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Diffstat (limited to 'gamma-quartz-cg.c')
| -rw-r--r-- | gamma-quartz-cg.c | 359 |
1 files changed, 359 insertions, 0 deletions
diff --git a/gamma-quartz-cg.c b/gamma-quartz-cg.c new file mode 100644 index 0000000..b0e3a29 --- /dev/null +++ b/gamma-quartz-cg.c @@ -0,0 +1,359 @@ +/* See LICENSE file for copyright and license details. */ +#ifndef HAVE_LIBGAMMA_METHOD_QUARTZ_CORE_GRAPHICS +# error Compiling gamma-quartz-cg.c without HAVE_LIBGAMMA_METHOD_QUARTZ_CORE_GRAPHICS +#endif + +#include "gamma-quartz-cg.h" + +#include "libgamma-error.h" + +#ifdef FAKE_LIBGAMMA_METHOD_QUARTZ_CORE_GRAPHICS +# include "fake-quartz-cg.h" +#else +# include <ApplicationServices/ApplicationServices.h> +# include <CoreGraphics/CGDirectDisplay.h> +# define close_fake_quartz_cg() /* For compatibility with "fake-quartz-cg.h" */ +#endif + +#include <stdlib.h> +#include <errno.h> + + +/** + * Return the capabilities of the adjustment method + * + * @param this The data structure to fill with the method's capabilities + */ +void +libgamma_quartz_cg_method_capabilities(libgamma_method_capabilities_t* restrict this) +{ + /* Gamma ramps size and depth can be queried */ + this->crtc_information = LIBGAMMA_CRTC_INFO_GAMMA_SIZE | LIBGAMMA_CRTC_INFO_GAMMA_DEPTH; + /* Quartz/CoreGraphics does not support sites or partitions */ + this->default_site_known = 1; + this->multiple_sites = 0; + this->multiple_partitions = 0; + /* Quartz/CoreGraphics does support CRTC:s */ + this->multiple_crtcs = 1; + /* Partitions are not supported... */ + this->partitions_are_graphics_cards = 0; + /* CoreGraphics have support for system restore */ + this->site_restore = 1; + this->partition_restore = 1; + /* But not for individual CRTC:s */ + this->crtc_restore = 0; + /* Gamma ramp sizes are identifical but not fixed */ + this->identical_gamma_sizes = 1; + this->fixed_gamma_size = 0; + /* Gamma ramp depths are fixed */ + this->fixed_gamma_depth = 1; + /* Quartz/CoreGraphics is a real adjustment method that can be faked */ +#ifdef FAKE_LIBGAMMA_METHOD_QUARTZ_CORE_GRAPHICS + /* It is considered real but fake if it is translated to X RandR */ + this->fake = 1; +# ifdef HAVE_LIBGAMMA_METHOD_X_RANDR + this->real = 1; +# else + this->real = 0; +# endif +#else + /* It is real and not fake if we are running on Mac OS X */ + this->fake = 0; + this->real = 1; +#endif + /* Gamma ramp adjustments are non-persistent */ + this->auto_restore = 1; +} + + +/** + * 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. 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 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_quartz_cg_site_initialise(libgamma_site_state_t *restrict this, char *restrict site) +{ + this->partitions_available = 1; + return site ? 0 : LIBGAMMA_NO_SUCH_SITE; +} + + +/** + * Release all resources held by a site state + * + * @param this The site state + */ +void +libgamma_quartz_cg_site_destroy(libgamma_site_state_t *restrict this) +{ + (void) this; + close_fake_quartz_cg(); +} + + +/** + * 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_quartz_cg_site_restore(libgamma_site_state_t *restrict this) +{ + (void) this; + CGDisplayRestoreColorSyncSettings(); + return 0; +} + + + +/** + * 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_quartz_cg_partition_initialise(libgamma_partition_state_t *restrict this, + libgamma_site_state_t *restrict site, size_t partition) +{ + CGDirectDisplayID *crtcs, *crtcs_old; + uint32_t cap = 4, n; + + (void) site; + + this->data = NULL; + + if (partition) + return LIBGAMMA_NO_SUCH_PARTITION; + + /* Allocate array of CRTC ID:s */ + crtcs = malloc((size_t)cap * sizeof(CGDirectDisplayID)); + if (!crtcs) + return LIBGAMMA_ERRNO_SET; + + /* It is not possible to ask CoreGraphics how many CRTC:s are + * available. We have to ask it to give us a ID:s of a number + * of CRTC:s and ask for more if we got as many as we asked for. */ + for (;;) { + /* Ask for CRTC ID:s */ + if (CGGetOnlineDisplayList(cap, crtcs, &n) != kCGErrorSuccess) + return free(crtcs), LIBGAMMA_LIST_CRTCS_FAILED; + /* If we did not get as many as we asked for then we have all */ + if (n < cap) + break; + /* Increase the number CRTC ID:s to ask for */ + if (cap > SIZE_MAX / 2) /* We could also test ~0, but it is still too many */ + return free(crtcs), LIBGAMMA_IMPOSSIBLE_AMOUNT; + cap <<= 1; + /* Grow the array of CRTC ID:s so that it can fit all we are asking for */ + crtcs = realloc(crtcs_old = crtcs, (size_t)cap * sizeof(CGDirectDisplayID)); + if (!crtcs) { + free(crtcs_old); + return LIBGAMMA_ERRNO_SET; + } + } + + /* Store CRTC ID:s and CRTC count */ + this->data = crtcs; + this->crtcs_available = (size_t)n; + return 0; +} + + +/** + * Release all resources held by a partition state + * + * @param this The partition state + */ +void +libgamma_quartz_cg_partition_destroy(libgamma_partition_state_t *restrict this) +{ + free(this->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_quartz_cg_partition_restore(libgamma_partition_state_t *restrict this) +{ + return libgamma_quartz_cg_site_restore(this->site); +} + + + +/** + * 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_quartz_cg_crtc_initialise(libgamma_crtc_state_t *restrict this, + libgamma_partition_state_t *restrict partition, size_t crtc) +{ + (void) this; + return crtc < partition->crtcs_available ? 0 : LIBGAMMA_NO_SUCH_CRTC; +} + + +/** + * Release all resources held by a CRTC state + * + * @param this The CRTC state + */ +void +libgamma_quartz_cg_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_quartz_cg_crtc_restore(libgamma_crtc_state_t *restrict this) +{ + (void) this; + errno = ENOTSUP; + return LIBGAMMA_ERRNO_SET; +} + + + +/** + * 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_quartz_cg_get_crtc_information(libgamma_crtc_information_t *restrict this, + libgamma_crtc_state_t *restrict crtc, int32_t fields) +{ +#define SUPPORTED_FIELDS (LIBGAMMA_CRTC_INFO_GAMMA_SIZE | LIBGAMMA_CRTC_INFO_GAMMA_DEPTH) +#define _E(FIELD) ((fields & FIELD) ? LIBGAMMA_CRTC_INFO_NOT_SUPPORTED : 0) + + CGDirectDisplayID *restrict crtcs; + size_t gamma_size; + + /* Quartz/CoreGraphics does not support EDID or monitor dimensions */ + this->edid_error = _E(LIBGAMMA_CRTC_INFO_EDID); + this->width_mm_error = _E(LIBGAMMA_CRTC_INFO_WIDTH_MM); + this->height_mm_error = _E(LIBGAMMA_CRTC_INFO_HEIGHT_MM); + this->width_mm_edid_error = _E(LIBGAMMA_CRTC_INFO_WIDTH_MM_EDID); + this->height_mm_edid_error = _E(LIBGAMMA_CRTC_INFO_HEIGHT_MM_EDID); + /* Quartz/CoreGraphics does support gamma ramp size query + The gamma ramps are identical but not fixed, and the query can fail */ + this->gamma_size_error = 0; + if ((fields & LIBGAMMA_CRTC_INFO_GAMMA_SIZE)) { + crtcs = crtc->partition->data; + gamma_size = CGDisplayGammaTableCapacity(crtcs[crtc->crtc]); + this->red_gamma_size = this->green_gamma_size = this->blue_gamma_size = (size_t)gamma_size; + this->gamma_size_error = gamma_size < 2 ? LIBGAMMA_SINGLETON_GAMMA_RAMP : 0; + } + /* Quartz/CoreGraphics uses `float` ramps */ + this->gamma_depth = -1; + this->gamma_depth_error = 0; + /* Quartz/CoreGraphics does not support gamma ramp support queries */ + this->gamma_support_error = _E(LIBGAMMA_CRTC_INFO_GAMMA_SUPPORT); + /* Quartz/CoreGraphics does not support EDID or connector information */ + this->subpixel_order_error = _E(LIBGAMMA_CRTC_INFO_SUBPIXEL_ORDER); + this->active_error = _E(LIBGAMMA_CRTC_INFO_ACTIVE); + this->connector_name_error = _E(LIBGAMMA_CRTC_INFO_CONNECTOR_NAME); + this->connector_type_error = _E(LIBGAMMA_CRTC_INFO_CONNECTOR_TYPE); + this->gamma_error = _E(LIBGAMMA_CRTC_INFO_GAMMA); + + /* We failed if gamma ramp size query failed or if an unsupport field was queried */ + return (this->gamma_size_error || (fields & ~SUPPORTED_FIELDS)) ? -1 : 0; + +#undef _E +#undef SUPPORTED_FIELDS +} + + +/** + * 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 + */ +int +libgamma_quartz_cg_crtc_get_gamma_rampsf(libgamma_crtc_state_t *restrict this, libgamma_gamma_rampsf_t *restrict ramps) +{ + CGDirectDisplayID *restrict crtcs = this->partition->data; + CGDirectDisplayID crtc_id = crtcs[this->crtc]; + uint32_t gamma_size_out; + CGError r; +#ifdef DEBUG + /* Gamma ramps sizes are identical but not fixed */ + if (ramps->red_size != ramps->green_size || ramps->red_size != ramps->blue_size) + return LIBGAMMA_MIXED_GAMMA_RAMP_SIZE; +#endif + /* Read current gamma ramps */ + r = CGGetDisplayTransferByTable(crtc_id, (uint32_t)ramps->red_size, ramps->red, ramps->green, ramps->blue, &gamma_size_out); + if (r != kCGErrorSuccess) + return LIBGAMMA_GAMMA_RAMP_READ_FAILED; + /* I hope that it will not actually ever change, + but it does return the the gamma ramp size despite + that it can be queried without querying for more */ + if (gamma_size_out != ramps->red_size) + return LIBGAMMA_GAMMA_RAMP_SIZE_CHANGED; + return 0; +} + + +/** + * 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 + */ +int +libgamma_quartz_cg_crtc_set_gamma_rampsf(libgamma_crtc_state_t *restrict this, libgamma_gamma_rampsf_t ramps) +{ + CGDirectDisplayID *restrict crtcs = this->partition->data; + CGDirectDisplayID crtc_id = crtcs[this->crtc]; + CGError r; +#ifdef DEBUG + /* Gamma ramps sizes are identical but not fixed */ + if (ramps.red_size != ramps.green_size || ramps.red_size != ramps.blue_size) + return LIBGAMMA_MIXED_GAMMA_RAMP_SIZE; +#endif + /* Apply gamma ramps */ + r = CGSetDisplayTransferByTable(crtc_id, (uint32_t)ramps.red_size, ramps.red, ramps.green, ramps.blue); + return r == kCGErrorSuccess ? 0 : LIBGAMMA_GAMMA_RAMP_WRITE_FAILED; +} |