an allocated site state. + * Initialise an allocated site state * - * @param this The site state to initialise. + * @param this The site state to initialise * @param site The site identifier, unless it is `NULL` it must a * `free`:able. Once the state is destroyed the library * will attempt to free it. There you should not free @@ -181,802 +166,820 @@ void libgamma_x_randr_method_capabilities(libgamma_method_capabilities_t* restri * or allocate on the stack. Note however that it will * not be free:d if this function fails. * @return Zero on success, otherwise (negative) the value of an - * error identifier provided by this library. + * error identifier provided by this library */ -int libgamma_x_randr_site_initialise(libgamma_site_state_t* restrict this, - char* restrict site) +int +libgamma_x_randr_site_initialise(libgamma_site_state_t *restrict this, char *restrict site) { - xcb_generic_error_t* error = NULL; - xcb_connection_t* restrict connection; - xcb_randr_query_version_cookie_t cookie; - xcb_randr_query_version_reply_t* restrict reply; - const xcb_setup_t* restrict setup; - xcb_screen_iterator_t iter; - - /* Connect to the display server. */ - this->data = connection = xcb_connect(site, NULL); - if (connection == NULL || xcb_connection_has_error(connection)) - return LIBGAMMA_OPEN_SITE_FAILED; - - /* Query the version of the X RandR extension protocol. */ - cookie = xcb_randr_query_version(connection, RANDR_VERSION_MAJOR, RANDR_VERSION_MINOR); - reply = xcb_randr_query_version_reply(connection, cookie, &error); - - /* Check for version query failure. */ - if ((error != NULL) || (reply == NULL)) - { - /* Release resources. */ - free(reply); - /* If `xcb_connect` failed, both `error` and `reply` will be `NULL`. - XXX: Can both be `NULL` for any other reason? */ - if ((error == NULL) && (reply == NULL)) - return LIBGAMMA_OPEN_SITE_FAILED; - xcb_disconnect(connection); - /* Translate and report error. */ - if (error != NULL) - return translate_error(error->error_code, LIBGAMMA_PROTOCOL_VERSION_QUERY_FAILED, 0); - return LIBGAMMA_PROTOCOL_VERSION_QUERY_FAILED; - } - - /* Check protocol compatibility, - we require 1.3 but 2.x may not be backwards compatible. */ - if ((reply->major_version != RANDR_VERSION_MAJOR) || - (reply->minor_version < RANDR_VERSION_MINOR)) - { + xcb_generic_error_t *error = NULL; + xcb_connection_t *restrict connection; + xcb_randr_query_version_cookie_t cookie; + xcb_randr_query_version_reply_t *restrict reply; + const xcb_setup_t *restrict setup; + xcb_screen_iterator_t iter; + + /* Connect to the display server */ + this->data = connection = xcb_connect(site, NULL); + if (!connection || xcb_connection_has_error(connection)) + return LIBGAMMA_OPEN_SITE_FAILED; + + /* Query the version of the X RandR extension protocol */ + cookie = xcb_randr_query_version(connection, RANDR_VERSION_MAJOR, RANDR_VERSION_MINOR); + reply = xcb_randr_query_version_reply(connection, cookie, &error); + + /* Check for version query failure */ + if (error || !reply) { + /* Release resources */ + free(reply); + /* If `xcb_connect` failed, both `error` and `reply` will be `NULL`. + XXX: Can both be `NULL` for any other reason? */ + if (!error && !reply) + return LIBGAMMA_OPEN_SITE_FAILED; + xcb_disconnect(connection); + /* Translate and report error. */ + if (error != NULL) + return translate_error(error->error_code, LIBGAMMA_PROTOCOL_VERSION_QUERY_FAILED, 0); + return LIBGAMMA_PROTOCOL_VERSION_QUERY_FAILED; + } + + /* Check protocol compatibility, + we require 1.3 but 2.x may not be backwards compatible */ + if (reply->major_version != RANDR_VERSION_MAJOR || reply->minor_version < RANDR_VERSION_MINOR) { #ifdef DEBUG - /* Print used protocol. */ - fprintf(stderr, "libgamma: RandR protocol version: %u.%u", reply->major_version, reply->minor_version); + /* Print used protocol */ + fprintf(stderr, "libgamma: RandR protocol version: %u.%u", reply->major_version, reply->minor_version); #endif - /* Release resources. */ - free(reply); - xcb_disconnect(connection); - /* Report error. */ - return LIBGAMMA_PROTOCOL_VERSION_NOT_SUPPORTED; - } - - /* We do not longer need to know the version of the protocol. */ - free(reply); - - /* Get available screens. */ - if ((setup = xcb_get_setup(connection)) == NULL) - return xcb_disconnect(connection), LIBGAMMA_LIST_PARTITIONS_FAILED; - iter = xcb_setup_roots_iterator(setup); - /* Get the number of available screens. */ - this->partitions_available = (size_t)(iter.rem); - - /* Sanity check the number of available screens. */ - return iter.rem < 0 ? LIBGAMMA_NEGATIVE_PARTITION_COUNT : 0; + /* Release resources */ + free(reply); + xcb_disconnect(connection); + /* Report error */ + return LIBGAMMA_PROTOCOL_VERSION_NOT_SUPPORTED; + } + + /* We do not longer need to know the version of the protocol */ + free(reply); + + /* Get available screens */ + setup = xcb_get_setup(connection); + if (!setup) { + xcb_disconnect(connection); + return LIBGAMMA_LIST_PARTITIONS_FAILED; + } + iter = xcb_setup_roots_iterator(setup); + /* Get the number of available screens */ + this->partitions_available = (size_t)iter.rem; + + /* Sanity check the number of available screens. */ + return iter.rem >= ? 0 : LIBGAMMA_NEGATIVE_PARTITION_COUNT; } /** - * Release all resources held by a site state. + * Release all resources held by a site state * - * @param this The site state. + * @param this The site state */ -void libgamma_x_randr_site_destroy(libgamma_site_state_t* restrict this) +void +libgamma_x_randr_site_destroy(libgamma_site_state_t *restrict this) { - xcb_disconnect((xcb_connection_t*)(this->data)); + xcb_disconnect((xcb_connection_t *)this->data); } /** - * Restore the gamma ramps all CRTC:s with a site to the system settings. + * Restore the gamma ramps all CRTC:s with a site to the system settings * - * @param this The site state. + * @param this The site state * @return Zero on success, otherwise (negative) the value of an - * error identifier provided by this library. + * error identifier provided by this library */ -int libgamma_x_randr_site_restore(libgamma_site_state_t* restrict this) +int +libgamma_x_randr_site_restore(libgamma_site_state_t *restrict this) { - (void) this; - return errno = ENOTSUP, LIBGAMMA_ERRNO_SET; + (void) this; + errno = ENOTSUP; + return LIBGAMMA_ERRNO_SET; } /** - * Duplicate a memory area. + * Duplicate a memory area * - * @param ptr The memory aree. - * @param bytes The size, in bytes, of the memory area. - * @return A duplication of the memory, `NULL` if zero-length or on error. + * @param ptr The memory area + * @param bytes The size, in bytes, of the memory area + * @return A duplication of the memory, `NULL` if zero-length or on error */ -static inline void* memdup(void* restrict ptr, size_t bytes) +static inline void * +memdup(void *restrict ptr, size_t bytes) { - char* restrict rc; - if ((bytes == 0) || ((rc = malloc(bytes)) == NULL)) - return NULL; - memcpy(rc, ptr, bytes); - return rc; + char *restrict rc; + if (!bytes) + return NULL; + rc = malloc(bytes); + if (!rc) + return NULL; + memcpy(rc, ptr, bytes); + return rc; } /** - * Initialise an allocated partition state. + * Initialise an allocated partition state * - * @param this The partition state to initialise. + * @param this The partition state to initialise * @param site The site state for the site that the partition belongs to. - * @param partition The the index of the partition within the site. + * @param partition The the index of the partition within the site * @return Zero on success, otherwise (negative) the value of an - * error identifier provided by this library. + * error identifier provided by this library */ -int libgamma_x_randr_partition_initialise(libgamma_partition_state_t* restrict this, - libgamma_site_state_t* restrict site, size_t partition) +int +libgamma_x_randr_partition_initialise(libgamma_partition_state_t *restrict this, + libgamma_site_state_t *restrict site, size_t partition) { - int fail_rc = LIBGAMMA_ERRNO_SET; - xcb_connection_t* restrict connection = site->data; - xcb_screen_t* restrict screen = NULL; - xcb_generic_error_t* error = NULL; - const xcb_setup_t* restrict setup; - xcb_screen_iterator_t iter; - xcb_randr_get_screen_resources_current_cookie_t cookie; - xcb_randr_get_screen_resources_current_reply_t* restrict reply; - xcb_randr_crtc_t* restrict crtcs; - xcb_randr_output_t* restrict outputs; - libgamma_x_randr_partition_data_t* restrict data; - size_t i; - - /* Get screen list. */ - if ((setup = xcb_get_setup(connection)) == NULL) - return LIBGAMMA_LIST_PARTITIONS_FAILED; - iter = xcb_setup_roots_iterator(setup); - - /* Get the screen. */ - for (i = 0; iter.rem > 0; i++, xcb_screen_next(&iter)) - if (i == partition) - { - screen = iter.data; - break; - } - /* Report failure if we did not find the screen. */ - if (iter.rem == 0) - return LIBGAMMA_NO_SUCH_PARTITION; - - /* Check that the screen is not `NULL`. (Do not think this can happen, but why not.) */ - if (screen == NULL) - return LIBGAMMA_NULL_PARTITION; - - /* Get the current resources of the screen. */ - cookie = xcb_randr_get_screen_resources_current(connection, screen->root); - reply = xcb_randr_get_screen_resources_current_reply(connection, cookie, &error); - if (error != NULL) - return translate_error(error->error_code, LIBGAMMA_LIST_CRTCS_FAILED, 0); - - /* Get the number of available CRTC:s. */ - this->crtcs_available = reply->num_crtcs; - /* Get the CRTC and output lists. */ - crtcs = xcb_randr_get_screen_resources_current_crtcs(reply); - outputs = xcb_randr_get_screen_resources_current_outputs(reply); - if ((crtcs == NULL) || (outputs == NULL)) - return free(reply), LIBGAMMA_REPLY_VALUE_EXTRACTION_FAILED; - - /* Allocate adjustment method dependent data memory area. - We use `calloc` because we want `data`'s pointers to be `NULL` if not allocated at `fail`. */ - if ((data = calloc(1, sizeof(libgamma_x_randr_partition_data_t))) == NULL) - goto fail; - - /* Copy the CRTC:s, just so we do not have to keep the reply in memory. */ - data->crtcs = memdup(crtcs, (size_t)(reply->num_crtcs) * sizeof(xcb_randr_crtc_t)); - if ((data->crtcs == NULL) && (reply->num_crtcs > 0)) - goto fail; - - /* Copy the outputs as well. */ - data->outputs = memdup(outputs, (size_t)(reply->num_outputs) * sizeof(xcb_randr_output_t)); - if ((data->outputs == NULL) && (reply->num_outputs > 0)) - goto fail; - - /* Get the number of available outputs. */ - data->outputs_count = (size_t)(reply->num_outputs); - - /* Create mapping table from CRTC indices to output indicies. (injection) */ - if ((data->crtc_to_output = malloc((size_t)(reply->num_crtcs) * sizeof(size_t))) == NULL) - goto fail; - /* All CRTC:s should be mapped, but incase they are not, all unmapped CRTC:s should have - an invalid target, namely `SIZE_MAX`, which is 1 more than the theoretical limit. */ - for (i = 0; i < (size_t)(reply->num_crtcs); i++) - data->crtc_to_output[i] = SIZE_MAX; - /* Fill the table. */ - for (i = 0; i < (size_t)(reply->num_outputs); i++) - { - xcb_randr_get_output_info_cookie_t out_cookie; - xcb_randr_get_output_info_reply_t* out_reply; - uint16_t j; - - /* Query output (target) information. */ - out_cookie = xcb_randr_get_output_info(connection, outputs[i], reply->config_timestamp); - out_reply = xcb_randr_get_output_info_reply(connection, out_cookie, &error); - if (error != NULL) - { - fail_rc = translate_error(error->error_code, LIBGAMMA_OUTPUT_INFORMATION_QUERY_FAILED, 0); - goto fail; + int fail_rc = LIBGAMMA_ERRNO_SET; + xcb_connection_t *restrict connection = site->data; + xcb_screen_t *restrict screen = NULL; + xcb_generic_error_t *error = NULL; + const xcb_setup_t *restrict setup; + xcb_screen_iterator_t iter; + xcb_randr_get_screen_resources_current_cookie_t cookie; + xcb_randr_get_screen_resources_current_reply_t *restrict reply; + xcb_randr_crtc_t *restrict crtcs; + xcb_randr_output_t *restrict outputs; + libgamma_x_randr_partition_data_t *restrict data; + xcb_randr_get_output_info_cookie_t out_cookie; + xcb_randr_get_output_info_reply_t *out_reply; + size_t i; + uint16_t j; + + /* Get screen list */ + setup = xcb_get_setup(connection); + if (!setup) + return LIBGAMMA_LIST_PARTITIONS_FAILED; + iter = xcb_setup_roots_iterator(setup); + + /* Get the screen */ + for (i = 0; iter.rem > 0; i++, xcb_screen_next(&iter)) + if (i == partition) { + screen = iter.data; + break; + } + /* Report failure if we did not find the screen */ + if (!iter.rem) + return LIBGAMMA_NO_SUCH_PARTITION; + + /* Check that the screen is not `NULL`. + * (Do not think this can happen, but why not.) */ + if (!screen) + return LIBGAMMA_NULL_PARTITION; + + /* Get the current resources of the screen */ + cookie = xcb_randr_get_screen_resources_current(connection, screen->root); + reply = xcb_randr_get_screen_resources_current_reply(connection, cookie, &error); + if (error) + return translate_error(error->error_code, LIBGAMMA_LIST_CRTCS_FAILED, 0); + + /* Get the number of available CRTC:s */ + this->crtcs_available = reply->num_crtcs; + /* Get the CRTC and output lists */ + crtcs = xcb_randr_get_screen_resources_current_crtcs(reply); + outputs = xcb_randr_get_screen_resources_current_outputs(reply); + if (!crtcs || !outputs) { + free(reply); + return LIBGAMMA_REPLY_VALUE_EXTRACTION_FAILED; } - - /* Find CRTC (source). */ - for (j = 0; j < reply->num_crtcs; j++) - if (crtcs[j] == out_reply->crtc) - { - data->crtc_to_output[j] = i; - break; - } - - /* Release output information. */ - free(out_reply); - } - - /* Store the configuration timestamp. */ - data->config_timestamp = reply->config_timestamp; - /* Store the adjustment method dependent data. */ - this->data = data; - /* Release resources and return successfully. */ - free(reply); - return 0; - - fail: - /* Release resources and return with an error. */ - if (data != NULL) - { - free(data->crtcs); - free(data->outputs); - free(data->crtc_to_output); - free(data); - } - free(reply); - return fail_rc; + + /* Allocate adjustment method dependent data memory area. + We use `calloc` because we want `data`'s pointers to be `NULL` if not allocated at `fail`. */ + data = calloc(1, sizeof(libgamma_x_randr_partition_data_t)); + if (!data) + goto fail; + + /* Copy the CRTC:s, just so we do not have to keep the reply in memory */ + data->crtcs = memdup(crtcs, (size_t)(reply->num_crtcs) * sizeof(xcb_randr_crtc_t)); + if (!data->crtcs && reply->num_crtcs > 0) + goto fail; + + /* Copy the outputs as well */ + data->outputs = memdup(outputs, (size_t)reply->num_outputs * sizeof(xcb_randr_output_t)); + if (!data->outputs && reply->num_outputs > 0) + goto fail; + + /* Get the number of available outputs */ + data->outputs_count = (size_t)reply->num_outputs; + + /* Create mapping table from CRTC indices to output indicies. (injection) */ + data->crtc_to_output = malloc((size_t)reply->num_crtcs * sizeof(size_t)); + if (!data->crtc) + goto fail; + /* All CRTC:s should be mapped, but incase they are not, all unmapped CRTC:s should have + an invalid target, namely `SIZE_MAX`, which is 1 more than the theoretical limit */ + for (i = 0; i < (size_t)reply->num_crtcs; i++) + data->crtc_to_output[i] = SIZE_MAX; + /* Fill the table */ + for (i = 0; i < (size_t)reply->num_outputs; i++) { + /* Query output (target) information */ + out_cookie = xcb_randr_get_output_info(connection, outputs[i], reply->config_timestamp); + out_reply = xcb_randr_get_output_info_reply(connection, out_cookie, &error); + if (error) { + fail_rc = translate_error(error->error_code, LIBGAMMA_OUTPUT_INFORMATION_QUERY_FAILED, 0); + goto fail; + } + + /* Find CRTC (source) */ + for (j = 0; j < reply->num_crtcs; j++) { + if (crtcs[j] == out_reply->crtc) { + data->crtc_to_output[j] = i; + break; + } + } + + /* Release output information */ + free(out_reply); + } + + /* Store the configuration timestamp */ + data->config_timestamp = reply->config_timestamp; + /* Store the adjustment method dependent data */ + this->data = data; + /* Release resources and return successfully */ + free(reply); + return 0; + +fail: + /* Release resources and return with an error */ + if (data) { + free(data->crtcs); + free(data->outputs); + free(data->crtc_to_output); + free(data); + } + free(reply); + return fail_rc; } /** - * Release all resources held by a partition state. + * Release all resources held by a partition state * - * @param this The partition state. + * @param this The partition state */ -void libgamma_x_randr_partition_destroy(libgamma_partition_state_t* restrict this) +void +libgamma_x_randr_partition_destroy(libgamma_partition_state_t *restrict this) { - libgamma_x_randr_partition_data_t* restrict data = this->data; - free(data->crtcs); - free(data->outputs); - free(data->crtc_to_output); - free(data); + libgamma_x_randr_partition_data_t *restrict data = this->data; + free(data->crtcs); + free(data->outputs); + free(data->crtc_to_output); + free(data); } /** - * Restore the gamma ramps all CRTC:s with a partition to the system settings. + * Restore the gamma ramps all CRTC:s with a partition to the system settings * - * @param this The partition state. + * @param this The partition state * @return Zero on success, otherwise (negative) the value of an - * error identifier provided by this library. + * error identifier provided by this library */ -int libgamma_x_randr_partition_restore(libgamma_partition_state_t* restrict this) +int +libgamma_x_randr_partition_restore(libgamma_partition_state_t *restrict this) { - (void) this; - return errno = ENOTSUP, LIBGAMMA_ERRNO_SET; + (void) this; + errno = ENOTSUP; + return LIBGAMMA_ERRNO_SET; } /** - * Initialise an allocated CRTC state. + * Initialise an allocated CRTC state * - * @param this The CRTC state to initialise. + * @param this The CRTC state to initialise * @param partition The partition state for the partition that the CRTC belongs to. - * @param crtc The the index of the CRTC within the site. + * @param crtc The the index of the CRTC within the site * @return Zero on success, otherwise (negative) the value of an - * error identifier provided by this library. + * error identifier provided by this library */ -int libgamma_x_randr_crtc_initialise(libgamma_crtc_state_t* restrict this, - libgamma_partition_state_t* restrict partition, size_t crtc) +int +libgamma_x_randr_crtc_initialise(libgamma_crtc_state_t *restrict this, + libgamma_partition_state_t *restrict partition, size_t crtc) { - libgamma_x_randr_partition_data_t* restrict screen_data = partition->data; - xcb_randr_crtc_t* restrict crtc_ids = screen_data->crtcs; - this->data = crtc_ids + crtc; - return crtc >= partition->crtcs_available ? LIBGAMMA_NO_SUCH_CRTC : 0; + libgamma_x_randr_partition_data_t *restrict screen_data = partition->data; + xcb_randr_crtc_t *restrict crtc_ids = screen_data->crtcs; + this->data = crtc_ids + crtc; + return crtc < partition->crtcs_available ? 0 : LIBGAMMA_NO_SUCH_CRTC; } /** - * Release all resources held by a CRTC state. + * Release all resources held by a CRTC state * - * @param this The CRTC state. + * @param this The CRTC state */ -void libgamma_x_randr_crtc_destroy(libgamma_crtc_state_t* restrict this) +void +libgamma_x_randr_crtc_destroy(libgamma_crtc_state_t *restrict this) { - (void) this; + (void) this; } /** - * Restore the gamma ramps for a CRTC to the system settings for that CRTC. + * Restore the gamma ramps for a CRTC to the system settings for that CRTC * - * @param this The CRTC state. + * @param this The CRTC state * @return Zero on success, otherwise (negative) the value of an - * error identifier provided by this library. + * error identifier provided by this library */ -int libgamma_x_randr_crtc_restore(libgamma_crtc_state_t* restrict this) +int +libgamma_x_randr_crtc_restore(libgamma_crtc_state_t *restrict this) { - (void) this; - return errno = ENOTSUP, LIBGAMMA_ERRNO_SET; + (void) this; + errno = ENOTSUP; + return LIBGAMMA_ERRNO_SET; } /** - * Get the gamma ramp size of a CRTC. + * Get the gamma ramp size of a CRTC * - * @param this Instance of a data structure to fill with the information about the CRTC. - * @param crtc The state of the CRTC whose information should be read. - * @return Non-zero on error. + * @param this Instance of a data structure to fill with the information about the CRTC + * @param crtc The state of the CRTC whose information should be read + * @return Non-zero on error */ -static int get_gamma_ramp_size(libgamma_crtc_information_t* restrict out, libgamma_crtc_state_t* restrict crtc) +static int +get_gamma_ramp_size(libgamma_crtc_information_t *restrict out, libgamma_crtc_state_t *restrict crtc) { - xcb_connection_t* restrict connection = crtc->partition->site->data; - xcb_randr_crtc_t* restrict crtc_id = crtc->data; - xcb_randr_get_crtc_gamma_size_cookie_t cookie; - xcb_randr_get_crtc_gamma_size_reply_t* restrict reply; - xcb_generic_error_t* error; - - /* Query gamma ramp size. */ - out->gamma_size_error = 0; - cookie = xcb_randr_get_crtc_gamma_size(connection, *crtc_id); - reply = xcb_randr_get_crtc_gamma_size_reply(connection, cookie, &error); - if (error != NULL) - return out->gamma_size_error = translate_error(error->error_code, LIBGAMMA_GAMMA_RAMPS_SIZE_QUERY_FAILED, 1); - /* Sanity check gamma ramp size. */ - if (reply->size < 2) - out->gamma_size_error = LIBGAMMA_SINGLETON_GAMMA_RAMP; - /* Store gamma ramp size. */ - out->red_gamma_size = out->green_gamma_size = out->blue_gamma_size = reply->size; - /* Release resources and return successfulnes. */ - free(reply); - return out->gamma_size_error; + xcb_connection_t *restrict connection = crtc->partition->site->data; + xcb_randr_crtc_t *restrict crtc_id = crtc->data; + xcb_randr_get_crtc_gamma_size_cookie_t cookie; + xcb_randr_get_crtc_gamma_size_reply_t *restrict reply; + xcb_generic_error_t *error; + + /* Query gamma ramp size */ + out->gamma_size_error = 0; + cookie = xcb_randr_get_crtc_gamma_size(connection, *crtc_id); + reply = xcb_randr_get_crtc_gamma_size_reply(connection, cookie, &error); + if (error) { + out->gamma_size_error = translate_error(error->error_code, LIBGAMMA_GAMMA_RAMPS_SIZE_QUERY_FAILED, 1); + return out->gamma_size_error; + } + /* Sanity check gamma ramp size */ + if (reply->size < 2) + out->gamma_size_error = LIBGAMMA_SINGLETON_GAMMA_RAMP; + /* Store gamma ramp size */ + out->red_gamma_size = out->green_gamma_size = out->blue_gamma_size = reply->size; + /* Release resources and return successfulnes */ + free(reply); + return out->gamma_size_error; } /** - * Read information from the CRTC's output. + * Read information from the CRTC's output * - * @param out Instance of a data structure to fill with the information about the CRTC. - * @param output The CRTC's output information. - * @return Non-zero if at least on error occured. + * @param out Instance of a data structure to fill with the information about the CRTC + * @param output The CRTC's output information + * @return Non-zero if at least on error occured */ -static int read_output_data(libgamma_crtc_information_t* restrict out, xcb_randr_get_output_info_reply_t* restrict output) +static int +read_output_data(libgamma_crtc_information_t *restrict out, xcb_randr_get_output_info_reply_t *restrict output) { -#define __select(value) \ - case XCB_RENDER_SUB_PIXEL_##value: out->subpixel_order = LIBGAMMA_SUBPIXEL_ORDER_##value; break - - switch (output->connection) - { - case XCB_RANDR_CONNECTION_CONNECTED: - /* We have a monitor connected, report that and store information that is provided to us. */ - out->active = 1; - out->width_mm = output->mm_width; - out->height_mm = output->mm_height; - switch (output->subpixel_order) - { - __select (UNKNOWN); - __select (HORIZONTAL_RGB); - __select (HORIZONTAL_BGR); - __select (VERTICAL_RGB); - __select (VERTICAL_BGR); - __select (NONE); +#define __select(value)\ + case XCB_RENDER_SUB_PIXEL_##value: out->subpixel_order = LIBGAMMA_SUBPIXEL_ORDER_##value; break + + switch (output->connection) { + case XCB_RANDR_CONNECTION_CONNECTED: + /* We have a monitor connected, report that and store information that is provided to us */ + out->active = 1; + out->width_mm = output->mm_width; + out->height_mm = output->mm_height; + switch (output->subpixel_order) { + __select (UNKNOWN); + __select (HORIZONTAL_RGB); + __select (HORIZONTAL_BGR); + __select (VERTICAL_RGB); + __select (VERTICAL_BGR); + __select (NONE); + default: + out->subpixel_order_error = LIBGAMMA_SUBPIXEL_ORDER_NOT_RECOGNISED; + break; + } + return 0; + + case XCB_RANDR_CONNECTION_UNKNOWN: + /* If we do know whether a monitor is connected report that and assume it is not */ + out->active_error = LIBGAMMA_STATE_UNKNOWN; + /* fall through */ default: - out->subpixel_order_error = LIBGAMMA_SUBPIXEL_ORDER_NOT_RECOGNISED; - break; + /* If no monitor is connected, report that on fails that require it */ + out->width_mm_error = LIBGAMMA_NOT_CONNECTED; + out->height_mm_error = LIBGAMMA_NOT_CONNECTED; + out->subpixel_order_error = LIBGAMMA_NOT_CONNECTED; + /* And store that we are not connected */ + out->active = 0; + /* This fuction only failed if we could not figure out whether a monitor is connected */ + return output->connection != XCB_RANDR_CONNECTION_UNKNOWN ? 0 : -1; } - return 0; - - case XCB_RANDR_CONNECTION_UNKNOWN: - /* If we do know whether a monitor is connected report that and assume it is not. */ - out->active_error = LIBGAMMA_STATE_UNKNOWN; - /* Fall through. */ - default: - /* If no monitor is connected, report that on fails that require it. */ - out->width_mm_error = LIBGAMMA_NOT_CONNECTED; - out->height_mm_error = LIBGAMMA_NOT_CONNECTED; - out->subpixel_order_error = LIBGAMMA_NOT_CONNECTED; - /* And store that we are not connected. */ - out->active = 0; - /* This fuction only failed if we could not figure out whether a monitor is connected. */ - return (output->connection == XCB_RANDR_CONNECTION_UNKNOWN) ? -1 : 0; - } - + #undef __select } /** - * Determine the connector type from the connector name. + * Determine the connector type from the connector name * - * @param this The CRTC information to use and extend. - * @param Non-zero on error. + * @param this The CRTC information to use and extend + * @param Non-zero on error */ -static int get_connector_type(libgamma_crtc_information_t* restrict this) +static int +get_connector_type(libgamma_crtc_information_t *restrict this) { - /* Since we require the name of the output of get the type of the connected, - copy any reported error on the output's name to the connector's type, - and report failure if there was an error. */ - if ((this->connector_type_error = this->connector_name_error)) - return -1; - -#define __select(name, type) \ - if (strstr(this->connector_name, name "-") == this->connector_name) \ - return this->connector_type = LIBGAMMA_CONNECTOR_TYPE_##type, 0 - - /* Check begin on the name of the output to find out what type the connector is of. */ - __select ("None", Unknown); - __select ("VGA", VGA); - __select ("DVI-I", DVII); - __select ("DVI-D", DVID); - __select ("DVI-A", DVIA); - __select ("DVI", DVI); - __select ("Composite", Composite); - __select ("S-Video", SVIDEO); - __select ("Component", Component); - __select ("LFP", LFP); - __select ("Proprietary", Unknown); - __select ("HDMI", HDMI); - __select ("DisplayPort", DisplayPort); - + /* Since we require the name of the output of get the type of the connected, + copy any reported error on the output's name to the connector's type, + and report failure if there was an error */ + if ((this->connector_type_error = this->connector_name_error)) + return -1; + +#define __select(name, type)\ + do {\ + if (strstr(this->connector_name, name "-") == this->connector_name) {\ + this->connector_type = LIBGAMMA_CONNECTOR_TYPE_##type\ + return 0;\ + }\ + } while (0) + + /* Check begin on the name of the output to find out what type the connector is of */ + __select ("None", Unknown); + __select ("VGA", VGA); + __select ("DVI-I", DVII); + __select ("DVI-D", DVID); + __select ("DVI-A", DVIA); + __select ("DVI", DVI); + __select ("Composite", Composite); + __select ("S-Video", SVIDEO); + __select ("Component", Component); + __select ("LFP", LFP); + __select ("Proprietary", Unknown); + __select ("HDMI", HDMI); + __select ("DisplayPort", DisplayPort); + #undef __select - - /* If there was no matching output name pattern report that and exit with an error. */ - this->connector_name_error = LIBGAMMA_CONNECTOR_TYPE_NOT_RECOGNISED; - return -1; + + /* If there was no matching output name pattern report that and exit with an error */ + this->connector_name_error = LIBGAMMA_CONNECTOR_TYPE_NOT_RECOGNISED; + return -1; } /** - * Get the output name of a CRTC. + * Get the output name of a CRTC * - * @param this Instance of a data structure to fill with the information about the CRTC. - * @param output The CRTC's output's information. - * @return Non-zero on error. + * @param this Instance of a data structure to fill with the information about the CRTC + * @param output The CRTC's output's information + * @return Non-zero on error */ -static int get_output_name(libgamma_crtc_information_t* restrict out, xcb_randr_get_output_info_reply_t* restrict output) +static int +get_output_name(libgamma_crtc_information_t *restrict out, xcb_randr_get_output_info_reply_t *restrict output) { - char* restrict store; - uint8_t* restrict name; - uint16_t length; - size_t i; - - /* Get the name of the output and the length of that name. */ - name = xcb_randr_get_output_info_name(output); - length = output->name_len; /* There is no NUL-termination. */ - if (name == NULL) - return out->connector_name_error = LIBGAMMA_REPLY_VALUE_EXTRACTION_FAILED; - - /* Allocate a memory area for a NUL-terminated copy of the name. */ - store = out->connector_name = malloc(((size_t)length + 1) * sizeof(char)); - if (store == NULL) - return out->connector_name_error = errno, -1; - - /* char is guaranteed to be (u)int_least8_t, but it is only guaranteed to be (u)int8_t - * on POSIX, so to be truly portable we will not assume that char is (u)int8_t. */ - for (i = 0; i < (size_t)length; i++) - store[i] = (char)(name[i]); - store[length] = '\0'; - - return 0; + char *restrict store; + uint8_t *restrict name; + uint16_t length; + size_t i; + + /* Get the name of the output and the length of that name */ + name = xcb_randr_get_output_info_name(output); + length = output->name_len; /* There is no NUL-termination */ + if (!name) + return out->connector_name_error = LIBGAMMA_REPLY_VALUE_EXTRACTION_FAILED; + + /* Allocate a memory area for a NUL-terminated copy of the name */ + store = out->connector_name = malloc(((size_t)length + 1) * sizeof(char)); + if (!store) { + out->connector_name_error = errno; + return -1; + } + + /* char is guaranteed to be (u)int_least8_t, but it is only guaranteed to be (u)int8_t + * on POSIX, so to be truly portable we will not assume that char is (u)int8_t */ + for (i = 0; i < (size_t)length; i++) + store[i] = (char)name[i]; + store[length] = '\0'; + + return 0; } /** - * Get the Extended Display Information Data of the monitor connected to the connector of a CRTC. + * Get the Extended Display Information Data of the monitor connected to the connector of a CRTC * - * @param out Instance of a data structure to fill with the information about the CRTC. - * @param crtc The state of the CRTC whose information should be read. - * @param output The CRTC's output. - * @return Non-zero on error. + * @param out Instance of a data structure to fill with the information about the CRTC + * @param crtc The state of the CRTC whose information should be read + * @param output The CRTC's output + * @return Non-zero on error */ -static int get_edid(libgamma_crtc_information_t* restrict out, - libgamma_crtc_state_t* restrict crtc, xcb_randr_output_t output) +static int +get_edid(libgamma_crtc_information_t *restrict out, libgamma_crtc_state_t *restrict crtc, xcb_randr_output_t output) { - xcb_connection_t* restrict connection = crtc->partition->site->data; - xcb_randr_list_output_properties_cookie_t prop_cookie; - xcb_randr_list_output_properties_reply_t* restrict prop_reply; - xcb_atom_t* atoms; - xcb_atom_t* atoms_end; - xcb_generic_error_t* error; - - /* Acquire a list of all properties of the output. */ - prop_cookie = xcb_randr_list_output_properties(connection, output); - prop_reply = xcb_randr_list_output_properties_reply(connection, prop_cookie, &error); - if (error != NULL) - return out->edid_error = translate_error(error->error_code, LIBGAMMA_LIST_PROPERTIES_FAILED, 1); - - /* Extract the properties form the data structure that holds them, */ - atoms = xcb_randr_list_output_properties_atoms(prop_reply); - /* and get the last one so that we can iterate over them nicely. */ - atoms_end = atoms + xcb_randr_list_output_properties_atoms_length(prop_reply); - - if (atoms == NULL) - return free(prop_reply), out->edid_error = LIBGAMMA_REPLY_VALUE_EXTRACTION_FAILED; - - /* For each property */ - for (; atoms != atoms_end; atoms++) - { - xcb_get_atom_name_cookie_t atom_name_cookie; - xcb_get_atom_name_reply_t* restrict atom_name_reply; - char* restrict atom_name; - int atom_name_len; - xcb_randr_get_output_property_cookie_t atom_cookie; - xcb_randr_get_output_property_reply_t* restrict atom_reply; - unsigned char* restrict atom_data; - int length; - - /* Acquire the atom name. */ - atom_name_cookie = xcb_get_atom_name(connection, *atoms); - atom_name_reply = xcb_get_atom_name_reply(connection, atom_name_cookie, &error); - if (error) - continue; - - /* Extract the atom name from the data structure that holds it. */ - atom_name = xcb_get_atom_name_name(atom_name_reply); - /* As well as the length of the name; it is not NUL-termianted.*/ - atom_name_len = xcb_get_atom_name_name_length(atom_name_reply); - - if (/* Check for errors. */ - (atom_name == NULL) || /* (atom_name_len < 1) || */ - /* Check that the length is the expected length for the EDID property. */ - (atom_name_len != 4) || - /* Check that the property is the EDID property. */ - (atom_name[0] != 'E') || (atom_name[1] != 'D') || (atom_name[2] != 'I') || (atom_name[3] != 'D')) - { - free(atom_name_reply); - continue; - } - - /* Acquire the property's value, we know that it is either 128 or 256 byte long. */ - atom_cookie = xcb_randr_get_output_property(connection, output, *atoms, - XCB_GET_PROPERTY_TYPE_ANY, 0, 256, 0, 0); - atom_reply = xcb_randr_get_output_property_reply(connection, atom_cookie, &error); - /* (*) EDID version 1.0 through 1.4 define it as 128 bytes long, - * but version 2.0 define it as 256 bytes long. However, - * version 2.0 is rare(?) and has been deprecated and replaced - * by version 1.3 (I guess that is with a new version epoch, - * but I do not know.) */ - if (error) - { - free(atom_name_reply); - free(prop_reply); - return out->edid_error = LIBGAMMA_PROPERTY_VALUE_QUERY_FAILED; + xcb_connection_t *restrict connection = crtc->partition->site->data; + xcb_randr_list_output_properties_cookie_t prop_cookie; + xcb_randr_list_output_properties_reply_t *restrict prop_reply; + xcb_atom_t *atoms; + xcb_atom_t *atoms_end; + xcb_generic_error_t *error; + xcb_get_atom_name_cookie_t atom_name_cookie; + xcb_get_atom_name_reply_t *restrict atom_name_reply; + char *restrict atom_name; + int atom_name_len; + xcb_randr_get_output_property_cookie_t atom_cookie; + xcb_randr_get_output_property_reply_t *restrict atom_reply; + unsigned char* restrict atom_data; + int length; + + /* Acquire a list of all properties of the output */ + prop_cookie = xcb_randr_list_output_properties(connection, output); + prop_reply = xcb_randr_list_output_properties_reply(connection, prop_cookie, &error); + if (error) + return out->edid_error = translate_error(error->error_code, LIBGAMMA_LIST_PROPERTIES_FAILED, 1); + + /* Extract the properties form the data structure that holds them, */ + atoms = xcb_randr_list_output_properties_atoms(prop_reply); + /* and get the last one so that we can iterate over them nicely */ + atoms_end = atoms + xcb_randr_list_output_properties_atoms_length(prop_reply); + + if (!atoms) { + free(prop_reply); + return out->edid_error = LIBGAMMA_REPLY_VALUE_EXTRACTION_FAILED; } - - /* Extract the property's value, */ - atom_data = xcb_randr_get_output_property_data(atom_reply); - /* and its actual length. */ - length = xcb_randr_get_output_property_data_length(atom_reply); - if ((atom_data == NULL) || (length < 1)) - { - free(atom_reply); - free(atom_name_reply); - free(prop_reply); - return out->edid_error = LIBGAMMA_REPLY_VALUE_EXTRACTION_FAILED; + + /* For each property */ + for (; atoms != atoms_end; atoms++) { + /* Acquire the atom name */ + atom_name_cookie = xcb_get_atom_name(connection, *atoms); + atom_name_reply = xcb_get_atom_name_reply(connection, atom_name_cookie, &error); + if (error) + continue; + + /* Extract the atom name from the data structure that holds it */ + atom_name = xcb_get_atom_name_name(atom_name_reply); + /* As well as the length of the name; it is not NUL-termianted */ + atom_name_len = xcb_get_atom_name_name_length(atom_name_reply); + + if (/* Check for errors */ + !atom_name || /* atom_name_len < 1 || */ + /* Check that the length is the expected length for the EDID property */ + atom_name_len != 4 || + /* Check that the property is the EDID property */ + atom_name[0] != 'E' || atom_name[1] != 'D' || atom_name[2] != 'I' || atom_name[3] != 'D') { + free(atom_name_reply); + continue; + } + + /* Acquire the property's value, we know that it is either 128 or 256 byte long */ + atom_cookie = xcb_randr_get_output_property(connection, output, *atoms, XCB_GET_PROPERTY_TYPE_ANY, 0, 256, 0, 0); + atom_reply = xcb_randr_get_output_property_reply(connection, atom_cookie, &error); + /* (*) EDID version 1.0 through 1.4 define it as 128 bytes long, + * but version 2.0 define it as 256 bytes long. However, + * version 2.0 is rare(?) and has been deprecated and replaced + * by version 1.3 (I guess that is with a new version epoch, + * but I do not know.) */ + if (error) { + free(atom_name_reply); + free(prop_reply); + return out->edid_error = LIBGAMMA_PROPERTY_VALUE_QUERY_FAILED; + } + + /* Extract the property's value */ + atom_data = xcb_randr_get_output_property_data(atom_reply); + /* and its actual length */ + length = xcb_randr_get_output_property_data_length(atom_reply); + if (!atom_data || length < 1) { + free(atom_reply); + free(atom_name_reply); + free(prop_reply); + return out->edid_error = LIBGAMMA_REPLY_VALUE_EXTRACTION_FAILED; + } + + /* Store the EDID */ + out->edid_length = (size_t)length; + out->edid = malloc((size_t)length * sizeof(unsigned char)); + if (!out->edid) + out->edid_error = errno; + else + memcpy(out->edid, atom_data, (size_t)length * sizeof(unsigned char)); + + /* Release resouces */ + free(atom_reply); + free(atom_name_reply); + free(prop_reply); + + return out->edid_error; } - - /* Store the EDID. */ - out->edid_length = (size_t)length; - out->edid = malloc((size_t)length * sizeof(unsigned char)); - if (out->edid == NULL) - out->edid_error = errno; - else - memcpy(out->edid, atom_data, (size_t)length * sizeof(unsigned char)); - - /* Release resouces. */ - free(atom_reply); - free(atom_name_reply); - free(prop_reply); - - return out->edid_error; - } - - return out->edid_error = LIBGAMMA_EDID_NOT_FOUND; + + return out->edid_error = LIBGAMMA_EDID_NOT_FOUND; } /** - * Read information about a CRTC. + * Read information about a CRTC * - * @param this Instance of a data structure to fill with the information about the CRTC. - * @param crtc The state of the CRTC whose information should be read. - * @param fields OR:ed identifiers for the information about the CRTC that should be read. - * @return Zero on success, -1 on error. On error refer to the error reports in `this`.. + * @param this Instance of a data structure to fill with the information about the CRTC + * @param crtc The state of the CRTC whose information should be read + * @param fields OR:ed identifiers for the information about the CRTC that should be read + * @return Zero on success, -1 on error; on error refer to the error reports in `this` */ -int libgamma_x_randr_get_crtc_information(libgamma_crtc_information_t* restrict this, - libgamma_crtc_state_t* restrict crtc, int32_t fields) +int +libgamma_x_randr_get_crtc_information(libgamma_crtc_information_t *restrict this, + libgamma_crtc_state_t *restrict crtc, int32_t fields) { -#define _E(FIELD) ((fields & FIELD) ? LIBGAMMA_CRTC_INFO_NOT_SUPPORTED : 0) - int e = 0; - xcb_randr_get_output_info_reply_t* restrict output_info = NULL; - xcb_randr_output_t output; - int free_edid, free_name; - - /* Wipe all error indicators. */ - memset(this, 0, sizeof(libgamma_crtc_information_t)); - - /* We need to free the EDID after us if it is not explicitly requested. */ - free_edid = (fields & LIBGAMMA_CRTC_INFO_EDID) == 0; - - /* We need to free the output's name after us if it is not explicitly requested. */ - free_name = (fields & LIBGAMMA_CRTC_INFO_CONNECTOR_NAME) == 0; - - /* Jump if the output information is not required. */ - if ((fields & (LIBGAMMA_CRTC_INFO_MACRO_ACTIVE | LIBGAMMA_CRTC_INFO_MACRO_CONNECTOR)) == 0) - goto cont; - - /* Get connector and connector information. */ - { - xcb_connection_t* restrict connection = crtc->partition->site->data; - libgamma_x_randr_partition_data_t* restrict screen_data = crtc->partition->data; - size_t output_index = screen_data->crtc_to_output[crtc->crtc]; - xcb_randr_get_output_info_cookie_t cookie; - xcb_generic_error_t* error; - /* `SIZE_MAX` is used for CRTC:s that misses mapping to its output (should not happen), - because `SIZE_MAX - 1` is the highest theoretical possible value. */ - if (output_index == SIZE_MAX) - { - e |= this->edid_error = this->gamma_error = this->width_mm_edid_error - = this->height_mm_edid_error = this->connector_type_error - = this->connector_name_error = this->subpixel_order_error - = this->width_mm_error = this->height_mm_error - = this->active_error = LIBGAMMA_CONNECTOR_UNKNOWN; - goto cont; - } - /* Get the output. */ - output = screen_data->outputs[output_index]; - /* Query output information. */ - cookie = xcb_randr_get_output_info(connection, output, screen_data->config_timestamp); - output_info = xcb_randr_get_output_info_reply(connection, cookie, &error); - if (error != NULL) - { - e |= this->edid_error = this->gamma_error = this->width_mm_edid_error - = this->height_mm_edid_error = this->connector_type_error - = this->connector_name_error = this->subpixel_order_error - = this->width_mm_error = this->height_mm_error - = this->active_error = LIBGAMMA_OUTPUT_INFORMATION_QUERY_FAILED; - goto cont; - } - } - - /* Get connector name. */ - e |= get_output_name(this, output_info); - /* Get connector type. */ - if ((fields & LIBGAMMA_CRTC_INFO_CONNECTOR_TYPE)) - e |= get_connector_type(this); - /* Get additional output data, excluding EDID. */ - e |= read_output_data(this, output_info); - if ((fields & LIBGAMMA_CRTC_INFO_MACRO_VIEWPORT)) - e |= this->width_mm_error | this->height_mm_error; - e |= (fields & LIBGAMMA_CRTC_INFO_SUBPIXEL_ORDER) ? this->subpixel_order_error : 0; - - /* If we do not want any EDID information, jump. */ - if ((fields & LIBGAMMA_CRTC_INFO_MACRO_EDID) == 0) - goto cont; - /* If there is not monitor that report error in EDID related fields. */ - if (this->active == 0) - { - e |= this->edid_error = this->gamma_error = this->width_mm_edid_error - = this->height_mm_edid_error = LIBGAMMA_NOT_CONNECTED; - goto cont; - } - /* Get EDID. */ - e |= get_edid(this, crtc, output); - if (this->edid == NULL) - { - this->gamma_error = this->width_mm_edid_error = this->height_mm_edid_error = this->edid_error; - goto cont; - } - /* Parse EDID. */ - if ((fields & (LIBGAMMA_CRTC_INFO_MACRO_EDID ^ LIBGAMMA_CRTC_INFO_EDID))) - e |= libgamma_parse_edid(this, fields); - - cont: - /* Get gamma ramp size. */ - e |= (fields & LIBGAMMA_CRTC_INFO_GAMMA_SIZE) ? get_gamma_ramp_size(this, crtc) : 0; - /* Store gamma ramp depth. */ - this->gamma_depth = 16; - /* X RandR does not support quering gamma ramp support. */ - e |= this->gamma_support_error = _E(LIBGAMMA_CRTC_INFO_GAMMA_SUPPORT); - - /* Free the EDID after us. */ - if (free_edid) - { - free(this->edid); - this->edid = NULL; - } - /* Free the output name after us. */ - if (free_name) - { - free(this->connector_name); - this->connector_name = NULL; - } - - free(output_info); - return e ? -1 : 0; +#define _E(FIELD) ((fields & FIELD) ? LIBGAMMA_CRTC_INFO_NOT_SUPPORTED : 0) + + int e = 0; + xcb_randr_get_output_info_reply_t *restrict output_info = NULL; + xcb_randr_output_t output; + int free_edid, free_name; + xcb_connection_t *restrict connection; + libgamma_x_randr_partition_data_t *restrict screen_data; + size_t output_index; + xcb_randr_get_output_info_cookie_t cookie; + xcb_generic_error_t *error; + + /* Wipe all error indicators */ + memset(this, 0, sizeof(libgamma_crtc_information_t)); + + /* We need to free the EDID after us if it is not explicitly requested */ + free_edid = !(fields & LIBGAMMA_CRTC_INFO_EDID); + + /* We need to free the output's name after us if it is not explicitly requested */ + free_name = !(fields & LIBGAMMA_CRTC_INFO_CONNECTOR_NAME); + + /* Jump if the output information is not required */ + if (!(fields & (LIBGAMMA_CRTC_INFO_MACRO_ACTIVE | LIBGAMMA_CRTC_INFO_MACRO_CONNECTOR))) + goto cont; + + /* Get connector and connector information */ + connection = crtc->partition->site->data; + screen_data = crtc->partition->data; + output_index = screen_data->crtc_to_output[crtc->crtc]; + /* `SIZE_MAX` is used for CRTC:s that misses mapping to its output (should not happen), + * because `SIZE_MAX - 1` is the highest theoretical possible value */ + if (output_index == SIZE_MAX) { + e |= this->edid_error = this->gamma_error = this->width_mm_edid_error + = this->height_mm_edid_error = this->connector_type_error + = this->connector_name_error = this->subpixel_order_error + = this->width_mm_error = this->height_mm_error + = this->active_error = LIBGAMMA_CONNECTOR_UNKNOWN; + goto cont; + } + /* Get the output */ + output = screen_data->outputs[output_index]; + /* Query output information */ + cookie = xcb_randr_get_output_info(connection, output, screen_data->config_timestamp); + output_info = xcb_randr_get_output_info_reply(connection, cookie, &error); + if (error) { + e |= this->edid_error = this->gamma_error = this->width_mm_edid_error + = this->height_mm_edid_error = this->connector_type_error + = this->connector_name_error = this->subpixel_order_error + = this->width_mm_error = this->height_mm_error + = this->active_error = LIBGAMMA_OUTPUT_INFORMATION_QUERY_FAILED; + goto cont; + } + + /* Get connector name */ + e |= get_output_name(this, output_info); + /* Get connector type */ + if (fields & LIBGAMMA_CRTC_INFO_CONNECTOR_TYPE) + e |= get_connector_type(this); + /* Get additional output data, excluding EDID */ + e |= read_output_data(this, output_info); + if (fields & LIBGAMMA_CRTC_INFO_MACRO_VIEWPORT) + e |= this->width_mm_error | this->height_mm_error; + e |= (fields & LIBGAMMA_CRTC_INFO_SUBPIXEL_ORDER) ? this->subpixel_order_error : 0; + + /* If we do not want any EDID information, jump */ + if (!(fields & LIBGAMMA_CRTC_INFO_MACRO_EDID)) + goto cont; + /* If there is not monitor that report error in EDID related fields */ + if (!this->active) { + e |= this->edid_error = this->gamma_error = this->width_mm_edid_error + = this->height_mm_edid_error = LIBGAMMA_NOT_CONNECTED; + goto cont; + } + /* Get EDID */ + e |= get_edid(this, crtc, output); + if (!this->edid) { + this->gamma_error = this->width_mm_edid_error = this->height_mm_edid_error = this->edid_error; + goto cont; + } + /* Parse EDID */ + if ((fields & (LIBGAMMA_CRTC_INFO_MACRO_EDID ^ LIBGAMMA_CRTC_INFO_EDID))) + e |= libgamma_parse_edid(this, fields); + +cont: + /* Get gamma ramp size */ + e |= (fields & LIBGAMMA_CRTC_INFO_GAMMA_SIZE) ? get_gamma_ramp_size(this, crtc) : 0; + /* Store gamma ramp depth. */ + this->gamma_depth = 16; + /* X RandR does not support quering gamma ramp support. */ + e |= this->gamma_support_error = _E(LIBGAMMA_CRTC_INFO_GAMMA_SUPPORT); + + /* Free the EDID after us */ + if (free_edid) { + free(this->edid); + this->edid = NULL; + } + /* Free the output name after us */ + if (free_name) { + free(this->connector_name); + this->connector_name = NULL; + } + + free(output_info); + return e ? -1 : 0; + #undef _E } /** - * Get the current gamma ramps for a CRTC, 16-bit gamma-depth version. + * Get the current gamma ramps for a CRTC, 16-bit gamma-depth 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 * @return Zero on success, otherwise (negative) the value of an - * error identifier provided by this library. + * error identifier provided by this library */ -int libgamma_x_randr_crtc_get_gamma_ramps16(libgamma_crtc_state_t* restrict this, - libgamma_gamma_ramps16_t* restrict ramps) +int +libgamma_x_randr_crtc_get_gamma_ramps16(libgamma_crtc_state_t *restrict this, libgamma_gamma_ramps16_t *restrict ramps) { - xcb_connection_t* restrict connection = this->partition->site->data; - xcb_randr_get_crtc_gamma_cookie_t cookie; - xcb_randr_get_crtc_gamma_reply_t* restrict reply; - xcb_generic_error_t* error; - uint16_t* restrict red; - uint16_t* restrict green; - uint16_t* restrict blue; + xcb_connection_t *restrict connection = this->partition->site->data; + xcb_randr_get_crtc_gamma_cookie_t cookie; + xcb_randr_get_crtc_gamma_reply_t *restrict reply; + xcb_generic_error_t *error; + uint16_t *restrict red; + uint16_t *restrict green; + uint16_t *restrict blue; #ifdef DEBUG - /* Gamma ramp sizes are identical but not fixed. */ - if ((ramps->red_size != ramps->green_size) || - (ramps->red_size != ramps->blue_size)) - return LIBGAMMA_MIXED_GAMMA_RAMP_SIZE; + /* Gamma ramp sizes are identical but not fixed */ + if (ramps->red_size != ramps->green_size || ramps->red_size != ramps->blue_size) + return LIBGAMMA_MIXED_GAMMA_RAMP_SIZE; #endif - - /* Read current gamma ramps. */ - cookie = xcb_randr_get_crtc_gamma(connection, *(xcb_randr_crtc_t*)(this->data)); - reply = xcb_randr_get_crtc_gamma_reply(connection, cookie, &error); - - /* Check for errors. */ - if (error != NULL) - return translate_error(error->error_code, LIBGAMMA_GAMMA_RAMP_READ_FAILED, 0); - - /* Get current gamma ramps from response. */ - red = xcb_randr_get_crtc_gamma_red(reply); - green = xcb_randr_get_crtc_gamma_green(reply); - blue = xcb_randr_get_crtc_gamma_blue(reply); - /* Copy over the gamma ramps to our memory. */ - memcpy(ramps->red, red, ramps->red_size * sizeof(uint16_t)); - memcpy(ramps->green, green, ramps->green_size * sizeof(uint16_t)); - memcpy(ramps->blue, blue, ramps->blue_size * sizeof(uint16_t)); - - free(reply); - return 0; + + /* Read current gamma ramps */ + cookie = xcb_randr_get_crtc_gamma(connection, *(xcb_randr_crtc_t *)this->data); + reply = xcb_randr_get_crtc_gamma_reply(connection, cookie, &error); + + /* Check for errors */ + if (error) + return translate_error(error->error_code, LIBGAMMA_GAMMA_RAMP_READ_FAILED, 0); + + /* Get current gamma ramps from response */ + red = xcb_randr_get_crtc_gamma_red(reply); + green = xcb_randr_get_crtc_gamma_green(reply); + blue = xcb_randr_get_crtc_gamma_blue(reply); + /* Copy over the gamma ramps to our memory */ + memcpy(ramps->red, red, ramps->red_size * sizeof(uint16_t)); + memcpy(ramps->green, green, ramps->green_size * sizeof(uint16_t)); + memcpy(ramps->blue, blue, ramps->blue_size * sizeof(uint16_t)); + + free(reply); + return 0; } /** - * Set the gamma ramps for a CRTC, 16-bit gamma-depth version. + * Set the gamma ramps for a CRTC, 16-bit gamma-depth 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 * @return Zero on success, otherwise (negative) the value of an - * error identifier provided by this library. + * error identifier provided by this library */ -int libgamma_x_randr_crtc_set_gamma_ramps16(libgamma_crtc_state_t* restrict this, - libgamma_gamma_ramps16_t ramps) +int +libgamma_x_randr_crtc_set_gamma_ramps16(libgamma_crtc_state_t *restrict this, libgamma_gamma_ramps16_t ramps) { - xcb_connection_t* restrict connection = this->partition->site->data; - xcb_void_cookie_t cookie; - xcb_generic_error_t* restrict error; + xcb_connection_t *restrict connection = this->partition->site->data; + xcb_void_cookie_t cookie; + xcb_generic_error_t *restrict error; #ifdef DEBUG - /* Gamma ramp sizes are identical but not fixed. */ - if ((ramps.red_size != ramps.green_size) || - (ramps.red_size != ramps.blue_size)) - return LIBGAMMA_MIXED_GAMMA_RAMP_SIZE; + /* Gamma ramp sizes are identical but not fixed */ + if (ramps.red_size != ramps.green_size || ramps.red_size != ramps.blue_size) + return LIBGAMMA_MIXED_GAMMA_RAMP_SIZE; #endif - - /* Apply gamma ramps. */ - cookie = xcb_randr_set_crtc_gamma_checked(connection, *(xcb_randr_crtc_t*)(this->data), - (uint16_t)(ramps.red_size), ramps.red, ramps.green, ramps.blue); - /* Check for errors. */ - if ((error = xcb_request_check(connection, cookie)) != NULL) - return translate_error(error->error_code, LIBGAMMA_GAMMA_RAMP_WRITE_FAILED, 0); - return 0; + + /* Apply gamma ramps */ + cookie = xcb_randr_set_crtc_gamma_checked(connection, *(xcb_randr_crtc_t*)this->data, + (uint16_t)ramps.red_size, ramps.red, ramps.green, ramps.blue); + /* Check for errors */ + error = xcb_request_check(connection, cookie); + if (error) + return translate_error(error->error_code, LIBGAMMA_GAMMA_RAMP_WRITE_FAILED, 0); + return 0; } -#ifdef __GCC__ +#ifdef __GNUC__ # pragma GCC diagnostic pop #endif - |