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authorMattias Andrée <maandree@operamail.com>2014-05-31 07:32:09 +0200
committerMattias Andrée <maandree@operamail.com>2014-05-31 07:32:09 +0200
commitbdeb7f77f16b1e482904866ff21e43f8bfc01bb0 (patch)
treee5587a577db53a58ea52fd2579fa0cbb89007491 /src/lib/gamma-x-randr.c
parentsplit out error identification for failure of open from libgamma_linux_drm_partition_initialise (diff)
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move files around
Signed-off-by: Mattias Andrée <maandree@operamail.com>
Diffstat (limited to 'src/lib/gamma-x-randr.c')
-rw-r--r--src/lib/gamma-x-randr.c916
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
+