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-rw-r--r--gamma-quartz-cg.c359
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diff --git a/gamma-quartz-cg.c b/gamma-quartz-cg.c
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+/* 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;
+}