/* -*- c -*- */ /* See LICENSE file for copyright and license details. */ #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 #include #include #include #include #include /* Some things to reduce warnings when we do * not have any adjustment methods enabled */ #ifndef HAVE_LIBGAMMA_METHODS # define HAVE_NO_LIBGAMMA_METHODS # ifdef __GNUC__ # 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], 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) 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; 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 */ ${ /* Read out macro's parameters */ $}" 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 */ $> if [ $ctrl = return ]; then return libgamma_$(lowercase $adjmethod)_${fun}(${params}); $> elif [ ! $ctrl = return ]; then break; $> fi #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) return NULL; /* Read the variable */ env = getenv(var); /* Return `NULL` if it does not exist (or is empty) */ if (!env || !*env) 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. Once 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 */ out = malloc((length * 2 + 1) * sizeof(char)); if (!out) 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 i, n = strlen(edid); char a, b; /* Check that the length of the strings is even, * otherwise it cannot represent bytes */ if (n & 1) { errno = EINVAL; return NULL; } /* Allocate memory area for output octet array */ n /= 2 * sizeof(unsigned char); out = malloc(n); if (!out) return NULL; /* Convert to raw octet array */ for (i = 0; i < n; i++) { /* Get the next character pair that, it represents an octet. */ a = edid[i * 2 + 0]; b = edid[i * 2 + 1]; /* Verify that the input is in hexadecimal */ if (is_not_hex(a) || is_not_hex(b)) { free(out); errno = EINVAL; return 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) { libgamma_gamma_ramps_any_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_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: 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) { libgamma_gamma_ramps_any_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: 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 () $>{ $ 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)) { e = info.gamma_size_error; if (e < 0) return e; errno = e; return 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(${1})); ramps.green = &ramps. red[ramps. red_size]; ramps. blue = &ramps.green[ramps.green_size]; if (!ramps.red) return LIBGAMMA_ERRNO_SET; /* Generate the gamma ramp for the red chennel */ for (i = 0, n = ramps.red_size; i < n; i++) ramps.red[i] = red_function((float)i / (float)(n - 1)); /* Generate the gamma ramp for the green chennel */ for (i = 0, n = ramps.green_size; i < n; i++) ramps.green[i] = green_function((float)i / (float)(n - 1)); /* Generate the gamma ramp for the blue chennel */ for (i = 0, n = ramps.blue_size; i < n; i++) ramps.blue[i] = blue_function((float)i / (float)(n - 1)); /* Apply the gamma ramps */ e = libgamma_crtc_set_gamma_${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 __GNUC__ # pragma GCC diagnostic pop # endif #endif