/**
* libgamma — Display server abstraction layer for gamma ramp adjustments
* Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "libgamma-facade.h"
#include "libgamma-method.h"
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
/**
* Return the capabilities of an adjustment method
*
* @param this The data structure to fill with the method's capabilities
* @param method The adjustment method (display server and protocol)
*/
void libgamma_method_capabilities(libgamma_method_capabilities_t* restrict this, int method)
{
/* TODO */
}
/**
* Return the capabilities of an adjustment method
*
* @param method The adjustment method (display server and protocol)
* @return The default site, `NULL` if it cannot be determined or
* if multiple sites are not supported by the adjustment
* method. This value should not be free:d.
*/
char* libgamma_method_default_site(int method)
{
const char* var = libgamma_method_default_site_variable(method);
char* env;
if (var == NULL)
return NULL;
env = getenv(var);
if ((env == NULL) || (*env == '\0'))
return NULL;
return env;
}
/**
* Return the capabilities of an adjustment method
*
* @param method The adjustment method (display server and protocol)
* @return The environ variables that is used to determine the
* default site. `NULL` if there is none, that is, if
* the method does not support multiple sites.
* This value should not be free:d.
*/
const char* libgamma_method_default_site_variable(int method)
{
/* TODO */
}
/**
* Initialise an allocated site state
*
* @param this The site state to initialise
* @param method The adjustment method (display server and protocol)
* @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.
* @return Zero on success, otherwise (negative) the value of an
* error identifier provided by this library
*/
int libgamma_site_initialise(libgamma_site_state_t* restrict this,
int method, char* restrict site)
{
/* TODO */
}
/**
* Release all resources held by a site state
*
* @param this The site state
*/
void libgamma_site_destroy(libgamma_site_state_t* restrict this)
{
/* TODO */
}
/**
* Release all resources held by a site state
* and free the site state pointer
*
* @param this The site state
*/
void libgamma_site_free(libgamma_site_state_t* restrict this)
{
libgamma_site_destroy(this);
free(this);
}
/**
* Restore the gamma ramps all CRTCS 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_site_restore(libgamma_site_state_t* restrict this)
{
/* TODO */
}
/**
* 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_partition_initialise(libgamma_partition_state_t* restrict this,
libgamma_site_state_t* restrict site, size_t partition)
{
/* TODO */
}
/**
* Release all resources held by a partition state
*
* @param this The partition state
*/
void libgamma_partition_destroy(libgamma_partition_state_t* restrict this)
{
/* TODO */
}
/**
* Release all resources held by a partition state
* and free the partition state pointer
*
* @param this The partition state
*/
void libgamma_partition_free(libgamma_partition_state_t* restrict this)
{
libgamma_partition_destroy(this);
free(this);
}
/**
* Restore the gamma ramps all CRTCS 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_partition_restore(libgamma_site_state_t* restrict this)
{
/* TODO */
}
/**
* 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_crtc_initialise(libgamma_crtc_state_t* restrict this,
libgamma_partition_state_t* restrict partition, size_t crtc)
{
/* TODO */
}
/**
* Release all resources held by a CRTC state
*
* @param this The CRTC state
*/
void libgamma_crtc_destroy(libgamma_crtc_state_t* restrict this)
{
/* TODO */
}
/**
* Release all resources held by a CRTC state
* and free the CRTC state pointer
*
* @param this The CRTC state
*/
void libgamma_crtc_free(libgamma_crtc_state_t* restrict this)
{
libgamma_crtc_destroy(this);
free(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_crtc_restore(libgamma_site_state_t* restrict this)
{
/* TODO */
}
/**
* 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 field 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_get_crtc_information(libgamma_crtc_information_t* restrict this,
libgamma_crtc_state_t* restrict crtc, int32_t field)
{
/* TODO */
}
/**
* Release all resources in an information data structure for a CRTC
*
* @param this The CRTC information
*/
int libgamma_crtc_information_destroy(libgamma_crtc_information_t* restrict this)
{
/* TODO */
}
/**
* Release all resources in an information data structure for a CRTC
* and free the data structure pointer
*
* @param this The CRTC information
*/
int libgamma_crtc_information_free(libgamma_crtc_information_t* restrict this)
{
libgamma_crtc_information_destroy(this);
free(this);
}
/**
* Convert a raw representation of an EDID to a lowercase hexadecimal representation
*
* @param edid The EDID in raw representation
* @param length The length of `edid`
* @retrun The EDID in lowercase hexadecimal representation,
* `NULL` on allocation error, `errno` will be set accordingly
*/
char* libgamma_behex_edid_lowercase(const unsigned char* restrict edid, size_t length)
{
char* out = malloc((length * 2 + 1) * sizeof(char));
size_t i;
if (out == NULL)
return NULL;
for (i = 0; i < length; i++)
{
out[i * 2 + 0] = "0123456789abcdef"[(edid[i] >> 4) & 15];
out[i * 2 + 1] = "0123456789abcdef"[(edid[i] >> 0) & 15];
}
out[length * 2] = '\0';
return out;
}
/**
* Convert a raw representation of an EDID to an uppercase hexadecimal representation
*
* @param edid The EDID in raw representation
* @param length The length of `edid`
* @retrun The EDID in uppercase hexadecimal representation,
* NULL` on allocation error, `errno` will be set accordingly
*/
char* libgamma_behex_edid_uppercase(const unsigned char* restrict edid, size_t length)
{
char* out = malloc((length * 2 + 1) * sizeof(char));
size_t i;
if (out == NULL)
return NULL;
for (i = 0; i < length; i++)
{
out[i * 2 + 0] = "0123456789ABCDEF"[(edid[i] >> 4) & 15];
out[i * 2 + 1] = "0123456789ABCDEF"[(edid[i] >> 0) & 15];
}
out[length * 2] = '\0';
return out;
}
/**
* Convert an hexadecimal representation of an EDID to a raw representation
*
* @param edid The EDID in hexadecimal representation
* @retrun The EDID in raw representation, it will be half the length
* of `edid` (the input value). `NULL` on allocation error or
* if the EDID is malformated, `errno` will be set accordingly.
*/
unsigned char* libgamma_unhex_edid(const char* restrict edid)
{
#define not_range(lower, V, upper) ((V < lower) || (upper < V))
#define is_not_hex(V) (not_range('0', V, '9') && not_range('a', V, 'f') && not_range('A', V, 'F'))
unsigned char* out = NULL;
size_t n = strlen(edid);
size_t i;
if ((n & 1))
return errno = EINVAL, NULL;
out = malloc(n / 2 * sizeof(unsigned char));
if (out == NULL)
return NULL;
for (i = 0; i < n; i++)
{
char a = edid[i * 2 + 0];
char b = edid[i * 2 + 1];
if (is_not_hex(a) || is_not_hex(b))
{
free(out);
return errno = EINVAL, NULL;
}
a = (char)((a & 15) + (a > '9' ? 9 : 0));
b = (char)((b & 15) + (b > '9' ? 9 : 0));
out[i] = (unsigned char)((a << 4) | b);
}
return out;
#undef is_hex
#undef not_range
}
/**
* Set the gamma ramps for a CRTC, 16-bit gamma-depth version
*
* @param this The CRTC state
* @parma ramps The gamma ramps to apply
* @return Zero on success, otherwise (negative) the value of an
* error identifier provided by this library
*/
int libgamma_crtc_set_gamma_ramps(libgamma_crtc_state_t* restrict this,
libgamma_gamma_ramps_t ramps)
{
/* TODO */
}
/**
* Get current the gamma ramps for a CRTC, 16-bit gamma-depth version
*
* @param this The CRTC state
* @parma 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_crtc_get_gamma_ramps(libgamma_crtc_state_t* restrict this,
libgamma_gamma_ramps_t* restrict ramps)
{
/* TODO */
}
/**
* Set the gamma ramps for a CRTC, 32-bit gamma-depth version
*
* @param this The CRTC state
* @parma ramps The gamma ramps to apply
* @return Zero on success, otherwise (negative) the value of an
* error identifier provided by this library
*/
int libgamma_crtc_set_gamma_ramps32(libgamma_crtc_state_t* restrict this,
libgamma_gamma_ramps32_t ramps)
{
/* TODO */
}
/**
* Get current the gamma ramps for a CRTC, 32-bit gamma-depth version
*
* @param this The CRTC state
* @parma 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_crtc_get_gamma_ramps32(libgamma_crtc_state_t* restrict this,
libgamma_gamma_ramps32_t* restrict ramps)
{
/* TODO */
}
/**
* Set the gamma ramps for a CRTC, 64-bit gamma-depth version
*
* @param this The CRTC state
* @parma ramps The gamma ramps to apply
* @return Zero on success, otherwise (negative) the value of an
* error identifier provided by this library
*/
int libgamma_crtc_set_gamma_ramps64(libgamma_crtc_state_t* restrict this,
libgamma_gamma_ramps64_t ramps)
{
/* TODO */
}
/**
* Get current the gamma ramps for a CRTC, 64-bit gamma-depth version
*
* @param this The CRTC state
* @parma 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_crtc_get_gamma_ramps64(libgamma_crtc_state_t* restrict this,
libgamma_gamma_ramps64_t* restrict ramps)
{
/* TODO */
}
