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Diffstat (limited to 'src/lib/gamma-x-randr.c')
| -rw-r--r-- | src/lib/gamma-x-randr.c | 916 |
1 files changed, 916 insertions, 0 deletions
diff --git a/src/lib/gamma-x-randr.c b/src/lib/gamma-x-randr.c new file mode 100644 index 0000000..9870f6b --- /dev/null +++ b/src/lib/gamma-x-randr.c @@ -0,0 +1,916 @@ +/** + * 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/>. + */ +#ifndef HAVE_LIBGAMMA_METHOD_X_RANDR +# error Compiling gamma-x-randr.c without HAVE_LIBGAMMA_METHOD_X_RANDR +#endif + +#include "gamma-x-randr.h" + +#include "libgamma-error.h" +#include "edid.h" + +#include <stdlib.h> +#include <errno.h> +#include <string.h> +#include <stdint.h> +#ifdef DEBUG +# include <stdio.h> +#endif + +#include <xcb/xcb.h> +#include <xcb/randr.h> + + +/** + * The major version of RandR the library expects. + */ +#define RANDR_VERSION_MAJOR 1 + +/** + * The minor version of RandR the library expects. + */ +#define RANDR_VERSION_MINOR 3 + + + +/** + * 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; + +} libgamma_x_randr_partition_data_t; + + + +/** + * 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. + */ +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; + } +} + + +/** + * 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. + */ +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; +} + + +/** + * Return the capabilities of the adjustment method. + * + * @param this The data structure to fill with the method's capabilities. + */ +void libgamma_x_randr_method_capabilities(libgamma_method_capabilities_t* restrict this) +{ + char* display = getenv("DISPLAY"); + this->crtc_information = LIBGAMMA_CRTC_INFO_EDID + | LIBGAMMA_CRTC_INFO_WIDTH_MM + | LIBGAMMA_CRTC_INFO_HEIGHT_MM + | LIBGAMMA_CRTC_INFO_WIDTH_MM_EDID + | LIBGAMMA_CRTC_INFO_HEIGHT_MM_EDID + | LIBGAMMA_CRTC_INFO_GAMMA_SIZE + | LIBGAMMA_CRTC_INFO_GAMMA_DEPTH + | LIBGAMMA_CRTC_INFO_SUBPIXEL_ORDER + | LIBGAMMA_CRTC_INFO_CONNECTOR_NAME + | LIBGAMMA_CRTC_INFO_CONNECTOR_TYPE + | LIBGAMMA_CRTC_INFO_GAMMA; + this->default_site_known = (display && *display) ? 1 : 0; + this->multiple_sites = 1; + this->multiple_partitions = 1; + this->multiple_crtcs = 1; + this->partitions_are_graphics_cards = 0; + this->site_restore = 0; + this->partition_restore = 0; + this->crtc_restore = 0; + this->identical_gamma_sizes = 1; + this->fixed_gamma_size = 0; + this->fixed_gamma_depth = 1; + this->real = 1; + this->fake = 0; +} + + +# pragma GCC diagnostic push +# pragma GCC diagnostic ignored "-Waggregate-return" + + +/** + * Initialise an allocated site state. + * + * @param this The site state to initialise. + * @param site The site identifier, unless it is `NULL` it must a + * `free`:able. One the state is destroyed the library + * will attempt to free it. There you should not free + * it yourself, and it must not be a string constant + * 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. + */ +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; + + this->data = connection = xcb_connect(site, NULL); + if (connection == NULL) + return LIBGAMMA_NO_SUCH_SITE; + + cookie = xcb_randr_query_version(connection, RANDR_VERSION_MAJOR, RANDR_VERSION_MINOR); + reply = xcb_randr_query_version_reply(connection, cookie, &error); + + if ((error != NULL) || (reply == NULL)) + { + free(reply); + xcb_disconnect(connection); + if (error != NULL) + return translate_error(error->error_code, LIBGAMMA_PROTOCOL_VERSION_QUERY_FAILED, 0); + return LIBGAMMA_PROTOCOL_VERSION_QUERY_FAILED; + } + + if ((reply->major_version != RANDR_VERSION_MAJOR) || + (reply->minor_version < RANDR_VERSION_MINOR)) + { +#ifdef DEBUG + fprintf(stderr, "libgamma: RandR protocol version: %u.%u", reply->major_version, reply->minor_version); +#endif + free(reply); + xcb_disconnect(connection); + return LIBGAMMA_PROTOCOL_VERSION_NOT_SUPPORTED; + } + + free(reply); + + if ((setup = xcb_get_setup(connection)) == NULL) + { + xcb_disconnect(connection); + return LIBGAMMA_LIST_PARTITIONS_FAILED; + } + iter = xcb_setup_roots_iterator(setup); + this->partitions_available = (size_t)(iter.rem); + + return iter.rem < 0 ? LIBGAMMA_NEGATIVE_PARTITION_COUNT : 0; +} + + +/** + * Release all resources held by a site state. + * + * @param this The site state. + */ +void libgamma_x_randr_site_destroy(libgamma_site_state_t* restrict this) +{ + xcb_disconnect((xcb_connection_t*)(this->data)); +} + + +/** + * Restore the gamma ramps all CRTC:s with a site to the system settings. + * + * @param this The site state. + * @return Zero on success, otherwise (negative) the value of an + * error identifier provided by this library. + */ +int libgamma_x_randr_site_restore(libgamma_site_state_t* restrict this) +{ + (void) this; + return errno = ENOTSUP, LIBGAMMA_ERRNO_SET; +} + + +/** + * 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. + */ +static inline void* memdup(void* restrict ptr, size_t bytes) +{ + char* restrict rc; + if (bytes == 0) + return NULL; + if ((rc = malloc(bytes)) == NULL) + return NULL; + memcpy(rc, ptr, bytes); + return rc; +} + + +/** + * Initialise an allocated partition state. + * + * @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. + * @return Zero on success, otherwise (negative) the value of an + * 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 fail_rc = LIBGAMMA_ERRNO_SET; + xcb_connection_t* restrict connection = site->data; + const xcb_setup_t* restrict setup = xcb_get_setup(connection); + xcb_screen_t* restrict screen = NULL; + xcb_generic_error_t* error = NULL; + 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; + + if (setup == NULL) + return LIBGAMMA_LIST_PARTITIONS_FAILED; + + for (i = 0; iter.rem > 0; i++, xcb_screen_next(&iter)) + if (i == partition) + { + screen = iter.data; + break; + } + if (iter.rem == 0) + return LIBGAMMA_NO_SUCH_PARTITION; + + if (screen == NULL) + return LIBGAMMA_NULL_PARTITION; + + 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); + + this->crtcs_available = reply->num_crtcs; + crtcs = xcb_randr_get_screen_resources_current_crtcs(reply); + outputs = xcb_randr_get_screen_resources_current_outputs(reply); + if ((crtcs == NULL) || (outputs == NULL)) + { + free(reply); + return LIBGAMMA_REPLY_VALUE_EXTRACTION_FAILED; + } + + /* 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 == 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; + + data->outputs_count = (size_t)(reply->num_outputs); + + data->crtc_to_output = malloc((size_t)(reply->num_crtcs) * sizeof(size_t)); + if (data->crtc_to_output == NULL) + goto fail; + for (i = 0; i < (size_t)(reply->num_crtcs); i++) + data->crtc_to_output[i] = SIZE_MAX; + 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; + + 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; + } + + for (j = 0; j < reply->num_crtcs; j++) + if (crtcs[j] == out_reply->crtc) + { + data->crtc_to_output[j] = i; + break; + } + + free(out_reply); + } + + data->config_timestamp = reply->config_timestamp; + this->data = data; + free(reply); + return 0; + + fail: + if (data != NULL) + { + 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. + * + * @param this The partition state. + */ +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); +} + + +/** + * Restore the gamma ramps all CRTC:s with a partition to the system settings. + * + * @param this The partition state. + * @return Zero on success, otherwise (negative) the value of an + * error identifier provided by this library. + */ +int libgamma_x_randr_partition_restore(libgamma_partition_state_t* restrict this) +{ + (void) this; + return errno = ENOTSUP, LIBGAMMA_ERRNO_SET; +} + + + +/** + * Initialise an allocated CRTC state. + * + * @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. + * @return Zero on success, otherwise (negative) the value of an + * 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) +{ + libgamma_x_randr_partition_data_t* restrict screen_data = partition->data; + xcb_randr_crtc_t* restrict crtc_ids = screen_data->crtcs; + if (crtc >= partition->crtcs_available) + return LIBGAMMA_NO_SUCH_CRTC; + this->data = crtc_ids + crtc; + return 0; +} + + +/** + * Release all resources held by a CRTC state. + * + * @param this The CRTC state. + */ +void libgamma_x_randr_crtc_destroy(libgamma_crtc_state_t* restrict this) +{ + (void) this; +} + + +/** + * Restore the gamma ramps for a CRTC to the system settings for that CRTC. + * + * @param this The CRTC state. + * @return Zero on success, otherwise (negative) the value of an + * error identifier provided by this library. + */ +int libgamma_x_randr_crtc_restore(libgamma_crtc_state_t* restrict this) +{ + (void) this; + return errno = ENOTSUP, LIBGAMMA_ERRNO_SET; +} + + + +/** + * 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. + */ +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; + + 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); + if (reply->size < 2) + out->gamma_size_error = LIBGAMMA_SINGLETON_GAMMA_RAMP; + out->red_gamma_size = out->green_gamma_size = out->blue_gamma_size = reply->size; + free(reply); + return out->gamma_size_error; +} + + +/** + * 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. + */ +static int read_output_data(libgamma_crtc_information_t* restrict out, xcb_randr_get_output_info_reply_t* restrict output) +{ + switch (output->connection) + { + case XCB_RANDR_CONNECTION_CONNECTED: + out->active = 1; + out->width_mm = output->mm_width; + out->height_mm = output->mm_height; +#define __select(value) \ + case XCB_RENDER_SUB_PIXEL_##value: out->subpixel_order = LIBGAMMA_SUBPIXEL_ORDER_##value; break + 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; + } +#undef __select + return 0; + + case XCB_RANDR_CONNECTION_DISCONNECTED: + out->active = 0; + out->width_mm_error = LIBGAMMA_NOT_CONNECTED; + out->height_mm_error = LIBGAMMA_NOT_CONNECTED; + out->subpixel_order_error = LIBGAMMA_NOT_CONNECTED; + return 0; + + default: + out->active = 0; + out->active_error = LIBGAMMA_STATE_UNKNOWN; + out->width_mm_error = LIBGAMMA_NOT_CONNECTED; + out->height_mm_error = LIBGAMMA_NOT_CONNECTED; + out->subpixel_order_error = LIBGAMMA_NOT_CONNECTED; + return -1; + } +} + + +/** + * Determine the connector type from the connector name. + * + * @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) +{ + 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 + + __select ("None", Unknown); + __select ("VGA", VGA); + __select ("DVI-I", DVII); + __select ("DVI-D", DVID); + __select ("DVI-A", DVIA); + __select ("Composite", Composite); + __select ("S-Video", SVIDEO); + __select ("Component", Component); + __select ("LFP", LFP); + __select ("Proprietary", Unknown); + __select ("HDMI", HDMI); + __select ("DisplayPort", DisplayPort); + +#undef __select + + this->connector_name_error = LIBGAMMA_CONNECTOR_TYPE_NOT_RECOGNISED; + return -1; +} + + +/** + * 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. + */ +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; + + name = xcb_randr_get_output_info_name(output); + length = output->name_len; /* There is no NUL-termination. */ + if (name == NULL) + { + out->connector_name_error = LIBGAMMA_REPLY_VALUE_EXTRACTION_FAILED; + return -1; + } + + store = malloc(((size_t)length + 1) * sizeof(char)); + if (store == NULL) + { + 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. + * + * @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) +{ + 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) + { + free(prop_reply); + return 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; + } + + /* 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; + } + + /* Store the EDID. */ + 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)); + + free(atom_reply); + free(atom_name_reply); + free(prop_reply); + + return out->edid_error; + } + + return out->edid_error = LIBGAMMA_EDID_NOT_FOUND; +} + + +/** + * 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`.. + */ +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; + + /* 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; + + /* Figure out what fields we need to get the data for to get the data for other fields. */ + if ((fields & (LIBGAMMA_CRTC_INFO_WIDTH_MM_EDID | LIBGAMMA_CRTC_INFO_HEIGHT_MM_EDID | LIBGAMMA_CRTC_INFO_GAMMA))) + fields |= LIBGAMMA_CRTC_INFO_EDID; + if ((fields & LIBGAMMA_CRTC_INFO_CONNECTOR_TYPE)) + fields |= LIBGAMMA_CRTC_INFO_CONNECTOR_NAME; + if ((fields & (LIBGAMMA_CRTC_INFO_WIDTH_MM | LIBGAMMA_CRTC_INFO_HEIGHT_MM | LIBGAMMA_CRTC_INFO_SUBPIXEL_ORDER))) + fields |= LIBGAMMA_CRTC_INFO_ACTIVE; + + /* Jump if the output information is not required. */ + if ((fields & (LIBGAMMA_CRTC_INFO_ACTIVE | LIBGAMMA_CRTC_INFO_CONNECTOR_NAME)) == 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; + 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; + } + output = screen_data->outputs[output_index]; + 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; + } + } + + e |= get_output_name(this, output_info); + if ((fields & LIBGAMMA_CRTC_INFO_CONNECTOR_TYPE)) + e |= get_connector_type(this); + e |= read_output_data(this, output_info); + if ((fields & (LIBGAMMA_CRTC_INFO_WIDTH_MM | LIBGAMMA_CRTC_INFO_HEIGHT_MM))) + e |= this->width_mm_error | this->height_mm_error; + e |= (fields & LIBGAMMA_CRTC_INFO_SUBPIXEL_ORDER) ? this->subpixel_order_error : 0; + + if ((fields & LIBGAMMA_CRTC_INFO_EDID) == 0) + goto cont; + 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; + } + 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; + } + if ((fields & (LIBGAMMA_CRTC_INFO_WIDTH_MM_EDID | LIBGAMMA_CRTC_INFO_HEIGHT_MM_EDID | LIBGAMMA_CRTC_INFO_GAMMA))) + e |= libgamma_parse_edid(this, fields); + + cont: + e |= (fields & LIBGAMMA_CRTC_INFO_GAMMA_SIZE) ? get_gamma_ramp_size(this, crtc) : 0; + this->gamma_depth = 16; + 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(output_info); + return e ? -1 : 0; +#undef _E +} + + +/** + * Get current the 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. + * @return Zero on success, otherwise (negative) the value of an + * error identifier provided by this library. + */ +int libgamma_x_randr_crtc_get_gamma_ramps(libgamma_crtc_state_t* restrict this, + libgamma_gamma_ramps_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; + +#ifdef DEBUG + if ((ramps->red_size != ramps->green_size) || + (ramps->red_size != ramps->blue_size)) + return LIBGAMMA_MIXED_GAMMA_RAMP_SIZE; +#endif + + cookie = xcb_randr_get_crtc_gamma(connection, *(xcb_randr_crtc_t*)(this->data)); + reply = xcb_randr_get_crtc_gamma_reply(connection, cookie, &error); + + if (error != NULL) + return translate_error(error->error_code, LIBGAMMA_GAMMA_RAMP_READ_FAILED, 0); + + red = xcb_randr_get_crtc_gamma_red(reply); + green = xcb_randr_get_crtc_gamma_green(reply); + blue = xcb_randr_get_crtc_gamma_blue(reply); + 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. + * + * @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. + */ +int libgamma_x_randr_crtc_set_gamma_ramps(libgamma_crtc_state_t* restrict this, + libgamma_gamma_ramps_t ramps) +{ + xcb_connection_t* restrict connection = this->partition->site->data; + xcb_void_cookie_t cookie; + xcb_generic_error_t* restrict error; +#ifdef DEBUG + if ((ramps.red_size != ramps.green_size) || + (ramps.red_size != ramps.blue_size)) + return LIBGAMMA_MIXED_GAMMA_RAMP_SIZE; +#endif + 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); + if ((error = xcb_request_check(connection, cookie)) != NULL) + return translate_error(error->error_code, LIBGAMMA_GAMMA_RAMP_WRITE_FAILED, 0); + return 0; +} + + +# pragma GCC diagnostic pop + |