diff options
| -rw-r--r-- | src/libgamma-facade.c | 132 | ||||
| -rw-r--r-- | src/libgamma-facade.h | 27 | ||||
| -rw-r--r-- | src/libgamma-method.h | 7 |
3 files changed, 160 insertions, 6 deletions
diff --git a/src/libgamma-facade.c b/src/libgamma-facade.c index 07dfd9b..81c6d8a 100644 --- a/src/libgamma-facade.c +++ b/src/libgamma-facade.c @@ -56,6 +56,7 @@ # endif #endif +#include <unistd.h> #include <stddef.h> #include <stdint.h> #include <stdlib.h> @@ -74,6 +75,137 @@ #endif + +#ifdef HAVE_GAMMA_METHODS +# ifdef HAVE_GAMMA_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; + + if (ttyname_r(fd, buf, sizeof(buf) / sizeof(char))) + return 0; + + if (strstr(buf, "/dev/tty") != buf) + return 0; + + 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_GAMMA_METHOD_LINUX_DRM + if (method == GAMMA_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_GAMMA_METHOD_DUMMY + if (method == GAMMA_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 `GAMMA_METHOD_COUNT` elements + * @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` + */ +size_t libgamma_list_methods(int* methods, int operation) +{ +#ifdef HAVE_NO_GAMMA_METHODS + (void) methods; + (void) operation; + return 0; +#else + size_t n = 0; + +#ifdef HAVE_GAMMA_METHOD_RANDR + if (libgamma_list_method_test(GAMMA_METHOD_RANDR, operation)) + methods[n++] = GAMMA_METHOD_RANDR; +#endif +#ifdef HAVE_GAMMA_METHOD_VIDMODE + if (libgamma_list_method_test(GAMMA_METHOD_VIDMODE, operation)) + methods[n++] = GAMMA_METHOD_VIDMODE; +#endif +#ifdef HAVE_GAMMA_METHOD_LINUX_DRM + if (libgamma_list_method_test(GAMMA_METHOD_LINUX_DRM, operation)) + methods[n++] = GAMMA_METHOD_LINUX_DRM; +#endif +#ifdef HAVE_GAMMA_METHOD_W32_GDI + if (libgamma_list_method_test(GAMMA_METHOD_W32_GDI, operation)) + methods[n++] = GAMMA_METHOD_W32_GDI; +#endif +#ifdef HAVE_GAMMA_METHOD_QUARTZ_CORE_GRAPHICS + if (libgamma_list_method_test(GAMMA_METHOD_QUARTZ_CORE_GRAPHICS, operation)) + methods[n++] = GAMMA_METHOD_QUARTZ_CORE_GRAPHICS; +#endif +#ifdef HAVE_GAMMA_METHOD_DUMMY + if (libgamma_list_method_test(GAMMA_METHOD_DUMMY, operation)) + methods[n++] = GAMMA_METHOD_DUMMY; +#endif + + return n; +#endif +} + + /** * Return the capabilities of an adjustment method * diff --git a/src/libgamma-facade.h b/src/libgamma-facade.h index a8e7636..19581a0 100644 --- a/src/libgamma-facade.h +++ b/src/libgamma-facade.h @@ -70,6 +70,21 @@ typedef double libgamma_gamma_rampsd_fun(double encoding); /** + * List available adjustment methods by their order of preference based on the environment + * + * @param methods Output array of methods, should be able to hold `GAMMA_METHOD_COUNT` elements + * @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` + */ +size_t libgamma_list_methods(int* methods, int operation); + +/** * Return the capabilities of an adjustment method * * @param this The data structure to fill with the method's capabilities @@ -303,7 +318,7 @@ int libgamma_crtc_get_gamma_ramps(libgamma_crtc_state_t* restrict this, * error identifier provided by this library */ int libgamma_crtc_set_gamma_ramps(libgamma_crtc_state_t* restrict this, - libgamma_gamma_ramps_t ramps); + libgamma_gamma_ramps_t ramps) __attribute__((hot)); /** @@ -411,7 +426,7 @@ int libgamma_crtc_set_gamma_rampsd(libgamma_crtc_state_t* restrict this, int libgamma_crtc_set_gamma_ramps_f(libgamma_crtc_state_t* restrict this, libgamma_gamma_ramps_fun* red_function, libgamma_gamma_ramps_fun* green_function, - libgamma_gamma_ramps_fun* blue_function); + libgamma_gamma_ramps_fun* blue_function) __attribute__((cold)); /** * Set the gamma ramps for a CRTC, 32-bit gamma-depth function version @@ -426,7 +441,7 @@ int libgamma_crtc_set_gamma_ramps_f(libgamma_crtc_state_t* restrict this, int libgamma_crtc_set_gamma_ramps32_f(libgamma_crtc_state_t* restrict this, libgamma_gamma_ramps32_fun* red_function, libgamma_gamma_ramps32_fun* green_function, - libgamma_gamma_ramps32_fun* blue_function); + libgamma_gamma_ramps32_fun* blue_function) __attribute__((cold)); /** * Set the gamma ramps for a CRTC, 64-bit gamma-depth function version @@ -441,7 +456,7 @@ int libgamma_crtc_set_gamma_ramps32_f(libgamma_crtc_state_t* restrict this, int libgamma_crtc_set_gamma_ramps64_f(libgamma_crtc_state_t* restrict this, libgamma_gamma_ramps64_fun* red_function, libgamma_gamma_ramps64_fun* green_function, - libgamma_gamma_ramps64_fun* blue_function); + libgamma_gamma_ramps64_fun* blue_function) __attribute__((cold)); /** * Set the gamma ramps for a CRTC, `float` function version @@ -456,7 +471,7 @@ int libgamma_crtc_set_gamma_ramps64_f(libgamma_crtc_state_t* restrict this, int libgamma_crtc_set_gamma_rampsf_f(libgamma_crtc_state_t* restrict this, libgamma_gamma_rampsf_fun* red_function, libgamma_gamma_rampsf_fun* green_function, - libgamma_gamma_rampsf_fun* blue_function); + libgamma_gamma_rampsf_fun* blue_function) __attribute__((cold)); /** * Set the gamma ramps for a CRTC, `double` function version @@ -471,7 +486,7 @@ int libgamma_crtc_set_gamma_rampsf_f(libgamma_crtc_state_t* restrict this, int libgamma_crtc_set_gamma_rampsd_f(libgamma_crtc_state_t* restrict this, libgamma_gamma_rampsd_fun* red_function, libgamma_gamma_rampsd_fun* green_function, - libgamma_gamma_rampsd_fun* blue_function); + libgamma_gamma_rampsd_fun* blue_function) __attribute__((cold)); #endif diff --git a/src/libgamma-method.h b/src/libgamma-method.h index 8b78e4e..e79e893 100644 --- a/src/libgamma-method.h +++ b/src/libgamma-method.h @@ -97,6 +97,13 @@ */ #define GAMMA_METHOD_MAX 5 +/** + * The number adjustment methods provided by this library. + * Note however that this includes adjstment methods that + * have been removed at compile-time. + */ +#define GAMMA_METHOD_COUNT (GAMMA_METHOD_MAX + 1) + /** |