/* -*- c -*- */
/**
* 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/>.
*/
#include "libgamma-facade.h"
#include "libgamma-error.h"
#include "libgamma-method.h"
#include "gamma-helper.h"
/* Initialise the general preprocessor. */
$>cd src/extract
$>export PATH=".:${PATH}"
/* Some general preprocessor we will use frequently. */
$<
get-methods ()
{ ./libgamma-method-extract --list --method | cut -d _ -f 1,2 --complement
}
lowercase ()
{ echo "$*" | sed -e y/QWERTYUIOPASDFGHJKLZXCVBNM/qwertyuiopasdfghjklzxcvbnm/ | sed -e s:core_graphics:cg:g
}
$>
/* Include all adjustment methods that
are enabled at compile-time. */
$>for method in $(get-methods); do
#ifdef HAVE_LIBGAMMA_METHOD_${method}
# include "gamma-$(lowercase $method | sed -e s:_:-:g).h"
# ifndef HAVE_LIBGAMMA_METHODS
# define HAVE_LIBGAMMA_METHODS
# endif
#endif
$>done
#include <unistd.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
/* Some things to reduce warnings when we do
not have any adjustment methods enabled. */
#ifndef HAVE_LIBGAMMA_METHODS
# define HAVE_NO_LIBGAMMA_METHODS
# ifdef __GCC__
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wsuggest-attribute=const"
# endif
#endif
#ifdef HAVE_LIBGAMMA_METHODS
# ifdef HAVE_LIBGAMMA_METHOD_LINUX_DRM
/**
* Test whether a file descriptor refers to a VT.
*
* @param fd The file descriptor.
* @return Whether the file descriptor refers to a VT.
*/
static int libgamma_is_vt_proper(int fd)
{
char buf[32];
char digit0;
/* Get TTY. */
if (ttyname_r(fd, buf, sizeof(buf) / sizeof(char)))
return 0;
/* Validate TTY path. */
if (!strcmp(buf, "/dev/console"))
return 1;
if (strstr(buf, "/dev/tty") != buf)
return 0;
/* Validate TTY name. */
digit0 = buf[strlen("/dev/tty")];
return ('1' <= digit0) && (digit0 <= '9');
}
# endif
/**
* Test the availability of an adjustment method.
*
* @param method The adjustment method.
* @param operation Allowed values:
* 0: Pass if the environment suggests it will work but is not fake.
* 1: Pass if the environment suggests it will work.
* 2: Pass if real and not fake.
* 3: Pass if real.
* 4: Always pass.
* Other values invoke undefined behaviour.
* @return Whether the test passed.
*/
static int libgamma_list_method_test(int method, int operation)
{
libgamma_method_capabilities_t caps;
libgamma_method_capabilities(&caps, method);
switch (operation)
{
case 0:
/* Methods that the environment suggests will work, excluding fake. */
if (caps.fake)
return 0;
/* Fall through. */
case 1:
/* Methods that the environment suggests will work, including fake. */
if (caps.real == 0)
return 0;
#ifdef HAVE_LIBGAMMA_METHOD_LINUX_DRM
if (method == LIBGAMMA_METHOD_LINUX_DRM)
return libgamma_is_vt_proper(STDIN_FILENO) ||
libgamma_is_vt_proper(STDOUT_FILENO) ||
libgamma_is_vt_proper(STDERR_FILENO);
#endif
#ifdef HAVE_LIBGAMMA_METHOD_DUMMY
if (method == LIBGAMMA_METHOD_DUMMY)
return 0;
#endif
return caps.default_site_known;
case 2:
/* All real non-fake methods. */
return caps.real && (caps.fake == 0);
case 3:
/* All real methods. */
return caps.real;
default:
/* All methods. */
return 1;
}
}
#endif
/**
* List available adjustment methods by their order of preference based on the environment.
*
* @param methods Output array of methods, should be able to hold `LIBGAMMA_METHOD_COUNT` elements.
* @param buf_size The number of elements that fits in `methods`, it should be `LIBGAMMA_METHOD_COUNT`,
* This is used to avoid writing outside the output buffer if this library adds new
* adjustment methods without the users of the library recompiling.
* @param operation Allowed values:
* 0: Methods that the environment suggests will work, excluding fake.
* 1: Methods that the environment suggests will work, including fake.
* 2: All real non-fake methods.
* 3: All real methods.
* 4: All methods.
* Other values invoke undefined behaviour.
* @return The number of element that have been stored in `methods`, or should
* have been stored if the buffer was large enough.
*/
size_t libgamma_list_methods(int* restrict methods, size_t buf_size, int operation)
{
#ifdef HAVE_NO_LIBGAMMA_METHODS
(void) methods;
(void) buf_size;
(void) operation;
return 0;
#else
size_t n = 0;
$>for method in $(get-methods); do
#ifdef HAVE_LIBGAMMA_METHOD_${method}
if (libgamma_list_method_test(LIBGAMMA_METHOD_${method}, operation) && (n++ < buf_size))
methods[n - 1] = LIBGAMMA_METHOD_${method};
#endif
$>done
return n;
#endif
}
/**
* Check whether an adjustment method is available, non-existing (invalid) methods will be
* identified as not available under the rationale that the library may be out of date.
*
* @param method The adjustment method.
* @return Whether the adjustment method is available.
*/
int libgamma_is_method_available(int method)
{
#ifdef HAVE_NO_LIBGAMMA_METHODS
(void) method;
return 0;
#else
switch (method)
{
$>for method in $(get-methods); do
#ifdef HAVE_LIBGAMMA_METHOD_${method}
case LIBGAMMA_METHOD_${method}:
#endif
$>done
return 1;
default:
return 0;
}
#endif
}
/**
* Call the adjustment method's implementation of the called function.
*
* @param 1 The adjustment method, you may use `.` instead of `->` when resolving it.
* @param 2 `return` if the function returns a value, `break` otherwise.
* @param 3 The base name of the function to call, that is, the name of the function
* this is expended into without the libgamma namespace prefix.
* @param * The function's parameters.
*/
$<switch ()
$>{
/* Read out macro's parameters. */
$<method="${1//./->}"
ctrl=$2
fun=$3
shift 3
params="$*"
$>params="${params// /, }"
switch (${method})
{
$>for adjmethod in $(get-methods); do
#ifdef HAVE_LIBGAMMA_METHOD_${adjmethod}
case LIBGAMMA_METHOD_${adjmethod}:
/* Call the adjustment method's implementation, either
return or break after it depending on macro parameter's. */
$>[ $ctrl = return ] &&
return
libgamma_$(lowercase $adjmethod)_${fun}(${params});
$>[ ! $ctrl = return ] &&
break;
#endif
$>done
default:
/* If the adjustment method does not exists, either return
that error, or do nothing because the function this is
expanded into does return errors. */
$>if [ $ctrl = return ]; then
return LIBGAMMA_NO_SUCH_ADJUSTMENT_METHOD;
$>else
/* Method does not exists/excluded at compile-time.
We will assume that this is not done... */
break;
$>fi
}
$>}
/**
* 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)
{
memset(this, 0, sizeof(libgamma_method_capabilities_t));
$>switch method break method_capabilities this
}
/**
* Return the default site for 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* restrict var = libgamma_method_default_site_variable(method);
char* restrict env;
/* Return `NULL` there is not variable to read. */
if (var == NULL)
return NULL;
/* Read the variable. */
env = getenv(var);
/* Return `NULL` if it does not exist (or is empty). */
if ((env == NULL) || (*env == '\0'))
return NULL;
/* Return the variable's value. */
return env;
}
/**
* Return the default variable that determines
* the default site for 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)
{
switch (method)
{
#ifdef HAVE_LIBGAMMA_METHOD_X_RANDR
case LIBGAMMA_METHOD_X_RANDR:
return "DISPLAY";
#endif
#ifdef HAVE_LIBGAMMA_METHOD_X_VIDMODE
case LIBGAMMA_METHOD_X_VIDMODE:
return "DISPLAY";
#endif
default:
return NULL;
}
}
/**
* 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 allocated 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_site_initialise(libgamma_site_state_t* restrict this,
int method, char* restrict site)
{
this->method = method;
this->site = site;
$>switch method return site_initialise this site
}
/**
* Release all resources held by a site state.
*
* @param this The site state.
*/
void libgamma_site_destroy(libgamma_site_state_t* restrict this)
{
$>switch this.method break site_destroy this
free(this->site);
}
/**
* 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 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_site_restore(libgamma_site_state_t* restrict this)
{
$>switch this.method return site_restore this
}
/**
* 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 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)
{
this->site = site;
this->partition = partition;
$>switch site.method return partition_initialise this site partition
}
/**
* Release all resources held by a partition state.
*
* @param this The partition state.
*/
void libgamma_partition_destroy(libgamma_partition_state_t* restrict this)
{
$>switch this.site.method break partition_destroy this
}
/**
* 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 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_partition_restore(libgamma_partition_state_t* restrict this)
{
$>switch this.site.method return partition_restore this
}
/**
* 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 index of the CRTC within the partition.
* @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)
{
this->partition = partition;
this->crtc = crtc;
$>switch partition.site.method return crtc_initialise this partition crtc
}
/**
* Release all resources held by a CRTC state.
*
* @param this The CRTC state.
*/
void libgamma_crtc_destroy(libgamma_crtc_state_t* restrict this)
{
$>switch this.partition.site.method break crtc_destroy this
}
/**
* 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_crtc_state_t* restrict this)
{
$>switch this.partition.site.method return crtc_restore this
}
/**
* 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_get_crtc_information(libgamma_crtc_information_t* restrict this,
libgamma_crtc_state_t* restrict crtc, int32_t fields)
{
#ifdef HAVE_NO_LIBGAMMA_METHODS
(void) fields;
#endif
this->edid = NULL;
this->connector_name = NULL;
$>switch crtc.partition.site.method return get_crtc_information this crtc fields
}
/**
* Release all resources in an information data structure for a CRTC.
*
* @param this The CRTC information.
*/
void libgamma_crtc_information_destroy(libgamma_crtc_information_t* restrict this)
{
free(this->edid);
free(this->connector_name);
}
/**
* Release all resources in an information data structure for a CRTC
* and free the data structure pointer.
*
* @param this The CRTC information.
*/
void 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 hexadecimal representation.
*
* @param 1 Casing name.
* @param 2 The hexadecimal alphabet.
* @param edid The EDID in raw representation.
* @param length The length of `edid`.
* @return The EDID in hexadecimal representation,
* `NULL` on allocation error, `errno` will be set accordingly.
*/
$>behex_edid ()
$>{
char* libgamma_behex_edid_${1}(const unsigned char* restrict edid, size_t length)
{
char* restrict out;
size_t i;
/* Allocate memory area for the output string. */
if ((out = malloc((length * 2 + 1) * sizeof(char))) == NULL)
return NULL;
/* Translate from raw octets to hexadecimal. */
for (i = 0; i < length; i++)
{
out[i * 2 + 0] = "${2}"[(edid[i] >> 4) & 15];
out[i * 2 + 1] = "${2}"[(edid[i] >> 0) & 15];
}
/* NUL-terminate the output string. */
out[length * 2] = '\0';
return out;
}
$>}
/**
* 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`.
* @return The EDID in lowercase hexadecimal representation,
* `NULL` on allocation error, `errno` will be set accordingly.
*/
$>behex_edid lowercase 0123456789abcdef
/**
* 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`.
* @return The EDID in uppercase hexadecimal representation,
* NULL` on allocation error, `errno` will be set accordingly.
*/
$>behex_edid uppercase 0123456789ABCDEF
/**
* Convert an hexadecimal representation of an EDID to a raw representation.
*
* @param edid The EDID in hexadecimal representation.
* @return 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* restrict out;
size_t n = strlen(edid);
size_t i;
/* Check that the length of the strings is even,
otherwise it cannot represent bytes. */
if ((n & 1))
return errno = EINVAL, NULL;
/* Allocate memory area for output octet array. */
if ((out = malloc(n /= 2 * sizeof(unsigned char))) == NULL)
return NULL;
/* Convert to raw octet array. */
for (i = 0; i < n; i++)
{
/* Get the next character pair that, it represents an octet.o */
char a = edid[i * 2 + 0];
char b = edid[i * 2 + 1];
/* Verify that the input is in hexadecimal. */
if (is_not_hex(a) || is_not_hex(b))
{
free(out);
return errno = EINVAL, NULL;
}
/* Convert each chararacter to raw format. */
a = (char)((a & 15) + (a > '9' ? 9 : 0));
b = (char)((b & 15) + (b > '9' ? 9 : 0));
/* Combine the two characters into one octet. */
out[i] = (unsigned char)((a << 4) | b);
}
return out;
#undef is_hex
#undef not_range
}
/**
* 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.
* @return Zero on success, otherwise (negative) the value of an
* error identifier provided by this library.
*/
int libgamma_crtc_get_gamma_ramps16(libgamma_crtc_state_t* restrict this,
libgamma_gamma_ramps16_t* restrict ramps)
{
#ifdef HAVE_NO_LIBGAMMA_METHODS
(void) ramps;
#endif
switch (this->partition->site->method)
{
/* Methods other than Quartz/CoreGraphics uses 16-bit integers. */
$>for method in $(get-methods | grep -v QUARTZ_CORE_GRAPHICS); do
#ifdef HAVE_LIBGAMMA_METHOD_${method}
case LIBGAMMA_METHOD_${method}:
return libgamma_$(lowercase $method)_crtc_get_gamma_ramps16(this, ramps);
#endif
/* The Quartz/CoreGraphics method uses single precision float. */
$>done
#ifdef HAVE_LIBGAMMA_METHOD_QUARTZ_CORE_GRAPHICS
case LIBGAMMA_METHOD_QUARTZ_CORE_GRAPHICS:
{
libgamma_gamma_ramps_any_t ramps_;
ramps_.bits16 = *ramps;
return libgamma_translated_ramp_get(this, &ramps_, 16, -1,
libgamma_crtc_get_gamma_rampsf);
}
#endif
/* The selected method does not exist. */
default:
return LIBGAMMA_NO_SUCH_ADJUSTMENT_METHOD;
}
}
/**
* 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_crtc_set_gamma_ramps16(libgamma_crtc_state_t* restrict this,
libgamma_gamma_ramps16_t ramps)
{
#ifdef HAVE_NO_LIBGAMMA_METHODS
(void) ramps;
#endif
switch (this->partition->site->method)
{
/* Methods other than Quartz/CoreGraphics uses 16-bit integers. */
$>for method in $(get-methods | grep -v QUARTZ_CORE_GRAPHICS); do
#ifdef HAVE_LIBGAMMA_METHOD_${method}
case LIBGAMMA_METHOD_${method}:
return libgamma_$(lowercase $method)_crtc_set_gamma_ramps16(this, ramps);
#endif
$>done
/* The Quartz/CoreGraphics method uses single precision float. */
#ifdef HAVE_LIBGAMMA_METHOD_QUARTZ_CORE_GRAPHICS
case LIBGAMMA_METHOD_QUARTZ_CORE_GRAPHICS:
{
libgamma_gamma_ramps_any_t ramps_;
ramps_.bits16 = ramps;
return libgamma_translated_ramp_set(this, ramps_, 16, -1,
libgamma_crtc_set_gamma_rampsf);
}
#endif
/* The selected method does not exist. */
default:
return LIBGAMMA_NO_SUCH_ADJUSTMENT_METHOD;
}
}
/**
* Set or get the gamma ramps for a CRTC, non-16-bit gamma-depth version.
*
* @param 1 Either `get` or `set`, for the action that the name of value implies.
* @param 2 The `ramp*` pattern for the ramp structure and function to call.
* @param 3 Either of `bit8`, `bit16`, `bit32`, `bit64`, `float_single`, `float_double`;
* rather self-explanatory.
* @param 4 The number of bits in the gamma depth, -1 for single precision float,
* (`float`) and -2 for double percition float (`double`).
* @param this The CRTC state.
* @param ramps The gamma ramps to apply, or
* 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.
*/
$>crtc_set_get_gamma_ramps ()
$>{
$<
action=$1
ramps=$2
type=$3
bits=$4
p=
[ $action = get ] && p='*'
$>
int libgamma_crtc_${action}_gamma_${ramps}(libgamma_crtc_state_t* restrict this,
libgamma_gamma_${ramps}_t${p:+* restrict} ramps)
{
libgamma_gamma_ramps_any_t ramps_;
switch (this->partition->site->method)
{
/* The dummy method supports all ramp depths. */
#ifdef HAVE_LIBGAMMA_METHOD_DUMMY
case LIBGAMMA_METHOD_DUMMY:
return libgamma_dummy_crtc_${action}_gamma_${ramps}(this, ramps);
#endif
/* The Quartz/CoreGraphics method uses single precision float. */
#ifdef HAVE_LIBGAMMA_METHOD_QUARTZ_CORE_GRAPHICS
case LIBGAMMA_METHOD_QUARTZ_CORE_GRAPHICS:
$>if [ $bits = -1 ]; then
/* Single precision float is used. */
return libgamma_quartz_cg_crtc_${action}_gamma_${ramps}(this, ramps);
$>else
/* Something else is used and we convert to Single precision float. */
ramps_.${type} = ${p}ramps;
return libgamma_translated_ramp_${action}(this, ${p:+&}ramps_, ${bits}, -1,
libgamma_crtc_${action}_gamma_rampsf);
$>fi
#endif
/* Other methods use 16-bit integers. */
default:
ramps_.${type} = ${p}ramps;
return libgamma_translated_ramp_${action}(this, ${p:+&}ramps_, ${bits}, 16,
libgamma_crtc_${action}_gamma_ramps16);
}
}
$>}
/**
* Get the current gamma ramps for a CRTC, 8-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.
*/
$>crtc_set_get_gamma_ramps get ramps8 bits8 8
/**
* Set the gamma ramps for a CRTC, 32-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.
*/
$>crtc_set_get_gamma_ramps set ramps8 bits8 8
/**
* Get the current gamma ramps for a CRTC, 32-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.
*/
$>crtc_set_get_gamma_ramps get ramps32 bits32 32
/**
* Set the gamma ramps for a CRTC, 32-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.
*/
$>crtc_set_get_gamma_ramps set ramps32 bits32 32
/**
* Get the current gamma ramps for a CRTC, 64-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.
*/
$>crtc_set_get_gamma_ramps get ramps64 bits64 64
/**
* Set the gamma ramps for a CRTC, 64-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.
*/
$>crtc_set_get_gamma_ramps set ramps64 bits64 64
/**
* Get the current gamma ramps for a CRTC, `float` 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.
*/
$>crtc_set_get_gamma_ramps get rampsf float_single -1
/**
* Set the gamma ramps for a CRTC, `float` 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.
*/
$>crtc_set_get_gamma_ramps set rampsf float_single -1
/**
* Get the current gamma ramps for a CRTC, `double` 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.
*/
$>crtc_set_get_gamma_ramps get rampsd float_double -2
/**
* Set the gamma ramps for a CRTC, `double` 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.
*/
$>crtc_set_get_gamma_ramps set rampsd float_double -2
/**
* Set the gamma ramps for a CRTC.
*
* Note that this will probably involve the library allocating temporary data.
*
* @param 1 The data type for the ramp stop elements.
* @param 2 The `ramp*` pattern for the ramp structure and function to call.
* @param this The CRTC state.
* @param red_function The function that generates the gamma ramp for the red channel.
* @param green_function The function that generates the gamma ramp for the green channel.
* @param blue_function The function that generates the gamma ramp for the blue channel.
* @return Zero on success, otherwise (negative) the value of an
* error identifier provided by this library.
*/
$>crtc_set_gamma_ramps_f ()
$>{
int libgamma_crtc_set_gamma_${2}_f(libgamma_crtc_state_t* restrict this,
libgamma_gamma_${2}_fun* red_function,
libgamma_gamma_${2}_fun* green_function,
libgamma_gamma_${2}_fun* blue_function)
{
libgamma_crtc_information_t info;
libgamma_gamma_${2}_t ramps;
size_t i, n;
int e;
/* Get the size of the gamma ramps. */
if (libgamma_get_crtc_information(&info, this, LIBGAMMA_CRTC_INFO_GAMMA_SIZE))
{
if ((e = info.gamma_size_error) < 0)
return e;
return errno = e, LIBGAMMA_ERRNO_SET;
}
/* Copy the size of the gamma ramps and calculte the grand size. */
n = ramps. red_size = info. red_gamma_size;
n += ramps.green_size = info.green_gamma_size;
n += ramps. blue_size = info. blue_gamma_size;
/* Allocate gamma ramps. */
ramps. red = malloc(n * sizeof(${1}));
ramps.green = ramps. red + ramps. red_size;
ramps. blue = ramps.green + ramps.green_size;
if (ramps.red == NULL)
return LIBGAMMA_ERRNO_SET;
/* Generate the gamma ramp for the red chennel. */
for (i = 0, n = ramps.red_size; i < n; i++)
ramps.red[i] = red_function((float)i / (float)(n - 1));
/* Generate the gamma ramp for the green chennel. */
for (i = 0, n = ramps.green_size; i < n; i++)
ramps.green[i] = green_function((float)i / (float)(n - 1));
/* Generate the gamma ramp for the blue chennel. */
for (i = 0, n = ramps.blue_size; i < n; i++)
ramps.blue[i] = blue_function((float)i / (float)(n - 1));
/* Apply the gamma ramps. */
e = libgamma_crtc_set_gamma_${2}(this, ramps);
free(ramps.red);
return e;
}
$>}
/**
* Set the gamma ramps for a CRTC, 8-bit gamma-depth function version.
*
* Note that this will probably involve the library allocating temporary data.
*
* @param this The CRTC state.
* @param red_function The function that generates the gamma ramp for the red channel.
* @param green_function The function that generates the gamma ramp for the green channel.
* @param blue_function The function that generates the gamma ramp for the blue channel.
* @return Zero on success, otherwise (negative) the value of an
* error identifier provided by this library.
*/
$>crtc_set_gamma_ramps_f uint8_t ramps8
/**
* Set the gamma ramps for a CRTC, 16-bit gamma-depth function version.
*
* Note that this will probably involve the library allocating temporary data.
*
* @param this The CRTC state.
* @param red_function The function that generates the gamma ramp for the red channel.
* @param green_function The function that generates the gamma ramp for the green channel.
* @param blue_function The function that generates the gamma ramp for the blue channel.
* @return Zero on success, otherwise (negative) the value of an
* error identifier provided by this library.
*/
$>crtc_set_gamma_ramps_f uint16_t ramps16
/**
* Set the gamma ramps for a CRTC, 32-bit gamma-depth function version.
*
* Note that this will probably involve the library allocating temporary data.
*
* @param this The CRTC state.
* @param red_function The function that generates the gamma ramp for the red channel.
* @param green_function The function that generates the gamma ramp for the green channel.
* @param blue_function The function that generates the gamma ramp for the blue channel.
* @return Zero on success, otherwise (negative) the value of an
* error identifier provided by this library.
*/
$>crtc_set_gamma_ramps_f uint32_t ramps32
/**
* Set the gamma ramps for a CRTC, 64-bit gamma-depth function version.
*
* Note that this will probably involve the library allocating temporary data.
*
* @param this The CRTC state.
* @param red_function The function that generates the gamma ramp for the red channel.
* @param green_function The function that generates the gamma ramp for the green channel.
* @param blue_function The function that generates the gamma ramp for the blue channel.
* @return Zero on success, otherwise (negative) the value of an
* error identifier provided by this library.
*/
$>crtc_set_gamma_ramps_f uint64_t ramps64
/**
* Set the gamma ramps for a CRTC, `float` function version.
*
* Note that this will probably involve the library allocating temporary data.
*
* @param this The CRTC state.
* @param red_function The function that generates the gamma ramp for the red channel.
* @param green_function The function that generates the gamma ramp for the green channel.
* @param blue_function The function that generates the gamma ramp for the blue channel.
* @return Zero on success, otherwise (negative) the value of an
* error identifier provided by this library.
*/
$>crtc_set_gamma_ramps_f float rampsf
/**
* Set the gamma ramps for a CRTC, `double` function version.
*
* Note that this will probably involve the library allocating temporary data.
*
* @param this The CRTC state.
* @param red_function The function that generates the gamma ramp for the red channel.
* @param green_function The function that generates the gamma ramp for the green channel.
* @param blue_function The function that generates the gamma ramp for the blue channel.
* @return Zero on success, otherwise (negative) the value of an
* error identifier provided by this library.
*/
$>crtc_set_gamma_ramps_f double rampsd
#ifdef HAVE_NO_LIBGAMMA_METHODS
# ifdef __GCC__
# pragma GCC diagnostic pop
# endif
#endif
